CN2178399Y

CN2178399Y - Electronic general starter

Info

Publication number: CN2178399Y
Application number: CN 93225957
Authority: CN
Inventors: 许光德
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-01-13
Filing date: 1993-06-30
Publication date: 1994-09-28
Anticipated expiration: 2003-06-30

Abstract

The utility model relates to an electronic general starter, which is a low-voltage electrical apparatus. The utility model is used for controlling the load, particularly the on-off of the power supply of an electromotor. The utility model adopts a contactor as a main switch, and the utility model assembles a current transformer, a zero sequence current transformer, a control circuit, a testing device, etc. into a whole. When the load generates various faults, the contactor can be released automatically, and the power supply of the load is switched off. The utility model has the functions of overload protection, short-circuit protection, lack-phase protection, overvoltage protection, undervoltage protection, electrical leakage protection, electrical shock protection and various status display, in addition, the utility model is provided with a remote-control interface circuit, the utility model, a relay and a sensor can be assembled into an assembled apparatus, the functions of the utility model is expanded, and the application range is wide.

Description

Electronic general starter

The utility model relates to a kind of low-voltage electrical apparatus, particularly a kind of combined starter of controlling motor.

The electrical equipment of various controls of producing at present and using and protection motor; the combined electrical apparatus of electromagnetic starter, combined starter, motor protector and leakage relay and contactor etc. is arranged; they have played protective effect to motor at different aspect; but function singleness separately; be one respectively, install and use inconvenience.

The purpose of this utility model; be to integrate control and kinds of protect; change the single overload protection of thermal relay in the former electromagnetic starter; and become the combined starter of the kinds of protect of electronic type; as overload, short circuit, open-phase protection, overvoltage, under voltage and electric leakage electrical shock protection etc. are provided with Remote Control Interface in control circuit; can constitute combined electrical apparatus with other relay, transducer neatly, further expand its function.

The purpose of this utility model, realized by following scheme:

The employing contactor is a main switch, connects and the disjunction load power supply of motor particularly with it.Contactor can be common A.C. contactor, can be the electricity-saving type A.C. contactor, also can be the A.C. contactor of DC control.

Adopt current transformer, follow the tracks of load current with it, as the sampling element of overload, short circuit, phase shortage.

Adopt zero sequence current mutual inductor, follow the tracks of the whole phases of load main circuit (line) electric current, as the sampling element of electric leakage, shock current with it.It generally is placed in the load-side of contactor, also allows to be placed in mains side.

Experimental rig is set, whether normal with regular detection leakage protection circuit.

Control circuit is set, and it comprises main control circuit, electronic control circuit and Remote Control Interface, with the opening and closing of control contactor.

Main control circuit is provided with manual operation button, contactor latching circuit, is used for Artificial Control contactor opening and closing.Its power supply can be an AC power of directly taking from main circuit, also can be by the type of contactor, and the DC power supply of configuration rectification circuit.Also be provided with the relay normally closed interlock in the circuit, be controlled by electronic control circuit, realize that automatic control contactor discharges.In starting button and latching circuit, Remote Control Interface is set, be controlled by other relay, transducer, to realize the opening and closing of remote control contactor.

In the electronic control circuit, overload, short circuit, phase shortage discriminator circuit, overvoltage, under voltage, sampling discriminator circuit, electric leakage discriminator circuit and their time-delay, triggering, display circuit and common executive circuits separately are set.At executive circuit input and its power end Remote Control Interface is set.Relay in the executive circuit discharges by the automatic control contactor of its normally closed interlock.

The utility model can be by the needs of function, to the supporting as required choice of each functional unit.According to the contactor type of selecting for use, form the electronic type combined starter series of different model.

Below, accompanying drawing in conjunction with the embodiments is further described the utility model:

Fig. 1 structure chart Fig. 6 is that Fig. 1 removes to cover vertical view

1 lid, 2 contactor KM, 3 current transformer TA1～3

4 optical display unit H1～7 5 binding posts, 6 leak(age) test button SB

7 supports, 8 control circuit boards, 9 potentiometer RP1～3

10 bases, 11 zero sequence current mutual inductor LH, 12 starting button ST

13 stop button STP, 14 control power transformer T

Fig. 2 control system figure

Fig. 3 circuit diagram

Fig. 4 remote control interface circuit (in the main control circuit)

Fig. 5 remote control interface circuit (in the electronic control circuit)

The normal condition (see figure 2):

Press starting button ST, contactor KM adhesive and self-locking, motor starting, operate as normal.Control power transformer T output voltage gets the control circuit DC power supply through rectification circuit VC1 and integrated regulator CW, and optical display unit H7 is bright.The power supply of fault display circuit A7 is taken from the contactor mains side, gets through capacitance decompression, rectification.When pushing starting button ST, its normally closed interlock is with its power supply disjunction, and this is instantaneous, fault detector is extinguished reset.Push stop button STP, contactor discharges.

The failure condition (see figure 3):

Electric leakage, get an electric shock: zero sequence current mutual inductor LH is a sampling element, and discriminator circuit A8 is made up of integrated circuit (IC) 1 and controllable silicon V7 and resistance-capacitance circuit.When electric leakage or shock current appearred in load-side, zero sequence current mutual inductor is paid the limit just had induced voltage to export A8 to, differentiated through IC1, made the V7 conducting, output high potential, one road to display circuit A7, one road to executive circuit A4.

Overload, short circuit: current transformer TA1, TA2, TA3 are their sampling element, wherein pay limit composition or door for one group, short circuit discriminator circuit A2 mainly is made up of resistor voltage divider circuit and trigger IC7, and overload discriminator circuit A3 mainly is made up of resistor voltage divider circuit, transistor switching circuit and rc-delay circuit and trigger IC8.When overload or short circuit appearred in the arbitrary phase of load (line), current transformer was paid the limit output potential and is increased, if short circuit, then instantaneous trigger IC7 conversion, the output high potential of making.If overload, then through RP3 and C1 time-delay, the early warning circuit b1 that transships simultaneously output positive potential makes overload display H2 bright.In the time-delay process, if overload disappears, then can reset, if overload reaches the stipulated time, then trigger IC8 conversion, output high potential.RP1, RP2, RP3 are respectively short circuit, overload, delayed setting value adjustment potentiometer.

Phase shortage: current transformer TA1, TA2, TA3 are its sampling element, and discriminator circuit A1 is made up of NAND gate IC5 and rc-delay circuit.Lack a phase as long as load circuit is appointed, IC5 exports high potential, and through time-delay.

Overvoltage, under-voltage: their sampling discriminator circuit is respectively A6, A5, forms by resistor voltage divider circuit and trigger IC4 and IC3, IC2 and rc-delay circuit respectively, and when overvoltage, under voltage appear in load power source, the output high potential.

Executive circuit A4 mainly is made up of electronic switch IC6 and relay K A.When the high potential of each faulty circuit output arrived, the IC6 conversion made KA get electronic work, and its normally closed interlock separately discharges contactor, cuts off the load circuit power supply, has played various protective effects.

Display circuit A7 mainly is made up of controllable silicon and optical display unit and resistance-capacitance circuit.When the high potential of each faulty circuit output arrives, make its controllable silicon conducting of corresponding one tunnel, optical display unit is bright, and keeps, and resets up to higher level's power remove or when starting once more.

The experimental rig (see figure 2): it is made up of test button SB and test resistance SR and the wire turn on zero sequence current mutual inductor.After the energized, push test button, contactor discharges, and illustrates that leakage protection circuit is normal, makes regular check on it, to guarantee safe operation.

The remote control situation:

Be arranged on the Remote Control Interface (see figure 4) of main control circuit: draw lead to binding post in starting with A, B, C, the D place of latching circuit respectively.A, B are used for the normally open contact of external composite set, and C, D connect normally closed interlock.Like this, composite set can be by the opening and closing of its contact remote control the utility model contactor.If do not connect composite set, then C, D short circuit.

Be arranged on the Remote Control Interface (see figure 5) of electronic control circuit: draw lead to terminals at E, the F of executive circuit IC6 or F, G place respectively.The normally open contact of E, the external composite set of F, F, G connect the signal of telecommunication of composite set.They can discharge by the remote control contactor.

Enforcement of the present utility model can make the updates such as QC series electromagnetic starter, ES-7.5 magnetic starter of present use.

Claims

1, a kind of electronic type combined starter, it comprises:

Contactor is used to connect and the disjunction load power supply of motor particularly;

Control circuit is made up of main control circuit, electronic control circuit and remote control interface circuit, is used for the adhesive and the release of control contactor, and the display circuit situation;

Current transformer is used to follow the tracks of load current, as the sampling element of overload, short circuit and open-phase fault;

Zero sequence current mutual inductor is used for the whole phases of load (line) electric current, as the sampling element of electric leakage, shock current;

Experimental rig, whether be used to make regular check on the electric leakage control system normal;

Of the present utility modelly be characterised in that it is combined into one contactor, control circuit, current transformer, zero sequence current mutual inductor, experimental rig.

2, electronic type combined starter according to claim 1 is characterized in that: described contactor can be common A.C. contactor, can be the economize on electricity A.C. contactor, also can be the A.C. contactor of DC control.

3, electronic type combined starter according to claim 1, it is characterized in that: described main control circuit, form by manual operation button, contactor latching circuit and relay normally closed interlock, its power supply can be an AC power of directly taking from main circuit, also can be by the DC power supply of contactor type configuration rectification circuit.

4, electronic type combined starter according to claim 1, it is characterized in that: described electronic control circuit, it comprises overload, short circuit, phase shortage, electric leakage discriminator circuit, overvoltage, under voltage sampling discriminator circuit and their time-delay, triggering, display circuit and common executive circuits separately.

5, electronic type combined starter according to claim 1, it is characterized in that: described remote control interface circuit, one is provided in a side of main control circuit, by drawing in starting button two ends and the latching circuit, another is arranged on electronic control circuit, is drawn by executive circuit input and power end thereof.