CN201038732Y

CN201038732Y - Electrical equipment protecting device

Info

Publication number: CN201038732Y
Application number: CNU2007201014295U
Authority: CN
Inventors: 王彦军
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-05-25
Filing date: 2007-05-25
Publication date: 2008-03-19
Anticipated expiration: 2017-05-25

Abstract

The utility model relates to an electric protecting device. Three phases of power supplying circuits are serially connected with the normally open contact of an alternating current contactor CJ; the coil spur track of the alternating current contactor is connected between two phases of power supplying circuits; the three input ends of a phase failure phase sequence protector are respectively connected with the three phases of power supplying circuits; the normally open contact of the phase failure phase sequence protector is serially connected on the coil spur track of the alternating current contactor; a voltage relay DY is respectively serially connected between each phase of circuit and the zero wire; the normally open contacts of the voltage relays are serially connected with the coil spur track of a middle relay ZJ after parallel connection; the contact parallel connected spur track of the voltage relay is still parallelly connected with a spur track which is serially connected with the normally open contact of the middle relay and a stopping switch TA; the coil spur track of the alternating current contactor is internally and serially connected with a switch KG and the normally closed contact of the middle relay. The utility model can protect the phenomena such as phase breaking, wrong connection of the phase wire and zero wire, or burnt zero wire and so on.

Description

Electric protective device

Technical field

The utility model relates to a kind of electric equipment power supply protection device, specifically a kind of electric protective device that is used for the three-phase four-wire low-voltage electric power system.

Background technology

Following phenomenon often takes place in the user in the supply line that uses the three-phase four-wire low-voltage electric power system: the one, and the phase sequence misconnection makes the electric equipment cisco unity malfunction or causes damage; The 2nd, phase line and zero line misconnection cause electric equipment to burn; The 3rd, zero line blows, and the three-phase load imbalance is burnt electrical appliance.The generation of these phenomenons has all caused very big economic loss for user and power supply enterprise.Conventional electric protective device generally is a normally opened contact that is connected in series A.C. contactor in three-phase power line respectively, and the path of winding of A.C. contactor and action element of being correlated with and switch etc. are connected between the two-phase supply line.The defencive function of this class protective device is all not too comprehensive, for the electric equipment that has strict phase sequence to require, throws device etc. mutually as deep well pump, elevator and dual power supply, all can not implement protection when the phase sequence wrong usually, causes device damage.

The utility model content

The purpose of this utility model just provides and a kind ofly in supply line the phase failure, phase line and zero line misconnection or the disconnected multifunctional electric protective device that all can play a protective role when zero takes place.

The utility model is achieved in that a kind of electric protective device, in three-phase power line, be connected in series a normally opened contact of A.C. contactor respectively, the path of winding of A.C. contactor is connected between the two-phase supply line, three inputs of phase failure phase sequence relay join with three-phase power line respectively, and the normally opened contact of phase failure phase sequence relay is serially connected on the path of winding of A.C. contactor; Between every phase circuit of three-phase power line and zero line, be connected to a voltage relay respectively, be serially connected in the path of winding of auxiliary relay after each normally opened contact of three voltage relays is parallel with one another, the path of winding of auxiliary relay is connected between the two-phase supply line, the normally opened contact of a serial connection auxiliary relay also in parallel and the branch road of shutdown switch on three contact parallel branches of voltage relay; In the path of winding of A.C. contactor, also be serially connected with the normally-closed contact of switch and auxiliary relay.

Different situations such as the phase failure, phase line and zero line misconnection that the utility model takes place supply line or zero line blow all can play a protective role, and defencive function is many; And the utility model is not only applicable in the low-voltage power system of three-phase four-wire system, and after changing component parameter, also applicable to the high pressure open phase protection.

Description of drawings

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

Embodiment

As shown in Figure 1, the utility model is a normally opened contact CJ who is connected in series A.C. contactor CJ in A, B, C three-phase power line respectively ₁, CJ ₂, CJ ₃, the path of winding of A.C. contactor CJ is connected between A, the C two-phase supply line, and three inputs of phase failure phase sequence relay XJ join with A, B, C three-phase power line respectively, the normally opened contact XJ of phase failure phase sequence relay XJ ₂Be serially connected on the path of winding of above-mentioned A.C. contactor CJ.Between every phase circuit of A, B, C three-phase power line and zero line N, be connected to voltage relay 1DY, a 2DY, 3DY respectively, each normally opened contact 1DY of three voltage relays ₁, 2DY ₁And 3DY ₁After parallel with one another, be serially connected in the path of winding of intermediate relay ZJ.The path of winding of intermediate relay ZJ is connected between A, the C two-phase supply line.On the three contact parallel branches of the voltage relay that in the path of winding of intermediate relay ZJ, is connected in series, also be parallel with a normally opened contact ZJ who is being connected in series intermediate relay ZJ ₁Branch road with shutdown switch TA.In the path of winding of A.C. contactor CJ, also be serially connected with the normally-closed contact ZJ of K switch G and intermediate relay ZJ ₂

The protection course of work of the present utility model is: if phase sequence misconnection, phase line and zero line misconnection, when perhaps having phase failure situation to take place, phase failure phase sequence relay XJ action, the normally opened contact XJ of phase failure phase sequence relay ₂Disconnect the path of winding of A.C. contactor CJ, the main contacts that makes A.C. contactor is normally opened contact CJ ₁, CJ ₂And CJ ₃Disconnect, cut off load power.After pending fault disposes, automatic recovery of power supply.

If when having the zero line situation of blowing to take place, the three-phase load imbalance is connected the minimum voltage relay DY who goes up mutually of load and moves its normally opened contact (1DY because of surpassing definite value ₁, 2DY ₁, 3DY ₁In one) closure, it is electric that the path of winding of intermediate relay ZJ is got, the normally-closed contact ZJ of intermediate relay ZJ ₂Disconnect the coil losing electricity of A.C. contactor CJ, the main contacts CJ of A.C. contactor ₁, CJ ₂And CJ ₃Disconnect, cut off load power.Meanwhile, the normally opened contact ZJ of intermediate relay ZJ ₁Closure makes intermediate relay ZJ be in the self-sustaining state.After pending fault disposes, press stop button TA, the coil losing electricity of intermediate relay ZJ, its normally-closed contact ZJ ₂Closure, it is electric that the coil that exchanges contact device CJ is got, the main contacts CJ of A.C. contactor ₁, CJ ₂And CJ ₃Closure, the power supply that recovers electric equipment.

The utility model also is connected to indicator light HD between A, B two-phase supply line ₁With phase failure phase sequence relay normally-closed contact XJ ₁The serial connection branch road.If phase failure phase sequence relay XJ action, its normally-closed contact XJ ₁Closure, indicator light HD ₁Promptly light, this moment, promptly phase sequence misconnection, phase line and zero line misconnection appearred in expression, perhaps had phase failure situation to take place, and reminded the fault detect and the processing of being correlated with.

The utility model also is connected to indicator light HD between A, C two-phase supply line ₂With auxiliary relay normally opened contact ZJ ₃The serial connection branch road.As long as intermediate relay ZJ gets electronic work, its normally opened contact ZJ ₃Closure, indicator light HD ₂Promptly light, the situation that this moment, i.e. expression had zero line to blow takes place, and reminds the fault detect and the processing of being correlated with.

Claims

1. electric protective device that is used for the three-phase four-wire low-voltage electric power system is connected in series the normally opened contact (CJ of A.C. contactor CJ respectively in A, B, C three-phase power line ₁, CJ ₂, CJ ₃), the path of winding of A.C. contactor CJ is connected between the two-phase supply line, it is characterized in that three inputs of phase failure phase sequence relay XJ join with A, B, C three-phase power line respectively, the normally opened contact XJ of phase failure phase sequence relay XJ ₂Be serially connected on the path of winding of A.C. contactor CJ; Between every phase circuit of three-phase power line and zero line N, be connected to a voltage relay (1DY, 2DY, 3DY) respectively, each normally opened contact (1DY of three voltage relays ₁, 2DY ₁, 3DY ₁) be serially connected in the path of winding of intermediate relay ZJ after parallel with one another, the path of winding of intermediate relay ZJ is connected between the two-phase supply line, the normally opened contact ZJ of a serial connection intermediate relay ZJ also in parallel on three contact parallel branches of voltage relay ₁Branch road with shutdown switch TA; In the path of winding of A.C. contactor CJ, also be serially connected with the normally-closed contact ZJ of K switch G and intermediate relay ZJ ₂

2. electric protective device according to claim 1 is characterized in that being connected to indicator light HD between A, B two-phase supply line ₁With phase failure phase sequence relay normally-closed contact XJ ₁The serial connection branch road.

3. electric protective device according to claim 1 is characterized in that being connected to indicator light HD between A, C two-phase supply line ₂With auxiliary relay normally opened contact ZJ ₃The serial connection branch road.