CN105352427A - On-line detection method for detecting deformation of transformer winding - Google Patents

On-line detection method for detecting deformation of transformer winding Download PDF

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Publication number
CN105352427A
CN105352427A CN201510678698.7A CN201510678698A CN105352427A CN 105352427 A CN105352427 A CN 105352427A CN 201510678698 A CN201510678698 A CN 201510678698A CN 105352427 A CN105352427 A CN 105352427A
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formula
transformer
signal port
transformer winding
current probe
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CN105352427B (en
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卢旻
吴绍武
严伟
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State Grid Corp of China SGCC
HuaiAn Power Supply Co of State Grid Jiangsu Electric Power Co Ltd
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State Grid Corp of China SGCC
HuaiAn Power Supply Co of State Grid Jiangsu Electric Power Co Ltd
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00Measuring arrangements characterised by the use of electric or magnetic means
    • G01B7/16Measuring arrangements characterised by the use of electric or magnetic means for measuring the deformation in a solid, e.g. by resistance strain gauge

Abstract

The invention discloses an on-line detection method for detecting the deformation of a transformer winding. The method comprises the steps: installing an injection current probe at a primary side of a transformer and a detection current probe at a secondary side of the transformer under the condition that the power of the transformer is not cut off, wherein the injection current probe is connected to a signal port 1 of a vector network analyzer, and the detection current probe is connected to a signal port 2 of the vector network analyzer; obtaining a reflection coefficient S11 of the signal port 1, and a transmission coefficient S21 from the signal port 2 to the signal port 1; and calculating the resistance, inductance and capacitance components of the transformer winding according to a calculated winding impedance Z of the transformer. According to the invention, signals are inputted or outputted through a cable connected with the transformer winding. The method is safe and convenient, is wide in application range, and can provide theoretical basis for the research of the quick diagnosis, quick response, quick early warning and remote monitoring of a fault of the transformer winding and the magnetic saturation characteristics, exciting current and sympathetic surge current of the transformer.

Description

A kind of deformation of transformer winding amount online test method
Technical field
The present invention relates to field transformer, be specifically related to a kind of deformation of transformer winding amount online test method.
Background technology
The reason causing deformation of transformer winding fault is more, mainly comprises following six aspects:
1) short-circuit current impacts is the main external cause causing deformation of transformer winding fault.Transformer is in operational process, inevitably suffer the impact of various big current, particularly transformer outlet or near region short trouble, huge short-circuit impact electric current by make Transformer Winding be subject to very large electric power (be normally run time decades of times to hundreds of times), each coil will be subject to powerful radial force and the acting in conjunction of axial force, and winding is sharply generated heat, at a higher temperature, the physical strength of wire diminishes, and electric power more easily makes winding destroy or distortion.
2) rush of current is one of external cause causing winding deformation of power transformer fault.Electric railway, the large-scale impact loads such as electric arc furnaces and heavy current test station can produce serious rush of current, Transformer Winding will produce mechanically deform after bearing rush of current, cause winding inter-turn, interlayer, wait between cake and insulation damages occurs, even if small deformation, if can not Timeliness coverage, because cumulative effect also can cause damage in insulation between winding progressively to aggravate, again suffer short-circuit impact, when switching overvoltage or even operating voltage effect, winding insulation will be caused to puncture, finally cause transformer improper out of service, cause major industrial accident.
3) winding insulation support member comes off also is one of origin cause of formation causing winding deformation of power transformer fault.In operational process, winding insulation support member comes off and happens occasionally, due to this problem not immediately initiating failure and routine test also cannot detect, cause winding failure more serious along with the time of putting into operation increases, finally cause serious security incident.
4) power transformer in transport, install or hang in cover process, the collision be surprisingly subject to, to jolt and vibration etc. also can cause winding deformation fault.
5) there is dead band or the malfunctioning meeting of action to cause transformer to bear time of steady short-circuit current effect long in protection system; also be one of reason causing deformation of transformer winding fault; rough Statistics result shows; when suffering external short circuit, the transformer be damaged because not tripping in time accounts for 30% of Damage by Short Circuit accident.
6) Transformer Winding bears short-circuit capacity deficiency is the major endogeneous causing winding deformation of power transformer fault, when short circuit appears in Transformer Winding, can can't stand short-circuit current rush power because it holds and deforms.The statistics and analysis of national 110kV power transformer accident showed in recent years: because winding bears the primary internal cause that short-circuit capacity deficiency has become power transformer accident, have a strong impact on the safe and reliable operation of power transformer.
Publication No. is method and the device that the Chinese invention patent application of CN103234450A discloses a kind of deformation of transformer winding on-line monitoring, from the end shield input signal of bushing, then outputs signal from end shield; But the end shield of electric power safety production requirement bushing forces ground connection to ensure its zero potential, only in this way guarantee bushing does not cause because of end shield electric potential floating that Keep Clear-High Voltage, input in the technical scheme of this application in the end shield of bushing, output signal, there is potential safety hazard; In addition, 110kV and above transformer is only had just to be equipped with voltage bottom shielding of bushing at present, and most of transformer has multiple electric pressure lower than 110kV such as 10kV, 20kV, 35kV, 66kV, also just do not have voltage bottom shielding of bushing, therefore the technical scheme application surface of this application is very narrow.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of deformation of transformer winding amount online test method, can solve existing deformation of transformer winding on-line monitoring in the input of voltage bottom shielding of bushing, output signal, causes existing the problem that potential safety hazard, application surface are narrow.
The present invention is achieved through the following technical solutions:
A kind of deformation of transformer winding amount online test method, comprises the following steps:
The first step: under the prerequisite of transformer (4) not power-off, at its primary side, Injection Current probe (2) is installed respectively, install at secondary side and detect current probe (3), described Injection Current probe (2) is connected to the signal port 1 of vector network analyzer (1), detects the signal port 2 that current probe (3) is connected to vector network analyzer (1);
Second step: the survey frequency arranging vector network analyzer (1) is 10kHz to 10MHz, obtains the reflection coefficient of signal port 1 s 11, and the transmission coefficient of signal port 2 to signal port 1 s 21, according to the winding impedance of formula (1) calculating transformer (4) z, described formula (1) is:
In formula, k 1with k 2be respectively the coefficient of migration of Injection Current probe and detection current probe;
3rd step: the Transformer Winding impedance Z utilizing second step to obtain, according to the resistance of formula (2) calculating transformer winding, inductance and capacitive component, described formula (2) is:
In formula, r, l, cbe respectively the resistance of Transformer Winding, inductance and electric capacity, j is imaginary unit, ωfor angular frequency, ffor frequency, ω=2 π f;
Formula (3) can be obtained by formula (2):
Order f 2= x 1, f -2= x -1, formula (4) can be obtained by formula (3):
In formula, x t=[ x -1, x 1], z=[ r, l, c];
If the measurement frequency of Transformer Winding impedance is nindividual, can obtain ngroup data (x -1n, x 1n, y n),
First given one group of initial value, is designated as z (0), namely
Will f( x t, z) z (0)the item of more than secondary and secondary by Taylor series expansion, and omits in place, can obtain formula (5):
In formula, z=[ r, l, c], utilize least square method can obtain formula (6):
In formula, damping factor d >=0;
Order qright r, l, cfirst-order partial derivative be zero, formula (7) can be obtained:
, make in formula k=1,2,3; Formula (8) can be obtained:
In formula, , i=1,2,3; j=1,2,3, formula (9) can be obtained:
The i.e. resistance of Transformer Winding, inductance and capacitive component;
4th step: according to IEC61850-9-1 and IEC61850-9-2 standard, is converted to normal data frame by the test result of the 3rd step, is uploaded to Surveillance center by wireless or cable network.
The present invention's advantage is compared with prior art:
One, input on the cable of connection transformer winding, output signal, safe ready, wide application, can be the quick diagnosis of transformer winding fault, fast response, fast early warning and remote monitoring, and the magnetic saturation characteristic of transformer, excitation surge current and sympathetic inrush Study on Problems provide theoretical foundation;
Two, implementation cost is lower, and 1 can be adopted to drag the N method of operation (by system in succession, a multiple deformation of transformer winding fault of the same website of hosted diagnostic can be realized), for winding deformation of power transformer fault diagnosis, early warning, monitoring, shorten emergency repair time, save the cost of overhaul, safeguard that safe operation of power system provides theoretical foundation and practical advice.
Accompanying drawing explanation
Fig. 1 is hardware configuration schematic diagram of the present invention.
Embodiment
A kind of deformation of transformer winding amount online test method, comprises the following steps:
The first step: under the prerequisite of transformer (4) not power-off, at its primary side, Injection Current probe (2) is installed respectively, install at secondary side and detect current probe (3), described Injection Current probe (2) is connected to the signal port 1 of vector network analyzer (1), detects the signal port 2 that current probe (3) is connected to vector network analyzer (1);
Second step: the survey frequency arranging vector network analyzer (1) is 10kHz to 10MHz, obtains the reflection coefficient of signal port 1 s 11, and the transmission coefficient of signal port 2 to signal port 1 s 21, according to the winding impedance of formula (1) calculating transformer (4) z, described formula (1) is:
In formula, k 1with k 2be respectively the coefficient of migration of Injection Current probe and detection current probe;
3rd step: the Transformer Winding impedance Z utilizing second step to obtain, according to the resistance of formula (2) calculating transformer winding, inductance and capacitive component, described formula (2) is:
In formula, r, l, cbe respectively the resistance of Transformer Winding, inductance and electric capacity, j is imaginary unit, ωfor angular frequency, ffor frequency, ω=2 π f;
Formula (3) can be obtained by formula (2):
Order f 2= x 1, f -2= x -1, formula (4) can be obtained by formula (3):
In formula, x t=[ x -1, x 1], z=[ r, l, c];
If the measurement frequency of Transformer Winding impedance is nindividual, can obtain ngroup data (x -1n, x 1n, y n),
First given one group of initial value, is designated as z (0), namely
Will f( x t, z) z (0)the item of more than secondary and secondary by Taylor series expansion, and omits in place, can obtain formula (5):
In formula, z=[ r, l, c], utilize least square method can obtain formula (6):
In formula, damping factor d >=0;
Order qright r, l, cfirst-order partial derivative be zero, formula (7) can be obtained:
, make in formula k=1,2,3; Formula (8) can be obtained:
In formula, , i=1,2,3; j=1,2,3, formula (9) can be obtained:
The i.e. resistance of Transformer Winding, inductance and capacitive component;
4th step: according to IEC61850-9-1 and IEC61850-9-2 standard, is converted to normal data frame by the test result of the 3rd step, is uploaded to Surveillance center by wireless or cable network.

Claims (1)

1. a deformation of transformer winding amount online test method, is characterized in that comprising the following steps:
The first step: under the prerequisite of transformer (4) not power-off, at its primary side, Injection Current probe (2) is installed respectively, install at secondary side and detect current probe (3), described Injection Current probe (2) is connected to the signal port 1 of vector network analyzer (1), detects the signal port 2 that current probe (3) is connected to vector network analyzer (1);
Second step: the survey frequency arranging vector network analyzer (1) is 10kHz to 10MHz, obtains the reflection coefficient of signal port 1 s 11, and the transmission coefficient of signal port 2 to signal port 1 s 21, according to the winding impedance of formula (1) calculating transformer (4) z, described formula (1) is:
In formula, k 1with k 2be respectively the coefficient of migration of Injection Current probe and detection current probe;
3rd step: the Transformer Winding impedance Z utilizing second step to obtain, according to the resistance of formula (2) calculating transformer winding, inductance and capacitive component, described formula (2) is:
In formula, r, l, cbe respectively the resistance of Transformer Winding, inductance and electric capacity, j is imaginary unit, ωfor angular frequency, ffor frequency, ω=2 π f;
Formula (3) can be obtained by formula (2):
Order f 2= x 1, f -2= x -1, formula (4) can be obtained by formula (3):
In formula, x t=[ x -1, x 1], z=[ r, l, c];
If the measurement frequency of Transformer Winding impedance is nindividual, can obtain ngroup data (x -1n, x 1n, y n),
First given one group of initial value, is designated as z (0), namely
Will f( x t, z) z (0)the item of more than secondary and secondary by Taylor series expansion, and omits in place, can obtain formula (5):
In formula, z=[ r, l, c], utilize least square method can obtain formula (6):
In formula, damping factor d >=0;
Order qright r, l, cfirst-order partial derivative be zero, formula (7) can be obtained:
, make in formula k=1,2,3; Formula (8) can be obtained:
In formula, , i=1,2,3; j=1,2,3, formula (9) can be obtained:
The i.e. resistance of Transformer Winding, inductance and capacitive component;
4th step: according to IEC61850-9-1 and IEC61850-9-2 standard, is converted to normal data frame by the test result of the 3rd step, is uploaded to Surveillance center by wireless or cable network.
CN201510678698.7A 2015-10-20 2015-10-20 A kind of deformation of transformer winding amount online test method Active CN105352427B (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107037311A (en) * 2016-10-27 2017-08-11 国家电网公司 A kind of Transformer Winding turn-to-turn insulation method for diagnosing faults and device
CN108196180A (en) * 2017-12-14 2018-06-22 国网江苏省电力有限公司淮安供电分公司 A kind of shunt capacitor online circuit parameter detection method
CN109387705A (en) * 2018-09-14 2019-02-26 国网江苏省电力有限公司淮安供电分公司 A kind of shunt capacitor presence monitoring system
CN110168386A (en) * 2017-02-17 2019-08-23 道波工程公司 System and method for executing transformer diagnosis

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5421523A (en) * 1977-07-18 1979-02-17 Mitsubishi Electric Corp Axial displacement detector for transformer winding
US20100211339A1 (en) * 2007-09-27 2010-08-19 Prasad Madhukar Joshi Diagnostic method for determining deformations in a transformer winding
CN101930047A (en) * 2010-08-27 2010-12-29 西安交通大学 On-line monitoring device of transformer winding state and monitoring method thereof
US20120130663A1 (en) * 2009-07-23 2012-05-24 Indian Institute Of Technology, Bombay On-line diagnostic method for health monitoring of a transformer
CN103217579A (en) * 2012-12-28 2013-07-24 富阳市供电局 On-line monitoring system of transformer winding
CN103438797A (en) * 2013-07-31 2013-12-11 广东电网公司汕头供电局 Method and system for on-line detection of transformer winding deformation
CN104061850A (en) * 2014-07-03 2014-09-24 国家电网公司 Device for detecting deformation of transformer winding based on pulse on-line injection

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5421523A (en) * 1977-07-18 1979-02-17 Mitsubishi Electric Corp Axial displacement detector for transformer winding
US20100211339A1 (en) * 2007-09-27 2010-08-19 Prasad Madhukar Joshi Diagnostic method for determining deformations in a transformer winding
US20120130663A1 (en) * 2009-07-23 2012-05-24 Indian Institute Of Technology, Bombay On-line diagnostic method for health monitoring of a transformer
CN101930047A (en) * 2010-08-27 2010-12-29 西安交通大学 On-line monitoring device of transformer winding state and monitoring method thereof
CN103217579A (en) * 2012-12-28 2013-07-24 富阳市供电局 On-line monitoring system of transformer winding
CN103438797A (en) * 2013-07-31 2013-12-11 广东电网公司汕头供电局 Method and system for on-line detection of transformer winding deformation
CN104061850A (en) * 2014-07-03 2014-09-24 国家电网公司 Device for detecting deformation of transformer winding based on pulse on-line injection

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107037311A (en) * 2016-10-27 2017-08-11 国家电网公司 A kind of Transformer Winding turn-to-turn insulation method for diagnosing faults and device
CN110168386A (en) * 2017-02-17 2019-08-23 道波工程公司 System and method for executing transformer diagnosis
US11156671B2 (en) 2017-02-17 2021-10-26 Doble Engineering Company System and method for performing transformer diagnostics
CN110168386B (en) * 2017-02-17 2022-03-15 道波工程公司 System and method for performing transformer diagnostics
CN108196180A (en) * 2017-12-14 2018-06-22 国网江苏省电力有限公司淮安供电分公司 A kind of shunt capacitor online circuit parameter detection method
CN109387705A (en) * 2018-09-14 2019-02-26 国网江苏省电力有限公司淮安供电分公司 A kind of shunt capacitor presence monitoring system

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