CN107300684A - A kind of check method in transformer differential protection secondary loop - Google Patents
A kind of check method in transformer differential protection secondary loop Download PDFInfo
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- CN107300684A CN107300684A CN201710709568.4A CN201710709568A CN107300684A CN 107300684 A CN107300684 A CN 107300684A CN 201710709568 A CN201710709568 A CN 201710709568A CN 107300684 A CN107300684 A CN 107300684A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
A kind of check method in transformer differential protection secondary loop, belongs to power system differential protection field.The check method by way of in step down side, three-phase high-current generator is set, solve it is existing because the load current of transformer to be protected is too small cause the loading tests of transformer differential protection secondary wiring of current mutual inductor not carry out the problem of.The check method judges whether the parameter setting of differential protection is correct by way of the induced-current of the secondary winding for the current transformer for gathering differential protection is compared with its theoretical value.Whether the check method is 0 is whether correct according to the wiring to judge differential protection secondary loop with spill current.The check method using the induced-current of the secondary winding of homonymy threephase current transformer whether be positive phase sequence as according to whether correct come the polarity of the current transformer that judges differential protection secondary loop.The method of the invention is applied to check transformer differential protection secondary loop.
Description
Technical field
The present invention relates to a kind of check method in differential protection secondary loop, belong to power system differential protection field.
Background technology
Transformer differential protection as transformer main protection, for the reaction sensitivity that is broken down in protection zone very
It is high.However, often due to secondary wiring of current mutual inductor is incorrect, causing transformer differential protection performance factor relatively low.
In real work, in order to judge whether transformer differential protection secondary wiring of current mutual inductor is correct, not only need to carry out it
Theory analysis, and need to carry out loading tests to it.
The loading tests method of existing transformer differential protection secondary wiring of current mutual inductor is：Adjustment system is once
The method of operation, the equipment that makes to put into operation is serially connected with load current, and the test electric current more than 20mA is produced in secondary circuit, to carry out
The measurement of on-load.In theory, load current is the bigger the better, and load current is bigger, and embodiment of the various mistakes in spill current is just
It is more obvious, more easily determine.Test load should meet used test accuracy of instrument requirement, and can guarantee that spill current and load
The comparativity of electric current.But the transformer of actual motion, load current limited by power system operating mode, it is impossible to unrestricted regulation,
It is usually too small because of specific electric load is gone out in real work, it need to repeatedly adjust the method for operation and transfer load to meet test request.Especially
It is developing rapidly with area power grid, the often also no load of low-voltage side outlet, or even part when many new transformer stations put into operation
Transformer station does not have capacitor, causes loading tests not implement.
The content of the invention
The present invention causes transformer differential protection electric current mutual for solution because the load current of transformer to be protected is too small
A kind of the problem of loading tests of sensor secondary connection can not be carried out, it is proposed that check in transformer differential protection secondary loop
Method.
The check method in transformer differential protection secondary loop of the present invention is realized based on three-phase high-current generator；
When the output current of three-phase high-current generator meets the measurement accuracy of differential protection, the check method
Including：
S1, before transformer to be protected is gone into operation, its differential protection secondary loop is connected, and by high voltage side of transformer three
Phase short circuit grounding；
S2, three-phase current applied to the low-pressure side of transformer using three-phase high-current generator；
First winding, transformation of the A phases output current of three-phase high-current generator successively through low-pressure side A phase current mutual inductors
The first winding of device and high-pressure side A phase current mutual inductors, flows into the earth；
First winding, transformation of the B phases output current of three-phase high-current generator successively through low-pressure side B phase current mutual inductors
The first winding of device and high-pressure side B phase current mutual inductors, flows into the earth；
First winding, transformation of the C phases output current of three-phase high-current generator successively through low-pressure side C phase current mutual inductors
The first winding of device and high-pressure side C phase current mutual inductors, flows into the earth；
S3, obtained by A phases differential protection high and low pressure side A phase current mutual inductors secondary winding induced-current,
The induced-current of the secondary winding of high and low pressure side B phase current mutual inductors is obtained by B phases differential protection, it is differential by C phases
Protection device obtains the induced-current of the secondary winding of high and low pressure side C phase current mutual inductors；
For the induced-current of the secondary winding of each current transformer, when it is not equal to its theoretical value, the electricity is adjusted
The parameter of the corresponding differential protection of current transformer, makes it equal to its theoretical value；
Otherwise, S4 is performed；
S4, for every phase differential protection, when the spill current of its acquisition is not 0, change the differential protection secondary
The mode of connection in loop, it is 0 to make the spill current；Otherwise, S5 is performed；
S5, obtained using pincerlike phase meter high and low pressure side A phase current mutual inductors secondary winding faradic phase
Position, the faradic phase of the secondary winding of high and low pressure side B phase current mutual inductors and high and low pressure side C phase current mutual inductors
The faradic phase of secondary winding；
Faradic phase, high-pressure side B phase current mutual inductors for the secondary winding of high-pressure side A phase current mutual inductors
Secondary winding faradic phase and high-pressure side C phase current mutual inductors secondary winding faradic phase, when
When three is not positive phase sequence, the polarity in the differential protection secondary loop is changed, until three is positive phase sequence；
Faradic phase, low-pressure side B phase current mutual inductors for the secondary winding of low-pressure side A phase current mutual inductors
Secondary winding faradic phase and low-pressure side C phase current mutual inductors secondary winding faradic phase, when
When three is not positive phase sequence, the polarity in the differential protection secondary loop is changed, until three is positive phase sequence；
When the output current of three-phase high-current generator is unsatisfactory for the measurement accuracy of differential protection, the check side
Method includes：
S6, before transformer to be protected is gone into operation, be grounded by transformer short circuit, and by high voltage side of transformer three-phase shortcircuit；
S7, three-phase current applied to the low-pressure side of transformer using three-phase high-current generator；
First winding and height of the A phases output current of three-phase high-current generator successively through low-pressure side A phase current mutual inductors
The first winding of side A phase current mutual inductors is pressed, the earth is flowed into；
First winding and height of the B phases output current of three-phase high-current generator successively through low-pressure side B phase current mutual inductors
The first winding of side B phase current mutual inductors is pressed, the earth is flowed into；
First winding and height of the C phases output current of three-phase high-current generator successively through low-pressure side C phase current mutual inductors
The first winding of side C phase current mutual inductors is pressed, the earth is flowed into；
S8, obtained by A phases differential protection high and low pressure side A phase current mutual inductors secondary winding induced-current,
The induced-current of the secondary winding of high and low pressure side B phase current mutual inductors is obtained by B phases differential protection, it is differential by C phases
Protection device obtains the induced-current of the secondary winding of high and low pressure side C phase current mutual inductors；
A phases differential protection, B phases differential protection and C phases differential protection need to use YY wiring；
For the induced-current of the secondary winding of each current transformer, when it is not equal to its theoretical value, the electricity is adjusted
The parameter of the corresponding differential protection of current transformer, makes it equal to its theoretical value；
Otherwise, S9 is performed；
S9, for every phase differential protection, when the spill current of its acquisition is not 0, change the differential protection secondary
The mode of connection in loop, it is 0 to make the spill current；Otherwise, S10 is performed；
S10, obtained using pincerlike phase meter high and low pressure side A phase current mutual inductors secondary winding faradic phase
Position, the faradic phase of the secondary winding of high and low pressure side B phase current mutual inductors and high and low pressure side C phase current mutual inductors
The faradic phase of secondary winding；
Faradic phase, high-pressure side B phase current mutual inductors for the secondary winding of high-pressure side A phase current mutual inductors
Secondary winding faradic phase and high-pressure side C phase current mutual inductors secondary winding faradic phase, when
When three is not positive phase sequence, the polarity in the differential protection secondary loop is changed, until three is positive phase sequence；
Faradic phase, low-pressure side B phase current mutual inductors for the secondary winding of low-pressure side A phase current mutual inductors
Secondary winding faradic phase and low-pressure side C phase current mutual inductors secondary winding faradic phase, when
When three is not positive phase sequence, the polarity in the differential protection secondary loop is changed, until three is positive phase sequence.
As preferably, the mode by transformer short circuit is：Step down side three-phase sleeve pipe is disconnected, and using short
Route is by transformer short circuit.
The check method in transformer differential protection secondary loop of the present invention, by the low of transformer to be protected
Press side that three-phase high-current generator is set, solve existing causes transformation because the load current of transformer to be protected is too small
The problem of loading tests of device differential protection secondary wiring of current mutual inductor can not be carried out.Using transformer of the present invention
The check method in differential protection secondary loop, can detect whether the parameter setting of differential protection is correct, in secondary circuit
Whether the polarity of current transformer is correct, and then realizes the check to transformer differential protection secondary loop.
Brief description of the drawings
Hereinafter will be based on embodiment and refer to the attached drawing come to transformer differential protection secondary loop of the present invention
Check method be described in more detail, wherein：
Fig. 1 be when the output current of three-phase high-current generator meets the measurement accuracy of differential protection, it is to be protected
Transformer electrical connection schematic diagram, wherein, 1 is three-phase high-current generator, and 2 be low-pressure side A phase current mutual inductors, and 3 are
Low-pressure side B phase current mutual inductors, 4 be low-pressure side C phase current mutual inductors, and 5 be transformer to be protected, and 6 be high-pressure side A phase currents
Transformer, 7 be high-pressure side B phase current mutual inductors, and 8 be high-pressure side C phase current mutual inductors.
Embodiment
Below in conjunction with accompanying drawing to the check method in transformer differential protection secondary loop of the present invention furtherly
It is bright.
Embodiment：The present embodiment is explained with reference to Fig. 1.
It is real that the check method in the transformer differential protection secondary loop described in the present embodiment is based on three-phase high-current generator
It is existing；
When the output current of three-phase high-current generator meets the measurement accuracy of differential protection, the check method
Including：
S1, before transformer to be protected is gone into operation, its differential protection secondary loop is connected, and by high voltage side of transformer three
Phase short circuit grounding；
S2, three-phase current applied to the low-pressure side of transformer using three-phase high-current generator；
First winding, transformation of the A phases output current of three-phase high-current generator successively through low-pressure side A phase current mutual inductors
The first winding of device and high-pressure side A phase current mutual inductors, flows into the earth；
First winding, transformation of the B phases output current of three-phase high-current generator successively through low-pressure side B phase current mutual inductors
The first winding of device and high-pressure side B phase current mutual inductors, flows into the earth；
First winding, transformation of the C phases output current of three-phase high-current generator successively through low-pressure side C phase current mutual inductors
The first winding of device and high-pressure side C phase current mutual inductors, flows into the earth；
S3, obtained by A phases differential protection high and low pressure side A phase current mutual inductors secondary winding induced-current,
The induced-current of the secondary winding of high and low pressure side B phase current mutual inductors is obtained by B phases differential protection, it is differential by C phases
Protection device obtains the induced-current of the secondary winding of high and low pressure side C phase current mutual inductors；
For the induced-current of the secondary winding of each current transformer, when it is not equal to its theoretical value, the electricity is adjusted
The parameter of the corresponding differential protection of current transformer, makes it equal to its theoretical value；
Otherwise, S4 is performed；
S4, for every phase differential protection, when the spill current of its acquisition is not 0, change the differential protection secondary
The mode of connection in loop, it is 0 to make the spill current；Otherwise, S5 is performed；
S5, obtained using pincerlike phase meter high and low pressure side A phase current mutual inductors secondary winding faradic phase
Position, the faradic phase of the secondary winding of high and low pressure side B phase current mutual inductors and high and low pressure side C phase current mutual inductors
The faradic phase of secondary winding；
Faradic phase, high-pressure side B phase current mutual inductors for the secondary winding of high-pressure side A phase current mutual inductors
Secondary winding faradic phase and high-pressure side C phase current mutual inductors secondary winding faradic phase, when
When three is not positive phase sequence, the polarity in the differential protection secondary loop is changed, until three is positive phase sequence；
Faradic phase, low-pressure side B phase current mutual inductors for the secondary winding of low-pressure side A phase current mutual inductors
Secondary winding faradic phase and low-pressure side C phase current mutual inductors secondary winding faradic phase, when
When three is not positive phase sequence, the polarity in the differential protection secondary loop is changed, until three is positive phase sequence；
When the output current of three-phase high-current generator is unsatisfactory for the measurement accuracy of differential protection, the check side
Method includes：
S6, before transformer to be protected is gone into operation, be grounded by transformer short circuit, and by high voltage side of transformer three-phase shortcircuit；
S7, three-phase current applied to the low-pressure side of transformer using three-phase high-current generator；
First winding and height of the A phases output current of three-phase high-current generator successively through low-pressure side A phase current mutual inductors
The first winding of side A phase current mutual inductors is pressed, the earth is flowed into；
First winding and height of the B phases output current of three-phase high-current generator successively through low-pressure side B phase current mutual inductors
The first winding of side B phase current mutual inductors is pressed, the earth is flowed into；
First winding and height of the C phases output current of three-phase high-current generator successively through low-pressure side C phase current mutual inductors
The first winding of side C phase current mutual inductors is pressed, the earth is flowed into；
S8, obtained by A phases differential protection high and low pressure side A phase current mutual inductors secondary winding induced-current,
The induced-current of the secondary winding of high and low pressure side B phase current mutual inductors is obtained by B phases differential protection, it is differential by C phases
Protection device obtains the induced-current of the secondary winding of high and low pressure side C phase current mutual inductors；
A phases differential protection, B phases differential protection and C phases differential protection need to use YY wiring；
For the induced-current of the secondary winding of each current transformer, when it is not equal to its theoretical value, the electricity is adjusted
The parameter of the corresponding differential protection of current transformer, makes it equal to its theoretical value；
Otherwise, S9 is performed；
S9, for every phase differential protection, when the spill current of its acquisition is not 0, change the differential protection secondary
The mode of connection in loop, it is 0 to make the spill current；Otherwise, S10 is performed；
S10, obtained using pincerlike phase meter high and low pressure side A phase current mutual inductors secondary winding faradic phase
Position, the faradic phase of the secondary winding of high and low pressure side B phase current mutual inductors and high and low pressure side C phase current mutual inductors
The faradic phase of secondary winding；
Faradic phase, high-pressure side B phase current mutual inductors for the secondary winding of high-pressure side A phase current mutual inductors
Secondary winding faradic phase and high-pressure side C phase current mutual inductors secondary winding faradic phase, when
When three is not positive phase sequence, the polarity in the differential protection secondary loop is changed, until three is positive phase sequence；
Faradic phase, low-pressure side B phase current mutual inductors for the secondary winding of low-pressure side A phase current mutual inductors
Secondary winding faradic phase and low-pressure side C phase current mutual inductors secondary winding faradic phase, when
When three is not positive phase sequence, the polarity in the differential protection secondary loop is changed, until three is positive phase sequence.
Mode by transformer short circuit is：Step down side three-phase sleeve pipe is disconnected, and uses short-circuit line by transformer
Short circuit.
The check method in the transformer differential protection secondary loop described in the present embodiment, because the transformer do not gone into operation is not taken out of
Specific electric load is without influenceing supplying power for outside.
Using the check method in the transformer differential protection secondary loop described in the present embodiment, it can be effectively prevented from because becoming
Depressor differential protection secondary circuit connection mistake and cause differential protection malfunction.
The check method in the transformer differential protection secondary loop described in the present embodiment is applied also for high and low pressure bus
Checked in differential protection secondary loop.
Although describing the present invention herein with reference to specific embodiment, it should be understood that, these realities
Apply the example that example is only principles and applications.It should therefore be understood that can be permitted exemplary embodiment
Many modifications, and can be designed that other arrangements, the spirit of the invention limited without departing from appended claims and
Scope.It should be understood that can be by way of different from described by original claim come with reference to different appurtenances
It is required that and feature specifically described herein.It will also be appreciated that the feature with reference to described by separate embodiments can be used at it
In his embodiment.
Claims (2)
1. a kind of check method in transformer differential protection secondary loop, it is characterised in that it is big that the check method is based on three-phase
Current feedback circuit is realized；
When the output current of three-phase high-current generator meets the measurement accuracy of differential protection, the check method bag
Include：
S1, before transformer to be protected is gone into operation, its differential protection secondary loop is connected, and high voltage side of transformer three-phase is short
Road is grounded；
S2, three-phase current applied to the low-pressure side of transformer using three-phase high-current generator；
First winding of the A phases output current of three-phase high-current generator successively through low-pressure side A phase current mutual inductors, transformer and
The first winding of high-pressure side A phase current mutual inductors, flows into the earth；
First winding of the B phases output current of three-phase high-current generator successively through low-pressure side B phase current mutual inductors, transformer and
The first winding of high-pressure side B phase current mutual inductors, flows into the earth；
First winding of the C phases output current of three-phase high-current generator successively through low-pressure side C phase current mutual inductors, transformer and
The first winding of high-pressure side C phase current mutual inductors, flows into the earth；
S3, obtained by A phases differential protection high and low pressure side A phase current mutual inductors secondary winding induced-current, pass through
B phases differential protection obtains the induced-current of the secondary winding of high and low pressure side B phase current mutual inductors, passes through C phase differential protections
Device obtains the induced-current of the secondary winding of high and low pressure side C phase current mutual inductors；
For the induced-current of the secondary winding of each current transformer, when it is not equal to its theoretical value, the electric current is adjusted mutual
The parameter of the corresponding differential protection of sensor, makes it equal to its theoretical value；
Otherwise, S4 is performed；
S4, for every phase differential protection, when the spill current of its acquisition is not 0, change the differential protection secondary loop
The mode of connection, make the spill current be 0；Otherwise, S5 is performed；
S5, the faradic phase of secondary winding for obtaining using pincerlike phase meter high and low pressure side A phase current mutual inductors, height,
The faradic phase of the secondary winding of low-pressure side B phase current mutual inductors and the secondary of high and low pressure side C phase current mutual inductors around
The faradic phase of group；
Faradic phase for the secondary winding of high-pressure side A phase current mutual inductors, the two of high-pressure side B phase current mutual inductors
The faradic phase of the faradic phase of secondary winding and the secondary winding of high-pressure side C phase current mutual inductors, works as three
When being not positive phase sequence, the polarity in the differential protection secondary loop is changed, until three is positive phase sequence；
Faradic phase for the secondary winding of low-pressure side A phase current mutual inductors, the two of low-pressure side B phase current mutual inductors
The faradic phase of the faradic phase of secondary winding and the secondary winding of low-pressure side C phase current mutual inductors, works as three
When being not positive phase sequence, the polarity in the differential protection secondary loop is changed, until three is positive phase sequence；
When the output current of three-phase high-current generator is unsatisfactory for the measurement accuracy of differential protection, the check method bag
Include：
S6, before transformer to be protected is gone into operation, be grounded by transformer short circuit, and by high voltage side of transformer three-phase shortcircuit；
S7, three-phase current applied to the low-pressure side of transformer using three-phase high-current generator；
First winding and high-pressure side A of the A phases output current of three-phase high-current generator successively through low-pressure side A phase current mutual inductors
The first winding of phase current mutual inductor, flows into the earth；
First winding and high-pressure side B of the B phases output current of three-phase high-current generator successively through low-pressure side B phase current mutual inductors
The first winding of phase current mutual inductor, flows into the earth；
First winding and high-pressure side C of the C phases output current of three-phase high-current generator successively through low-pressure side C phase current mutual inductors
The first winding of phase current mutual inductor, flows into the earth；
S8, obtained by A phases differential protection high and low pressure side A phase current mutual inductors secondary winding induced-current, pass through
B phases differential protection obtains the induced-current of the secondary winding of high and low pressure side B phase current mutual inductors, passes through C phase differential protections
Device obtains the induced-current of the secondary winding of high and low pressure side C phase current mutual inductors；
A phases differential protection, B phases differential protection and C phases differential protection need to use YY wiring；
For the induced-current of the secondary winding of each current transformer, when it is not equal to its theoretical value, the electric current is adjusted mutual
The parameter of the corresponding differential protection of sensor, makes it equal to its theoretical value；
Otherwise, S9 is performed；
S9, for every phase differential protection, when the spill current of its acquisition is not 0, change the differential protection secondary loop
The mode of connection, make the spill current be 0；Otherwise, S10 is performed；
S10, obtained using pincerlike phase meter high and low pressure side A phase current mutual inductors secondary winding faradic phase,
The faradic phase of the secondary winding of high and low pressure side B phase current mutual inductors and the two of high and low pressure side C phase current mutual inductors
The faradic phase of secondary winding；
Faradic phase for the secondary winding of high-pressure side A phase current mutual inductors, the two of high-pressure side B phase current mutual inductors
The faradic phase of the faradic phase of secondary winding and the secondary winding of high-pressure side C phase current mutual inductors, works as three
When being not positive phase sequence, the polarity in the differential protection secondary loop is changed, until three is positive phase sequence；
Faradic phase for the secondary winding of low-pressure side A phase current mutual inductors, the two of low-pressure side B phase current mutual inductors
The faradic phase of the faradic phase of secondary winding and the secondary winding of low-pressure side C phase current mutual inductors, works as three
When being not positive phase sequence, the polarity in the differential protection secondary loop is changed, until three is positive phase sequence.
2. the check method in transformer differential protection secondary loop as claimed in claim 2, it is characterised in that transformer is short
The mode connect is：Step down side three-phase sleeve pipe is disconnected, and uses short-circuit line by transformer short circuit.
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| CN201710709568.4A CN107300684B (en) | 2017-08-17 | 2017-08-17 | A kind of check method in transformer differential protection secondary circuit |
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| CN201710709568.4A CN107300684B (en) | 2017-08-17 | 2017-08-17 | A kind of check method in transformer differential protection secondary circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109038493A (en) * | 2018-09-04 | 2018-12-18 | 国网黑龙江省电力有限公司哈尔滨供电公司 | A kind of adjustment method of main transformer ratio-restrained characteristic differential protection |
| CN112083372A (en) * | 2020-08-21 | 2020-12-15 | 深圳供电局有限公司 | Current transformer polarity identification method and system |
| CN112379194A (en) * | 2020-10-29 | 2021-02-19 | 云南电网有限责任公司 | Secondary loop detection method for transformer protection device |
| CN112904106A (en) * | 2021-01-15 | 2021-06-04 | 国网山东省电力公司菏泽供电公司 | Multipoint synchronous pilot differential protection direction test system and method |
| CN115291009A (en) * | 2022-07-25 | 2022-11-04 | 国能南京电力试验研究有限公司 | Test method for judging secondary winding group of current transformer in power system operation |
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| CN112083372B (en) * | 2020-08-21 | 2023-12-15 | 深圳供电局有限公司 | Polarity identification method and system for current transformer |
| CN112379194A (en) * | 2020-10-29 | 2021-02-19 | 云南电网有限责任公司 | Secondary loop detection method for transformer protection device |
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| CN112904106A (en) * | 2021-01-15 | 2021-06-04 | 国网山东省电力公司菏泽供电公司 | Multipoint synchronous pilot differential protection direction test system and method |
| CN115291009A (en) * | 2022-07-25 | 2022-11-04 | 国能南京电力试验研究有限公司 | Test method for judging secondary winding group of current transformer in power system operation |
| CN115291009B (en) * | 2022-07-25 | 2024-07-19 | 国能南京电力试验研究有限公司 | Test method for judging secondary winding group of current transformer in operation of power system |
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