CN2539327Y - Power subtraction phase protector for three-phase power supply equipment - Google Patents
Power subtraction phase protector for three-phase power supply equipment Download PDFInfo
- Publication number
- CN2539327Y CN2539327Y CN 02214008 CN02214008U CN2539327Y CN 2539327 Y CN2539327 Y CN 2539327Y CN 02214008 CN02214008 CN 02214008 CN 02214008 U CN02214008 U CN 02214008U CN 2539327 Y CN2539327 Y CN 2539327Y
- Authority
- CN
- China
- Prior art keywords
- phase
- power supply
- contactor
- supply line
- coil winding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model relates to a power supple phase lack protector for the three-phase power supply unit, comprising an alternating current contactor and a relay. The utility model is characterized in that a coil winding of the alternating current contactor is connected with a phase of a three-phase power supply line at one end, with the other end connected with a stop key and a start key in series and then connected with another phase of the three-phase power supply line. Three contacts of the alternating current contactor are respectively connected with the three-phase power supply line in series; as for a coil winding of the relay, one end is connected with a phase of a two-phase power supply line connected with the coil winding of the alternating current contactor, and the other end is connected with the other phase of the three-phase power supply line not connected with the coil winding of the alternating current contactor. After connected in series with a control contact of the alternating current contactor in the power supply line not connected with the coil winding of the relay, a control contact of the relay is connected with both ends of the start key in parallel. The utility model has the advantages that the three-phase power supply can be cut off in time in case of any phase of the three-phase power supply line breaking or lacking and the structure is simple.
Description
Technical field
The utility model relates to the power supply open phase protector of three phase mains power supply unit.
Background technology
At present; electromechanical equipments such as all kinds of alternating current motors and water pump all are the three phase mains power supplies; its protective device is to be connected to A.C. contactor in supply line, and the coil windings of A.C. contactor is connected across in wherein the two-phase supply line, three control contacts are serially connected in the three-phase power line respectively.Since the coil windings of A.C. contactor just with three-phase power line in two be connected, if the third phase supply line of the wiring circle winding phase shortage that opens circuit not, A.C. contactor is operate as normal still, three control closings of contact, continuation is to the power supply of load phase shortage, as the electromechanical equipment of load, as the electrical equipment of motor or water pump one class, because the power supply phase shortage is very easily burnt out.The patent No. is the power supply open phase protector of a kind of three phase mains power supply unit of 01236003.1, though can realize all stopping when any phase supply line opens circuit phase shortage in the three-phase power line to electrical appliance power supply, complex structure, cost height.
Summary of the invention
The purpose of this utility model provides the power supply open phase protector that can both stop when a kind of not only three phase supply power supply any opens circuit phase shortage mutually to electrical appliance power supply but also three phase mains power supply unit simple in structure.
The power supply open phase protector of this three phase mains power supply unit; comprise an A.C. contactor; the coil windings of A.C. contactor; wherein one being connected of one end and three-phase power line; the other end with stop key; start after the button series connection again with another of three-phase power line and be connected; three control contacts of A.C. contactor are connected in the three-phase power line respectively; its design feature is also to comprise a relay; the coil windings of this relay; in one end and the two-phase supply line that connects the ac contactor coil winding any one is connected; the other end is connected with the third phase supply line that does not connect the ac contactor coil winding, the control contact of relay with do not succeed the electric apparatus coil winding that mutually after the control contact series connection of the A.C. contactor in the supply line; be connected in parallel on the two ends that start button.
The operation principle of the power supply open phase protector of this three phase mains power supply unit is: occur the phase shortage that opens circuit mutually as if any one in the two-phase supply line that connects the ac contactor coil winding, no current passes through in the ac contactor coil winding, three control contacts of A.C. contactor are converted to normally open by attracting state, cut off the three phase supply power supply of electrical appliance, at this moment, no current passes through in the relay coil winding, and it controls not adhesive of contact, disconnects ac contactor coil winding current loop; The phase shortage if the third phase supply line that does not connect the ac contactor coil winding opens circuit, no current passes through in the relay coil winding, the control contact of this relay is converted to normally open by attracting state, cut off ac contactor coil winding current loop, no current passes through in the ac contactor coil winding, identical with the principle of first kind of situation, by three three phase supply power supplys of controlling the break of contact electrical appliances of A.C. contactor; If the three phase mains normal power supply, the relay that is connected in series control contact with do not succeed the electric apparatus coil winding that mutually the control contact of the A.C. contactor in the supply line as the self holding contact of A.C. contactor.
From the above mentioned; if in the three-phase power line of the electromechanical equipment of motor or water pump one class, install power supply open phase protector described in the utility model; in the three-phase power line any one phase shortage that opens circuit mutually; can both cut off the three phase supply power supply in time, can not burn out electromechanical equipment because of the phase shortage power supply.Because only with a relay, circuit structure is simple, cost is low.
When making, relay and A.C. contactor can be assembled into one, constitute the new-type A.C. contactor that phase shortage all protects that opens circuit mutually of any one in a kind of three-phase power line.
Description of drawings
Accompanying drawing shows the circuit structure schematic diagram of the power supply open phase protector embodiment of this three phase mains power supply unit.
Among the figure, M is an electrical appliance, and FU1, FU2, FU3 are fuse.
Embodiment
With reference to accompanying drawing; the power supply open phase protector of the three phase mains power supply unit of present embodiment; comprise an A.C. contactor; the coil windings KM of A.C. contactor; one end and three-phase power line wherein one mutually B connect; the other end and the SB1 that stops key; start after the button SB2 series connection again with three-phase power line another mutually A connect; three control contact KM-1 of A.C. contactor; KM-2; KM-3 is connected on the A phase respectively; the B phase; in the C phase three-phase power line; the coil windings KA of relay; one end and the B that meets ac contactor coil winding KM supply line's connection mutually; the other end and the C that does not meet ac contactor coil winding KM supply line's connection mutually; the control contact KA-1 of relay is with after the control contact KM-1 of A.C. contactor connects; be connected in parallel on the two ends that start button SB2, the specifications and models of relay are corresponding with the specifications and models of A.C. contactor.
Claims (1)
- A kind of power supply open phase protector of three phase mains power supply unit; comprise an A.C. contactor; the coil windings of A.C. contactor (KM); one end and three-phase power line wherein one mutually (B) connect; the other end and stop key (SB1); start after button (SB2) series connection again with three-phase power line another mutually (A) connect; three control contacts (KM-1) of A.C. contactor; (KM-2); (KM-3) be connected in the three-phase power line respectively; it is characterized in that also comprising a relay; the coil windings of this relay (KA); in one end and the two-phase supply line that connects ac contactor coil winding (KM) any one (B) mutually connects; the other end is connected with the third phase that does not meet ac contactor coil winding (KM) (C) supply line, the control contact (KA-1) of relay with do not succeed the electric apparatus coil winding that mutually after control contact (KM-1) series connection of the A.C. contactor in (A) supply line; be connected in parallel on the two ends that start button (SB2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02214008 CN2539327Y (en) | 2002-04-09 | 2002-04-09 | Power subtraction phase protector for three-phase power supply equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02214008 CN2539327Y (en) | 2002-04-09 | 2002-04-09 | Power subtraction phase protector for three-phase power supply equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2539327Y true CN2539327Y (en) | 2003-03-05 |
Family
ID=33693412
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02214008 Expired - Fee Related CN2539327Y (en) | 2002-04-09 | 2002-04-09 | Power subtraction phase protector for three-phase power supply equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2539327Y (en) |
-
2002
- 2002-04-09 CN CN 02214008 patent/CN2539327Y/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 | ||
| 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 |