CN105954654A - Fault diagnosis method and system for transformer induction type impulse voltage withstanding test - Google Patents
Fault diagnosis method and system for transformer induction type impulse voltage withstanding test Download PDFInfo
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- CN105954654A CN105954654A CN201610265050.1A CN201610265050A CN105954654A CN 105954654 A CN105954654 A CN 105954654A CN 201610265050 A CN201610265050 A CN 201610265050A CN 105954654 A CN105954654 A CN 105954654A
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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
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- General Physics & Mathematics (AREA)
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a fault diagnosis method and system for a transformer induction type impulse voltage withstanding test. The method uses a low-voltage standard impulse voltage generator to apply voltage to the low voltage winding of a tested transformer, and forms a high amplitude impulse voltage on the high voltage winding of the tested transformer. In the test, the input voltage signal of the low voltage winding and the output voltage signal of the high voltage winding are collected to calculate a transfer function. The fault diagnosis of the transformer is carried out by comparing the frequency change of the extreme points of the transfer function at different test voltages.
Description
Technical field
It relates to transformer field impact test field, particularly relate to a kind of transformer induction formula impact
Testing failure diagnostic method and system thereof.
Background technology
Transformator is the nucleus equipment of electrical network, is the heart of electrical network, and its safe operation is related to whole electrical network
Safe operation.Impulse withstand voltage test is the routine test of more than 220kV transformator, the most at the scene
The impulse withstand voltage test carrying out transformator is the last examination together before putting into operation transformator, and this is for ensureing
The safe operation of transformator is significant.
Conventional impulse withstand voltage test uses impulse voltage generator directly to apply impact from step-up side
Voltage, but this method is the highest to the requirement of impulse voltage generator, and equipment volume is the biggest, it is difficult to transport
And field conduct.The winding turns of transformator is insulated and has strict examination by impulse withstand voltage test, but due to
The attenuation characteristic of surge voltage, i.e. there occurs the accidents such as turn insulation punctures in process of the test, it is also difficult to from
Sound, outward appearance are found out, now need method for diagnosing faults more accurately.
Summary of the invention
Present disclosure proposes a kind of input utilizing transformator and the entirety of output voltage waveforms calculating transformer
The method of transmission function carries out the fault diagnosis in the test of transformer induction formula impulse withstand voltage.Traditional transformation
Device transmission function method for diagnosing faults is applied to directly apply formula, can only diagnose tested winding, this
Disclosure is applied in the test of transformer induction formula impulse withstand voltage, can examine transformator integral insulation state
Disconnected.
A kind of transformer induction impulse withstand voltage testing failure diagnostic method, described method comprises the steps:
Step (1): tested transformator is applied the first input voltage, it is thus achieved that the first output voltage；Described
One input voltage will not make tested transformator produce fault；
Step (2): tested transformator is applied the second input voltage, it is thus achieved that the second output voltage；Described
Two input voltages may make tested transformator produce fault；
Step (3): the first input voltage, the first output voltage input transmission function are obtained the first transmission letter
Number；Second input voltage, the second output voltage input transmission function are obtained the second transmission function；Described
Transmission function is the function characterizing tested transformer fault state；
Step (4): calculate the first transmission function, the second transmission respective maximum of function respectively；
Step (5): the maximum of the second transmission function and the maximum of the first transmission function are compared,
Carry out fault diagnosis.
Additionally, the disclosure further discloses a kind of transformer induction impulse withstand voltage testing failure diagnosis it is
System, described system includes that tested transformator, the first test voltage apply module, the second test voltage applies
Module, computing module, judge module；
Described first test voltage applies module, is used for: tested transformator is applied the first input voltage,
Obtain the first output voltage, and the first input voltage and the first output voltage are exported to computing module；Institute
Stating the first input voltage will not make tested transformator produce fault；
Described second test voltage applies module, is used for: tested transformator is applied the second input voltage,
Obtain the second output voltage, and the second input voltage and the second output voltage are exported to computing module；Institute
Stating the second input voltage may make tested transformator produce fault；
Described computing module, is used for: by the first input voltage, the first output voltage input transmission function
Obtain the first transmission function, the second input voltage, the second output voltage input transmission function are obtained second
After transmission function, calculate the first transmission function, the second transmission respective maximum of function respectively, and by institute
State the first transmission function, the second transmission respective maximum of function exports to judge module；Described transmission letter
Number is the function characterizing tested transformer fault state；
Described judge module, is used for: by maximum and the maximum of the first transmission function of the second transmission function
Value compares, and carries out fault diagnosis.
This method for diagnosing faults is applied in the test of transformer induction formula impulse withstand voltage, by relatively different examinations
The maximum of the transmission function of electrical verification pressure carries out fault diagnosis, and described transmission function is that description is whole tested
The function of transformator.The fault diagnosis of described method is based on quantifying to judge, simple, objective and accurate.
Accompanying drawing explanation
Circuit connection diagram in mono-embodiment of Fig. 1；
In figure: 1 is standard impulse voltage generator, 2 is the dividing potential drop in parallel with standard impulse voltage generator
Device, 3 is tested transformer low voltage winding terminals, and 4 is tested transformer high-voltage winding terminals, and 5 is tested
Transformator, 6 are and the potentiometer of tested transformer high-voltage winding parallel.
Detailed description of the invention
Pin a kind of transformer induction impulse withstand voltage testing failure diagnostic method of this disclosure, with regard to this fault
For diagnostic method, described method comprises the steps:
Step (1): tested transformator is applied the first input voltage, it is thus achieved that the first output voltage；Described
One input voltage will not make tested transformator produce fault；
Step (2): tested transformator is applied the second input voltage, it is thus achieved that the second output voltage；Described
Two input voltages may make tested transformator produce fault；
Step (3): the first input voltage, the first output voltage input transmission function are obtained the first transmission letter
Number；Second input voltage, the second output voltage input transmission function are obtained the second transmission function；Described
Transmission function is the function characterizing tested transformer fault state；
Step (4): calculate the first transmission function, the second transmission respective maximum of function respectively；
Step (5): the maximum of the second transmission function and the maximum of the first transmission function are compared,
Carry out fault diagnosis.
For above-described embodiment, the present embodiment has fully demonstrated the core thinking of the disclosure: i.e.:
In process of the test, voltages different to the input of tested transformator and the collection of corresponding output voltage signal, calculate
To transmission function, carry out transformation by comparing the transmission function maxima situation of change under different tests voltage
The fault diagnosis of device.
Described method relatively conventional transformator transmission function method for diagnosing faults be applied to directly apply formula,
Can only diagnose tested winding, the disclosure is applied in the test of transformer induction formula impulse withstand voltage, can
Transformator integral insulation state is diagnosed.
When carrying out the test of transformer induction formula impulse withstand voltage, use low-voltage standard impulse voltage device to quilt
Examination transformer low voltage winding charge, forms amplitude surge voltage on tested transformer high-voltage winding.?
In process of the test, tested transformator is carried out twice electric discharge.By twice tested transformer low voltage winding charge
Voltage respectively as described first input voltage, the second input voltage；By twice by high pressure before pilot
The surge voltage formed in group is as described first output voltage, the second output voltage.
In one embodiment, it is provided that transmit the computing formula of function described in step (3), i.e. transmit
Function H (Uin, Uout) is:
In formula: the voltage signal inputting tested transformator is transformed into by function fft by fast Fourier transform
Frequency domain；Uout is the output voltage signal of tested transformator；Uin is the input voltage of tested transformator
Signal.
In one embodiment, it is provided that the implementation compared described in step (5) includes: calculate the
The maximum of two transmission functions is relative to the rate of change of the maximum of the first transmission function.
Further, in one embodiment, it is provided that the judgement side of fault diagnosis described in step (5)
Method includes: if described rate of change exceedes ± 5%, then judge that tested transformator exists insulation fault.
For ease of skilled artisan understands that the disclosure, example below combines accompanying drawing 1 to disclosure side
Method is illustrated.
In one embodiment, as shown in Figure 1, wherein (1) is that standard impulse voltage is sent out in test loop
Raw device, (2) are the potentiometer in parallel with standard impulse voltage generator, therefrom obtain the defeated of low pressure winding
Entering voltage signal U1, (3) are tested transformer low voltage winding terminals, and (4) are tested transformer high-voltage
Winding terminals, (5) are tested transformator, and (6) are and the dividing potential drop of tested transformer high-voltage winding parallel
Device, it is thus achieved that the voltage signal U2 of high pressure winding.
When to tested transformator in vicarious impulse voltage test, carry out fault diagnosis concretely comprise the following steps:
Step 1. applies 50% test voltage to tested transformator, it is thus achieved that the first input voltage U1, first is defeated
Go out voltage U2；
Step 2. calculates the first transfer function H according to the first input voltage U1, the first output voltage U2；
Step 3. applies 100% test voltage to tested transformator, it is thus achieved that the second input voltage U1 ', and second
Output voltage U2 ',；
Step 4. calculates the second transfer function H according to the second input voltage U1 ', the second output voltage U2 ' '；
Step 5. calculates the first transfer function H and the second transfer function H respectively ' maximum Max (H '),
Max(H)；
If the maximum rate of change that step 6. second transfer function H 1 ' compares the first transfer function H 1 exceedes
± 5%, then judge that tested transformator exists insulation fault；Wherein:
In the present embodiment, select 50% test voltage as the first input voltage, be based on the assumption that 50% examination
Electrical verification pressure is trouble-free, actual 50% test voltage that need not be confined to, any less than trouble-free magnitude of voltage
?.In like manner, 100% test voltage is higher, then there may be fault, it is also possible to select to think that have can
The magnitude of voltage of fault can be there is as the second input voltage.
Additionally, the disclosure further discloses a kind of transformer induction impulse withstand voltage testing failure diagnosis it is
System, described system includes that tested transformator, the first test voltage apply module, the second test voltage applies
Module, computing module, judge module.
Described first test voltage applies module, is used for: tested transformator is applied the first input voltage,
Obtain the first output voltage, and the first input voltage and the first output voltage are exported to computing module；Institute
Stating the first input voltage will not make tested transformator produce fault.
Described second test voltage applies module, is used for: tested transformator is applied the second input voltage,
Obtain the second output voltage, and the second input voltage and the second output voltage are exported to computing module；Institute
Stating the second input voltage may make tested transformator produce fault.
When carrying out the test of transformer induction formula impulse withstand voltage, use low-voltage standard impulse voltage device to quilt
Examination transformer low voltage winding charge, forms amplitude surge voltage on tested transformer high-voltage winding.?
In process of the test, tested transformator is carried out twice electric discharge.Therefore, in this impulse withstand voltage test method
In, described first input voltage, the second input voltage are tested transformer low voltage winding voltage；Described
One output voltage, the second output voltage are tested transformer high-voltage winding voltage.
Described computing module, is used for: by the first input voltage, the first output voltage input transmission function
Obtain the first transmission function, the second input voltage, the second output voltage input transmission function are obtained second
After transmission function, calculate the first transmission function, the second transmission respective maximum of function respectively, and by institute
State the first transmission function, the second transmission respective maximum of function exports to judge module；Described transmission letter
Number is the function characterizing tested transformer fault state.
Preferably, the computing formula of described transfer function H (Uin, Uout) is:
In formula: the voltage signal inputting tested transformator is transformed into by function fft by fast Fourier transform
Frequency domain；Uout is the output voltage signal of tested transformator；Uin is the input voltage of tested transformator
Signal.
Described judge module, is used for: by maximum and the maximum of the first transmission function of the second transmission function
Value compares, and carries out fault diagnosis.Further, the implementation of described comparison is: calculate second
The maximum of transmission function is relative to the rate of change of the maximum of the first transmission function.Further, described
The determination methods of fault diagnosis includes: if described rate of change exceedes ± 5%, then judge that tested transformator exists
Insulation fault.
Above the disclosure is described in detail, specific case principle of this disclosure used herein
And embodiment is set forth, the explanation of above example is only intended to help and understands disclosed method
And core concept；Simultaneously for those skilled in the art, according to the thought of the disclosure, concrete real
Executing and all will change in mode and range of application, in sum, this specification content should not be construed as
Restriction of this disclosure.
Claims (10)
1. a transformer induction impulse withstand voltage testing failure diagnostic method, it is characterised in that described method
Comprise the steps:
Step (1): tested transformator is applied the first input voltage, it is thus achieved that the first output voltage；Described
One input voltage will not make tested transformator produce fault；
Step (2): tested transformator is applied the second input voltage, it is thus achieved that the second output voltage；Described
Two input voltages may make tested transformator produce fault；
Step (3): the first input voltage, the first output voltage input transmission function are obtained the first transmission letter
Number；Second input voltage, the second output voltage input transmission function are obtained the second transmission function；Described
Transmission function is the function characterizing tested transformer fault state；
Step (4): calculate the first transmission function, the second transmission respective maximum of function respectively；
Step (5): the maximum of the second transmission function and the maximum of the first transmission function are compared,
Carry out fault diagnosis.
Method the most according to claim 1, it is characterised in that:
Preferably, described first input voltage, the second input voltage are tested transformer low voltage winding voltage；
Described first output voltage, the second output voltage are tested transformer high-voltage winding voltage.
Method the most according to claim 2, it is characterised in that described transmission function
The computing formula of H (Uin, Uout) is:
In formula: the voltage signal inputting tested transformator is converted by function fft by fast Fourier transform
To frequency domain；
Uout is the output voltage signal of tested transformator；
Uin is the input voltage signal of tested transformator.
Method the most according to claim 3, it is characterised in that the implementation of described comparison includes:
Calculate the maximum rate of change relative to the maximum of the first transmission function of the second transmission function.
Method the most according to claim 4, it is characterised in that the determination methods of described fault diagnosis
Including:
If described rate of change exceedes ± 5%, then judge that tested transformator exists insulation fault.
6. a transformer induction impulse withstand voltage testing failure diagnostic system, it is characterised in that described system
Including tested transformator, the first test voltage applies module, the second test voltage applies module, calculate mould
Block, judge module；
Described first test voltage applies module, is used for: tested transformator is applied the first input voltage,
Obtain the first output voltage, and the first input voltage and the first output voltage are exported to computing module；Institute
Stating the first input voltage will not make tested transformator produce fault；
Described second test voltage applies module, is used for: tested transformator is applied the second input voltage,
Obtain the second output voltage, and the second input voltage and the second output voltage are exported to computing module；Institute
Stating the second input voltage may make tested transformator produce fault；
Described computing module, is used for: by the first input voltage, the first output voltage input transmission function
Obtain the first transmission function, the second input voltage, the second output voltage input transmission function are obtained second
After transmission function, calculate the first transmission function, the second transmission respective maximum of function respectively, and by institute
State the first transmission function, the second transmission respective maximum of function exports to judge module；Described transmission letter
Number is the function characterizing tested transformer fault state；
Described judge module, is used for: by maximum and the maximum of the first transmission function of the second transmission function
Value compares, and carries out fault diagnosis.
System the most according to claim 6, it is characterised in that:
Described first input voltage, the second input voltage are tested transformer low voltage winding voltage；
Described first output voltage, the second output voltage are tested transformer high-voltage winding voltage.
System the most according to claim 7, it is characterised in that described transmission function
The computing formula of H (Uin, Uout) is:
In formula: the voltage signal inputting tested transformator is transformed into by function fft by fast Fourier transform
Frequency domain；
Uout is the output voltage signal of tested transformator；
Uin is the input voltage signal of tested transformator.
System the most according to claim 8, it is characterised in that the implementation of described comparison is:
Calculate the maximum rate of change relative to the maximum of the first transmission function of the second transmission function.
System the most according to claim 9, it is characterised in that the judgement side of described fault diagnosis
Method includes:
If described rate of change exceedes ± 5%, then judge that tested transformator exists insulation fault.
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| CN201610265050.1A CN105954654B (en) | 2016-04-26 | 2016-04-26 | A kind of transformer induction formula impulse withstand voltage testing failure diagnostic method and system |
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| CN201610265050.1A CN105954654B (en) | 2016-04-26 | 2016-04-26 | A kind of transformer induction formula impulse withstand voltage testing failure diagnostic method and system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108267660A (en) * | 2018-03-21 | 2018-07-10 | 广东电网有限责任公司电力科学研究院 | A kind of Diagnosis Method of Transformer Faults and device |
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Cited By (2)
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| CN108267660A (en) * | 2018-03-21 | 2018-07-10 | 广东电网有限责任公司电力科学研究院 | A kind of Diagnosis Method of Transformer Faults and device |
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| CN105954654B (en) | 2018-10-16 |
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