CN106767375A - Three-phase transformer winding deformation on-line monitoring method based on short circuit impedance method - Google Patents

Three-phase transformer winding deformation on-line monitoring method based on short circuit impedance method Download PDF

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Publication number
CN106767375A
CN106767375A CN201611068330.XA CN201611068330A CN106767375A CN 106767375 A CN106767375 A CN 106767375A CN 201611068330 A CN201611068330 A CN 201611068330A CN 106767375 A CN106767375 A CN 106767375A
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transformer
voltage
short
current
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CN106767375B (en
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欧立新
费雯丽
周宇雄
袁佳歆
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WUHAN ZHENYUAN ELECTRIC EQUIPMENT CO Ltd
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WUHAN ZHENYUAN ELECTRIC EQUIPMENT CO Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

The invention discloses a kind of three-phase transformer winding deformation on-line monitoring method based on short circuit impedance method, it is related to a kind of method for being monitored on-line to three-phase transformer winding deformation.It is included in 6 voltage transformers, 6 current transformers and a Digital Signal Analysis and Processing systems of installation on three-phase transformer, the magnitude of voltage that Digital Signal Analysis and Processing system is detected according to 6 voltage transformers, the current value that 6 current transformers are detected, and the calculating formula of short-circuit impedance calculates the short-circuit reactance of three-phase transformer in three-phase transformer, the real-time short-circuit reactance of the three-phase line that staff will calculate is compared with the short-circuit reactance of standard, so as to judge Transformer Winding with the presence or absence of deformation.It is convenient that the present invention is realized, cost is relatively low, can realize the on-line checking of the short-circuit reactance parameter of transformer, can in real time judge three-phase transformer winding deformation situation.

Description

Three-phase transformer winding deformation on-line monitoring method based on short circuit impedance method
Technical field
The present invention relates to a kind of method for being monitored on-line to three-phase transformer winding deformation, specifically one Plant the three-phase transformer winding deformation on-line monitoring method based on short circuit impedance method.
Background technology
Power transformer is the visual plant in power network, and the safe operation of electrical transformer is to ensureing the normal of power system Operation is of great importance.Because Accident of Transformer accounts for the overwhelming majority of the total accident of transformer, institute caused by deformation of transformer winding With in order to the accident potential of discovery transformer in time, the service life of extension transformer and the whole power system of guarantee Safe and stable operation, the research tool to deformation of transformer winding online test method is of great significance.
Existing theoretical research shows, the short-circuit reactance value of transformer be by physical dimension, locus of winding etc. because Element is determined.When Transformer Winding deforms, its short-circuit reactance value will change, therefore measurement short-circuit reactance change Situation is to judge a kind of effective ways whether Transformer Winding deforms.
At present, the deformation test of transformer winding method based on short circuit impedance method mainly has two classes, and a class is to need to become Depressor disconnects from power network, carries out no-load test and short-circuit test, and this is offline；Another kind of on-line monitoring method, its mathematics meter Calculate model and be directed to single-phase double winding experimental transformer.Therefore, this two classes method is not all applied to actual motion in power network Power transformer carries out the on-line monitoring of short-circuit impedance.
The content of the invention
The invention aims to overcome the weak point of background technology, and provide a kind of based on short circuit impedance method three Phase transformer winding deformation on-line monitoring method.
To achieve these goals, the technical scheme is that：Three-phase transformer winding based on short circuit impedance method becomes Shape on-line monitoring method, it is characterised in that：It comprises the following steps,
Step 1：A first voltage transformer and one are respectively mounted on the three-line of three-phase transformer input First current transformer, is respectively mounted a second voltage transformer and one on the three-line of three-phase transformer output end Second current transformer；
Step 2：Magnitude of voltage that three first voltage transformers are detected, three the first current transformers are detected Current value, the magnitude of voltage that detects of three second voltage transformers and three the second current transformers detect current value and pass Pass data acquisition processing system；
Step 3：, according to the magnitude of voltage of collection, short circuit is electric in current value, and three-phase transformer for data acquisition processing system Anti- calculating formula calculates the short-circuit reactance of three-phase transformer, the real-time short-circuit reactance of the three-phase line that staff will calculate with The short-circuit reactance of standard is compared, so as to judge Transformer Winding with the presence or absence of deformation；
Wherein, short-circuit reactance calculating formula is in three-phase transformer：
Three first voltage transformers are respectively in the input voltage that the input of transformer is detected WithThree first current transformers are respectively in the input current that the input of transformer is detectedWith
Three second voltage transformers are respectively in the input voltage that the output end of transformer is detected WithThree second current transformers are respectively in the output current that the output end of transformer is detectedWith
The no-load voltage ratio of three first voltage transformers is KPT1, the no-load voltage ratio of three first current transformers is KCT1, The no-load voltage ratio of three second voltage transformers is KPT2, the no-load voltage ratio of three second current transformers is KCT2。
The present invention is formed by the tight derivation of equation, by setting up three-phase transformer winding circuit impedance parameter Mathematics computing model, with reliable theory support foundation, can realize the on-line checking of the short-circuit reactance parameter of transformer, can Judge three-phase transformer winding deformation situation in real time.Compared with existing three-phase transformer winding deformation on-line monitoring method, The present invention realizes convenient, it is only necessary to increase by 6 voltage transformers, 6 current transformers and signals in original circuit system The transformer being currently running in power system is monitored on-line by analyzing with processing system (PC), cost is relatively low.Together When, the present invention can be used in combination with existing three-phase transformer winding deformation on-line monitoring method, can be more accurate Help staff judge three-phase transformer winding with the presence or absence of deformation.
Brief description of the drawings
Fig. 1 is the equivalent circuit diagram of three-phase transformer.
Fig. 2 is three-phase transformer short-circuit reactance on-line measurement schematic diagram.
Specific embodiment
The performance that the invention will now be described in detail with reference to the accompanying drawings, but they do not constitute limitation of the invention, only It is for example.Make advantages of the present invention more clear by explanation simultaneously and be readily appreciated that.
Understood refering to accompanying drawing：Three-phase transformer winding deformation on-line monitoring method based on short circuit impedance method, its feature exists In：It comprises the following steps,
Step 1：A first voltage transformer and one are respectively mounted on the three-line of three-phase transformer input First current transformer, is respectively mounted a second voltage transformer and one on the three-line of three-phase transformer output end Second current transformer；
Step 2：Magnitude of voltage that three first voltage transformers are detected, three the first current transformers are detected Current value, the magnitude of voltage that detects of three second voltage transformers and three the second current transformers detect current value and pass Pass data acquisition processing system；
Step 3：, according to the magnitude of voltage of collection, short circuit is electric in current value, and three-phase transformer for data acquisition processing system Anti- calculating formula calculates the short-circuit reactance of three-phase transformer, the real-time short-circuit reactance of the three-phase line that staff will calculate with The short-circuit reactance of standard is compared, so as to judge Transformer Winding with the presence or absence of deformation；
Wherein, short-circuit reactance calculating formula is in three-phase transformer：
Three first voltage transformers are respectively in the input voltage that the input of transformer is detected WithThree first current transformers are respectively in the input current that the input of transformer is detectedWith
Three second voltage transformers are respectively in the input voltage that the output end of transformer is detected WithThree second current transformers are respectively in the output current that the output end of transformer is detectedWith
The no-load voltage ratio of three first voltage transformers is KPT1, the no-load voltage ratio of three first current transformers is KCT1, The no-load voltage ratio of three second voltage transformers is KPT2, the no-load voltage ratio of three second current transformers is KCT2。
During real work, the calculating formula of the short-circuit reactance of three-phase transformer is derived in the following way：
S1：As shown in Figure 2,6 voltage transformers are respectively PT1~PT6, 6 current transformers are respectively CT1~ CT6, voltage transformer pt1~PT6The voltage for detecting is respectively Current transformer CT1~CT6The electric current for detecting is respectively
Voltage transformer pt1~PT3No-load voltage ratio be KPT1, voltage transformer pt4~PT6No-load voltage ratio be KPT2, current transformer CT1~CT3No-load voltage ratio be KCT1, Current Transmit4~CT6No-load voltage ratio be KCT2。
S2：As depicted in figs. 1 and 2, the primary side input voltage of transformer is respectivelyWithThe secondary of transformer Output voltageThe primary side input current of transformer is respectivelyWithSecondary output current is respectively
Transformer actually enters voltage, output voltage, current value, has following relation with the value for measuring：
S3：With reference to the three-phase transformer short-circuit impedance expression formula derived in invention content, three-phase is from which further followed that The expression formula of the short-circuit impedance of Transformer Winding, wherein, the expression formula of the short-circuit impedance of three-phase transformer winding is：
During real work, three-phase transformer short-circuit impedance expression formula is to shift onto out in the following way：
K1：Three-phase primary side input terminal voltage is respectivelyThree-phase primary side input electric current is respectivelyPrimary side neutral node electric current is usedRepresent.Three-phase secondary output end voltage is respectively Three-phase secondary load-side output current (line current) is respectivelyThree-phase secondary flows through the electric current (phase of each winding Electric current) it is respectively
K2：A phase primary sides short-circuit impedance, resistance, reactance are respectively ZA1、RA1、XA1；The impedance of A phase secondary short circuits, resistance, reactance Respectively ZA2、RA2、XA2.B phase primary sides short-circuit impedance, resistance, reactance are respectively ZB1、RB1、XB1；The impedance of B phase secondary short circuits, electricity Resistance, reactance are respectively ZB2、RB2、XB2.C phase primary sides short-circuit impedance, resistance, reactance are respectively ZC1、RC1、XC1；C phases secondary short circuit hinders Anti-, resistance, reactance are respectively ZC2、RC2、XC2.The short-circuit impedance conversion of low-pressure side is surveyed to high pressure, the short circuit resistance of three-phase transformer It is anti-to be expressed as：
K3：Transformer primary side Y shape is connected, using voltage transformer, current transformer, measurable transformer primary avris voltageAnd electric currentThis primary side phase voltage, primary side phase electricity equivalent to the three-phase transformer of measurement Stream.Transformer secondary triangle is connected, for load-side, the voltage measured by applied voltage transformer, current transformerAnd electric currentThis amount is not the secondary phase voltage of transformer, and secondary phase current is both needed to Corresponding numerical value conversion can just obtain corresponding secondary a, b, c three-phase pressure and phase current values.
According to Kirchhoff's second law, secondary phase voltage can be obtained：
According to Kirchhoff's current law (KCL), secondary current relational expression can be obtained:
According to Kirchhoff's current law (KCL), primary current relational expression can be obtained：
Again according to the relation between transformer primary, secondary current, there is following relational expression：
According to three above current expression, can be calculated, three-phase transformer secondary phase current is：
I.e.
For single-phase two-winding transformer, its short-circuit impedance computing formula is：
Wherein, ZkThe short-circuit impedance (low-pressure side conversion to the total short-circuit impedance in high-pressure side) of single-phase transformer is represented,The electric current of former secondary is represented,Former secondary voltage is represented, n is transformer voltage ratio.
Short-circuit impedance calculating formula according to single-phase transformer, and be calculated Y-D connection three-phase transformer primary side, The phase voltage of secondary, phase current expression formula, can obtain the short-circuit impedance expression formula of three-phase transformer.
Other unaccounted parts belong to prior art.

Claims (1)

1. the three-phase transformer winding deformation on-line monitoring method of short circuit impedance method is based on, it is characterised in that：It includes following step Suddenly,
Step 1：A first voltage transformer and one are respectively mounted on the three-line of the input of three-phase transformer One current transformer, is respectively mounted a second voltage transformer and one on the three-line of three-phase transformer output end Two current transformers；
Step 2：The electricity that magnitude of voltage that three first voltage transformers are detected, three the first current transformers are detected The magnitude of voltage and three the second current transformers that flow valuve, three second voltage transformers are detected detect current value and pass to Data acquisition processing system；
Step 3：Data acquisition processing system is according to the magnitude of voltage for gathering, short-circuit reactance meter in current value, and three-phase transformer Formula calculates the short-circuit reactance of three-phase transformer, the real-time short-circuit reactance and standard of the three-phase line that staff will calculate Short-circuit reactance be compared so that judge Transformer Winding with the presence or absence of deformation；
Wherein, short-circuit reactance calculating formula is in three-phase transformer：
Z A = 1 2 · [ 1 K C T 1 I · A 0 + n K C T 2 ( I · a 0 - I · c 0 ) / 3 + n · K C T 1 ( I · A 0 + I · B 0 + I · C 0 ) / 3 ] × [ K P T 1 U · A 0 - n · K P T 2 ( U · a 0 - U · c 0 ) ] Z B = 1 2 · [ 1 K C T 1 I · B 0 + n K C T 2 ( I · b 0 - I · a 0 ) / 3 + n · K C T 1 ( I · A 0 + I · B 0 + I · C 0 ) / 3 ] × [ K P T 1 U · B 0 - n · K P T 2 ( U · b 0 - U · a 0 ) ] Z C = 1 2 · [ 1 K C T 1 I · C 0 + n K C T 2 ( I · c 0 - I · b 0 ) / 3 + n · K C T 1 ( I · A 0 + I · B 0 + I · C 0 ) / 3 ] × [ K P T 1 U · C 0 - n · K P T 2 ( U · c 0 - U · b 0 ) ]
Three first voltage transformers are respectively in the input voltage that the input of transformer is detectedWithThree first current transformers are respectively in the input current that the input of transformer is detectedWith
Three second voltage transformers are respectively in the input voltage that the output end of transformer is detectedWithThree second current transformers are respectively in the output current that the output end of transformer is detectedWith
The no-load voltage ratio of three first voltage transformers is KPT1, the no-load voltage ratio of three first current transformers is KCT1, it is described Three no-load voltage ratios of second voltage transformer are KPT2, the no-load voltage ratio of three second current transformers is KCT2。
CN201611068330.XA 2016-11-29 2016-11-29 Three-phase transformer winding deformation on-line monitoring method based on short circuit impedance method Expired - Fee Related CN106767375B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111722152A (en) * 2020-06-29 2020-09-29 龚小娟 Transformer winding deformation monitoring method and monitoring system

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1441257A (en) * 2003-03-27 2003-09-10 河海大学 In-situ fault diagnosing technology for turn-to-turn short-circuit of transformer windings based on change in loss
CN201007733Y (en) * 2007-02-15 2008-01-16 西安天城电力仪器设备有限责任公司 Transformer winding deformation detection determining device
CN101261297A (en) * 2008-04-17 2008-09-10 沈阳工业大学 Electric power transformer windings parameter on-line real-time identification device and method
CN202041592U (en) * 2011-01-17 2011-11-16 国网电力科学研究院 Special vehicle-mounted test system for measuring key parameters of large-sized transformer
CN202093096U (en) * 2011-06-09 2011-12-28 上海市电力公司 Low-voltage short-circuit impedance test device of transformer
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
CN104181429A (en) * 2014-08-29 2014-12-03 国家电网公司 On-line loss measurement system for three-winding transformer
CN102997838B (en) * 2012-11-20 2015-04-15 中国电力科学研究院 Transformer winding deformation fault diagnosis method based on frequency sweep short circuit characteristics
CN105937876A (en) * 2016-07-14 2016-09-14 国网北京市电力公司 Transformer winding deformation detection system and method

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1441257A (en) * 2003-03-27 2003-09-10 河海大学 In-situ fault diagnosing technology for turn-to-turn short-circuit of transformer windings based on change in loss
CN201007733Y (en) * 2007-02-15 2008-01-16 西安天城电力仪器设备有限责任公司 Transformer winding deformation detection determining device
CN101261297A (en) * 2008-04-17 2008-09-10 沈阳工业大学 Electric power transformer windings parameter on-line real-time identification device and method
CN202041592U (en) * 2011-01-17 2011-11-16 国网电力科学研究院 Special vehicle-mounted test system for measuring key parameters of large-sized transformer
CN202093096U (en) * 2011-06-09 2011-12-28 上海市电力公司 Low-voltage short-circuit impedance test device of transformer
CN102997838B (en) * 2012-11-20 2015-04-15 中国电力科学研究院 Transformer winding deformation fault diagnosis method based on frequency sweep short circuit characteristics
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
CN104181429A (en) * 2014-08-29 2014-12-03 国家电网公司 On-line loss measurement system for three-winding transformer
CN105937876A (en) * 2016-07-14 2016-09-14 国网北京市电力公司 Transformer winding deformation detection system and method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
何文林等: "短路阻抗法变压器绕组变形测试技术探讨", 《浙江电力》 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111722152A (en) * 2020-06-29 2020-09-29 龚小娟 Transformer winding deformation monitoring method and monitoring system
CN111722152B (en) * 2020-06-29 2023-04-28 成都工百利自动化设备有限公司 Transformer winding deformation monitoring method and monitoring system

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