CN113608083A - PD pulse current, ultrahigh frequency and ultrasonic synchronous monitoring system and method for transformer alternating current withstand voltage test - Google Patents
PD pulse current, ultrahigh frequency and ultrasonic synchronous monitoring system and method for transformer alternating current withstand voltage test Download PDFInfo
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- CN113608083A CN113608083A CN202110904045.1A CN202110904045A CN113608083A CN 113608083 A CN113608083 A CN 113608083A CN 202110904045 A CN202110904045 A CN 202110904045A CN 113608083 A CN113608083 A CN 113608083A
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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
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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
- G01R31/08—Locating faults in cables, transmission lines, or networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The invention relates to the technical field of transformers, in particular to a synchronous detection system of a transformer, which comprises an alternating-current high-voltage test control device, an alternating-current test high-voltage power supply, a capacitive voltage divider, a test sample transformer, a built-in ultrahigh frequency/ultrasonic wave integrated composite sensor, detection impedance, a multi-channel high-speed acquisition device and a storage transmission device, wherein the alternating-current high-voltage test control device comprises a display module and a storage module.
Description
Technical Field
The invention relates to the technical field of transformers, in particular to a system and a method for synchronously monitoring PD pulse current, ultrahigh frequency and ultrasonic wave in an alternating current withstand voltage test of a transformer.
Background
Through years of practice, aiming at an interference source which may appear during detection based on a traditional pulse current method Partial Discharge (PD) test, an alternating current withstand voltage (PD) test of a transformer (see figure 1) can be smoothly carried out under a factory test, namely a laboratory condition, by utilizing a traditional pulse current PD detection method (a broadband or narrow-band method, wherein the detection frequency band is within 1 MHz) recommended by the GB/T7354 standard; however, for field handover and fault diagnosis tests, the working conditions that interference pulse signals are difficult to eliminate under a complex electromagnetic background still exist. In addition, operation experience shows that the transformer subjected to the traditional pulse current PD test of alternating-current withstand voltage still has the case that insulation failure or even explosion occurs soon after operation to cause fire.
The measurement of PD is based on various phenomena caused by PD, and the state of PD is characterized by physical quantities that can express the phenomena. The PD process is accompanied by transfer of electric charge and loss of electric energy, and also by generation of pulse current, electromagnetic radiation, ultrasonic waves, luminescence, heat generation, appearance of new products, and the like. Therefore, in response to these phenomena, the detection method of partial discharge includes a high-frequency method, an ultrahigh-frequency method, an ultrasonic method, a photometric method, and the like in addition to the above-described conventional pulse current method.
Relevant researches show that signals with different properties generated by synchronously monitoring insulation defects PD in the transformer can be used for anti-interference, insulation state risk assessment, life prediction and the like. However, the system and the method for carrying out the alternating current withstand voltage test of the transformer by combining the traditional pulse current PD detection method recommended by the current standard are lacked.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a synchronous detection system and a synchronous detection method for a transformer, which are more effective and more comprehensive in evaluating the insulation state of the transformer than the traditional pulse current PD detection recommended by the field standard.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme: a PD pulse current, ultrahigh frequency and ultrasonic wave synchronous monitoring system for an alternating current voltage withstand test of a transformer comprises an alternating current high voltage test control device, an alternating current test high voltage power supply, a capacitive voltage divider, a test sample transformer, a built-in ultrahigh frequency/ultrasonic wave integrated composite sensor, a detection impedance, a multi-channel high-speed acquisition device and a storage transmission device, wherein the alternating current high voltage test control device comprises a display module and a storage module;
the alternating current high-voltage test control device is in communication connection with the alternating current test high-voltage power supply, the multi-channel high-speed acquisition device and the storage transmission device through optical cables, controls and displays the voltage output and the real-time waveform of the alternating current test high-voltage power supply through the display module and the storage module, and receives pulse waveform-time sequences of three signals, namely pulse current, ultrahigh frequency and ultrasonic wave, sent by the multi-channel high-speed acquisition device and the storage transmission device and real-time voltage waveform parameters from the low-voltage side of the capacitive voltage divider.
Further, the alternating current test high-voltage power supply is improved in that the alternating current test high-voltage power supply can output 0-1000 kV alternating voltage through program control, the output high voltage HV is applied to the capacitive voltage divider and the test transformer, the control effect of the alternating current test high-voltage power supply is improved, and the use stability is improved.
Furthermore, the improved capacitive voltage divider adopts a capacitive series voltage divider, the voltage level is 1000kV, the AC precision is 1.0%, the capacity is 100pF, and the use effect of the capacitive voltage divider is improved.
Furthermore, the invention has the improvement that the sample transformer is a large-scale power transformer or a converter transformer, an oil valve is arranged in the sample transformer, and the built-in ultrahigh frequency/ultrasonic wave integrated composite sensor is arranged in the oil valve, so that the use stability of the sample transformer is improved, and the service life of the sample transformer is prolonged.
Further, the invention has the improvement that the built-in ultrahigh frequency/ultrasonic wave integrated composite sensor is an integrated composite sensor which is installed based on an oil valve in an intrusive mode, has ultrahigh frequency and ultrasonic wave synchronous monitoring and independently works and outputs, so that the sensing accuracy is improved.
The invention further improves that the detection impedance is composed of a non-inductive resistor parallel protection device, the detection sensitivity is 0.5pC, the measurement bandwidth of 3dB is 10 kHz-1 MHz, and the performance requirement of pulse waveform-time sequence detection by the pulse current method recommended by the current standard is met.
Further, the invention is improved in that the multi-channel high-speed acquisition device and the storage transmission device are provided with 3 PD channels and 1 voltage V measurement channel, and the 3 PD channels are respectively a pulse current PD channel, an ultrahigh frequency PD channel and an ultrasonic PD channel.
A PD pulse current, ultrahigh frequency and ultrasonic wave synchronous monitoring method for a transformer alternating current withstand voltage test comprises the following steps:
firstly, a 10 kHz-1 MHz band-pass filter is connected to the front end of a pulse current PD channel to filter power frequency interference and useless high-frequency signals, the input impedance is 50 omega, the input impedance is well matched with a signal transmission cable, and the sampling rate is 10 MS/s;
secondly, a 300 MHz-1500 MHz band-pass filter is connected to the front end of the ultrahigh frequency PD channel, the input impedance is 50 omega, the ultrahigh frequency PD channel is well matched with a signal transmission cable, and the sampling rate is 5 GS/s;
thirdly, a 30 kHz-500 kHz band-pass filter is connected to the front end of the ultrasonic PD channel, the input impedance is 50 omega, the ultrasonic PD channel is well matched with a signal transmission cable, and the sampling rate is 5 MS/s;
step four, the voltage V channel is connected with a low-voltage signal of the voltage divider, and impedance is input to be 1M omega;
and step five, the self-storage function of the pulse waveform-time sequence and the voltage waveform of the 3 different sub-signals is provided, and real-time or historical data can be transmitted according to whether the communication is carried out with the alternating current high voltage test control, display and storage module.
Furthermore, the invention has the improvement that the acquisition length of 3 PD channels can be artificially set to be 1-5 mus for adapting to pulse waveforms with different lengths;
the pulse current PD channel is a trigger channel, and the positive polarity and the negative polarity are in a trigger type (rising edge or falling edge);
the triggering threshold is the minimum peak value of the collected PD current pulse waveform.
(III) advantageous effects
Compared with the prior art, the invention provides a system and a method for synchronously monitoring PD pulse current, ultrahigh frequency and ultrasonic wave in a transformer alternating current withstand voltage test, and the system and the method have the following beneficial effects:
the invention provides a PD pulse current, ultrahigh frequency and ultrasonic synchronous monitoring system and method for an alternating current withstand voltage test of a transformer, and provides an advanced technology for more effectively and comprehensively evaluating the insulation state of the transformer compared with the traditional pulse current PD detection recommended by the field standard for providing factory tests, field handover tests or fault diagnosis tests for alternating current and current conversion of large power transformers.
Drawings
FIG. 1 is a table of implementation strategies for insulation state evaluation of a large power transformer according to the present invention;
FIG. 2 is a schematic structural view of the present invention;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the invention relates to a PD pulse current, ultrahigh frequency and ultrasonic synchronous monitoring system for transformer ac voltage withstand test, which comprises an ac high voltage test control device, an ac test high voltage power supply, a capacitive voltage divider, a test transformer, a built-in ultrahigh frequency/ultrasonic integrated composite sensor, a detection impedance, a multi-channel high-speed acquisition device and a storage and transmission device, wherein the ac high voltage test control device comprises a display module and a storage module;
the alternating current high-voltage test control device is in communication connection with the alternating current test high-voltage power supply, the multi-channel high-speed acquisition device and the storage transmission device through optical cables, controls and displays the voltage output and the real-time waveform of the alternating current test high-voltage power supply through the display module and the storage module, and receives pulse waveform-time sequences of three signals, namely pulse current, ultrahigh frequency and ultrasonic wave, sent by the multi-channel high-speed acquisition device and the storage transmission device and real-time voltage waveform parameters from the low-voltage side of the capacitive voltage divider.
In the embodiment, the alternating current test high-voltage power supply can output 0-1000 kV alternating voltage through program control, and the output high voltage HV is applied to the capacitive voltage divider and the test transformer, so that the control effect of the alternating current test high-voltage power supply is improved, and the use stability is improved.
In this embodiment, the capacitive voltage divider adopts a capacitive series voltage divider, the voltage level is 1000kV, the AC precision is 1.0%, and the capacity is 100pF, so that the use effect of the capacitive voltage divider is improved.
In this embodiment, the sample transformer is a large power transformer or a converter transformer, an oil valve is arranged in the sample transformer, and the built-in ultrahigh frequency/ultrasonic wave integrated composite sensor is installed in the oil valve, so that the use stability of the sample transformer is improved, and the service life of the sample transformer is prolonged.
In this embodiment, the built-in ultrahigh frequency/ultrasonic wave integrated composite sensor is an integrated composite sensor which is installed based on an oil valve intrusion type, has ultrahigh frequency and ultrasonic wave synchronous monitoring, and works and outputs independently, so that the sensing accuracy is improved.
In the embodiment, the detection impedance is composed of a non-inductive resistor parallel protection device, the detection sensitivity is 0.5pC, the 3dB bandwidth is measured at 10 kHz-1 MHz, and the performance requirement of pulse waveform-time sequence detection by the current standard recommended pulse current method is met.
In this embodiment, the multi-channel high-speed acquisition device and the storage and transmission device have 3 PD channels and 1 voltage V measurement channel, and the 3 PD channels are a pulse current PD channel, an ultrahigh frequency PD channel, and an ultrasonic PD channel, respectively.
A PD pulse current, ultrahigh frequency and ultrasonic wave synchronous monitoring method for a transformer alternating current withstand voltage test comprises the following steps:
firstly, a 10 kHz-1 MHz band-pass filter is connected to the front end of a pulse current PD channel to filter power frequency interference and useless high-frequency signals, the input impedance is 50 omega, the input impedance is well matched with a signal transmission cable, and the sampling rate is 10 MS/s;
secondly, a 300 MHz-1500 MHz band-pass filter is connected to the front end of the ultrahigh frequency PD channel, the input impedance is 50 omega, the ultrahigh frequency PD channel is well matched with a signal transmission cable, and the sampling rate is 5 GS/s;
thirdly, a 30 kHz-500 kHz band-pass filter is connected to the front end of the ultrasonic PD channel, the input impedance is 50 omega, the ultrasonic PD channel is well matched with a signal transmission cable, and the sampling rate is 5 MS/s;
step four, the voltage V channel is connected with a low-voltage signal of the voltage divider, and impedance is input to be 1M omega;
and step five, the self-storage function of the pulse waveform-time sequence and the voltage waveform of the 3 different sub-signals is provided, and real-time or historical data can be transmitted according to whether the communication is carried out with the alternating current high voltage test control, display and storage module.
In the embodiment, the acquisition length of the 3 PD channels can be artificially set to be 1-5 mus, and the acquisition length is used for adapting to pulse waveforms with different lengths;
the pulse current PD channel is a trigger channel, and the positive polarity and the negative polarity are in a trigger type (rising edge or falling edge);
the triggering threshold is the minimum peak value of the collected PD current pulse waveform.
In summary, the transformer synchronous detection system and method perform an execution strategy for insulation state evaluation of a large power transformer according to the measurement results of pulse waveform-time (phase) sequences of three signals when in use, as shown in fig. 1:
working condition 1: the PD value of the pulse current method is smaller than a standard value, if the ultrahigh frequency has signals but the ultrasonic wave has no signals, the transformer can be put into operation, but the insulation state needs to be regularly tracked;
working condition 2: the PD value of the pulse current method is smaller than the standard value, and the ultrahigh frequency and the ultrasonic wave have signals, so that the transformer can be put into operation, but the insulation state needs to be tracked in real time;
working condition 3: the PD value of the pulse current method is smaller than the standard value, and if the ultrahigh frequency and the ultrasonic wave have no signals, the transformer can be put into operation, but the insulation state is in a healthy state;
working condition 4: the PD value of the pulse current method is smaller than a standard value, if the ultrahigh frequency has no signal but the ultrasonic wave has a signal, the transformer can be put into operation, but the insulation state needs to be regularly tracked;
working condition 5: the PD value of the pulse current method is larger than a standard value, if the ultrahigh frequency has signals but the ultrasonic wave has no signals, the transformer cannot be put into operation, and the insulation state is in a medium fault and needs to be maintained;
working condition 6: the PD value of the pulse current method is larger than the standard value, and if the ultrahigh frequency and the ultrasonic wave have signals, the transformer cannot be put into operation, and the insulation state is in serious failure and needs to be maintained;
working condition 7: the PD value of the pulse current method is larger than the standard value, and the ultrahigh frequency and the ultrasonic wave have no signals, so that the transformer cannot be put into operation, and the insulation state is in a common fault and needs to be maintained;
working condition 8: the PD value of the pulse current method is larger than a standard value, no signal exists at ultrahigh frequency, but a signal exists at ultrasonic wave, the transformer cannot be put into operation, the insulation state is in medium fault, and maintenance is needed.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A transformer synchronous detection system is characterized by comprising an alternating-current high-voltage test control device, an alternating-current test high-voltage power supply, a capacitive voltage divider, a test sample transformer, a built-in ultrahigh frequency/ultrasonic wave integrated composite sensor, a detection impedance, a multi-channel high-speed acquisition device and a storage transmission device, wherein the alternating-current high-voltage test control device comprises a display module and a storage module;
the alternating current high-voltage test control device is in communication connection with the alternating current test high-voltage power supply, the multi-channel high-speed acquisition device and the storage transmission device through optical cables, controls and displays the voltage output and the real-time waveform of the alternating current test high-voltage power supply through the display module and the storage module, and receives pulse waveform-time sequences of three signals, namely pulse current, ultrahigh frequency and ultrasonic wave, sent by the multi-channel high-speed acquisition device and the storage transmission device and real-time voltage waveform parameters from the low-voltage side of the capacitive voltage divider.
2. The transformer synchronous detection system according to claim 1, wherein the alternating current test high voltage power supply is a non-partial discharge alternating current test high voltage power supply capable of outputting an alternating current voltage of 0-1000 kV through program control, and the output high voltage HV is applied to the capacitive voltage divider and the test transformer.
3. The transformer synchronous detection system of claim 1, wherein the capacitive voltage divider is a capacitive series voltage divider with a voltage level of 1000kV, AC accuracy of 1.0%, and capacity of 100 pF.
4. The transformer synchronous detection system of claim 1, wherein the sample transformer is a large power transformer or a converter transformer, an oil valve is arranged in the sample transformer, and the built-in ultrahigh frequency/ultrasonic wave integrated composite sensor is installed in the oil valve.
5. The synchronous detection system for the transformer according to claim 1 or 4, wherein the built-in ultrahigh frequency/ultrasonic wave integrated composite sensor is an integrated composite sensor which is based on oil valve invasive installation, has ultrahigh frequency and ultrasonic wave synchronous monitoring, and is operated independently and output.
6. The transformer synchronous detection system of claim 1, wherein the detection impedance is composed of a non-inductive resistor parallel protection device, the detection sensitivity is 0.5pC, and the measurement 3dB bandwidth is 10kHz to 1 MHz.
7. The transformer synchronous detection system according to claim 1, wherein the multi-channel high-speed acquisition device and the storage and transmission device have 3 PD channels and 1 voltage V measurement channel, and the 3 PD channels are a pulse current PD channel, an ultrahigh frequency PD channel, and an ultrasonic PD channel, respectively.
8. The transformer synchronous detection method according to claim 1, characterized by comprising the following steps:
firstly, a 10 kHz-1 MHz band-pass filter is connected to the front end of a pulse current PD channel to filter power frequency interference and useless high-frequency signals, the input impedance is 50 omega, the input impedance is well matched with a signal transmission cable, and the sampling rate is 10 MS/s;
secondly, a 300 MHz-1500 MHz band-pass filter is connected to the front end of the ultrahigh frequency PD channel, the input impedance is 50 omega, the ultrahigh frequency PD channel is well matched with a signal transmission cable, and the sampling rate is 5 GS/s;
thirdly, a 30 kHz-500 kHz band-pass filter is connected to the front end of the ultrasonic PD channel, the input impedance is 50 omega, the ultrasonic PD channel is well matched with a signal transmission cable, and the sampling rate is 5 MS/s;
step four, the voltage V channel is connected with a low-voltage signal of the voltage divider, and impedance is input to be 1M omega;
and step five, the self-storage function of the pulse waveform-time sequence and the voltage waveform of the 3 different sub-signals is provided, and real-time or historical data can be transmitted according to whether the communication is carried out with the alternating current high voltage test control, display and storage module.
9. The synchronous detection method of the transformer according to claim 8, wherein the acquisition length of 3 PD channels is artificially set to 1-5 μ s for adapting to pulse waveforms of different lengths;
the pulse current PD channel is a trigger channel, and the positive polarity and the negative polarity are in a trigger type (rising edge or falling edge);
the triggering threshold is the minimum peak value of the collected PD current pulse waveform.
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| CN109541413A (en) * | 2018-12-20 | 2019-03-29 | 国网上海市电力公司 | GIS partial discharge superfrequency, ultrasonic wave, light pulse combined detection system and method |
| CN112557985A (en) * | 2020-11-27 | 2021-03-26 | 国网上海市电力公司 | Test system for verifying pulse group separation technology by adopting pulse generator |
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2021
- 2021-08-06 CN CN202110904045.1A patent/CN113608083A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19990025593A (en) * | 1997-09-13 | 1999-04-06 | 이종규 | Partial discharge on-line diagnostic system |
| CN107728030A (en) * | 2017-11-14 | 2018-02-23 | 国网上海市电力公司 | Partial-discharge ultrahigh-frequency, ultrasonic wave, light pulse combined detection system and method |
| CN207717918U (en) * | 2017-11-14 | 2018-08-10 | 国网上海市电力公司 | Pulse current of PD wide band detection system |
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