CN210956555U

CN210956555U - Novel electric loop thermal relay reset circuit

Info

Publication number: CN210956555U
Application number: CN201920421629.1U
Authority: CN
Inventors: 孙晓明; 孙传辉; 刘相; 鲁晓华; 吴保章; 王晓明
Original assignee: KAIFENG LONGYU CHEMICAL CO Ltd
Current assignee: KAIFENG LONGYU CHEMICAL CO Ltd
Priority date: 2019-03-30
Filing date: 2019-03-30
Publication date: 2020-07-07
Anticipated expiration: 2029-03-30

Abstract

A novel electrical loop thermal relay reset circuit comprises a start-stop loop, a reset loop and a reset signal loop, wherein the start-stop loop, the reset loop and the reset signal loop are connected between a power supply one phase and a power supply zero line; the start-stop loop comprises a start button, an alternating current contactor coil, a thermal relay normally closed contact and an intermediate relay normally closed contact which are connected in sequence; both sides of the starting button are connected with the normally open contacts of the alternating current contactor; the reset circuit comprises a starting button, a thermal relay normally open contact and an intermediate relay coil which are connected in sequence, and the intermediate relay normally open contact is connected to two sides of the thermal relay normally open contact. The utility model discloses can reduce the action of thermal relay and reset drawer type switch cabinet and pull out the number of times, avoid causing drawer type switch one, secondary sound plug the wearing and tearing, and contact failure, generate heat the wait phenomenon cause generating line discharge, alternate short circuit, one, secondary sound plug to damage.

Description

Novel electric loop thermal relay reset circuit

Technical Field

The utility model discloses an electric switch board, concretely relates to novel electric return circuit thermal relay resets device.

Background

Because the conventional MNS power distribution cabinet drawer loop internal thermal relay adopts manual reset, the thermal relay resets after each action, the drawer type switch cabinet is pulled out of the cabinet to reset, and the phenomena of abrasion, poor contact, heating and the like of the first and second movable and static plugs of the drawer type switch caused by multiple pushing and pulling are caused. Finally, the bus discharge and the interphase short circuit are caused to damage the primary and secondary moving and static plugs, the power distribution section is subjected to switch trip, the production equipment is tripped, and the serious consequence of safety production is harmed.

SUMMERY OF THE UTILITY MODEL

The utility model provides an electric thermal relay resetting means to solve the problem that prior art exists.

The utility model adopts the following technical scheme:

a novel electrical loop thermal relay reset circuit comprises a start-stop loop, a reset loop and a reset signal loop, wherein the start-stop loop, the reset loop and the reset signal loop are connected between a power supply one phase and a power supply zero line;

the start-stop loop comprises a start button, an alternating current contactor coil, a thermal relay normally closed contact and an intermediate relay normally closed contact which are connected in sequence; both sides of the starting button are connected with the normally open contacts of the alternating current contactor;

the reset circuit comprises a starting button, a thermal relay normally open contact and an intermediate relay coil which are connected in sequence, and the two sides of the thermal relay normally open contact are also connected with the intermediate relay normally open contact;

the reset signal loop comprises an intermediate relay normally open contact and a fault signal lamp which are connected in sequence.

The start-stop loop further comprises a DCS normally closed contact which is connected between the start button and the alternating current contactor coil.

The power supply circuit also comprises an operation signal loop and a stop signal loop which are connected between the power supply phase one and the power supply zero line;

the operation signal loop comprises a parallel loop of an alternating current contactor normally open contact, an operation indicator lamp I and an operation indicator lamp II which are connected in sequence;

the stop signal loop comprises a normally closed contact of the alternating current contactor, a stop indicator lamp I and a parallel loop of the stop indicator lamp II which are connected in sequence.

The system also comprises a main loop, wherein the main loop comprises an air circuit breaker, an alternating current contactor normally open contact, a thermal relay coil and a motor which are connected with a three-phase power supply;

after a power supply I of the reset circuit is connected with a wire inlet section of the air circuit breaker, the power supply I is connected with a start-stop circuit, a reset circuit and a reset signal circuit through a switch and a fuse, and a wire outlet section of the air circuit breaker is directly connected with the fuse.

The thermal relay is in an automatic reset state.

The utility model has the advantages that:

(1) arranging an indicator light to enable people to enter the power distribution room and clearly see the equipment with the fault;

(3) the drawer type switch cabinet pulling-out frequency of action reset of the thermal relay can be reduced, and the serious consequences that bus discharge, interphase short circuit, damage of the first and second movable and fixed plugs, switch tripping of a power distribution section, tripping of production equipment and safety production are damaged due to the abrasion of the first and second movable and fixed plugs of the drawer type switch, poor contact, heating and the like are avoided;

(4) the wiring of the electric circuit is simple and easy to understand, the adopted equipment is easy to purchase and has low price;

(5) the safety operation stability is high;

(6) the system can reduce a large amount of maintenance cost (abrasion, poor contact and heating replacement cost of the primary and secondary movable and static plugs of the drawer type switch) and working hours, and realize national energy-saving and emission-reducing guidelines.

Drawings

FIG. 1 is a diagram of a reset circuit in the prior art

Fig. 2 is a structural diagram of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

The utility model provides a novel electrical loop thermal relay reset circuit, this reset circuit improve the thermal relay reset circuit in the current MNS switch board drawer return circuit, reduce all will pull out the defect that resets outside the cabinet with drawer type switch cabinet after the thermal relay action at every turn.

The utility model discloses a major loop does not improve, only improves reset circuit.

As shown in the diagram of fig. 1, the left side is the original main loop, and the present invention also adopts the main loop. The main circuit comprises an air circuit breaker QF connected with a three-phase incoming line power supply, an alternating current contactor normally open contact KM-4, a thermal relay coil FH and a motor M; an incoming line power supply enters an air circuit breaker QF incoming line section, an air circuit breaker QF outgoing line section is connected with an incoming line of an alternating current contactor normally-open contact KM-4, an outgoing line of the alternating current contactor normally-open contact KM-4 is connected with an incoming line of a thermal relay coil FH, and the outgoing line of the thermal relay coil FH is connected with a load motor through a current transformer to complete a main loop.

The original control loop comprises: the first power supply is connected with a start button SB1 (No. 1 line) through a fuse FU, then connected with a stop button SB2 (No. 3 line), then connected with a DCS protection normally closed contact (No. 4 line), then connected with an alternating current contactor coil KM (No. 5 phase), then connected with a thermal relay normally closed contact FH-1 (No. 6 line), and finally connected with a power supply zero line (No. 0 line).

And the utility model discloses control circuit is like figure 2, including opening the stop loop, return circuit, reset signal return circuit, operation signal return circuit, stop signal return circuit that open of connecting between power one phase and power zero line, the power one phase is connected through switch S and fuse FU and is opened the stop loop, return circuit, reset signal return circuit.

As shown in fig. 1, after a power supply one end of the reset circuit is connected with a wire inlet section of the air circuit breaker QF, the power supply one end of the reset circuit is connected with the start-stop circuit, the reset circuit and the reset signal circuit through the switch S and the fuse FU, and a wire outlet section of the air circuit breaker QF is directly connected with the fuse FU.

The start-stop loop comprises a start button SB1, a start button SB2, a DCS normally closed contact DCS-1, an alternating current contactor coil KM, a thermal relay normally closed contact FH-1 and an intermediate relay normally closed contact KA-1 which are connected in sequence; and both sides of the starting button SB1 are connected with a normally open contact KM-1 of an alternating current contactor.

The DCS normally closed contact DCS-1 is a contact existing in an existing circuit, the DCS is a distributed control system, a normally closed node appears in an electric loop, and the node can be controlled to be opened and closed in a background.

The reset loop comprises a starting button SB3, a thermal relay normally open contact FH-2 and an intermediate relay coil KA which are connected in sequence, and the two sides of the thermal relay normally open contact FH-2 are also connected with the intermediate relay normally open contact KA-2;

the reset signal loop comprises an intermediate relay normally open contact KA-3 and a fault signal lamp WA which are sequentially connected.

The operation signal loop comprises a parallel loop of an alternating current contactor normally open contact KM-2, an operation indicator lamp I RD1 and an operation indicator lamp II RD2 which are sequentially connected, RD1 is an operation indicator lamp on a drawer loop of the power distribution cabinet, and RD2 is an operation indicator lamp on a field operation column.

The stop signal loop comprises a parallel loop of an alternating current contactor normally closed contact KM-3, a stop indicator lamp I GN1 and a stop indicator lamp II GN2 which are sequentially connected, RD1 is the stop indicator lamp on the drawer loop of the power distribution cabinet, and RD2 is the stop indicator lamp on the field operation column.

That is, as shown in fig. 1, the start-stop circuit: the first control power supply is connected with a start button SB1 (No. 1 line) through a fuse FU, then connected with a stop button SB2 (No. 3 line), then connected with a DCS normally closed contact DCS-1 (No. 4 line), then connected with an alternating current contactor coil KM (No. 5 line), then connected with a thermal relay normally closed contact FH-1 (No. 6 line), then connected with an intermediate relay normally closed contact KA-1 (No. 7 line), and finally connected with a control power supply zero line (No. 0 line), so that the start-stop loop is completed.

A reset loop: the first control power supply is connected with a reset button SB3 (No. 1 line) through a fuse FU, then connected with a normally open contact FH-2 of a thermal relay (No. 10 line), then connected with a coil KA of an intermediate relay (No. 11 line), and finally connected with a zero line of the control power supply (No. 0 line) to complete a reset loop.

The utility model discloses during the application:

1. the thermal relay FH device is first switched from the manual reset (Handle) to the automatic reset (Auto) position.

2. When the load is overlarge for a certain time, the thermal relay FH acts, the normally closed contacts FH-1 (95 and 96) of the thermal relay are disconnected to enable the load motor to be mediated and stopped, the normally open contacts FH-2 (97 and 98) of the thermal relay are closed, the fault signal lamp WH is on, meanwhile, the intermediate relay KA attracts the intermediate relays KA (17 and 19) to be closed to send out an alarm signal, and at the moment, the normally closed contacts (23 and 24) of the intermediate relay KA are disconnected to cut off the control loop again.

3. After a few seconds, the thermal relay FH resets automatically, the normally closed contacts FH-1 (95, 96) of the thermal relay close, and the normally open contacts FH-2 (97, 98) of the thermal relay open.

4. And (4) informing the electrical personnel of load regulation, inspection or resetting.

5. The electrical personnel can measure the load motor M (the motor is normally insulated to the ground and the direct current resistance is normal) without pulling the drawer type switch cabinet.

6. After the measured value is normal, an electric worker presses a reset button SB3, the intermediate relay KA loses power, the fault signal WA lamp goes out of fault and is eliminated, meanwhile, the intermediate relay KA normally closes a contact, and the reset operation is completed.

7. The electrical personnel inform the process operating load that it is normal and that it has been reset and can restart the plant for operation.

In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the present invention should be covered by the protection scope of the present invention.

Claims

1. The utility model provides a novel electric return circuit thermorelay reset circuit which characterized in that: the reset circuit comprises a start-stop loop, a reset loop and a reset signal loop which are connected between a power supply one-phase and a power supply zero line, wherein the power supply one-phase is connected with the start-stop loop, the reset loop and the reset signal loop through a switch (S) and a Fuse (FU);

the starting and stopping loop comprises a starting button I (SB 1), a starting button II (SB 2), an alternating current contactor coil (KM), a normally closed contact of a thermal relay (FH-1) and a normally closed contact of an intermediate relay (KA-1) which are sequentially connected; two sides of the starting button I (SB 1) are connected with a normally open contact I (KM-1) of the alternating current contactor;

the reset loop comprises a starting button III (SB 3), a thermal relay normally open contact (FH-2) and an intermediate relay coil (KA) which are sequentially connected, and the two sides of the thermal relay normally open contact (FH-2) are also connected with an intermediate relay normally open contact I (KA-2);

the reset signal loop comprises an intermediate relay normally open contact III (KA-3) and a fault signal lamp (WA) which are sequentially connected.

2. The novel electrical loop thermal relay reset circuit of claim 1, wherein:

the start-stop loop further comprises a DCS normally closed contact (DCS-1), and the DCS normally closed contact (DCS-1) is connected between the start button II (SB 2) and the alternating current contactor coil (KM).

3. The novel electrical loop thermal relay reset circuit of claim 1, wherein: the power supply circuit also comprises an operation signal loop and a stop signal loop which are connected between the power supply phase one and the power supply zero line;

the operation signal loop comprises a parallel loop of an alternating current contactor normally open contact II (KM-2), an operation indicator lamp I (RD 1) and an operation indicator lamp II (RD 2) which are connected in sequence;

the stop signal loop comprises a parallel loop of an alternating current contactor normally closed contact (KM-3), a stop indicator lamp I (GN 1) and a stop indicator lamp II (GN 2) which are sequentially connected.

4. The novel electrical loop thermal relay reset circuit of claim 1, wherein: the system also comprises a main loop, wherein the main loop comprises an air circuit breaker (QF) connected with a three-phase power supply, an alternating current contactor normally open contact III (KM-4), a thermal relay coil (FH) and a motor (M);

a power supply I of the reset circuit is connected with an incoming line section of the air circuit breaker (QF), then the power supply I is connected with a start-stop loop, a reset loop and a reset signal loop through a switch (S) and a fuse protector (FU), and an outgoing line section of the air circuit breaker (QF) is directly connected with the fuse protector (FU).

5. The novel electrical loop thermal relay reset circuit of claim 1, wherein: the thermal relay is in an automatic reset state.