CN2044388U

CN2044388U - Three function protective switch

Info

Publication number: CN2044388U
Application number: CN 89210114
Authority: CN
Inventors: ***; 佟秀林
Original assignee: Individual
Current assignee: Individual
Priority date: 1989-02-02
Filing date: 1989-02-02
Publication date: 1989-09-13

Abstract

The utility model relates to a three-function protective switch which is composed of a sample circuit, a processing circuit, a storage and display circuit, an operating mechanism and a system reset mechanism. After a fault signal is sampled, the fault signal is sent to the processing circuit to output a trigger signal, the trigger signal is sent to the thyristor control pole of the storage and display circuit to conduct a thyristor, and the LED stores and displays the fault. Simultaneously, a signal is provided for triggering the thyristor control pole of the operating mechanism so that a trip works to drive contacts J1 and J2 to be switched off, and therefore, the power supply is cut off. When the accident is eliminated, the system resets to supply the power again. The utility model has the advantages of simple structure, high reliability and convenient operation and installation.

Description

Three function protective switch

The utility model belongs to the protective device of electric equipment.

In order to prevent owing to load end uses the over-current phenomenon avoidance that takes place accidentally, for many years generally employing be the knife switch that has fuse.It is that load current surpasses the moment of definite value, makes the fuse quick-break when short circuit or overload appear in electric equipment, realizes opening circuit, and the protection electric equipment is not destroyed, prevents electrical fire.After this knife switch opens circuit, need to get rid of the fault that causes overcurrent by operating personnel, change new fuse then, could continue power supply, the shortcoming of being brought is to change the fuse trouble, can not restore electricity rapidly, and, be easy to take place electric shock accidents because live part is exposed easily.

The purpose of this utility model provides a kind ofly can cut off the power supply when electric accidents such as overcurrent, overvoltage, electric leakage take place automatically, and fault is easy to restore electricity after getting rid of, and is difficult for the multi-function protector that gets an electric shock.

The utility model is achieved in that

It is made up of sample circuit, treatment circuit, storage display circuit, actuator and system reset, sample circuit comprises the leakage current sampling, overcurrent sampling and overvoltage sampling, treatment circuit comprise that leakage current is handled, overcurrent is handled and overvoltage is handled.When leakage current takes place, the power line that passes instrument transformer CT makes secondary coil L ₁Produce induced potential; When overcurrent takes place, pass instrument transformer CT ₀Power firestreak make secondary coil L ₂Induction changes; When the overvoltage generation, voltage divider provides voltage signal.Treatment circuit provides the SCR control utmost point that triggering signal is delivered to the storage display circuit, triggers the controllable silicon conducting, and the storage that light-emitting diode carries out fault shows; Provide the SCR control utmost point of signal code triggering actuator simultaneously by the controllable silicon output of storage display circuit, controllable silicon conducting, the release work of actuator, contact-actuating J ₁, J ₂, J ₃Disconnect, cut off the electricity supply.After accident was got rid of, system reset restored electricity.

The utility model is suitable for electricity consumption places such as dwelling house, workshop, office, school; have earth leakage protective, overcurrent protection and three kinds of functions of overvoltage protection; can prevent because the loss of life or personal injury that various electric accidents such as electric shock, short circuit, overload and overvoltage cause device damage reliably.It is simple in structure, and good reliability is installed, and is easy to use.

Accompanying drawing 1 is circuit theory diagrams of the present utility model.

Accompanying drawing 2 is an outer mold surface plate structure schematic diagram of the present utility model.

Leakage current sampling is that primary coil (being power line) as instrument transformer CT is when unsymmetrical current occurring, at secondary coil L ₁And capacitor C ₂The induced voltage of last generation 0.5～0.9V, the diode D of the treated circuit of this induced voltage ₅And capacitor C ₃After the filtering, obtain the controllable silicon SCR that triggering signal is delivered to the storage display circuit ₁The control utmost point, controllable silicon SCR ₁Conducting, LED ₁Light and provide the leakage current demonstration.The while controllable silicon SCR ₁Cathode (being output) trigger the controllable silicon SCR of actuator ₄Conducting trip coil TK has electric current to pass through, and inhales the armature contact-actuating J of moving release ₁J ₂, J ₃Disconnect, cut off the electricity supply.The overcurrent sampling is when the electric current in the power line changes, and causes instrument transformer CT ₀Secondary coil L ₂Induced potential intensity change, at secondary coil L ₂And capacitor C ₄The induced voltage of last generation 0.5～2.5V, the diode D of the treated circuit of this induced voltage ₆Detection, capacitor C ₅After the filtering, obtain forward voltage, send resistance R ₄And capacitor C ₆Carry out the integration time-delay, then in the threshold values resistance R ₅And controllable silicon SCR ₂The triggering signal that obtains of the control utmost point, make controllable silicon SCR ₂Conducting, LED ₂Light, provide overcurrent and show.Trigger actuator's work simultaneously.Malfunctioning in order to prevent overcurrent protection, also adopt fuse RD to be connected in series to and be second level protection on the power firestreak.When improper high voltage appears in supply voltage, surpass when protecting rated voltage, by resistance R ₇And R ₆The voltage divider of forming was got piezoelectric signal, triggered controllable silicon SCR ₃The control utmost point, the controllable silicon conducting makes LED ₃Light, provide the overvoltage demonstration and trigger actuator's work.For preventing that instantaneous overvoltage from causing misoperation, uses resistance R ₇With capacitor C ₇Form integral element, voltage stabilizing didoe DZ is as reference power supply, it is bigger for well that the voltage stabilizing value of voltage stabilizing didoe should be selected, the storage display circuit is that controllable silicon is connected with light-emitting diode and joined, and it is by controllable silicon SCR that the release of actuator moves ₁～SCR ₃With resistance R ₂The triggering signal of forming that OR circuit provided, the conducting controllable silicon SCR ₄, make release work.

The utility model also is provided with the leakage tests circuit, and it is by resistance R ₃With K switch ₂Form, system reset is by K switch ₁Finish, work as K ₁Press (opening state), system cut-off, SCR ₁～SCR ₃Disconnect simultaneously, or the output of door no signal, SCR ₄Also disconnect, when user's using electricity system breaks down, if do not fail to carry out system reset after not getting rid of or getting rid of, this protection switch closes not brake application, resistance R ₁Be current-limiting resistance, D ₁～D ₄Be rectifier bridge, C ₁Be filter capacitor.Instrument transformer CT secondary coil L ₁The number of turn is 600～2000, instrument transformer CT ₀Secondary coil L ₂The number of turn is 500～2500, and the number of turn of trip coil TK is 800～3000.

Claims

1. a function and protecting switch is made up of sampling, processing, storage display circuit, actuator and system reset, it is characterized in that:

A, sample circuit comprise leakage current sampling, overcurrent sampling and overvoltage sampling, and when leakage current takes place, the power line that passes instrument transformer CT makes secondary coil L ₁Produce induced potential; When overcurrent is passed instrument transformer CT ₀Power firestreak, make secondary coil L ₀Induction changes; When the overvoltage generation, voltage divider provides voltage signal.

B, treatment circuit provide triggering signal to the SCR control utmost point that stores display circuit, the controllable silicon conducting, and light-emitting diode carries out the fault storage and shows; Provide the SCR control utmost point of signal code triggering actuator simultaneously by the controllable silicon output of storage display circuit, controllable silicon conducting, the release work of actuator, contact-actuating J ₁, J ₂, J ₃Disconnect.

2. according to the described three function and protecting switches of claim 1, it is characterized in that said overcurrent has also adopted fuse R _DBe connected in series to and be second level protection on the power firestreak.

3. according to the described three function and protecting switches of claim 1, it is characterized in that said storage display circuit is that controllable silicon is connected with light-emitting diode and joined.

4. according to the described three function and protecting switches of claim 1, it is characterized in that said instrument transformer CT secondary coil L ₁The number of turn is 600～2000, instrument transformer CT ₀Secondary coil L ₂The number of turn is 500～2500, and the number of turn of trip coil TK is 800～3000.