CN106767375B - 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 PDFInfo
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- CN106767375B CN106767375B CN201611068330.XA CN201611068330A CN106767375B CN 106767375 B CN106767375 B CN 106767375B CN 201611068330 A CN201611068330 A CN 201611068330A CN 106767375 B CN106767375 B CN 106767375B
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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
Abstract
The invention discloses a kind of three-phase transformer winding deformation on-line monitoring method based on short circuit impedance method, is related to a kind of method for being monitored on-line to three-phase transformer winding deformation.It includes that 6 voltage transformers, 6 current transformers and a Digital Signal Analysis and Processing system are installed on three-phase transformer, the voltage value that Digital Signal Analysis and Processing system is detected according to 6 voltage transformers, the current value that 6 current transformers detect, 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 calculated three-phase line is compared by staff with the short-circuit reactance of standard, to judge transformer winding with the presence or absence of deformation.It is convenient that the present invention realizes, cost is relatively low, can be realized the on-line checking of the short-circuit reactance parameter of transformer, can judge three-phase transformer winding deformation situation in real time.
Description
Technical field
The present invention relates to a kind of method for being monitored on-line to three-phase transformer winding deformation, specifically one
Three-phase transformer winding deformation on-line monitoring method of the kind based on short circuit impedance method.
Background technique
Power transformer is the important equipment in power grid, and the safe operation of electrical transformer is to the normal of guarantee electric 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 finding the accident potential of transformer in time, extend the service life of transformer and guarantee entire electric system
Safe and stable operation has a very important significance the research of deformation of transformer winding online test method.
Existing theoretical research show the short-circuit reactance value of transformer be by geometric dimension, spatial position of winding etc. because
Element is determined.When transformer winding deforms, short-circuit reactance value will change, therefore measure short-circuit reactance variation
Situation is a kind of effective ways for judging transformer winding and whether deforming.
Currently, there are two main classes for the deformation test of transformer winding method based on short circuit impedance method, one kind is to need to become
Depressor is disconnected from power grid, carries out no-load test and short-circuit test, this is offline；Another kind of on-line monitoring method, mathematics meter
It calculates model and is directed to single-phase double winding experimental transformer.Therefore, these two kinds of methods are all not applicable to actual motion in power grid
The on-line monitoring of power transformer progress short-circuit impedance.
Summary of the invention
The purpose of the invention is to overcome the shortcoming of background technique, and provide a kind of three based on short circuit impedance method
Phase transformer winding deformation on-line monitoring method.
To achieve the goals above, the technical solution of the present invention is as follows: the three-phase transformer winding based on short circuit impedance method becomes
Shape on-line monitoring method, it is characterised in that: it includes the following steps,
Step 1: a first voltage mutual inductor and one are installed respectively on the three-line of three-phase transformer input terminal
First current transformer installs a second voltage mutual inductor and one respectively on the three-line of three-phase transformer output end
Second current transformer；
Step 2: voltage value that three first voltage mutual inductors detect, three the first current transformers are detected
Current value, the voltage value that detects of three second voltage mutual inductors and three the second current transformers detect that current value passes
Pass data acquisition processing system；
Step 3: data acquisition processing system is according to the voltage value of acquisition, short circuit electricity in current value and three-phase transformer
Anti- calculating formula calculates the short-circuit reactance of three-phase transformer, staff by the real-time short-circuit reactance of calculated three-phase line with
The short-circuit reactance of standard is compared, to judge transformer winding with the presence or absence of deformation；
Wherein, short-circuit reactance calculating formula in three-phase transformer are as follows:
Three first voltage mutual inductors are respectively in the input voltage that the input terminal of transformer detects
WithThree first current transformers are respectively in the input current that the input terminal of transformer detectsWith
Three second voltage mutual inductors are respectively in the input voltage that the output end of transformer detects
WithThree second current transformers are respectively in the output electric current that the output end of transformer detectsWith
The no-load voltage ratio of three first voltage mutual inductors is KPT1, the no-load voltage ratio of three first current transformers is KCT1,
The no-load voltage ratio of three second voltage mutual inductors is KPT2, the no-load voltage ratio of three second current transformers is KCT2。
The present invention is formed by the strict derivation of equation, by establishing a three-phase transformer winding circuit impedance parameter
Mathematics computing model has reliable theory support foundation, can be realized the on-line checking of the short-circuit reactance parameter of transformer, can
Three-phase transformer winding deformation situation is judged 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 signal in original circuit system
Analysis can monitor the transformer being currently running in electric system on-line with processing system (PC machine), and 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.
Detailed description of the invention
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 and do not constitute a limitation of the invention, only
It is for example.Keep advantages of the present invention more clear by explanation simultaneously and is readily appreciated that.
Refering to known to attached drawing: the three-phase transformer winding deformation on-line monitoring method based on short circuit impedance method, feature exist
In: it includes the following steps,
Step 1: a first voltage mutual inductor and one are installed respectively on the three-line of three-phase transformer input terminal
First current transformer installs a second voltage mutual inductor and one respectively on the three-line of three-phase transformer output end
Second current transformer；
Step 2: voltage value that three first voltage mutual inductors detect, three the first current transformers are detected
Current value, the voltage value that detects of three second voltage mutual inductors and three the second current transformers detect that current value passes
Pass data acquisition processing system；
Step 3: data acquisition processing system is according to the voltage value of acquisition, short circuit electricity in current value and three-phase transformer
Anti- calculating formula calculates the short-circuit reactance of three-phase transformer, staff by the real-time short-circuit reactance of calculated three-phase line with
The short-circuit reactance of standard is compared, to judge transformer winding with the presence or absence of deformation；
Wherein, short-circuit reactance calculating formula in three-phase transformer are as follows:
Three first voltage mutual inductors are respectively in the input voltage that the input terminal of transformer detects
WithThree first current transformers are respectively in the input current that the input terminal of transformer detectsWith
Three second voltage mutual inductors are respectively in the input voltage that the output end of transformer detects
WithThree second current transformers are respectively in the output electric current that the output end of transformer detectsWith
The no-load voltage ratio of three first voltage mutual inductors is KPT1, the no-load voltage ratio of three first current transformers is KCT1,
The no-load voltage ratio of three second voltage mutual inductors is KPT2, the no-load voltage ratio of three second current transformers is KCT2。
In actual work, the calculating formula of the short-circuit reactance of three-phase transformer is derived in the following way:
S1: as shown in Fig. 2,6 voltage transformers are respectively PT1~PT6, 6 current transformers are respectively CT1~
CT6, voltage transformer pt1~PT6The voltage detected is respectively Current transformer
CT1~CT6The electric current detected 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 pair of transformer
Side output voltageThe primary side input current of transformer is respectivelyWithSecondary side output electric current difference
For
Transformer actually enters voltage, output voltage, current value, there is following relationship with the value measured:
S3: in conjunction with 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 are as follows:
In actual 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 terminal electric current is respectivelyPrimary side neutral node electric current is usedIt indicates.Three-phase pair side output end voltage is respectively
Three-phase pair side load-side exports electric current (line current)Flow through the electric current (phase of each winding in three-phase pair side
Electric current) be respectively
K2:A phase primary side short-circuit impedance, resistance, reactance are respectively ZA1、RA1、XA1；The impedance of A phase secondary short circuit, resistance, reactance
Respectively ZA2、RA2、XA2.B phase primary side short-circuit impedance, resistance, reactance are respectively ZB1、RB1、XB1；The impedance of B phase secondary short circuit, electricity
Resistance, reactance are respectively ZB2、RB2、XB2.C phase primary side short-circuit impedance, resistance, reactance are respectively ZC1、RC1、XC1；The resistance of C phase secondary short circuit
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 respectively indicate are as follows:
K3: the connection of transformer primary side Y shape can measure transformer primary avris voltage using voltage transformer, current transformerAnd electric currentThis is equivalent to the primary side phase voltage of the three-phase transformer of measurement, primary side mutually electricity
Stream.The connection of transformer secondary triangle, for load-side, voltage measured by applied voltage mutual inductor, current transformerAnd electric currentThis amount is not the secondary side phase voltage of transformer, and secondary side phase current is both needed to
Corresponding numerical value conversion can just obtain corresponding secondary side a, b, c three-phase pressure and phase current values.
According to Kirchhoff's second law, secondary side 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 relationship between transformer primary, secondary current, there is following relational expression:
It according to three above current expression, can be calculated, three-phase transformer pair side phase current are as follows:
I.e.
For single-phase two-winding transformer, short-circuit impedance calculation formula are as follows:
Wherein, ZkIndicate the short-circuit impedance (low-pressure side converts the short-circuit impedance total to high-pressure side) of single-phase transformer,Indicate the electric current on former secondary side,Indicate former secondary voltage, n is transformer voltage ratio.
According to the short-circuit impedance calculating formula of single-phase transformer, and the Y-D connection that is calculated three-phase transformer primary side,
Phase voltage, the phase current expression formula on secondary side, can obtain the short-circuit impedance expression formula of three-phase transformer.
Other unaccounted parts belong to the prior art.
Claims (1)
1. the three-phase transformer winding deformation on-line monitoring method based on short circuit impedance method, it is characterised in that: it includes following step
Suddenly,
Step 1: a first voltage mutual inductor and one are installed respectively on the three-line of the input terminal of three-phase transformer
One current transformer installs a second voltage mutual inductor and one respectively on the three-line of three-phase transformer output end
Two current transformers；
Step 2: the electricity that voltage value that three first voltage mutual inductors detect, three the first current transformers are detected
The voltage value and three the second current transformers that flow valuve, three second voltage mutual inductors detect detect that current value passes to
Data acquisition processing system；
Step 3: data acquisition processing system is according to the voltage value of acquisition, short-circuit reactance meter in current value and three-phase transformer
Formula calculates the short-circuit reactance of three-phase transformer, and staff is by the real-time short-circuit reactance and standard of calculated three-phase line
Short-circuit reactance be compared, thus judge transformer winding with the presence or absence of deformation；
Wherein, short-circuit reactance calculating formula in three-phase transformer are as follows:
Three first voltage mutual inductors are respectively in the input voltage that the input terminal of transformer detectsWithThree first current transformers are respectively in the input current that the input terminal of transformer detectsWith
Three second voltage mutual inductors are respectively in the input voltage that the output end of transformer detectsWithThree second current transformers are respectively in the output electric current that the output end of transformer detectsWith
The no-load voltage ratio of three first voltage mutual inductors is KPT1, the no-load voltage ratio of three first current transformers is KCT1, described
The no-load voltage ratio of three second voltage mutual inductors is KPT2, the no-load voltage ratio of three second current transformers is KCT2。
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