CN2726195Y - Three-phase electric machine switch apparatus with short phase and over voltage protecting function - Google Patents
Three-phase electric machine switch apparatus with short phase and over voltage protecting function Download PDFInfo
- Publication number
- CN2726195Y CN2726195Y CN 200420061169 CN200420061169U CN2726195Y CN 2726195 Y CN2726195 Y CN 2726195Y CN 200420061169 CN200420061169 CN 200420061169 CN 200420061169 U CN200420061169 U CN 200420061169U CN 2726195 Y CN2726195 Y CN 2726195Y
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- China
- Prior art keywords
- phase
- electric machine
- contactor
- line
- binding post
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- Expired - Fee Related
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Abstract
The utility model discloses a three-phase electric machine switch apparatus with short phase and over voltage protecting function, which is provided with a mainboard on a base plate, wherein, a D. C. relay with a normally open contact and an inner conductor binding post are arranged on the mainboard. One of the inlet phase wire binding posts and the inner conductor binding post are respectively connected with the input ends of the rectifier unit of the utility model, and the output ends of the rectifier unit are respectively connected with the input end of the D. C. relay with normally open contact. One end of the contact of the D. C. relay with normally open contact is connected with another inlet phase wire binding post, and the other end is connected in series with an actuating apparatus first and connected with one input end of a three-phase alternating current contactor coil then. The other input end of the three-phase alternating current contactor coil is connected with the remaining inlet phase wire binding post. The utility model can cut off the circuit when any phase of the three-phase power supply is power-off or when the supply voltage is to high, and can prevent the three-phase electric machine from damages caused by short phase and over voltage.
Description
Technical field
The utility model relates to a kind of three phase electric machine derailing switch, relates in particular to a kind of three phase electric machine derailing switch that the open-phase protection function is arranged, and belongs to the electrical equipment manufacture field.
Background technology
Three phase electric machine uses very general in modern industry, and its switch is controlled by the three phase electric machine derailing switch.Existing three phase electric machine derailing switch is exactly a three-phase ac contactor, its control principle is: in one of them input of the coil of three-phase ac contactor and the three lambda line phase lines wherein one be connected, be connected with another root in three lambda line phase lines behind another input serial connection starting drive of the coil of three-phase ac contactor.After opening starting drive, the coil electricity of three-phase ac contactor produces magnetic, attracts the contact switch closure, and circuit is connected, and three phase electric machine brings into operation.If wherein outage of two phase lines that is connected with the coil of three-phase ac contactor, the coil blackout of three-phase ac contactor then, magnetic disappears, the contact of three-phase ac contactor disconnects, cut off circuit, three phase electric machine is out of service, has prevented the electric power accident that three phase electric machine brings because of two-phase phase shortage wherein.
But above-mentioned three-phase ac contactor has a defective: as if the phase line outage that is not connected with the coil of three-phase ac contactor in three phase lines, two phase lines that are connected with the coil of three-phase ac contactor all there are not outage, the contact of three-phase ac contactor will can not disconnect so, at this moment three phase electric machine is with phase-deficient operation, the very fast meeting of motor is burnt, but and great electric power accident such as fire hazard.
In addition, if the power supply instability is elevated to a certain degree, three phase electric machine also is easy to be burnt.
Summary of the invention
The purpose of this utility model is to provide a kind of three phase electric machine derailing switch that phase shortage, over-voltage protecting function are arranged, the utility model when any phase line outage or supply voltage can both cut off circuit when too high, reach the purpose of phase shortage, overvoltage protection.
The utility model is achieved in that the utility model except comprising lid, base, phase line binding post and three-phase ac contactor, also comprises mainboard, and normally opened contact direct current relay and zero line binding post are installed on the mainboard; In three lambda line phase line binding posts one is connected with the input of rectifying device in the utility model respectively with the zero line binding post, the output of rectifying device is connected with the input of normally opened contact direct current relay respectively, another end with normally opened contact direct current relay contact in three lambda line phase line binding posts is connected, be connected with an input of the coil of three-phase ac contactor behind the other end tandem promoter device of normally opened contact direct current relay contact, remaining one is connected in another input of three-phase ac contactor coil and three the lambda line phase line binding posts.
As further improvement of the utility model, over-pressure safety device is installed also on the described mainboard; Two inputs of over-pressure safety device are connected with two outputs of rectifying device respectively.
When three phase electric machine moves, if two phase lines being connected with the coil of three-phase ac contactor have an outage, the coil blackout of three-phase ac contactor then, magnetic disappears, and the contact of three-phase ac contactor disconnects, the cut-out circuit, three phase electric machine is out of service; As if the phase line outage that is not connected in three phase lines with the coil of three-phase ac contactor, the output end voltage of rectifying device is zero so, normally opened contact direct current relay two inputs lose voltage, its contact disconnects, cut off the coil place circuit of three-phase ac contactor, the magnetic of three-phase ac contactor coil disappears, and the contact of three-phase ac contactor disconnects, cut off circuit, three phase electric machine is out of service.
After overvoltage protection is achieved in that the power supply energising, rectifying device work, the direct voltage of its output is added in the over-pressure safety device two ends, if voltage is normal, one-way SCR in the over-pressure safety device is in cut-off state, does not influence normally opened contact direct current relay operate as normal; To a certain degree (three phase mains has bascule if voltage is elevated to; the voltage unanimity of three phase lines; if then fluctuation simultaneously of fluctuation is arranged); one-way SCR conducting in the over-pressure safety device; it is minimum that resistance can become; be similar to short circuit; at this moment normally opened contact direct current relay two ends lose voltage; the contact of normally opened contact direct current relay disconnects, thereby cuts off the coil place circuit of three-phase ac contactor, and the magnetic of three-phase ac contactor coil disappears; the contact of three-phase ac contactor disconnects; cut off circuit, three phase electric machine is out of service, has reached the purpose of overvoltage protection.
The beneficial effects of the utility model are: by above-mentioned principle as can be known, no matter which the root outage in three phase lines, or supply voltage is too high, the utility model can both cut off circuit, make the three phase electric machine that is connected with the utility model out of service, prevented the electric power accident that three phase electric machine brings because of phase shortage, overvoltage.
Description of drawings
Accompanying drawing is the schematic top plan view after the utility model is uncapped.
Wherein, 1 base, 2 mainboards, 3 three-phase ac contactors, 4 coils, 5 rectifying devices; 6 normally opened contact direct current relays, 7 over-pressure safety devices, 8 phase lines, 9 phase lines, 10 phase lines; 11 zero lines, 12 lambda line phase line binding posts, 13 zero line binding posts, 14 outlet phase line binding posts, 15 starting drives.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing:
As shown in drawings, the utility model phase line 8,9,10 is respectively three phase lines of power supply, and zero line 11 is the zero line of power supply, and outlet phase line binding post 14 is connected with three binding posts of three phase electric machine (not in the drawings) respectively.The utility model also comprises mainboard 2 except comprising lid, base 1, lambda line phase line binding post 12 and three-phase ac contactor 3, normally opened contact direct current relay 6 and zero line binding post 13 are installed on the mainboard 2; The lambda line phase line binding post 12 that is connected with phase line 10 and zero line binding post 13 are connected with the input of rectifying device 5 in the utility model respectively, the output of rectifying device 5 is connected with the input of normally opened contact direct current relay 6 respectively, the lambda line phase line binding post 12 that is connected with phase line 9 is connected with an end of the contact of normally opened contact direct current relay 6, other end tandem promoter device 15 back of the contact of normally opened contact direct current relay 6 is connected with an input of the coil 4 of three-phase ac contactor 3, and one that is left in another input of the coil 4 of three-phase ac contactor 3 and three the lambda line phase line binding posts 12 is connected.
As further improvement of the utility model, over-pressure safety device 7 is installed also on the mainboard 2; Two inputs of over-pressure safety device 7 are connected with two outputs of rectifying device 5 respectively.Over-pressure safety device 7 can (this moment, phase line 8,9 voltages were all too high) make two inputs of normally opened contact direct current relay 6 lose voltage because of self being similar to short circuit when phase line 10 overtensions; and its contact is disconnected; cut off the coil 4 place circuit of three-phase ac contactor 3; the magnetic of the coil 4 of three-phase ac contactor 3 disappears; the contact of three-phase ac contactor 3 disconnects; cut off circuit, three phase electric machine is out of service, has reached the purpose of overvoltage protection.
When three phase electric machine moves, if in two phase lines 8 that are connected with the coil 4 of three-phase ac contactor 3 and 9 outage is arranged, then the coil 4 of three-phase ac contactor 3 will cut off the power supply, magnetic disappears, the contact of three-phase ac contactor 3 disconnects, and cuts off circuit, and three phase electric machine is out of service; If phase line 10 outages; the output end voltage of rectifying device 5 is zero so; two inputs of normally opened contact direct current relay 6 lose voltage; its contact disconnects, and cuts off the circuit at coil 4 places of three-phase ac contactor 3, and coil 4 magnetic of three-phase ac contactor 3 disappear; the contact of three-phase ac contactor 3 disconnects; cut off circuit, three phase electric machine is out of service, has reached the purpose of open-phase protection.
Claims (2)
1, a kind of three phase electric machine derailing switch that phase shortage, over-voltage protecting function are arranged, comprise lid, base, phase line binding post and three-phase ac contactor, it is characterized in that: also comprise mainboard, normally opened contact direct current relay, rectifying device and zero line are installed on the mainboard connect; In three lambda line phase line binding posts one is connected with the input of rectifying device in the utility model respectively with the zero line binding post, the output of rectifying device is connected with the input of normally opened contact direct current relay respectively, another end with the contact of normally opened contact direct current relay in three lambda line phase line binding posts is connected, be connected with an input of three-phase ac contactor coil behind the other end tandem promoter device of the contact of normally opened contact direct current relay, remaining one is connected in another input of three-phase ac contactor coil and three the lambda line phase line binding posts.
2, the three phase electric machine derailing switch that the open-phase protection function is arranged according to claim 1 is characterized in that: over-pressure safety device also is installed on the described mainboard; Two inputs of over-pressure safety device are connected with two outputs of rectifying device respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420061169 CN2726195Y (en) | 2004-09-10 | 2004-09-10 | Three-phase electric machine switch apparatus with short phase and over voltage protecting function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420061169 CN2726195Y (en) | 2004-09-10 | 2004-09-10 | Three-phase electric machine switch apparatus with short phase and over voltage protecting function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2726195Y true CN2726195Y (en) | 2005-09-14 |
Family
ID=35040899
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420061169 Expired - Fee Related CN2726195Y (en) | 2004-09-10 | 2004-09-10 | Three-phase electric machine switch apparatus with short phase and over voltage protecting function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2726195Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103414153A (en) * | 2012-08-12 | 2013-11-27 | 薛小平 | Over/under voltage protector |
-
2004
- 2004-09-10 CN CN 200420061169 patent/CN2726195Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103414153A (en) * | 2012-08-12 | 2013-11-27 | 薛小平 | Over/under voltage protector |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| 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 |