CN107748311A - A kind of short-circuit ability to bear checking system of power transformer - Google Patents
A kind of short-circuit ability to bear checking system of power transformer Download PDFInfo
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- CN107748311A CN107748311A CN201710834037.8A CN201710834037A CN107748311A CN 107748311 A CN107748311 A CN 107748311A CN 201710834037 A CN201710834037 A CN 201710834037A CN 107748311 A CN107748311 A CN 107748311A
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/62—Testing of transformers
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- Engineering & Computer Science (AREA)
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- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a kind of short-circuit ability to bear of power transformer to verify system, the outlet side parallel connection three-phase shortcircuit analog circuit of power transformer to be measured, and three-phase shortcircuit analog circuit includes：The first disconnecting switch, first voltage transformer, first pair of breaker, the first current transformer and the first reactor connected from the first output end of power transformer to be measured, from the second disconnecting switch of the second output end series connection, second voltage transformer, second pair of breaker, the second current transformer and the second reactor of power transformer to be measured, the 3rd disconnecting switch, tertiary voltage transformer, the 3rd pair of breaker, the 3rd current transformer and the 3rd reactor connected from the 3rd output end of power transformer to be measured；The output end of first short-circuit analog circuit, the second short-circuit analog circuit and the 3rd short-circuit analog circuit is grounded, the present invention realizes the short-circuit ability to bear of on-site verification power transformer, do not delay normal power supply, also reduce transport, improve the accuracy of the result.
Description
Technical field
The present invention relates to the short-circuit ability to bear checking of power transformer testing field, more particularly to a kind of power transformer
System.
Background technology
Power transformer is one of equipment the most key in power system, is had highly importantly in power system
Position.In power system, power equipment is influenceed by various operating modes and failure, wherein short trouble be most serious failure it
One, therefore the short-circuit strength of power transformer is paid close attention to by the extreme of power industry and manufacturing, relevant department is also electric power
Transformer has worked out standard GB/T 1094.5 in terms of the ability of short circuit is born.Power transformer before formal come into operation according to
Correlation test is carried out according to above-mentioned standard, is able to verify that whether its design and manufacture level reach expected requirement.
The short-circuit ability to bear experiment of power transformer is generally completed with the great laboratory of capacity of short circuit, is simulation
The working condition of power transformer, it is that power transformer manufacturing enterprise and power consumer are difficult to when Power System Shortcuts.
But after the power transformer operation several years, its mechanical strength has declined, and certain potential safety hazard be present, because being limited by condition
System, can not verify whether its short-circuit ability to bear meets to require at the scene, therefore energy is born in the short circuit to power transformer at present
Power detection is limited.
The content of the invention
The embodiment of the present invention verifies system by providing a kind of short-circuit ability to bear of power transformer, solves to electric power
The technical problem that the short-circuit ability to bear detection of transformer is limited.
The embodiment of the present invention provide power transformer short-circuit ability to bear checking system, including three-phase shortcircuit simulation electricity
Road；
The outlet side for the power transformer to be measured being connected on the three phase network bus of the electric network source three-phase in parallel is short
Road analog circuit；
First short-circuit analog circuit of the three-phase shortcircuit analog circuit includes：From the output of the power transformer to be measured
The first disconnecting switch, first voltage transformer, first pair of breaker, the first current transformer and the first reactor of side series connection,
Second short-circuit analog circuit of the three-phase shortcircuit analog circuit includes what is connected from the outlet side of the power transformer to be measured
Second disconnecting switch, second voltage transformer, second pair of breaker, the second current transformer and the second reactor, the three-phase
The third phase short circuit analog circuit of short-circuit analog circuit include from the outlet side of the power transformer to be measured connect the 3rd every
Leave pass, tertiary voltage transformer, the 3rd pair of breaker, the 3rd current transformer and the 3rd reactor；Wherein, first electricity
The other end of the other end of anti-device, the other end of second reactor and the 3rd reactor is grounded.
Optionally, three-phase shortcircuit analog circuit is arrangement identical three-phase shortcircuit analog circuit.
Optionally, the output end of the three phase network bus is connected to the electricity to be measured by No. three input circuits of parallel connection
The input of power transformer；
The output end of the power transformer to be measured is connected to the three phase network mother by No. three output circuits of parallel connection
The input of line.
Optionally, the circuit arrangement of No. three input circuit is identical each other, the circuit arrangement of No. three output circuit
It is identical each other.
Optionally, the first output end in the output end of the three phase network bus by the 4th disconnecting switch of series connection,
4th voltage transformer, the 4th pair of breaker, the 4th current transformer are connected in the input of the power transformer to be measured
First input end；
The 5th disconnecting switch by series connection of the second output end in the output end of the three phase network bus, the 5th voltage
Transformer, the 5th pair of breaker, the 5th current transformer are connected in the input of the power transformer to be measured second defeated
Enter end；
The 6th disconnecting switch by series connection of the 3rd output end in the output end of the three phase network bus, the 6th voltage
Transformer, the 6th pair of breaker, the 6th current transformer are connected in the input of the power transformer to be measured 3rd defeated
Enter end.
Optionally, the 7th mutual induction of voltage that the first output end in the output end of the power transformer to be measured passes through series connection
Device, the 7th pair of breaker, the 7th disconnecting switch, the 7th current transformer, the 8th voltage transformer are connected to the three phase network
First input end in the input of bus input；
The second output end in the output end of the power transformer to be measured passes through the 9th voltage transformer of series connection, the 8th
The three phase network bus input is connected to breaker, the 8th disconnecting switch, the 8th current transformer, the tenth voltage transformer
The second input in the input at end；
The 3rd output end in the output end of the power transformer to be measured passes through the 11st voltage transformer of series connection,
Nine pairs of breakers, the 9th disconnecting switch, the 9th current transformer, the 12nd voltage transformer are connected to the three phase network bus
The 3rd input in the input of input.
Optionally, the input of the described first short-circuit analog circuit be connected to the 7th pair of breaker with the described 7th every
Leave between pass；
The input of the second short-circuit analog circuit is connected to the 8th pair of breaker and the 8th disconnecting switch
Between；
The input of the 3rd short-circuit analog circuit is connected to the 9th pair of breaker and the 9th disconnecting switch
Between.
Optionally, the power transformer to be measured is specifically two-winding transformer or three-winding transformer.
One or more technical schemes provided in an embodiment of the present invention, have at least the following technical effects or advantages：
By the outlet side parallel connection three-phase shortcircuit analog circuit of power transformer to be measured, transformer access power network electricity to be measured
Source, the outlet side of power transformer to be measured three phase short circuit fault analog circuit in parallel can simulate required short circuit duration, required
The single-phase short circuit of short circuit current size and DC component, line to line fault and three-phase shortcircuit, so as to using where power transformer
Electric network source is truer, easily simulates the working condition of the power transformer when Power System Shortcuts, realizes to be measured
The operation scene of power transformer is tested, and also more accurately verifies the anti-short circuit capability of transformer, and realizing is reducing examination
Test cost, need not to power transformer to be measured transport for long-distance, also without other high power laboratory power supply while, improve
The accuracy of the result, does not delay normal power supply, it is thus also avoided that cost of transportation；And then the present invention be it is a kind of easy, efficiently,
The scheme of the anti-short circuit capability of the checking power transformer inexpensive, easy to operate, accuracy is high.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
The embodiment of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing of offer obtains other accompanying drawings.
Fig. 1 is that the short-circuit ability to bear of power transformer provided in an embodiment of the present invention verifies the structural representation of system.
Fig. 2 is Fig. 1 refinement circuit diagram.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
Present embodiments provide a kind of short-circuit ability to bear checking system of power transformer.With reference to shown in figure 1 and Fig. 2,
The system includes three-phase shortcircuit analog circuit 1, the power transformer to be measured 2 being connected on the three phase network bus 3 of electric network source
Outlet side parallel connection three-phase shortcircuit analog circuit.
First short-circuit analog circuit of three-phase shortcircuit analog circuit 1 includes：Connected from the outlet side of power transformer 2 to be measured
The first disconnecting switch QS1, first voltage transformer TV1, first couple of circuit breaker Q F11, QF12, the first current transformer TA1 and
First reactor L1, the second short-circuit analog circuit of three-phase shortcircuit analog circuit include the outlet side from power transformer 2 to be measured
The second disconnecting switch QS2, second voltage transformer TV2, second couple of circuit breaker Q F21, QF22, the second current transformer of series connection
TA2 and the second reactor L2, the third phase short circuit analog circuit of three-phase shortcircuit analog circuit are included from power transformer to be measured
The 3rd disconnecting switch QS3, tertiary voltage transformer TV2, the 3rd pair of circuit breaker Q F31, QF32, the 3rd electric current of outlet side series connection
Transformer TA3 and the 3rd reactor L3；Wherein, the first reactor L1 other end, the second reactor L2 other end and the 3rd
The reactor L3 other end is grounded.
By the three-phase shortcircuit analog circuit 1 for the outlet side for being connected in parallel on power transformer 2 to be measured can simulate single-phase short circuit,
Line to line fault, three-phase shortcircuit.Wherein, if closing the first disconnecting switch QS1, the second disconnecting switch QS2, the 3rd disconnecting switch
One in QS3, then simulate single-phase open circuit fault；If close the first disconnecting switch QS1, the second disconnecting switch QS2, the 3rd every
Two closed in QS3 are left, then simulate two-phase short-circuit fault；If the first disconnecting switch QS1, the second disconnecting switch QS2 and
Three disconnecting switch QS3 close, then simulate three phase short circuit fault.
Need what is illustrated, three-phase shortcircuit analog circuit is arrangement identical three-phase shortcircuit analog circuit, i.e.,：
First disconnecting switch QS1, the second disconnecting switch QS2, the 3rd disconnecting switch QS3 are mutually isostructural disconnecting switch,
First pair of circuit breaker Q F11, QF12, second pair of circuit breaker Q F21, QF22, it is that structure is identical with the 3rd pair of circuit breaker Q F31, QF32
Breaker.First current transformer TA1, the second current transformer TA2 and the 3rd current transformer TA3 are mutually isostructural electricity
Current transformer.First voltage transformer TV1, second voltage transformer TV2 and tertiary voltage transformer TV3 are structure identical electricity
Press transformer.First reactor L1, the second reactor L2 and the 3rd reactor L3 are mutually isostructural reactor.
Include the first short-circuit analog circuit, the second short-circuit analog circuit and the 3rd short circuit for three-phase shortcircuit analog circuit 1
Analog circuit.Below, the simulation process of progress single-phase earthing fault, two-phase short-circuit fault, three phase short circuit fault is carried out respectively
Illustrate：
Make to flow through expected short circuit current inside power transformer 2 to be measured as follows, to carry out short trouble
Simulation process：
Step 1, first determine the short trouble to be simulated, it is to be determined including：The mode of short trouble, short trouble
Mode can be single-phase short circuit, line to line fault, one kind in three-phase shortcircuit, short circuit duration, calculate the big of experiment short circuit current
The size of DC component in small and short circuit current.
Step 2, make the no-load running on electric network source of power transformer 2 to be measured.It should be noted that power transformer to be measured
The no-load running of device 2 refers to the first winding access power supply of power transformer 2 to be measured, the working condition of secondary winding open circuit.This
When, the electric current in first winding is referred to as the no-load current of transformer.No-load current produces no-load magnetic field.In main field (i.e. simultaneously
Crosslinking once, the magnetic field of secondary winding) effect under, just induce electromotive force in first winding and secondary winding.
Can be two-winding transformer for power transformer 2 to be measured it should be noted that in the present embodiment, can also
It is three-winding transformer for power transformer 2 to be measured, therefore, is not limited to the two-winding transformer shown in Fig. 2.
If step 3A, simulating single-phase short circuit, according to the size and parameters of electric power system of the experiment short circuit current of calculating
The first reactor L1 is adjusted, either the second reactor L2 numerical value or the 3rd reactor L3, so as to reach short circuit needed for experiment
Electric current.Then step 4A or step 4B or step 4C is performed；
If step 3B, simulating line to line fault, according to the size and parameters of electric power system of the experiment short circuit current of calculating
The numerical value of the first reactor L1, the second reactor L2, two reactors in the 3rd reactor L3 is adjusted, so as to reach experiment institute
Need short circuit current., while two steps corresponding to performing in step 4A, step 4B, step 4C then；
If step 3C, simulating three-phase shortcircuit, according to the size and parameters of electric power system of the experiment short circuit current of calculating
The first reactor L1, the second reactor L2 and the 3rd reactor L3 numerical value are adjusted, so as to reach short circuit current needed for experiment.Connect
, while perform 4A steps, 4B steps and 4C steps.
If the first reactor L1 step 4A, have adjusted according to the size and parameters of electric power system that calculate experiment short circuit current
Numerical value, then first close the first disconnecting switch QS1；Further according to required short circuit current passage time, control circuit breaker Q F11 is with breaking
Road device QF12 successively completes closing operation, sub-switching operation.Specifically, operation sequencing is：Control circuit breaker Q F11 complete
Closing operation → control circuit breaker Q F11, which is completed, into closing operation → control circuit breaker Q F12 completes sub-switching operation → control open circuit
Device QF12 completes sub-switching operation, so as to ensure short circuit duration and closing phase angle Pass Test requirement.
If the second reactor L2 number step 4B, is have adjusted according to the short circuit current of required simulation and parameters of electric power system
Value, then first close the second disconnecting switch QS2, passage time and control circuit breaker Q F21 and open circuit further according to required short circuit current
Device QF22 successively completes closing operation, sub-switching operation.Specifically, operation sequencing is：Circuit breaker Q F21 is controlled to complete
Closing operation → control circuit breaker Q F22 completes closing operation → control circuit breaker Q F21 and completes sub-switching operation → control breaker
QF22 completes sub-switching operation, so as to ensure short circuit duration and closing phase angle Pass Test requirement.
If what is step 4C, adjusted according to the single-phase short circuit current of required simulation and parameters of electric power system is the 3rd reactor
L3 numerical value, then only close the 3rd disconnecting switch QS2；Passage time and control breaker further according to required single-phase short circuit current
QF31 and circuit breaker Q F32 successively completes closing operation, sub-switching operation.Specifically, operation sequencing is：Control open circuit
Device QF31 completions closing operation → control circuit breaker Q F32 completions closing operation → control circuit breaker Q F31 completions sub-switching operation →
Circuit breaker Q F32 is controlled to complete sub-switching operation, so as to ensure short circuit duration and closing phase angle Pass Test requirement.
, can basis from above-mentioned steps as can be seen that although three-phase shortcircuit analog circuit 1 is three-phase identical test loop
Need to carry out single-phase short circuit operation, line to line fault operation, three-phase shortcircuit operation, with for simulating single-phase short circuit, line to line fault, three
Mutually short circuit.
It should be noted that short circuit duration is the standard tested according to transformer short-circuit, if power transformer to be measured 2 has
Body is below 2500kVA transformer, then short circuit duration is 0.5 ± 10%, if power transformer to be measured 2 is specially
Below 2500kVA transformer, then short circuit duration is 0.25 ± 10%.
With reference to previous embodiment, the short-circuit ability to bear checking system for the power transformer that the present embodiment provides：Three-phase electricity
The output end of net bus 3 is connected to the input of power transformer 2 to be measured by No. three input circuits 4 of parallel connection；
The output end of power transformer 2 to be measured is connected to the defeated of three phase network bus 3 by No. three output circuits 5 of parallel connection
Enter end.
Specifically, the arrangement of each road circuit of No. three input circuits 4 is identical each other, each road circuit of No. three output circuits 4
Arrangement it is identical each other.
In a specific embodiment of No. three input circuits 4 of parallel connection, the first output end of three phase network bus output end 3
31 pass through the 4th disconnecting switch QS4, the 4th voltage transformer TV4, the 4th pair of circuit breaker Q F41, QF42, the 4th electric current of series connection
Transformer TA4 is connected to the first input end 21 of power transformer 2 to be measured；Second output end of three phase network bus output end 3
32 pass through the 5th disconnecting switch QS5, the 5th voltage transformer TV5, the 5th pair of circuit breaker Q F51, QF52, the 5th electric current of series connection
Transformer TA5 is connected to the second input 22 of power transformer 2 to be measured；3rd output end of three phase network bus output end 3
33 pass through the 6th disconnecting switch QS6, the 6th voltage transformer TV6, the 6th pair of circuit breaker Q F61, QF62, the 6th electric current of series connection
Transformer TA6 is connected to the 3rd input 23 of power transformer 2 to be measured.
It should be noted that in No. three input circuits 4 in parallel, not necessarily pressed per input circuit 4 all the way in Fig. 2
Order arranges, and can also be that other orders arrange, therefore, No. three input circuits 4 in parallel are except such as Fig. 2 in actual electric network
Shown, it can also be other forms, be not limited to herein shown in Fig. 2.
In a specific embodiment of No. three output circuits 5 of parallel connection, the first output end 24 of power transformer 2 to be measured is logical
Cross the 7th voltage transformer TV71, the 7th pair of circuit breaker Q F71, QF72, the 7th disconnecting switch QS7, the 7th Current Mutual Inductance of series connection
Device TA7, the 8th voltage transformer TV72 are connected to the first input end 34 of three phase network bus input 3；Power transformer to be measured
Second output end 25 of device 2 passes through the 9th voltage transformer TV81 of series connection, the 8th couple of circuit breaker Q F81, QF82, the 8th isolation
It is second defeated to be connected to three phase network bus input 3 by switch QS8, the 8th current transformer TA8, the tenth voltage transformer TV82
Enter end 35；Ten one voltage transformer TV91 of 3rd output end 26 of power transformer 2 to be measured by series connection, the 9th pair of open circuit
Device QF91, QF92, the 9th disconnecting switch QS9, the 9th current transformer TA9, the 12nd voltage transformer TV92 are connected to three-phase
3rd input 36 of power network bus input 3.
It should be noted that in No. three output circuits 5 in parallel, not necessarily pressed per output circuit 5 all the way in Fig. 2
Order arranges, and can also be that other orders arrange, therefore, No. three input circuits 4 in parallel are except such as Fig. 2 in actual electric network
Shown, it can also be other forms, be not limited to herein shown in Fig. 2.
With reference to previous embodiment, in the present embodiment, the input of the first short-circuit analog circuit is connected to electric power to be measured and become
The optional position of the outlet side of depressor 2.For example can be output end and first via output circuit 5 in power transformer 2 to be measured
Between, can also be between any two Tandem devices of first via output circuit 5.
The input of second short-circuit analog circuit is connected to the optional position of the outlet side of power transformer 2 to be measured.Such as
Can be between the output end of power transformer 2 to be measured and No. second output circuit 5, can also be in No. second output circuit 5
Any two Tandem devices between.
The input of 3rd short-circuit analog circuit is connected to the optional position of the outlet side of power transformer 2 to be measured.Such as
Can be between the output end of power transformer 2 to be measured and No. second output circuit 5, can also be in No. threeth output circuit 5
Any two Tandem devices between.
Such as with reference to shown in figure 2, the short-circuit ability to bear checking system of Electrical Transformer：First short circuit simulation
The input of circuit is connected between the circuit breaker Q F72 and the 7th disconnecting switch QS7 of the 7th pair of circuit breaker Q F71, QF72；Second
The input of short-circuit analog circuit is connected to the circuit breaker Q F82 and the 8th disconnecting switch QS8 of the 8th pair of circuit breaker Q F81, QF82
Between；The input of 3rd short-circuit analog circuit be connected to the circuit breaker Q F92 and the 8th of the 9th pair of circuit breaker Q F91, QF92 every
Leave close QS9 between.
During experiment, the three phase network bus 3 of electric network source provides out-put supply；Simultaneously in the defeated of power transformer 2 to be measured
Three phase short circuit fault analog circuit in parallel is used to produce short circuit current after going out end, to verify that it is short that power transformer 2 to be measured is born
The ability on road.
The transformer that there is provided according to embodiments of the present invention and short-circuit ability to bear pilot system high-power transformer is tested,
Based on network power supply system, it is only necessary to access three-phase shortcircuit analog circuit under currently running mode and can be achieved, three-phase
The short-circuit fault simulation plant investment of short-circuit analog circuit is few, simple to operate, convenience in transport, it is not necessary to high power laboratory in addition
Power supply, and the result is more accurate.
The one or more embodiments provided in the present invention, have at least the following technical effects or advantages：
By the outlet side parallel connection three-phase shortcircuit analog circuit of power transformer to be measured, transformer access power network electricity to be measured
Source, the outlet side of power transformer to be measured three phase short circuit fault analog circuit in parallel can simulate required short circuit duration, required
The single-phase short circuit of short circuit current size and DC component, line to line fault and three-phase shortcircuit, so as to using where power transformer
Electric network source is truer, easily simulates the working condition of the power transformer when Power System Shortcuts, realizes to be measured
The operation scene of power transformer is tested, and is also more accurately verified the anti-short circuit capability of power transformer, is realized and dropping
Low experimentation cost, need not to power transformer to be measured transport for long-distance, also without other high power laboratory power supply while,
The accuracy of the result is improved, does not delay normal power supply, it is thus also avoided that cost of transportation；And then the present invention be it is a kind of easy,
Efficiently, the scheme of the anti-short circuit capability of the checking power transformer inexpensive, easy to operate, accuracy is high.
Although preferred embodiments of the present invention have been described, but those skilled in the art once know basic creation
Property concept, then can make other change and modification to these embodiments.So appended claims be intended to be construed to include it is excellent
Select embodiment and fall into having altered and changing for the scope of the invention.
Obviously, those skilled in the art can carry out the essence of various changes and modification without departing from the present invention to the present invention
God and scope.So, if these modifications and variations of the present invention belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising including these changes and modification.
Claims (8)
1. the short-circuit ability to bear checking system of a kind of power transformer, it is characterised in that including three-phase shortcircuit analog circuit；
The outlet side for the power transformer to be measured being connected on the three phase network bus of the electric network source three-phase shortcircuit mould in parallel
Intend circuit；
First short-circuit analog circuit of the three-phase shortcircuit analog circuit includes：From the outlet side string of the power transformer to be measured
The first disconnecting switch, first voltage transformer, first pair of breaker, the first current transformer and the first reactor of connection, it is described
Second short-circuit analog circuit of three-phase shortcircuit analog circuit includes second to be connected from the outlet side of the power transformer to be measured
Disconnecting switch, second voltage transformer, second pair of breaker, the second current transformer and the second reactor, the three-phase shortcircuit
The third phase short circuit analog circuit of analog circuit includes keeping apart from the 3rd of the outlet side series connection of the power transformer to be measured
Pass, tertiary voltage transformer, the 3rd pair of breaker, the 3rd current transformer and the 3rd reactor；Wherein, first reactor
The other end, the other end of second reactor and the other end of the 3rd reactor be grounded.
2. the short-circuit ability to bear checking system of power transformer as claimed in claim 1, it is characterised in that three-phase shortcircuit mould
Intend circuit as arrangement identical three-phase shortcircuit analog circuit.
3. the short-circuit ability to bear checking system of power transformer as claimed in claim 1 or 2, it is characterised in that
The output end of the three phase network bus is connected to the power transformer to be measured by No. three input circuits of parallel connection
Input；
The output end of the power transformer to be measured is connected to the three phase network bus by No. three output circuits of parallel connection
Input.
4. the short-circuit ability to bear checking system of power transformer as claimed in claim 3, it is characterised in that three road is defeated
Enter that the circuit arrangement of circuit is identical each other, the circuit arrangement of No. three output circuit is identical each other.
5. the short-circuit ability to bear checking system of power transformer as claimed in claim 4, it is characterised in that
The 4th disconnecting switch by series connection of the first output end in the output end of the three phase network bus, the 4th mutual induction of voltage
Device, the 4th pair of breaker, the 4th current transformer are connected to the first input end in the input of the power transformer to be measured；
The 5th disconnecting switch by series connection of the second output end in the output end of the three phase network bus, the 5th mutual induction of voltage
Device, the 5th pair of breaker, the 5th current transformer are connected to the second input in the input of the power transformer to be measured；
The 6th disconnecting switch by series connection of the 3rd output end in the output end of the three phase network bus, the 6th mutual induction of voltage
Device, the 6th pair of breaker, the 6th current transformer are connected to the 3rd input in the input of the power transformer to be measured.
6. the short-circuit ability to bear checking system of power transformer as claimed in claim 4, it is characterised in that
The first output end in the output end of the power transformer to be measured by the 7th voltage transformer of series connection, the 7th pair it is disconnected
Road device, the 7th disconnecting switch, the 7th current transformer, the 8th voltage transformer are connected to the three phase network bus input
First input end in input；
The second output end in the output end of the power transformer to be measured by the 9th voltage transformer of series connection, the 8th pair it is disconnected
Road device, the 8th disconnecting switch, the 8th current transformer, the tenth voltage transformer are connected to the three phase network bus input
The second input in input；
The 3rd output end in the output end of the power transformer to be measured by the 11st voltage transformer of series connection, the 9th pair
Breaker, the 9th disconnecting switch, the 9th current transformer, the 12nd voltage transformer are connected to the three phase network bus input
The 3rd input in the input at end.
7. the short-circuit ability to bear checking system of power transformer as claimed in claim 6, it is characterised in that
The input of the first short-circuit analog circuit is connected between the 7th pair of breaker and the 7th disconnecting switch；
The input of the second short-circuit analog circuit is connected between the 8th pair of breaker and the 8th disconnecting switch；
The input of the 3rd short-circuit analog circuit is connected between the 9th pair of breaker and the 9th disconnecting switch.
8. the short-circuit ability to bear checking system of power transformer as claimed in claim 1, it is characterised in that the electricity to be measured
Power transformer is specially two-winding transformer or three-winding transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710834037.8A CN107748311B (en) | 2017-09-15 | 2017-09-15 | Short circuit bearing capacity verification system of power transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710834037.8A CN107748311B (en) | 2017-09-15 | 2017-09-15 | Short circuit bearing capacity verification system of power transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107748311A true CN107748311A (en) | 2018-03-02 |
| CN107748311B CN107748311B (en) | 2021-01-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710834037.8A Active CN107748311B (en) | 2017-09-15 | 2017-09-15 | Short circuit bearing capacity verification system of power transformer |
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| CN110518811A (en) * | 2019-09-23 | 2019-11-29 | 苏州工业园区海沃科技有限公司 | A kind of distribution transformer energy-storage impact power supply |
| CN111208470A (en) * | 2020-02-21 | 2020-05-29 | 中国电力科学研究院有限公司 | Method and system for testing short circuit bearing capacity of voltage transformer |
| CN112816906A (en) * | 2020-12-28 | 2021-05-18 | 国电南瑞科技股份有限公司 | Distribution network direct-current transformer medium-voltage side bipolar short-circuit test platform and method |
| CN116087866A (en) * | 2023-04-11 | 2023-05-09 | 山东泰开互感器有限公司 | Short-circuit resistance test system and method for secondary grounding system of current transformer |
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