CN2362219Y

CN2362219Y - Phase interruption protector for phase motor

Info

Publication number: CN2362219Y
Application number: CN 99205946
Authority: CN
Inventors: 吴涛
Original assignee: Haihua Energy-Saving New Technology Inst Haihua Ceramic Co Ltd Tangshan Ci
Current assignee: Haihua Energy-Saving New Technology Inst Haihua Ceramic Co Ltd Tangshan Ci
Priority date: 1999-03-29
Filing date: 1999-03-29
Publication date: 2000-02-02
Anticipated expiration: 2009-03-29

Abstract

The utility model relates to a phase interruption protector for a phase motor. The utility model is characterized in that current sensors BA and BB are orderly connected to the phase A and the phase B of a three-phase power cord of the phase motor, wherein the end (1) of the current sensor BA is connected with a pin 1 of an optical coupler, and two ends (2) and (4) of the current sensor BA are connected with two ends (8) and (6) of the current sensor BB. The end (3) of the current sensor BA is connected with a pin 3 of an operational amplifier, the end (5) of the current sensor BB is connected with a pin 2 of the optical coupler, and the end (7) of the current sensor BB is connected with a pin 5 of the operational amplifier. The output ends of the operational amplifier are respectively connected with the input ends of an integrated circuit CD4011, the output ends of the integrated circuit CD4011 are connected with the input ends of a delayer, and the output ends of the delayer are connected with a relay. The utility model has the advantages of small size, low cost and convenient installation, etc.

Description

The phase type phase failure protector of electric motor

The utility model relates to a kind of phase failure protector of electric motor, particularly the phase type phase failure protector of electric motor.

Existing phase failure protector of electric motor is of a great variety; the phase failure that their most employings are equipped with the punching transducer on three power lines of A, B, the C of motor method is come the perception motor; or whether whether neutral point be in the phase failure that method such as zero potential surveys motor when adopting the operation of monitoring motor; the former is when the motor generation phase failure; the electric current of corresponding phase is zero, and the signal code of sensing output also is zero.The latter then be motor when normally moving neutral point voltage be zero, neutral point voltage raises much during open-phase running, whether the variation of surveying this voltage comes the phase failure of perception motor.Its weak point is: 1, three-phase power line is all installed current sensor, brings very big inconvenience to installation, in addition because the interference during big electric current makes the phase failure protector of electric motor action of this principle work of employing unreliable.During installation not only A, B, three power lines of C all to pass this device, volume is big, output incoming line too many, disturb not easy-clear.2, adopt the product that monitors the neutral point excursion principle and work more impracticable,, and then cause detection difficult and impracticable when delta connection because the motor neutral point does not exist.

The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art and provides on a kind of A, B two-phase power supply line that current sensor is loaded on motor; both made things convenient for the electrician to install; cost saving again, and volume is little, the phase type phase failure protector of electric motor of reliable working operation practicality.

The purpose of this utility model is achieved in that and comprises motor, the three-phase power line A of motor, B, C, its structural feature is: at the A of three-phase power line, B goes up mutually and is connected to current sensor BA according to the order of sequence, BB, wherein current sensor BA (1) end links to each other with 1 pin of optical coupler TIL117, (2,4) end and (8 of current sensor BB, 6) end links to each other, (3) end links to each other with 3 pin of transport and placing device LM324, (5) end of current sensor BB links to each other with 2 pin of optical coupler TIL117, (7) end links to each other with 5 pin of transport and placing device, the output of operational amplifier LM324 links to each other with the input of integrated circuit CD4011 respectively, the output of integrated circuit CD4011 links to each other with the input of delayer NE555, and the output of NE555 links to each other with relay.

The purpose of this utility model can also realize by following technical measures: 5 pin of the output of its photoelectrical coupler TIL117 link to each other with 10 pin of operational amplifier LM324,8 pin of LM324 link to each other with 8,9 pin of integrated circuit CD4011,10 pin of integrated circuit CD4011 link to each other with 2,6 pin of NE555, and 3 pin of NE555 link to each other with relay.

The utlity model has following advantage compared to existing technology:

1, be convenient to the electrician and install, and volume is little, expense is low.

2, reliable working operation, no misoperation.

3, the protection motor of in 5 seconds, cutting off the electricity supply reliably.

4, the scope of application is extensive, can use at the motor of 4.5KW--100KW.

The explanation of accompanying drawing drawing:

Accompanying drawing 1 is the utility model electricity theory structure schematic diagram.

Below in conjunction with drawings and Examples in detail the utility model is described in detail.

The utility model is a kind of protective device of motor, and its design philosophy is: establish the outage phenomenon that two current sensors are surveyed the arbitrary phase of motor three phase mains.It is by three-phase power line A, B, the C of motor, compositions such as operational amplifier LM324, photoelectrical coupler TIL117, integrated circuit CD4011, delayer NE555, relay J.Static syndeton is: current sensor BA is loaded on the A phase power line, and current sensor BB is loaded on the B phase power line.Wherein current sensor BA (1) end links to each other with 1 pin of optical coupler TIL111 by diode D6, D7, resistance R 9, link to each other with (8,6) end of current sensor BB after its (2,4) end links to each other, (3) end of current sensor BA links to each other with 3 pin of transport and placing device LM324 by resistance R 1, R3, diode D4, capacitor C 3.(5) end of current sensor BB links to each other with 2 pin, diode D1, the D2 of optical coupler TIL117, its (7) end links to each other with 5 pin of operational amplifier LM324 by resistance R 2, diode D5, and output 1,7 pin of operational amplifier LM324 link to each other with 1,2 pin of the input of integrated circuit CD4011 successively.3 pin and 5,6 pin of integrated circuit CD4011 link to each other, and 4 pin link to each other with input 6,2 pin of delayer NE555 by diode D8, D9, and diode D9 links to each other with 10 pin of integrated circuit CD4011.5 pin of the output of its photoelectrical coupler TIL117 link to each other with 10 pin of operational amplifier LM324,8 pin of LM324 link to each other with 8,9 pin of integrated circuit CD4011 by resistance R 14,10 pin of integrated circuit CD4011 link to each other with 2,6 pin of NE555 by diode D9,3 pin of NE555 link to each other with relay J, and link to each other with the base stage of triode 2SC1815 by resistance R 16.The emitter of triode 2SC1815 links to each other with 6,2 pin, the capacitor C 8 of delayer NE555, and its collector electrode is connected on the loop.Relay J is controlled by JZC22F.

Operation principle of the present utility model: motor when normal fortune between its three-phase current Ia, Ib, the Ic numerical value equate, 120 ° of phase angles of mutual deviation on the phase place, during the phase failure of C phase, A phase B phase current rises, Ia meanwhile, Ib are being not 120 ° of phase relations, but Ia=Ib.Therefore Ia, Ib phase place are 180 ° of mutual deviations on the contrary, utilize to be contained in the current sensor that A, B go up mutually and just can to detect the phase failure of C phase.And when A, the phase failure of B phase, still adopt and survey the current sensor time utmost point that corresponding A, B go up mutually and whether export and distinguished.Current sensor BA, BB are contained in A phase B successively to be gone up mutually, during electric motor normal working, BA, BB provide the operating current of electronic device for this machine, the signal voltage of A, B phase operate as normal is provided simultaneously, and when the phase failure of C phase, it is zero (during electric motor normal working, voltage is non-vanishing herein) or be approximately zero at 1,5 place's resultant voltages that the equal and opposite in direction of Ia, Ib, direction cause coil 1,2 and coil 5,6 terminals on the contrary.This signal changes optical coupler TIL117 operating state after taking out; make the 8 pin output high level of operational amplifier LM324, the 10 pin output low levels of integrated circuit CD4011 make the relay J would trip after driving delayer NE555 time-delay; cut off the electric current of motor, protected motor.And when the phase failure of A phase, 3,4 pin of current sensor BA are output as zero, make the 1 pin current potential step-down of operational amplifier LM324, make the relay J action and act on tripping operation after the 4 pin output low level driving N E555 time-delay of integrated circuit CD4011, have protected motor.The phase failure of B phase is identical with A phase phase failure principle.

Claims

1; a kind of phase type phase failure protector of electric motor; the three-phase power line A that comprises motor; B; C; it is characterized in that: at the A of three-phase power line; B goes up mutually and is connected to current sensor BA according to the order of sequence; BB; wherein current sensor BA (1) end links to each other with 1 pin of optical coupler TIL117; (2; 4) end and (8 of current sensor BB; 6) end links to each other; (3) end links to each other with 3 pin of operational amplifier LM324; (5) end of current sensor BB links to each other with 2 pin of optical coupler TIL117; (7) end links to each other with 5 pin of operational amplifier; the output of operational amplifier LM324 links to each other with the input of integrated circuit CD4011 respectively; the output of integrated circuit CD4011 links to each other with the input of delayer NE555, and the output of delayer NE555 links to each other with relay.

2, phase type phase failure protector of electric motor according to claim 1; it is characterized in that: the output of photoelectrical coupler TIL117 5 pin really links to each other with 10 pin of operational amplifier LM324; 8 pin of LM324 link to each other with 8,9 pin of integrated circuit CD4011; 10 pin of integrated circuit CD4011 link to each other with 2,6 pin of NE555, and 3 pin of NE555 link to each other with relay.