CN2233634Y

CN2233634Y - Magnetic starter

Info

Publication number: CN2233634Y
Application number: CN 95233028
Authority: CN
Inventors: 杨彦民
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-01-06
Filing date: 1995-01-06
Publication date: 1996-08-21
Anticipated expiration: 2005-01-06

Abstract

The utility model relates to a magnetic starter which is realized by the improvement on the basis of a magnetic starter in the prior art. The magnetic starter is characterized in that the circuit part of the magnetic starter is additionally provided with an open-phase monitoring return circuit. The phase-open monitoring return circuit is formed by that a normally open contact pair ZJ[1] of an intermediate relay ZJ and an intermediate relay connected with the intermediate relay ZJ in series is connected with a normally open contact CQ[1] pair of the magnetic starter; the phase-open monitoring return circuit is connected with the two phases B and C of a power supply; a signal lamp XD can be connected in series with the return circuit of the ZJ[1] and the CQ[1] which are connected in series. The utility model has the advantages of simple structure and convenient connection, and effectively enhances the functions of open-phase protection and operational signal monitoring for a power supply; therefore, the practicality and the protective capability for the control equipment of the magnetic starter are improved further.

Description

A kind of magnetic starter

The utility model belongs to the electrical apparatus technology scope, relates to a kind of starter, particularly a kind of magnetic starter.

The magnetic starter of prior art; though have lot of advantages; but a control protection loop is only arranged all generally; be connected on power supply A, B or B, the C two-phase; can only realize being connect the open-phase protection of two-phase; and during another phase phase shortage, then can not realize its open-phase protection, thereby still often cause the damage of control appliance.

Task of the present utility model provides a kind of simple in structure, easy-to-connect, can realize three-phase, so that the magnetic force protector of four phase open-phase protections and monitor function, to overcome the above-mentioned deficiency of existing in prior technology.

The utility model is to improve to realize that it comprises housing on the basis of prior art magnetic starter, and its circuit part has thermal relay RJ as shown in Figure 1, and power supply A, B, C three-phase are connected in series Third Mate's normally opened contact CQ of magnetic starter CQ respectively ₃, CQ ₄And CQ ₅The control loop of magnetic starter is met one pair of normally opened contact CQ of button HA and CQ by startup ₂Parallel connection, and one pair of normally opened contact RJ of serial connection stop button TA, magnetic starter CQ and thermal relay ₁Constitute, be connected on power supply A, the B two-phase, its main points are that this starter also is provided with phase shortage supervision loop, and this loop is by one pair of normally opened contact ZJ of intermediate relay ZJ and the auxiliary relay of connecting ₁, magnetic starter one pair of normally opened contact CQ ₁Parallel connection is connected on power supply B, the C two-phase (as power supply is three-phase and four-line, also can be connected to C phase and N), simultaneously, and another of auxiliary relay pair normally opened contact ZJ ₂Be serially connected in the control loop of magnetic starter.

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

For strengthening operation monitor function of the present utility model, said phase shortage supervision is provided with a signal lamp XD in the loop, with one pair of normally opened contact ZJ of ZJ ₁, CQ one pair of normally opened contact CQ ₁Series connection.

When the arbitrary phase phase shortage of power supply A, B, the control loop outage of magnetic starter makes CQ refuse to close a floodgate or tripping operation; When power supply C phase phase shortage, phase shortage supervision loop outage.Intermediate relay ZJ loses power supply, and ZJ2 opens, and causes the control loop outage, and CQ refuses to close a floodgate or tripping operation, thereby realizes the open-phase protection of the arbitrary phase of three-phase; When CQ or ZJ were in off position, signal lamp XD did not work, and when they were in running order, XD was then bright, thereby realized whether supervision CQ and ZJ are in normal operating condition.

The utility model is simple and reasonable, has strengthened power supply open-phase protection and run signal monitor function effectively, thereby has further improved the practicality of magnetic starter and to the protective capability of control appliance.

Claims

1, a kind of magnetic starter comprises housing, and circuit part has thermal relay RJ, and power supply A, B, C three-phase are connected in series Third Mate's normally opened contact CQ of magnetic starter CQ respectively ₃, CQ ₄And CQ ₅The control loop of magnetic starter is connected on power supply A, the B two-phase, it is characterized in that it is provided with phase shortage supervision loop, and this loop is by one pair of normally opened contact ZJ of intermediate relay ZJ and the auxiliary relay of connecting ₁, one pair of normally opened contact CQ of magnetic starter ₁Parallel connection is connected on power supply B, the C two-phase, simultaneously, and another of auxiliary relay pair normally opened contact ZJ ₂Be serially connected in the control loop of magnetic starter.

2, magnetic starter according to claim 1 is characterized in that said phase shortage supervision loop, wherein is provided with a signal lamp XD, with said normally opened contact ZJ ₁, normally opened contact CQ ₁Series connection.