CN203278708U - Novel F-C loop configuration circuit - Google Patents
Novel F-C loop configuration circuit Download PDFInfo
- Publication number
- CN203278708U CN203278708U CN 201320312975 CN201320312975U CN203278708U CN 203278708 U CN203278708 U CN 203278708U CN 201320312975 CN201320312975 CN 201320312975 CN 201320312975 U CN201320312975 U CN 201320312975U CN 203278708 U CN203278708 U CN 203278708U
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- loop
- fuse
- contactor
- grounding switch
- high speed
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Abstract
The utility model relates to the motor starting circuit field and provides a novel F-C loop configuration circuit which is used for starting a motor requiring frequent starting. Problems that a contactor of a conventional F-C loop possibly works prior to a fuse and as a result the service lifetime of the costly contactor is significantly shortened are solved. The novel F-C loop configuration circuit comprises a fuse, a contactor, a current transformer, a lightning arrester and a rapid grounding switch. One end of the fuse is connected with a power supply. The other end of the fuse is sequentially serially connected with the contactor, the current transformer and a motor. One end of the lightning arrester is grounded while the other end is connected on the current output end of the current transformer. One end of the rapid grounding switch is grounded while the other end is connected on the current output end of the current transformer. The equipment replacing and maintaining cost can be significantly lowered on the premise that the safety and the reliability of a power supply loop are unchanged. Furthermore, the F-C loop using range is widened.
Description
Technical field
The utility model relates to a kind of motor start circuit, especially relates to a kind of novel F-C loop configuration circuit.
Background technology
in engineering practice, (but used for vacuum contactor-fuse combined electric appliance is to utilize to cut-off on a large scale that the high-tension fuse of short circuit current coordinates with the vacuum contactor of frequent operation in the F-C loop, be applied to generating, petrochemical industry, the electric drive system of the industry such as metallurgy, starting device as the motor of Fraquent start, therefore be also referred to as combined starter, be called for short the F-C loop) generally be used for rated power less than or equal to 1000kW and start-up time short electric motor loop, and rated power is less than 630kW and long electric motor loop of starting time, vacuum circuit-breaker is adopted in other loop.Its reason is as follows:
To be used for rated power long greater than 630kW and starting time when the F-C loop, or rated power is during greater than the electric motor loop of 1000kW, and contactor and the action time of the fuse are more approaching, contactor may occur and have precedence over fuse and move.And because contactor is expensive, approximately 40,000 yuan of left and right are one, cut-off frequently arcing etc. and easily cause it to damage, and can cause the reduction greatly in contactor life-span; And the fuse low price, 200 to the 300 yuan of left and right of only having an appointment.Allowing fuse have precedence over contactor first moves and can protect contactor to avoid damaging.Therefore fuse with become very difficult coordinating of contactor, and this has also limited the scope of application in F-C loop.
Summary of the invention
The purpose of this utility model is: for the problem of prior art existence, providing a kind of can guarantee under the prerequisite that current supply circuit fail safe, reliability do not reduce, greatly reduce the expense of equipment replacement and maintenance, and enlarged the F-C loop configuration circuit of the scope of application in F-C loop.
The purpose of this utility model is achieved through the following technical solutions:
A kind of novel F-C loop configuration circuit, startup for the motor that needs frequent starting, it is characterized in that, this circuit comprises fuse, contactor, current transformer, lightning arrester and high speed grounding switch, one end of described fuse connects power supply, the other end of fuse is series contactor, current transformer and motor successively, one end ground connection of described lightning arrester, the other end of lightning arrester is connected to the current output terminal of current transformer, one end ground connection of described high speed grounding switch, the other end of high speed grounding switch is connected to the current output terminal of current transformer.
Preferably, described high speed grounding switch is that the switch motion time is less than the high speed grounding switch of 0.06s.
Preferably, described high speed grounding switch is the switch motion time less than the high speed grounding switch of relaying protection operate time of contactor.
Preferably, described configuration circuit also comprises be used to the cable that connects above-mentioned each components and parts, and this cable is that cross section is at 50mm
2~ 100 mm
2Between cable.
Compared with prior art, the utlity model has following advantage:
1, can greatly reduce the expense of equipment replacement and maintenance, and enlarge the scope of application in F-C loop, and because F-C circuit switching cabinet price is only 2/3 left and right in vacuum circuit-breaker loop, can greatly save the Medium Voltage Switchgear investment.
2, when adopting this F-C loop, the return cable smallest cross-sectional can adopt 50mm
2, and the smallest cross-sectional of vacuum circuit-breaker return cable is generally 120mm
2(short-circuit current level 40kA) and 185mm
2(short-circuit current level 50kA), therefore, after adopting alternative vacuum circuit-breaker loop, this F-C loop, corresponding cable type selecting can reduce the cross-section of cable, and cable investment also can reduce greatly.
3, adopt this novel F-C loop to arrange after, guaranteeing under the prerequisite that current supply circuit fail safe, reliability do not reduce, the economy of operation maintenance to be greatly improved.
Description of drawings
Fig. 1 is circuit diagram of the present utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is elaborated.
Embodiment
F-C loop configuration circuit is mainly used in needing the startup of the motor of frequent starting.As shown in Figure 1, the utility model is mainly to change the earthed switch in traditional F-C loop into high speed grounding switch, when the loop overcurrent occurs and needs the open failure loop, can adopt initiatively closed high speed grounding switch measure, the small short-circuit current that loop end short circuit or nonmetal character short circuit are caused becomes large short circuit current fast, and then cause the quick fuse of fuse, realize cut-offfing of fault loop.The utility model circuit comprises fuse 1, contactor 2, current transformer 3, lightning arrester 4 and high speed grounding switch 5.One end of fuse 1 connects power supply, can be arranged to power source head grafting form between fuse 1 and power supply; The other end of fuse 1 is series contactor 2, current transformer 3 and motor 4 successively, also can be arranged to power source head grafting form between contactor 2 summation current transformers 3.One end ground connection of lightning arrester 4, the other end of lightning arrester 4 is connected to the current output terminal of current transformer 3.One end ground connection of high speed grounding switch 5, the other end of high speed grounding switch 5 is connected to the current output terminal of current transformer 3.
Coordinating operate time; because general integrated protection is 0.06s without current quick operate time in time limit; contactor opening time is greater than 0.02s, and during large short circuit current the fusing time of fuse less than 0.02s, therefore the operate time of high speed grounding switch should be less than 0.06s.Therefore high speed grounding switch of the present utility model can select the switch motion time less than the high speed grounding switch of 0.06s, also can select the high speed grounding switch of switch motion time less than relaying protection operate time of contactor.
After adopting this circuit, can greatly reduce the expense of equipment replacement and maintenance.And enlarged the scope of application in F-C loop.Because F-C circuit switching cabinet price is only 2/3 left and right in vacuum circuit-breaker loop, can greatly save the Medium Voltage Switchgear investment.
In addition, when adopting the F-C loop, the return cable smallest cross-sectional can adopt 50mm
2, and the smallest cross-sectional of vacuum circuit-breaker return cable is generally 120mm
2(short-circuit current level 40kA) and 185mm
2(short-circuit current level 50kA).Therefore, after adopting alternative vacuum circuit-breaker loop, F-C loop, corresponding cable type selecting can reduce the cross-section of cable, and cable investment also can reduce greatly.
Moreover, after adopting this novel F-C loop to arrange, guaranteeing under the prerequisite that current supply circuit fail safe, reliability do not reduce, the economy of operation maintenance to be greatly improved.
The above is only preferred embodiment of the present utility model; not in order to limit the utility model; should be pointed out that all any modifications of doing within spirit of the present utility model and principle, be equal to replacement and improvement etc., within all should being included in protection range of the present utility model.
Claims (4)
1. novel F-C loop configuration circuit, startup for the motor that needs frequent starting, it is characterized in that, this circuit comprises fuse, contactor, current transformer, lightning arrester and high speed grounding switch, one end of described fuse connects power supply, the other end of fuse is series contactor successively, current transformer and motor, one end ground connection of described lightning arrester, the other end of lightning arrester is connected to the current output terminal of current transformer, one end ground connection of described high speed grounding switch, the other end of high speed grounding switch is connected to the current output terminal of current transformer.
2. a kind of novel F-C loop configuration circuit according to claim 1, is characterized in that, described high speed grounding switch is that the switch motion time is less than the high speed grounding switch of 0.06s.
3. a kind of novel F-C loop configuration circuit according to claim 1, is characterized in that, described high speed grounding switch is the switch motion time less than the high speed grounding switch of relaying protection operate time of contactor.
4. a kind of novel F-C loop configuration circuit according to claim 1, is characterized in that, described configuration circuit also comprises be used to the cable that connects above-mentioned each components and parts, and this cable is that cross section is at 50mm
2~ 100 mm
2Between cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320312975 CN203278708U (en) | 2013-05-31 | 2013-05-31 | Novel F-C loop configuration circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320312975 CN203278708U (en) | 2013-05-31 | 2013-05-31 | Novel F-C loop configuration circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203278708U true CN203278708U (en) | 2013-11-06 |
Family
ID=49509031
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320312975 Withdrawn - After Issue CN203278708U (en) | 2013-05-31 | 2013-05-31 | Novel F-C loop configuration circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203278708U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103281015A (en) * | 2013-05-31 | 2013-09-04 | 中国电力工程顾问集团西南电力设计院 | Novel F-C loop configuration circuit |
-
2013
- 2013-05-31 CN CN 201320312975 patent/CN203278708U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103281015A (en) * | 2013-05-31 | 2013-09-04 | 中国电力工程顾问集团西南电力设计院 | Novel F-C loop configuration circuit |
| CN103281015B (en) * | 2013-05-31 | 2015-09-30 | 中国电力工程顾问集团西南电力设计院有限公司 | A kind of novel F-C loop configuration circuit |
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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 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20131106 Effective date of abandoning: 20150930 |
|
| RGAV | Abandon patent right to avoid regrant |