CN87210350U - Phase sequence and phasefailure protective relay - Google Patents

Abstract

The utility model discloses a phase sequence and phasefailure protective relay which is formed by a plurality of resistors matched with a capacitance. A phase-sequence indicator (1) which is composed of a plurality of resistors, the capacitance and a neon lamp is served as a detecting device. The neon lamp and a photoelectric tube are made up of a photocoupler (2) which is served as the photoelectric conversion to make the final control relay (4) act by an amplifier (3) with the signal displaying. The relay not only has the relay effect when any phase of the three-phase alternating-current supply is interrupted, but also has the relay effect to the control system which has requirement to the phase sequence (the positive sequence or the negative sequence) of the supply or the alternating-current transmission system which is not allowed to reverse.

Description

Phase sequence and phasefailure protective relay

The utility model name is called phase sequence and phase failure dual-purpose protection relay, belongs to the relay control device field, is a kind of improved protective relaying device, and particularly a kind of have requirement to power phase (positive sequence or backward), and the protective relaying device of phase failure dual-purpose.

In the prior art, when moving, in time find consequently to burn motor, adopted phase failure relay usually, control protection owing to the phase failure in order to prevent motor.Lead step motor single phasing protection device as China BDY7012-11Q; it mainly by three supply lines of motor, passes three pulse transformers that volume is bigger, its secondary winding; be connected on the negative AND circuit; when motor normally moved, the line current phase angle difference was 120 °, and pulse can not appear in pulse transformer simultaneously; so negative AND circuit is obstructed; negative OR circuit is not exported pulse signal, and relay is failure to actuate, and machine is operation as usual.When single-phase motor running, the electric current phase angle difference of two wires is 180 °, and pulse transformer produces spike, the overlapping phenomenon occurs, and then negative AND circuit is opened, and negative OR circuit output pulse signal triggers monostable circuit and the actuating of relay, and machine shuts down.The open phase relay of another kind of DDX-1 type mainly is made up of negative sequence voltage sequence filter and two heavy elements such as electromagnetic relay, finishes the relaying protection effect of the phase failure.And when some alternating-current actuating system, require the phase sequence of its feed, need meet certain phase sequence (positive sequence or backward) requirement, as in textile machine, using the contactless gap switch of bobbin-winding machine very widely, for requiring to guarantee that phase sequence is correct, be provided with specially electronics phase-sequence indicator regulation neon lamp represent when bright phase sequence not to and need line transfer commutation preface, otherwise can burn bidirectional triode thyristor, do not have the effect of gap switch.Some alternating-current actuating system for another example, the mechanical part that is dragged, strictness forbids counter-rotating or under some occasion, need latch phase sequence (covert preface when preventing to send electricity again again), all needing a kind ofly has the relay system of reflection to give interlocking and signal to phase sequence.So above-mentioned two kinds of protection relays, all can not finish these work, and complex structure, valency height, volume are greatly comparatively outmoded, and do not have signal display unit, can not reminds people, carry out on-call maintenance.

Task of the present utility model; be that a kind of improved protection relay will be provided; it is not only to there being relay effect during the arbitrary phase phase failure in the three-phase alternating-current supply; and the phase sequence (positive sequence or backward) of power supply there is a control system of requirement; perhaps do not allow the alternating-current actuating system that reverses; relay effect is also arranged, and signal display unit is arranged.

Task of the present utility model is finished as follows, and it is by phase-sequence indicator 1, photoelectrical coupler 2, and amplifier 3 and execution relay 4 four parts are formed.In the three-phase alternating voltage more than 120 volts, the phase-sequence indicator that is complementary and is formed with neon lamp by resistance, electric capacity is as checkout gear; change by photoelectrical coupler; after amplifying, carry out the actuating of relay and the protective relaying device finished, and have signal light to show.

Below, will be in conjunction with the accompanying drawings, the utility model is described in further detail.

Fig. 1 is an electrical schematic diagram of the present utility model

Fig. 2 is the photoelectrical coupler figure that neon lamp of the present utility model and photoelectric tube are formed

With reference to Fig. 1, Fig. 2, one is R by three same resistance values resistance 5,6,7 and electric capacity 8 are complementary, and neon lamp 9 both end voltage is equalled zero, and consist of phase-sequence indicator 1 with neon lamp 9, the capacitive reactance of electric capacity

$Z_C=\frac{1}{\sqrt{3}}R$

, in 380 volts of voltages of three-phase alternating current, when R=200K, Z _C=0.033 μ f, when three-phase alternating-current supply A-B-C became positive sequence, because the both end voltage of neon lamp 9 equals zero, neon lamp did not work.The photoelectrical coupler of being made up of neon lamp 9 and photoelectric tube 10 is placed in the box 11 jointly, be filled with insulation packing 12 therebetween, when neon lamp 9 does not work, photoelectric tube 10 no currents then, triode 13 ends, triode 14 conductings, thereby light-emitting diode 15 is bright, then carry out relay 4 adhesives, machine runs well, and when three-phase alternating-current supply becomes the A-C-B backward, perhaps in the three-phase during the arbitrary phase phase failure (as disconnected A phase), then neon lamp 9 two ends produce voltage and neon lamp 9 is bright, thereby photoelectric tube 10 has electric current to pass through, then triode 13 conductings, 14 end, so light-emitting diode 15 does not work, discharge and carry out relay 4, machine is shut down, and again can not drive car, this device can be made case type, and perhaps circuit is board-like, and the above-mentioned two kinds of existing product volumes of its volume ratio can dwindle about 1/2.

In addition, its phase sequence can make the positive sequence adhesive as required, also can make the backward adhesive and all can play same relaying protection effect; and light-emitting diode 15 bright and extinguishing; can be used as the signal demonstration of the normal and fault of machine,, unlikelyly burn relevant components and parts with reminds people.

Claims (1)

1, drive system that alternating current motor is dragged; in three-phase during the arbitrary phase phase failure; the relay system of protecting; it is characterized in that: in 120 volts of above three-phase alternating voltages; have a phase-sequence indicator 1, photoelectrical coupler 2, amplifier 3 and carry out phase sequence and the phase failure dual-purpose protective relaying device that relay 4 is formed, phase-sequence indicator 1 is to be that resistance and the electric capacity of R is complementary by several same resistance values.Capacitor C ₁Capacitive reactance Z _C=

$Z_C=\frac{1}{\sqrt{3}}R$

, resistance R ₁, R ₂Be connected to A phase, B phase respectively, R ₁, R ₂The other end link to each other neon lamp 9 and R with the two ends of neon lamp 9 respectively ₁Common point connect C ₁An end, neon lamp 9 and R ₂Common point connect resistance R ₃An end, C ₁With R ₃The other end be connected to another phase C jointly, neon lamp 9 consists of photoelectrical coupler 2 with photoelectric tube 10, deposit in jointly in the box 11, be filled with the packing 12 of insulation therebetween, in the amplifier 3, the former limit of transformer 16 connect respectively B mutually with C mutually, (or other two-phases), pay the input of edge joint rectifier 17, capacitor C ₂In parallel with the output of rectifier 17, C ₂Negative pole pass through resistance R ₈Link to each other 19 positive pole and C with voltage-stabiliser tube 19 negative poles ₂Positive pole link to each other photoelectric tube 10 and resistance R ₄The series connection back is in parallel with voltage-stabiliser tube 19,10 emitter and R ₄Common point pass through resistance R ₅Connect the base stage of triode 13,13 collector and emitter passes through resistance R respectively ₇And R ₆Link to each other with negative pole with the positive pole of voltage-stabiliser tube 19,13 collector electrode links to each other with the base stage of triode 14 by light-emitting diode 15,14 collector electrode is by carrying out the positive pole that relay 4 is connected in voltage-stabiliser tube 19, and 14 emitter is connected to 19 negative pole, and is showed as signal by light-emitting diode 15.

Images