CN106199349B - Partial discharge of transformer region decision method based on calibration square-wave signal transmitting ratio - Google Patents
Partial discharge of transformer region decision method based on calibration square-wave signal transmitting ratio Download PDFInfo
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- CN106199349B CN106199349B CN201610474117.2A CN201610474117A CN106199349B CN 106199349 B CN106199349 B CN 106199349B CN 201610474117 A CN201610474117 A CN 201610474117A CN 106199349 B CN106199349 B CN 106199349B
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000012360 testing method Methods 0.000 claims abstract description 31
- 239000003990 capacitor Substances 0.000 claims abstract description 6
- 230000008878 coupling Effects 0.000 claims abstract description 6
- 238000010168 coupling process Methods 0.000 claims abstract description 6
- 238000005859 coupling reaction Methods 0.000 claims abstract description 6
- 238000012886 linear function Methods 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
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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
Abstract
Invention is related to a kind of partial discharge of transformer region decision method based on calibration square-wave signal transmitting ratio, and technical characteristics are: extracting partial discharge test signal from transformer high-voltage, middle pressure and low pressure by bottom shielding of bushing or coupling capacitor；Square wave calibration is carried out to each side of transformer, calculates and records the transmitting ratio between each side signal；When partial discharge quantity is more than calibration limit value during partial discharge test reaches test voltage or test, the local discharge signal measured value of record high pressure, middle pressure, low pressure；Obtain the practical shelf depreciation magnitude of each side of transformer；It is excluded the interference signal according to each side shelf depreciation magnitude.The present invention realizes quick, effective, convenient, the reliable arbitration functions of interference signal and local discharge characteristics and position during transformer field partial discharge test, solves the decision problem of interference signal and local discharge characteristics and position during transformer field partial discharge test.
Description
Technical field
Invention belongs to existing partial discharge of transformer technical field, especially a kind of change based on calibration square-wave signal transmitting ratio
Depressor shelf depreciation region decision method.
Background technique
Transformer field partial discharge test is the insulation status that can reflect transformer in advance, is found in transformer in time
The insulation defect in portion is both needed to examine transformer insulating system by the test after equipment factory, handover, overhaul.But
It is that when field test, each side shelf depreciation magnitude of the transformer shown by Partial discharge detector often can not effectively divide
Precipitation is interference, high pressure, middle pressure, low-pressure side electric discharge or the real local discharge signal of low pressure test (LPT) system, that is to say, that
It can not determine the region for the local discharge signal that measurement obtains.This directly affects the judgement of testing crew, or even part is caused to put
The erroneous judgement of electricity.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of changes based on calibration square-wave signal transmitting ratio
Depressor shelf depreciation region decision method, solves interference signal and shelf depreciation during transformer field partial discharge test
The decision problem of property and position.
The present invention solves its technical problem and adopts the following technical solutions to achieve:
A kind of partial discharge of transformer region decision method based on calibration square-wave signal transmitting ratio, comprising the following steps:
Step 1, when carrying out the wiring of transformer field shelf depreciation, respectively from transformer high-voltage, it is middle pressure and low pressure pass through
Bottom shielding of bushing or coupling capacitor extract partial discharge test signal；
Step 2 carries out square wave calibration to each side of transformer, calculates and records the transmitting ratio between each side signal；
Step 3: when partial discharge quantity is more than calibration limit value during partial discharge test reaches test voltage or test,
Record the local discharge signal measured value P of high pressure, middle pressure, low pressure1、P2、P3；
Step 4 passes through solution ternary linear function, the practical shelf depreciation magnitude of available each side of transformer；
Step 5, according to each side shelf depreciation magnitude, local region of discharge is judged, is excluded the interference signal.
The implementation method of the step 2 are as follows: the square wave with low pressure is pressed after square-wave signal is injected in high-pressure side, while in reading
Signal level records the ratio between high pressure and middle pressure square-wave signal P1-2With the ratio between high pressure and low pressure square-wave signal P1-3；It is middle pressure and it is low
Pressure is injected separately into square-wave signal, the ratio between pressure and high-voltage square wave signal P in acquisition2-1, middle pressure and the ratio between low pressure square-wave signal P2-3, it is low
The ratio between pressure and high-voltage square wave signal P3-1, the ratio between low pressure and middle pressure square-wave signal P3-2。
The calculation method of the step 4 are as follows:
Wherein, PX、PY、PZThe respectively practical shelf depreciation magnitude of each side of transformer.
The advantages of invention and good effect are:
The present invention realizes interference signal and local discharge characteristics and position during transformer field partial discharge test
Quick, effective, convenient, reliable arbitration functions, solve during transformer field partial discharge test interference signal and
The decision problem of shelf depreciation property and position can effectively assist field test personnel to improve the accurate of partial discharge test analysis
Property.
Detailed description of the invention
Fig. 1 is the process flow diagram of invention.
Specific embodiment
Inventive embodiments are further described below in conjunction with attached drawing:
A kind of partial discharge of transformer region decision method based on calibration square-wave signal transmitting ratio, as shown in Figure 1, including
Following steps:
Step 1, when carrying out the wiring of transformer field shelf depreciation, respectively from transformer high-voltage, it is middle pressure and low pressure pass through
Bottom shielding of bushing or coupling capacitor extract partial discharge test signal.
Process require that each side of transformer has the condition for extracting signal by end shield and coupling capacitor.This step needs
Partial discharge test signal is extracted from transformer high-voltage, middle pressure and low pressure by bottom shielding of bushing or coupling capacitor.
Step 2 is carrying out square wave timing to each side of transformer, after square-wave signal is injected in high-pressure side, while in reading
The square-wave signal of pressure and low pressure is horizontal, records the ratio between high pressure and middle pressure square-wave signal P1-2With the ratio between high pressure and low pressure square-wave signal
P1-3, likewise, it is injected separately into square-wave signal in middle pressure and low pressure, the ratio between pressure and high-voltage square wave signal P in acquisition2-1, it is middle pressure with
The ratio between low pressure square-wave signal P2-3, the ratio between low pressure and high-voltage square wave signal P3-1, the ratio between low pressure and middle pressure square-wave signal P3-2。
Step 3: when partial discharge quantity is more than calibration limit value during partial discharge test reaches test voltage or test,
Record the local discharge signal measured value P of high pressure, middle pressure, low pressure1、P2、P3。
Step 4 passes through solution ternary linear function, the practical shelf depreciation magnitude P of available each side of transformerX、PY、
PZ, calculation formula is as follows:
Step 5, according to each side shelf depreciation magnitude, local region of discharge is judged, is excluded the interference signal.
The fundamental region that shelf depreciation occurs can be tentatively judged according to the practical shelf depreciation magnitude of each side of transformer,
It is high by calculating the transformer obtained such as when local discharge signal is derived only from the interference of step down side pilot system
The practical partial discharge quantity of pressure and middle pressure will be close to background value, and low-pressure side partial discharge quantity will be close to signal measurements.
It should be noted that will flood actual shelf depreciation value if partial discharge test background is excessive and then influence
The validity of this method, therefore, when field test, should control level of background signal.In addition, this method calculates signal used
Transmitting than relationship be by winding line end inject square wave calibration signal obtain, therefore, once shelf depreciation do not occur around
In group, each side actual signal of transformer transmits the deviation more certain than having, but is not sufficient to influence to sentence local region of discharge
It is disconnected.
It is emphasized that invention the embodiment described be it is illustrative, without being restrictive, because the invention include simultaneously
It is not limited to embodiment described in specific embodiment, it is all to be obtained by those skilled in the art according to the technical solution of invention
Other embodiments also belong to the range of invention protection.
Claims (1)
1. it is a kind of based on calibration square-wave signal transmitting ratio partial discharge of transformer region decision method, it is characterised in that including with
Lower step:
Step 1, when carrying out the wiring of transformer field shelf depreciation, respectively from transformer high-voltage, it is middle pressure and low pressure pass through casing
End shield or coupling capacitor extract partial discharge test signal；
Step 2 carries out square wave calibration to each side of transformer, calculates and records the transmitting ratio between each side signal, specific method
Are as follows:
The square-wave signal of pressure and low pressure is horizontal after square-wave signal is injected in high-pressure side, while in reading, record high pressure and middle pressure side
The ratio between wave signal P1-2With the ratio between high pressure and low pressure square-wave signal P1-3；Square-wave signal is injected separately into middle pressure and low pressure, in acquisition
The ratio between pressure and high-voltage square wave signal P2-1, middle pressure and the ratio between low pressure square-wave signal P2-3, the ratio between low pressure and high-voltage square wave signal P3-1,
The ratio between low pressure and middle pressure square-wave signal P3-2；
Step 3: when partial discharge quantity is more than calibration limit value during partial discharge test reaches test voltage or test, record
Local discharge signal measured value P1, P2, P3 of high pressure, middle pressure, low pressure；
Step 4 passes through solution ternary linear function, the practical shelf depreciation magnitude of available each side of transformer, calculating side
Method are as follows:
Wherein, PX, PY, PZ are respectively the practical shelf depreciation magnitude of each side of transformer；
Step 5, according to each side shelf depreciation magnitude, local region of discharge is judged, is excluded the interference signal.
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| CN201610474117.2A CN106199349B (en) | 2016-06-21 | 2016-06-21 | Partial discharge of transformer region decision method based on calibration square-wave signal transmitting ratio |
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| CN201610474117.2A CN106199349B (en) | 2016-06-21 | 2016-06-21 | Partial discharge of transformer region decision method based on calibration square-wave signal transmitting ratio |
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| CN106199349A CN106199349A (en) | 2016-12-07 |
| CN106199349B true CN106199349B (en) | 2019-02-22 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106707125B (en) * | 2017-01-04 | 2019-05-28 | 保定天威集团特变电气有限公司 | Oil-gas casing product shelf depreciation experimental method |
| CN111239560B (en) * | 2020-02-06 | 2022-06-07 | 云南电网有限责任公司电力科学研究院 | Multi-sensor-based partial discharge positioning method |
| CN111999609B (en) * | 2020-08-10 | 2024-01-26 | 国网天津市电力公司电力科学研究院 | Interference signal investigation method for local discharge test of field transformer |
| CN112557845B (en) * | 2020-11-27 | 2022-05-13 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Capacitive bushing partial discharge positioning method |
| CN113253022B (en) * | 2021-04-30 | 2022-08-16 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Testing device and method for internal transient voltage transmission rule of extra-high voltage converter transformer |
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| CN202486270U (en) * | 2012-02-13 | 2012-10-10 | 天威云南变压器股份有限公司 | Field partial discharge test circuit and system for high-voltage side lead-in cable of transformer |
| CN104714158B (en) * | 2015-03-11 | 2017-12-15 | 国家电网公司 | AC extra high voltage main transformer modulation combines partial discharge test system and method |
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Inventor after: Wang Nan Inventor after: Wei Jufang Inventor after: Wang Wei Inventor after: Zhang Chi Inventor after: Zhang Xin Inventor after: Zhu Mingzheng Inventor after: Meng Zhengzheng Inventor before: Wang Nan Inventor before: Wang Wei Inventor before: Zhang Xin Inventor before: Wei Jufang Inventor before: Zhu Mingzheng Inventor before: Meng Zhengzheng |