CN102868140A - Overload alarming device for power transformer - Google Patents
Overload alarming device for power transformer Download PDFInfo
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- CN102868140A CN102868140A CN2012103290702A CN201210329070A CN102868140A CN 102868140 A CN102868140 A CN 102868140A CN 2012103290702 A CN2012103290702 A CN 2012103290702A CN 201210329070 A CN201210329070 A CN 201210329070A CN 102868140 A CN102868140 A CN 102868140A
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Abstract
The invention provides an overload alarming device for a power transformer, belonging to the technical field of a transformer protecting device. The overload alarming device comprises a mini-type breaker QF, an operation signal lamp HL1, current mutual inductors TAa, TAb and TAc, a current alarming meter P, time relays KT1 and KT2, intermediate relays KA1 and KA2, a test button SB1, a resetting button SB2, a locking signal lamp HL2, an alarming lamp HA and an electric bell DL. Three-phase current signals are detected by the current mutual inductors TAa, TAb and TAc, and the triggering signals are sent to the relays to control the circuit to work through the current alarming meter P. In the design scheme, the time relay and the intermediate relay are matched to use, so that the overload alarming device capable of carrying out overload protection on the power transformer and real-time alarming can be realized. The overload alarming device provided by the invention has the advantages of simple and reasonable design, reliable motion and convenience in use; and the use security of the power transformer is greatly improved.
Description
Technical field
The invention belongs to the protection equipment for transformer technical field, be specifically related to a kind of power transformer apparatus for warning overload
Background technology
At present, the damage of power transformer mostly is the long term overloading operation and causes, and transformer overload mainly is to consider the transformer heat radiation.When load current surpasses rated current, the transformer coil heating, internal temperature rises.Because power transformer allows the short-time overload operation, so transformer self there is no the overload protection measure, usually can carry out for a long time overlond running.Long-term overlond running will make transformer and distribution line be in for a long time temperature rising state, so the contact of conductor, terminal all can sustain damage, and the line insulation level reduces, accelerated ageing and affect useful life.If long-time serious overload operation, the temperature of transformer and distribution line thereof can sharply raise, line insulation is softening to be disintegrated, thereby cause short circuit, cause that circuit breaker burns, transformer burns, electrical fire and other harm, bring potential safety hazard for people's life, bring about great losses for people's property.Along with electric modern propelling, newly-increased power consumer is more and more, at the routine use of electric power with in safeguarding, transformer often occurs because of user's overlond running reduction of service life or the event of initiation fire seriously.
For this reason, can provide that a kind of power transformer is carried out overload protection and the apparatus for warning overload of reporting to the police in real time is that industry remains urgent problem
Summary of the invention
The object of the present invention is to provide a kind of circuit design advantages of simple, reliable in action, easy to use, can effectively prevent the operation of transformer long term overloading, improved the power transformer apparatus for warning overload of safety in utilization.
The objective of the invention is to reach like this, a kind of power transformer apparatus for warning overload, comprise miniature circuit breaker QF, run signal lamp HL1, current transformer TAa, TAb, TAc, electric current alarm meter P, time relay KT1, KT2, auxiliary relay KA1, KA2, test button SB1, reset button SB2, block signal lamp HL2, alarm lamp HA and electric bell DL, the L end that two inputs of miniature circuit breaker QF get access to grid respectively and N end, the end of the output of miniature circuit breaker QF and run signal lamp HL1,1 pin of electric current alarm meter P, 36 pin, the end of test button SB1, the end of often opening the timing closing contact of time relay KT1, one end of the normally-closed contact of reset button SB2, one end of one end of the normally opened contact of auxiliary relay KA1 and the first normally opened contact of auxiliary relay KA2 connects, the other end of another output of miniature circuit breaker QF and run signal lamp HL1,2 pin of electric current alarm meter P, one end of the coil of time relay KT1, one end of the coil of auxiliary relay KA1, one end of the coil of time relay KT2, one end of the coil of auxiliary relay KA2, the end of block signal lamp HL2, the end of alarm lamp HA and the end of electric bell DL connect, 4 pin of electric current alarm meter P, 6 pin, 8 pin respectively with the S1 pin of current transformer TAa, the S1 pin of current transformer TAb and the S1 pin of current transformer TAc connect, 37 pin of electric current alarm meter P connect the other end of the coil of time relay KT1, the other end of often opening the timing closing contact of the other end of test button SB1 and time relay KT1, the other end of the coil of the other end of the coil of auxiliary relay KA1 and time relay KT2 connects, one end of the end of often opening the timing closing contact of another termination time relay KT2 of the normally-closed contact of reset button SB2 and the second normally opened contact of auxiliary relay KA2, the other end of the other end of often opening the timing closing contact of time relay KT2 and the second normally opened contact of auxiliary relay KA2, the other end of the other end of the coil of auxiliary relay KA2 and block signal lamp HL2 connects, the other end of the first normally opened contact of the other end of the normally opened contact of auxiliary relay KA1 and auxiliary relay KA2, the other end of the other end of warning light HA and electric bell DL connects, the external load loop circuit breaker of the 3rd normally opened contact of auxiliary relay KA2, the S2 pin of current transformer TAa, the S2 pin of current transformer TAb, 5 pin of the S2 pin of current transformer TAc and electric current alarm meter P, 7 pin, 9 pin common grounds.
The present invention is owing to adopted said structure; detect three-phase current signal by current transformer TAa, TAb, TAc; and by electric current alarm meter P triggering signal is sent to relay with control circuit work; in present design; the time relay and auxiliary relay are used, and have realized a apparatus for warning overload that can carry out to power transformer overload protection and energy Realtime Alerts.This installs, and simplicity of design is reasonable, reliable in action, easy to use, has greatly improved the safety in utilization of power transformer.
Description of drawings
Fig. 1 is electrical schematic diagram of the present invention.
Embodiment
In order to make the public can fully understand technical spirit of the present invention and beneficial effect; the applicant will describe in detail the specific embodiment of the present invention below by reference to the accompanying drawings; but the applicant is not restriction to technical scheme to the description of embodiment, anyly makes form and immaterial variation all should be considered as protection scope of the present invention according to the present invention's design.
See also Fig. 1, a kind of power transformer apparatus for warning overload comprises miniature circuit breaker QF, run signal lamp HL1, current transformer TAa, TAb, TAc, electric current alarm meter P, time relay KT1, KT2, auxiliary relay KA1, KA2, test button SB1, reset button SB2, block signal lamp HL2, alarm lamp HA and electric bell DL.In the present embodiment, described miniature circuit breaker QF adopts the C65N miniature circuit breaker of French Schneider company; Electric current alarm meter P adopts the PZ series of Shanghai Acrel Electric Co., Ltd. to exchange detecting instrument; Time relay KT1, KT2 and auxiliary relay KA1, KA2 adopt the Omron product.Alarm signal adopts alarm lamp flicker and electric bell sound double-reminding mode.
The present invention adopts relay control circuit to realize the automatic protection warning function of power transformer overload; installing three current transformer TAa, Tab, TAc in the total cabinet of the distribution of step down side; be used for respectively three-phase current Ia, Ib, the Ic of measuring transformer electricity consumption total load; these three current signal Ia, Ib, Ic access electric current alarm meter P, P compares predetermined current and measured current by the electric current alarm meter.When any phase current is greater than set point (scope of setting is 1.05 times of transformer rated current) among the three-phase current Ia, the Ib that survey, the Ic, the action of electric current alarm meter P output contact, the coil electricity of time relay KT1.When time of current overload arranges scope and is 5～10s) greater than the delay time t1(of time relay KT1, time relay KT1 often opens the timing closing closing of contact, the coil electricity of time relay KT2 also begins timing, the coil electricity of auxiliary relay KA1.At this moment, the normally opened contact of auxiliary relay KA1 is closed, and alarm lamp HA lights, and electric bell DL sounds, and is the overload advance notice and reports to the police; When the transformer overload electric current continues, and when overload time arranges scope and is 1～3min) greater than the delay time t2(of time relay KT2, time relay KT2 often opens the timing closing of retarded closing contact, auxiliary relay KA2 coil electricity, locking indicator light HL2 lights, carry out overload-alarm, the first normally opened contact of auxiliary relay KA2 and the second normally opened contact are closed.The 3rd normally opened contact of auxiliary relay KA2 is closed simultaneously, and the shunt opening coil F of load loop circuit breaker gets electric, and circuit breaker trip descends the total load of transformer.In this process, alarm lamp HA and electric bell DL continuous firing, thus reminding user transformer this moment is in the overlond running state, should be noted that the power load of transformer.Behind this device actuation of an alarm, need the staff manually to press reset button SB2, could again devote oneself to work after the warning of releasing alarm lamp HA and electric bell DL.Among the figure, run indicator HL1 is used to indicate whether normal power-up of described apparatus for warning overload, and miniature circuit breaker QF closure is namely lighted.In addition, in the electric current alarm meter P situation that output contact does not move, can also simulate the working condition of described apparatus for warning overload by pressing test button SB1, can detect it work.
In sum, technical scheme provided by the invention has overcome the shortcoming in the prior art, has reached goal of the invention, has embodied the described technique effect of applicant
Claims (1)
1.
A kind of power transformer apparatus for warning overload, it is characterized in that comprising miniature circuit breaker QF, run signal lamp HL1, current transformer TAa, TAb, TAc, electric current alarm meter P, time relay KT1, KT2, auxiliary relay KA1, KA2, test button SB1, reset button SB2, block signal lamp HL2, alarm lamp HA and electric bell DL, the L end that two inputs of miniature circuit breaker QF get access to grid respectively and N end, the end of the output of miniature circuit breaker QF and run signal lamp HL1,1 pin of electric current alarm meter P, 36 pin, the end of test button SB1, the end of often opening the timing closing contact of time relay KT1, one end of the normally-closed contact of reset button SB2, one end of one end of the normally opened contact of auxiliary relay KA1 and the first normally opened contact of auxiliary relay KA2 connects, the other end of another output of miniature circuit breaker QF and run signal lamp HL1,2 pin of electric current alarm meter P, one end of the coil of time relay KT1, one end of the coil of auxiliary relay KA1, one end of the coil of time relay KT2, one end of the coil of auxiliary relay KA2, the end of block signal lamp HL2, the end of alarm lamp HA and the end of electric bell DL connect, 4 pin of electric current alarm meter P, 6 pin, 8 pin respectively with the S1 pin of current transformer TAa, the S1 pin of current transformer TAb and the S1 pin of current transformer TAc connect, 37 pin of electric current alarm meter P connect the other end of the coil of time relay KT1, the other end of often opening the timing closing contact of the other end of test button SB1 and time relay KT1, the other end of the coil of the other end of the coil of auxiliary relay KA1 and time relay KT2 connects, one end of the end of often opening the timing closing contact of another termination time relay KT2 of the normally-closed contact of reset button SB2 and the second normally opened contact of auxiliary relay KA2, the other end of the other end of often opening the timing closing contact of time relay KT2 and the second normally opened contact of auxiliary relay KA2, the other end of the other end of the coil of auxiliary relay KA2 and block signal lamp HL2 connects, the other end of the first normally opened contact of the other end of the normally opened contact of auxiliary relay KA1 and auxiliary relay KA2, the other end of the other end of warning light HA and electric bell DL connects, the external load loop circuit breaker of the 3rd normally opened contact of auxiliary relay KA2, the S2 pin of current transformer TAa, the S2 pin of current transformer TAb, 5 pin of the S2 pin of current transformer TAc and electric current alarm meter P, 7 pin, 9 pin common grounds
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103290702A CN102868140A (en) | 2012-09-07 | 2012-09-07 | Overload alarming device for power transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103290702A CN102868140A (en) | 2012-09-07 | 2012-09-07 | Overload alarming device for power transformer |
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| CN102868140A true CN102868140A (en) | 2013-01-09 |
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| CN2012103290702A Pending CN102868140A (en) | 2012-09-07 | 2012-09-07 | Overload alarming device for power transformer |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103235229A (en) * | 2013-04-02 | 2013-08-07 | 国家电网公司 | High-voltage indoor line grounding alarming device |
| CN106229944A (en) * | 2016-08-02 | 2016-12-14 | 浙江华采科技有限公司 | A kind of earthed voltage transformer exciting current protection device |
| CN107884665A (en) * | 2017-11-28 | 2018-04-06 | 中国大唐集团科学技术研究院有限公司西北分公司 | Prevent the device and method of generator outlet voltage transformer turn-to-turn short circuit false tripping machine |
| CN112837516A (en) * | 2021-02-01 | 2021-05-25 | 临涣焦化股份有限公司 | Parking unloading alarm system for over-temperature wind bag |
Citations (5)
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| US4276605A (en) * | 1978-04-18 | 1981-06-30 | Tokyo Shibaura Denki Kabushiki Kaisha | Method and apparatus for supervising a digital protective relaying system |
| CN201054495Y (en) * | 2007-04-24 | 2008-04-30 | 华北电力大学 | Online monitoring and over-current limit device for power transformer iron core ground current |
| CN201541220U (en) * | 2009-12-04 | 2010-08-04 | 河南省电力公司许昌供电公司 | Electric motor Y-delta starting equipment |
| CN201608512U (en) * | 2009-12-30 | 2010-10-13 | 中国神华能源股份有限公司 | Device for protecting shift operation of frequency converter |
| CN202759216U (en) * | 2012-09-07 | 2013-02-27 | 常熟市森源电气科技有限公司 | Overload alarm device for power transformer |
-
2012
- 2012-09-07 CN CN2012103290702A patent/CN102868140A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4276605A (en) * | 1978-04-18 | 1981-06-30 | Tokyo Shibaura Denki Kabushiki Kaisha | Method and apparatus for supervising a digital protective relaying system |
| CN201054495Y (en) * | 2007-04-24 | 2008-04-30 | 华北电力大学 | Online monitoring and over-current limit device for power transformer iron core ground current |
| CN201541220U (en) * | 2009-12-04 | 2010-08-04 | 河南省电力公司许昌供电公司 | Electric motor Y-delta starting equipment |
| CN201608512U (en) * | 2009-12-30 | 2010-10-13 | 中国神华能源股份有限公司 | Device for protecting shift operation of frequency converter |
| CN202759216U (en) * | 2012-09-07 | 2013-02-27 | 常熟市森源电气科技有限公司 | Overload alarm device for power transformer |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103235229A (en) * | 2013-04-02 | 2013-08-07 | 国家电网公司 | High-voltage indoor line grounding alarming device |
| CN106229944A (en) * | 2016-08-02 | 2016-12-14 | 浙江华采科技有限公司 | A kind of earthed voltage transformer exciting current protection device |
| CN106229944B (en) * | 2016-08-02 | 2018-11-27 | 浙江华采科技有限公司 | A kind of earthed voltage transformer exciting current protective device |
| CN107884665A (en) * | 2017-11-28 | 2018-04-06 | 中国大唐集团科学技术研究院有限公司西北分公司 | Prevent the device and method of generator outlet voltage transformer turn-to-turn short circuit false tripping machine |
| CN107884665B (en) * | 2017-11-28 | 2024-03-08 | 大唐西北(西安)电力试验研究院有限公司 | Device and method for preventing turn-to-turn short circuit of generator outlet voltage transformer from mistakenly tripping |
| CN112837516A (en) * | 2021-02-01 | 2021-05-25 | 临涣焦化股份有限公司 | Parking unloading alarm system for over-temperature wind bag |
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Application publication date: 20130109 |