CN107817413A - The method of unshorting Resistance Influence in the experiment of transformer low-voltage short-circuit impedance - Google Patents

The method of unshorting Resistance Influence in the experiment of transformer low-voltage short-circuit impedance Download PDF

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Publication number
CN107817413A
CN107817413A CN201711005445.9A CN201711005445A CN107817413A CN 107817413 A CN107817413 A CN 107817413A CN 201711005445 A CN201711005445 A CN 201711005445A CN 107817413 A CN107817413 A CN 107817413A
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China
Prior art keywords
switch
voltage
short
transformer
resistance
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CN201711005445.9A
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Chinese (zh)
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CN107817413B (en
Inventor
林滔
徐育福
陈闽江
林忠立
刘旭
孙熊飞
王腾滨
陈智
林丹丹
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State Grid Corp of China SGCC
State Grid Fujian Electric Power Co Ltd
Maintenance Branch of State Grid Fujian Electric Power Co Ltd
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State Grid Corp of China SGCC
State Grid Fujian Electric Power Co Ltd
Maintenance Branch of State Grid Fujian Electric Power Co Ltd
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Publication of CN107817413A publication Critical patent/CN107817413A/en
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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
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/62—Testing of transformers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Measurement Of Resistance Or Impedance (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

A kind of method of unshorting Resistance Influence in being tested the present invention relates to transformer low-voltage short-circuit impedance.Low-voltage short-circuit impedance tester is provided, include the first switch at the both ends for connecting step down side, and the second switch at the both ends for connecting step down side, first switch includes hanging, electric current output, current measurement gear, second switch includes hanging, voltage measurement gear, and the low-voltage short-circuit impedance tester is also connected with high voltage side of transformer.The inventive method can exclude unshorting Resistance Influence in the experiment of low-voltage short-circuit impedance.

Description

The method of unshorting Resistance Influence in the experiment of transformer low-voltage short-circuit impedance
Technical field
The invention belongs to substation equipment maintenance and repair electrical test field in power system, and in particular to a kind of transformer low-voltage short circuit The method of unshorting Resistance Influence in impedance experiments.
Background technology
Transformer low-voltage short-circuit impedance test connection such as Fig. 1（By taking single-phase transformer as an example）,
By step down side ab short circuits, pressed by high pressure and survey AB input low-voltages（General 220V or so）, electricity is measured from high-pressure side Stream, so as to calculate the low-voltage short-circuit impedance value of the transformer.Its impedance value：
Z=U/I=（X2+R2）1/2
Existing low-voltage short-circuit impedance tester can go out reactance X and resistance R value with direct measurement.Wherein X determines idle damage Consumption, R determine active loss.Active loss in the experiment mainly has transformer open circuit loss at this voltage and low-pressure side Resistance loss caused by resistance r.
Ideally, low-pressure side ab short-circuit resistances are 0, but during practical operation, usually due to poor short circuit, cause R inclined Greatly, cause result of the test deviation larger.
At present, the mode short circuit low-pressure side of bare copper wire winding is commonly used in practice.For the higher transformer of voltage class, by It is larger in itself short-circuit impedance value, therefore it is smaller to use bare copper wire winding to influence result of the test.But for voltage class compared with ground Transformer, because itself short-circuit impedance is little, therefore by the way of the direct short circuit of bare copper wire, its additional resistance value is always surveyed Accounting is larger in amount impedance, and measurement data is easily exceeded, and measurement effect is bad.
Shortcoming and deficiency be present in prior art：
It is relatively low for voltage class（Capacity is smaller）Transformer, because itself short-circuit impedance is little, thus use bare copper wire it is straight The mode of short circuit is connect, accounting is larger in its additional resistance value overall measurement impedance, and measurement data is easily exceeded, and measurement effect is bad.
The content of the invention
Unshorting Resistance Influence in being tested it is an object of the invention to provide a kind of transformer low-voltage short-circuit impedance Method, unshorting Resistance Influence in the experiment of low-voltage short-circuit impedance can be excluded.
To achieve the above object, the technical scheme is that：Excluded in a kind of transformer low-voltage short-circuit impedance experiment The method that short-circuit resistance influences, there is provided low-voltage short-circuit impedance tester, including for connecting the both ends of step down side First switch, and the second switch at the both ends for connecting step down side, first switch include hanging, electric current output, Current measurement gear, second switch include hanging, voltage measurement gear, the low-voltage short-circuit impedance tester also with transformer High-pressure side connects；This method is realized as follows：
S1, first switch, second switch be switched to vacantly, in high voltage side of transformer input voltage U, and measure electric current I0, obtain Unloaded active loss P under to voltage U0；
S2, first switch is switched to electric current output gear, second switch is switched to voltage measurement gear so that high voltage side of transformer hangs Sky, measuring transformer high-pressure side winding D.C. resistance r；
S3, first switch is switched to current measurement gear, second switch is switched to hanging gear, and now first switch is equivalent to short Road, in high voltage side of transformer input voltage U, and measure input measurement electric current I；It is I now to have measurement electric current at first switch1； According to short-circuit impedance formula：
Z=U/I=（X2+R2）1/2
Wherein, R is influenceed by three parts：The equivalent resistance r of open circuit loss0, voltage survey D.C. resistance r, short-circuit additional resistance rx
Now to exclude rxInfluence；Assuming that exclude rxResistance after influence is R ', then below equation is set up
U2/ R’= I1 2r+P0
That is R '=U2/（I1 2r+P0）
By R ' replace R can unshorting additional resistance influence；That is Z=U/I=（X2+R’2）1/2。
Compared to prior art, the invention has the advantages that：
1st, existing test method can not exclude the influence of additional resistance, and this method is by measurement and calculates, and can exclude completely The influence of additional resistance, improve the accuracy of experiment；
2nd, p-wire need to only be accessed instrument and accurate measurement can be achieved by this method, reduced the workload of winding copper cash, improved Operating efficiency.
Brief description of the drawings
Fig. 1 is transformer low-voltage short-circuit impedance test connection figure.
Fig. 2 is the inventive method wiring diagram.
Fig. 3 is Fig. 2 local P enlarged drawings.
Embodiment
2-3 below in conjunction with the accompanying drawings, technical scheme is specifically described.
The method of unshorting Resistance Influence in a kind of transformer low-voltage short-circuit impedance experiment of the present invention, there is provided low electricity Short-circuit impedance tester is pressed, includes the first switch at the both ends for connecting step down side, and for connecting transformer The second switch at the both ends of low-pressure side, first switch include hanging, electric current output, current measurement gear, and second switch includes outstanding Empty, voltage measurement gear, the low-voltage short-circuit impedance tester are also connected with high voltage side of transformer；This method is realized as follows：
S1, first switch, second switch be switched to vacantly, in high voltage side of transformer input voltage U, and measure electric current I0, obtain Unloaded active loss P under to voltage U0；
S2, first switch is switched to electric current output gear, second switch is switched to voltage measurement gear so that high voltage side of transformer hangs Sky, measuring transformer high-pressure side winding D.C. resistance r；
S3, first switch is switched to current measurement gear, second switch is switched to hanging gear, and now first switch is equivalent to short Road, in high voltage side of transformer input voltage U, and measure input measurement electric current I；It is I now to have measurement electric current at first switch1； According to short-circuit impedance formula：
Z=U/I=（X2+R2）1/2
Wherein, R is influenceed by three parts：The equivalent resistance r of open circuit loss0, voltage survey D.C. resistance r, short-circuit additional resistance rx
Now to exclude rxInfluence；Assuming that exclude rxResistance after influence is R ', then below equation is set up
U2/ R’= I1 2r+P0
That is R '=U2/（I1 2r+P0）
By R ' replace R can unshorting additional resistance influence；That is Z=U/I=（X2+R’2）1/2。
It is below the specific implementation example of the present invention.
The method of unshorting Resistance Influence in a kind of transformer low-voltage short-circuit impedance experiment of the present invention, wherein low electricity As shown in Figure 2,3, test method is as follows for the wiring diagram of pressure short-circuit impedance tester：
It S1, switch C, D will be switched in Fig. 2 at 1, and in high voltage side of transformer input voltage U, and measure electric current I0, obtain voltage U Under unloaded active loss P0；
S2, switch C, D it will be switched in Fig. 2 at 2 so that high voltage side of transformer is hanging, measuring transformer high-pressure side direct current Resistance r（DCR of Transformer is tested）；
S3, C in Fig. 2 is switched to 3 current measurement ends, now C is equivalent to short circuit.D is switched to hanging at 1.It is defeated in high voltage side of transformer Enter voltage U, and measure input measurement electric current I；It is I now to have measurement electric current at first switch1；According to short-circuit impedance formula：
Z=U/I=（X2+R2）1/2
Wherein, R is influenceed by three parts：The equivalent resistance r of open circuit loss0, voltage survey D.C. resistance r, short-circuit additional resistance rx
Now to exclude rxInfluence；Assuming that exclude rxResistance after influence is R ', then below equation is set up
U2/ R’= I1 2r+P0
That is R '=U2/（I1 2r+P0）
By R ' replace R can unshorting additional resistance influence；That is Z=U/I=（X2+R’2）1/2。
Above is presently preferred embodiments of the present invention, all changes made according to technical solution of the present invention, caused function are made During with scope without departing from technical solution of the present invention, protection scope of the present invention is belonged to.

Claims (1)

1. a kind of method of unshorting Resistance Influence in transformer low-voltage short-circuit impedance experiment, it is characterised in that：There is provided low Voltage short-circuit impedance tester, include the first switch at the both ends for connecting step down side, and for connecting transformation The second switch at the both ends of device low-pressure side, first switch include hanging, electric current output, current measurement gear, and second switch includes Vacantly, voltage measurement gear, the low-voltage short-circuit impedance tester are also connected with high voltage side of transformer；This method is realized such as Under：
S1, first switch, second switch be switched to vacantly, in high voltage side of transformer input voltage U, and measure electric current I0, obtain Unloaded active loss P under voltage U0；
S2, first switch is switched to electric current output gear, second switch is switched to voltage measurement gear so that high voltage side of transformer hangs Sky, measuring transformer high-pressure side winding D.C. resistance r；
S3, first switch is switched to current measurement gear, second switch is switched to hanging gear, and now first switch is equivalent to short Road, in high voltage side of transformer input voltage U, and measure input measurement electric current I；It is I now to have measurement electric current at first switch1； According to short-circuit impedance formula：
Z=U/I=（X2+R2）1/2
Wherein, R is influenceed by three parts：The equivalent resistance r of open circuit loss0, voltage survey D.C. resistance r, short-circuit additional resistance rx
Now to exclude rxInfluence；Assuming that exclude rxResistance after influence is R ', then below equation is set up
U2/ R’= I1 2r+P0
That is R '=U2/（I1 2r+P0）
By R ' replace R can unshorting additional resistance influence；That is Z=U/I=（X2+R’2）1/2。
CN201711005445.9A 2017-10-25 2017-10-25 Method for eliminating influence of short-circuit resistance in transformer low-voltage short-circuit impedance test Active CN107817413B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108693432A (en) * 2018-04-27 2018-10-23 国家电网公司 A kind of tester of deformation of transformer winding

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CN103941136A (en) * 2013-12-23 2014-07-23 上海大郡动力控制技术有限公司 Signal sampling circuit resistor-capacitor component short circuit and open circuit fault diagnosis method
CN103901313A (en) * 2014-03-18 2014-07-02 常熟理工学院 Low-voltage circuit breaker main wiring insulation pre-checking device based on piezoelectric ceramic transformer
CN103837792A (en) * 2014-03-21 2014-06-04 山东电力设备有限公司 Device and method for detecting short circuit ring of coils of transformers
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