KR100352507B1 - Long term reliability test system for distribution lightning - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for inspecting long-term reliability of a lightning arrester for distribution, wherein the distribution fatigue device is largely composed of a characteristic element and a love tube, and is intended to protect the equipment and the line from abnormal voltage in the distribution line. However, there is a risk of human life and property damage due to love blast explosion when the arrester breaks down, so it is urgent to secure proper replacement cycles and diagnostic criteria. However, the accelerated life test performed at home and abroad is limited to evaluating the characteristic devices, so it is difficult to secure accurate replacement cycles and diagnostic criteria in the field operation situation. In the present invention, it is possible to test the characteristic element which is performed in the existing international standard, and to control the temperature and humidity in the actual arrester state to evaluate the deterioration degree of the arrester under the same conditions as the site situation, and to calculate the appropriate replacement criteria and diagnostic criteria. Has developed a long-term reliability tester. This device can simulate accelerated deterioration due to temperature and humidity voltage for the actual arrester, and can observe and analyze the change of the leakage current according to the deterioration progress. Will be available. Therefore, it is possible to test the characteristics of the lightning arrester according to the international standard, create an accelerated deterioration environment in the finished state of the arrester, and analyze the deterioration tendency due to the accelerated deterioration. .

Description

Long term reliability test system for distribution lightning arrester

The present invention relates to long-term reliability evaluation of the lightning arrester for power distribution, and relates to a long-term reliability test apparatus for preparing a lightning arrester maintenance standard for preventing the arrester failure in advance.

The lightning arrester for power distribution is largely comprised of a characteristic element and a love pipe. These arresters protect the equipment and lines from abnormal voltages by operating an abnormal voltage in the condition that 13.2 kV is continuously applied to the distribution lines. The deterioration of the arrester is caused by applied voltage, temperature, moisture absorption and surge, and the leakage current increases due to the progress of the deterioration, which in turn increases the heat generation of the device, leading to failure.

At present, the lightning arrester used in Korea uses self-protection pipes, which may cause injury to humans due to scattering of the love pipe debris when the arrester breaks down.

Therefore, proper maintenance is required through the establishment of proper replacement cycle and operation standard of arrester. To this end, long-term reliability evaluation of the arrester is essential, but there is no proper evaluation method. The configuration of the arrester is largely composed of a pipe and a characteristic element.

To date, the methods for predicting the lifetime and reliability of the arrester rely only on the evaluation of the characteristic elements. However, when looking at the type of arrester failure, it is impossible to evaluate long-term reliability only by the device test method currently proposed by the international standard because the absorber acts as a major cause of failure in addition to the deterioration of the characteristic element itself in the arrester.

Currently, a long-term reliability tester for lightning arresters used in domestic and overseas uses a method of applying an operating voltage to a characteristic device, changing a temperature, and measuring a change in leakage current accordingly.

However, this method is only a characteristic device evaluation itself, which is a matter of long-term reliability of the actual arrester.

The object of the present invention is to evaluate the long-term reliability of the arrester under the same conditions as the actual field operation situation, while also allowing the evaluation of the characteristic element itself and the temperature and humidity control.

In order to achieve the above object, the present invention provides a lightning arrester long-term reliability test apparatus, temperature and humidity control means for controlling the temperature and humidity in the chamber in which the finished lightning arrester and lightning arrester characteristic element is installed in the state that the voltage is applied to the sample; And means for measuring leakage current waveform due to accelerated deterioration, means for measuring resistance leakage current and watt loss, and program means for processing test conditions, control, and data.

The temperature / humidity control means has a temperature rising / decreasing performance of 6 ° C./min and a temperature reduction of 2 ° C./min.

In addition, the leakage current waveform measuring means is to install a 0-10mA class CT, save the waveform from the CT to the recorder and periodically save it to the PC through GPIB communication so that the deterioration state of the arrester due to deterioration can be confirmed It is composed.

The means for measuring the resistance leakage current and watt loss can perform a comparison function with data through six CTs installed for each sample, and if necessary, can measure the resistance leakage current and watt loss to accurately determine the state of the sample. The device includes a high sensitivity CT in the range 0-1 mA and includes a leakage current analyzer.

On the other hand, the test conditions, the control and the data processing means can arbitrarily set the test conditions, enable the remote control of the various devices used for the test and the acquisition of data, the leakage current, resistance leakage current, watts due to deterioration Configure loss so that it can be saved and analyzed.

1 is an overall configuration diagram of an arrester long-term reliability test apparatus according to the present invention.

2 is a configuration diagram of a constant temperature and humidity unit according to the present invention.

3 is a diagram of data acquisition and control.

<Description of the code | symbol about the principal part of drawing>

100: high voltage generator

101,102,103: Slidax 104,105,106: Step up transformer

107,108,109: voltage detector 200: leakage current detector

201,202,203,204,205,206: Leakage current detection CT

207: CT for resistance leakage current measurement

208: leakage current analyzer 310: temperature and humidity control unit

400: computer system 500: automatic voltage regulator

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an overall configuration diagram of a lightning arrester long-term reliability test apparatus according to the present invention.

The present invention is a high-voltage consisting of three systems that are supplied with external power through the automatic voltage regulator 500 to supply a voltage to the lightning arrester inside the chamber 300, the power is boosted by receiving power through the magnet contactor to each system A generator 100; A leakage current detection unit 200 for detecting a voltage to measure leakage current for each system of the high voltage generation unit 100; Three pairs of lightning arresters 301 and one dummy thermal arrester 302 for internal / humidity humidity are provided for each system supplied through the leakage current detection unit 200 to receive the same system voltage one by one in the chamber 300. A temperature / humidity control unit 310 for controlling the temperature and humidity in the chamber in which the finished lightning arrester and the lightning arrester characteristic element are installed in a state where a voltage is applied to each of the lightning arresters;

The leakage current waveform of the leakage current detection unit 200 is input to the PLC 401, and the leakage current waveform according to acceleration degradation is measured, the resistance leakage current and watt loss are measured, and the temperature / humidity control unit inside the chamber ( A program for controlling test conditions, control, and data for controlling 310 is installed, and is composed of a computer system 400 operated by an operator.

The high voltage generator 100 is for maintaining a constant input voltage to the sample arrester to apply an AC voltage (13.2 kV, 60 Hz) to the arrester. Since the arrester deterioration is sensitively affected by the applied voltage, a 20kVA automatic voltage regulator 500 is installed to maintain a constant voltage. Also, in order to adjust the magnitude of the input voltage according to the situation, each sample was provided with slidax (101, 102, 103) and a transformer (104, 105, 106).

The slide dax (101, 102, 103) is attached to a drive motor (Motor) to enable manual operation on the panel (panel) and operation by a PC. In this case, the voltage applied to each sample is stored in the PC 400 through the PLC 401 in the voltage detector 200.

In the present invention, the temperature and humidity control unit 310 is designed to enable the temperature control from -40 ℃ to 200 ℃ for effective acceleration deterioration, the temperature increase / decrease temperature performance is 6 ℃ / min, temperature reduction 2 ℃ / min The difference between the thermo-hygrostat and the design is the structure that can lower the temperature from 200 ℃ by immediately operating the freezer at high temperature without the ventilation (normally the freezer cannot operate above 70 ℃). By changing the humidity to 95%, the characteristic element in the inside of the tube was sufficiently deteriorated by heat, and the moisture absorption at the sealing portion was possible.

Inside the chamber 300, six test arresters and one dummy arrester may be mounted, and a high voltage applied to the arrester is supplied through a Teflon tube installed in the ceiling.

The temperature / humidity control unit 310 can automatically control the PC 400 by communicating with the PC 400. In addition, a temperature / humidity sensor was installed inside the dummy lightning arrestor to indirectly estimate the temperature and humidity inside the lightning arrestor sample under test. The temperature and humidity are stored in the PC 400 via the PLC 401.

CT (201, 202, 203, 204, 205, 206) was installed in each sample to measure leakage current and resistance leakage current, the most important of lightning arrester deterioration factors. The leakage current waveform was measured through the leakage current analyzer 208 and the recorder 209 through GPIB communication. It is stored in the PC 400.

2 is a configuration diagram of a constant temperature and humidity unit according to the present invention, and FIG. 3 is a diagram of data acquisition and control.

The resistance leakage current and watt loss of each arrester were configured to be installed on the ground side of the sample if necessary by using another precision CT 207 and leakage current analyzer 208 for precise measurement. Data from the leakage current analyzer 208 is stored at the PC via GPIB communication.

The arrester is deteriorated by the temperature rise of the internal characteristic element and the inflow of moisture into the inside of the pipe. In order to indirectly measure the temperature and humidity inside each sample arrester, a dummy arrester without a voltage applied without any voltage is applied, and a temperature and humidity sensor is installed therein. And humidity can be expected.

In order to accelerate the deterioration of the lightning arrester, it is necessary to calculate the deterioration cycle suitable for the use environment. The operation status and control of the whole system can be controlled by the developed program.

As described in detail above, according to the present invention, it is possible to evaluate the characteristic element itself, and to evaluate the long-term reliability of the arrester under the same conditions as the actual field operating situation through temperature and humidity control. In addition, the present invention can simulate the acceleration degradation due to the temperature and humidity voltage for the actual lightning arrester, and can observe and analyze the morphological changes of the leakage current according to the degradation progresses, so that the appropriate replacement cycle and diagnosis suitable for the environment of the arrester It may be used to determine criteria.

Claims (5)

In the lightning arrester long-term reliability test device, A high-pressure generator 100 consisting of three systems that are separated into three respective systems to supply voltage to an arrester installed in the chamber 300 and receive power up; Leakage current detection unit 200 for detecting a voltage in order to measure the leakage current for each system of the high-voltage generator 100; In the state where voltage is applied to each of the three pairs of lightning arresters and one of the internal lightning-humidity dummy lightning arresters installed in the chamber 300 for each system supplied through the leakage current detection unit 200 to receive the same system voltage one by one. A temperature / humidity control unit 310 for controlling the temperature and humidity in the chamber in which the finished lightning arrester and the lightning arrester characteristic element are installed; And The leakage current waveform of the leakage current detection unit 200 is input to the PLC 401, and the leakage current waveform according to acceleration deterioration is measured, and the resistance leakage current and watt loss are measured, and the temperature inside the chamber is measured. And a computer system (400) installed with a program for controlling test conditions, control and data for controlling humidity, and operated by an operator. The method of claim 1, wherein the temperature and humidity control unit Under the control of the computer system 400 to control the temperature control heater and the humidity control heater in the chamber 300, and to control the cooler to control the temperature and humidity, The temperature increase / decrease temperature performance is 6 ℃ / min, temperature reduction 2 ℃ / min, lightning arrester long-term reliability tester, characterized in that the structure can be lowered from 200 ℃ by immediately operating the refrigerator without high temperature ventilation. The means for measuring the leakage current waveform of claim 1, Lightning arrester long-term, characterized in that the installation of a 0-10mA class CT, and save the waveform from the CT to the recorder, and then periodically stored in the PC 400 through GPIB communication to determine the deterioration state of the arrester due to deterioration Reliability Tester. The method according to claim 1, for measuring resistance, leakage current, and watt loss, It is possible to perform data and comparison function through 6 CTs installed in each sample, and to measure the leakage current and watt loss of resistance by selectively connecting each power system to check the exact state of the sample if necessary. An arrester long-term reliability test apparatus comprising a high sensitivity CT in the range of 0-1 mA, further comprising a leakage current analyzer (208) and a recorder. The computer system of claim 1, wherein Test conditions can be arbitrarily set for test conditions, control, and data processing, remote control and data acquisition of various devices used for testing, leakage current, resistance leakage current, watt loss due to deterioration ( Lightning arrester long-term reliability inspection device, characterized in that the analysis can be stored.