KR20110059479A - Electric power facility monitoring device - Google Patents

Abstract

PURPOSE: An apparatus for monitoring the abnormality of an electric machine is provided to detect a change of an internal temperature of a gas insulating electric device and a gas insulating opening and shutting device in a wireless method and monitor a change of internal pressure or density of the electric machine. CONSTITUTION: A temperature sensing unit(10) of an IR(Infrared Ray) temperature detection type monitors the internal temperature change of a tested body(14). A monitoring device(1) receives a detected temperature per detected tested body by RF(Radio Frequency). The monitoring unit changes the detected temperature into a digital signal. The monitoring unit changes the digital signal into a density value compared to temperature. When a reduced gas density value escapes a set safety density range, the monitoring unit outputs a control signal for warning or locking.

Description

Electric power facility monitoring device

The present invention is to monitor the sudden change in the interior of the electrical equipment by constantly monitoring the internal density / pressure change of the gas insulated electrical device or gas insulated switchgear having a plurality of gas compartments, such as gas insulated equipment or gas insulated switchgear In particular, the change of the internal temperature value of the gas insulated device or gas insulated switchgear according to the change of the internal pressure or the density is read non-contacted from the bus wire drawn out of the device, and the warning of the change in the pressure or density inside the device is displayed. The present invention relates to an electrical equipment abnormality monitoring device that generates a control signal for blocking input and output of electrical equipment.

As is well known, according to the stable power supply, large capacity, and miniaturization of electrical equipment, insulation media such as SF6 gas with excellent insulation performance (TA6 gas, dry air, nitrogen) inside the grounded enclosure (TANK) of electrical equipment. Gas and the like).

In the case of such electric equipment, the internal pressure and temperature of the enclosure of the electric equipment may be reduced or increased due to leakage of the insulating medium and abnormal voltages and currents from inside and outside, which may lead to a serious accident.

Recently, in order to minimize the risk of accidents and reduce the ripple effect, electric equipment that has increased safety by separating the TANK of the electric equipment into a plurality of gas compartments has been commercialized. Since pressure and temperature can be maintained without abnormality, a pressure gauge or a density gauge for constant monitoring is provided.

1 is provided with a pressure gauge or a density meter for measuring the pressure state or density for each gas compartment in the case of an electric machine having a plurality of gas compartments, and the pressure or density value signal measured by these pressure gauges or density gauges is one monitoring device. Shows a schematic configuration of the prior art in which the integrated processing is performed to display the value and to generate an alarm / lock signal.

Figure 2 is a specific configuration example of the prior art as a monitoring device for one electric device configured to enable communication with a remote computer via a communication module while simultaneously measuring and processing pressure and temperature in a plurality of gas compartments at the same time It is showing.

In particular, here, a pressure / temperature sensor is installed in each of the gas compartments of the electric equipment, and the sensing signals inputted from these pressure / temperature sensors are converted into digital signals to be calculated and displayed at the same time. It is configured to output a control signal for alarm or lockout when the value is out of the set safety density range.

The sensor signals input from the pressure / temperature sensors are converted into voltage values by an input converter, and the voltage values are converted into digital signals through an A / D converter and input to the central operation controller.

The central operation control unit calculates the density of each gas compartment based on the digital signals input through the A / D converter, and outputs a control signal for alarm or correction through the control signal generator when the operation density value is out of the set safety density range. Done.

In addition, the central operation control unit displays the density of each gas compartment calculated and measured in a digital value on the display unit.

In addition, the central operation control unit is coupled to the key input to enable the setting of the operation mode or the safety density range, the power required for operation from the external power supply is supplied through the power supply.

However, the electric device monitoring apparatus of the prior art as described above has a problem that the productivity of the sensor mounting work of the internal compartment of the monitored electric device is increased by adopting the temperature sensor and the density sensor.

In particular, the sensor mounting on the durability of electrical equipment has the disadvantage that the degree of freedom of choice of the sensor parts is inferior because it causes deformation of the structure of the electrical equipment or the sensor mounting structure must be considered at the manufacturing stage of the electrical equipment. Since the high voltage power noise generated by the electric equipment is included in the temperature sensing value or the density sensing value, the internal temperature value or the internal density value of the electric equipment cannot be extracted.

The present invention is to solve the problems of the prior art as described above, an object of the present invention is to wirelessly change the internal temperature of the gas insulated electrical apparatus or gas insulated switchgear having a plurality of gas compartments by the combination of IR and RF Non-contact sensing and transmission, and the central control unit substitutes this into the reference table DB for temperature-density to monitor the pressure or density change of each internal compartment at all times, and in case of sudden change in the gas insulator or gas insulated switchgear. An object of the present invention is to provide an abnormality monitoring device for an electrical device that can output alarm and lockout control signals.

Electrical apparatus abnormality monitoring device of the present invention for achieving the above object is to wirelessly monitor the internal temperature change of each gas compartment, that is, the gas compartment of the gas insulated electrical device or gas insulation switchgear having a plurality of gas compartments. Infrared temperature detection method detects the gas density in each subject by converting it into a digital signal and converting it into a digital signal and converting it into a gas density value compared to a temperature by wirelessly transmitting the detected temperature of each gas compartment detected by the temperature sensing unit and the temperature sensing unit. It characterized in that it comprises a monitoring device that displays and outputs a control signal for alarm or lockout when the converted gas density value is outside the set safety density range.

The electronic device abnormality monitoring apparatus according to the present invention detects and transmits a change in the internal temperature of a gas insulated electric device having a plurality of gas compartments or a gas insulated switchgear by a wireless method by combining IR and RF, and transmits the inside of the electric device. Since the pressure or density change is monitored, the workability is significantly improved compared to the installation of a sensor for monitoring gas insulated electrical equipment or gas insulated switchgear, and the power noise is inserted into the detection signal through the wireless signal transmission system. Since it is possible to minimize the temperature detection error of the internal compartment of the electrical equipment, it is possible to improve the accuracy of the abnormality monitoring device of the electrical equipment.

Hereinafter, the present invention will be described with reference to the accompanying drawings.

3 is a block configuration diagram of an apparatus for monitoring an abnormality of an electrical apparatus according to the present invention, and a temperature sensing unit 10 of an infrared temperature detection method for largely monitoring an internal temperature change of an object 14 by wireless (IR), and The detected temperature of each subject detected by the temperature sensing unit is transmitted by radio (RF), converted into a digital signal, converted into a gas density value compared to the temperature, and the gas density value of each subject is displayed, and the converted density value is set to a safety density. It is composed of a monitoring device (1) for outputting a control signal for alarm or lockout when out of range.

Here, the object 14 is an electric device that can be represented by a gas insulated device or a gas insulated switchgear, and refers to an internal compartment filled with insulating gas.

Specifically, the temperature sensing unit 10 wirelessly detects an infrared temperature sensor 11 for sensing the temperature of the bus line 15 of the subject 14 and a sensing temperature value sensed by the infrared temperature sensor. It includes an RF modulator 12 for transmitting the modulated to the temperature sensing unit 10 is fixedly supported at a position spaced a certain distance from the subject by the bracket and the support (13).

The bus bar 15 may be a bus bar in which the insulating gas extends from the inside of the inspected object 14, for example, a gas insulator or a gas insulated switch.

Normally, the busbar uses copper material with high electrical conductivity, and the copper material has a very high temperature conductivity, so that the internal temperature of the subject is almost completely represented without loss. Therefore, the temperature of the bus bar non-contactedly sensed by the infrared temperature sensor 11 of the temperature sensing unit 10 substantially corresponds to the internal temperature of the subject 14.

The temperature sensing unit 10 is configured to RF-modulate a plurality of subject temperature sensed by the infrared temperature sensor 11 to the wireless receiving unit 30 in the monitoring device 10 wirelessly.

The monitoring device 1 is a wireless receiving unit 30 for receiving the internal temperature value of the subject wirelessly transmitted from the plurality of temperature sensing unit 10 and the internal temperature detection signal for each subject received by the wireless receiving unit is digital. A / D converter 40 converting the signal and the internal temperature detection signal for each object input from the A / D converter are converted to the current gas density value in comparison with the temperature-density correlation table DB 120 A display unit 70 and a central operation controller 50 for outputting a control signal for alarm or correction when the current gas density value is out of the set safety density range by comparing the current gas density value with a reference value, and a display mode on the display unit. And a key input unit 80 for selecting, generating a control signal for outputting an alarm signal and a lockout signal for a corresponding electric device in a communication module 100 for communicating with an external central monitoring system 7 and an abnormal situation. It may include 60.

In addition, the monitoring device 1 is configured by connecting the power supply 5 for supplying the operation and driving voltage for each component is applied through the power supply unit 90.

Hereinafter, the operation of the present invention will be described.

First, the infrared temperature sensor 11 of the temperature sensing unit 10 extends and is exposed from the inside of the inspected object 14 filled with the insulating gas (inner compartment of the gas insulated electric device or the gas insulated switchgear). The temperature of is sensed non-contact by infrared (Infra Red). The insulation gas temperature inside the subject 14 shown in the sensed bus line 15 is modulated by the RF transmitter 12 into a radio transmission signal and transmitted to the radio receiver 30 of the monitoring device 1. The temperature sensing unit 10 may be arranged to sense the internal temperature of the subject under test in a state of being fixedly supported by the bracket and the support 13 as necessary.

The wireless receiving unit 30 is input to the detection temperature signal value of the plurality of temperature sensing unit which is installed in proximity to each of the plurality of subjects to sense the internal temperature of the subject in a non-contact manner.

The non-contact temperature detection signal of each temperature sensing unit input to the wireless receiving unit 30 of the monitoring device 1 by radio (RF) is sequentially passed through the filter unit 110 to remove the noise included in the temperature detection signal A. The digital signal is converted into a digital signal by the / D converter 40 and input to the central operation controller 50.

The central operation controller 50 substitutes the input temperature detection signal for each subject into a database table included in the temperature-density correlation table DB 120 to find a gas density value corresponding to the current temperature.

The temperature-density correlation table DB 120 is a database in which the corresponding temperature values when the gas density gradually decreases from the temperature values when the gas density of the subject is steady. This is a database created based on the fact that when the gas density in the test object is lowered, the insulation becomes poor and the temperature inside the electric device under test is increased, and thus the temperature of the bus bar 15 exposed to the outside in communication with the inside is increased. to be.

Based on the temperature-density table data as described above, the measurement value of the insulation gas density conversion for each subject in the central calculation controller 50 is displayed as the current insulation gas density digital value through the display unit 70.

4 shows a specific configuration of the display unit 70 and the key input unit 80 of the monitoring device of the present invention.

Here, the density display panel 71 composed of a plurality of FNDs displays the density value measured by the central operation control unit 50 as a digital number, and the pressure accuracy display window 73 is arranged in an arc shape on the front side of the monitoring device. Quantitatively indicate the measured pressure of the gas compartment.

In addition, the safety range display window 75 is arranged in a concentric arc shape with the pressure degree display window 73 provided on the front side of the monitoring device to continuously display the safety range and the upper and lower risk range.

The two operation display lamps 77 and 79 are installed on the front side of the monitoring device to indicate whether the alarm signal by the control signal generating unit 60 and the control signal indicating the high or low state are output.

The up / down button 81 of the key input unit 80 provided below the front center of the monitoring device is a gas compartment, that is, a button for selecting an object, and the mode selection button 83 is a button for setting an operation mode. And, the safety range setting button 85 is a button that can set the safety density range.

On the other hand, the insulation gas density conversion measurement value for each subject in the central computation controller 50 based on the temperature-density table data described above, that is, the insulation gas density value for each subject, which is currently displayed, is preliminary in the central computation controller 50. It is determined whether it is out of the safety density value range set in FIG.

At this time, if the insulation gas density of the subject falls outside the set safety density value, the central operation controller 50 outputs an alarm signal and a correction signal to the outside through the control signal generator 60 to notify the manager of the current emergency situation. At the same time, the electric wires of the electric equipment are cut off.

Since the central operation control unit 50 of the monitoring device operating in this way can exchange information with the central monitoring system 7 at a remote location through the communication module 100, a plurality of subjects having a non-contact temperature sensing-based monitoring device It is possible to observe and control the internal insulation gas density of the electrical equipment through the central control system 7 at a central control station at a location remote from the system.

1 is a mounting example of a conventional gas insulated electric device internal compartment sensor device.

2 is a block diagram of a conventional gas insulated electric device abnormality monitoring apparatus.

3 is a block diagram of a gas insulated electric device or a gas insulated switchgear abnormality monitoring device according to the present invention.

4 is a configuration diagram of a display unit and a key input unit of a gas insulated electric device or a gas insulated switchgear monitoring device according to the present invention.

* Description of the symbols for the main parts of the drawings *

1: monitoring device 5: power supply

7: central monitoring system 10: temperature sensing unit

11: infrared temperature sensor 12: RF modulator

13 bracket and support 14 subject

15: bus 30: radio receiver

40: A / D converter 50: central operation control unit

60: control signal generator 70: display unit

80: key input unit 90: power supply unit

100: communication module 110: filter

120: temperature-density correlation table DB

Claims (3)

A temperature sensing unit 10 of an infrared temperature detection method for wirelessly monitoring an internal temperature change of the subject 14 including a gas insulated electric device or a gas insulated switchgear, and the blood detected by the temperature sensing unit The detection temperature of each sample is transmitted by radio (RF), converted into a digital signal, and converted into a density value compared to the temperature, and the gas density value of each subject is displayed on the display, and the converted gas density value is outside the set safety density range. In the case of an electrical equipment abnormality monitoring device, characterized in that consisting of a monitoring device (1) for outputting a control signal for alarm or lockout. The method of claim 1, wherein the temperature sensing unit 10 is a non-contact infrared temperature sensor 11 for sensing the temperature of the bus line 15 of the subject 14 and the detected temperature value sensed by the infrared temperature sensor And an RF modulator (12) for modulating and transmitting wirelessly (RF), wherein the temperature sensing unit is fixed and supported by a bracket and a support (13). According to claim 1, wherein the monitoring device (1) is a wireless receiving unit 30 for receiving the internal temperature value of the subject wirelessly transmitted from the plurality of temperature sensing unit 10, and for each subject received by the wireless receiving unit The A / D converter 40 which converts the internal temperature detection signal into a digital signal, and the internal temperature detection signal for each object input from the A / D converter are compared with the temperature-density correlation table DB 120. A central operation controller 50 for converting the gas density value into a display unit 70 and outputting a control signal for alarm or determination when the current gas density value is out of the set safety density range by comparing the current gas density value with a reference value; Electrical apparatus abnormality monitoring device comprising a key input unit (80) for selecting a display mode on the display unit.

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