CN218678432U

CN218678432U - Contactor open-phase motor protection device

Info

Publication number: CN218678432U
Application number: CN202222931203.5U
Authority: CN
Inventors: 何瑞峰; 辛学铭; 岳俊成; 张智; 张宇龙
Original assignee: Inner Mongolia Yitai Jingyue Suancigou Mining Co ltd; Inner Mongolia Zhongyu Taide Coal Co ltd; Ordos Zhongyu Taide Coal Co ltd
Current assignee: Inner Mongolia Yitai Jingyue Suancigou Mining Co ltd; Inner Mongolia Zhongyu Taide Coal Co ltd; Ordos Zhongyu Taide Coal Co ltd
Priority date: 2022-11-03
Filing date: 2022-11-03
Publication date: 2023-03-21
Anticipated expiration: 2032-11-03

Abstract

The utility model discloses a contactor lacks looks motor protection device, it includes A looks intermediate relay, B looks intermediate relay and C looks intermediate relay, A looks intermediate relay's coil, B looks intermediate relay's coil, C looks intermediate relay's coil's one end is connected with A looks, B looks, C of contactor main contact output respectively, A looks intermediate relay's coil, B looks intermediate relay's coil, C looks intermediate relay's coil's the other end all is connected to on the zero line. The advantages are that: the phase-failure motor protection device of the contactor is formed by connecting the circuit breaker, the intermediate relay, the contactor, the time relay, the thermal relay, the stop button, the start button and the indicating lamp together, if the phase-failure phenomenon occurs in the contactor, a control loop is disconnected, the motor is protected from being burnt, and meanwhile, the phase-failure of the contactor is prompted through the alarm indicating lamp.

Description

Contactor open-phase motor protection device

The technical field is as follows:

the utility model belongs to the technical field of the contactor technique and specifically relates to a contactor lacks looks motor protection device.

Background art:

a contactor is an important electrical component in the operation of power equipment, and is often used in a power supply circuit of a motor, and a main contact of the contactor is connected with a main circuit breaker, a thermal relay and a fuse to form a motor control circuit. When the contactor contact damages, can cause the contactor to lack the looks, the lack looks of contactor can make the motor burn out in service. Therefore, how to find the lack of the contactor in time and control the motor to stop running becomes a problem to be solved urgently.

The utility model has the following contents:

an object of the utility model is to provide a contactor that in time controls motor shutdown when contactor lacks the looks lacks looks motor protection device.

The utility model discloses by following technical scheme implement: a contactor phase-lack motor protection device comprises an A phase intermediate relay, a B phase intermediate relay and a C phase intermediate relay,

one end of a coil of the phase A intermediate relay, one end of a coil of the phase B intermediate relay and one end of a coil of the phase C intermediate relay are respectively connected with the phase A, the phase B and the phase C of the output end of the main contact of the contactor, and the other ends of the coil of the phase A intermediate relay, the coil of the phase B intermediate relay and the coil of the phase C intermediate relay are connected to a zero line;

the stop button, the start button, the normally closed contact of the time relay, the coil of the contactor and the normally closed contact of the thermal relay are connected in series and then connected with a power supply;

the starting button is connected with an auxiliary normally open contact of the contactor in parallel, and a normally open contact of the phase A intermediate relay, a normally open contact of the phase B intermediate relay and a normally open contact of the phase C intermediate relay are connected in series and then connected with a normally closed contact of the time relay in parallel; and a normally open contact of the C-phase intermediate relay is connected with a coil of the time relay in series and then is connected with a power supply.

Furthermore, a normally closed contact of the phase A intermediate relay is connected with the phase A alarm indicator lamp in series and then is connected with a power supply; the normally closed contact of the phase B intermediate relay is connected with the phase B alarm indicator lamp in series and then is connected with a power supply; and a normally closed contact of the C-phase intermediate relay is connected with the C-phase alarm indicating lamp in series and then is connected with a power supply.

The utility model has the advantages that: the phase-lacking motor protection device of the contactor is formed by connecting the circuit breaker, the intermediate relay, the contactor, the time relay, the thermal relay, the stop button, the start button and the indicating lamp together, if the phase-lacking phenomenon occurs to the contactor, the control loop is disconnected, the motor is protected from being burnt, and meanwhile, the phase-lacking motor protection device prompts that phase of the contactor to be in phase-lacking through the alarm indicating lamp.

Description of the drawings:

fig. 1 is a schematic view of the overall structure of the present invention.

The specific implementation mode is as follows:

as shown in figure 1, the contactor phase-lack motor protection device comprises an A-phase intermediate relay (KA 1), a B-phase intermediate relay (KA 2) and a C-phase intermediate relay (KA 3),

a control loop breaker QF2 is arranged on a power control loop, one end of a coil of an A-phase intermediate relay (KA 1), a coil of a B-phase intermediate relay (KA 2) and one end of a coil of a C-phase intermediate relay (KA 3) are respectively connected with the A phase, the B phase and the C phase of the main contact output end of the contactor (KM), and the other ends of the coil of the A-phase intermediate relay (KA 1), the coil of the B-phase intermediate relay (KA 2) and the coil of the C-phase intermediate relay (KA 3) are connected to a zero line;

the stop button (SB 1), the start button (SB 2), the normally closed contact of the time relay (KT), the coil of the contactor (KM) and the normally closed contact of the thermal relay (FR) are connected in series and then connected with a power supply;

the starting button (SB 2) is connected with an auxiliary normally open contact of the contactor (KM) in parallel, and a normally open contact of the phase A intermediate relay (KA 1), a normally open contact of the phase B intermediate relay (KA 2) and a normally open contact of the phase C intermediate relay (KA 3) are connected in series and then connected with a normally closed contact of the time relay (KT) in parallel; the normally open contact of the C-phase intermediate relay (KA 3) is connected with the coil of the time relay (KT) in series and then connected with a power supply.

A normally closed contact of the A-phase intermediate relay (KA 1) is connected with the A-phase alarm indicator lamp (HL 1) in series and then is connected with a power supply; a normally closed contact of the phase B intermediate relay (KA 2) is connected with the phase B alarm indicator lamp (HL 2) in series and then is connected with a power supply; and a normally closed contact of the C-phase intermediate relay (KA 3) is connected with the C-phase alarm indicator lamp (HL 3) in series and then is connected with a power supply.

The working principle is as follows: when the main circuit breaker QF1 and the control circuit breaker QF2 are switched on, the starting button SB2 is pressed, the coil of the contactor KM is electrified, the coil of the starting time relay KT is electrified to form a loop, the normally-open point KM-1 of the contactor KM is closed to form self-locking, the main contact of the contactor KM is closed, the main loop is switched on, and the motor runs; at this time, the coils of the phase a intermediate relay KA1, the phase B intermediate relay KA2 and the phase C intermediate relay KA3 are all powered, the normally open contacts of the phase a intermediate relay KA1, the phase B intermediate relay KA2 and the phase C intermediate relay KA3 are all closed, and the control circuit forms a loop. Normally closed contacts of the phase A intermediate relay KA1, the phase B intermediate relay KA2 and the phase C intermediate relay KA3 are all disconnected, and the phase A alarm indicator lamp HL1, the phase B alarm indicator lamp HL2 and the phase C alarm indicator lamp HL3 are all turned off.

When the time relay KT reaches the set time, the normally closed point of the time relay KT is switched off, and the motor can still normally run.

When A, B, C of the contactor KM is in any phase loss state, the corresponding normally open contact is disconnected, the coil of the contactor KM loses power, the main contact of the contactor KM is disconnected, and the motor stops running; and the corresponding normally closed contact is closed, and the corresponding alarm indicator lamp is turned on to remind the electrician of the phase loss.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. A contactor phase-lack motor protection device is characterized by comprising an A-phase intermediate relay (KA 1), a B-phase intermediate relay (KA 2) and a C-phase intermediate relay (KA 3), wherein one end of a coil of the A-phase intermediate relay (KA 1), a coil of the B-phase intermediate relay (KA 2) and one end of a coil of the C-phase intermediate relay (KA 3) are respectively connected with the A phase, the B phase and the C phase of a main contact output end of a contactor (KM), and the other ends of the coil of the A-phase intermediate relay (KA 1), the coil of the B-phase intermediate relay (KA 2) and the coil of the C-phase intermediate relay (KA 3) are connected to a zero line; the stop button (SB 1), the start button (SB 2), the normally closed contact of the time relay (KT), the coil of the contactor (KM) and the normally closed contact of the thermal relay (FR) are connected in series and then connected with a power supply; the starting button (SB 2) is connected with an auxiliary normally open contact of the contactor (KM) in parallel, and a normally open contact of the phase A intermediate relay (KA 1), a normally open contact of the phase B intermediate relay (KA 2) and a normally open contact of the phase C intermediate relay (KA 3) are connected in series and then connected with a normally closed contact of the time relay (KT) in parallel; the normally open contact of the C-phase intermediate relay (KA 3) is connected with the coil of the time relay (KT) in series and then connected with a power supply.

2. The contactor phase-lack motor protection device according to claim 1, characterized in that a normally closed contact of a phase A intermediate relay (KA 1) and a phase A alarm indicator lamp (HL 1) are connected in series and then connected with a power supply; a normally closed contact of the phase B intermediate relay (KA 2) is connected with the phase B alarm indicator lamp (HL 2) in series and then is connected with a power supply; and a normally closed contact of the C-phase intermediate relay (KA 3) is connected with the C-phase alarm indicator lamp (HL 3) in series and then is connected with a power supply.