CN112034309B - Partial discharge identification method for high-voltage switch cabinet - Google Patents
Partial discharge identification method for high-voltage switch cabinet Download PDFInfo
- Publication number
- CN112034309B CN112034309B CN202010739929.1A CN202010739929A CN112034309B CN 112034309 B CN112034309 B CN 112034309B CN 202010739929 A CN202010739929 A CN 202010739929A CN 112034309 B CN112034309 B CN 112034309B
- Authority
- CN
- China
- Prior art keywords
- partial discharge
- switch cabinet
- voltage
- signal
- sampling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention discloses a partial discharge identification method for a high-voltage switch cabinet, belonging to the technical field of live-line detection of high-voltage equipment. Firstly, a module (1) for measuring frequency and phase of voltage of a switch cabinet is connected with a square wave generating device (2); the transient ground voltage sensor (3) is fixed on the high-voltage switch cabinet, and the partial discharge measurement system (4) is connected with the transient ground voltage sensor (3); collecting partial discharge signals of the operating high-voltage switch cabinet; specifically, a superimposed square wave form is adopted, a partial discharge signal of the switch cabinet is acquired through a transient ground voltage sensor, whether the partial discharge signal is a discharge signal or not is judged according to the characteristics of the tested signal, and the position of partial discharge is analyzed; the invention solves the problems of large interference signal and difficult correct identification in the partial discharge detection of the high-voltage switch cabinet at present; partial discharge which can endanger insulation safety exists in the switch cabinet, and the switch cabinet has important significance for timely overhauling and finding insulation weak links.
Description
Technical Field
The invention belongs to the technical field of live-line detection of high-voltage equipment, and particularly relates to a partial discharge identification method for a high-voltage switch cabinet.
Background
The switch cabinet is a widely used switch device, and the accident rate of the switch cabinet is relatively high due to various problems in design, manufacture, operation, maintenance and the like. In a power distribution network, a switch cabinet runs in severe environments such as high temperature, high voltage and humidity for a long time, and the insulativity of the switch cabinet is easily damaged, so that partial discharge is caused. The method has the advantages of monitoring the partial discharge of the switch cabinet, diagnosing the insulation fault accurately in an early stage, reducing the equipment accident loss and unplanned shutdown, enhancing the operation capacity, and improving the equipment operation and maintenance management level, and has very important significance.
When partial discharge possibly endangering insulation safety exists in a switch cabinet, the partial discharge is determined by adopting a proper method, the method has important significance for timely overhauling and finding insulation weak links, the current means for accurately judging the partial discharge is lacked, in the current high-voltage switch cabinet partial discharge detection, interference signals are large and difficult to correctly identify, and the success rate of identifying discharge and interference is not high.
Disclosure of Invention
The invention aims to provide a partial discharge identification method for a high-voltage switch cabinet; the method is characterized in that a module 1 for measuring frequency and phase of voltage of a switch cabinet is connected with a square wave generating device 2; the transient ground voltage sensor 3 is fixed on the high-voltage switch cabinet, and the partial discharge measurement system 4 is connected with the transient ground voltage sensor 3; collecting partial discharge signals of the operating high-voltage switch cabinet; specifically, a superimposed square wave form is adopted, a partial discharge signal of the switch cabinet is acquired through a transient ground voltage sensor, whether the partial discharge signal is a discharge signal or not is judged according to the characteristics of the tested signal, and the position of partial discharge is analyzed; the method specifically comprises the following steps:
step 1: under the condition of live operation of the switch cabinet, detecting signals by using a transient earth voltage sensor and a local discharge measuring system, and setting the maximum amplitude of the absolute value of the detected signals as Y;
step 2: acquiring the change condition of sinusoidal voltage of high-voltage electricity of the switch cabinet along with time, calculating the frequency f and the phase A of the sinusoidal voltage, shaping to generate square signals with the same frequency f (unit is Hz) and the same phase A, wherein the high level of the square signals is 1-10V, and the low level of the square signals is 0;
and step 3: injecting the square wave signal to the ground on the shell of the switch cabinet, wherein the ground is the same as the ground of the output signal of the transient voltage sensor in the step 1;
and 4, step 4: detecting signals by using the same sensor and measuring system as in the step 1;
and 5: sampling the test signal obtained in the step (4), wherein the signal value of each time point after sampling is called as sampling data, and the total time length of sampling is not less than 10 seconds and is an integral multiple of the reciprocal of the f in the step (2);
step 6: dividing the total time of the sampling in the step 4 into n time segments with the length of 10 microseconds from the time point of starting timing of measurement, wherein the number of the time segments is n-1, 2 and 3 … … in sequence;
and 7: sampling the amplitude of the absolute value of the measured signal in each time period, if the amplitude of one absolute value is higher than Y/2, then all data in the time period is called a valid pulse, recording the time period number n corresponding to each valid pulse, and if the n is larger than 100000/f, subtracting 100000/f from n until n is smaller than 100000/f; wherein 100000 is derived from the reciprocal of 10 microseconds;
and 8: counting the number of all effective pulses in the total time length of the sampling in the step 4, and recording the number as N;
and step 9: according to the time period number n corresponding to the effective pulse in the step 7, counting the number of the effective pulses which are in accordance with a characteristic interval 10000/(18 f) < n <20000/(9 f), and recording the number as M to represent the number of points of the effective pulses in the discharge characteristic phase;
step 10: if M/N is greater than 0.5, considering that partial discharge exists in the switch cabinet in the step 1, closely paying attention to the insulation condition or performing maintenance, if 0.3< M/N <0.5, considering that partial discharge possibly exists in the switch cabinet in the step 1, and intensively observing, if M/N <0.3, considering that partial discharge does not exist in the switch cabinet in the step 1, and ensuring that the insulation condition is safe;
the module for measuring frequency and phase is formed by connecting a shaping circuit, a counter circuit and an output part in sequence, wherein the shaping circuit is used for shaping a sine periodic signal into a square signal; the counter circuit obtains the zero crossing phase and the period of the signal through zero crossing timing and clock counting, and the zero crossing phase and the period are output by the output part.
The transient ground voltage sensor is a transient ground voltage (TEV) sensor based on a coupling capacitance principle;
the partial discharge measurement system is a partial discharge tester or oscilloscope with the sampling frequency not lower than 20MHz, and the input impedance is not lower than 1 megaohm.
The invention has the advantages that the part which can endanger the insulation safety in the switch cabinet can be found in time, the partial discharge of the switch cabinet is monitored, the insulation fault is diagnosed accurately in early stage, and the switch cabinet is overhauled in time; the method has the advantages of reducing equipment accident loss and unplanned shutdown, enhancing operation capacity, and improving equipment operation and maintenance management level, and has very important significance.
Drawings
Fig. 1 is a schematic diagram of a partial discharge test circuit of a high-voltage switch cabinet.
Detailed Description
The invention aims to provide a partial discharge identification method for a high-voltage switch cabinet;
fig. 1 is a schematic diagram of a partial discharge test circuit of a high-voltage switch cabinet, in which a module 1 for measuring frequency and phase of the voltage of the switch cabinet is connected with a square wave generating device 2; the phase and frequency output by the module 1 for measuring frequency and phase are used as trigger signals of the square wave generating device 2 to generate standard square waves with uniform frequency and phase; the transient ground voltage sensor 3 is fixed on the high-voltage switch cabinet, and the partial discharge measurement system 4 is connected with the transient ground voltage sensor 3 and is used for collecting partial discharge signals of the high-voltage switch cabinet in operation; the method adopts a form of superimposed square waves, and is mainly characterized in that a square wave signal and a high-voltage sinusoidal signal applied by the tested high-voltage switch cabinet have the same frequency and the same phase, so that when partial discharge is generated at the insulation weak position of the tested high-voltage switch cabinet, the partial discharge signal can be separated from other interference signals by phase information more effectively; therefore, partial discharge signals of the switch cabinet are collected through the transient ground voltage sensor, whether the signals are partial discharge signals or not is judged according to the characteristics of the tested signals, and the position of partial discharge is analyzed; the method specifically comprises the following steps:
step 1: under the condition of live operation of the switch cabinet, detecting signals by using a transient earth voltage sensor and a measuring system, and setting the maximum amplitude of the absolute value of the measured signals in the step 1 as Y;
step 2: acquiring the change condition of sinusoidal voltage of high-voltage electricity of the switch cabinet along with time, calculating the frequency f and the phase A of the sinusoidal voltage, shaping to generate square wave signals with the same frequency f (Hz) and the same phase A, wherein the high level of the square wave signals is 1-10V, and the low level of the square wave signals is 0;
and step 3: injecting the square wave signal to the ground on the shell of the switch cabinet, wherein the ground is the same as the ground of the output signal of the transient voltage sensor in the step 1;
and 4, step 4: detecting signals by using the same sensor and measuring system as in the step 1;
and 5: sampling the test signal obtained in the step (4), wherein the signal value of each time point after sampling is called as sampling data, and the total time length of sampling is not less than 10 seconds and is an integral multiple of the reciprocal of the frequency f of the sinusoidal voltage in the step (2);
step 6: dividing the total time of the sampling in the step 4 into n time segments with the length of 10 microseconds from the time point of starting timing of measurement, wherein the number of the time segments is n-1, 2 and 3 … … in sequence;
and 7: if the sampled data in each time period has an absolute value higher than Y/2, all the data in the time period is called a valid pulse, the time period number n corresponding to each valid pulse is recorded, if the n is larger than 100000/f, 100000/f is subtracted from n until n is smaller than 100000/f;
and 8: counting the number of all effective pulses in the total time length of the sampling in the step 4, and recording the number as N;
and step 9: according to the time section number n corresponding to the effective pulse in the step 7, counting the number of the effective pulses which are in accordance with a characteristic interval 10000/(18 x f) < n <20000/(9 x f), and recording the number as M;
step 10: if M/N is greater than 0.5, considering that partial discharge exists in the switch cabinet in the step 1, closely paying attention to the insulation condition or performing maintenance, if 0.3< M/N <0.5, considering that partial discharge possibly exists in the switch cabinet in the step 1, and intensively observing, if M/N <0.3, considering that partial discharge does not exist in the switch cabinet in the step 1, and ensuring that the insulation condition is safe;
the transient ground voltage sensor is a transient ground voltage (TEV) sensor based on a coupling capacitance principle;
the measuring system is a partial discharge tester or oscilloscope with the sampling frequency not lower than 20MHz, and the input impedance is not lower than 1 megaohm.
Claims (4)
1. A partial discharge identification method for a high-voltage switch cabinet; the method is characterized in that a module (1) for measuring the frequency and the phase of the voltage of the switch cabinet is connected with a square wave generating device (2); the transient ground voltage sensor (3) is fixed on the high-voltage switch cabinet, and the partial discharge measurement system (4) is connected with the transient ground voltage sensor (3); collecting partial discharge signals of the operating high-voltage switch cabinet; specifically, a superimposed square wave form is adopted, a partial discharge signal of the switch cabinet is acquired through a transient ground voltage sensor, whether the partial discharge signal is a discharge signal or not is judged according to the characteristics of the tested signal, and the position of partial discharge is analyzed; the method specifically comprises the following steps:
step 1: under the condition of live operation of the switch cabinet, detecting signals by using a transient earth voltage sensor and a local discharge measuring system, and setting the maximum amplitude of the absolute value of the detected signals as Y;
step 2: acquiring the change condition of sinusoidal voltage of high-voltage electricity of the switch cabinet along with time, calculating the frequency f and the phase A of the sinusoidal voltage, shaping to generate square wave signals with the same frequency f (Hz) and the same phase A, wherein the high level of the square wave signals is 1-10V, and the low level of the square wave signals is 0;
and step 3: injecting the square wave signal to the ground on the shell of the switch cabinet, wherein the ground is the same as the ground of the output signal of the transient voltage sensor in the step 1;
and 4, step 4: detecting signals by using the same sensor and measuring system as in the step 1;
and 5: sampling the test signal obtained in the step (4), wherein the signal value of each time point after sampling is called as sampling data, and the total time length of sampling is not less than 10 seconds and is an integral multiple of the reciprocal of the f in the step (2);
step 6: dividing the total time of the sampling in the step 5 into n time segments with the length of 10 microseconds from the time point of starting timing of measurement, wherein the number of the time segments is n-1, 2 and 3 … … in sequence;
and 7: sampling the amplitude of the absolute value of the measured signal in each time period, if the amplitude of one absolute value is higher than Y/2, then all data in the time period is called a valid pulse, recording the time period number n corresponding to each valid pulse, and if the n is larger than 100000/f, subtracting 100000/f from n until n is smaller than 100000/f; wherein 100000 is derived from the reciprocal of 10 microseconds;
and 8: counting the number of all effective pulses in the total sampling time length in the step 5, and recording the number as N;
and step 9: according to the time period number n corresponding to the effective pulse in the step 7, counting the number of the effective pulses which are in accordance with a characteristic interval 10000/(18 f) < n <20000/(9 f), and recording the number as M to represent the number of points of the effective pulses in the discharge characteristic phase;
step 10: if M/N >0.5, it is considered that partial discharge exists in the switch cabinet in the step 1, insulation condition should be closely paid attention or maintained, if 0.3< M/N <0.5, it is considered that partial discharge may exist in the switch cabinet in the step 1, observation should be strengthened, and if M/N <0.3, it is considered that partial discharge does not exist in the switch cabinet in the step 1, insulation condition is safe.
2. The partial discharge identification method for a high-voltage switchgear according to claim 1; the frequency and phase measuring module is characterized by being formed by sequentially connecting a shaping circuit, a counter circuit and an output part, wherein the shaping circuit is used for shaping a sine periodic signal into a square signal; the counter circuit obtains the zero crossing phase and the period of the signal through zero crossing timing and clock counting, and the zero crossing phase and the period are output by the output part.
3. The partial discharge identification method for a high-voltage switchgear according to claim 1; characterized in that the transient ground voltage sensor is a transient ground voltage (TEV) sensor based on the coupling capacitance principle.
4. The partial discharge identification method for a high-voltage switchgear according to claim 1; the partial discharge measurement system is characterized by being a partial discharge tester or oscilloscope with the sampling frequency not lower than 20MHz, and the input impedance is not lower than 1 megaohm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010739929.1A CN112034309B (en) | 2020-07-28 | 2020-07-28 | Partial discharge identification method for high-voltage switch cabinet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010739929.1A CN112034309B (en) | 2020-07-28 | 2020-07-28 | Partial discharge identification method for high-voltage switch cabinet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112034309A CN112034309A (en) | 2020-12-04 |
| CN112034309B true CN112034309B (en) | 2021-11-23 |
Family
ID=73583405
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010739929.1A Active CN112034309B (en) | 2020-07-28 | 2020-07-28 | Partial discharge identification method for high-voltage switch cabinet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112034309B (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1782724A (en) * | 2005-10-10 | 2006-06-07 | 西安交通大学 | Synthetic insulator on-line detector based on pulse current method |
| KR100801468B1 (en) * | 2006-08-11 | 2008-02-14 | 한빛이디에스(주) | Partial discharge counter for electric power gis system diagnostic |
| CN101458291A (en) * | 2009-01-09 | 2009-06-17 | 南京因泰莱配电自动化设备有限公司 | Transformer partial discharge online detection data acquisition unit and detecting method |
| JP2013190342A (en) * | 2012-03-14 | 2013-09-26 | Toshiba Mitsubishi-Electric Industrial System Corp | Partial discharge measurement system and partial discharge measurement method by repeated impulse voltage |
| CN203965489U (en) * | 2014-06-17 | 2014-11-26 | 三泰电力技术（南京）股份有限公司 | A kind of shelf depreciation high voltage pulse generation device |
| CN204010279U (en) * | 2014-06-18 | 2014-12-10 | 广东电网公司东莞供电局 | For detection of the wireless synchronization device of the phase information of high-tension apparatus shelf depreciation |
| CN102597790B (en) * | 2009-10-30 | 2015-06-17 | 特英普Hq有限公司 | Device and method for detecting and processing signals relating to partial electrical discharges |
| CN104950231A (en) * | 2015-05-29 | 2015-09-30 | 广西电网有限责任公司电力科学研究院 | Cable insulation partial discharge defect and insulation state voltage resistance testing method and device |
| CN107167716A (en) * | 2017-07-11 | 2017-09-15 | 国网福建省电力有限公司泉州供电公司 | A kind of shelf depreciation default kind identification method and device |
| CN108919066A (en) * | 2018-05-22 | 2018-11-30 | 广西电网有限责任公司电力科学研究院 | A kind of partial discharge of switchgear detection system and detection method |
-
2020
- 2020-07-28 CN CN202010739929.1A patent/CN112034309B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1782724A (en) * | 2005-10-10 | 2006-06-07 | 西安交通大学 | Synthetic insulator on-line detector based on pulse current method |
| KR100801468B1 (en) * | 2006-08-11 | 2008-02-14 | 한빛이디에스(주) | Partial discharge counter for electric power gis system diagnostic |
| CN101458291A (en) * | 2009-01-09 | 2009-06-17 | 南京因泰莱配电自动化设备有限公司 | Transformer partial discharge online detection data acquisition unit and detecting method |
| CN102597790B (en) * | 2009-10-30 | 2015-06-17 | 特英普Hq有限公司 | Device and method for detecting and processing signals relating to partial electrical discharges |
| JP2013190342A (en) * | 2012-03-14 | 2013-09-26 | Toshiba Mitsubishi-Electric Industrial System Corp | Partial discharge measurement system and partial discharge measurement method by repeated impulse voltage |
| CN203965489U (en) * | 2014-06-17 | 2014-11-26 | 三泰电力技术（南京）股份有限公司 | A kind of shelf depreciation high voltage pulse generation device |
| CN204010279U (en) * | 2014-06-18 | 2014-12-10 | 广东电网公司东莞供电局 | For detection of the wireless synchronization device of the phase information of high-tension apparatus shelf depreciation |
| CN104950231A (en) * | 2015-05-29 | 2015-09-30 | 广西电网有限责任公司电力科学研究院 | Cable insulation partial discharge defect and insulation state voltage resistance testing method and device |
| CN107167716A (en) * | 2017-07-11 | 2017-09-15 | 国网福建省电力有限公司泉州供电公司 | A kind of shelf depreciation default kind identification method and device |
| CN108919066A (en) * | 2018-05-22 | 2018-11-30 | 广西电网有限责任公司电力科学研究院 | A kind of partial discharge of switchgear detection system and detection method |
Non-Patent Citations (2)
| Title |
|---|
| PD characteristics at Square Shaped Voltages Applying Two Different Detecting Techniques;A. Madonia 等;《2016 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)》;20161231;第247-250页 * |
| 变频电机绝缘的局部放电检测技术;王鹏 等;《高电压技术》;20140228;第40卷(第2期);第519-525页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112034309A (en) | 2020-12-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Stone | Partial discharge diagnostics and electrical equipment insulation condition assessment | |
| US9390067B2 (en) | Method for the continuous monitoring and diagnosis of sources of partial discharges (PDs) in high voltage cables during connection to, and operation in the power grid, and physical system for carrying out same | |
| CN103675623B (en) | GIS partial discharge detection method and system under a kind of surge voltage | |
| EP1153308A1 (en) | Partial discharge site location system for determining the position of faults in a high voltage cable | |
| CN110244199A (en) | Partial discharge pulse's statistical method based on time domain reconstruction | |
| WO2015087284A1 (en) | Analyzing partial discharge in an electric power distribution system | |
| CN102331544B (en) | Method for distinguishing high resistance grounding failure and metallic grounding failure of power transmission line | |
| CN110794329B (en) | Method for testing defect recognition capability of partial discharge live detector of combined electrical apparatus and switch cabinet | |
| CN113325276A (en) | GIS epoxy insulation surface defect partial discharge detection method and device | |
| JP2019132823A (en) | Feature amount acquisition device, discharge monitoring system, discharge monitoring device, and method for monitoring discharge | |
| CN202041614U (en) | Insulation defect local discharging signal identifying device of ultrahigh voltage cable line | |
| CN111426342A (en) | State diagnosis device and method for high-voltage ring main unit | |
| CN106443388A (en) | Electric tree channel partial discharge analyzing system based on LabVIEW | |
| KR102385437B1 (en) | Simulated signal generating Apparatus for partial discharge simulation | |
| CN110031733A (en) | Detection method for local discharge and system | |
| CN104583786A (en) | Electromagnetic wave identification method and identification device | |
| CN112034309B (en) | Partial discharge identification method for high-voltage switch cabinet | |
| CN105807153B (en) | Power source surge protector failure cause diagnostic method and device | |
| CN105629144B (en) | High-tension switch gear partial discharge diagnostic method and system based on fingerprint base | |
| CN114280427A (en) | Local discharge distributed monitoring and early warning method based on ground electric waves of switch cabinet | |
| CN216900776U (en) | Digital partial discharge tester | |
| JP2020187955A (en) | Method and device for diagnosing switchgear | |
| Hudon et al. | The importance of phase resolved partial discharge pattern recognition for on-line generator monitoring | |
| CN112285508B (en) | Positioning method for partial discharge of high-voltage power cable | |
| KR100590801B1 (en) | Apparatus for measuring electromagnetic waves radiated from electric power equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |