CN203911456U - Contactor tripping preventing loop equipped with motor protector - Google Patents
Contactor tripping preventing loop equipped with motor protector Download PDFInfo
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- CN203911456U CN203911456U CN201420331485.8U CN201420331485U CN203911456U CN 203911456 U CN203911456 U CN 203911456U CN 201420331485 U CN201420331485 U CN 201420331485U CN 203911456 U CN203911456 U CN 203911456U
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- contactor
- auxiliary relay
- motor protector
- live wire
- contact
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Abstract
The utility model provides a contactor tripping preventing loop equipped with a motor protector. The contactor tripping preventing loop comprises a live line, a zero line, a closing button and a tripping button on a switch cabinet, a closing control intermediate relay, a tripping control intermediate relay, a repeat intermediate relay, a latching intermediate relay, a motor protector and a contactor. The tripping preventing loop is designed for contactor driving wiring based on electronic-type performance characteristics of the motor protector, and therefore the problem repeat closing and tripping of the contactor is solved reliably.
Description
Technical field
The invention belongs to distribution technique field, proposed a kind of contactor anti-jump loop that configures motor protector.
Background technology
In generation current factory, low-tension motor generally adopts integrated protector for electric motor (also claiming motor protector, hereinafter to be referred as motor protector) to substitute thermal relay or current relay in the past.But because motor is combined guarantor for electronic component, operate time and return time are very fast, there will be the jump problem of contactor in practical implementation.Be illustrated in figure 1 the breaker tripping and closing control loop mode of connection of motor of the prior art, in figure, L is live wire, and N is zero line; S01 is distant place diverter switch on the spot; S02, S03 are respectively switch knob, the trip button on switch cubicle; K01 is for controlling combined floodgate auxiliary relay, and K02 is that control tripping operation auxiliary relay, F01 are motor protector, and Q02 is contactor.
This mode of connection exists control hidden danger as follows: if low voltage motor or cable loop itself exist fault (ground connection or short circuit), when starting, after contactor Q02 combined floodgate starter motor, motor protector protection action tripping contactor Q02, but protection action connection point is fast return contact, after contactor Q02 separating brake, protect action connection point to return immediately, closing time t1 due to contactor Q02, opening time t2 is no more than 35ms, protection contact return time t3 is no more than 40ms, and DCS closing pulse width is generally 2s, therefore after protection action connection point returns, DCS closing pulse starts again controls combined floodgate auxiliary relay K01, that causes contactor Q02 closes jumping repeatedly, easily cause the impact damage to motor and contactor Q02.
Summary of the invention
For addressing the above problem; the utility model provides a kind of contactor anti-jump loop that configures motor protector, comprises switch knob, trip button, control combined floodgate auxiliary relay, control tripping operation auxiliary relay, heavily moving auxiliary relay, locking type auxiliary relay, motor protector, contactor on live wire, zero line, switch cubicle;
Switch knob on described switch cubicle, trip button are connected with live wire respectively; motor protector is connected between live wire and zero line after connecting with the coil of heavily moving auxiliary relay; locking type auxiliary relay coil one end is connected with zero line; the other end is connected with one end, contact of heavily moving auxiliary relay, and the other end of heavily moving auxiliary relay contact is connected with live wire;
It is in parallel with the closing contact of motor protection again after the auxiliary normally opened contact two ends of contactor are in parallel with the heavily moving normally opened contact of control combined floodgate auxiliary relay two ends; the parallel connection point of one side connects live wire, and the parallel connection point of opposite side trips auxiliary relay, the normally-closed contact of locking type auxiliary relay, the drive coil of contactor is connected to zero line after connecting with control.The power supply of locking type auxiliary relay is taken from live wire and zero line.
The beneficial effects of the utility model are:
In electric power, chemical industry, industrial enterprise, on off control is substantially all carried out by contactor in low-tension motor loop, and much all adopts electronic motor protector protection at present.With a 2X600MW level power plant, calculate, low-tension motor contactor and the protector of configuration all reach more than 300 separately.The application considering on the basis of motor protector electronic type operating characteristics, is the contactor anti-jump loop that driven wiring design, thereby prevented reliably the jumping problem of repeatedly closing of contactor.Adopt after the application's anti-jump loop, when there is fault in motor or its cable loop, the contactor that can reliably avoid operations staff's false switching to cause closes jumping repeatedly, and the repeatedly rush of current infringement to motor and contactor, can effectively extend the useful life of motor and contactor, save the operation and maintenance cost of power plant.
Accompanying drawing explanation
Fig. 1 is the breaker tripping and closing control loop mode of connection schematic diagram of motor of the prior art.
Fig. 2 is breaker tripping and closing control loop mode of connection schematic diagram of the present utility model.
Embodiment
The problem that the utility model exists for prior art, provides a kind of novel contactor to control connection circuit, avoids the jumping problem of repeatedly closing of contactor.
Fig. 2 is schematic diagram of the present utility model.In figure, L is live wire, and N is zero line, and S02, S03 are respectively combined floodgate, the trip button on switch cubicle; K01 is for controlling combined floodgate auxiliary relay, and K02 is for controlling tripping operation auxiliary relay, the K03 moving auxiliary relay of attaching most importance to, and K04 is locking type auxiliary relay, and F01 is motor protector, and Q02 is contactor.
Switch knob S02, trip button S03 on described switch cubicle are connected with live wire respectively; motor protector F01 is connected between live wire and zero line after connecting with the coil of heavily moving auxiliary relay K03; locking type auxiliary relay K04 coil one end is connected with zero line N; the other end is connected with one end, contact of heavily moving auxiliary relay K03; the other end of heavily moving auxiliary relay K03 contact is connected with live wire L, and the power supply of K04 is taken from live wire L and zero line N.
It is in parallel with the closing contact of motor protection F01 again after the auxiliary normally opened contact two ends of contactor Q02 are in parallel with the heavily moving normally opened contact of control combined floodgate auxiliary relay K01 two ends; the parallel connection point of one side connects live wire, the parallel connection point of opposite side with the normally-closed contact of K02, K04, the drive coil of Q02 is connected to zero line after connecting.
The principle of the technical program is: (from left to right each loop)
1. left side is combined floodgate/trip command of being come by a distant place (DCS/PLC or button) with the combined floodgate/trip button on switch cabinet drawer (S02/S03) through distant place startup combined floodgate/tripping relay (K01/K02) after the switching of diverter switch S01 on the spot.
2. in the middle of, be to protect heavily moving loop: under normal condition, motor protector F01 protection is failure to actuate, and F01 normally-closed contact remains closed, thereby causes K03 relay to keep action, and the normally-closed contact of K03 remains open, and does not start K04 relay.When F01 protection action, the normally-closed contact of F01 disconnects, and K03 relay returns, and the normally-closed contact of K03 relay is closed, starts locking type relay F04, and the working power of F04 relay is taken from live wire L and zero line N simultaneously.The Main Function of K03 relay is that the protection action connection point of motor protector is converted to normally opened contact by normally-closed contact, thereby starts K04 blocking relay.(therefore, when motor protector F01 itself can provide the protection action contact of often opening, also can cancel K03 relay, directly the protection action normally opened contact by F01 starts K04 relay.) K04 blocking relay is the emphasis in this loop, heavily moving by K04 relay, can obtain remaining after motor protector F01 protection action the K04 contact (involution manually) of action.
3. right side is the driving loop of contactor Q02: when receiving reclosing command, K01 relay normally open contact is closed, starting contactor Q02 coil closes a floodgate, then the auxiliary normally opened contact of Q02 is closed, this contact is in parallel with K01 contact, form the self-holding circuit of Q02 contactor, the closing contact of F01 is used when motor decompression restarts.When receiving trip command, drive the K02 relay normally-closed contact being connected in series on loop to disconnect, thereby disconnect Q02 coil power, contactor tripping operation, the auxiliary normally opened contact of Q02 simultaneously in parallel with K01 returns to disconnection, removes the self-holding circuit of Q02 contactor.And when motor protector F01 when action protection, K04 relay normally-closed contact remains open for a long time, thereby disconnects for a long time Q02 coil power, contactor keeps tripped condition, and can not be subject to the impact of closing pulse, and that can not cause contactor closes jumping repeatedly.
The beneficial effects of the utility model are:
In electric power, chemical industry, industrial enterprise, on off control is substantially all carried out by contactor in low-tension motor loop, and much all adopts electronic motor protector protection at present.With a 2X600MW level power plant, calculate, low-tension motor contactor and the protector of configuration all reach more than 300 separately.The application considering on the basis of motor protector electronic type operating characteristics, is the contactor anti-jump loop that driven wiring design, thereby prevented reliably the jumping problem of repeatedly closing of contactor.Adopt after the application's anti-jump loop, when there is fault in motor or its cable loop, the contactor that can reliably avoid operations staff's false switching to cause closes jumping repeatedly, and the repeatedly rush of current infringement to motor and contactor, can effectively extend the useful life of motor and contactor, save the operation and maintenance cost of power plant.
Claims (2)
1. a contactor anti-jump loop that configures motor protector; it is characterized in that, comprise switch knob, trip button, control combined floodgate auxiliary relay, control tripping operation auxiliary relay, heavily moving auxiliary relay, locking type auxiliary relay, motor protector, contactor on live wire, zero line, switch cubicle;
Switch knob on described switch cubicle, trip button are connected with live wire respectively; motor protector is connected between live wire and zero line after connecting with the coil of heavily moving auxiliary relay; locking type auxiliary relay coil one end is connected with zero line; the other end is connected with one end, contact of heavily moving auxiliary relay, and the other end of heavily moving auxiliary relay contact is connected with live wire;
It is in parallel with the closing contact of motor protection again after the auxiliary normally opened contact two ends of contactor are in parallel with the heavily moving normally opened contact of control combined floodgate auxiliary relay two ends; the parallel connection point of one side connects live wire, and the parallel connection point of opposite side trips auxiliary relay, the normally-closed contact of locking type auxiliary relay, the drive coil of contactor is connected to zero line after connecting with control.
2. the contactor anti-jump loop of configuration motor protector as claimed in claim 1, is characterized in that, the power supply of locking type auxiliary relay is taken from live wire and zero line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420331485.8U CN203911456U (en) | 2014-06-20 | 2014-06-20 | Contactor tripping preventing loop equipped with motor protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420331485.8U CN203911456U (en) | 2014-06-20 | 2014-06-20 | Contactor tripping preventing loop equipped with motor protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203911456U true CN203911456U (en) | 2014-10-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420331485.8U Active CN203911456U (en) | 2014-06-20 | 2014-06-20 | Contactor tripping preventing loop equipped with motor protector |
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| Country | Link |
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| CN (1) | CN203911456U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107181238A (en) * | 2017-07-18 | 2017-09-19 | 攀钢集团西昌钢钒有限公司 | Distribution system high-voltage motor control loop |
-
2014
- 2014-06-20 CN CN201420331485.8U patent/CN203911456U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107181238A (en) * | 2017-07-18 | 2017-09-19 | 攀钢集团西昌钢钒有限公司 | Distribution system high-voltage motor control loop |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: CHINA POWER ENGINEERING CONSULTING GROUP SOUTHWEST Free format text: FORMER NAME: SOUTHWEST ELECTRIC POWER DESIGN INSTITUTE OF CHINA POWER ENGINEERING CONSULTING GROUP CORPORATION |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 610021 Dongfeng Road, Chengdu, Sichuan, No. 18, No. Patentee after: China Power Engineering Consulting Group Southwest Electric Power Design Institute Co., Ltd. Address before: 610021 Dongfeng Road, Chengdu, Sichuan, No. 18, No. Patentee before: Southwest Electric Power Design Institute of China Power Engineering Consulting Group Corporation |