CN2343701Y - Power supply phase lack protector - Google Patents
Power supply phase lack protector Download PDFInfo
- Publication number
- CN2343701Y CN2343701Y CN 98222127 CN98222127U CN2343701Y CN 2343701 Y CN2343701 Y CN 2343701Y CN 98222127 CN98222127 CN 98222127 CN 98222127 U CN98222127 U CN 98222127U CN 2343701 Y CN2343701 Y CN 2343701Y
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- CN
- China
- Prior art keywords
- power supply
- circuit
- phase
- protector
- resistance
- 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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- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model relates to an emergency protection device for power supply phase lack, which comprises a phase lack discrimination circuit composed of three resistors with the same resistance value and a protection control circuit composed of a rectifying filtering circuit and a DC relay. When the utility model is used, the emergency protection device is matched with an AC contactor. The protection device for power supply phase lack has good protection effect of electric devices, and can automatically recover power supply.
Description
Emergency protective device when the utility model relates to the power supply phase shortage.
At present; existing open-phase protection all is the disconnection of controlling the power consumption equipment power supply by temperature-sensitive device, and promptly when three phase mains had a phase short of electricity, other biphase currents increased; the temperature-sensitive device temperature is raise and generation deformation, with the three phase supply dump of power consumption equipment.The deficiency of this open-phase protection is: 1, outage speed is slow, and power consumption equipment damages easily, the protection weak effect; 2, after power failure is got rid of, can not automatic power, need manual operation just can restore electricity.
The power supply open phase protector that the purpose of this utility model provides that a kind of power supply open-phase protection is effective, fault can automatic recovery of power supply after getting rid of.
This power supply open phase protector comprises the phase shortage discriminator circuit that is made of three identical resistance of resistance; one end of these three resistance is to be connected with the protection control circuit again after three power ends, the other ends connect together; the protection control circuit comprises a current rectifying and wave filtering circuit; between the output of current rectifying and wave filtering circuit and zero line, be connected with the coil windings of direct current relay; the normally-closed contact of direct current relay is connected with a control end of this protector, and the contact common port of direct current relay is connected with another control end of this protector.
Which phase short of electricity in order to distinguish in time in the three phase supply loop is; the power supply open phase protector also comprises the phase shortage indicating circuit; the phase shortage indicating circuit includes three shunt circuits that structure is identical; be parallel with light-emitting diode and resistance in each shunt circuit; one end of each shunt circuit is connected with a power end in the phase shortage discriminator circuit, and the other end is a power input.The quantity of the light-emitting diode in each above-mentioned shunt circuit is two, and forward of polarity, another are reverse.Also can be in each above-mentioned shunt circuit, the quantity of light-emitting diode is one, and general-purpose diode in parallel again, the polarity of this light-emitting diode and general-purpose diode, forward, another are reverse.
When installing and using; three power ends that do not contain the power supply open phase protector of phase shortage indicating circuit are connected with the three phase mains phase line; and phase line of every termination; three power inputs that perhaps will contain the power supply open phase protector of phase shortage indicating circuit are connected with the three phase mains phase line; phase line of each input termination; and between three phase mains phase line and power consumption equipment, connect the control switch of an A.C. contactor; the coil windings of this A.C. contactor; in three phase lines of one termination wherein one; one of them control end of another termination power open phase protector; another control end of power supply open phase protector and the annexation of outside line; kind decision by selected A.C. contactor; when the operating voltage of the coil windings of A.C. contactor is 220 volts; this control end connecting to neutral line; when the operating voltage of the coil windings of A.C. contactor is 380 volts, this another root phase line of control termination.
The operation principle of power supply open phase protector is: when three phase supply power supply not during phase shortage, the coil windings of A.C. contactor is through two control ends, the contact common port of the normally-closed contact of direct current relay and direct current relay and power supply form the closed-loop path, electric current is arranged in the coil, make the control switch closure of A.C. contactor, the three phase supply power supply is powered to power consumption equipment, at this moment, the tie point of phase shortage discriminator circuit and current rectifying and wave filtering circuit is a neutral point, voltage between this point and the zero line is zero or approaches zero, thereby current rectifying and wave filtering circuit is not worked, no current in the coil windings of direct current relay, normally-closed contact does not disconnect; When the three phase supply power supply has one to cut off the power supply phase shortage mutually, the phase shortage discriminator circuit has lost balance, neutral point has alternating voltage to produce, this alternating voltage becomes direct voltage behind rectification stream wave circuit, making in the coil windings of direct current relay has electric current, and the normally-closed contact of direct current relay disconnects, cut off the current circuit of ac contactor coil winding, the control switch of A.C. contactor is disconnected, cut off the three phase supply power supply of power consumption equipment, above-mentioned process just can be finished in moment.After the power supply open-phase fault is got rid of, with above-mentioned first kind of situation, automatic recovery of power supply.
Because the power supply of this power supply open phase protector energy instantaneous trip power consumption equipment when the power supply phase shortage, thereby can not damage power consumption equipment.After the power supply open-phase fault was got rid of, the energy automatic recovery of power supply did not need manual operation, has made things convenient for the electrician.
Accompanying drawing shows the embodiment of power supply open phase protector; wherein Fig. 1 is the circuit theory diagrams that do not contain the power supply open phase protector of phase shortage indicating circuit; Fig. 2 is the circuit theory diagrams that contain the power supply open phase protector of phase shortage indicating circuit; Fig. 3 is when to select the operating voltage of coil for use be 220 volts A.C. contactor; the annexation figure of power supply open phase protector and outside line; Fig. 4 is when to select the operating voltage of coil for use be 380 volts A.C. contactor, the annexation figure of power supply open phase protector and outside line.
In the present embodiment, the power supply open phase protector comprises by three resistance R that resistance is identical
4, R
5, R
6The phase shortage discriminator circuit 2 that constitutes, an end of these three resistance are to be connected with protection control circuit 3 after power end, the other end connect together again, and protection control circuit 3 comprises by diode D
7, capacitor C
1The current rectifying and wave filtering circuit 4 that constitutes is connected with the coil windings L of direct current relay 5 between the output of current rectifying and wave filtering circuit 4 and zero line
1, the normally-closed contact a of direct current relay 5 is connected with a control end W of this protector, and the contact common port b of direct current relay 5 is connected with another control end G of this protector.For improving the function of power supply open phase protector, can also increase phase shortage indicating circuit 1, phase shortage indicating circuit 1 includes three shunt circuits that structure is identical, is parallel with resistance R on first shunt circuit
1, general-purpose diode D
1, light-emitting diode D
2, be parallel with resistance R on second shunt circuit
2, general-purpose diode D
3, light-emitting diode D
4, be parallel with resistance R on the 3rd shunt circuit
3, general-purpose diode D
5, light optical diode D
6, the lower end of above-mentioned three shunt circuits respectively with R
4, R
5, R
6The upper end connect, the upper end is A, B, C three-phase power input end, above-mentioned D
1, D
3, D
5Also can replace with light-emitting diode.In order to protect the normally-closed contact a of direct current relay 5, also between normally-closed contact a and contact common port b, connect a capacitor C
2This power supply open phase protector is wanted adapted one A.C. contactor JK in use, and the annexation of its circuit is seen Fig. 3 and Fig. 4.
Claims (4)
1, a kind of power supply open phase protector; it is characterized in that comprising the phase shortage discriminator circuit (2) that constitutes by three identical resistance of resistance; one end of these three resistance is to be connected with protection control circuit (3) after three power ends, the other ends connect together again; protection control circuit (3) comprises a current rectifying and wave filtering circuit (4), is connected with the coil windings (L of direct current relay (5) between the output of current rectifying and wave filtering circuit (4) and zero line
1), the normally-closed contact (a) of direct current relay (5) is connected with a control end (W) of this protector, and the contact common port (b) of direct current relay (5) is connected with another control end (G) of this protector.
2, power supply open phase protector according to claim 1; it is characterized in that also comprising phase shortage indicating circuit (1); phase shortage indicating circuit (1) includes three shunt circuits that structure is identical; be parallel with light-emitting diode and resistance in each shunt circuit, an end of each shunt circuit is connected with a power end in the phase shortage discriminator circuit (2), the other end is power input.
3, power supply open phase protector according to claim 2, the quantity that it is characterized in that the light-emitting diode in each shunt circuit is two, and forward of polarity, another are reverse.
4, power supply open phase protector according to claim 2 is characterized in that in each shunt circuit that the quantity of light-emitting diode is one, and general-purpose diode in parallel again, the polarity of this light-emitting diode and general-purpose diode, and forward, another are anti-phase.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98222127 CN2343701Y (en) | 1998-08-13 | 1998-08-13 | Power supply phase lack protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98222127 CN2343701Y (en) | 1998-08-13 | 1998-08-13 | Power supply phase lack protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2343701Y true CN2343701Y (en) | 1999-10-13 |
Family
ID=33973534
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98222127 Expired - Fee Related CN2343701Y (en) | 1998-08-13 | 1998-08-13 | Power supply phase lack protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2343701Y (en) |
-
1998
- 1998-08-13 CN CN 98222127 patent/CN2343701Y/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 |