CN116481598A - Insulating gas non-electric parameter on-line monitoring device - Google Patents

Abstract

The invention provides an on-line monitoring device for non-electrical parameters of insulating gas. The device comprises: a connection interface; a density relay body, on which a mechanical dial is arranged; a pointer displacement sensor for obtaining density data of insulating gas; a gas circulation chamber for diverting the insulating gas into the gas circulation chamber; The invention obtains the density data of the insulating gas through the pointer displacement sensor; through the online monitoring of the insulating gas in the gas circulation chamber through the data acquisition module, the temperature and pressure data of the insulating gas, the micro-water data of the insulating gas, the composition and composition content data of the decomposition products of the insulating gas are obtained, and the integration of multi-parameters of the insulating gas and the online monitoring of the density relay is realized.

Description

An on-line monitoring device for non-electrical parameters of insulating gas

technical field

The invention relates to the technical field of operation and maintenance of power transmission and transformation equipment, in particular to an on-line monitoring device for non-electric parameters of insulating gas.

Background technique

At present, gas-insulated power equipment such as GIS switches, post insulators, bushings and composite cross-arm insulators for lines are used in substations or converter stations. The internal insulation strength is improved by filling SF6, N2, mixed gases and environmental gases and other insulating gases inside to ensure safe operation and insulation.

The long-term outdoor operation of gas-insulated electrical equipment is greatly affected by the environment such as large temperature difference and strong wind. The low-frequency vibration under long-term electrified operation has a greater impact on the crimping joint. There may be a possibility of gas leakage and a decrease in insulation strength. It is necessary to monitor the density of the insulating gas in real time, give early warning of leakage, and find out the leak point in time and perform maintenance.

According to the voltage level and function of power equipment, the density of insulating gas filled inside is different, and the liquefaction temperature of insulating gas with different densities is different. Once the temperature drops to the liquefaction temperature of insulating gas, the insulation performance will be greatly reduced. It is necessary to monitor the temperature of insulating gas and carry out heat preservation and gas replenishment to avoid insulation problems caused by too low temperature.

The environment will also have a great impact on the micro-water content of the insulating gas. When the equipment is powered on or the ambient temperature rises, the average kinetic energy of the water molecules in the equipment will increase, which will cause the water molecules attached to the wall and the surface of the insulating part to be released again, resulting in an increase in the number of water molecules in the insulating gas, so the micro-water value will increase accordingly. Although the pressure of SF6 gas in the circuit breaker is higher than the external air pressure, because the water content of the gas inside the circuit breaker is low, and the external water pressure is more than 100 times higher than that inside the circuit breaker, the penetration of water molecules is extremely strong. Once there is a small leak in the gas chamber, under the action of the huge pressure difference between the inside and outside, the moisture in the atmosphere will gradually penetrate into the insulating gas through the seal, resulting in the rise of micro water, which directly affects the insulation performance.

If a discharge occurs inside the gas-insulated electrical equipment, SF6 decomposition gas will be generated. The decomposition gas includes SO2, H2S and fluoride. Different decomposition products can represent different fault characteristics. The concentration of the decomposition products also has a great impact on the insulation performance of the insulating gas. The monitoring of SF6 decomposition products is of great significance to the fault judgment and operation status evaluation of electrical equipment.

To sum up, in order to avoid failures such as air leakage, gas liquefaction, excessive micro water and discharge of gas-insulated electrical equipment, real-time monitoring of non-electrical parameters such as insulating gas density, temperature, micro water and decomposition products is required.

In the prior art, a density relay is used to monitor the density of the insulating gas. The density relay is a mechanical instrument with a dial. The temperature correction of SF6 is carried out through a sealed SF6 expansion tube inside, and the pressure of SF6 can be corrected to 20°C. P20 is used to represent the density of the insulating gas. The pressure data can be read through the dial, and it also has a relay signal for signal transmission such as early warning and blocking after gas leakage. For GIS busbar, inflatable bushing and other equipment, the early warning signal is connected, and the early warning is carried out when the pressure drops below the early warning pressure; for the gas switch, circuit breaker and other equipment, the early warning, single blocking or double blocking signal is connected, and the blocking operation is carried out when the pressure drops to the blocking pressure.

At present, most outdoor gas-insulated equipment uses density relays for gas state monitoring, and operation and maintenance personnel record meter data in each operation and maintenance cycle. Some indoor gas-insulated equipment with a voltage level of 110kV and below also use SF6 leakage monitoring devices to monitor the SF6 leakage of the equipment. The SF6 gas leakage in the equipment room is detected through the SF6 transmitter probe. If there is a gas leakage, an audible and visual alarm will be given at the door of the equipment room. Early warning to prevent personnel from entering the SF6 leaking equipment room and causing suffocation.

The monitoring parameters of a mechanical instrument such as a density relay are single, and the data needs to be manually recorded, which requires a large workload.

Contents of the invention

In view of this, the present invention proposes an on-line monitoring device for non-electric parameters of insulating gas, aiming at solving the problem of single monitoring quantity of existing density relays and heavy workload due to manual data recording.

The present invention proposes an on-line monitoring device for non-electric parameters of insulating gas. The on-line monitoring device for non-electric parameters of insulating gas comprises: a connection interface, which is provided with a gas passage inside, and the connection interface is used to connect the gas chamber gas port of the gas-insulated power equipment, so that the insulating gas in the gas-insulated power equipment flows into the gas passage; the density relay body is provided with a density detection passage inside, and the density detection passage is connected with the gas passage for detecting and displaying the density of the insulating gas in the density detection passage; It is used to display the density of the insulating gas; the pointer displacement sensor is set on the mechanical dial, which is used to use the principle of measuring the displacement of the pointer and zero value, and the pointer displacement corresponds to the dial scale, so as to realize the electronic display value of the mechanical meter and obtain the density data of the insulating gas; the gas circulation chamber, which is connected with the gas passage, is used to guide the insulating gas into the gas circulation chamber, and then guide the insulating gas into the gas circulation chamber after flowing along the gas circulation chamber. Monitoring, to obtain the temperature and pressure data of the insulating gas, the composition and composition content data of the decomposition products of the insulating gas, and the moisture data of the insulating gas.

Further, the above-mentioned insulating gas non-electric parameter online monitoring device, the data acquisition module includes: a temperature and pressure sensor, arranged upstream of the gas circulation chamber, for detecting the temperature and pressure of the insulating gas in the gas circulation chamber, obtaining the temperature data and pressure data of the insulating gas, and based on the temperature data and pressure data of the insulating gas, determining the insulating gas pressure data corrected to 20°C; Between the pressure sensor and the decomposition sensor, it is used to monitor the micro-water of the insulating gas and obtain the micro-water data of the insulating gas.

Further, the above-mentioned insulating gas non-electric parameter online monitoring device also includes: a self-check module, which is connected to the pointer displacement sensor and the temperature and pressure sensor respectively, and is used to receive the density data of the insulating gas and the pressure data of the insulating gas at 20°C, and perform density data self-checking based on the density data of the insulating gas and the pressure data of the insulating gas at 20°C.

Further, the above-mentioned insulating gas non-electric parameter online monitoring device performs density data self-inspection based on the insulating gas density data and the insulating gas pressure data at 20°C, including: determining the difference Δρ between the two based on the insulating gas density data and the insulating gas pressure data at 20°C, and determining the density processing type based on the difference; determining the density control strategy based on the density processing type, and performing self-check adjustments based on the density control strategy.

Further, the above-mentioned insulating gas non-electric parameter online monitoring device determines the density processing type based on the difference, including: setting the first preset difference Δρ1 and the second preset difference Δρ2, and 0<Δρ1<△ρ2; when △ρ1≤|△ρ|<△ρ2, determine the early warning type as data deviation early warning; when |△ρ|≥△ρ2, determine the early warning type as data error early warning.

Further, the above-mentioned insulating gas non-electric parameter online monitoring device determines the density control strategy based on the density processing type, including: when the early warning type is data deviation early warning, the control strategy is to correct the pointer displacement sensor based on the insulating gas pressure data at 20°C; when the early warning type is data error early warning, the control strategy is to replace the density relay body.

Further, the above-mentioned insulating gas non-electric parameter online monitoring device also includes: a data integration module, which is connected to the data acquisition module, and is used to receive density data, temperature data, insulating gas pressure data at 20°C, composition and composition content data of decomposition products, and micro-water data; an early warning type determination module is connected to the collection module, and is used to determine the warning type based on the density data, temperature data, insulation gas pressure data at 20°C, composition and composition content data of decomposition products, and micro-water data; the control module is used to determine the control strategy associated with the early warning type, The gas insulated power equipment is controlled based on the control strategy.

Further, the above-mentioned insulating gas non-electric parameter online monitoring device determines the type of warning based on density data, temperature data, insulating gas pressure data at 20°C, composition and composition content data of decomposition products, and micro-water data, including: when it is determined that the solid insulation is eroded based on preset erosion rules, the early warning type is determined as fixed insulation corrosion early warning; The rule is: when it is determined that the component content of CS2 continues to increase within the first preset time period based on the composition and component content data of the decomposition product, and when the component content of CS2 is greater than the first preset content, it is determined that the fixed insulation is eroded; the preset overheating rule is: when the component content of SO2 is determined to be greater than the second preset content, the component content of H2S is greater than the third preset content, and the temperature is greater than the preset temperature value based on the composition and component content data of the decomposition product. When the component content of 2 is greater than the fourth preset content, the component content of H2S is greater than the fifth preset content, the component content of C3F8 is greater than the sixth preset content, and CO2, it is determined that a discharge fault occurs; the second preset content is less than the fourth preset content, and the third preset content is less than the fifth preset content.

Further, the above-mentioned insulating gas non-electric parameter online monitoring device determines the control strategy associated with the early warning type, including: when the early warning type is fixed insulation erosion warning, the control strategy is to power off and repair the internal insulation condition of the equipment; when the early warning type is overheat fault early warning, the control strategy is to power off and find overheat fault points, and process overheat fault points to eliminate overheat faults; when the early warning type is discharge fault early warning, the control strategy is to find discharge points and process the discharge points to eliminate discharge faults.

Further, in the above-mentioned online monitoring device for non-electrical parameters of insulating gas, a drainage fan is provided in the gas circulation chamber to drain the insulating gas, so that after the insulating gas is discharged from the gas passage, it flows from upstream to downstream along the gas circulation chamber, and circulates back into the gas passage; the gas circulation chamber is also provided with an air release port for discharging air.

The on-line monitoring device for non-electric parameters of insulating gas provided by the present invention realizes the connection between the device and the gas-insulated power equipment through the connection interface, and realizes the extraction of gas to realize the online monitoring of the insulating gas; the density of the insulating gas is displayed through the density relay body, and the density data of the insulating gas is obtained through the pointer displacement sensor; On-line monitoring is carried out to obtain the temperature and pressure data of the insulating gas, the micro-water data of the insulating gas, the composition and component content data of the decomposition products of the insulating gas, and realize the integration of multi-parameters of the insulating gas and the online monitoring of the density relay, which can realize the multi-parameter monitoring of the insulating gas including density, temperature, pressure, micro-water and decomposition products, and solve the problem of a single monitoring amount of the existing density relay and a large workload that requires manual data recording. The device also has the following advantages:

(1) Without changing the original gas circuit interface and electrical wiring, the insulation multi-parameter on-line monitoring and gas density relay are integrated, realizing that the device has both relay function and multi-parameter on-line monitoring function.

(2) The non-electrical monitoring parameters of insulating gas include density, temperature, pressure, micro-water and decomposition products. The monitoring quantities are complete and diverse, and reflect the operating status of insulating gas in multiple dimensions.

(3) Using the pointer displacement sensor to sense the change of density data, the reading data of the mechanical part and the electronic part are completely consistent, and the complete correspondence between the mechanical signal and the electronic signal is realized. At the same time, a temperature and pressure sensor is set to sense the temperature and pressure of the insulating gas, and P20 is obtained by using the SF6 temperature and pressure formula. The two sets of data can be compared and self-checked. At the same time, temperature monitoring can provide basic data for liquefaction early warning; among them, P20 is the pressure value of the insulating gas corrected to 20 °C.

(4) The design of the air circuit unit is reasonable and ingenious. The distribution design of the sensors can realize accurate and reliable sensing of various parameters. The pointer displacement sensor is located near the pointer of the dial, which can fully reflect the change of pointer displacement. The temperature and pressure sensor is located near the air inlet, which can most directly reflect the atmospheric room temperature and pressure.

(5) The device uses a wireless communication module to communicate with the host, and the power supply for the remote transmission part can be provided by a power conversion module or a high-power battery without changing the original wiring method. For example, replacing the existing density relay meter in the station, there is no cumbersome wiring, which is convenient and quick.

Description of drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiment. The drawings are only for the purpose of illustrating a preferred embodiment and are not to be considered as limiting the invention. Also throughout the drawings, the same reference numerals are used to designate the same parts. In the attached picture:

Fig. 1 is a schematic structural diagram of an on-line monitoring device for non-electric parameters of insulating gas provided by an embodiment of the present invention;

Fig. 2 is a structural block diagram of an on-line monitoring device for non-electric parameters of insulating gas provided by an embodiment of the present invention;

Fig. 3 is a structural block diagram of a data acquisition module provided by an embodiment of the present invention.

Detailed ways

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

Referring to Fig. 1 and Fig. 2, it shows a preferred structure of an on-line monitoring device for non-electric parameters of insulating gas provided by an embodiment of the present invention. As shown in the figure, the device includes: a connection interface 1, a density relay body 2, a pointer displacement sensor 3, a gas circulation chamber 4, a data acquisition module 5, a junction box 6, a self-test module 7, a data integration module 8, an early warning type determination module 9, and a control module 10;

A gas passage 11 is provided inside the connection interface 1 , and the connection interface 1 is used to connect the gas chamber gas port of the gas-insulated power equipment (not shown in the figure), so that the insulating gas in the gas-insulated power equipment flows into the gas passage 11 . Specifically, the connection interface 1 can be connected to the gas chamber gas port of the on-site GIS of the power station, the inflatable bushing, and other gas-insulated power equipment; wherein, the connection interface 1 can be an external wire structure, and its external thread size can be M20*1.5 or G1/2 according to the general connection on site; wherein, the pitch of M20*1.5 is 1.5mm, the thread diameter is 20mm, G1/2 is 14 threads per inch, and the thread pitch is 1.814mm. A gas passage 11 is provided inside the connection interface 1, and the gas passage 11 is connected with the gas passage of the gas-insulated power equipment, so that the insulating gas in the gas-insulated power equipment can flow into the gas passage 11 for on-line monitoring. The device can also be provided with a housing on which the connection interface 1 is arranged. Among them, the insulating gas is SF6. Of course, the device can be used for on-line monitoring of SF6 insulating gas, as well as environmental gases such as N2, mixed gas and C4. That is to say, it is not only suitable for SF6 insulating gas, but also can be used for online monitoring of other gases.

A density detection channel 21 is provided inside the density relay body 2, and the density detection channel 21 is connected to the gas channel 11 for detecting and displaying the density of the insulating gas in the density detection channel 21; the density relay body 2 is provided with a mechanical dial 22, and the mechanical dial 22 is provided with a scale and a pointer 23 for displaying the density of the insulating gas. Specifically, the density relay body 2 can be an SF6 density relay, which is provided with a density detection channel 21, a mechanical dial 22 and a relay unit 24. The density detection channel 21 is connected to the gas channel 11 to detect the density of the insulating gas and display the density through the mechanical dial 22. Wherein, the mechanical dial 22 is arranged on the housing, and the relay unit 24 is used for early warning, blocking, and switching on and off of signals based on the density of the insulating gas.

The pointer displacement sensor 3 is arranged on the mechanical dial 22, and is used to use the principle of measuring the displacement of the pointer 23 and the zero value to correspond the displacement of the pointer 23 to the scale of the dial, realize the electronic display of the mechanical meter, and obtain the density data of the insulating gas. Specifically, the pointer displacement sensor 3 is installed on the mechanical dial 22, adopts the principle of measuring the displacement of the pointer and zero value, corresponds the pointer displacement to the dial scale, realizes the digitalization of the indication value of the mechanical meter, and obtains the density data of the insulating gas. Wherein, the pointer displacement sensor 3 may be a magnetic steel angle sensor.

The gas circulation chamber 4 communicates with the gas passage 11, and is used to divert the insulating gas into the gas circulation chamber 4, and flow along the gas circulation chamber 4 to the gas passage 11 to flow out into the gas-insulated power equipment, so as to realize the circulation flow of the insulating gas. Specifically, the gas circulation chamber 4 is provided with an air inlet and an air outlet, both of which are connected to the gas passage 11; the insulating gas in the gas-insulated power equipment flows from the gas passage 11, through the air inlet, into the gas circulation chamber 4, and flows from upstream to downstream along the gas circulation chamber 4, and flows back into the gas passage 11 from the air outlet, and flows back into the gas-insulated power equipment along the gas passage 11, forming a gas circulation passage; the air inlet and the air outlet can be connected. Wherein, the direction of the dotted arrow in FIG. 1 refers to the flow direction of the insulating gas. Wherein, the gas circulation chamber 4, the gas channel 11 and the density detection channel 21 are combined to form an integral gas circuit unit to realize gas circulation. In this embodiment, as shown in FIG. 1 , a drainage fan 41 is provided in the gas circulation chamber 4 to drain the insulating gas, so that the insulating gas flows from upstream to downstream along the gas circulation chamber 4 after being discharged from the gas passage 11 , and circulates back into the gas passage 11 , so that the insulating gas flows from upstream to downstream in the gas circulation chamber 4 . Wherein, there can be two drainage fans 41, which are an air inlet fan and an air outlet fan respectively. The air inlet fan is arranged upstream, and the air outlet fan is arranged at the air outlet; the air circulation chamber 4 is also provided with an air outlet 42, which is used to discharge air, remove the air in the air circuit unit, and better monitor the non-electric parameters of the insulating gas. Among them, the non-electrical parameters may include density, temperature and pressure, moisture content, and components of decomposition products.

The data acquisition module 5 is used for on-line monitoring of the insulating gas in the gas circulation chamber 4, and obtains temperature and pressure data of the insulating gas, micro-water data of the insulating gas, composition and composition content data of decomposition products of the insulating gas. Specifically, along the flow direction of the insulating gas in the gas circulation chamber, the data acquisition module 5 sequentially collects the temperature and pressure of the insulating gas, the micro-water collection, and the composition of the decomposition products, so as to sequentially obtain the temperature and pressure data of the insulating gas, the micro-water data of the insulating gas, and the composition and component content data of the decomposition products of the insulating gas.

The junction box 6 is arranged on the housing, which is connected to the density relay body 2 and can be connected to the relay unit 24 . Specifically, the junction box 6 is provided with a terminal 61, which is a seven-core terminal, which can be effectively adapted to the density relay currently used in the station.

The self-inspection module 7 is connected with the pointer displacement sensor 3 and the data acquisition module 5, and is used to receive the density data of the insulating gas acquired by the pointer displacement sensor 3 and the temperature and pressure data of the insulating gas collected by the data acquisition module 5, and perform self-inspection of the density data based on the density data of the insulating gas and the temperature and pressure data of the insulating gas. Specifically, the self-inspection module 7 can determine the insulating gas pressure data corrected to 20°C based on the temperature and pressure data of the insulating gas. The insulating gas density data displayed on the mechanical dial 22 is also the insulating gas pressure data at 20°C. Therefore, the insulating gas density data obtained by the pointer displacement sensor 3 is also the insulating gas pressure data at 20°C. Perform self-test calibration.

The data integration module 8 is connected with the data acquisition module 5, and is used to receive density data, temperature data, insulating gas pressure data at 20°C, composition and composition content data of decomposition products, and micro-water data.

The early warning type determination module 9 is connected with the data integration module 8, and is used to determine the early warning type based on density data, temperature data, insulating gas pressure data at 20°C, decomposition product composition and composition content data, and micro-water data. Specifically, based on density data, temperature data, insulating gas pressure data at 20°C, composition and composition content data of decomposition products, and micro-water data, the type of early warning is determined, including:

When it is determined that the solid insulation is eroded based on the preset erosion rules, the early warning type is determined as a fixed insulation eroded early warning;

When it is determined based on the preset overheating rule that an overheating fault occurs, the early warning type is determined to be an overheating fault early warning;

When it is determined based on the preset discharge rules that a discharge fault occurs, the early warning type is determined to be a discharge fault early warning;

Wherein, the preset erosion rule is: when it is determined based on the composition and composition content data of the decomposed product that the composition content of CS2 continues to increase within the first preset time period, and the composition content of CS2 is greater than the first preset content, it is determined that the fixed insulation is eroded;

The preset overheating rule is: when it is determined based on the composition of the decomposed product, the composition content data, and the temperature data that the composition content of SO2 is greater than the second preset content, the composition content of H2S is greater than the third preset content, and the temperature is greater than the preset temperature value, it is determined that an overheating fault occurs;

The preset discharge rule is: when it is determined based on the composition and composition content data of the decomposition product that the composition content of SO2 is greater than the fourth preset content, the composition content of H2S is greater than the fifth preset content, the composition content of C3F8 is greater than the sixth preset content, and CO2, it is determined that a discharge fault occurs;

The second preset content is smaller than the fourth preset content, and the third preset content is smaller than the fifth preset content.

Of course, based on density data, temperature data, insulating gas pressure data at 20°C, composition and composition content data of decomposition products, and micro-water data, the type of early warning can be determined, and it can also include:

If it is determined that there is a slow leak based on the first preset leak rule, then determine that the warning type is a slow leak warning;

If it is determined based on the second preset leakage rule that there is a low-density leakage, the early warning type is determined to be a low-density early warning;

If it is determined based on the temperature data that the temperature continues to rise within a preset period of time, then the type of early warning is determined to be a temperature continuous rise warning;

If it is determined based on the temperature data that the temperature continues to rise, and it is determined based on the moisture content that there is no gas leakage, then when the moisture content rises to a preset threshold value of the moisture content of the first preset percentage, the early warning type is determined as a moisture excess warning;

If it is determined based on the temperature data that the temperature continues to rise, and it is determined that there is no gas leakage based on the micro-water content, then when the micro-water content rises to the preset micro-water content threshold, the early warning type is determined to be a micro-water exceeding the standard alarm;

If it is determined based on the temperature data that the temperature continues to rise, and it is determined that there is a gas leak based on the micro-water content, then the type of early warning is determined to be a comprehensive warning of leakage and micro-water exceeding the standard;

If it is determined based on the temperature data that the temperature continues to drop, then the early warning type is determined as a temperature continuous drop warning;

If it is determined based on the temperature data that the temperature continues to drop, and it is determined based on the first preset leak rule or the second preset leak rule that there is no leak, then when the temperature drops to the first preset percentage of the liquefaction temperature threshold, the early warning type is determined to be a liquefaction early warning;

If it is determined based on the temperature data that the temperature continues to drop, and it is determined based on the first preset leak rule or the second preset leak rule that there is no leak, then when the temperature drops to the liquefaction temperature threshold, the early warning type is determined to be a liquefaction alarm;

If it is determined based on the temperature data that the temperature continues to drop, and it is determined based on the first preset leak rule or the second preset leak rule that there is a gas leak, then if the temperature does not reach the liquefaction temperature, determine that the early warning type is a leak early warning;

If it is determined based on the temperature data that the temperature continues to drop, and it is determined based on the first preset leak rule or the second preset leak rule that there is a gas leak, then if the temperature reaches the liquefaction temperature, determine that the early warning type is a comprehensive early warning of liquefaction and leakage;

Among them, the first preset leakage rule includes: if it is determined based on the gas density data that the density continues to decrease within the first preset time period, and the drop value is greater than the preset density drop threshold of the first preset percentage and less than the preset density drop threshold, then determine the early warning type as a slow leak early warning; if it is determined based on the gas density data that the density continues to decrease within the first preset time period, and the drop value is greater than the preset density drop threshold, then determine that the early warning type is a slow leak alarm;

The second preset leakage rule includes: if it is determined based on the gas density data that the current density is lower than the preset warning density threshold of the first preset percentage, then determining that the alarm type is a low density warning; if it is determined based on the gas density that the current density is lower than the preset warning density threshold, then determining that the warning type is a low density warning.

In this embodiment, when determining whether there is a gas leak based on the micro-water content, the obtained micro-water content data is compared with the relationship curve of the micro-water content with temperature in the case of no leakage to determine whether there is a gas leak; determine the density interval where the obtained insulating gas density data is located, and determine the temperature interval corresponding to the density interval based on the correspondence between the density and the liquefaction temperature, and determine the liquefaction temperature threshold based on the maximum value in the temperature interval.

The control module 10 is connected with the early warning type determination module 9, and is used for determining a control strategy associated with the early warning type, so as to control the gas-insulated power equipment based on the control strategy. Specifically, determine the control strategy associated with the early warning type, including:

When the warning type is fixed insulation erosion warning, the control strategy is to cut off the power and check the internal insulation condition of the equipment;

When the warning type is overheating fault warning, the control strategy is to cut off the power and find the overheating fault point, and process the overheating fault point to eliminate the overheating fault;

When the early warning type is discharge fault early warning, the control strategy is to find the discharge point and process the discharge point to eliminate the discharge fault.

Determine the control strategy associated with the alert type, which may also include:

When the early warning type is a slow leak alarm or a low density alarm, the control strategy is to find the leak point and perform air replenishment operations on the equipment;

When the warning types are continuous temperature rise warning and micro water exceeding the standard warning, the control strategy is to cool down the equipment;

When the early warning type is a comprehensive early warning of leakage and micro-water exceeding the standard, the control strategy is to cool down the equipment and find the leak point, and perform air replenishment operation on the equipment;

When the warning type is continuous temperature drop warning and liquefaction warning, the control strategy is to heat up the equipment;

When the early warning type is leakage early warning, the control strategy is to find the air leakage point and perform air replenishment operation on the equipment;

When the early warning type is comprehensive early warning of liquefaction and leakage, the control strategy is to raise the temperature of the equipment and find the leak point at the same time, and perform air replenishment operation on the equipment.

Continuing to refer to Fig. 1 and Fig. 3, in this embodiment, the data acquisition module 5 includes: a temperature and pressure sensor 51, a micro-water sensor 52, and a decomposition product sensor 53; wherein, the temperature and pressure sensor 51 is arranged upstream of the gas circulation chamber 4 to detect the temperature and pressure of the insulating gas in the gas circulation chamber, obtain the temperature data and pressure data of the insulating gas, and determine the pressure data of the insulating gas corrected to 20° C. based on the temperature data and pressure data of the insulating gas; the decomposition product sensor 53 is arranged on the downstream of the gas circulation chamber 4 and is used to monitor the insulating gas Monitor the decomposition products of the insulating gas to obtain the composition and component content data of the decomposition products of the insulating gas; the micro-water sensor 52 is set between the temperature and pressure sensor 51 and the decomposition product sensor 53 to monitor the micro-water of the insulating gas and obtain the micro-water data of the insulating gas. Specifically, the temperature and pressure sensor 51 uses piezoresistance and thermistor principles to measure the pressure and temperature of the insulating gas, that is, SF6. The micro-water sensor 52 can be a humidity sensor, which uses a contact film to absorb water molecules to monitor micro-water. In this embodiment, the decomposition product sensor 53 may include several groups of sensor bodies. As shown in FIG. 1 , it may be two groups of sensor bodies. Each sensor body includes a light source emitter 531, a filter 532, and a light source receiver 533. The sensor body adopts the principle of spectroscopy. By changing the filter 532, the corresponding waveband beams of different insulating gas decomposition products (such as H2S, SO2, etc.) can be obtained. The filter 532 can be divided into two groups, namely A and A' or B and B'. The concentration of the decomposition product is monitored by measuring the absorption ability of the decomposition product of the insulating gas to the beam of a specific waveband. In this embodiment, after the insulating gas enters the gas circulation chamber 4 from the air inlet, it first passes through the temperature and pressure sensor 51, and then passes through the micro-water sensor 52, then passes through the decomposition product sensor 53, and circulates to the gas release port, and flows into the gas passage 11, so as to better monitor the micro-water and decomposition products of the insulating gas through gas circulation.

In this embodiment, the self-inspection module 7 is connected to the pointer displacement sensor 3 and the temperature-pressure sensor 51 respectively, and is used to receive the density data of the insulating gas and the pressure data of the insulating gas at 20°C, and perform density data self-inspection based on the density data of the insulating gas and the pressure data of the insulating gas at 20°C. The density data sensing can be carried out synchronously through the pointer displacement sensor and the temperature and pressure sensor. The monitoring means are complete, and self-checking can be realized.

Preferably, based on the density data of the insulating gas and the pressure data of the insulating gas at 20°C, a self-test of the density data is performed, including:

Based on the density data of the insulating gas and the pressure data of the insulating gas at 20°C, a difference Δρ therebetween is determined, and based on the difference, a density treatment type is determined. Specifically, based on the difference, the density processing type is determined, including: setting the first preset difference Δρ1 and the second preset difference Δρ2, and 0<Δρ1<Δρ2; when Δρ1 ≤ |△ρ|<△ρ2, determine the early warning type as data deviation early warning; when |△ρ|≥△ρ2, determine the early warning type as data error early warning. Among them, when |△ρ|<△ρ1, no processing is required.

Determine the density control strategy based on the density processing type, and perform self-check adjustment based on the density control strategy. Specifically, the density control strategy is determined based on the density processing type, including: when the early warning type is data deviation early warning, the control strategy is to correct the pointer displacement sensor based on the insulating gas pressure data at 20°C; when the early warning type is data error early warning, the control strategy is to replace the density relay body.

Continuing to refer to FIG. 1, the data integration module 8 includes: an integration submodule 81, a wireless transmission submodule 82, and a power supply submodule 83; wherein, the integration submodule 81 is used to receive density data, temperature data, insulating gas pressure data at 20°C, composition and composition content data of decomposition products, and micro-water data, and transmit the density data, temperature data, insulating gas pressure data at 20°C, composition and composition content data of decomposition products, and micro-water data to the wireless transmission sub-module 82, that is, to collect and transmit all sensor data to the wireless transmission sub-module 8 2. The wireless transmission sub-module 82 is used to transmit density data, temperature data, insulating gas pressure data at 20°C, composition and composition content data of decomposition products, and micro-water data to the terminal through wireless transmission, which can realize wireless transmission of all sensor data with the wireless receiving host. Through the wireless communication mode, the original density relay wiring is not changed, and the connection method can be conveniently installed. The power supply sub-module 83 is used for power supply. It can use a power conversion module (24V to 3.6V) or directly use a high-efficiency lithium battery to supply power to the circuit unit according to site requirements. It can also use solar power or electromagnetic induction power supply to supply power to the relay unit 24 and the integrated sub-module 81. Wherein, the relay unit 24 is connected with the integrated sub-module 81 through a cable, and the junction box 6 can be connected with the integrated sub-module 81 through a cable, and then connected with an external cable to realize connection of signals and power.

In this embodiment, the data acquisition unit 4 may be provided with a connection terminal 54 for connecting to the data integration module 8 to realize power supply and remote data transmission.

To sum up, the on-line monitoring device for non-electric parameters of insulating gas provided by this embodiment realizes the connection between the device and the gas-insulated power equipment through the connection interface 1, and realizes the extraction of gas to realize the online monitoring of the insulating gas; the density of the insulating gas is displayed through the density relay body 2, and the density data of the insulating gas is obtained through the pointer displacement sensor 3; On-line monitoring of the insulating gas in the gas circulation chamber 4 is carried out through the data acquisition module 5 to obtain temperature and pressure data of the insulating gas, micro-water data of the insulating gas, and composition and component content data of the decomposition products of the insulating gas, realizing the integration of multi-parameters of the insulating gas and the online monitoring of the density relay, and realizing the multi-parameter monitoring of the insulating gas including density, temperature, pressure, micro-water and decomposition products, and solving the problem of a single monitoring amount of the existing density relay and a large workload due to manual recording of data. The device also has the following advantages:

(1) Without changing the original gas circuit interface and electrical wiring, the insulation multi-parameter on-line monitoring and gas density relay are integrated, realizing that the device has both relay function and multi-parameter on-line monitoring function.

(2) The non-electrical monitoring parameters of insulating gas include density, temperature, pressure, micro-water and decomposition products. The monitoring quantities are complete and diverse, and reflect the operating status of insulating gas in multiple dimensions.

(3) Using the pointer displacement sensor to sense the change of density data, the reading data of the mechanical part and the electronic part are completely consistent, and the complete correspondence between the mechanical signal and the electronic signal is realized. At the same time, a temperature and pressure sensor is set to sense the temperature and pressure of the insulating gas, and P20 is obtained by using the SF6 temperature and pressure formula. The two sets of data can be compared and self-checked. At the same time, temperature monitoring can provide basic data for liquefaction early warning; among them, P20 is the pressure value of the insulating gas corrected to 20 °C.

(4) The design of the air circuit unit is reasonable and ingenious. The distribution design of the sensors can realize accurate and reliable sensing of various parameters. The pointer displacement sensor is located near the pointer of the dial, which can fully reflect the change of pointer displacement. The temperature and pressure sensor is located near the air inlet, which can most directly reflect the atmospheric room temperature and pressure.

(5) The device uses a wireless communication module to communicate with the host, and the power supply for the remote transmission part can be provided by a power conversion module or a high-power battery without changing the original wiring method. For example, replacing the existing density relay meter in the station, there is no cumbersome wiring, which is convenient and quick.

It should be noted that, in the description of the present invention, terms such as "upper", "lower", "left", "right", "inner", "outer" and other indicated directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, rather than indicating or implying that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as limiting the present invention.

In addition, it should be noted that, in the description of the present invention, unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediary, or an internal connection between two components. Those skilled in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (10)

1. An insulating gas non-electric parameter online monitoring device, characterized in that it comprises: A connection interface, which is provided with a gas passage inside, and the connection interface is used to connect the gas chamber gas port of the gas-insulated power equipment, so that the insulating gas in the gas-insulated power equipment flows into the gas passage; The density relay body is provided with a density detection channel inside, and the density detection channel is connected with the gas channel for detecting and displaying the density of the insulating gas in the density detection channel; the density relay body is provided with a mechanical dial, and the mechanical dial is provided with scales and pointers for displaying the density of the insulating gas; The pointer displacement sensor is arranged on the mechanical dial, and is used to use the principle of measuring the displacement of the pointer and the zero value to correspond the pointer displacement to the scale of the dial, realize the electronic display value of the mechanical meter, and obtain the density data of the insulating gas; A gas circulation chamber, which communicates with the gas passage, is used to guide the insulating gas into the gas circulation chamber, flow along the gas circulation chamber, guide it into the gas passage, and flow out into the gas-insulated power equipment, so as to realize the circulation of the insulating gas; The data acquisition module is used for on-line monitoring of the insulating gas in the gas circulation chamber to obtain the temperature and pressure data of the insulating gas, the composition and composition content data of the decomposition products of the insulating gas, and the moisture data of the insulating gas. 2. The on-line monitoring device for non-electrical parameters of insulating gas according to claim 1, wherein the data acquisition module comprises: The temperature and pressure sensor is arranged upstream of the gas circulation chamber, and is used to detect the temperature and pressure of the insulating gas in the gas circulation chamber, obtain the temperature data and pressure data of the insulating gas, and determine the pressure data of the insulating gas corrected to 20°C based on the temperature data and pressure data of the insulating gas; A decomposition product sensor, which is arranged downstream of the gas circulation chamber, is used to monitor the decomposition products of the insulating gas, and obtain the composition and composition content data of the decomposition products of the insulating gas; The micro-water sensor is arranged between the temperature and pressure sensor and the decomposition product sensor, and is used to monitor the micro-water of the insulating gas and obtain the micro-water data of the insulating gas. 3. The insulating gas non-electric parameter online monitoring device according to claim 2, further comprising: A self-inspection module, which is respectively connected to the pointer displacement sensor and the temperature-pressure sensor, is used to receive the density data of the insulating gas and the pressure data of the insulating gas at 20°C, and perform self-inspection of the density data based on the density data of the insulating gas and the pressure data of the insulating gas at 20°C. 4. The on-line monitoring device for non-electrical parameters of insulating gas according to claim 3, characterized in that the density data self-inspection is performed based on the density data of the insulating gas and the pressure data of the insulating gas at 20°C, including: Based on the density data of the insulating gas and the pressure data of the insulating gas at 20°C, determine the difference △ρ between the two, and based on the difference, determine the type of density treatment; Determine the density control strategy based on the density processing type, and perform self-check adjustment based on the density control strategy. 5. The on-line monitoring device for non-electrical parameters of insulating gas according to claim 4, wherein the determination of the density processing type based on the difference includes: Set the first preset difference △ρ1 and the second preset difference △ρ2, and 0<△ρ1<△ρ2; When △ρ1≤|△ρ|<△ρ2, determine the early warning type as data deviation early warning; When |△ρ|≥△ρ2, it is determined that the early warning type is data error early warning. 6. The on-line monitoring device for non-electrical parameters of insulating gas according to claim 5, wherein the determination of the density control strategy based on the density processing type includes: When the early warning type is data deviation early warning, the control strategy is to calibrate the pointer displacement sensor based on the insulating gas pressure data at 20°C; When the early warning type is data error early warning, the control strategy is to replace the density relay body. 7. The insulating gas non-electric parameter online monitoring device according to any one of claims 1 to 6, further comprising: A data integration module, which is connected to the data acquisition module, and is used to receive density data, temperature data, insulating gas pressure data at 20°C, composition and composition content data of decomposition products, and micro-water data; The early warning type determination module is connected to the data integration module, and is used to determine the early warning type based on density data, temperature data, insulating gas pressure data at 20°C, composition and composition content data of decomposition products, and micro-water data; A control module, configured to determine a control strategy associated with the warning type, so as to control the gas-insulated electrical equipment based on the control strategy. 8. The on-line monitoring device for non-electrical parameters of insulating gas according to claim 7, characterized in that the early warning type is determined based on density data, temperature data, insulating gas pressure data at 20°C, composition and composition content data of decomposition products, and micro-water data, including: When it is determined that the solid insulation is eroded based on the preset erosion rules, the early warning type is determined as a fixed insulation eroded early warning; When it is determined based on the preset overheating rule that an overheating fault occurs, the early warning type is determined to be an overheating fault early warning; When it is determined based on the preset discharge rules that a discharge fault occurs, the early warning type is determined to be a discharge fault early warning; Wherein, the preset erosion rule is: when it is determined based on the composition and composition content data of the decomposed product that the composition content of CS2 continues to increase within the first preset time period, and the composition content of CS2 is greater than the first preset content, it is determined that the fixed insulation is eroded; The preset overheating rule is: when it is determined based on the components of the decomposed product, component content data, and temperature data that the component content of SO2 is greater than the second preset content, the component content of H2S is greater than the third preset content, and the temperature is greater than the preset temperature value, it is determined that an overheating fault occurs; The preset discharge rule is: when it is determined based on the composition and component content data of the decomposition product that the component content of SO2 is greater than the fourth preset content, the component content of H2S is greater than the fifth preset content, and the component content of C3F8 is greater than the sixth preset content and CO2, it is determined that a discharge fault occurs; The second preset content is smaller than the fourth preset content, and the third preset content is smaller than the fifth preset content. 9. The on-line monitoring device for non-electrical parameters of insulating gas according to claim 8, wherein said determination of a control strategy associated with said early warning type includes: When the warning type is fixed insulation erosion warning, the control strategy is to cut off the power and check the internal insulation condition of the equipment; When the warning type is overheating fault warning, the control strategy is to cut off the power and find the overheating fault point, and process the overheating fault point to eliminate the overheating fault; When the early warning type is discharge fault early warning, the control strategy is to find the discharge point and process the discharge point to eliminate the discharge fault. 10. The insulating gas non-electrical parameter online monitoring device according to any one of claims 1 to 6, characterized in that, The gas circulation chamber is provided with a drainage fan, which is used to drain the insulating gas, so that the insulating gas flows from upstream to downstream along the gas circulation chamber after being discharged from the gas passage, and circulates back into the gas passage; The gas circulation chamber is also provided with an air release port for discharging air.