CN114236324A - Method and device for acquiring partial discharge power frequency synchronous voltage signal - Google Patents
Method and device for acquiring partial discharge power frequency synchronous voltage signal Download PDFInfo
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- CN114236324A CN114236324A CN202111398804.8A CN202111398804A CN114236324A CN 114236324 A CN114236324 A CN 114236324A CN 202111398804 A CN202111398804 A CN 202111398804A CN 114236324 A CN114236324 A CN 114236324A
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- power frequency
- voltage signal
- partial discharge
- voltage
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
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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
- G01R31/1254—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 of gas-insulated power appliances or vacuum gaps
Abstract
The invention provides a method and a device for acquiring a partial discharge power frequency synchronous voltage signal, which directly acquire a mains supply voltage signal in a partial discharge monitoring device according to the characteristic that the phase difference between the operating voltage of high-voltage alternating-current equipment and the mains supply voltage is fixed, and carry out phase correction by combining the phase difference between the operating voltage signal of the high-voltage alternating-current equipment and the mains supply voltage signal to acquire the power frequency synchronous voltage signal, thereby avoiding potential safety risk caused by acquiring the power frequency synchronous voltage signal at the high-voltage alternating-current equipment by additionally arranging a sensor, improving the safety of a monitoring system, reducing the construction cost of the system, providing a safe, economic and effective means for acquiring the partial discharge power frequency synchronous signal, and effectively promoting the popularization and application of partial discharge measurement in the high-voltage alternating-current equipment. The invention is suitable for partial discharge monitoring of high-voltage alternating-current equipment such as a generator, a transformer, a GIS and the like.
Description
Technical Field
The invention belongs to the field of power equipment state monitoring, and particularly relates to a method and a device for acquiring a partial discharge power frequency synchronous voltage signal.
Background
High-voltage power equipment such as a generator, a transformer, a GIS and the like is key equipment of a power system, and safe and stable operation of the equipment is very important for the power system.
Insulation faults are the main fault types of high-voltage electrical equipment, and partial discharge is the sign and cause of the insulation fault, so partial discharge monitoring is one of the currently main insulation state evaluation and insulation fault diagnosis means.
Due to the fact that different Partial Discharge types generated by different insulation defects show different Partial Discharge Phase distribution modes (PRPD), the PRPD is widely applied to Partial Discharge monitoring, and therefore the power frequency Phase of the Discharge pulse becomes an indispensable key parameter.
At present, the additional sensor is generally adopted to carry out voltage reduction processing on the operating voltage of the high-voltage alternating-current equipment, and a power frequency synchronous voltage signal is obtained in a synchronous acquisition mode, so that a partial discharge power frequency phase is obtained through calculation. The method has the disadvantages that a power frequency sensor needs to be additionally arranged, the operation safety of the high-voltage alternating-current equipment is influenced while the construction cost is increased, and the popularization and the application of partial discharge monitoring are not facilitated.
Disclosure of Invention
In order to solve the technical problems, and simultaneously consider the characteristic that the phase difference between the operating voltage of the high-voltage alternating-current equipment and the station commercial power voltage is fixed, the invention provides a method for acquiring a partial discharge power frequency synchronous voltage signal, so as to realize the safe and economic acquisition of the partial discharge power frequency synchronous voltage signal.
Therefore, the above purpose of the invention is realized by the following technical scheme:
a method for acquiring a partial discharge power frequency synchronous voltage signal is characterized by comprising the following steps: the method for acquiring the partial discharge power frequency synchronous voltage signal comprises the following steps:
s1, obtaining the phase difference between the running voltage signal of the high-voltage alternating-current equipment and the mains voltage signal;
s2, acquiring a mains supply voltage signal in the partial discharge monitoring device;
and S3, performing phase correction on the voltage signal of the mains supply by using the power frequency phase-shifting filter to obtain a power frequency synchronous voltage signal.
While adopting the technical scheme, the invention can also adopt or combine the following technical scheme:
as a preferred technical scheme of the invention: in step S1, the phase difference is calculated by the wiring form in the main wiring diagram and the transformer winding connection group.
As a preferred technical scheme of the invention: in step S1, the phase difference is obtained by experimental measurement using a capacitive voltage divider and an oscilloscope.
As a preferred technical scheme of the invention: in step S2, the commercial power supply voltage signal is measured by a power frequency voltage transformer.
It is still another object of the present invention to provide a device for obtaining a local discharge power frequency synchronization voltage signal, which overcomes the drawbacks of the prior art.
Therefore, the above purpose of the invention is realized by the following technical scheme:
the utility model provides a partial discharge power frequency synchronization voltage signal acquisition device which characterized in that: the partial discharge power frequency synchronous voltage signal acquisition device comprises a power frequency voltage transformer and a power frequency signal conditioner;
the power frequency signal conditioner is provided with an input end and an output end,
the primary side of the voltage transformer is connected with a commercial power supply of the partial discharge monitoring device, the secondary side of the voltage transformer is connected with the input end of the power frequency signal conditioner,
and the output end of the power frequency signal conditioner is connected with the partial discharge monitoring device.
The power frequency signal conditioner is a power frequency phase-shifting filter, and the phase shift of the power frequency phase-shifting filter is the phase difference between the operating voltage signal of the high-voltage alternating-current equipment and the commercial power voltage signal.
The invention provides a method and a device for acquiring a partial discharge power frequency synchronous voltage signal, which have the following beneficial effects:
according to the characteristic that the phase difference between the operating voltage of the high-voltage alternating-current equipment and the mains voltage is fixed, the mains supply voltage signal in the partial discharge monitoring device is directly obtained, and the phase difference between the operating voltage signal of the high-voltage alternating-current equipment and the mains voltage signal is combined to carry out phase correction to obtain the power frequency synchronous voltage signal, so that the potential safety risk caused by the fact that the power frequency synchronous voltage signal is obtained by additionally arranging a sensor at the high-voltage alternating-current equipment at present is avoided, the safety of a monitoring system is improved, meanwhile, the system construction cost is reduced, a safe, economical and effective partial discharge power frequency synchronous signal obtaining means is provided, and the popularization and application of partial discharge measurement in the high-voltage alternating-current equipment can be effectively promoted. The invention is suitable for monitoring partial discharge of high-voltage alternating-current equipment such as a generator, a transformer, a GIS and the like, avoids the problem of directly obtaining a power frequency synchronous voltage signal from primary equipment, and reduces the structural complexity and the cost of a device for obtaining the partial discharge power frequency synchronous voltage signal.
Drawings
Fig. 1 is a schematic flow chart of a method for acquiring a partial discharge power frequency synchronization voltage signal according to the present invention.
Fig. 2 is a schematic diagram of waveforms of the operating voltage signal of the high-voltage device, the mains voltage signal and the voltage signal processed by the power frequency signal conditioner.
Fig. 3 is a schematic structural diagram of the partial discharge power frequency synchronous voltage signal acquisition device provided by the present invention.
Detailed Description
The invention is described in further detail with reference to the figures and specific embodiments.
As shown in fig. 1, a method for acquiring a local discharge power frequency synchronous voltage signal includes:
s1, obtaining the phase difference between the running voltage signal of the high-voltage alternating-current equipment and the mains voltage signal;
s2, acquiring a mains supply voltage signal in the partial discharge monitoring device;
and S3, performing phase correction on the voltage signal of the mains supply by using the power frequency phase-shifting filter to obtain a power frequency synchronous voltage signal.
In step S1, the phase difference is calculated by the wiring pattern in the main wiring diagram and the transformer winding connection group, or is measured by a test using a capacitive voltage divider and an oscilloscope.
In step S2, the commercial power supply voltage signal is measured by a power frequency voltage transformer.
As shown in fig. 2, a curve labeled 1 in the figure is an operating voltage signal of a high-voltage device, a curve labeled 2 is a mains voltage signal, a curve labeled 3 is a voltage signal output by a power frequency voltage transformer, and a curve labeled 4 is a voltage signal output by a power frequency phase shift filter. Wherein, the phase difference between 1 and 2 is 93.6 ° of the phase difference between the operating voltage signal of the high-voltage ac equipment obtained in step S1 and the mains voltage signal, 2 and 3 have the same phase, and the phase difference between 3 and 4 is-93.6 ° of the phase shift of the power frequency phase shift filter, so 1 and 4 have no phase shift.
As shown in fig. 3, a partial discharge power frequency synchronous voltage signal acquisition apparatus includes a power frequency voltage transformer and a power frequency signal conditioner;
the power frequency signal conditioner is provided with an input end and an output end, a voltage transformer is connected with a commercial power supply of the partial discharge monitoring device at the primary side, the voltage transformer is connected with the input end of the power frequency signal conditioner at the secondary side, and the output end of the power frequency signal conditioner is connected with the partial discharge monitoring device.
The power frequency signal conditioner is a power frequency phase shift filter, and the phase shift of the power frequency phase shift filter is the phase difference between the running voltage signal of the high-voltage alternating-current equipment and the commercial power voltage signal.
The above-described embodiments are intended to illustrate the present invention, but not to limit the present invention, and any modifications, equivalents, improvements, etc. made within the spirit of the present invention and the scope of the claims fall within the scope of the present invention.
Claims (6)
1. A method for acquiring a partial discharge power frequency synchronous voltage signal is characterized by comprising the following steps: the method for acquiring the partial discharge power frequency synchronous voltage signal comprises the following steps:
s1, obtaining the phase difference between the running voltage signal of the high-voltage alternating-current equipment and the mains voltage signal;
s2, acquiring a mains supply voltage signal in the partial discharge monitoring device;
and S3, performing phase correction on the voltage signal of the mains supply by using the power frequency phase-shifting filter to obtain a power frequency synchronous voltage signal.
2. The method for acquiring the partial discharge power frequency synchronous voltage signal according to claim 1, wherein: in step S1, the phase difference is calculated by the wiring form in the main wiring diagram and the transformer winding connection group.
3. The method for acquiring the partial discharge power frequency synchronous voltage signal according to claim 1, wherein: in step S1, the phase difference is obtained by experimental measurement using a capacitive voltage divider and an oscilloscope.
4. The method for acquiring the partial discharge power frequency synchronous voltage signal according to claim 1, wherein: in step S2, the commercial power supply voltage signal is measured by a power frequency voltage transformer.
5. The utility model provides a partial discharge power frequency synchronization voltage signal acquisition device which characterized in that: the partial discharge power frequency synchronous voltage signal acquisition device comprises a power frequency voltage transformer and a power frequency signal conditioner;
the power frequency signal conditioner is provided with an input end and an output end,
the primary side of the voltage transformer is connected with a commercial power supply of the partial discharge monitoring device, the secondary side of the voltage transformer is connected with the input end of the power frequency signal conditioner,
and the output end of the power frequency signal conditioner is connected with the partial discharge monitoring device.
6. The partial discharge power frequency synchronous voltage signal acquisition device according to claim 5, wherein: the power frequency signal conditioner is a power frequency phase-shifting filter, and the phase shift of the power frequency phase-shifting filter is the phase difference between the operating voltage signal of the high-voltage alternating-current equipment and the commercial power voltage signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111398804.8A CN114236324A (en) | 2021-11-24 | 2021-11-24 | Method and device for acquiring partial discharge power frequency synchronous voltage signal |
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| CN202111398804.8A CN114236324A (en) | 2021-11-24 | 2021-11-24 | Method and device for acquiring partial discharge power frequency synchronous voltage signal |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6474467A (en) * | 1987-09-17 | 1989-03-20 | Mitsubishi Cable Ind Ltd | Partial discharging measuring method |
| JP2014160045A (en) * | 2013-02-21 | 2014-09-04 | Toyota Motor Corp | Partial discharge inspection device and inspection method |
| KR20140132262A (en) * | 2013-05-07 | 2014-11-17 | 유호전기공업주식회사 | Apparatus and method for generating synchronous signal used to detect partial discharge |
| CN104316888A (en) * | 2014-05-28 | 2015-01-28 | 许继电气股份有限公司 | SV-sampling-signal-based partial discharge monitoring internal synchronization reference correction method |
| CN112986775A (en) * | 2021-05-12 | 2021-06-18 | 中国电建集团华东勘测设计研究院有限公司 | Active calibration method for partial discharge pulse phase |
-
2021
- 2021-11-24 CN CN202111398804.8A patent/CN114236324A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6474467A (en) * | 1987-09-17 | 1989-03-20 | Mitsubishi Cable Ind Ltd | Partial discharging measuring method |
| JP2014160045A (en) * | 2013-02-21 | 2014-09-04 | Toyota Motor Corp | Partial discharge inspection device and inspection method |
| KR20140132262A (en) * | 2013-05-07 | 2014-11-17 | 유호전기공업주식회사 | Apparatus and method for generating synchronous signal used to detect partial discharge |
| CN104316888A (en) * | 2014-05-28 | 2015-01-28 | 许继电气股份有限公司 | SV-sampling-signal-based partial discharge monitoring internal synchronization reference correction method |
| CN112986775A (en) * | 2021-05-12 | 2021-06-18 | 中国电建集团华东勘测设计研究院有限公司 | Active calibration method for partial discharge pulse phase |
Non-Patent Citations (1)
| Title |
|---|
| 路光辉;雍明超;王新刚;陈磊;周钟;梁武民;: "一种基于SV采样信号的局部放电监测内同步基准修正方法", 电测与仪表, no. 17 * |
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