JPS60120268A - Corona discharge detecting apparatus - Google Patents

Abstract

PURPOSE:To make it possible to easily detect the generation of corona by any operator, by displaying a corona generating pattern while automatically discriminating the same the estimating the discharge place and cause of corona on the basis of the generated pattern to display the same. CONSTITUTION:A gate pulse is generated at every 1/5 splitting of a commercial frequency power source 1 applied to a device 3 to be tested and five switch parts 10 is turned ON by 72 deg. in an electric angle at every 10 per one cycle. therefore by inputting a corona pulse signal from a corona wave forming part 9 to five switch parts 10, the discrimination of a phase condition for generating corona discharge and polarity is enabled. On the other hand, a phase condition during measurement is transmitted to a display part from a gate pulse generating part 13. In the display part 12, informations in regard to the phase relation of corona discharge with applied voltage, a number of corona pulses and a corona pulse level are displayed individually and the combined information thereof is compared with the data in a memory apparatus to display an estimated corona discharge location or a generation cause.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a device for detecting corona discharge that occurs when the electrical characteristics of an insulator used in a gas-insulated switchgear or the like is abnormal.

[Technical background of the invention and its problems] Conventionally, when testing the insulation condition of gas-insulated switchgear, etc., in order to detect corona discharge in the equipment under test,
The presence or absence of corona discharge is determined from information such as electrical noise, sound, and light that is generated. In addition, corona discharge can occur due to poor contact of the equipment under test, dirt on the insulator, voids in the insulator, protrusions on the high voltage or ground side, etc.
Depending on the conditions where the corona is generated, such as in the air, in oil, or insulating gas, a unique generation pattern can occur, so recognizing the discharge pattern is one of the most effective ways to find abnormal locations where corona discharge is occurring. It is one. This generation pattern can be recognized by the phase relationship with the applied voltage, polarity, number of corona pulses, corona level, etc., but currently these can only be recognized by a skilled worker. There is a need for a corona discharge detection device that can be easily operated by anyone.

[Object of the invention] The present invention is to automatically identify and display a corona generation pattern when a test device generates corona discharge, and to estimate and display the location or cause of corona discharge based on the generation pattern. Therefore, it is an object of the present invention to provide a corona discharge detection device that allows anyone to estimate the cause and location of corona occurrence.

[Summary of the Invention] The corona discharge detection device of the present invention includes a gate pulse generation section and a switch section that detect the phase relationship and polarity of corona discharge generated from a test device with an applied voltage, and a counter section that detects corona pulses. , a level discriminator that detects the corona pulse level, and a level discriminator that detects the corona pulse level, and a
It is equipped with a display section having a memory device that stores the cause and location of corona discharge occurrence, and displays the corona occurrence pattern detected by each of the sections on this display section, and at the same time displays the data in the memory device and the detected corona occurrence pattern. The purpose is to accurately estimate and display the cause and location of the coronavirus outbreak.

[Embodiments of the invention] An embodiment of the present invention will be described with reference to the drawings.

First, to show the configuration of this embodiment, reference numeral 1 in the figure is a power supply whose one side is grounded, and a coil 2 on the high voltage side of this power supply 1 for attenuating high frequency noise superimposed on the power supply.
is connected. A device under test 3 and a coupling capacitance 4 for detecting corona discharge are connected to the output side of the coil 2. The test device 3 is connected directly, and the coupling capacitance 4 is connected to the detection impedance 5 for corona detection.
are grounded through the respective terminals. The high voltage side of the detection impedance 5 is connected to a high band amplifier 6 and a gate pulse generator 13.
It is connected to the. Among these, the output of the high band amplifier 6 is inputted to a level discrimination section 7 for discriminating the corona level, and a level discrimination signal from a level discrimination signal generation section 8 is inputted to the level discrimination section 7. There is.

The output of the level discrimination section 7 is input to a waveform shaping section 9 that converts the corona pulse into a constant pulse width, and the output of this waveform shaping section 9 is turned ON depending on the measurement phase.

OF'' is input to the switch unit 10 that performs F. Further, the goo 1 generation layer 2 generation unit 13 connected to the detection impedance 5 is also connected to each switch unit 10,
It generates timing pulses to turn on and off the switches of these switch sections 10.

This switch section 10 is composed of five switch sections in this embodiment. The output of each switch section 10 is sent to each counter section 11 that counts corona pulses, and the output is inputted to the display section 12. Based on the input signal, the display section 12 displays the corona occurrence pattern and the location or cause of the corona occurrence. It looks like it will.

That is, the display section 12 has the function of directly displaying the phase relationship, polarity, number of corona pulses, corona pulse level, etc. of the applied voltage detected by the switch section, counter section, and level discrimination section, and also has the function of directly displaying the phase relationship, polarity, number of corona pulses, corona pulse level, etc. It is equipped with a storage device for data regarding Brahma patterns. This storage device stores in advance the location and cause of corona occurrence corresponding to a predetermined pattern of corona occurrence determined from conventional experience, and the display unit 12 displays the data in this storage device and the respective parts The system compares the corona occurrence pattern detected by the system and displays the location and cause of corona occurrence corresponding to that occurrence pattern.

Next, the operation of this embodiment having such a configuration will be explained.

A voltage corresponding to the test voltage is generated in the power supply 1, and this voltage is applied to the device under test 3 and the coupling capacitance 4 for detecting corona discharge through the coil 2 that attenuates the high frequency noise superimposed on the test voltage m1. let When a corona discharge occurs from the device under test 3, a corona pulse signal accompanying the corona discharge is generated in the detection impedance 5 connected to the ground side of the coupling capacitance 4. This corona pulse signal is transmitted to the high band amplifier 6, where it is amplified to an appropriate level, and the corona level is determined by comparing it with the level judgment signal input here in the level judgment section 7 at the next stage. be identified. The level information of the corona pulse signal identified by the level determination section 7 is transmitted to the display section 12 via the level determination signal generation section 8.

Thereafter, the waveform shaping section 9 converts the corona pulse signal into a pulse train with a constant pulse width and peak value, and sends this to each switch section 10. On the other hand, a commercial frequency component generated in the detection impedance 5 through the coupling capacitance 4 is transmitted to the gate pulse generation section 13. The gate pulse generated by the gate pulse generating section 13 turns on and off the five switch sections 10. That is, a gate pulse is generated every 5 divisions of one cycle of the commercial frequency power supply applied to the device under test, that is, every 72 degrees in electrical angle, and the gate pulses are generated once every 1 cycle of the five switch units 10. Turn it on at an electrical angle of 72 degrees.

Therefore, the corona waveform shaping section 9 is provided in the five switch sections 10.
By inputting the corona pulse signal from
It becomes possible to identify the phase conditions and polarity under which a single discharge occurs. On the other hand, the gate pulse generator 13 transmits the phase line ('l) being measured to the display unit 12.

The two and ten pulse signals that have passed through each switch section 10 are counted by a counter section 11 connected to each one, and the number of corona pulses is transmitted to a display section 12. The display unit 12 displays the phase relationship of the corona discharge with the applied voltage, the polarity, the number of corona pulses,
Individual information about the corona pulse level is displayed independently, and the combined information is compared with the data in the storage device to display the predicted location or cause of corona discharge.

That is, the display unit 12 has the functions of identifying 210 naval pulses, estimating the cause and location of corona occurrence, and displaying the contents, and is capable of identifying complex corona pulses of several 41 types. In order to do so, the characteristics of each pattern are stored as data in a storage device, and by comparing this with the corona pulse generated by the test device as described above, the cause of corona generation and the corona generation can be determined. Estimate location. Table 1 shows an example of the types of corona pulses and the cause and location of corona occurrence in the test device when each corona pulse occurs.The device of the present invention stores such information in the storage device. We will estimate the cause and location of the coronavirus outbreak.

[Effect of Light] As described above, according to the present invention, when a test device generates corona discharge, the pattern of corona generation can be automatically identified and displayed, and the place or cause of corona generation can be estimated and displayed. This has the effect of providing a corona detection device that can easily detect the occurrence of corona to anyone.

[Brief explanation of the drawing]

Figure 1 is a fruit of the present invention/Jl! FIG. 2 is a block diagram illustrating an example. 1...Power source, 2...Coil, 3...DUT, 4...
...Coupling capacitance, 5...Detection impedance, 6...High band amplifier, 7...Level discriminator, 8.
...Level discrimination signal light generation section, 9...Waveform shaping section, 10
...Switch section, 11...Counter section, 12...
Display section. 7317 Representative Patent Attorney Keisuke Norichika (and 1 other person) Figure 1

Claims (1)

[Scope of Claims] A gate pulse generation section and a switch section that detect the phase relationship and polarity of corona discharge generated from a test device with an applied voltage;
A counter section for detecting corona pulses, a level discriminating section for detecting corona pulse levels, and a display section that stores a storage device that stores the cause and location of corona discharge corresponding to the corona generation pattern in advance. The display section displays the corona occurrence pattern detected by each of the sections, and at the same time, the cause and location of the corona occurrence are determined and displayed by comparing the data in the storage device with the detected "rona occurrence pattern." FeaturesCorona discharge detection device.