CN2591831Y

CN2591831Y - Three phase separate winding starting motor protector

Info

Publication number: CN2591831Y
Application number: CN 02290671
Authority: CN
Inventors: 邓平安; 陈松平
Original assignee: Tellhow Sci Tech Co Ltd
Current assignee: Tellhow Sci Tech Co Ltd
Priority date: 2002-12-25
Filing date: 2002-12-25
Publication date: 2003-12-10
Anticipated expiration: 2012-12-25

Abstract

The utility model discloses a protector for a three-phase winding motor, which is composed of a sampling circuit, a logic judgment circuit, a control output circuit, etc. The utility model can provide timely effective protection in view of the conditions that partial three-phase winding motors have the disadvantages of single winding running, phrase shortage of a three-phase power supply, unbalanced three-phase voltage, lone start time, etc. The utility model has the main characteristics of less elements, simple structure, reliable motion, and rapid response.

Description

Three-phase Separation Winding Starter Motor Protective Device

Technical field

The utility model relates to a kind of protection of three-phase sub-winding starter motor, especially a kind of Three-phase Separation Winding Starter Motor Protective Device.

Background technology

Three-phase sub-winding starter motor is a kind of AC asynchronous motor.Have advantages such as startup is convenient, staring torque is big, the startup circuit is simple, be widely used in the driving of electromechanical equipments such as blower fan, water pump, compressor.If but this motor is easy to burn motor when situations such as the operation of single group winding, three phase mains phase shortage, imbalance of three-phase voltage and start-up time be long in use take place.

Summary of the invention

The purpose of this utility model is to provide for three-phase sub-winding starter motor at above-mentioned situation a kind of device of protection.

The technical solution of the utility model is: a kind of Three-phase Separation Winding Starter Motor Protective Device, and this protective device is made up of several partial circuits such as sampling, logic determines, control outputs; Protective device has six detection port, during use it is connected to respectively on the six roots of sensation power line of sub-winding starter motor in the three-phase alternating current resource loop, detects, carries out exporting control signal after the logic determines by the six roots of sensation power line sampling to two groups of windings of motor; Protective device has a time-delay relay S, utilize two groups of windings of three-phase sub-winding starter motor to get the electric time difference and set up voltage and timing, if exceed given time output shut down control signal; Protective device during for the normal adhesive of A.C. contactor of short duration three phase mains phase shortage cause imbalance of three-phase voltage, have the false action-proof circuit to be shielded, do not export and shut down action.

Protective device comprises: contact and the lead of sample resistance R1-R6, logic distinguishing circuit D1-D4, drive circuit Q1-Q3, time-delay relay S, relay J 1-J2 and amplitude limiter circuit D5, false action-proof circuit C1, reset button SN and relay J 1-J2 are connected, D1, D2 constitute logical, D3, D4 constitute the logical "or" relation, and the delay time of time-delay relay S is 0.6 second; The main loop circuit of three-phase sub-winding starter motor comprises: three phase mains L1-L3, main contactor KM1-KM2, sub-winding starter motor M, lead; its control loop is in series by the contact of original start-up circuit and relay J 2, the coil of main contactor KM1-KM2; the six roots of sensation power line of sub-winding starter motor is divided into two groups in the main loop circuit, receive respectively on two A.C. contactors in the major loop and with test side A, the B of protective device, C, and a, b, c link to each other.

Advantage of the present utility model is: the main spy of protective device is that used element is few, simple in structure, reliable in action, response are rapid.

Description of drawings

Fig. 1 is the utility model Three-phase Separation Winding Starter Motor Protective Device structural representation.

Embodiment

A kind of Three-phase Separation Winding Starter Motor Protective Device, this protective device comprises: contact and the lead of sample resistance R1-R6, logic distinguishing circuit D1-D4, drive circuit Q1-Q3, time-delay relay S, relay J 1-J2 and amplitude limiter circuit D5, false action-proof circuit C1, reset button SN and relay J 1-J2 are connected, D1, D2 constitute logical, D3, D4 constitute the logical "or" relation, and the delay time of time-delay relay S is 0.6 second; The main loop circuit of three-phase sub-winding starter motor comprises: three phase mains L1-L3, main contactor KM1-KM2, sub-winding starter motor M, lead; its control loop is in series by the contact of original start-up circuit 1 and relay J 2, the coil of main contactor KM1-KM2; the six roots of sensation power line of sub-winding starter motor is divided into two groups in the main loop circuit, receive respectively on two A.C. contactors in the major loop and with test side A, the B of protective device, C, and a, b, c link to each other.

During normal the startup:

The K1 adhesive, A.C. contactor KM1 adhesive, first winding gets electric earlier, after 0.6 second, the K2 adhesive, A.C. contactor KM2 adhesive, another winding gets electric, finishes start-up course and enters running status.At this moment, test side A, the B of protective device, C, and a, b, c last detected be three-phase equilibrium voltage.Sample resistance R1-R3, R4-R6 central point CH1 and CH2 output voltage are zero, the equal no-output of logic distinguishing circuit D1-D2, and drive circuit Q1 output voltage is zero, relay J 1 attonity.

Carry out the elaboration of the error protection action of protective device below:

1, three phase mains phase shortage, imbalance of three-phase voltage protection: test side A, the B of protective device, C, and a, b, c last detected be three-phase imbalance voltage.Sample resistance R1-R3, R4-R6 central point CH1 and CH2 output voltage are non-vanishing, logic distinguishing circuit D1-D2 conducting output, drive circuit Q1 output voltage, relay J 1 action, make relay J 2 actions and pass through the self-locking of J2 contact, the normally-closed contact of relay J 2 disconnects simultaneously, cuts off A.C. contactor KM1, KM2 control loop power supply, sub-winding starter motor M outage.

2, A.C. contactor KM1 or KM2 loose contact cause three phase mains phase shortage or Voltage unbalance protection:

When a. A.C. contactor KM1 loose contact caused three phase mains phase shortage or Voltage unbalance, test side A, the B of protective device, C, to go up detected be three-phase imbalance voltage.Sample resistance R1-R3 central point CH1 output voltage is non-vanishing, logic distinguishing circuit D1 conducting output, drive circuit Q1 output voltage, relay J 1 action, make relay J 2 actions and pass through the self-locking of J2 contact, relay J 2 normally-closed contacts disconnect simultaneously, cut off A.C. contactor KM1, KM2 control loop power supply, sub-winding starter motor M outage.

When b. A.C. contactor KM2 loose contact caused three phase mains phase shortage or Voltage unbalance, test side a, the b of protective device, c, to go up detected be three-phase imbalance voltage.Sample resistance R4-R5 central point CH2 output voltage is non-vanishing, logic distinguishing circuit D2 conducting output, drive circuit Q1 output voltage, relay J 1 action, make relay J 2 actions and pass through the self-locking of J2 contact, the J2 normally-closed contact disconnects simultaneously, cuts off A.C. contactor KM1, KM2 control loop power supply.A.C. contactor KM1, KM2 disconnect, sub-winding starter motor M outage.

3, the two A.C. contactors orders adhesive long protection of delaying time:

When the adhesive of A.C. contactor KM1 elder generation, detect voltage on the test side A of protective device, make drive circuit Q2 output voltage through D3.Simultaneously, because not adhesive of A.C. contactor KM2, the test side a of protective device goes up and detects less than voltage, and makes drive circuit Q3 be output as 0V, and this moment, voltage difference was set up at time-delay relay S two ends, and time-delay relay S picks up counting.

If KM2 adhesive in 0.6 second also detects voltage on the test side a of protective device, make also output voltage of drive circuit Q3 through D4.This moment, time-delay relay S two ends no-voltage was poor, and time-delay relay S timing finishes and resets, the action of protective device no-output.

If the time of KM2 adhesive time-delay surpasses 0.6 second, the closing of contact of time-delay relay S makes relay J 2 actions and by the self-locking of J2 contact, the J2 normally-closed contact disconnects simultaneously, cuts off A.C. contactor KM1, KM2 control loop power supply.A.C. contactor KM1, KM2 disconnect, part winding electric machine M outage.

4, A.C. contactor KM1 or KM2 damage and to cause the operation of single group winding. and protective device output action principle is with the two A.C. contactors order adhesive long protection of delaying time.

5, of short duration three phase mains phase shortage causes that imbalance of three-phase voltage is shielded by false action-proof circuit C1 during the normal adhesive in the three-phase contact of A.C. contactor KM1 or KM2, and protective device is output action not.

6, behind the protective device output action since after relay J 2 adhesives by the self-locking of J2 contact, the guard mode of output is kept always, press or disconnect the protective device power supply up to reset button, protective device returns to initial condition.

Claims

1, a kind of Three-phase Separation Winding Starter Motor Protective Device is characterized in that: this Three-phase Separation Winding Starter Motor Protective Device is made up of several partial circuits such as sampling, logic determines, control outputs; Protective device has six detection port, during use it is connected to respectively on the six roots of sensation power line of sub-winding starter motor in the three-phase alternating current resource loop, detects, carries out exporting control signal after the logic determines by the six roots of sensation power line sampling to two groups of windings of motor; Protective device has a time-delay relay S, utilize two groups of windings of three-phase sub-winding starter motor to get the electric time difference and set up voltage and timing, if exceed given time output shut down control signal; Protective device during for the normal adhesive of A.C. contactor of short duration three phase mains phase shortage cause imbalance of three-phase voltage, have the false action-proof circuit to be shielded, do not export and shut down action.

2, Three-phase Separation Winding Starter Motor Protective Device according to claim 1, it is characterized in that: protective device comprises: contact and the lead of sample resistance R1-R6, logic distinguishing circuit D1-D4, drive circuit Q1-Q3, time-delay relay S, relay J 1-J2 and amplitude limiter circuit D5, false action-proof circuit C1, reset button SN and relay J 1-J2 are connected, D1, D2 constitute logical, D3, D4 constitute the logical "or" relation, and the delay time of time-delay relay S is 0.6 second; The main loop circuit of three-phase sub-winding starter motor comprises: three phase mains L1-L3, main contact KM1-KM2, sub-winding starter motor M, lead; its control loop is in series by the contact of original start-up circuit (1) and relay J 2, the main coil that contacts KM1-KM2; the six roots of sensation power line of sub-winding starter motor is divided into two groups in the main loop circuit, receive respectively on two A.C. contactors in the major loop and with test side A, the B of protective device, C, and a, b, c link to each other.