CN2301806Y

CN2301806Y - Loss-of-phase protection AC contactor

Info

Publication number: CN2301806Y
Application number: CN 97225461
Authority: CN
Inventors: 段辽元
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-06-17
Filing date: 1997-06-17
Publication date: 1998-12-23
Anticipated expiration: 2007-06-17

Abstract

The utility model provides an open-phase protection AC contactor. The utility model is characterized in that the utility model is additionally provided with an auxiliary contactor and a normally open button on the basis of an ordinary AC contactor; the coil power supply of the auxiliary contactor comes from the two output ends of the ordinary AC contactor, the normally open button is connected in series in the coil power supply loop of the ordinary AC contactor, and the normaly open button is connected in parallel with one pair of contacts of the auxiliary contactor. Whichever one phase generates an open-phase accident in the process of running, the utility model can cut off the circuit to make the motor stop running.

Description

The open-phase protection A.C. contactor

The utility model relates to the A.C. contactor that uses on a kind of three phase electric machine.

Present common A.C. contactor, in use because a certain phase phase shortage, and therefore circuit can not disconnect and cause the motor phase-deficient operation to burn winding, and motor windings burns 85% because phase shortage causes according to statistics.

The purpose of this utility model just provides a kind of A.C. contactor with open-phase protection function.

The purpose of this utility model can realize by following scheme.On common A.C. contactor, install an auxiliary contactor and one additional and often drive button, the power supply of auxiliary contactor coil is taken from the contact of two outputs on the contactor, often open and connect in the electric power loop that button is serially connected with contactor coil, often opening a pair of contact of auxiliary contactor in parallel on the button, the utility model in use, no matter which phase phase shortage can both be cut off main circuit, makes motor out of service.

Below in conjunction with accompanying drawing the utility model is further described.

Fig. 1 is the circuit theory diagrams of common A.C. contactor.

Fig. 2 is circuit theory diagrams of the present utility model.

Common A.C. contactor comprises contactor C, and the coil power of contactor C comes from X ₂, X ₃The input of phase is provided with in contactor C coil power loop and often opens button QA, and stop button TA often opens button QA contactor C in parallel at X ₃The a pair of contact of going up mutually, this common A.C. contactor is at X ₁Phase or X ₂During the output phase shortage of phase, the coil power that all can not cut off contactor C, the motor phase-deficient operation burns winding.The utility model is at the X of contactor C for this reason ₁, X ₂The output of phase installs an auxiliary contactor C ' additional, and one of series connection is often opened button QA ' and at a pair of contact of the two ends of often opening button QA ' auxiliary contactor C ' in parallel in the electric power loop of contactor C coil.Press simultaneously during the utility model starting and often open button QA, QA '.Contactor C gets electric adhesive, and main circuit is connected.Unclamp QA, QA ', because QA, QA ' go up contact adhesive in parallel, circuit is connected in the same old way.If X at this moment ₁Phase or X ₂During the phase phase shortage, auxiliary contactor C ' dead electricity is thrown off the coil power loop that contact cuts off contactor C, cuts main circuit then, if X ₃During the phase phase shortage, the same with common A.C. contactor, the coil power of contactor C is cut off, and cuts main circuit then, reaches the purpose of three-phase open-phase protection.The utility model is simple in structure, the open-phase protection better function.

Claims

1, a kind of open-phase protection A.C. contactor comprises contactor (C), and the power supply of contactor (C) is taken from X ₂, X ₃The input of phase is provided with in the coil power loop of contactor (C) and often drives button (QA), and stop button (TA) is often driven button (QA) contactor in parallel (C) at X ₃The a pair of contact of going up mutually is characterized in that at X ₁, X ₂An auxiliary contactor of the output adjunction of phase (C '), and in the electric power loop of contactor (C) coil, install one additional and often drive button (QA '), this often opens a pair of contact of button (QA ') auxiliary contactor in parallel (C ').