CN203660503U - Power distribution transformer secondary overheat protection self-locking circuit - Google Patents
Power distribution transformer secondary overheat protection self-locking circuit Download PDFInfo
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- CN203660503U CN203660503U CN201320873494.5U CN201320873494U CN203660503U CN 203660503 U CN203660503 U CN 203660503U CN 201320873494 U CN201320873494 U CN 201320873494U CN 203660503 U CN203660503 U CN 203660503U
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- 238000002955 isolation Methods 0.000 claims description 6
- 238000013021 overheating Methods 0.000 claims description 5
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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Abstract
The utility model relates to a power distribution transformer secondary overheat protection self-locking circuit and belongs to the power distribution transformer overheat protection technical field. The objective of the utility model is to provide an economical and practical overheat protection circuit capable of accurately cutting off a power distribution transformer secondary overheat line. The power distribution transformer secondary overheat protection circuit includes an isolating change-over switch Q1, a power distribution transformer T1, a circuit breaker DZ1, an alternating current contactor CJ1, a thermal relay RJ1, a start button QA1, a stop button TA1, fuses RT1 and RT2, indicating lights XHD1 and XHD2, an intermediate relay ZJ1 and a time relay SJ1. The power distribution transformer secondary overheat protection circuit of the utility model is suitable for power sectors.
Description
Technical field
The utility model distribution transformer secondary overtemperature protection latching circuit, belongs to distribution transformer overheating protection circuit technical field.
Background technology
The static electrical equipment of one that transmits AC energy in distribution transformer assignment electric system according to law of electromagnetic induction conversion alternating voltage and electric current, is contained on electric pole or in distribution substation conventionally, generally voltage can be down to about 400 volts from 6～10 kilovolts and input users; In the time that a winding passes to alternating current, just produce the magnetic flux of alternation, the magnetic flux of alternation is by the effect of iron core magnetic conduction, just in secondary winding, induce AC electromotive force, the height of secondary induced electromotive force is relevant with the number of a secondary winding number of turn, be that voltage swing is directly proportional to the number of turn, Main Function is electric energy transmitting, is electric equipment important in existing distribution network.
In service at distribution transformer, have because of the excessive underrun of capacity, also have and cause apparatus overheat because of overload or overcurrent operation, the situation of even burning, the equipment of present transformer overtemperature protection has a variety of, but mostly adopt the mode in primary side protection, and can not direct replacement to existing transformer, improvement expenses is very expensive, the quantity of existing common distribution transformer is very many, promote very inconvenient, and for the transformer with many group secondary side outputs, only install protection additional at primary side, as long as branch road of secondary side breaks down, whole circuit all will have a power failure, also very uneconomical.
Summary of the invention
The utility model overcomes the deficiency that prior art exists, and technical problem to be solved is: provide a kind of distribution transformer secondary that can accurately cut off to cross heat circuit and economical and practical overheating protection circuit.
For solving the problems of the technologies described above; the technical solution adopted in the present invention is: distribution transformer secondary overtemperature protection latching circuit; it is characterized in that: comprising: isolation reversing switch Q1; distribution transformer T1; circuit breaker DZ1, A.C. contactor CJ1, thermal relay RJ1, start button QA1, stop button TA1, fuse RT1, RT2, indicator light XHD1, XHD2, intermediate relay ZJ 1 and time relay sj 1, wherein:
The coil of A.C. contactor CJ1 is CJ1.1, and its main contacts is CJ1.2, and normally opened contact is CJ1.3, and normally-closed contact is CJ1.4;
The normally opened contact of thermal relay RJ1 is RJ1.1;
The coil of intermediate relay ZJ 1 is ZJ1.1, and normally-closed contact is ZJ1.2, and normally opened contact is ZJ1.3;
The coil of time relay sj 1 is SJ1.1, and its timing closing contact is SJ1.2;
The main circuit of described distribution transformer T1 is: after the end of incoming cables of described distribution transformer T1 serial connection isolation reversing switch Q1, be connected with high voltage source, the main contacts CJ1.2 that the leading-out terminal of described distribution transformer T1 is connected in series circuit breaker DZ1, A.C. contactor CJ1 successively with after thermal relay RJ1, be connected with low-tension supply output;
The control circuit structure of bis-overheating protection circuits of described distribution transformer T1 is: after the serial connection fuse RT1 of one end of described stop button TA1, be connected with control circuit positive source, the other end of stop button TA1 is connected with one end of start button QA1 successively and after connecing one end, one end of normally opened contact ZJ1.3 of intermediate relay ZJ 1 and one end of the normally-closed contact CJ1.4 of A.C. contactor CJ1 of timing closing contact SJ1.2 of one end, the time relay sj 1 of the normally opened contact CJ1.3 of A.C. contactor CJ1; The other end of described start button QA1 successively and connect behind one end of the other end, one end of indicator light XHD1 and the normally opened contact RJ1.1 of thermal relay RJ1 of the normally opened contact CJ1.3 of A.C. contactor CJ1 with one end of the coil CJ1.1 of A.C. contactor CJ1 and be connected;
The other end of the coil CJ1.1 of described A.C. contactor CJ1 is connected with one end of the normally-closed contact ZJ1.2 of intermediate relay ZJ 1, the other end of the normally opened contact RJ1.1 of described thermal relay RJ1 is connected with one end of the coil SJ1.1 of time relay sj 1, the other end of the timing closing contact SJ1.2 of described time relay sj 1 and connect the other end of normally opened contact ZJ1.3 of intermediate relay ZJ 1 after be connected with one end of the coil ZJ1.1 of intermediate relay ZJ 1, the other end of the normally-closed contact CJ1.4 of described A.C. contactor CJ1 is connected with one end of indicator light XHD2;
The other end of the normally-closed contact ZJ1.2 of described intermediate relay ZJ 1 is connected with one end of fuse RT2 successively and after connecing the other end of coil ZJ1.1 of the other end, intermediate relay ZJ 1 of the coil SJ1.1 of the other end, the time relay sj 1 of indicator light XHD1 and the other end of indicator light XHD2, and the other end of described fuse RT2 is connected with control circuit power cathode.
Compared with prior art, the utlity model has following beneficial effect: the utility model can, in the situation that not destroying existing protective circuit, be connected on distribution transformer easily, and can expanded application at multichannel secondary line, only can excise fault secondary circuit, economical and practical; The utility model has added delay protection device simultaneously, even in the time that hot power-off setting value is the action of rated value thermal protector, main circuit also can not cut off at once, but normally operation; When reaching after delay time; whole protective device just starts action; cut off secondary circuit, due to the existence of self-locking device, secondary circuit is thoroughly cut off; protection transformer can not burn out; can not affect other branch roads, guarantee the normal operation of transformer, avoided the generation of misoperation simultaneously yet; whole protective device circuit is simple, practical.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention will be further described in detail:
Fig. 1 is main circuit diagram of the present invention;
Fig. 2 is control circuit figure of the present invention.
Embodiment
As depicted in figs. 1 and 2; the utility model distribution transformer secondary overtemperature protection latching circuit; it is characterized in that: comprising: isolation reversing switch Q1; distribution transformer T1; circuit breaker DZ1, A.C. contactor CJ1, thermal relay RJ1, start button QA1, stop button TA1, fuse RT1, RT2, indicator light XHD1, XHD2, intermediate relay ZJ 1 and time relay sj 1, wherein:
The coil of A.C. contactor CJ1 is CJ1.1, and its main contacts is CJ1.2, and normally opened contact is CJ1.3, and normally-closed contact is CJ1.4;
The normally opened contact of thermal relay RJ1 is RJ1.1;
The coil of intermediate relay ZJ 1 is ZJ1.1, and normally-closed contact is ZJ1.2, and normally opened contact is ZJ1.3;
The coil of time relay sj 1 is SJ1.1, and its timing closing contact is SJ1.2;
The main circuit of described distribution transformer T1 is: after the end of incoming cables of described distribution transformer T1 serial connection isolation reversing switch Q1, be connected with high voltage source, the main contacts CJ1.2 that the leading-out terminal of described distribution transformer T1 is connected in series circuit breaker DZ1, A.C. contactor CJ1 successively with after thermal relay RJ1, be connected with low-tension supply output;
The control circuit structure of bis-overheating protection circuits of described distribution transformer T1 is: after the serial connection fuse RT1 of one end of described stop button TA1, be connected with control circuit positive source, the other end of stop button TA1 is connected with one end of start button QA1 successively and after connecing one end, one end of normally opened contact ZJ1.3 of intermediate relay ZJ 1 and one end of the normally-closed contact CJ1.4 of A.C. contactor CJ1 of timing closing contact SJ1.2 of one end, the time relay sj 1 of the normally opened contact CJ1.3 of A.C. contactor CJ1; The other end of described start button QA1 successively and connect behind one end of the other end, one end of indicator light XHD1 and the normally opened contact RJ1.1 of thermal relay RJ1 of the normally opened contact CJ1.3 of A.C. contactor CJ1 with one end of the coil CJ1.1 of A.C. contactor CJ1 and be connected;
The other end of the coil CJ1.1 of described A.C. contactor CJ1 is connected with one end of the normally-closed contact ZJ1.2 of intermediate relay ZJ 1, the other end of the normally opened contact RJ1.1 of described thermal relay RJ1 is connected with one end of the coil SJ1.1 of time relay sj 1, the other end of the timing closing contact SJ1.2 of described time relay sj 1 and connect the other end of normally opened contact ZJ1.3 of intermediate relay ZJ 1 after be connected with one end of the coil ZJ1.1 of intermediate relay ZJ 1, the other end of the normally-closed contact CJ1.4 of described A.C. contactor CJ1 is connected with one end of indicator light XHD2;
The other end of the normally-closed contact ZJ1.2 of described intermediate relay ZJ 1 is connected with one end of fuse RT2 successively and after connecing the other end of coil ZJ1.1 of the other end, intermediate relay ZJ 1 of the coil SJ1.1 of the other end, the time relay sj 1 of indicator light XHD1 and the other end of indicator light XHD2, and the other end of described fuse RT2 is connected with control circuit power cathode.
In the time pressing start button QA1, A.C. contactor CJ1 self-locking energising, coil CJ1.1 obtains electric, normally opened contact CJ1.3 adhesive, indicator light XHD1 is bright, and normally-closed contact CJ1.4 disconnects, and indicator light XHD2 goes out, main contacts CJ1.2 adhesive, main circuit energising operation; In the time pressing stop button TA1, A.C. contactor CJ1 vows electric tripping, coil CJ1.1 dead electricity, and normally opened contact CJ1.3 disconnects, and indicator light XHD1 goes out, normally-closed contact CJ1.4 closure, indicator light XHD2 is bright, and main contacts CJ1.2 disconnects, and main circuit power-off is out of service.
When secondary circuit is overheated while breaking down, the normally opened contact RJ1.1 closure of thermal relay RJ1, the coil SJ1.1 of time relay sj 1 obtains electric, reaches after delay time timing closing contact SJ1.2 closure, intermediate relay ZJ 1 adhesive self-locking, now coil ZJ1.1 continues electricly, and normally opened contact ZJ1.3 remains closed, and normally-closed contact ZJ1.2 disconnects, circuit is thoroughly cut off, and transformer is protected; If between time delay, it is normal that electric current recovers, and thermal relay RJ1 resets, and circuit can not be cut off but normally move work, has avoided the generation of misoperation.
Claims (1)
1. distribution transformer secondary overtemperature protection latching circuit; it is characterized in that: comprising: isolation reversing switch Q1; distribution transformer T1; circuit breaker DZ1, A.C. contactor CJ1, thermal relay RJ1, start button QA1, stop button TA1, fuse RT1, RT2, indicator light XHD1, XHD2, intermediate relay ZJ 1 and time relay sj 1, wherein:
The coil of A.C. contactor CJ1 is CJ1.1, and its main contacts is CJ1.2, and normally opened contact is CJ1.3, and normally-closed contact is CJ1.4;
The normally opened contact of thermal relay RJ1 is RJ1.1;
The coil of intermediate relay ZJ 1 is ZJ1.1, and normally-closed contact is ZJ1.2, and normally opened contact is ZJ1.3;
The coil of time relay sj 1 is SJ1.1, and its timing closing contact is SJ1.2;
The main circuit of described distribution transformer T1 is: after the end of incoming cables of described distribution transformer T1 serial connection isolation reversing switch Q1, be connected with high voltage source, the main contacts CJ1.2 that the leading-out terminal of described distribution transformer T1 is connected in series circuit breaker DZ1, A.C. contactor CJ1 successively with after thermal relay RJ1, be connected with low-tension supply output;
The control circuit structure of bis-overheating protection circuits of described distribution transformer T1 is: after the serial connection fuse RT1 of one end of described stop button TA1, be connected with control circuit positive source, the other end of stop button TA1 is connected with one end of start button QA1 successively and after connecing one end, one end of normally opened contact ZJ1.3 of intermediate relay ZJ 1 and one end of the normally-closed contact CJ1.4 of A.C. contactor CJ1 of timing closing contact SJ1.2 of one end, the time relay sj 1 of the normally opened contact CJ1.3 of A.C. contactor CJ1; The other end of described start button QA1 successively and connect behind one end of the other end, one end of indicator light XHD1 and the normally opened contact RJ1.1 of thermal relay RJ1 of the normally opened contact CJ1.3 of A.C. contactor CJ1 with one end of the coil CJ1.1 of A.C. contactor CJ1 and be connected;
The other end of the coil CJ1.1 of described A.C. contactor CJ1 is connected with one end of the normally-closed contact ZJ1.2 of intermediate relay ZJ 1, the other end of the normally opened contact RJ1.1 of described thermal relay RJ1 is connected with one end of the coil SJ1.1 of time relay sj 1, the other end of the timing closing contact SJ1.2 of described time relay sj 1 and connect the other end of normally opened contact ZJ1.3 of intermediate relay ZJ 1 after be connected with one end of the coil ZJ1.1 of intermediate relay ZJ 1, the other end of the normally-closed contact CJ1.4 of described A.C. contactor CJ1 is connected with one end of indicator light XHD2;
The other end of the normally-closed contact ZJ1.2 of described intermediate relay ZJ 1 is connected with one end of fuse RT2 successively and after connecing the other end of coil ZJ1.1 of the other end, intermediate relay ZJ 1 of the coil SJ1.1 of the other end, the time relay sj 1 of indicator light XHD1 and the other end of indicator light XHD2, and the other end of described fuse RT2 is connected with control circuit power cathode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320873494.5U CN203660503U (en) | 2013-12-28 | 2013-12-28 | Power distribution transformer secondary overheat protection self-locking circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320873494.5U CN203660503U (en) | 2013-12-28 | 2013-12-28 | Power distribution transformer secondary overheat protection self-locking circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203660503U true CN203660503U (en) | 2014-06-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320873494.5U Expired - Fee Related CN203660503U (en) | 2013-12-28 | 2013-12-28 | Power distribution transformer secondary overheat protection self-locking circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203660503U (en) |
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2013
- 2013-12-28 CN CN201320873494.5U patent/CN203660503U/en not_active Expired - Fee Related
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140618 Termination date: 20171228 |