CN110196402A - A kind of method of multi-point calibration shelf depreciation Apparent discharge magnitude - Google Patents
A kind of method of multi-point calibration shelf depreciation Apparent discharge magnitude Download PDFInfo
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- CN110196402A CN110196402A CN201910603890.8A CN201910603890A CN110196402A CN 110196402 A CN110196402 A CN 110196402A CN 201910603890 A CN201910603890 A CN 201910603890A CN 110196402 A CN110196402 A CN 110196402A
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- calibration
- point
- shelf depreciation
- partial discharge
- calibration point
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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
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention discloses a kind of methods of multi-point calibration shelf depreciation Apparent discharge magnitude.Step of the present invention: 1, shared n calibration point is set, is denoted as A respectively1~An；Under power failure, to above-mentioned calibration point A1~AnThe calibration pulse for squeezing into matching magnitude respectively is demarcated, and records the calibration coefficient of the detected value of Partial Discharge Detection point and corresponding calibration point when each calibration point is demarcated；2, under electriferous state, Partial Discharge Detection is carried out to each side high-tension apparatus and main transformer, and record to the numerical value of Partial Discharge Detection point；The shelf depreciation source calibration point according to similar in shelf depreciation source points selection signal propagation characteristics simultaneously, and according to the corresponding calibration coefficient of the calibration point, calculate relatively accurate partial discharge quantity；The present invention improves calibration verification pulse and the pulse of point of discharge partial discharge equivalent degree on a sensor, detection error is reduced, so that shelf depreciation source calibration point similar in signal propagation characteristics is found, so that the Apparent discharge magnitude detected and true partial discharge amount are closer.
Description
Technical field
The invention belongs to high pressure detection technique fields, and in particular to a kind of side of multi-point calibration shelf depreciation Apparent discharge magnitude
Method.
Background technique
Excellent insulation performance is high voltage installation or even the basic condition that network system operates normally, insulation degradation or exhausted
The failure of edge ability is to lead to high voltage electric equipment and network system failure one of the main reasons.With detection Characteristics of Partial Discharge reflection
The state of insulation of high voltage electric equipment is known as most sensitive, most effective means by industry.
Currently, the confirmation of specific partial discharge test Apparent discharge magnitude, needs to squeeze into matching magnitude under experimental enviroment
Calibration pulse is demarcated, to determine the electric discharge amplitude of subjects.
When existing partial discharge detector's device is to electric discharge amplitude calibration, assume that local discharge signal is transmitted to all detections
The characteristic of point (sensor), it is equivalent for being transmitted to sensor characteristics with the calibration pulse signal applied when calibration, so only
Mode provided with some calibration.
And in the partial discharge test that power station is whole or other large electric equipment assemblys carry out, different point of discharges
The difference in attenuation that signal travels to test point is very big, and the equivalence for a little demarcating mode is deteriorated, while the part detected is put
There are biggish errors for electricity.
Summary of the invention
The purpose of the present invention is to the deficiencies in the prior art, provide a kind of multi-point calibration shelf depreciation Apparent discharge magnitude
Method.
The present invention squeezes into respectively multiple calibration points the calibration pulse of matching magnitude by the way of multi-point calibration, and remembers
The detected value and corresponding calibration coefficient for recording test point choose part similar in signal propagation characteristics when practical partial discharge test
The calibration coefficient of electric discharge source calibration point, calculates relatively accurate partial discharge quantity.
The specific steps of the method for the present invention are as follows:
A kind of method of multi-point calibration shelf depreciation Apparent discharge magnitude is increased calibration point, is subtracted by the way of multi-point calibration
Few signal influence of fading generated by distance, to more accurately find the mark of shelf depreciation source similar in signal propagation characteristics
Fixed point, relatively accurate partial discharge quantity is calculated according to the calibration coefficient of the calibration point.Specifically comprise the following steps:
Step (1) assumes a total of n calibration point, is denoted as A respectively1~An；Under power failure, to above-mentioned calibration point A1
~AnThe calibration pulse for squeezing into matching magnitude respectively is demarcated, and records Partial Discharge Detection when each calibration point is demarcated
The calibration coefficient of the detected value of point and corresponding calibration point；
Assuming that working as calibration point A1When the calibration pulse that point squeezes into xPc is demarcated, the detection of Partial Discharge Detection point is recorded
Value y1MV, then calibration coefficient is x:y1；Same aforesaid way, to calibration point A2~AnIt is demarcated respectively.
And so on, when to calibration point AnThe calibration pulse that point squeezes into xPc is demarcated, and charges to the detected value of test point
ynMV, then the calibration coefficient of the calibration point is x:yn。
Step (2) carries out Partial Discharge Detection in the energized state, to each side high-tension apparatus and main transformer, and to shelf depreciation
The numerical value of test point is recorded；The shelf depreciation source according to similar in shelf depreciation source points selection signal propagation characteristics simultaneously
Calibration point, and according to the corresponding calibration coefficient of the calibration point, calculate relatively accurate partial discharge quantity；
When all shelf depreciation source points are located at calibration point A2And A3Between, it is propagated according to the signal of shelf depreciation source points
Characteristic judged closer to which calibration point, if the signal propagation characteristics of shelf depreciation source points are closest to calibration point A2, then
Calibration point A2It is the calibration point of shelf depreciation source points；Calibration point A2The inspection value measured in the energized state is Y2MV, calibration
Coefficient is x:y2, then the partial discharge quantity Q=(Y of the shelf depreciation source points is extrapolated2/y2)*x。
The shelf depreciation source points may be single or multiple；
The signal propagation characteristics choose shelf depreciation source calibration point according to amplitude and frequency.
The present invention has the beneficial effect that:
By way of above-mentioned multi-point calibration, calibration verification pulse can be improved and sensed with point of discharge partial discharge pulse
Equivalent degree on device reduces detection error, so that shelf depreciation source calibration point similar in signal propagation characteristics is found, and according to
The corresponding calibration coefficient of the calibration point, so that the Apparent discharge magnitude detected and true partial discharge quantity are closer.
Detailed description of the invention
Fig. 1 is detection example of the invention.
Specific embodiment
The present invention is described in detail below in conjunction with attached drawing, it is noted that described embodiment is only convenient for pair
Understanding of the invention, and do not play any restriction effect to it.
As shown in Figure 1, it includes high-pressure side, medium voltage side and low-pressure side that the transformer, which is three-phase power transformer, and high-pressure side
Connection is GIS, and medium voltage side connection is mutual inductor, and low-pressure side connection is breaker.Assuming that test item is GIS, then will
Multiple calibration points are located at the two sides of GIS, such as respectively choose a calibration point in test item two sides, are denoted as G1, G2 respectively.Meanwhile
A point is chosen as Partial Discharge Detection point in the high-pressure side of power transformer and is denoted as D, is carried out specific example of the invention and is said
It is bright.
The specific steps of the method for the present invention are as follows:
Step (1) demarcates above-mentioned calibration point G1, G2 calibration pulse for squeezing into 100pC respectively under power failure,
And the detected value and corresponding calibration coefficient of lower Partial Discharge Detection point D is charged to, as shown in table 1.
For example, the detected value of test point D is 10mV, then the calibration when the calibration pulse of calibration point G1 injection 100pC
The ratio relation of point is 10mV:100Pc, i.e., calibration coefficient is 1:10；When the calibration pulse of calibration point G2 injection 100pC, inspection
The detected value of measuring point D is 20mV, then the ratio relation of the calibration point is 20mV:100Pc, i.e., calibration coefficient is 1:5；
Step (2) carries out the detection of local discharge signal in the energized state, and local discharge signal is transmitted to test point D
Records of values get off.Shelf depreciation source calibration point similar in signal propagation characteristics is chosen, and according to corresponding calibration coefficient
Calculate relatively accurate partial discharge quantity.
For example, the detection numerical value of test point D is 160mV when partial discharge test, and local similar in signal propagation characteristics
Electric discharge source calibration point is G2.According to the calibration coefficient 1:5 of calibration point G2, can calculate partial discharge quantity is 800pC.
Table 1 is the data instance of each calibration point of the present invention and test point.
Pass through above-mentioned calibration and Partial Discharge Detection example, it may be verified that can be improved calibration by the way of multi-point calibration
Pulse and the equivalent degree of partial discharge pulse on a sensor are verified, to choose the close shelf depreciation of signal propagation characteristics
The calibration coefficient of source calibration point, so that calculating more accurate partial discharge quantity.
Claims (6)
1. a kind of method of multi-point calibration shelf depreciation Apparent discharge magnitude, it is characterised in that by the way of multi-point calibration, to more
A calibration point squeezes into the calibration pulse of matching magnitude respectively, and records the detected value and corresponding calibration coefficient of test point, reduces
The signal influence of fading generated by distance, to more accurately find the calibration of shelf depreciation source similar in signal propagation characteristics
Point calculates relatively accurate partial discharge quantity, specific steps according to the calibration coefficient of the calibration point are as follows:
Step (1) assumes a total of n calibration point, is denoted as A respectively1~An；Under power failure, to above-mentioned calibration point A1~AnPoint
The calibration pulse for not squeezing into matching magnitude is demarcated, and records the inspection of Partial Discharge Detection point when each calibration point is demarcated
The calibration coefficient of measured value and corresponding calibration point；
Step (2) carries out Partial Discharge Detection in the energized state, to each side high-tension apparatus and main transformer, and to Partial Discharge Detection
The numerical value of point is recorded；The shelf depreciation source calibration according to similar in shelf depreciation source points selection signal propagation characteristics simultaneously
Point, and according to the corresponding calibration coefficient of the calibration point, calculate relatively accurate partial discharge quantity.
2. a kind of method of multi-point calibration shelf depreciation Apparent discharge magnitude according to claim 1, it is characterised in that work as mark
Pinpoint A1When the calibration pulse that point squeezes into xPc is demarcated, the detected value y of Partial Discharge Detection point is recorded1MV, then calibration coefficient
For x:y1；Same aforesaid way, to calibration point A2~AnIt is demarcated respectively；When to calibration point AnPoint squeeze into the calibration pulse of xPc into
Rower is fixed, and charges to the detected value y of test pointnMV, then the calibration coefficient of the calibration point is x:yn。
3. a kind of method of multi-point calibration shelf depreciation Apparent discharge magnitude according to claim 2, it is characterised in that work as institute
There are shelf depreciation source points to be located at calibration point A2And A3Between, according to the signal propagation characteristics of shelf depreciation source points closer to which
A calibration point judged, if the signal propagation characteristics of shelf depreciation source points are closest to calibration point A2, then calibration point A2It is part
The calibration point for source points of discharging；Calibration point A2The inspection value measured in the energized state is Y2MV, calibration coefficient x:y2, then
Extrapolate the partial discharge quantity Q=(Y of the shelf depreciation source points2/y2)*x。
4. a kind of method of multi-point calibration shelf depreciation Apparent discharge magnitude according to claim 3, it is characterised in that described
Shelf depreciation source points be single.
5. a kind of method of multi-point calibration shelf depreciation Apparent discharge magnitude according to claim 3, it is characterised in that described
Shelf depreciation source points be multiple.
6. a kind of method of multi-point calibration shelf depreciation Apparent discharge magnitude according to claim 4 or 5, it is characterised in that institute
The signal propagation characteristics stated choose shelf depreciation source calibration point according to amplitude and frequency.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110346647A (en) * | 2019-07-05 | 2019-10-18 | 杭州西湖电子研究所 | A kind of three-dimensional figure spectrum expression of wide area Opposed Current ratio |
| CN111239558A (en) * | 2020-02-06 | 2020-06-05 | 云南电网有限责任公司电力科学研究院 | Online measurement method for equivalent discharge capacity of line fault arc |
| CN116223997A (en) * | 2023-05-06 | 2023-06-06 | 华北电力科学研究院有限责任公司 | Method and device for determining turn-to-turn discharge quantity of transformer winding |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110346647A (en) * | 2019-07-05 | 2019-10-18 | 杭州西湖电子研究所 | A kind of three-dimensional figure spectrum expression of wide area Opposed Current ratio |
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| CN116223997A (en) * | 2023-05-06 | 2023-06-06 | 华北电力科学研究院有限责任公司 | Method and device for determining turn-to-turn discharge quantity of transformer winding |
| CN116223997B (en) * | 2023-05-06 | 2023-08-11 | 华北电力科学研究院有限责任公司 | Method and device for determining turn-to-turn discharge quantity of transformer winding |
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