CN217278757U - Partial discharge arc characteristic test device of cable insulation layer - Google Patents
Partial discharge arc characteristic test device of cable insulation layer Download PDFInfo
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- CN217278757U CN217278757U CN202220753039.0U CN202220753039U CN217278757U CN 217278757 U CN217278757 U CN 217278757U CN 202220753039 U CN202220753039 U CN 202220753039U CN 217278757 U CN217278757 U CN 217278757U
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Abstract
The utility model provides a cable insulation's partial discharge arc characteristic test device, this test device includes: the device comprises a vacuum container, a discharge module, an oscillography module, a temperature monitoring module and a gas collection module; the glass plug and the glass cup with a valve on the side wall form a vacuum container, a cable sample placing pedestal is arranged in the vacuum container, a fiber grating temperature sensor is plugged into a central opening of the cable sample, and the two electrodes are coaxial with the fiber grating temperature sensor; the fiber grating temperature sensor is connected with the fiber grating demodulator through an optical fiber; the circuit is connected with the electrode, the voltage sensor, the current sensor, the step-up transformer and the resistance box; the voltage sensor and the current sensor are input into the digital oscilloscope and output to the computer; the side wall valve of the container is connected with a vacuum pump or an injector. Through the technical scheme of the utility model, can simulate real condition and discharge heat, electric decomposition cable insulation, study the volatility characteristic thing of arc characteristic and release for carry out the early warning to early conflagration.
Description
Technical Field
The utility model relates to a power electronics measuring technical field particularly, relates to a cable insulation layer's partial discharge arc characteristic test device.
Background
The cable is a device for transmitting electric energy and electric signals, and the cable trench is an underground pipeline for transmitting power to the outside by a transformer substation and is used for laying cables and replacing power cable facilities. The layout of the cables of the transformer substation adopts a mode of laying in the same trench, once one cable suddenly catches fire, the nearby cable can be ignited, and the flame can quickly spread along the cable laying direction. Moreover, the cable trench is basically isolated from the external environment in the operation process, and the overall position is in a relatively hidden area, so that the difficulty of people in finding and extinguishing fire is increased.
The automatic fire alarm system of the existing cable trench detects various physical phenomena which are generated after a fire disaster occurs by arranging sensors for sensing smoke, flame, temperature and the like, and can not predict in advance to cause great damage and loss.
The cable in the cable trench consists of a protective layer, an insulating layer, a semi-conducting layer and a conductor, wherein the insulating layer and the protective layer belong to macromolecular combustible substances except a core conductor, and can generate the phenomena of combustion, thermal degradation, thermal decomposition, electrical degradation, electrical decomposition and the like at high temperature. Practical experience with the operation of power cables has shown that deterioration or failure of the insulation is the primary cause of insulation breakdown and hence fire. High voltage cables have higher transmission voltages, and the cable is more severely corroded by insulation, and the cable insulation material can be damaged more greatly when the cable insulation material fails. Therefore, if the volatile characteristic of the cable insulation material can be detected before the cable insulation material fails, early fire can be warned, and larger loss can be avoided, but the characteristic of the volatile material is not clear at present, and the physical parameters such as temperature and voltage when the volatile material is generated are not clear, so that a test device is needed for detection test, the device needs to be capable of adjusting the discharge current, and the relation between the current characteristic and the test cable can be observed.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a: provided is a partial discharge arc characteristic test device for a cable insulation layer.
The technical scheme of the utility model is that: there is provided a partial discharge arc characteristic test apparatus of a cable insulation layer, the apparatus including: the device comprises a vacuum container, a discharge module, an oscillography module and a temperature monitoring module;
the vacuum vessel includes: the glass cup, the glass plug, the valve and the sample placing pedestal;
the opening of the glass cup is upward, the glass plug seals the opening of the glass cup, a gap between the glass plug and the opening of the glass cup is sealed by a sealing ring, a valve communicated with the inner cavity of the glass cup is arranged on the side surface of the glass cup and is used for connecting a vacuum pump, and a sample wafer placing pedestal is arranged in the glass cup;
the discharge module includes: the device comprises two electrodes, a voltage sensor, a current sensor, a resistance box and a boosting transformer;
the two electrodes penetrate through the holes in the side wall of the glass cup and are oppositely arranged and coaxial with each other, and sealant is coated at the joint of the two electrodes and the glass cup; the cable sample wafer is arranged in the sample wafer placing pedestal, a small hole is formed in the middle of the cable sample wafer, the axes of the two electrodes penetrate through the small hole, and a voltage sensor, a current sensor and a boosting transformer which are connected in series are respectively connected between the two electrodes, wherein the boosting transformer is externally connected with a power supply;
the scope module includes: a digital oscilloscope;
two input ends of the digital oscilloscope are respectively connected with the output ends of the voltage sensor and the current sensor;
the temperature monitoring module includes: the fiber grating temperature sensor and the fiber grating demodulator;
the fiber bragg grating temperature sensor is connected with the fiber bragg grating demodulator, and a probe of the fiber bragg grating temperature sensor is positioned in a small hole in the middle of the cable sample wafer.
In any of the above technical solutions, further, the apparatus further includes: a gas collection module; the extraction device in the gas collection module is an injector and is connected with a valve when in use.
In any one of the above technical schemes, further, the syringe is connected with a rubber sealing tube when in use, and the other end of the rubber sealing tube is connected with a valve to ensure sealing before extraction.
In any of the above technical solutions, further, the sample-placing stand is a u-shaped bracket, and the cable sample is inserted from the upper end opening between the two vertical sides of the u-shaped bracket.
In any of the above technical solutions, further, the cable sample is taken from the cable insulation layer and is a square cut piece.
In any of the above technical solutions, further, the resistance box can freely adjust the resistance of the access circuit, and the resistance value of the resistance box can be adjusted to 0 Ω at minimum.
In any one of the above technical solutions, further, the oscillometric module further includes: a computer;
the digital oscilloscope is connected with the computer through a data line.
The utility model has the advantages that:
according to the technical scheme of the utility model, the glass plug is arranged above the glass cup and can be installed and disassembled, so that the cable sample wafer can be conveniently replaced; the process of placing the sample wafer on the double-layer bracket with the U-shaped design is simple and rapid, supporting force is formed on three edges of the square sample wafer, the square sample wafer is more stable, and the central part is not obstructed and does not influence the passing of electric arcs; sealing measures are taken at the joints of the vacuum container and each part, so that the gas components finally collected by the device are more accurate;
the resistance box access circuit with adjustable resistance value is convenient for adjusting circuit current and has different influences on generated electric arcs; the circuit parameters can be measured and output through the voltage sensor and the current sensor, and the circuit parameters are input into the digital oscilloscope to facilitate the observation of images and are finally transmitted into a computer to analyze the arc characteristics by using software.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of a partial discharge arc characteristic testing apparatus for a cable insulation layer according to an embodiment of the present invention;
fig. 2 is a schematic side view of a glass container of an apparatus for testing partial discharge arc characteristics of an insulating layer of a cable according to an embodiment of the present invention.
101-glass plug, 102-valve, 103-sample placing pedestal, 104-glass cup, 201-two electrodes, 202-voltage sensor, 203-current sensor, 204-step-up transformer, 205-resistance box, 206-digital oscilloscope, 207-computer, 301-fiber grating temperature sensor, 302-fiber grating demodulator and 401-cable sample.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and thus the scope of the present invention is not limited by the specific embodiments disclosed below.
According to researches, the cable insulation material can generate different Volatile Organic gases (VOCs) when thermal degradation and electrical degradation at high temperature are close to critical combustion, and the VOCs can be used as combustion characteristics to identify a fire disaster, so that the accuracy of fire disaster detection can be effectively improved. Through the research on the partial discharge (release characteristic gas detection technology) of the XLPE (cross-linked polyethylene) cable, when the partial discharge occurs due to the defect in the cable joint, the insulation material around the partial discharge point can be decomposed and damaged, certain gas is released, the gas generated by the partial discharge under different discharge conditions is collected, and the working state of the intermediate joint of the XLPE cable can be evaluated through the detection of the gas.
The embodiment provides a partial discharge arc characteristic test device of cable insulation, and the device includes: the device comprises a vacuum container, a discharge module, an oscillography module, a temperature monitoring module and a gas collection module.
As shown in fig. 1, the vacuum container of the experimental apparatus can make a vacuum environment, and the vacuum container is characterized in that: the glass plug 101 is arranged above the glass 104, and the side surface of the glass 104 is provided with a valve 102 which is connected with a vacuum pump or an injector; the pedestal 103 is placed to the inside sample that sets up of glass 104, and this pedestal 103 comprises two glass materials, has certain space between two, fixes in glass 104 inside diameter department.
As shown in fig. 2, the glass sheet is "U" shaped, so that the cable sample 401 can stand between the two sheets; the components of the system are sealed by using a sealing ring and a sealant, and in addition, as shown in fig. 1, the electrode 201 and the temperature monitoring module 301 and 302 penetrate through the opening on the side wall of the glass 104, and the sealant is used for sealing the gap.
The circuit of the discharge module includes: two electrodes 201, a voltage sensor 202, a current sensor 203, a resistance box 205, a booster transformer 204; connecting by using a lead; two ends of a voltage sensor 202 are respectively connected to the two electrodes 201, one end of a current sensor 203 is connected with the electrodes 201, the other end of the current sensor 203 is connected with a resistor box 205, the resistor box 205 can freely adjust the resistance of an access circuit, the minimum value can be adjusted to be 0 omega, the other end of the resistor box 205 is connected with a booster transformer 204, the booster transformer 204 internally comprises a fixed load, the fixed load plays a role in circuit protection, a power supply is externally connected, a vacuum arc is formed between the two electrodes 201 during use, and various parameters of the arc can be changed by adjusting the resistor box 205 and the booster transformer 204.
The oscillography module comprises a digital oscilloscope 206 and a computer 207, wherein a voltage sensor 202 and a current sensor 203 are respectively connected to two input ends of the digital oscilloscope 206, the output end of the digital oscilloscope 206 is connected with the computer 207, a current-voltage curve is observed on a screen of the digital oscilloscope 206, data are recorded and processed by using software of the computer 207, and arc characteristics are analyzed.
The temperature measuring module comprises a fiber bragg grating temperature sensor 301 and a fiber bragg grating demodulator 302 which are connected through optical fibers, the optical fibers penetrate through the side wall of the glass cup 104, and the fiber bragg grating temperature sensor 301 is fixed on the cable sample wafer 401; the temperature sensor 301 is an intrinsic type optical fiber sensor, replaces a traditional thermistor, is characterized by small size and electromagnetic insensitivity, and is particularly suitable for temperature measurement in a complex electromagnetic environment.
The gas collection method of the gas collection module adopts a mode of extracting by an injector, the injector is connected with the valve 102, and meanwhile, a rubber pipe is used for wrapping the joint to ensure the sealing property.
In this embodiment, the glass plug 101 can be mounted and dismounted, and the detachable structure facilitates replacement of different cable sample wafers 401; the glass plug 101 may be in various structures such as piston type or screw type, and the contact surfaces of the glass cup 104 and the glass plug 101 each include at least one sealing ring.
As shown in fig. 2, in this embodiment, the cable sample 401 is taken from the cable insulation layer, and should be cut into a square suitable for the sample placing pedestal 103, the side length should be equal to the inner diameter of the glass cup, and a small hole should be drilled in the center of the sample to simulate the actual situation of cable damage; the electrodes 201 penetrate through the side wall of the glass cup, the height is the inner radius of the glass cup, at the height, the two electrodes 201 are coaxial with the central hole of the cable sample wafer 401, and an electric arc generated in the working process is over against the damaged position; in addition, the fiber grating temperature sensor 301 should be plugged at the small hole.
In this embodiment, the rubber tube connecting the valve 102 and the syringe should be short, before collecting the gas, the air in the gap between the syringe and the rubber tube is pumped by a vacuum pump under the condition of closing the valve 102, and then the valve 102 is opened to collect the gas by using the syringe.
In this embodiment, parameters such as the size and intensity of the arc can be changed by adjusting the resistance box 205 and the step-up transformer 204, the voltage sensor 202 and the current sensor 203 on the circuit can reflect part of parameters of the arc, and the two are input into the digital oscilloscope 206 to obtain a waveform image, and then are transmitted to the computer 207 to record and analyze data. In this way, the characteristics of the discharge arc of different parameters can be analyzed in detail.
In the present invention, the terms "fixing" and "connecting" should be understood in a broad sense, for example, the "fixing" may be fixing with an adhesive such as glue, or fixing firmly by using a physical structure; "connected" may be a fixed connection, a removable connection, or an integral connection. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The shapes of the various components in the drawings are schematic and do not preclude certain differences from true shapes, and the drawings are intended to illustrate the principles of the invention and are not intended to limit the invention.
Although the present invention has been disclosed in detail with reference to the accompanying drawings, it is to be understood that such description is merely illustrative and not restrictive of the application of the present invention. The scope of the invention is defined by the appended claims and may include various modifications, adaptations and equivalents of the invention without departing from its scope and spirit.
Claims (7)
1. A partial discharge arc characteristic testing apparatus for a cable insulation layer, the apparatus comprising: the device comprises a vacuum container, a discharge module, an oscillography module and a temperature monitoring module;
the vacuum vessel includes: a glass (104), a glass plug (101), a valve (102) and a sample placing pedestal (103);
the opening of the glass cup (104) faces upwards, the glass plug (101) seals the opening of the glass cup (104), a gap between the glass plug (101) and the opening of the glass cup (104) is sealed by a sealing ring, a valve (102) communicated with the inner cavity of the glass cup (104) is arranged on the side surface of the glass cup (104), the valve (102) is used for connecting a vacuum pump, and a sample wafer placing pedestal (103) is arranged in the glass cup (104);
the discharge module includes: two electrodes (201), a voltage sensor (202), a current sensor (203), a resistance box (205) and a booster transformer (204);
the two electrodes (201) penetrate through holes in the side wall of the glass cup (104) and are oppositely arranged and coaxial with each other, and sealant is coated at the joint of the two electrodes (201) and the glass cup (104); a cable sample wafer (401) is arranged in the sample wafer placing pedestal (103), a small hole is formed in the middle of the cable sample wafer (401), the axes of the two electrodes (201) penetrate through the small hole, a voltage sensor (202), a current sensor (203) and a boosting transformer (204) which are connected in series are respectively connected between the two electrodes (201), and the boosting transformer (204) is externally connected with a power supply;
the scope module includes: a digital oscilloscope (206);
two input ends of the digital oscilloscope (206) are respectively connected with the output ends of the voltage sensor (202) and the current sensor (203);
the temperature monitoring module includes: a fiber grating temperature sensor (301) and a fiber grating demodulator (302);
the fiber bragg grating temperature sensor (301) is connected with the fiber bragg grating demodulator (302), and a probe of the fiber bragg grating temperature sensor (301) is located at a small hole in the middle of the cable sample wafer (401).
2. The apparatus for testing partial discharge arc characteristics of an insulation layer of a cable according to claim 1, further comprising: a gas collection module; the extraction device in the gas collection module is a syringe, which in use is connected to the valve (102).
3. The apparatus for testing the partial discharge arc characteristics of the cable insulation according to claim 2, wherein the syringe is connected to a rubber sealing tube during use, and the other end of the rubber sealing tube is connected to the valve (102) to ensure sealing before extraction.
4. Device for testing the partial discharge arc characteristics of the insulating layer of a cable according to claim 1, characterized in that said sample-placing abutment (103) is a "U" -shaped support, said cable sample (401) being inserted from the upper end opening between the vertical edges of the "U" -shaped support.
5. The apparatus for testing partial discharge arc characteristics of a cable insulation layer according to claim 4, wherein the cable sample (401) is taken from the cable insulation layer and is a square cut piece.
6. The apparatus for testing the partial discharge arc characteristics of the cable insulation layer according to claim 1, wherein the resistance box (205) is capable of freely adjusting the resistance of the access circuit, and the resistance value of the resistance box (205) is adjustable to 0 Ω at minimum.
7. The apparatus for testing the partial discharge arc characteristics of a cable insulation according to claim 1, wherein said oscillometric module further comprises: a computer (207);
the digital oscilloscope (206) is connected with the computer (207) through a data line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220753039.0U CN217278757U (en) | 2022-03-31 | 2022-03-31 | Partial discharge arc characteristic test device of cable insulation layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220753039.0U CN217278757U (en) | 2022-03-31 | 2022-03-31 | Partial discharge arc characteristic test device of cable insulation layer |
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| Publication Number | Publication Date |
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| CN217278757U true CN217278757U (en) | 2022-08-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202220753039.0U Active CN217278757U (en) | 2022-03-31 | 2022-03-31 | Partial discharge arc characteristic test device of cable insulation layer |
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| CN (1) | CN217278757U (en) |
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- 2022-03-31 CN CN202220753039.0U patent/CN217278757U/en active Active
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