CN207780154U - A kind of power transformer is without neutral point side winding comprehensive test device - Google Patents
A kind of power transformer is without neutral point side winding comprehensive test device Download PDFInfo
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- CN207780154U CN207780154U CN201721891404.XU CN201721891404U CN207780154U CN 207780154 U CN207780154 U CN 207780154U CN 201721891404 U CN201721891404 U CN 201721891404U CN 207780154 U CN207780154 U CN 207780154U
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Abstract
The utility model discloses a kind of power transformers without neutral point side winding comprehensive test device, including ac power supply circuit, power supply switch circuit, rectification module, voltage changing module, transformation ratio test module, D.C. resistance test module, commutation switching circuit and D.C. resistance test interface panel；Ac power supply circuit is that voltage changing module and rectification module are powered by power supply switch circuit, i.e., respectively transformation ratio test module and the power supply of D.C. resistance test module, D.C. resistance test module connects D.C. resistance test interface panel by commutation switching circuit.The utility model can be completed the two-phase of the switching and power transformer of mechanism for testing alternating-current voltage source and DC current source without neutral point side winding by power supply switch circuit and commutation switching circuit, by simple push-botton operation and measure, and be not necessarily to multiple rewiring.
Description
Technical field
The utility model is related to test device technical fields more particularly to a kind of power transformer to be used without neutral point side winding
Comprehensive test device.
Background technology
Power transformer is one of electric system important equipment, it safe and reliable to operation whether is directly related to entire electricity
The safety of Force system.Given this, China's electric power installation testing regulations and national grid power transmission and transformation equipment state detection experiment rule
Stringent, detailed regulation has all been done to power transformer test project in journey.In power transformer test project, D.C. resistance
Test and the test of voltage ratio are particularly significant, and D.C. resistance test can detect transformer winding welding quality, tap switch contact is
The defects of whether no good, layer, turn-to-turn are short-circuit, voltage can check whether the number of turns of each winding of power transformer accords with than test
Close design and service requirement.The two test events are respectively adopted two sets of test devices and are tested at present, are needed in test process
It, need to be to AB phases, BC phases, CA phases when frequently change wiring, especially power transformer is tested without neutral point side winding D.C. resistance
It more needs to test respectively, wiring is very frequent, and very big inconvenience is brought to test job, causes the testing time longer.In fact, direct current
Resistance testing device includes DC current source, D.C. resistance test module, interface board and processor, display screen etc., and transformation ratio is surveyed
Trial assembly is set including alternating current voltage source, transformation ratio test module, interface board and processor, display screen；And the two projects are adopted
The reason of being tested respectively with two covering devices is only that the difference of D.C. resistance test and voltage than the power supply natures that both tests use
Different, can mutually switching for D.C. resistance test module and transformation ratio test module is general.
Utility model content
The purpose of this utility model is to provide a kind of power transformer without neutral point side winding comprehensive test device, passes through
Shirtsleeve operation, without changing wiring, you can selection carry out D.C. resistance test or voltage than test and power transformer without
Neutral point side winding two-phase D.C. resistance is tested.
The technical solution adopted in the utility model is：
A kind of power transformer switches without neutral point side winding comprehensive test device, including ac power supply circuit, power supply
Circuit, rectification module, voltage changing module, transformation ratio test module, D.C. resistance test module, commutation switching circuit and D.C. resistance
Test interface panel；The cut ends of the power supply output end connection power supply switch circuit of the ac power supply circuit, power supply switching
The output end connection transformation ratio of the input terminal of the alternating voltage source output terminal connection voltage changing module of circuit, voltage changing module tests mould
Block, the input terminal of the current source output connection rectification module of power supply switch circuit, the output end of rectification module connect direct current
Test module is hindered, rectification module is powered for D.C. resistance test module, constitutes direct current power supply loop, D.C. resistance test module
Output end connects commutation switching circuit, and the first notch of A phases of commutation switching circuit connects A phases on D.C. resistance test interface panel
Current input terminal mouth, the second notch of A phases connect A phase current output ports on D.C. resistance test interface panel, the first notch of B phases
B phase current input ports on D.C. resistance test interface panel are connected, the second notch of B phases connects D.C. resistance test interface panel
Upper B phase currents output port, the first notch of C phases connect C phase current input ports on D.C. resistance test interface panel, C phases the
Two incisions connect C phase current output ports on D.C. resistance test interface panel.
For the power transformer without neutral point side winding comprehensive test device, the power supply switch circuit includes electricity
Source master switch, the first normally closed button, the first normally opened button, the second normally closed button and the second normally opened button；It further include the first relay
Device and the second relay；
The first normally closed button, the first normally opened button, the second relay normally-closed contact and the first relay line
Circle is series in ac power supply circuit, and the first normally opened contact of the first relay is parallel to the both ends of the first normally opened button, and first
Second normally opened contact of relay is serially connected between power supply output end and the input terminal of voltage changing module of ac power supply circuit；
The second normally closed button, the second normally opened button, the first relay normally-closed contact and the second relay line
Circle is series in ac power supply circuit, and the first normally opened contact of the second relay is parallel to the both ends of the second normally opened button, and second
Second normally opened contact of relay is serially connected between power supply output end and the input terminal of rectification module of ac power supply circuit.
The power transformer further includes heat portective switch without neutral point side winding comprehensive test device, described
Heat portective switch is serially connected between the power supply output end of ac power supply circuit and the first normally closed button, and heat portective switch is serially connected with
Between the power supply output end of ac power supply circuit and the second normally closed button.
The power transformer further includes first fuse, second molten without neutral point side winding comprehensive test device
Disconnected device and third fuse, the first fuse be serially connected with ac power supply circuit power supply output end and heat portective switch it
Between, second fuse is serially connected between the second normally opened contact of the first relay and the input terminal of voltage changing module, third fuse
It is serially connected between the second normally opened contact of the second relay and the input terminal of rectification module.
The commutation switching circuit includes that the normally closed button of third, the normally opened button of third, the 4th normally closed button and the 4th are normal
Open button and the 5th normally closed button, the 5th normally opened button；Third relay, the 4th relay and the 5th relay；
The normally closed button of the third, third normally opened button, the first normally-closed contact of the 4th relay, the 5th relay
The coil of first normally-closed contact and third relay is series in direct current power supply loop, and the first normally opened contact of third relay is simultaneously
It is coupled to the both ends of the normally opened button of third, the second normally opened contact, A phase currents input port, the A phase current output ends of third relay
Mouth is serially connected between power supply output end and the input terminal of voltage changing module of direct current power supply loop；
The 4th normally closed button, the 4th normally opened button, the second normally-closed contact of the 5th relay, third relay
The coil of the normally-closed contact of first normally-closed contact and the 4th relay is series in direct current power supply loop, and the first of the 4th relay
Normally opened contact is parallel to the both ends of the 4th normally opened button, the second normally opened contact, B phase currents input port and the B of the 4th relay
Phase current output port is serially connected between power supply output end and the input terminal of voltage changing module of direct current power supply loop；
The 5th normally closed button, the 5th normally opened button, the second normally-closed contact of third relay, the 4th relay
The coil of second normally-closed contact and the 5th relay is series in direct current power supply loop, and the first normally opened contact of the 5th relay is simultaneously
It is coupled to the both ends of the 5th normally opened button, the second normally opened contact, C phase currents input port, the C phase current output ends of the 5th relay
Mouth is serially connected between power supply output end and the input terminal of voltage changing module of direct current power supply loop.
Survey can be completed by power supply switch circuit and commutation switching circuit, by simple push-botton operation in the utility model
Two-phase of the switching and power transformer of test-run a machine structure alternating-current voltage source and DC current source without neutral point side winding measures, from
And when carrying out voltage than test and D.C. resistance test to power transformer, it is not necessarily to multiple rewiring, enormously simplifies test
Process has saved the testing time, improves the working efficiency of staff.
Description of the drawings
Fig. 1 is the principles of the present invention block diagram；
Fig. 2 is the circuit diagram of the power supply switch circuit of the utility model.
Specific implementation mode
Technical scheme of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation
Example is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
The every other embodiment that personnel are obtained without making creative work, shall fall within the protection scope of the present invention.
As depicted in figs. 1 and 2, the utility model includes ac power supply circuit, power supply switch circuit, rectification module, transformation
Module, transformation ratio test module, D.C. resistance test module, commutation switching circuit and D.C. resistance test interface panel；It is described
Ac power supply circuit power supply output end connection power supply switch circuit cut ends, the alternating-current voltage source of power supply switch circuit is defeated
Outlet connects the input terminal of voltage changing module, and the output end of voltage changing module connects transformation ratio test module, the electricity of power supply switch circuit
The input terminal of source output terminal connection rectification module is flowed, the output end of rectification module connects D.C. resistance test module, rectification module
It powers for D.C. resistance test module, constitutes direct current power supply loop, the output end connection commutation switching of D.C. resistance test module
Circuit, the first notch of A phases of commutation switching circuit, the second notch of A phases, the first notch of B phases, the second notch of B phases, C phases first are cut
A phase current input port A+, A phase current output ports A-, B on mouth, the second notch of C phases difference D.C. resistance test interface panel
Phase current input port B+, B phase current output port B-, C phase current input port C+, C phase current output ports C-.
Transformation ratio test module, D.C. resistance test module and processor in comprehensive test device, power transformer and aobvious
The connection of display screen is the prior art, is repeated no more.
As shown in Fig. 2, the power supply switch circuit include battery main switch QF, the first normally closed button SB1-1, first often
Open button SB1-2, the second normally closed normally opened button SB2-2 of button SB2-1 and second；Further include the first relay and the second relay
Device；
The first normally closed button SB1-1, the first normally opened button SB1-2, the second relay normally-closed contact KM2-2 and
The coil KM1 of first relay is series in ac power supply circuit, and the first normally opened contact KM1-1 of the first relay is parallel to
The both ends of one normally opened button SB1-2, the power supply that the second normally opened contact KM1-3 of the first relay is serially connected with ac power supply circuit are defeated
Between outlet and the input terminal of voltage changing module；
The second normally closed button SB2-1, the second normally opened button SB2-2, the first relay normally-closed contact KM1-2 and
The coil KM2 of second relay is series in ac power supply circuit, and the first normally opened contact KM2-1 of the second relay is parallel to
The both ends of two normally opened button SB2-2, the power supply that the second normally opened contact KM2-3 of the second relay is serially connected with ac power supply circuit are defeated
Between outlet and the input terminal of rectification module.
The handoff procedure of power supply switch circuit is as follows：When needing to carry out voltage than test to power transformer, electricity is closed
Source master switch QF, presses the first normally opened button SB1-2, the coil KM1 of the first relay obtain it is electric, meanwhile, the of the first relay
One normally opened contact KM1-1 is closed, by the first normally opened button SB1-2 short circuits, the first relay after the first normally opened button SB1-2 resets
Coil still it is electric；Second normally opened contact KM1-3 of the first relay is closed, and the normally-closed contact KM1-2 of the first relay is opened,
Voltage is connected than test module by the power supply output end of voltage changing module and ac power supply circuit, and electric current can not lead to than test module
The power supply output end of over commutation module and ac power supply circuit is connected, and can only carry out voltage at this time than test.
After the completion of voltage is than test, press the first normally closed button SB1-1, the coil KM1 dead electricity of the first relay, first after
First normally opened contact KM1-1 of electric appliance and the second normally opened contact KM1-3 of the first relay return to opening state, the first relay
Normally-closed contact KM1-2 return to closed state, ac power supply circuit is no longer that voltage is powered than test module.
When need to power transformer carry out D.C. resistance test when, power turn-on master switch QF, press second it is normally opened by
Button SB2-2, the coil KM2 of the second relay obtain it is electric, meanwhile, the first normally opened contact KM2-1 of the second relay is closed, by second
Normally opened button SB2-2 short circuit, after the second normally opened button SB2-2 resets the second relay coil still it is electric；Second relay
Second normally opened contact KM2-3 is closed, and the normally-closed contact KM2-2 of the second relay is opened, and D.C. resistance test module passes through rectification
The power supply output end of module and ac power supply circuit is connected, and transformation ratio test module module can not be with the power supply of ac power supply circuit
Output end is connected, and can only carry out D.C. resistance test at this time.
When voltage need to be carried out continuously than test and D.C. resistance test, after having carried out voltage than test, need to only press
Second normally opened button SB2-2, then the coil KM2 of the second relay obtain electric, the normally-closed contact KM2-2 of the second relay is opened, and is handed over
Current supply circuit is flowed no longer to power for mechanism for testing by voltage changing module；Meanwhile second first normally opened contact KM2-1 of relay close
It closes, the second normally opened contact KM2-3 of the second relay is closed, and termination is exported by the power supply of rectification module and ac power supply circuit
It is logical, it is directly switch into D.C. resistance test module and ac power supply circuit conducting state, carries out D.C. resistance test at this time.
After having carried out D.C. resistance test, the first normally opened button SB1-2 only need to be pressed, then the coil of the first relay
KM1 obtains electric, and the normally-closed contact KM1-2 of the first relay is opened, and ac power supply circuit is no longer mechanism for testing by rectification module
Power supply；Meanwhile first first normally opened contact KM1-1 of relay be closed, the second normally opened contact KM1-3 of the first relay is closed
Close, by the power supply output end of voltage changing module and ac power supply circuit connect, be directly switch into voltage than test module with exchange
The state of current supply circuit conducting carries out voltage than test at this time.
The power transformer further includes heat portective switch FR1 without neutral point side winding comprehensive test device, described
Heat portective switch FR1 be serially connected between the power supply output end of ac power supply circuit and the first normally closed button SB1-1, and Thermal protection
Switch FR1 is serially connected between the power supply output end of ac power supply circuit and the second normally closed button SB2-1.Heat portective switch FR1 is used
In overload protection, relay, voltage changing module or rectification module damage are prevented.
The power transformer further includes first fuse FU1, second without neutral point side winding comprehensive test device
Fuse FU2 and third fuse FU3, the first fuse FU1 be serially connected with ac power supply circuit power supply output end and
Between heat portective switch FR1, second fuse FU2 is serially connected with the second normally opened contact KM1-3 and voltage changing module of the first relay
Input terminal between, third fuse FU3 is serially connected with the input of the second normally opened contact KM2-3 and rectification module of the second relay
Between end.First fuse FU1, second fuse FU2 and third fuse FU3 can go out in the current supply circuit of the utility model
When existing failure, rapid disengagement failure electric current prevents failure propagation, protects the first relay in time, the second relay, becomes pressing mold
Block, rectification module and mechanism for testing.
As shown in Fig. 2, the commutation switching circuit include the normally closed button SB3-1 of third, the normally opened button SB3-2 of third,
The normally closed button SB5-1 of 4th normally closed normally opened button 4-2 and the 5th of button SB4-1 and the 4th, the 5th normally opened button SB5-2；The
Three relays, the 4th relay and the 5th relay KM5；
The first normally-closed contact of the normally closed button SB3-1 of the third, the normally opened button SB3-2 of third, the 4th relay
The coil KM3 of KM4-2, the first normally-closed contact KM5-2 of the 5th relay KM5 and third relay are series at direct current power supply loop
In, the first normally opened contact KM3-1 of third relay is parallel to the both ends of the normally opened button SB3-2 of third, and the of third relay
The power supply that two normally opened contact KM3-4, A phase current input port A+, A phase current output port A- are serially connected with direct current power supply loop is defeated
Between outlet and the input terminal of voltage changing module；
The second normally-closed contact of the 4th normally closed button SB4-1, the 4th normally opened button 4-2, the 5th relay KM5
The coil KM4 of KM5-3, the first normally-closed contact KM3-2 of third relay and the 4th relay are series in direct current power supply loop,
First normally opened contact KM4-1 of the 4th relay is parallel to the both ends of the 4th normally opened button 4-2, and the second of the 4th relay is normally opened
Contact KM4-4, B phase current input port B+and B phase current output ports B- are serially connected with the power supply output end of direct current power supply loop
Between the input terminal of voltage changing module；
The second normally-closed contact of the 5th normally closed button SB5-1, the 5th normally opened button SB5-2, third relay
The coil of KM3-3, the second normally-closed contact KM4-3 of the 4th relay and the 5th relay KM5 are series in direct current power supply loop,
The first normally opened contact of 5th relay KM5 is parallel to the both ends of the 5th normally opened button SB5-2, and the second of the 5th relay KM5
Normally opened contact, C phase current input port C+, C phase current output ports C- be serially connected with direct current power supply loop power supply output end and
Between the input terminal of voltage changing module.
The course of work of commutation switching circuit is as follows：It was tested in D.C. resistance of the power transformer without neutral point side winding
Cheng Zhong presses the normally opened button SB3-2 of third when that need to test AB phase D.C. resistances, the coil KM3 of third relay obtain it is electric,
Meanwhile the first normally opened contact KM3-1 of third relay is closed, by the normally opened button SB3-2 short circuits of third, the normally opened button of third
SB3-2 reset after third relay coil still it is electric；Second normally opened contact KM3-4 of third relay is closed, third relay
The normally-closed contact KM2-2 of device is opened, and the direct current power supply loop that rectification module provides only powers to AB phases, and electric current is from A phase currents
Input port A+ flows into A phase windings and B phase windings, and direct current power supply loop, BC phases and CA are returned through B phase current output ports B-
It is not connected with direct current power supply loop mutually.
When that need to test AB phase D.C. resistances, third normally opened button SB3-2 is pressed, the coil KM3 of third relay is obtained
Electricity, meanwhile, the first normally opened contact KM3-1 of third relay is closed, and by the normally opened button SB3-2 short circuits of third, third is normally opened to press
After button SB3-2 resets third relay coil still it is electric；Second normally opened contact KM3-4 of third relay is closed, third after
First normally-closed contact KM3-2 of electric appliance and the second normally-closed contact KM3-3 of third relay are opened, and rectification module provides straight
Stream current supply circuit only powers to AB phases, and electric current flows into A phase windings and B phase windings from A phase current input ports A+, through B phase electricity
It flows output port B- and returns to direct current power supply loop, BC phases and CA phases are not connected with direct current power supply loop.
When that need to test BC phase D.C. resistances, press the 4th normally opened button 4-2, the coil KM4 of the 4th relay obtain it is electric,
Meanwhile the 4th first normally opened contact KM4-1 of relay be closed, by the 4th normally opened button 4-2 short circuits, the 4th normally opened button 4-2
After reset the 4th relay coil still it is electric；Second normally opened contact KM4-4 of the 4th the 4th relay is closed, the 4th relay
The first normally-closed contact KM4-2 and the second normally-closed contact KM4-3 of the 4th relay open, the direct current that rectification module provides supplies
Electrical circuit only powers to BC phases, and electric current is defeated through C phase currents from B phase currents input port B+inflow B phase windings and C phase windings
Exit port C- returns to direct current power supply loop, and AB phases and CA phases are not connected with direct current power supply loop.
When that need to test CA phase D.C. resistances, the 5th normally opened button SB5-2 is pressed, the coil of the 5th relay KM5 obtains
Electricity, meanwhile, the first normally opened contact of the 5th relay KM5 is closed, by the 5th normally opened button SB5-2 short circuits, the 5th normally opened button
SB5-2 reset after the 5th relay KM5 coils still it is electric；The second normally opened contact of 5th relay KM5 is closed, the 5th relay
The second normally-closed contact KM5-3 of the first normally-closed contact KM5-2 and the 5th relay KM5 of device KM5 are opened, and rectification module provides
Direct current power supply loop only power to CA phases, electric current flows into C phase windings and A phase windings from C phase current input ports C+, through A
Phase current output port A- returns to direct current power supply loop, and AB phases and BC phases are not connected with direct current power supply loop.
Survey can be completed by power supply switch circuit and commutation switching circuit, by simple push-botton operation in the utility model
Two-phase of the switching and power transformer of test-run a machine structure alternating-current voltage source and DC current source without neutral point side winding measures, from
And when carrying out voltage than test and D.C. resistance test to power transformer, it is not necessarily to multiple rewiring, enormously simplifies test
Process has saved the testing time, improves the working efficiency of staff.
Finally it should be noted that：The above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Present invention has been described in detail with reference to the aforementioned embodiments for pipe, it will be understood by those of ordinary skill in the art that：Its according to
So can with technical scheme described in the above embodiments is modified, either to which part or all technical features into
Row equivalent replacement；And these modifications or replacements, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (5)
1. a kind of power transformer is without neutral point side winding comprehensive test device, it is characterised in that：Including ac power supply circuit,
Power supply switch circuit, rectification module, voltage changing module, transformation ratio test module, D.C. resistance test module, commutation switching circuit and
D.C. resistance test interface panel；The cut ends of the power supply output end connection power supply switch circuit of the ac power supply circuit,
The input terminal of the alternating voltage source output terminal connection voltage changing module of power supply switch circuit, the output end of voltage changing module connect transformation ratio
Test module, the input terminal of the current source output connection rectification module of power supply switch circuit, the output end connection of rectification module
D.C. resistance test module, rectification module are powered for D.C. resistance test module, constitute direct current power supply loop, D.C. resistance test
The output end of module connects commutation switching circuit；The first notch of A phases connection D.C. resistance test interface face of commutation switching circuit
A phase currents input port on plate, the second notch of A phases connect A phase current output ports on D.C. resistance test interface panel, B phases
First notch connects B phase current input ports on D.C. resistance test interface panel, and the second notch of B phases connects D.C. resistance test
B phase currents output port on interface panel, the first notch of C phases connect C phase current input terminals on D.C. resistance test interface panel
Mouthful, the second notch of C phases connects C phase current output ports on D.C. resistance test interface panel.
2. power transformer according to claim 1 is without neutral point side winding comprehensive test device, it is characterised in that：Institute
The power supply switch circuit stated includes that battery main switch, the first normally closed button, the first normally opened button, the second normally closed button and second are normal
Open button；Further include the first relay and the second relay；
The coil string of the first normally closed button, the first normally opened button, the normally-closed contact of the second relay and the first relay
It is coupled in ac power supply circuit, the first normally opened contact of the first relay is parallel to the both ends of the first normally opened button, the first relay
Second normally opened contact of device is serially connected between power supply output end and the input terminal of voltage changing module of ac power supply circuit；
The coil string of the second normally closed button, the second normally opened button, the normally-closed contact of the first relay and the second relay
It is coupled in ac power supply circuit, the first normally opened contact of the second relay is parallel to the both ends of the second normally opened button, the second relay
Second normally opened contact of device is serially connected between power supply output end and the input terminal of rectification module of ac power supply circuit.
3. power transformer according to claim 2 is without neutral point side winding comprehensive test device, it is characterised in that：Also
Including heat portective switch, the heat portective switch be serially connected with ac power supply circuit power supply output end and the first normally closed button it
Between, and heat portective switch is serially connected between the power supply output end of ac power supply circuit and the second normally closed button.
4. power transformer according to claim 3 is without neutral point side winding comprehensive test device, it is characterised in that：Also
Including first fuse, second fuse and third fuse, the first fuse is serially connected with the confession of ac power supply circuit
Between electricity output end and heat portective switch, second fuse is serially connected with second normally opened contact and voltage changing module of the first relay
Between input terminal, third fuse is serially connected between the second normally opened contact of the second relay and the input terminal of rectification module.
5. power transformer according to claim 1 is without neutral point side winding comprehensive test device, it is characterised in that：Institute
The commutation switching circuit stated include the normally closed button of third, the normally opened button of third, the 4th normally closed button and the 4th normally opened button and
5th normally closed button, the 5th normally opened button；Third relay, the 4th relay and the 5th relay；
The first of the normally closed button of the third, the normally opened button of third, the first normally-closed contact of the 4th relay, the 5th relay
The coil of normally-closed contact and third relay is series in direct current power supply loop, and the first normally opened contact of third relay is parallel to
The both ends of the normally opened button of third, the second normally opened contact, A phase currents input port, the A phase current output port strings of third relay
It is connected between power supply output end and the input terminal of voltage changing module of direct current power supply loop；
The first of the 4th normally closed button, the 4th normally opened button, the second normally-closed contact of the 5th relay, third relay
The coil of the normally-closed contact of normally-closed contact and the 4th relay is series in direct current power supply loop, and the first of the 4th relay is normally opened
Contact shunt is in the both ends of the 4th normally opened button, the second normally opened contact, B phase currents input port and the B phase electricity of the 4th relay
Stream output port is serially connected between power supply output end and the input terminal of voltage changing module of direct current power supply loop；
The second of the 5th normally closed button, the 5th normally opened button, the second normally-closed contact of third relay, the 4th relay
The coil of normally-closed contact and the 5th relay is series in direct current power supply loop, and the first normally opened contact of the 5th relay is parallel to
The both ends of 5th normally opened button, the second normally opened contact, C phase currents input port, the C phase current output port strings of the 5th relay
It is connected between power supply output end and the input terminal of voltage changing module of direct current power supply loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721891404.XU CN207780154U (en) | 2017-12-29 | 2017-12-29 | A kind of power transformer is without neutral point side winding comprehensive test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721891404.XU CN207780154U (en) | 2017-12-29 | 2017-12-29 | A kind of power transformer is without neutral point side winding comprehensive test device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207780154U true CN207780154U (en) | 2018-08-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721891404.XU Active CN207780154U (en) | 2017-12-29 | 2017-12-29 | A kind of power transformer is without neutral point side winding comprehensive test device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110888084A (en) * | 2019-11-27 | 2020-03-17 | 天威保变（秦皇岛）变压器有限公司 | Method for measuring short-circuit point of winding coil of large transformer |
| CN112834839A (en) * | 2020-12-28 | 2021-05-25 | 深圳供电局有限公司 | Portable device and system for transformer field comprehensive test |
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2017
- 2017-12-29 CN CN201721891404.XU patent/CN207780154U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110888084A (en) * | 2019-11-27 | 2020-03-17 | 天威保变（秦皇岛）变压器有限公司 | Method for measuring short-circuit point of winding coil of large transformer |
| CN112834839A (en) * | 2020-12-28 | 2021-05-25 | 深圳供电局有限公司 | Portable device and system for transformer field comprehensive test |
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