CN110596545A - Partial discharge detection device and detection method based on combined action of alternating current and impulse voltage - Google Patents
Partial discharge detection device and detection method based on combined action of alternating current and impulse voltage Download PDFInfo
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- CN110596545A CN110596545A CN201910834494.6A CN201910834494A CN110596545A CN 110596545 A CN110596545 A CN 110596545A CN 201910834494 A CN201910834494 A CN 201910834494A CN 110596545 A CN110596545 A CN 110596545A
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- 238000001514 detection method Methods 0.000 title claims abstract description 24
- 238000012360 testing method Methods 0.000 claims abstract description 87
- 238000002955 isolation Methods 0.000 claims abstract description 18
- 238000005259 measurement Methods 0.000 claims abstract description 13
- 230000001960 triggered effect Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 abstract description 4
- 230000001629 suppression Effects 0.000 abstract description 3
- 238000010998 test method Methods 0.000 abstract 1
- 238000009413 insulation Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012512 characterization method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
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- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention discloses a partial discharge detection device with combined action of alternating current and impulse voltage and a test method thereof, wherein the device comprises a power frequency test transformer, an impulse voltage generator, an isolation spherical gap, a measurement impedance, two filters and an oscilloscope; the power frequency test transformer is connected with a test sample, the impulse voltage generator is connected with the test sample through an isolation spherical gap, the test sample is grounded through a measurement impedance, two ends of the measurement impedance are respectively connected with the oscilloscope through the filter, and the lengths of signal lines leading out signals at two ends of the measurement impedance are the same. The invention utilizes the combination of the power frequency voltage and the impulse voltage to act on the test sample, and carries out interference suppression by measuring the difference value of the partial discharge signals on the grounding wire and the impedance, thereby accurately obtaining the partial discharge signal of the test sample under the action of the power frequency impulse combination voltage. The partial discharge performance of the test sample tested by the method is more accurate.
Description
Technical Field
The invention relates to a partial discharge testing device, in particular to a partial discharge testing device with combined action of alternating current and impulse voltage and a testing method thereof.
Background
Gas combined electrical apparatus, transformer, etc. are the key power equipment in the electric wire netting, and it can suffer thunder and lightning overvoltage in the operation process, and thunder and lightning overvoltage is the overvoltage that nature formed, and it has amplitude height, the steep characteristics of wave form leading edge. In addition, these devices are subject to operational overvoltages during operation.
Partial discharge is an important characterization parameter of insulation degradation, hidden insulation defects can be effectively discovered through detection of the partial discharge, and treatment can be carried out before breakdown faults of equipment occur, so that the influence of equipment accidents on a power grid is avoided. Partial discharge detection under power frequency voltage has been studied for many years and has a relatively mature detection technology.
As described above, in the existing partial discharge testing technology, only the partial discharge performance of the electrical device/system under the action of the power frequency voltage is regarded as important, and how to accurately measure the partial discharge signal is a difficult point that can not be avoided by studying the above problems.
Disclosure of Invention
The purpose of the invention is as follows: in order to solve the problems, the invention provides a partial discharge detection device under the combined action of alternating current and impulse voltage and a detection method thereof.
The technical scheme is as follows: the technical scheme adopted by the invention is a partial discharge detection device with combined action of alternating current and impulse voltage, which comprises:
the power frequency test transformer is connected with the test sample and used for generating a power frequency voltage signal and applying the power frequency voltage signal to the test sample;
the impulse voltage generator is connected with the test sample and used for generating an impulse voltage signal and applying the impulse voltage signal to the test sample;
measuring impedance, wherein one end of the impedance is connected with the test sample, and the other end of the impedance is grounded;
the oscillograph is connected with two ends of the measuring impedance and used for leading out partial discharge signals from the two ends of the measuring impedance to carry out differential operation and display; the partial discharge signal of the test sample is generated by applying voltage on the test sample by the power frequency test transformer and the impulse voltage generator.
Optionally, the apparatus further comprises: an isolating spherical gap for protecting the surge voltage generator, the isolating spherical gap being connected in series between a test sample and the surge voltage generator.
The isolation ball gap is a controllable ball gap which is triggered simultaneously with the ball gap in the impulse voltage generator.
Optionally, the apparatus further comprises: the isolation resistor is used for protecting the power frequency test transformer, and the power frequency test transformer is connected with the test sample through the isolation resistor.
Optionally, the apparatus further comprises: an overvoltage suppressor for protecting a measurement impedance, the overvoltage suppressor being connected in parallel with the measurement impedance; when the surge voltage exceeds an operation threshold of the overvoltage suppressor, the overvoltage suppressor becomes a short-circuit state.
The overvoltage suppressor is a piezoresistor type overvoltage suppressor.
Optionally, the apparatus further comprises: and the measuring impedance is connected with the oscilloscope through the high-pass filter. Wherein, the length of the signal wires for leading out the signals at the two ends of the measuring impedance is the same.
Further, the high-pass filter comprises a filter 1 and a filter 2, one end of the measurement impedance is connected with one end of the oscilloscope through the filter 1, and the other end of the measurement impedance is connected with the other end of the oscilloscope through the filter 2. Wherein, the length of the signal wires for leading out the signals at the two ends of the measuring impedance is the same.
The invention also provides a partial discharge detection method, which comprises the following steps:
the power frequency test transformer outputs a power frequency voltage signal which is continuously applied to a test sample;
on the basis of continuously applying power frequency voltage, an impulse voltage generator generates impulse voltage which is applied to a test sample, and at the moment, the alternating current power frequency voltage and the impulse voltage are jointly used on the test sample;
and acquiring voltage signals at two ends of the measuring impedance by the oscilloscope, carrying out differential operation on the two paths of signals to obtain a partial discharge signal, and reading out the signal intensity to be used as a partial discharge characteristic value of the test sample.
Has the advantages that: compared with the prior art, the invention has the advantages that: (1) the partial discharge performance of the test sample is tested by combining alternating current and impulse voltage, so that the insulation performance of the test sample can be more accurately reflected; (2) in the detection process, the alternating voltage and the impulse voltage jointly act on a test article, and the influence of the impulse voltage on the lifting action of the ground potential and various high-frequency interferences is eliminated by inhibiting the interference of the difference value of the voltage signals on the measurement grounding wire and the measurement impedance, so that the accuracy of the partial discharge signal test is improved; (3) and the isolation resistor and the isolation ball gap are adopted to prevent the mutual influence of the power frequency voltage and the impulse voltage.
Drawings
Fig. 1 is a schematic structural diagram of a partial discharge test detection device according to the present invention.
Detailed Description
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
The inventor notices in the process of invention that:
at present, partial discharge detection under the impulse voltage is less, the detection difficulty of the partial discharge under the impulse voltage is interference suppression, and the impulse voltage generator adopts spherical gap discharge to generate a waveform, which has great influence on the accuracy of detection, so that the partial discharge characteristic of the electrical equipment under the impulse voltage is difficult to study.
The prior art generally considers the impact voltage as a single factor to examine the reliability influence on the electrical equipment, and does not realize that the combined action of the power frequency voltage and the impact voltage can also produce unexpected influence on the partial discharge performance of the equipment.
Therefore, the existing partial discharge testing technology has no relevant research on the problem of testing the partial discharge performance of the power equipment by combining the power frequency voltage and the impulse voltage, and because the impulse voltage can cause ground potential lifting and various high-frequency interferences, complex interference signals are easily generated, and the partial discharge signal detection is more complex under the condition.
The partial discharge detection device with combined action of alternating current and impulse voltage is shown in figure 1 and comprises:
the device comprises a power frequency test transformer, an isolation resistor, an impulse voltage generator, an isolation ball gap, a measuring impedance, an overvoltage suppressor, a filter and an oscilloscope.
The invention adopts a power frequency test transformer and an impulse voltage generator as excitation voltages. The power frequency test transformer is connected with a mains supply and can generate a power frequency voltage signal with adjustable amplitude, and the impulse voltage generator can generate an impulse voltage signal with adjustable amplitude and waveform parameters. A large resistor is connected in series between a power frequency test transformer and a test sample (hereinafter referred to as a test sample) to serve as an isolation resistor for preventing the impact voltage generated by an impact voltage generator from invading a power frequency power supply; an isolation ball gap is connected in series between the impulse voltage generator and the test sample to prevent the intrusion of the power frequency voltage to the impulse power supply. Specifically, a large resistor is connected in series between the test sample and the power frequency test transformer, in this example, a 50M ohm resistor is selected as the isolation resistor, and the isolation resistor is used to prevent the impact voltage from being applied to the test sample and the power frequency test transformer to cause the damage of the transformer. A controllable ball gap is connected in series between the test sample and the impulse voltage generator to serve as an isolation ball gap, and the ball gap can be simultaneously triggered with the ball gap of the impulse voltage generator to prevent the power frequency voltage from acting on the impulse voltage generator and damage to the impulse voltage generator. The power frequency and the impulse voltage are jointly applied to a test article, and the test article can be an oil paper insulation test model aiming at a transformer and can also be a gas insulation test model aiming at a gas insulation combined electrical apparatus. The sample can be a transformer or a GIS, and can also be other products, and the type is not limited. A50 ohm resistor is connected with the test article in series to serve as measuring impedance for measuring partial discharge signals, in addition, in order to avoid influence of impulse voltage signals on the measuring impedance, an overvoltage suppressor is connected with the measuring impedance in parallel, the overvoltage suppressor selects a piezoresistor type overvoltage suppressor, when the voltage exceeds a certain amplitude, the overvoltage suppressor is represented as a short circuit, the phenomenon that overhigh voltage is applied to the measuring impedance can be avoided, and the measuring impedance is prevented from being damaged by overvoltage. Obtaining a partial discharge signal generated by a test article on the measured impedance, and connecting the partial discharge signal to an oscilloscope through a high-pass filter; meanwhile, a signal is obtained on the grounding wire and is connected to the oscilloscope through the high-pass filter. And carrying out differential calculation on the two paths of signals to obtain partial discharge signals, and storing and displaying the partial discharge signals. As shown in fig. 1, two identical high-pass filters, filter 1 and filter 2, may be used to filter the two signals.
Because the potential of the ground is increased under the impact voltage and the spark effect also forms discharge on the grounding point, the interference on the local discharge signal is caused, in order to avoid the interference, a signal is led out from the measuring impedance and is connected to the oscilloscope through a high-pass filter, and the high-pass filter can adopt a filter with the cut-off frequency of 800 kHz. Meanwhile, a signal is also led out from the grounding point, and is also connected to the oscilloscope through the high-pass filter, and the length of the signal wire leading out the measurement impedance is consistent with that of the grounding point. The lengths of the signal lines are consistent, so that the two paths of signals have an interference suppression effect after being differentiated. And performing differential operation on the two paths of signals in the oscilloscope to obtain partial discharge signals.
The working principle of the partial discharge detection device is as follows: the power frequency voltage continuously acts on the test piece, when the combined voltage is required to act, the triggering spherical gap inside the impulse voltage generator and the isolating spherical gap outside the impulse voltage generator are triggered, and the impulse voltage acts on the test piece and forms the combined voltage with the power frequency voltage to act on the test piece simultaneously. The test article can produce partial discharge under the effect of joint voltage, and the partial discharge signal of test article under the effect of power frequency impact joint voltage can be accurately obtained by measuring the difference of voltage signals on the grounding wire and the measuring impedance to suppress interference. In order to prevent the damage of the surge voltage to the measuring impedance, an overvoltage suppressor is adopted to be connected with the measuring impedance in parallel, when the surge voltage exceeds the action threshold value of the overvoltage suppressor, the overvoltage suppressor is in a short-circuit state, the voltage applied to the measuring impedance is zero at the moment, and the damage of the overvoltage to the measuring impedance is avoided. The overvoltage suppressor may be parametrically selected based on the actual magnitude of the applied voltage. In actual test detection, each parameter can be flexibly adjusted according to needs, the parameters of the impulse voltage generator and the types of the test articles can be selected according to needs, and the parameters of the overvoltage suppressor and the filter can be selected according to actual conditions.
The invention also provides a partial discharge detection method under the combined action of alternating current and impulse voltage, which comprises the following test steps:
(1) the power frequency voltage signal is output by the power frequency test transformer and continuously applied to the test sample, and the voltage amplitude can be correspondingly set according to the type of the test sample.
(2) The cut-off frequency of the high-pass filter is set to be 800kHz, an impulse voltage is generated through an impulse voltage generator, an isolation ball gap is triggered and applied to a test sample, at the moment, the alternating current power frequency voltage and the impulse voltage are combined and used on the test sample, and the overvoltage suppressor sets an action threshold to be 150% of the test voltage after the power frequency and the impulse voltage are added; the voltage amplitude and waveform parameters of the impulse voltage can be set arbitrarily according to requirements.
(3) The oscilloscope collects voltage signals on the ground wire and the measuring impedance after being filtered by the filter, performs differential operation on the two paths of signals to obtain partial discharge signals, and reads out the signal intensity to be used as the partial discharge characteristic value of the test article.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A partial discharge detection device with combined action of alternating current and impulse voltage is characterized in that: the device includes:
the power frequency test transformer is connected with the test sample and used for generating a power frequency voltage signal and applying the power frequency voltage signal to the test sample;
the impulse voltage generator is connected with the test sample and used for generating an impulse voltage signal and applying the impulse voltage signal to the test sample;
measuring impedance, wherein one end of the impedance is connected with the test sample, and the other end of the impedance is grounded;
the oscillograph is connected with two ends of the measuring impedance and used for leading out partial discharge signals from the two ends of the measuring impedance to carry out differential operation and display; the partial discharge signal is generated by applying voltage on a test sample by the power frequency test transformer and the impulse voltage generator.
2. The apparatus for detecting partial discharge with combined ac and surge voltage according to claim 1, wherein: the device also includes: an isolating spherical gap for protecting the surge voltage generator, the isolating spherical gap being connected in series between a test sample and the surge voltage generator.
3. The apparatus for detecting partial discharge with combined ac and surge voltage according to claim 2, wherein: the isolation ball gap is a controllable ball gap which is triggered simultaneously with the ball gap inside the impulse voltage generator.
4. The apparatus for detecting partial discharge with combined ac and surge voltage according to claim 1, wherein: the device also includes: the isolation resistor is used for protecting the power frequency test transformer, and the power frequency test transformer is connected with the test sample through the isolation resistor.
5. The apparatus for detecting partial discharge with combined ac and surge voltage according to claim 1, wherein: the device also includes: an overvoltage suppressor for protecting a measurement impedance, the overvoltage suppressor being connected in parallel with the measurement impedance; when the surge voltage exceeds an operation threshold of the overvoltage suppressor, the overvoltage suppressor becomes a short-circuit state.
6. The apparatus for detecting partial discharge with combined ac and surge voltage according to claim 5, wherein: the overvoltage suppressor is a piezoresistor type overvoltage suppressor.
7. The apparatus for detecting partial discharge with combined ac and surge voltage according to claim 1, wherein: the device also includes: and the measuring impedance is connected with the oscilloscope through the high-pass filter.
8. The apparatus for detecting partial discharge with combined ac and surge voltage according to claim 7, wherein: the high-pass filter comprises a filter 1 and a filter 2, one end of the measuring impedance is connected with one end of the oscilloscope through the filter 1, and the other end of the measuring impedance is connected with the other end of the oscilloscope through the filter 2.
9. The apparatus for detecting partial discharge with combined ac and surge voltage according to claim 7 or 8, wherein: the length of the signal wires for leading out signals at two ends of the measuring impedance is the same.
10. A partial discharge detection method, characterized in that it comprises the steps of:
the power frequency test transformer outputs a power frequency voltage signal which is continuously applied to a test sample;
on the basis of continuously applying power frequency voltage, an impulse voltage generator generates impulse voltage which is applied to a test sample, and at the moment, the alternating current power frequency voltage and the impulse voltage are jointly used on the test sample;
and acquiring voltage signals at two ends of the measuring impedance by the oscilloscope, carrying out differential operation on the two paths of signals to obtain a partial discharge signal, and reading out the signal intensity to be used as a partial discharge characteristic value of the test sample.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111323685A (en) * | 2020-04-09 | 2020-06-23 | 英大电力装备有限公司 | Partial discharge detection and analysis device |
| CN115047302A (en) * | 2022-08-15 | 2022-09-13 | 国网江西省电力有限公司电力科学研究院 | Cable series resonance partial discharge detection system and method based on double transformers |
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