Electrical control loop for interlocking protection between band-type brake motor and main motor

Abstract

The utility model discloses an electrical control loop for interlocking protection between a band-type brake motor and a main motor, and relates to the technical field of power systems, and the circuit comprises a control loop of the band-type brake motor and an auxiliary loop of a high-voltage switch cabinet of the main motor. A control loop of the band-type brake motor comprises a three-phase power supply connecting wire, a fuse, a low-voltage circuit breaker, a circuit breaker tripping relay, a motor protector, a low-voltage fault output relay and a main contactor, and a coil of the low-voltage fault output relay is connected with a fault output contact of the motor protector in series. And the high-voltage cabinet fault output relay, the high-voltage cabinet start-stop relay, a coil of the main contactor and a protection output contact of the motor protector are sequentially connected in series. According to the invention, a DCS system can be replaced to realize simultaneous start and stop of the main motor and the band-type brake motor, dual protection that the two motors are shut down when the band-type brake motor or the main motor fails is realized, the reconstruction work amount is small, the later failure rate is effectively reduced, and the cost is saved.

Description

Technical Field

[0001] The present application relates to the technical field of power systems, and in particular to an electrical control circuit for interlocking protection between a brake motor and a main motor. Background Art

[0002] Currently, the brake motors and main motors in factories are primarily started and stopped synchronously via the DCS system. Alternatively, some equipment can only start and stop, without interlocking to shut down in the event of a fault. This method of synchronized start and stop of the brake motors and main motors, achieved primarily through the DCS system, results in no interlocking signal between the main motor's high-voltage switchgear and the brake motor, resulting in incomplete protection. In the event of a brake motor fault, the main motor cannot be shut down in an interlocked manner, posing a safety hazard. Furthermore, achieving synchronized start and stop via the DCS system is costly. Utility Model Content

[0003] This application aims to solve at least one of the technical problems existing in the prior art. To this end, this application proposes an electrical control circuit for interlocking protection between a brake motor and a main motor. This circuit can replace the DCS system to achieve simultaneous start and stop of the main motor and brake motor. It also provides dual protection by shutting down both motors in the event of a brake motor or main motor failure. This circuit requires minimal modification work, effectively reduces the subsequent failure rate, and saves costs.

[0004] The present application provides an electrical control circuit for interlocking protection between a brake motor and a main motor, comprising: a control circuit of the brake motor and an auxiliary circuit of a high-voltage switch cabinet for the main motor; the control circuit of the brake motor comprises a three-phase power supply wiring, a fuse, a low-voltage circuit breaker, a circuit breaker trip relay, a motor protector, a low-voltage fault output relay and a main contactor, and the auxiliary circuit of the high-voltage switch cabinet for the main motor comprises a high-voltage cabinet start-stop relay, a high-voltage cabinet fault output relay and a high-voltage switch cabinet trip circuit; the fuse is connected in series with the three-phase AC power supply in the three-phase power supply wiring, and one end of the fuse, one end of the power contact of the motor protector, one end of the coil of the low-voltage fault output relay, and one end of the high-voltage cabinet fault output relay are respectively connected to the fuse away from the three-phase AC power supply in the three-phase power supply wiring. One end of the power supply is connected, the coil of the circuit breaker trip relay is connected in series with the fuse, the coil of the low-voltage fault output relay is connected in series with the fault output contact of the motor protector, the high-voltage cabinet fault output relay, the high-voltage cabinet start-stop relay, the coil of the main contactor and the protection output contact of the motor protector are connected in series in sequence, one end of the coil of the circuit breaker trip relay away from the fuse, the other end of the power contact of the motor protector, one end of the fault output contact of the motor protector away from the coil of the low-voltage fault output relay, and one end of the protection output contact of the motor protector away from the coil of the main contactor are respectively connected to the neutral line in the three-phase power supply wiring, and the normally open contact of the low-voltage fault output relay is connected to the high-voltage switch cabinet tripping circuit.

[0005] According to some embodiments of the present application, the status input common contact of the motor protector, the contactor status input contact of the motor protector, the reset status input contact of the motor protector and the circuit breaker fault input contact of the motor protector are respectively connected in parallel, the normally open contact of the main contactor is connected in series with the contactor status input contact of the motor protector, and the normally open contact of the circuit breaker trip relay is connected in series with the circuit breaker fault input contact of the motor protector.

[0006] According to some embodiments of the present application, the electrical control circuit for interlock protection between the brake motor and the main motor further includes a reset button, and the reset button is connected in series with a circuit breaker fault input contact of the motor protector.

[0007] According to some embodiments of the present application, the control circuit of the brake motor also includes a first lead-in contact of the main motor high-voltage switch cabinet and a second lead-in contact of the main motor high-voltage switch cabinet, the two ends of the first lead-in contact of the main motor high-voltage switch cabinet are respectively connected to the fuse and the high-voltage cabinet fault output relay, and the two ends of the second lead-in contact of the main motor high-voltage switch cabinet are respectively connected to the high-voltage cabinet start-stop relay and the coil of the main contactor.

[0008] In the present application, the high-voltage cabinet start-stop relay of the control circuit of the brake drawer cabinet realizes the simultaneous start and stop of the brake motor when the high-voltage motor starts or stops; when the brake motor stops due to a fault, its fault signal is led to the high-voltage switch cabinet disconnect circuit through the normally open contact of the low-voltage fault output relay to disconnect the high-voltage circuit breaker. When the main motor fails, the brake motor control circuit can also be disconnected through the normally closed contact of the high-voltage cabinet fault output relay to achieve shutdown; the fault signal caused by the high-voltage switch cabinet of the main motor is a passive normally open contact after being isolated by the low-voltage fault output relay, which effectively prevents the AC power from being connected to the high-voltage DC circuit; similarly, the fault signal caused by the high-voltage switch cabinet of the main motor to the control circuit of the brake motor is a passive normally closed contact after being isolated by the high-voltage cabinet fault output relay, which prevents the DC power from being connected to the AC circuit. Through this setting, the present application can replace the DCS system to realize the simultaneous start and stop of the main motor and the brake motor, and can also realize the dual protection of both motors shutting down when the brake motor or the main motor fails, and the transformation project is small, effectively reducing the later failure rate and saving costs.

[0009] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Additional aspects and advantages of the present application will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0011] Figure 1 A circuit diagram of an electrical control circuit for interlocking protection between the brake motor and the main motor provided in an embodiment of the present application. DETAILED DESCRIPTION

[0012] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0013] In the description of this application, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this application.

[0014] In the description of this application, if there is a description of first or second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0015] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0016] Currently, the brake motors and main motors in factories are primarily started and stopped synchronously via the DCS system. Alternatively, some equipment can only start and stop, without interlocking to shut down in the event of a fault. This method of synchronized start and stop of the brake motors and main motors, achieved primarily through the DCS system, results in no interlocking signal between the main motor's high-voltage switchgear and the brake motor, resulting in incomplete protection. In the event of a brake motor fault, the main motor cannot be shut down in an interlocked manner, posing a safety hazard. Furthermore, achieving synchronized start and stop via the DCS system is costly.

[0017] In order to solve the above problems, the present application proposes an electrical control circuit for interlocking protection between the brake motor and the main motor. The embodiments of the present application are further described below in conjunction with the accompanying drawings.

[0018] Reference Figure 1, an embodiment of the present application provides an electrical control circuit for interlocking protection between a brake motor and a main motor, including a control circuit of the brake motor and an auxiliary circuit of a high-voltage switch cabinet of the main motor; the control circuit of the brake motor includes a three-phase power supply wiring, a fuse, a low-voltage circuit breaker, a circuit breaker tripping relay, a motor protector, a low-voltage fault output relay and a main contactor, and the auxiliary circuit of the high-voltage switch cabinet of the main motor includes a high-voltage cabinet start-stop relay, a high-voltage cabinet fault output relay and a high-voltage switch cabinet trip circuit; the fuse is connected in series with the three-phase AC power supply in the three-phase power supply wiring, and one end of the fuse, one end of the power contact of the motor protector, one end of the coil of the low-voltage fault output relay, and one end of the high-voltage cabinet fault output relay are respectively away from the three-phase power supply of the fuse. One end of the three-phase AC power supply in the source wiring is connected, the coil of the circuit breaker trip relay is connected in series with the fuse, the coil of the low-voltage fault output relay is connected in series with the fault output contact of the motor protector, the high-voltage cabinet fault output relay, the high-voltage cabinet start-stop relay, the coil of the main contactor and the protection output contact of the motor protector are connected in series in sequence, one end of the coil of the circuit breaker trip relay away from the fuse, the other end of the power contact of the motor protector, one end of the fault output contact of the motor protector away from the coil of the low-voltage fault output relay and one end of the protection output contact of the motor protector away from the coil of the main contactor are respectively connected to the neutral line in the three-phase power supply wiring, and the normally open contact of the low-voltage fault output relay is connected to the high-voltage switch cabinet trip circuit.

[0019] It should be noted that in Figure 1 In Chinese: L indicates three-phase AC power in three-phase power wiring, N indicates the neutral line in three-phase power wiring, FU indicates fuse, QF indicates low voltage circuit breaker, KA indicates 41 Indicates the coil of the circuit breaker trip relay, KA 42 Indicates the normally open contact of the circuit breaker trip relay, KA 31 Indicates the coil of the low voltage fault output relay, KA 32 Indicates the normally open contact of the low-voltage fault output relay, KM1 indicates the coil of the main contactor, KM2 indicates the normally open contact of the main contactor, KA1 indicates the high-voltage cabinet start-stop relay, KA2 indicates the high-voltage cabinet fault output relay, FH indicates the motor protector, FH1 indicates the protection output contact of the motor protector, FH2 indicates the fault output contact of the motor protector, FH3 indicates the power contact of the motor protector, FH4 indicates the status input common contact of the motor protector, FH5 indicates the contactor status input contact of the motor protector, FH6 indicates the reset status input contact of the motor protector, FH7 indicates the circuit breaker fault input contact of the motor protector, and SK indicates the high-voltage switchgear trip circuit.

[0020] It should be noted that the electrical control circuit for interlocking protection between the brake motor and the main motor set up in this application not only realizes the working requirement of simultaneous start and stop of the main motor and the brake motor, but also solves the defect that the main motor cannot be interlocked and shut down when the brake motor fails, eliminates safety hazards, and realizes dual protection of normal shutdown or failure of the main motor and shutdown of the brake motor, thereby improving the reliability of protection, extending the service life of the equipment, and ensuring its safe, stable and efficient operation. In addition, this control circuit saves costs, is convenient for wiring, and requires little change to the original circuit and installation layout.

[0021] In the present application, the high-voltage cabinet start-stop relay of the control circuit of the brake drawer cabinet realizes the simultaneous start and stop of the brake motor when the high-voltage motor starts or stops; when the brake motor stops due to a fault, its fault signal is led to the high-voltage switch cabinet disconnect circuit through the normally open contact of the low-voltage fault output relay to disconnect the high-voltage circuit breaker. When the main motor fails, the brake motor control circuit can also be disconnected through the normally closed contact of the high-voltage cabinet fault output relay to achieve shutdown; the fault signal caused by the high-voltage switch cabinet of the main motor is a passive normally open contact after being isolated by the low-voltage fault output relay, which effectively prevents the AC power from being connected to the high-voltage DC circuit; similarly, the fault signal caused by the high-voltage switch cabinet of the main motor to the control circuit of the brake motor is a passive normally closed contact after being isolated by the high-voltage cabinet fault output relay, which prevents the DC power from being connected to the AC circuit. Through this setting, the present application can replace the DCS system to realize the simultaneous start and stop of the main motor and the brake motor, and can also realize the dual protection of both motors shutting down when the brake motor or the main motor fails, and the transformation project is small, effectively reducing the later failure rate and saving costs.

[0022] Reference Figure 1 It can be understood that the status input common contact of the motor protector, the contactor status input contact of the motor protector, the reset status input contact of the motor protector and the circuit breaker fault input contact of the motor protector are respectively connected in parallel, the normally open contact of the main contactor and the contactor status input contact of the motor protector are connected in series, and the normally open contact of the circuit breaker trip relay is connected in series with the circuit breaker fault input contact of the motor protector.

[0023] Reference Figure 1 It can be understood that the electrical control circuit for interlock protection between the brake motor and the main motor also includes a reset button, which is connected in series with the circuit breaker fault input contact of the motor protector.

[0024] It should be noted that in Figure 1In the figure, SB represents the reset button. When the brake motor stops due to a fault, its fault signal is led to the high-voltage switch cabinet trip circuit through the normally open contact of the low-voltage fault output relay to disconnect the high-voltage circuit breaker. After the fault is eliminated, the reset button must be manually pressed to restore the fault signal before the equipment can be started and stopped normally. When the main motor fails, the control circuit of the brake motor can also be disconnected through the normally closed contact of the high-voltage cabinet fault output relay to achieve shutdown.

[0025] Reference Figure 1 It can be understood that the control circuit of the brake motor also includes the first lead-in contact of the main motor high-voltage switch cabinet and the second lead-in contact of the main motor high-voltage switch cabinet. The two ends of the first lead-in contact of the main motor high-voltage switch cabinet are respectively connected to the fuse and the high-voltage cabinet fault output relay, and the two ends of the second lead-in contact of the main motor high-voltage switch cabinet are respectively connected to the high-voltage cabinet start-stop relay and the coil of the main contactor.

[0026] It should be noted that in Figure 1 In the figure, S1 represents the first lead-in contact of the main motor high-voltage switchgear, and S2 represents the second lead-in contact of the main motor high-voltage switchgear. By setting the first lead-in contact of the main motor high-voltage switchgear and the second lead-in contact of the main motor high-voltage switchgear, the control circuit of the brake motor and the high-voltage cabinet start-stop relay and the high-voltage cabinet fault output relay in the auxiliary circuit of the main motor high-voltage switchgear are connected.

[0027] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0028] The above is a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications are also considered to be within the scope of protection of the present application.

[0029] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. An electrical control circuit for interlock protection between a brake motor and a main motor, characterized in that: include: The control circuit of the brake motor and the auxiliary circuit of the main motor high-voltage switchgear; The control circuit of the brake motor includes three-phase power supply wiring, fuse, low-voltage circuit breaker, circuit breaker trip relay, motor protector, low-voltage fault output relay and main contactor, and the auxiliary circuit of the main motor high-voltage switch cabinet includes high-voltage cabinet start-stop relay, high-voltage cabinet fault output relay and high-voltage switch cabinet trip circuit; The fuse is connected in series with the three-phase AC power supply in the three-phase power supply wiring. One end of the fuse, one end of the power contact of the motor protector, one end of the coil of the low-voltage fault output relay, and one end of the high-voltage cabinet fault output relay are respectively connected to the end of the fuse away from the three-phase AC power supply in the three-phase power supply wiring. The coil of the circuit breaker trip relay is connected in series with the fuse. The coil of the low-voltage fault output relay is connected in series with the fault output contact of the motor protector. The high-voltage cabinet fault output relay, the high-voltage cabinet start-stop relay, the coil of the main contactor, and the protection output contact of the motor protector are connected in series in sequence. One end of the coil of the circuit breaker trip relay away from the fuse, the other end of the power contact of the motor protector, one end of the fault output contact of the motor protector away from the coil of the low-voltage fault output relay, and one end of the protection output contact of the motor protector away from the coil of the main contactor are respectively connected to the neutral line in the three-phase power supply wiring. The normally open contact of the low-voltage fault output relay is connected to the high-voltage switchgear trip circuit.

2. The electrical control circuit for interlock protection between the brake motor and the main motor according to claim 1, characterized in that: The status input common contact of the motor protector, the contactor status input contact of the motor protector, the reset status input contact of the motor protector and the circuit breaker fault input contact of the motor protector are respectively connected in parallel, the normally open contact of the main contactor is connected in series with the contactor status input contact of the motor protector, and the normally open contact of the circuit breaker trip relay is connected in series with the circuit breaker fault input contact of the motor protector.

3. The electrical control circuit for interlock protection between the brake motor and the main motor according to claim 2, characterized in that: The electrical control circuit for interlock protection between the brake motor and the main motor further includes a reset button, which is connected in series with the circuit breaker fault input contact of the motor protector.

4. The electrical control circuit for interlock protection between the brake motor and the main motor according to claim 1, characterized in that: The control circuit of the brake motor also includes a first lead-in contact of the main motor high-voltage switch cabinet and a second lead-in contact of the main motor high-voltage switch cabinet. The two ends of the first lead-in contact of the main motor high-voltage switch cabinet are respectively connected to the fuse and the high-voltage cabinet fault output relay, and the two ends of the second lead-in contact of the main motor high-voltage switch cabinet are respectively connected to the high-voltage cabinet start-stop relay and the coil of the main contactor.

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