CN2165556Y

CN2165556Y - All-purpose automatic protection switch for motor

Info

Publication number: CN2165556Y
Application number: CN 93221093
Authority: CN
Inventors: 林清峰
Original assignee: YUANDONG ELECTRIC APPLIANCE FACTORY SHEQI COUNTY HENAN PROV
Current assignee: YUANDONG ELECTRIC APPLIANCE FACTORY SHEQI COUNTY HENAN PROV
Priority date: 1993-08-10
Filing date: 1993-08-10
Publication date: 1994-05-18
Anticipated expiration: 2003-08-10

Abstract

The utility model relates to the technical field of an electric switch, which provides an all-purpose automatic protection switch for a motor. The all-purpose automatic protection switch for a motor is mainly characterized in that a tank circuit, a phase interruption protection circuit, and an overload and excess voltage protection circuit are additionally arranged in the existing electrical leakage and short-circuit protection switch. Thus, the all-purpose automatic protection switch for a motor increases the power-off protection functions of phase interruption, overload, excess voltage, and automatic shutdown when power failure happens for the motor. The utility model is increased with the six protection functions of electrical leakage, short circuit, phase interruption, overload, excess voltage, and automatic shutdown when power failure happens on the basis of the two protection functions of electrical leakage and short circuit. As long as the utility model is started, if faults appear, the utility model can realize automatic power off. The all-purpose automatic protection switch for a motor is convenient in use. Compared with the prior art, the utility model has the obvious advantages.

Description

All-purpose automatic protection switch for motor

The utility model belongs to the electric switch technical field, is a kind of motor global function Automatic Protection Switching.

Existing leak electricity short-circuit protection switch can only be protected motor electric leakage and short circuit, and to the phase failure, overload, under-voltage operation and the power failure unprotect ability of motor.

Purpose of design of the present utility model is a kind of can the protection the leak electricity short-circuit of motor of design, again the motor global function Automatic Protection Switching that can protect the phase failure, overload, under-voltage operation and the power failure of motor.

The utility model motor global function Automatic Protection Switching, the technical measures of being taked are to set up accumulator, open-phase protection circuit, overload under-voltage protecting circuit in the shell of existing leak electricity short-circuit protection switch, reach the purpose of this utility model.

This motor global function Automatic Protection Switching of the present utility model.1, owing to set up accumulator, shutdown function automatically can realize having a power failure; 2, owing to set up open-phase protection circuit, can carry out the phase failure to motor rotation and detect, the motor open-phase running is carried out power-off protection; 3, owing to set up open-phase protection circuit and overload under-voltage protecting circuit, can transship under-voltage detection to the under-voltage running of the overload of motor, power-off protection is carried out in under-voltage operation to motor overload.By setting up foregoing circuit, the motor phase failure, overload, under-voltage operation have been increased and the shutdown defencive function that has a power failure.

Reach the architectural feature of case introduction the utility model motor global function Automatic Protection Switching in conjunction with the accompanying drawings.

Accompanying drawing is represented the structural representation and the electrical schematic diagram of the utility model motor global function Automatic Protection Switching.

Referring to accompanying drawing, the utility model motor global function Automatic Protection Switching by: leak electricity short-circuit protection switch and the accumulator that increases in its shell, open-phase protection circuit, overload under-voltage protecting circuit are formed.

Wherein, the leak electricity short-circuit protection switch comprises: circuit breaker K1, button K2, R6, short circuit control release M1, M2, M3, electric leakage control release M4, zero sequence current mutual inductor B5, the bridge rectifier that diode D5-D8 forms, controllable silicon SCR 2, capacitor C 4.

The bridge rectifier that accumulator is made up of diode D9-D12, the normally closed interlock J1 of capacitor C 5 and electromagnetic relay J, moving contact J2, normally open contact J3 forms.Be connected with the leak electricity short-circuit protection switch; J2, C5 are anodal to be connected with SCR2 is anodal; J1 is connected with the SCR2 negative pole; J3 is connected with the rectifier bridge output cathode; the C5 negative pole connects with electric leakage control trip coil one end (a non-end that is connected with the SCR2 negative pole) with the rectifier bridge negative pole, and mains supply connects the input of D9-D12.Connect circuit breaker K1, relay J 2, J3 closure, D9-D12 is to the mains supply rectification, capacitor C 5 filtering energy storage.When having a power failure, relay J no current and discharging, J2, J1 closure, the electric energy of last storages of C5 makes electric leakage control release M4 produce the action of threading off, and circuit breaker K1 is resetted, and cuts off the electricity supply, the automatic shutdown.

Open-phase protection circuit is by magnetic ring transformer B1, the B2, the B3 that are together in series with end of the same name and the different name end mode of linking to each other, the bridge rectifier that diode D1-D4 forms, and capacitor C 1, the indicating circuit that works well that electromagnetic relay J and R2, LED2 form is formed.Diode D1-D4, the DC power supply behind the C1 rectifying and wave-filtering is as the main power source of relay coil and overload under-voltage protecting circuit, and when motor ran well, relay J 1, J2 disconnected, J2, J3 closure, electric leakage control magnetic release M4 non-transformer is failure to actuate.When the motor phase shortage turned round, corresponding non-inductive voltage of magnetic ring transformer and generation metering function made the power supply no-output, and the relay J non-transformer discharges, J2, J3 disconnect, J1, J2 closure, and electric leakage control release M4 connects accumulator, produce the action of threading off, circuit breaker K1 is resetted, cut off the electricity supply.

The overload under-voltage protecting circuit is by magnetic ring transformer B4; diode D13; D14; resistance R 1; R3; R4; R5; variable resistance W1; W2; capacitor C 2; C3; LED 1; triode BG1; BG2; controllable silicon SCR 1 is formed; its power supply is supplied with by open-phase protection circuit; B4; D13; C2 forms the halfwave rectifier filter circuit; do the BG1 input control signal through W1; under the rated current of setting; regulating W1 makes BG1 be in critical conduction mode; R1; R3 is BG1 biasing and load resistance; BG2; W2; C3; R4 forms active integrating circuit; D14; R5, the circuits for triggering of composition SCR1 are when the motor overload electric current increases overrate; the linear conducting of BG1; its emitter current potential raises, and the BG2 conducting is saturated to integrating circuit C3; R4 charging, BG2 emitter current potential slowly raise (overload time-delay); when the puncture voltage that surpasses voltage stabilizing didoe D14; controllable silicon SCR 1 conducting that is triggered, relay is discharged by the short circuit non-transformer, and electric leakage control release M4 connects accumulator and produces the action of threading off; circuit breaker K1 is resetted, cut off the electricity supply.

Constant in load, when supply voltage descends, electric current will increase, and in like manner by overload protecting circuit circuit breaker K1 be resetted, and cutting off the electricity supply reaches the under-voltage protection purpose.

During use; the utility model switch series is inserted in the power line of threephase asynchronous machine; circuit breaker K1 closes; motor runs well, and LED2 is luminous, when motor overload or under-voltage running; LED1 is luminous; indication motor is in overload or under-voltage running, and when motor overload or under-voltage when surpassing certain limit, circuit breaker K1 automatically resets; cut off the electricity supply; electric leakage appears in motor operation course; short circuit; during situation such as the phase failure and power failure, circuit breaker K1 also can automatically reset and cut off the electricity supply, thus the safety of the protection person and equipment; during shutdown; press button K2, circuit breaker K1 resets, and cuts off the electricity supply.

Claims

1, a kind of motor global function Automatic Protection Switching has the leak electricity short-circuit protection switch, it is characterized in that also having additional in the shell of leak electricity short-circuit protection switch accumulator, open-phase protection circuit, overload under-voltage protecting circuit;

Wherein, accumulator is by D9-D12, and C5, J1, J2, J3 link composition, after energising, and J2, J3 closure, the all-wave voltage after the bridge rectifier rectification of being made up of D9-D12 is through C5 filtering energy storage;

Wherein, open-phase protection circuit is linked by B1, B2, B3, D1, D2, D3, D4, C1, J, R2 and LED2 and forms, after energising, all-wave voltage after the bridge rectifier rectification that D1-D4 forms is after C1 filtering, be added on the solenoid of J, J1, J2 disconnect, J2, J3 closure, LED2 does to work well indication, when the motor phase shortage turns round, the corresponding non-inductive voltage of magnetic ring transformer and metering function is arranged, the rectification circuit no-output, J discharges, J1, J2 closure, J2, J3 disconnect, electric leakage control release M4 action, drive circuit breaker K1 and reset, cut off the electricity supply;

Wherein transship under-voltage protecting circuit by B4; LED1; D13; D14; C2; C3; R1; R3; R4; R5; W1; W2; BG1; BG2 and SCR1 link and form; make power supply with the voltage behind the open-phase protection circuit rectifying and wave-filtering; through B4; D13; voltage behind the half-wave rectifying circuit rectifying and wave-filtering that C2 forms; through W1; make the input control signal of BG1; and make BG1 when rated current, be operated in critical conduction mode; behind the electric current overrate; the linear conducting of BG1, BG2 saturation conduction, C3; the R4 charging; after surpassing the puncture voltage of zener diode D14; the SCR1 saturation conduction, the solenoid of J is because of short circuit release relay contact, J2; J3 disconnects; J1; the J2 closure; electric leakage control release M4 action drives circuit breaker K1 and resets, and cuts off the electricity supply.