CN2205075Y - Solid phase breaking off protecting relay - Google Patents

Abstract

The utility model discloses a solid phase failure protective relay, which has the advantages that efficiency is high, conducting pressure drop is small, input and output stages are completely insulated, a dv/dt change rate can reach 600V / mu s, load still obtains complete simple alternating current under the condition of inductive load; the solid phase failure protective relay has no pollution to an electric network, and a contactor stably works. The utility model is the small solid three-phase motor protector with reliable performance and advanced technology.

Description

Solid phase breaking off protecting relay

The Owl utility model relates to the solid-state phase failure relay of a kind of electric motor protective device, particularly a kind of three phase electric machine.

Industrial and agricultural production and civilian motor in use three phase electric machine to burn winding be common faults, trace it to its cause, majority is due to the open-phase running.At present, domestic also have a three phase electric machine phase failure protector series products, and from product structure, this class protector is most to be made for discrete original paper and bidirectional triode thyristor.Be with in alternating current circuit that waveform has serious distortion under inductive load (as the A.C. contactor) situation, not only for electrical network pollution arranged, contactor work is unsurmountable drawback such as instability also, and these drawbacks absorb network with simple RC and can't resolve at all.In a word, existing three-phase motor protector series products poor performance, technology are advanced inadequately.

It is simply novel that the purpose of this utility model is to design a kind of circuit, dependable performance, the three phase electric machine phase failure relay of the undistorted solid state of output waveform.

The purpose of this utility model is achieved in that a kind of solid-state phase failure relay; it is characterized in that: be by three-phase phase failure monitoring level; controlled stage and power output stage are formed; wherein the output of the solid-state relay ICSSR in the power output stage connects the 380V power supply by contactor KA, and "+" input of ICSSR passes through resistance R ₅Connect direct current output "+" end of bridge rectifier, the collector electrode of "-" input termination controlled stage triode VT of ICSSR, the emitter of VT connects the negative pole of bridge rectifier, and the base stage of VT meets series resistance R in the phase failure monitoring level ₃, R ₄Tie point, R ₃The other end by rectifier diode VD ₆Reach parallel resistance, electric capacity R ₂, C ₂Connect motor C phase, A, the B phase of the input termination motor of rectifier bridge.

The utility model is described in further detail below in conjunction with drawings and Examples:

Fig. 1 is solid-state phase failure relay power supply reason figure.

Fig. 2 is the utility model wiring schematic diagram.

As shown in Figure 1, three-phase alternating current phase failure monitoring and internal electric source, phase failure control signal is compatible with one dexterously, makes circuit simple, and element is few, reliable operation.Among the figure because A, B phase (irrelevant) with phase sequence as the bridge rectifier power source, behind voltage regulation filtering as the base control signal of VT, so as long as arbitraryly disconnect mutually, VT just ends, ICSSR no-output contactor KA dead electricity and discharging, motor and power supply hightail, thereby have prevented the motor open-phase running.

Power output stage of the present utility model adopts zero passage matrix switch power ICSSR(solid-state relay).This device adopts S ³The new technology of X, and IC internal power output stage is MOSFET, so it not only have traditional life-span that SSR had long, input power is low, advantages such as response is fast, EMI disturbs little, reliable operation also have characteristics such as better dv/df rate of change (600V-1200V/ μ S) and output be linear splendid.Under the situation of inductive load, observe through oscilloscope, without any wave distortion, and the break-over of device pressure drop very little (＜3V), this device is a photoelectric coupling type, input and output are isolated (insulating greater than 4KVAC) fully.

These characteristics is for miniaturization, and the solid state design is very favourable, solidifies design owing to adopt, thus but effectively moistureproof, shockproof, dustproof, continuous operation in abominable working environment. Be not difficult to find out that by above characteristics the utility model modern design, circuit is simple, volume is little, in light weight, dependable performance, advanced technology, low cost and other advantages, is a kind of technology maturation, is easy to the solid state electrode protection class new product of producing and popularizing.

Claims (1)

1, a kind of solid-state phase failure relay; it is characterized in that: be by three-phase phase failure monitoring level; controlled stage and power output stage are formed, and wherein the output of the solid-state relay ICSSR in the power output stage connects the 380V power supply by contactor KA, and "+" input of ICSSR passes through resistance R ₅Connect direct current output "+" end of bridge rectifier, the collector electrode of "-" input termination controlled stage triode VT of ICSSR, the emitter of VT connects the negative pole of bridge rectifier, and the base stage of VT meets series resistance R in the phase failure monitoring level ₃, R ₄Tie point, R ₃The other end by rectifier diode VD ₈Reach parallel resistance, electric capacity R ₂, C ₂Connect motor C phase, A, the B phase of the input termination motor of rectifier bridge.