CN2409696Y - Phase interruption protecting switch for three-phase electric machine - Google Patents
Phase interruption protecting switch for three-phase electric machine Download PDFInfo
- Publication number
- CN2409696Y CN2409696Y CN 99249864 CN99249864U CN2409696Y CN 2409696 Y CN2409696 Y CN 2409696Y CN 99249864 CN99249864 CN 99249864 CN 99249864 U CN99249864 U CN 99249864U CN 2409696 Y CN2409696 Y CN 2409696Y
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- circuit
- transistor
- phase
- switch
- electric machine
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- Expired - Fee Related
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Abstract
The utility model relates to an open-phase protection switch for a three-phase electric machine, which comprises an air switch and a circuit control board of a transistor, wherein, the circuit control board of the transistor is formed by the serial connection of a rectification circuit, an amplification circuit and a transformer signal input circuit. A trip is added on the air switch and is controlled by the circuit board of the transistor. The utility model has the advantages of convenient installation, simple operation, low cost and low power consumption. In addition, the utility model can be directly matched with a switch.
Description
The utility model relates to a kind of protective device of motor, is specifically related to a kind of threephase motor phase-interruption protection switch.
Threephase motor is the main dynamics equipment in the industrial and agricultural production field always, during the three phase electric machine phase shortage, will burn out motor reaches to damaging production equipment, severe patient can cause great human casualty accident, according to statistics, three phase electric machine and because of lack (breaking) burn out mutually account for that motor burns out 85%, for the protection motor burns out mutually because of lacking (breaking), generally adopt various phase failure protectors at present, but existing protector can not be with the supporting use of switch must with the supporting use of contactor, thereby have following problem: 1, need have the people of professional electrician's knowledge to install; 2, increased the cost of contactor button; 3, increased power consumption (general contactor coil power consumption reaches tens watts).
The purpose of this utility model aim to provide a kind of install simple, easy to operate, with low cost, can be directly and the supporting use of switch, three phase electric machine phase-interruption protection switch that power consumption is low.
The utility model is to realize like this; this three phase electric machine phase-interruption protection switch has air switch and transistor circuit control board; the transistor circuit plate is by rectification circuit; amplifying circuit; the transducer signal input circuit is in series; on air switch, add a release; and controlled by the transistor circuit plate; in the amplifying circuit on the transistor circuit plate; be in series with release on the collector electrode of triode amplifier; rectification circuit is supplied with the amplifying circuit working power; the transducer signal input circuit is by three transistorized collector electrodes; emitter composes in series successively, and three transistorized base stages connect the instrument transformer of three phase mains respectively.
The utility model protection switch is compared with existing protector, and protector and switch are integrated, and utilizes the direct control switch of protector principle, circuit board is dwindled being installed in switch inside, can directly use, and the people that can connect knife switch can directly use.Thereby the utility model is installed simple, easy to operate, with low cost and conservation of power (power consumption of this switch is no more than 2 watts).
Further specify the utility model below in conjunction with accompanying drawing.
Fig. 1 is circuit theory diagrams of the present utility model.
Referring to Fig. 1; this three phase electric machine phase-interruption protection switch has air switch and transistor circuit control board; add a release on air switch, and controlled by the transistor circuit plate, the transistor circuit plate comprises rectification circuit, transistor amplifier circuit and mutual inductance signal input circuit.Rectification circuit is made up of four diode D1, D2, D3, D4, supplies with the transistor amplifier circuit working power; The tripping coil of release is serially connected in the collector loop of amplifier BG of transistor amplifier circuit, is connected on the base stage of BG after resistance R 2 and the capacitor C parallel connection; Input circuit is composed in series successively by three transistor BG1, BG2, the collector electrode of BG3, emitter, and the base stage of three transistor BG1, BG2, BG3 connects instrument transformer L1, L2, the L3 of three phase mains respectively, the collector electrode of BG1 is connected on the base stage of BG, and the transmitter of BG3 is connected on the emitter of BG.The continuous phase time of motor circuit, electronic circuit be to tripping coil power supply, and during the circuit generation phase failure, current signal makes BG1, BG2, BG3 turn-off with circuit, and switching tube BG conducting electric current flows through tripping coil J makes the release action, the shutoff motor circuit.Behind manual closing operation, motor power supply running, circuit board energising work simultaneously; When the arbitrary place of certain circuitry phase disconnects; provide the broken phase current signal by threephase current transformer, after processing and amplifying, provide a positively biased signal to make tripping coil produce electric current, the action of release adhesive trip gear to switching tube BG base stage; disconnect the motor power supply circuits, play the effect of protection motor.
Claims (1)
1; a kind of three phase electric machine phase-interruption protection switch; comprise air switch and transistor circuit control board; it is characterized in that: the transistor circuit control board is by rectification circuit; amplifying circuit and transducer signal input circuit are in series; on air switch, add a release J; and controlled by the transistor circuit plate; in the amplifying circuit on the transistor circuit plate; be in series with release J on the collector electrode of triode amplifier BG; rectification circuit is supplied with the amplifying circuit working power; the transducer signal input circuit is by three transistor BG1; BG2; the collector electrode of BG3; emitter composes in series successively, and three transistor BG1; BG2; the base stage of BG3 connects the instrument transformer L1 of three phase mains respectively; L2; L3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99249864 CN2409696Y (en) | 1999-12-07 | 1999-12-07 | Phase interruption protecting switch for three-phase electric machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99249864 CN2409696Y (en) | 1999-12-07 | 1999-12-07 | Phase interruption protecting switch for three-phase electric machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2409696Y true CN2409696Y (en) | 2000-12-06 |
Family
ID=34034762
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99249864 Expired - Fee Related CN2409696Y (en) | 1999-12-07 | 1999-12-07 | Phase interruption protecting switch for three-phase electric machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2409696Y (en) |
-
1999
- 1999-12-07 CN CN 99249864 patent/CN2409696Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C57 | Notification of unclear or unknown address | ||
| DD01 | Delivery of document by public notice |
Addressee: Jiang Rongyue Document name: Notice of termination |
|
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |