CN107064689B - A kind of analogy method and system of transformer TA broken string - Google Patents
A kind of analogy method and system of transformer TA broken string Download PDFInfo
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- CN107064689B CN107064689B CN201710301775.6A CN201710301775A CN107064689B CN 107064689 B CN107064689 B CN 107064689B CN 201710301775 A CN201710301775 A CN 201710301775A CN 107064689 B CN107064689 B CN 107064689B
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000004088 simulation Methods 0.000 claims description 15
- 230000001681 protective effect Effects 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 6
- 238000009826 distribution Methods 0.000 description 5
- 230000003247 decreasing effect Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The present invention provides the analogy methods and system of a kind of transformer TA broken string; by the input and output of one phase of tester connection corresponding with the input and output of a certain phase of differential protection side; the input and output of another phase of tester and the three-phase of the other two-phase of differential protection side and the other side are connected in series by several conducting wires; the electric current for enabling the first phase of tester, the second phase output size equal; if differential protection is failure to actuate, it is judged as that the phase to be measured of transformer TA does not break；It enables the first phase current be reduced to zero, if differential protection is failure to actuate, is judged as the phase to be measured broken string of transformer TA.Test process is enormously simplified, experimentation cost is reduced without applying six phase currents method of the present invention it is only necessary to applying biphase current, reduces and calculates the time, improve test efficiency.
Description
Technical field
The invention belongs to transformer technology field, in particular to a kind of the analogy method and system of transformer TA broken string.
Background technique
Power transformer is an important electrical equipment, and the power circuit of different voltages grade will be by different types
Power transformer connects, and forms a powerful electric system, and big in the different power distribution networks in electric system
The distribution transformer of amount is even more to play an important role, it directly provides electric energy for power consumer, once distribution transformer goes out
Can existing failure will will affect production and the household electricity of power consumer, therefore accurately and rapidly differentiate distribution transformer failure,
Such as disconnection fault, and then disconnection fault is excluded, restoring distribution transformer operation as far as possible in the time as short as possible will significantly
Influence Electric Power Service in High quality.
In order to simulate broken string, conventional method is before simulation actual motion breaks, to add to few six phase currents, i.e.,
Two sides add three-phase current respectively wherein, these added electric currents must make poor stream zero；Then a wherein at least phase is disconnected again
Electric current allows protective device to judge to break.The criterion that TA breaks in transformer differential protection is general are as follows: poor before TA broken string occurs
Dynamic protection is inactive, i.e., poor stream is zero；The electric current of an at least phase suddenly becomes zero.Due to needing to export at least six phase currents
The tester of function, to the more demanding of tester, if tester only has three-phase current output function, this test is very
Difficulty is done, or cannot be done at all, and experimentation cost is high, test efficiency is low.
Summary of the invention
The purpose of the present invention is to provide a kind of analogy methods of transformer TA broken string, for solving in the prior art to change
The simulation test of depressor TA broken string at least needs to connect the problem that 6 phase currents cause test complicated；A kind of transformation is additionally provided simultaneously
The simulation system of device TA broken string.
To achieve the above object, the technical scheme is that
A kind of analogy method of transformer TA broken string, for differential protective device of transformer, terminal block includes the first side
Three-phase input, output terminal and second side three-phase input, output terminal, include the following steps:
1) tester the first phase current terminal is taken, first side of differential protection terminal block phase to be measured is separately connected
Input, output terminal, make the first phase current of tester flow through the phase to be measured with forward direction；
Take tester the second phase current terminal and several connecting wires, connect all first sides in addition to phase to be measured,
The terminal of second side makes that the second phase current of tester is taken to flow through the other two-phase in the first side of device with forward direction, to flow counterflow through device
Second side three-phase；
2) electric current for enabling the first phase of tester, the second phase output size equal；
3) then the first phase current is enabled to be reduced to zero.
Further, if differential protection is failure to actuate in step 2), it is judged as that the phase to be measured of transformer TA does not break；
If the differential protection in step 3) is failure to actuate, it is judged as the phase to be measured broken string of transformer TA.
Further, the amplitude of the output electric current of the first phase and the second phase of tester must not exceed reference side rated current
Setting multiple, when it is described output electric current be greater than setting multiple rated value after, differential protection still acts.
It further, need to be setting by each lateral balance coefficient adjusting of transformer before carrying out transformer TA broken string simulation
Value.
The present invention also provides the simulation systems for having given a kind of transformer TA broken string, including tester and transformer differential protection
Device, the terminal block of differential protective device of transformer include that the first side three-phase input, output terminal and second side three-phase are defeated
Enter, output terminal, with tester the first phase current terminal, is separately connected first side of differential protection terminal block phase to be measured
Input, output terminal, so that the first phase current of tester is flowed through the phase to be measured with forward direction；With the second phase current of tester end
Son and several connecting wires connect the terminal of all first sides in addition to phase to be measured, second side, make the second phase of tester
Electric current flows through the other two-phase in the first side of differential protection with forward direction, to flow counterflow through differential protection second side three-phase.
The beneficial effects of the present invention are:
The present invention provides the analogy method of transformer TA broken string, the analogy method of transformer TA broken string of the invention,
During entire test, it is only necessary to apply biphase current, without applying six phase currents, enormously simplify test process, drop
Low experimentation cost；Desirable wider range of the biphase current of tester reduces and calculates the time, improves test efficiency.
The simulation system of transformer TA broken string of the invention, by the input and output of one phase of tester and differential protection one
The corresponding connection of the input and output of a certain phase of side, the input and output of another phase of tester and differential protection side are in addition
The three-phase of two-phase and the other side is connected in series by several conducting wires, and simulation system of the invention need to only apply the two-phase electricity of tester
Stream, simplifies test process, reduces experimentation cost.
Detailed description of the invention
Fig. 1 is that simulation A phase of the invention breaks schematic diagram；
Fig. 2 is that simulation B phase of the invention breaks schematic diagram；
Fig. 3 is that simulation C phase of the invention breaks schematic diagram.
Specific embodiment
A specific embodiment of the invention is further described with reference to the accompanying drawing:
A kind of simulation system of transformer TA broken string of the invention, including tester and differential protection, differential protection
The terminal block of device includes that the first side (A1, B1, C1) three-phase input, output terminal and second side (A2, B2, C2) three-phase are defeated
Enter, output terminal, with tester the first phase current terminal, with the current input terminal A1 and current output terminal A1N of tester
For, it is separately connected input, the output terminal of the first side of differential protection terminal block phase to be measured, with the one of differential protection
The A phase of side inputs for A1 with A phase exports A1N, i.e., the current input terminal A1 of tester and the A phase of differential protection is defeated
Entering A1 makes the first phase current of tester flow through phase to be measured with forward direction；With tester the second phase current terminal, with the electric current of tester
For input terminal B1 and current output terminal B1N and several connecting wires, connection in addition to phase to be measured (A) all the
Side, second side terminal, including input terminal B1, output terminal B1N, input terminal C1, output terminal C1N, input terminal
A2, output terminal A2N, input terminal B2, output terminal B2N, input terminal C2, output terminal C2N make to take the second phase of tester
Electric current flows through the other two-phase in the first side of device with forward direction, to flow counterflow through device second side three-phase.
The purpose of the present invention is to provide a kind of analogy methods of transformer TA broken string, and this method comprises the following steps:
It one, is as shown in Figure 1 the wiring schematic diagram simulating A phase and breaking, specific process are as follows:
1, selection any differential protection two sides electric current is tested.
2, each lateral balance coefficient adjusting of transformer is 1.
3, it is exported using A, B two-phase of tester.
4, simulation A phase breaks: the A phase that the A phase current of differential protection side connects tester exports, i.e. the A of tester
Phase input terminal A1 meets the input terminal A1 of differential protection A phase, and the A phase output terminals A1N of tester connects differential protection dress
The output terminal A1N of A phase is set, at this point, the current direction of differential protection side A phase is A1 → A1N, electric current is forward stream
Out.The input terminal B1 of device side B phase current meets the B phase output terminal B1N of tester, the output end B1N of device side B phase current
The input terminal C1 of side C phase current is concatenated, while the output of the output end C1N of side C phase current concatenation other side A phase current
Hold A2N, the output end B2N of the input terminal A2 concatenation other side B phase current of other side A phase current, the input of other side B phase current
The output end C2N of B2 concatenation other side C phase current, the input terminal C2 of other side C phase current is held to connect the B phase output terminal of tester
Common end B1N, after the B phase of tester accesses differential protection, the current direction of the terminal of differential protection be B1 →
B1N, C1 → C1N, A2N → A2, B2N → B2, C2N → C2, so that the B phase current forward direction of tester flows through differential protection
Other two-phase (B1, C1) terminals of the side, and flow counterflow through three-phase (A2, B2, C2) terminal of the other side.
5, A, B two-phase output size of tester is equal, the identical electric current in direction, and device two sides electric current is made to keep balance,
Poor stream is zero, and differential protection is failure to actuate, and is judged as that transformer TA phase to be measured does not break.
6, it exports the A phase of tester and is decreased to zero, device reports A phase TA to break, and differential protection is failure to actuate.
7, the amplitude maximum of A, B two-phase output electric current of tester is no more than a multiple of reference side rated current,
After difference current is greater than the rated current of the multiple, differential protection will not be influenced, TA by " TA breakage lock device differential protection "
Differential protection still exports tripping when broken string.
It two, is as shown in Figure 2 the wiring schematic diagram simulating B phase and breaking, specific process are as follows:
1) the step 1- step 3 in above-mentioned steps is carried out first, and then the B phase current of differential protection side connects test
The A phase of instrument exports, i.e. the A phase input terminal A1 of tester connects the input terminal B1 of differential protection B phase, the A phase of tester
Output terminal A1N meets the output terminal B1N of differential protection B phase, at this point, the current direction of differential protection side B phase
For B1 → B1N, electric current is positive outflow.The input terminal A1 of device side A phase current connects the B phase output terminal B1 of tester, device
The output terminals A 1N of side A phase current concatenates the input terminal C1 of side C phase current, while the output end C1N of side C phase current
Concatenate the output terminals A 2N of other side A phase current, the output end of the input terminal A2 concatenation other side B phase current of other side A phase current
B2N, the output end C2N of the input terminal B2 concatenation other side C phase current of other side B phase current, the input terminal of other side C phase current
C2 meets the common end B1N of the B phase output terminal of tester, after the B phase of tester accesses differential protection, differential protection
The current direction of terminal is A1 → A1N, C1 → C1N, A2N → A2, B2N → B2, C2N → C2, so that the B phase current of tester is just
To other two-phase (the A1, C1) terminals for the side for flowing through differential protection, and flow counterflow through the other side three-phase (A2, B2,
C2) terminal.
2) equal, the identical electric current in direction by A, B two-phase output size of tester makes device two sides electric current keep flat
Weighing apparatus, poor stream is zero, and differential protection is failure to actuate.
3) it exports the A phase of tester and is decreased to zero, device reports A phase TA to break.
4) amplitude maximum of A, B two-phase output electric current of tester is no more than a multiple of reference side rated current,
After difference current is greater than the rated current of the multiple, differential protection will not be by the work of " TA breakage lock device differential protection " word processed
With differential protection still exports tripping when TA breaks.
It three, is as shown in Figure 3 the wiring schematic diagram simulating C phase and breaking, specific process are as follows:
(1) the step 1- step 3 in above-mentioned steps is carried out first, and then the C phase current of differential protection side connects survey
The A phase of examination instrument exports, i.e. the A phase input terminal A1 of tester meets the input terminal C1, the A of tester of differential protection C phase
Phase output terminals A1N meets the output terminal C1N of differential protection C phase, at this point, the electric current stream of differential protection side C phase
To for C1 → C1N, electric current is positive outflow.The input terminal A1 of device side A phase current meets the B phase output terminal B1N of tester, dress
The output terminals A 1N for setting side A phase current concatenates the input terminal B1 of side B phase current, while the output end of side B phase current
B1N concatenates the output terminals A 2N of other side A phase current, and the input terminal A2 of other side A phase current concatenates the defeated of other side B phase current
Outlet B2N, other side B phase current input terminal B2 concatenation other side C phase current output end C2N, other side C phase current it is defeated
Enter to hold C2 to meet the common end B1N of the B phase output terminal of tester.After the B phase of tester accesses differential protection, differential protection dress
The current direction for the terminal set is A1 → A1N, B1 → B1N, A2N → A2, B2N → B2, C2N → C2, so that the B phase electricity of tester
Stream forward direction flows through other two-phase (A1, B1) terminals of the side of differential protection, and flows counterflow through the three-phase of the other side
(A2, B2, C2) terminal.
(2) equal, the identical electric current in direction by A, B two-phase output size of tester makes device two sides electric current keep flat
Weighing apparatus, difference stream are that zero differential protection is failure to actuate.
(3) it exports the A phase of tester and is decreased to zero, device reports A phase TA to break.
(4) if the amplitude maximum of A, B two-phase output electric current of tester is no more than one times of reference side rated current
Number, after difference current is greater than the rated current of the multiple, differential protection will not be influenced by " TA breakage lock device differential protection ",
Differential protection still exports tripping when TA breaks.
It in above-described embodiment, calculates for convenience, is 1 by each lateral balance coefficient adjusting of transformer, as other embodiment party
Formula can also adjust as other values.
Specific embodiment is presented above, but the present invention is not limited to embodiment described above.The present invention
Basic ideas be above-mentioned basic scheme, for those of ordinary skill in the art, introduction according to the present invention is designed each
The model of kind deformation, formula, parameter do not need to spend creative work.The case where not departing from the principle and spirit of the invention
Under to embodiment carry out change, modification, replacement and modification still fall in protection scope of the present invention.
Claims (4)
1. a kind of analogy method of transformer TA broken string, for differential protective device of transformer, terminal block includes the first side three
Mutually input, output terminal and second side three-phase input, output terminal, which comprises the steps of:
1) tester the first phase current terminal is taken, the defeated of first side of differential protection terminal block phase to be measured is separately connected
Enter, output terminal, the first phase current of tester is made to flow through the phase to be measured with forward direction；
It takes tester the second phase current terminal and several connecting wires, connects all first sides in addition to phase to be measured, second
The terminal of side makes the second phase current of tester flow through the other two-phase in first side of differential protection with forward direction, with reverse flow
Cross differential protection second side three-phase；
2) electric current for enabling the first phase of tester, the second phase output size equal；
3) then the first phase current is enabled to be reduced to zero；
Before carrying out transformer TA broken string simulation, each lateral balance coefficient of transformer need to be adjusted as identical setting value.
2. the analogy method of transformer TA broken string according to claim 1, which is characterized in that if differential protection in step 2)
Device is failure to actuate, then is judged as that the phase to be measured of transformer TA does not break；If the differential protection in step 3) is failure to actuate, sentence
Break as the phase to be measured broken string of transformer TA.
3. the analogy method of transformer TA according to claim 1 broken string, which is characterized in that the first phase of tester and the
The amplitude of the output electric current of two-phase must not exceed the setting multiple of reference side rated current, when the output electric current is greater than setting times
After several rated values, differential protection is still acted.
4. a kind of simulation system of transformer TA broken string, including tester and differential protective device of transformer, transformer differential are protected
The terminal block of protection unit includes the first side three-phase input, output terminal and second side three-phase input, output terminal, feature
Be, with tester the first phase current terminal, be separately connected first side of differential protection terminal block phase to be measured input,
Output terminal makes the first phase current of tester flow through the phase to be measured with forward direction；With tester the second phase current terminal, Yi Jiruo
Dry connecting wire connects the terminal of all first sides in addition to phase to be measured, second side, makes the second phase current of tester with forward direction
The other two-phase in the first side of device is flowed through, to flow counterflow through device second side three-phase；Before carrying out transformer TA broken string simulation, need
Each lateral balance coefficient of transformer is adjusted as identical setting value.
Priority Applications (1)
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| CN201710301775.6A CN107064689B (en) | 2017-05-02 | 2017-05-02 | A kind of analogy method and system of transformer TA broken string |
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| CN201710301775.6A CN107064689B (en) | 2017-05-02 | 2017-05-02 | A kind of analogy method and system of transformer TA broken string |
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| CN107064689B true CN107064689B (en) | 2019-10-22 |
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| CN109725231A (en) * | 2019-01-31 | 2019-05-07 | 潮州市汇能电机有限公司 | A kind of AC exciter armature coil polarity detector |
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