CN202424118U - Three-phase power supply open-phase protector - Google Patents
Three-phase power supply open-phase protector Download PDFInfo
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- CN202424118U CN202424118U CN2012200390367U CN201220039036U CN202424118U CN 202424118 U CN202424118 U CN 202424118U CN 2012200390367 U CN2012200390367 U CN 2012200390367U CN 201220039036 U CN201220039036 U CN 201220039036U CN 202424118 U CN202424118 U CN 202424118U
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Abstract
The utility model discloses a three-phase power supply open-phase protector which comprises an alternating-current contact circuit connected with the three-phase supply circuit in series. The utility model is characterized in that the control end of the alternating-current contact circuit is connected with an open-phase protection circuit; a resistor R1, a resistor R2 and a resistor R3 form a star connection; the common end of the resistors R1, R2 and R3 is connected with a cathode of a voltage regulator diode DW1; an anode of the voltage regulator diode DW1 is connected with an optical coupler O1; the negative output end of the optical coupler O1 is connected with a base of a triode Q1; a collector of the triode Q1 is connected with a coil of a relay JK1 in series and then connected with the direct current power supply; and a normally closed switch of the relay JK1 is connected into a power supply loop at the control end of the alternating-current contact circuit in series. The utility model can quickly respond to the open-phase failure in the power grid to protect the safety of electric equipment. The utility model has the advantage of small size, and can quickly and automatically adjust the phase sequence of the power supply to the phase sequence required by the normal operation of the equipment according to the change of the phase sequence.
Description
Technical field
The utility model belongs to the safety utilization of electric power technical field, particularly a kind of three phase mains open phase protector.
Background technology
Along with the extensive use of three-phase electricity, get into civil area, like the application of high-power three-phase air-conditioning, motor from industrial circle.But very important during the safe handling of three-phase electricity, phase shortage appears, just be easy to cause device damage, like three-phase air-conditioning in the unattended equipment room.If the compressor of air-conditioning is being worked when turning round, broken string (phase shortage) burns expensive compressor this moment the most easily suddenly; After phase sequence changes in the power supply for various reasons; Will cause air-conditioning to break down does not work; Cause the computer room temperature of sealing high especially; The line transfer (commutation) if the untimely professional of group is on the scene will make equipment and damages such as relevant device such as battery, power module, causes heavy economic losses for country, collective, individual.
The utility model content
The purpose of the utility model is to propose a kind of simple in structure, three phase mains open phase protector that cost is low, stable and reliable for performance; Can tackle the open-phase fault that occurs in the electrical network fast; The safety of protection power consumption equipment; Have the little advantage of volume, can be built in the power consumption equipment, reduce equipment fault, practice thrift equipment maintenance cost, prolong service life of equipment.
The technical scheme of the utility model is following: a kind of three phase mains open phase protector, comprise the interchange contact circuit that is serially connected on the three-phase power line, and its key is: the control end of said interchange contact circuit is connected with open-phase protection circuit;
Three-phase power line is made up of the first phase power line R, the second phase power line S, third phase power line T and power ground.
Said open-phase protection circuit comprises resistance R 1, resistance R 2, the resistance R 3 that is arranged on the power line, and said resistance R 1, resistance R 2 and resistance R 3 are Y-connection, and wherein the free end of resistance R 1 is connected on the first phase power line R; The free end of resistance R 2 is connected on the second phase power line S; The free end of resistance R 3 is connected on the third phase power line T, and the common port of said resistance R 1, resistance R 2, resistance R 3 connects the anode of diode D1, and the negative electrode of this diode D1 connects the negative electrode of voltage stabilizing didoe DW1; The anode of this voltage stabilizing didoe DW1 connects the positive input of optocoupler O1; The negative input ground connection of this optocoupler O1, the forward output termination DC power supply of this optocoupler O1, ground connection behind the negative sense output crosstalk resistance R11; This negative sense output also connects the base stage of triode Q1; The grounded emitter of this triode Q1 connects DC power supply behind the coil of collector electrode string relay J K1, and the normally closed switch of this relay J K1 is serially connected in the current supply circuit of said interchange contact circuit control end.
The normally closed switch of relay J K1 is supplied power to exchanging the contact circuit control end through any phase power line in the said three-phase power line.
When not having open-phase fault, the common port voltage of resistance R 1, resistance R 2, resistance R 3 is zero, after open-phase fault occurring; The common port voltage of resistance R 1, resistance R 2, resistance R 3 skyrockets, and its magnitude of voltage is higher than the conducting voltage of voltage stabilizing didoe DW1 far away, and voltage stabilizing didoe DW1 supplies power to optocoupler O1; The conducting of optocoupler O1 output group, triode Q1 base stage gets electric, triode Q1 conducting; The coil of relay J K1 gets electric, relay J K1 normally closed switch break off, make to exchange the contact circuit dead electricity; The interchange contact circuit breaks off, and stops the electric current of open-phase fault externally to be supplied power, and has protected the safety of power consumption equipment.
Ground connection behind the negative electrode string divider resistance R8 of said diode D1; The negative electrode of said diode D1 also crosstalk holds ground connection behind the C6.
Meet said optocoupler O1 after the anode series resistance R 10 of said voltage stabilizing didoe DW1; Ground connection behind the anode series divider resistance R9 of said voltage stabilizing didoe DW1; The anode of said voltage stabilizing didoe DW1 also crosstalk is separated capacitor C 7 back ground connection.
Ground connection behind the base stage crosstalk appearance C8 of said triode Q1; Be serially connected with emitting led 1 between the collector electrode of said triode Q1 and the DC power supply.
Said interchange contact circuit is provided with A.C. contactor C1; The normally closed switch of said relay J K1 is serially connected in the current supply circuit of this A.C. contactor C1 coil, and the normal open switch AA1 of this A.C. contactor C1, normal open switch BB1, normal open switch CC1 are serially connected in respectively on three phase lines of three phase mains.
Said interchange contact circuit also is connected with commutation circuit, and this commutation circuit comprises phase-shift circuit;
Said phase-shift circuit is made up of resistance circuit, capacitive circuit and RC circuit; The said first phase power line R of the preceding termination of resistance circuit wherein; The said second phase power line S of the preceding termination of capacitive circuit; The said third phase power line of the preceding termination T of RC circuit, after the rear end of said resistance circuit, capacitive circuit and RC circuit connected together, string load resistance R14 was connected with said third phase power line T;
The rear end of said resistance circuit, capacitive circuit and RC circuit also is attempted by on the anode of diode D3; The negative electrode of this diode D3 connects the negative electrode of voltage stabilizing didoe DW2; Connect the positive input of optocoupler O2 after the anode series resistance R 17 of this voltage stabilizing didoe DW2, the negative input of this optocoupler O2 meets said third phase power line T, the forward output termination DC power supply of optocoupler O2; Ground connection behind the negative sense output crosstalk resistance R20; This negative sense output also connects the base stage of triode Q2, and the grounded emitter of this triode Q2 connects DC power supply behind the coil of collector electrode string relay J K2;
Phase-shift circuit is a mature technology, when the three-phase electricity anti-phase connect anti-after, situation that power phase changes promptly appears and after; The phase-shift circuit output HIGH voltage; Voltage stabilizing didoe DW2 conducting, optocoupler O2 gets the electrician and does, and the base stage of triode Q2 obtains high level; Triode Q2 conducting, the coil of relay J K2 get the electrician and do.
The coil of relay J K2 gets when electric, and normal open switch is closed, and normal open switch breaks off;
During the coil power down of relay J K2, normal open switch breaks off, and normal open switch is closed;
The normally closed switch of said relay J K2 is serially connected between the coil of normally closed switch and said A.C. contactor C1 of said relay J K1;
The normal open switch of said relay J K2 is serially connected between the coil of normally closed switch and A.C. contactor C2 of said relay J K1;
The operating state of relay J K2, the work relationship of decision A.C. contactor C1 and A.C. contactor C2.A.C. contactor C1 and A.C. contactor C2 have confirmed a kind of output phase sequence respectively, realize the automatic phase sequence adjustment to power consumption equipment.
Also be connected with interlock circuit between A.C. contactor C1 and the A.C. contactor C2, avoid the two to work simultaneously.
The normally closed switch of the said JK2 of one termination of said A.C. contactor C1 coil, ground connection behind the said A.C. contactor C2 of the other end string normally closed switch a2a of A.C. contactor C1 coil;
The normal open switch of the said JK2 of one termination of said A.C. contactor C2 coil, ground connection behind the said A.C. contactor C1 of the other end string normally closed switch a2a of A.C. contactor C2 coil.
The A end of said A.C. contactor C2 normal open switch AA1 is connected with the A end of A.C. contactor C1 normal open switch AA1; The B end of A.C. contactor C2 normal open switch BB1 is connected with the B end of A.C. contactor C1 normal open switch BB1, and the C end of A.C. contactor C2 normal open switch CC1 is connected with the C end of A.C. contactor C1 normal open switch CC1;
The A1 end of said A.C. contactor C2 normal open switch AA1 is connected with the B1 end of A.C. contactor C1 normal open switch BB1; The B1 end of said A.C. contactor C2 normal open switch BB1 is connected with the A1 end of A.C. contactor C1 normal open switch AA1, and the C1 end of A.C. contactor C2 normal open switch CC1 is connected with the C1 end of A.C. contactor C1 normal open switch CC1.
The negative electrode of said diode D3 meets said third phase power line T after meeting divider resistance R15; The negative electrode of said diode D3 also crosstalk meets said third phase power line T after holding C9.
The anode of said voltage stabilizing didoe DW2 meets said third phase power line T after meeting divider resistance R16; The anode of said voltage stabilizing didoe DW2 also crosstalk meets said third phase power line T after separating capacitor C 10.
Ground connection behind the base stage crosstalk appearance C11 of said triode Q2; Be serially connected with emitting led 2 between the collector electrode of said triode Q1 and the DC power supply.
The said first phase power line R, the second phase power line S, third phase power line T are connected with one road low-voltage regulated power supply circuit respectively; Three road low-voltage regulated power supply circuit structures are consistent; The output of three road low-voltage regulated power supply circuit also connects together, forms said DC power supply;
After the low-voltage regulated power supply circuit that the said first phase power line R connects comprises that C12 is held in crosstalk again after this resistance R 23 of resistance R 23, the first phase power line R string, be connected the negative electrode of diode D10; The plus earth of this diode D10; The negative electrode of this diode D10 also connects the anode of diode D5, and the negative electrode of this diode D5 connects the negative electrode of voltage stabilizing didoe DW3, the anode series resistance R 29 back ground connection of this voltage stabilizing didoe DW3; The anode of this voltage stabilizing didoe DW3 also connects the base stage of triode Q3; The grounded emitter of this triode Q3, collector electrode connects the negative electrode of said diode D5, and the collector electrode of this triode Q3 also crosstalk is separated capacitor C 15 back ground connection; The collector electrode of this triode Q3 also connects the anode of diode D12; The negative electrode of this diode D12 output D.C. regulated power supply, this direct current be through electrochemical capacitor C18 filtering, and the said first phase power line R also goes here and there emitting led 5 back ground connection.
Beneficial effect: the utility model provides a kind of simple in structure, three phase mains open phase protector that cost is low, and the open-phase fault that can fast detecting occurs in the electrical network cuts off the control voltage of output AC; Powered-down, powered-down, the safety of protection power consumption equipment; It is little to have volume, and can automatically power phase be adjusted to the required phase sequence of equipment operate as normal rapidly according to the variation of phase sequence; The utility model is simple in structure, can be built in the power consumption equipment, like air-conditioning; Make it become a intelligent air condition, reduce equipment fault, practice thrift equipment maintenance cost, prolong service life of equipment by common air-conditioning.
Description of drawings
Fig. 1 is the circuit diagram of the utility model.
Embodiment:
Below in conjunction with accompanying drawing the utility model is further described.
See also Fig. 1: a kind of three phase mains open phase protector, comprise the interchange contact circuit that is serially connected on the three-phase power line, the control end of said interchange contact circuit is connected with open-phase protection circuit;
Said open-phase protection circuit comprises resistance R 1, resistance R 2, the resistance R 3 that is arranged on the power line; Said resistance R 1, resistance R 2 and resistance R 3 are Y-connection; Wherein the free end of resistance R 1 is connected on the first phase power line R; The free end of resistance R 2 is connected on the second phase power line S, and the free end of resistance R 3 is connected on the third phase power line T.
The common port of said resistance R 1, resistance R 2, resistance R 3 connects the anode of diode D1; The negative electrode of this diode D1 connects the negative electrode of voltage stabilizing didoe DW1, and the anode of this voltage stabilizing didoe DW1 connects the positive input of optocoupler O1, the negative input ground connection of this optocoupler O1; The forward output termination DC power supply of this optocoupler O1; Ground connection behind the negative sense output crosstalk resistance R11, this negative sense output also connects the base stage of triode Q1, the grounded emitter of this triode Q1; Connect DC power supply behind the coil of collector electrode string relay J K1, the normally closed switch of this relay J K1 is serially connected in the current supply circuit of said interchange contact circuit control end.
Ground connection behind the negative electrode string divider resistance R8 of said diode D1; The negative electrode of said diode D1 also crosstalk holds ground connection behind the C6.
Meet said optocoupler O1 after the anode series resistance R 10 of said voltage stabilizing didoe DW1; Ground connection behind the anode series divider resistance R9 of said voltage stabilizing didoe DW1; The anode of said voltage stabilizing didoe DW1 also crosstalk is separated capacitor C 7 back ground connection.
Ground connection behind the base stage crosstalk appearance C8 of said triode Q1; Be serially connected with emitting led 1 between the collector electrode of said triode Q1 and the DC power supply.
Said interchange contact circuit is provided with A.C. contactor C1; The normally closed switch of said relay J K1 is serially connected in the current supply circuit of this A.C. contactor C1 coil, and the normal open switch AA1 of this A.C. contactor C1, normal open switch BB1, normal open switch CC1 are serially connected in respectively on three phase lines of three phase mains.
Said interchange contact circuit also is connected with commutation circuit, and this commutation circuit comprises phase-shift circuit;
Said phase-shift circuit is made up of resistance circuit, capacitive circuit and RC circuit; The said first phase power line R of the preceding termination of resistance circuit wherein; The said second phase power line S of the preceding termination of capacitive circuit; The said third phase power line of the preceding termination T of RC circuit, after the rear end of said resistance circuit, capacitive circuit and RC circuit connected together, string load resistance R14 was connected with said third phase power line T;
The rear end of said resistance circuit, capacitive circuit and RC circuit also is attempted by on the anode of diode D3; The negative electrode of this diode D3 connects the negative electrode of voltage stabilizing didoe DW2; Connect the positive input of optocoupler O2 after the anode series resistance R 17 of this voltage stabilizing didoe DW2, the negative input of this optocoupler O2 meets said third phase power line T, the forward output termination DC power supply of optocoupler O2; Ground connection behind the negative sense output crosstalk resistance R20; This negative sense output also connects the base stage of triode Q2, and the grounded emitter of this triode Q2 connects DC power supply behind the coil of collector electrode string relay J K2;
The normally closed switch of said relay J K2 is serially connected between the coil of normally closed switch and said A.C. contactor C1 of said relay J K1;
The normal open switch of said relay J K2 is serially connected between the coil of normally closed switch and A.C. contactor C2 of said relay J K1;
The A end of said A.C. contactor C2 normal open switch AA1 is connected with the A end of A.C. contactor C1 normal open switch AA1; The B end of A.C. contactor C2 normal open switch BB1 is connected with the B end of A.C. contactor C1 normal open switch BB1, and the C end of A.C. contactor C2 normal open switch CC1 is connected with the C end of A.C. contactor C1 normal open switch CC1;
The A1 end of said A.C. contactor C2 normal open switch AA1 is connected with the B1 end of A.C. contactor C1 normal open switch BB1; The B1 end of said A.C. contactor C2 normal open switch BB1 is connected with the A1 end of A.C. contactor C1 normal open switch AA1, and the C1 end of A.C. contactor C2 normal open switch CC1 is connected with the C1 end of A.C. contactor C1 normal open switch CC1.
Meet said third phase power line T behind the negative electrode string divider resistance R15 of said diode D3; The negative electrode of said diode D3 also crosstalk meets said third phase power line T after holding C9.
Meet said third phase power line T behind the anode series divider resistance R16 of said voltage stabilizing didoe DW2; The anode of said voltage stabilizing didoe DW2 also crosstalk meets said third phase power line T after separating capacitor C 10.
Ground connection behind the base stage crosstalk appearance C11 of said triode Q2; Be serially connected with emitting led 2 between the collector electrode of said triode Q1 and the DC power supply.
The DC power supply that commutation circuit and open-phase protection circuit adopted can be provided by the outside, also can directly from three phase mains, obtain, and its mode is more, with the lower part wherein a kind of power circuit that directly obtains only is provided, as a reference.
The said first phase power line R, the second phase power line S, third phase power line T are connected with one road low-voltage regulated power supply circuit respectively; Three road low-voltage regulated power supply circuit structures are consistent; The output of three road low-voltage regulated power supply circuit also connects together, forms said DC power supply;
After the low-voltage regulated power supply circuit that the said first phase power line R connects comprises that C12 is held in crosstalk again after this resistance R 23 of resistance R 23, the first phase power line R string, be connected the negative electrode of diode D10; The plus earth of this diode D10; The negative electrode of this diode D10 also connects the anode of diode D5, and the negative electrode of this diode D5 connects the negative electrode of voltage stabilizing didoe DW3, the anode series resistance R 29 back ground connection of this voltage stabilizing didoe DW3; The anode of this voltage stabilizing didoe DW3 also connects the base stage of triode Q3; The grounded emitter of this triode Q3, collector electrode connects the negative electrode of said diode D5, and the collector electrode of this triode Q3 also crosstalk is separated capacitor C 15 back ground connection; The collector electrode of this triode Q3 also connects the anode of diode D12; The negative electrode output DC of this diode D12, this direct current be through electrochemical capacitor C18 filtering, and the said first phase power line R also goes here and there emitting led 5 back ground connection.
Claims (10)
1. a three phase mains open phase protector comprises the interchange contact circuit that is serially connected on the three-phase power line, and it is characterized in that: the control end of said interchange contact circuit is connected with open-phase protection circuit;
Said open-phase protection circuit comprises resistance R 1, resistance R 2, the resistance R 3 that is arranged on the power line, and said resistance R 1, resistance R 2 and resistance R 3 are Y-connection, and wherein the free end of resistance R 1 is connected on the first phase power line R; The free end of resistance R 2 is connected on the second phase power line S; The free end of resistance R 3 is connected on the third phase power line T, and the common port of said resistance R 1, resistance R 2, resistance R 3 connects the anode of diode D1, and the negative electrode of this diode D1 connects the negative electrode of voltage stabilizing didoe DW1; The anode of this voltage stabilizing didoe DW1 connects the positive input of optocoupler O1; The negative input ground connection of this optocoupler O1, the forward output termination DC power supply of this optocoupler O1, ground connection behind the negative sense output crosstalk resistance R11; This negative sense output also connects the base stage of triode Q1; The grounded emitter of this triode Q1 connects DC power supply behind the coil of collector electrode string relay J K1, and the normally closed switch of this relay J K1 is serially connected in the current supply circuit of said interchange contact circuit control end.
2. three phase mains open phase protector according to claim 1 is characterized in that: ground connection behind the negative electrode string divider resistance R8 of said diode D1; The negative electrode of said diode D1 also crosstalk holds ground connection behind the C6.
3. three phase mains open phase protector according to claim 1 is characterized in that: meet said optocoupler O1 after the anode series resistance R 10 of said voltage stabilizing didoe DW1; Ground connection behind the anode series divider resistance R9 of said voltage stabilizing didoe DW1; The anode of said voltage stabilizing didoe DW1 also crosstalk is separated capacitor C 7 back ground connection.
4. three phase mains open phase protector according to claim 1 is characterized in that: ground connection behind the base stage crosstalk appearance C8 of said triode Q1; Be serially connected with emitting led 1 between the collector electrode of said triode Q1 and the DC power supply.
5. three phase mains open phase protector according to claim 1; It is characterized in that: said interchange contact circuit is provided with A.C. contactor C1; The normally closed switch of said relay J K1 is serially connected in the current supply circuit of this A.C. contactor C1 coil, and the normal open switch AA1 of this A.C. contactor C1, normal open switch BB1, normal open switch CC1 are serially connected in respectively on three phase lines of three phase mains.
6. three phase mains open phase protector according to claim 5 is characterized in that: said interchange contact circuit also is connected with commutation circuit, and this commutation circuit comprises phase-shift circuit;
Said phase-shift circuit is made up of resistance circuit, capacitive circuit and RC circuit; The said first phase power line R of the preceding termination of resistance circuit wherein; The said second phase power line S of the preceding termination of capacitive circuit; The said third phase power line of the preceding termination T of RC circuit, after the rear end of said resistance circuit, capacitive circuit and RC circuit connected together, string load resistance R14 was connected with said third phase power line T;
The rear end of said resistance circuit, capacitive circuit and RC circuit also is attempted by on the anode of diode D3; The negative electrode of this diode D3 connects the negative electrode of voltage stabilizing didoe DW2; Connect the positive input of optocoupler O2 after the anode series resistance R 17 of this voltage stabilizing didoe DW2, the negative input of this optocoupler O2 meets said third phase power line T, the forward output termination DC power supply of optocoupler O2; Ground connection behind the negative sense output crosstalk resistance R20; This negative sense output also connects the base stage of triode Q2, and the grounded emitter of this triode Q2 connects DC power supply behind the coil of collector electrode string relay J K2;
The normally closed switch of said relay J K2 is serially connected between the coil of normally closed switch and said A.C. contactor C1 of said relay J K1;
The normal open switch of said relay J K2 is serially connected between the coil of normally closed switch and A.C. contactor C2 of said relay J K1;
The A end of said A.C. contactor C2 normal open switch AA1 is connected with the A end of A.C. contactor C1 normal open switch AA1; The B end of A.C. contactor C2 normal open switch BB1 is connected with the B end of A.C. contactor C1 normal open switch BB1, and the C end of A.C. contactor C2 normal open switch CC1 is connected with the C end of A.C. contactor C1 normal open switch CC1;
The A1 end of said A.C. contactor C2 normal open switch AA1 is connected with the B1 end of A.C. contactor C1 normal open switch BB1; The B1 end of said A.C. contactor C2 normal open switch BB1 is connected with the A1 end of A.C. contactor C1 normal open switch AA1, and the C1 end of A.C. contactor C2 normal open switch CC1 is connected with the C1 end of A.C. contactor C1 normal open switch CC1.
7. three phase mains open phase protector according to claim 5 is characterized in that: meet said third phase power line T behind the negative electrode string divider resistance R15 of said diode D3; The negative electrode of said diode D3 also crosstalk meets said third phase power line T after holding C9.
8. three phase mains open phase protector according to claim 5 is characterized in that: meet said third phase power line T behind the anode series divider resistance R16 of said voltage stabilizing didoe DW2; The anode of said voltage stabilizing didoe DW2 also crosstalk meets said third phase power line T after separating capacitor C 10.
9. three phase mains open phase protector according to claim 5 is characterized in that: ground connection behind the base stage crosstalk appearance C11 of said triode Q2; Be serially connected with emitting led 2 between the collector electrode of said triode Q1 and the DC power supply.
10. three phase mains open phase protector according to claim 1; It is characterized in that: the said first phase power line R, the second phase power line S, third phase power line T are connected with one road low-voltage regulated power supply circuit respectively; Three road low-voltage regulated power supply circuit structures are consistent; The output of three road low-voltage regulated power supply circuit also connects together, forms said DC power supply;
After the low-voltage regulated power supply circuit that the said first phase power line R connects comprises that C12 is held in crosstalk again after this resistance R 23 of resistance R 23, the first phase power line R string, be connected the negative electrode of diode D10; The plus earth of this diode D10; The negative electrode of this diode D10 also connects the anode of diode D5, and the negative electrode of this diode D5 connects the negative electrode of voltage stabilizing didoe DW3, the anode series resistance R 29 back ground connection of this voltage stabilizing didoe DW3; The anode of this voltage stabilizing didoe DW3 also connects the base stage of triode Q3; The grounded emitter of this triode Q3, collector electrode connects the negative electrode of said diode D5, and the collector electrode of this triode Q3 also crosstalk is separated capacitor C 15 back ground connection; The collector electrode of this triode Q3 also connects the anode of diode D12; The negative electrode output DC of this diode D12, this direct current be through electrochemical capacitor C18 voltage stabilizing, and the said first phase power line R also goes here and there emitting led 5 back ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200390367U CN202424118U (en) | 2012-01-19 | 2012-01-19 | Three-phase power supply open-phase protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200390367U CN202424118U (en) | 2012-01-19 | 2012-01-19 | Three-phase power supply open-phase protector |
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| Publication Number | Publication Date |
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| CN202424118U true CN202424118U (en) | 2012-09-05 |
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| CN2012200390367U Expired - Fee Related CN202424118U (en) | 2012-01-19 | 2012-01-19 | Three-phase power supply open-phase protector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104577968A (en) * | 2015-02-05 | 2015-04-29 | 上海和宗焊接设备制造有限公司 | Three-phase overvoltage, under-voltage and default phase integrated protection circuit |
-
2012
- 2012-01-19 CN CN2012200390367U patent/CN202424118U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104577968A (en) * | 2015-02-05 | 2015-04-29 | 上海和宗焊接设备制造有限公司 | Three-phase overvoltage, under-voltage and default phase integrated protection circuit |
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