CN2275769Y - Overvoltage protector for random reactive compensator - Google Patents

Abstract

The utility model relates to an over voltage protector for a random reactive compensator. The utility model comprises a power rectifier, a voltage stabilizer, a comparator, a delayer, a controller, and an actuator. The circuit of the utility model is characterized in that the over voltage protector adopts a comparison method for controlling the peeking out loop of a random reactive compensator, and the random reactive compensator is stopped; when the voltage is stepped down to a normal value, the random reactive compensator can automatically enter the loop for working and operating after 3-5 minutes. The problem of the harm of the compensator caused by that the electric network voltage is too high can be solved, the service life of the compensator can be extended, the compensator can be reliably and safely operated, and the generated interference for the electric network can be avoided.

Description

A kind of over-pressure safety device of reactive-load compensator at random

The utility model relates to a kind of over-pressure safety device of reactive-load compensator at random, and this device is made up of rectifier power source, pressurizer, comparator, delayer, controller and actuator etc.

Reactive-load compensator always moves under fully loaded load when connecting system is worked at random, and only when voltage or frequency fluctuation, load just has change slightly.Voltage has surpassed the limit of regulation if be in operation, and will shorten its life-span, therefore must strict its service conditions of control.For this reason, my company has developed overvoltage protection, and its principle is to adopt comparison method to control the loop that cuts out of reactive-load compensator at random, makes it out of service, after voltage drops to normal value, drops into the loop works operation again automatically in the time of 3-5 minute.

The purpose of this utility model is to provide a kind of over-pressure safety device of reactive-load compensator at random, and this device can guarantee that reactive-load compensator cuts off automatically at random when circuit surpasses rated voltage, and drops into the loop works operation after 3-5 minute automatically in time-delay.

The utility model above-mentioned purpose is finished like this.

A kind of over-pressure safety device of reactive-load compensator at random; this protective device comprises rectifier power source, pressurizer, comparator, delayer, controller and actuator; the commutating voltage that it is characterized in that said protective device is by step-down transformer B, rectifier ZL, capacitor C ₁Form, transformer is pressed A, B phase power supply respectively, rectifier ZL output termination pressurizer input and resistance R ₄An end,

Pressurizer is by regulator block IC ₁And capacitor C ₂, C ₃Form regulator block IC ₁Input termination rectifier ZL output, regulator block IC ₁Output is supply power voltage and reference voltage,

Comparator is by IC _2-1Integrated package, resistance R ₁, R ₂, R ₃, R ₄, R ₅, R ₆And diode D ₂Form R ₁One termination output end of voltage stabilizer, R ₂One end ground connection, its dividing potential drop and IC _2-1Negative input end connect R ₄One end links to each other R with rectifier ZL output ₃One end ground connection, its dividing potential drop and IC _2-1Positive input terminal connect,

Life-prolonging device is by IC _2-2Integrated package, resistance R ₇, R ₈, R ₉, R ₁₀, capacitor C ₄With diode D ₁Form diode D ₁Negative terminal meet IC _2-1Output, positive termination IC _2-2Positive input terminal, R ₇The output of termination pressurizer, R ₈One end ground connection, its minute crimping IC _2-2Negative input end,

Controller is by diode D ₃, triode G, relay J ₁Form D ₃Negative terminal meet IC _2-2Output, the base stage of positive termination G, J ₁The output of a termination pressurizer, the other end is pressed the collector electrode of G, the grounded emitter of G,

Actuator is by relay J ₁Normally closed contact J _1-1Form J with A.C. contactor KC _1-1The B of an end and power supply link to each other, the other end is communicated with the coil of A.C. contactor KC, the other end of coil is connected mutually with the C of power supply.

The course of work of protective device provided by the utility model is as follows:

Energized is through step-down transformer B step-down, rectifier ZL rectification and capacitor C ₁Divide two-way after the filtering:

One the tunnel through IC ₁Ic chip is supplied with in the regulator block voltage stabilizing _2-1, IC _2-2With controller power source and ic chip _2-1, IC _2-2Reference voltage.

Another road is as signal voltage.

IC _2-1Be hysteresis comparator, produce shake in order to prevent output.

When power supply just often, D point current potential is lower than E point current potential in the circuit, IC ₁The output electronegative potential, IC ₂No-output G does not work, relay J ₁Do not work A.C. contactor KC work, the compensator work that puts into operation yet.

When supply voltage greater than rated operational voltage U _n1.1 in the time of doubly, D point current potential is than E point current potential height, IC _2-1The output high potential, IC _2-2Also export high potential and make G conducting work, make J ₁Work, J _1-1Cut off KC, it is not worked, make compensator cut out the loop.

When supply voltage dropped to normal value, D point current potential was lower than E point current potential again, IC _2-1No-output, but because capacitor C ₄Current potential is that stabilized voltage power supply voltage F point current potential is still than K point current potential height, IC _2-2Still have output, triode G and relay J ₁Still work, but A.C. contactor KC does not work.

Work as C ₄Through R ₉Discharge after 3-5 minute, when F point current potential is lower than K point current potential, IC ₂No-output causes triode G and relay J ₁Do not work J _1-1Connection makes KC work, and compensator is devoted oneself to work again automatically.

Charging voltage is the stabilized voltage power supply magnitude of voltage, so F point current potential is still than K point current potential height, IC _2-2Still have output, G, J ₁Still work J _1-1Disconnect, KC does not work, and makes the compensator operation of can not devoting oneself to work.Has only the capacitor C of working as ₄Charging voltage through R ₉After the discharge in 3-5 minute, when F point current potential is lower than K point current potential, IC _2-2The ability no-output, G promptly ends, J ₁Dead electricity makes J simultaneously _1-1Normally closed contact is connected, KC work, and compensator puts into operation again.

Protective device provided by the utility model has solved the harm that brings to compensator when line voltage is too high, has prolonged the useful life of compensator, make compensator can be reliably, operation safely, and can avoid compensator that electrical network is caused interference.

Introduce the utility model specific embodiment below in conjunction with accompanying drawing.

Fig. 1 is a frame principle figure of the present utility model.

Fig. 2 is a circuit diagram of the present utility model.

In the present embodiment, rectifier power source, pressurizer, comparator, delayer, controller and the actuator's integral installation be made up of above-mentioned electric elements fit on the wiring board, can be made into indoor and outdoor two kinds of type products according to use occasion.When this product is used for the open air, its housing should be made the insulative water-proof type.The model of above-mentioned electric elements can adopt the electric elements of respective model according to the rated voltage size of setting, and related content can not repeat them here referring to existing relevant books.

Claims (1)

1. reactive-load compensator over-pressure safety device at random; this protective device comprises rectifier power source, pressurizer, comparator, delayer, controller and actuator; the commutating voltage that it is characterized in that said protective device is by step-down transformer B, rectifier ZL, capacitor C ₁Form, transformer connects A, B phase power supply respectively, rectifier ZL output termination pressurizer input and resistance R ₄An end,

Pressurizer is by regulator block IC ₁And capacitor C ₂, C ₃Form regulator block IC ₁Input termination rectifier ZL output, regulator block IC ₁Output is supply power voltage and reference voltage,

Comparator is by IC _2-1Integrated package, resistance R ₁, R ₂, R ₃, R ₄, R ₅, R ₆And diode D ₂Form R ₁One termination output end of voltage stabilizer, R ₂One end ground connection, its dividing potential drop and IC _2-1Negative input end connect R ₄One end links to each other R with rectifier ZL output ₃One end ground connection, its dividing potential drop and IC _2-1Positive input terminal connect,

Delayer is by IC _2-2Integrated package, resistance R ₇, R ₈, R ₉, R ₁₀, capacitor C ₄With diode D ₁Form diode D ₁Negative terminal meet IC _2-1Output, positive termination IC _2-2Positive input terminal, R ₇The output of one termination pressurizer, R ₈One end ground connection, its minute crimping IC _2-2Negative input end,

Controller is by diode D ₃, triode G, relay J ₁Form D ₃Negative terminal meet IC _2-2Output, the base stage of positive termination G, J ₁The output of a termination pressurizer, the other end is pressed the collector electrode of G, the grounded emitter of G,

Actuator is by relay J ₁Normally closed contact J _1-1Form J with A.C. contactor KC _1-1The B of an end and power supply link to each other, the other end is communicated with the coil of A.C. contactor KC, the other end of coil is connected mutually with the C of power supply.

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