CN202696519U

CN202696519U - Self-coupling voltage-reducing starting cabinet

Info

Publication number: CN202696519U
Application number: CN 201220365644
Authority: CN
Inventors: 叶雷胜
Original assignee: ZHEJIANG YONGHUA ELECTRICAL CO Ltd
Current assignee: ZHEJIANG YONGHUA ELECTRICAL CO Ltd
Priority date: 2012-07-25
Filing date: 2012-07-25
Publication date: 2013-01-23
Anticipated expiration: 2022-07-25

Abstract

The utility model relates to a self-coupling voltage-reducing starting cabinet, which comprises a motor self-coupling voltage-reducing starting circuit and a motor running control circuit, wherein a three-phase power supply source is connected to a three-phase alternating-current asynchronous motor through a motor comprehensive protector (ZD) and the main contact of a third contactor (3KM); the main contact of a second contactor (2KM), a self-coupling transformer (TAT) and the main contact of a first contactor (1KM) are connected in series in sequence; the lead-in end of the main contact of the second contactor (2KM) and the middle tap of the self-coupling transformer (TAT) are connected to the lead-in end and lead-out end of the main contact of the third contactor (3KM) respectively; and the three-phase lead-out end of the main contact of the first contactor (1KM) is connected in parallel. The motor comprehensive protector is connected to the motor self-coupling voltage-reducing starting circuit, is used for replacing a thermal relay, and is assembled by using a plurality of devices to form other failure protection circuits. The self-coupling voltage-reducing starting cabinet has the characteristics of easiness in wiring and maintaining, small quantity of contacts, low failure rate and large quantity of protection types.

Description

A kind of self-coupling decompression starting cabinet

Technical field

The utility model relates to a kind of self-coupling decompression starting cabinet.

Background technology

Self-coupling decompression starting refers to when electric motor starting, utilizes autotransformer to reduce to be added in the starting resistor on the motor stator winding.After motor is finished starting, motor and autotransformer are broken away from, thereby under total head proper motion.This reduced-voltage starting can select the different taps of autotransformer to realize reduced-voltage starting by the starting current that allows and required detent torque.Existing self-coupling decompression starting cabinet generally adopts thermal relay or overcurrent protector to come motor is protected, and when facing large-scale motor, the screw tie point of thermal relay just is easy to fever phenomenon occur and break down.And when slight overcurrent, earth fault occured motor, thermal relay or overcurrent relay can not be protected again motor effectively, caused serious damage, and maintenance cost is high.

Summary of the invention

The purpose of this utility model is to overcome the defective of prior art, and a kind of self-coupling decompression starting cabinet that adopts comprehensive protector of motor to realize the kinds of protect such as motor overload, overcurrent, earth fault is provided.

For achieving the above object; the utility model adopts a kind of like this self-coupling decompression starting cabinet; comprise motor self-coupling decompression starting circuit and motor running control circuit; the three phase supply power supply is successively through comprehensive protector of motor ZD; the main contact of the 3rd contactor 3KM is connected to ac three-phase asynchronous motor; the main contact of the second contactor 2KM; the main contact of autotransformer TAT and the first contactor 1KM is connected successively; the centre tap of the end of incoming cables of the main contact of the second contactor 2KM and described autotransformer TAT is connected to end of incoming cables and the leading-out terminal of the main contact of described the 3rd contactor 3KM, and the three-phase leading-out terminal of the main contact of described the first contactor 1KM also connects.

Especially; in described three phase supply power supply, draw the two-phase electricity; described motor running control circuit comprises that minute loop accesses the indicating circuit that stops of described two-phase electricity; starting and indicating circuit; delay circuit and operation and indicating circuit; describedly stop the normally closed auxiliary contact 3KM1 that indicating circuit comprises the 3rd contactor 3KM that is connected in series successively; the normally closed auxiliary contact 2KM1 of the second contactor 2KM and stop indicator light HR; described starting and indicating circuit; the trunk roads of described delay circuit and described operation and indicating circuit are serially connected with the break contact of stop button SB1 and the normally closed auxiliary contact ZD1 of described comprehensive protector of motor ZD; described starting and indicating circuit comprise the coil of described the first contactor 1KM and the coil of described the second contactor 2KM; the on-delay breaking-off contact KT1 of time relay KT; the normally closed auxiliary contact 3KM2 of described the 3rd contactor 3KM; the make contact of starting button SB2; the normally closed auxiliary contact K θ of the coil of described the first contactor 1KM and temperature detect switch (TDS) is connected in series between rear access e node and the c node successively; often opening auxiliary contact 1KM1 and starting of described the first contactor 1KM is connected between a node and described c node after indicator light HY connects; described the first contactor often open the two ends that auxiliary contact 1KM1 also is connected to the make contact of described starting button SB2; be connected between described e node and the b node after the coil series connection of often opening auxiliary contact 1KM2 and described the second contactor 2KM of described the first contactor 1KM; described delay circuit comprises the coil of often opening auxiliary contact 2KM2 and described time relay KT of described the second contactor 2KM that is connected in series; described delay circuit is connected between described e node and the described c node; described operation and indicating circuit comprise the coil of the 3rd contactor 3KM and the coil of comprehensive protector of motor ZD; the closed contact KT2 of the on-delay of described time relay KT is respectively through the coil of described the 3rd contactor 3KM; the coil of described comprehensive protector of motor ZD and described run indicator HG are connected to node c, and described the 3rd contactor 3KM often opens the two ends that auxiliary contact 3KM3 is connected to the closed contact KT2 of on-delay of described time relay KT.

Compared with the prior art; the beneficial effects of the utility model are embodied in: comprehensive protector of motor is connected in the motor self-coupling decompression starting circuit; replace thermal relay and assemble to finish the circuit of other error protections by multiple device, the utlity model has wiring simple, be easy to safeguard, contact is few and failure rate is low and the many characteristics of protection type.

Description of drawings

Fig. 1 is an assembly structure schematic diagram of a kind of self-coupling decompression starting cabinet of the utility model embodiment;

Fig. 2 is the schematic diagram of motor self-coupling decompression starting circuit in a kind of self-coupling decompression starting cabinet of the utility model embodiment;

Fig. 3 is the schematic diagram of motor running control circuit in a kind of self-coupling decompression starting cabinet of the utility model embodiment.

Embodiment

Shown in Fig. 1～3; a kind of self-coupling decompression starting cabinet; comprise motor self-coupling decompression starting circuit and motor running control circuit; the three phase supply power supply is successively through comprehensive protector of motor ZD; the main contact of the 3rd contactor 3KM is connected to ac three-phase asynchronous motor; the main contact of the second contactor 2KM; the main contact of autotransformer TAT and the first contactor 1KM is connected successively; the centre tap of the end of incoming cables of the main contact of the second contactor 2KM and autotransformer TAT is connected to end of incoming cables and the leading-out terminal of the main contact of the 3rd contactor 3KM, and the three-phase leading-out terminal of the main contact of the first contactor 1KM also connects.

In the three phase supply power supply, draw the two-phase electricity; the motor running control circuit comprises the indicating circuit that stops of minute loop access two-phase electricity; starting and indicating circuit; delay circuit and operation and indicating circuit; stop the normally closed auxiliary contact 3KM1 that indicating circuit comprises the 3rd contactor 3KM that is connected in series successively; the normally closed auxiliary contact 2KM1 of the second contactor 2KM and stop indicator light HR; starting and indicating circuit; the trunk roads of delay circuit and operation and indicating circuit are serially connected with the break contact of stop button SB1 and the normally closed auxiliary contact ZD1 of comprehensive protector of motor ZD; starting and indicating circuit comprise the coil of the first contactor 1KM and the coil of the second contactor 2KM; the on-delay breaking-off contact KT1 of time relay KT; the normally closed auxiliary contact 3KM2 of the 3rd contactor 3KM; the make contact of starting button SB2; the normally closed auxiliary contact K θ of the coil of the first contactor 1KM and temperature detect switch (TDS) is connected in series between rear access e node and the c node successively; often opening auxiliary contact 1KM1 and starting of the first contactor 1KM is connected between a node and c node after indicator light HY connects; the first contactor often open the two ends that auxiliary contact 1KM1 also is connected to the make contact of starting button SB2; be connected between e node and the b node after the coil series connection of often opening auxiliary contact 1KM2 and the second contactor 2KM of the first contactor 1KM; delay circuit comprises the coil of often opening auxiliary contact 2KM2 and time relay KT of the second contactor 2KM that is connected in series; delay circuit is connected between e node and the c node; operation and indicating circuit comprise the coil of the 3rd contactor 3KM and the coil of comprehensive protector of motor ZD; the closed contact KT2 of the on-delay of time relay KT is respectively through the coil of the 3rd contactor 3KM; the coil of comprehensive protector of motor ZD and run indicator HG are connected to node c, and the 3rd contactor 3KM often opens the two ends that auxiliary contact 3KM3 is connected to the closed contact KT2 of on-delay of time relay KT.

Operation principle of the present utility model: when connection three phase supply power supply, the power connection of motor motion control circuit, it is bright to stop indicator light HR, press starting button SB2, motor begins reduced voltage starting, stops indicator light HR and goes out, HY is bright for the starting indicator light, and time relay KT starts working.Timing one is arrived, closed contact KT2 is closed for the on-delay of time relay KT, connect the coil of the 3rd contactor 3KM, at this moment, the main contact of the 3rd contactor 3KM is closed, and simultaneously, the normally closed auxiliary contact 3KM2 of the 3rd contactor 3KM disconnects, the first contactor 1KM main contact and the second contactor 2KM main contact disconnect because of coil losing electricity, and motor begins the total head operation.

Claims

1. self-coupling decompression starting cabinet; comprise motor self-coupling decompression starting circuit and motor running control circuit; it is characterized in that: the three phase supply power supply is successively through comprehensive protector of motor (ZD); the main contact of the 3rd contactor (3KM) is connected to ac three-phase asynchronous motor; the main contact of the second contactor (2KM); the main contact of autotransformer (TAT) and the first contactor (1KM) is connected successively; the centre tap of the end of incoming cables of the main contact of the second contactor (2KM) and described autotransformer (TAT) is connected to end of incoming cables and the leading-out terminal of the main contact of described the 3rd contactor (3KM), and the three-phase leading-out terminal of the main contact of described the first contactor (1KM) also connects.

2. a kind of self-coupling decompression starting cabinet according to claim 1; it is characterized in that: in described three phase supply power supply, draw the two-phase electricity; described motor running control circuit comprises that minute loop accesses the indicating circuit that stops of described two-phase electricity; starting and indicating circuit; delay circuit and operation and indicating circuit; describedly stop the normally closed auxiliary contact (3KM1) that indicating circuit comprises the 3rd contactor (3KM) that is connected in series successively; the normally closed auxiliary contact (2KM1) of the second contactor (2KM) and stop indicator light (HR); described starting and indicating circuit; the trunk roads of described delay circuit and described operation and indicating circuit are serially connected with the break contact of stop button (SB1) and the normally closed auxiliary contact (ZD1) of described comprehensive protector of motor (ZD); described starting and indicating circuit comprise the coil of described the first contactor (1KM) and the coil of described the second contactor (2KM); the on-delay breaking-off contact (KT1) of the time relay (KT); the normally closed auxiliary contact (3KM2) of described the 3rd contactor (3KM); the make contact of starting button (SB2); the coil of described the first contactor (1KM) and the normally closed auxiliary contact of temperature detect switch (TDS) (K θ) are connected in series between rear access e node and the c node successively; often opening auxiliary contact (1KM1) and starting of described the first contactor (1KM) is connected between a node and described c node after indicator light (HY) is connected; described the first contactor often open the two ends that auxiliary contact (1KM1) also is connected to the make contact of described starting button (SB2); be connected between described e node and the b node after the coil series connection of often driving auxiliary contact (1KM2) and described the second contactor (2KM) of described the first contactor (1KM); described delay circuit comprises the coil of often opening auxiliary contact (2KM2) and the described time relay (KT) of described the second contactor (2KM) that is connected in series; described delay circuit is connected between described e node and the described c node; described operation and indicating circuit comprise the coil of the 3rd contactor (3KM) and the coil of comprehensive protector of motor (ZD); the closed contact of the on-delay of the described time relay (KT) (KT2) is respectively through the coil of described the 3rd contactor (3KM); the coil of described comprehensive protector of motor (ZD) and described run indicator (HG) are connected to node c, described the 3rd contactor (3KM) often open the two ends that auxiliary contact (3KM3) is connected to the closed contact of on-delay (KT2) of the described time relay (KT).