Remote control system of high-voltage electric cabinet

Abstract

The utility model discloses a remote control system for a high-voltage motor cabinet, which is characterized in that a DCS (Distributed Control System) is connected in a machine room, an allowing switch QK is connected between the machine room and the positive electrode of an AC contactor KM, and a high-voltage switch cabinet microcomputer protection device and a circuit breaker operating mechanism are sequentially connected between the machine room and the negative electrode of the AC contactor KM. And branches are arranged between the positive electrode and the negative electrode of the alternating current contactor KM and are respectively connected with a switch cabinet microcomputer protection device output node TS1, a switch cabinet microcomputer protection device output node TS2 and a switch cabinet microcomputer protection device switching value point SI. According to the system, on the premise that an original field starting mode of a high-voltage motor is reserved, an intermediate relay and an expansion node are additionally arranged in a control loop by utilizing internal output and input nodes of a microcomputer protection device of the high-voltage motor cabinet, so that a starting loop of the high-voltage motor cabinet is improved; the remote permission giving function in the starting process of the high-voltage motor of the unattended power transformation (distribution) station is achieved by combining remote control instructions of a centralized control station, remote signaling signal sending and the like, and intelligence and high efficiency are achieved.

Description

Technical Field

[0001] This utility model relates to the field of motor starting equipment, specifically to a remote control system for a high-voltage motor cabinet. Background Technology

[0002] High-voltage motor cabinets, also known as high-voltage motor starter cabinets, are electrical devices used to control and protect high-voltage motors. They are suitable for AC 50Hz (60Hz) power networks with voltages from 3KV to 10KV, and are used for starting, stopping, and operating high-voltage wound-rotor motors that are irreversible, non-speed-adjustable, and do not require braking. They play a crucial role in the starting, running, and stopping of high-voltage motors, ensuring safe, stable, and efficient operation, and protecting the motor and other related equipment from electrical faults. They are widely used in driving large water pumps, fans, ball mills, rolling mills, compressors, crushers, and belt conveyors.

[0003] However, when starting the high-voltage motor cabinet, the operators of the central control station need to go to the unattended substation motor high-voltage switch cabinet site to "open" the QK permission switch and perform the "permission" operation. The user then starts the high-voltage motor through the DCS control system or by opening the switch. After the motor starts normally, the operators need to go to the site again to "break" the QK permission switch. As the production system continues to expand, the number of positions in charge of the power plant power supply system operation team is increasing. The following problems exist in the "permission" operation process of the high-voltage motor cabinet site: (1) The operators frequently travel to and from the site, resulting in high work intensity and long power supply time; (2) The operation team has many unattended positions and is scattered. The on-site permission operation requires vehicle cooperation, resulting in low labor productivity; (3) There are significant safety hazards for the operators to go to the substation for on-site operation. Utility Model Content

[0004] This utility model provides a remote control system for high-voltage motor cabinets, which aims to solve the problem that the start-up of existing high-voltage motor cabinets requires manual back-and-forth operation, which is time-consuming and poses significant safety hazards.

[0005] To achieve its purpose, this utility model adopts the following technical solution:

[0006] A remote control system for a high-voltage motor cabinet includes a machine room and an AC contactor KM. A control system DCS is connected to the machine room. An allowable switch QK is connected between the machine room and the positive terminal of the AC contactor KM. A high-voltage switchgear microprocessor protection device and a circuit breaker operating mechanism are sequentially connected between the machine room and the negative terminal of the AC contactor KM. The circuit breaker operating mechanism includes a motor protection switch DL and a closing coil HQ connected in sequence. A branch is provided between the positive and negative terminals of the AC contactor KM, connecting the switchgear microprocessor protection device output node TS1, the switchgear microprocessor protection device output node TS2, and the switchgear microprocessor protection device switching point SI, respectively.

[0007] The switch cabinet microcomputer protection device output node TS1 is connected in sequence to the negative terminal of AC contactor KM via intermediate relay KA1 and motor protection switch DL.

[0008] An intermediate relay KA2 is connected between the output node TS2 of the microcomputer protection device of the switch cabinet and the negative terminal of the AC contactor KM.

[0009] An intermediate relay KA1 is connected between the switching quantity point SI of the microcomputer protection device in the switch cabinet and the positive terminal of the AC contactor KM.

[0010] Furthermore, intermediate relays KA1 and KA2 are connected between the positive terminal of AC contactor KM and the output terminal TS1 of the microcomputer protection device in the switchgear.

[0011] Furthermore, an intermediate relay KA1 is connected between the positive terminal of the AC contactor KM and the enable switch QK.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] The high-voltage motor cabinet remote control system provided by this utility model, while retaining the original on-site starting method of the high-voltage motor, utilizes the output and input nodes inside the microcomputer protection device of the high-voltage motor cabinet, adds intermediate relays to the control circuit, expands the nodes, and improves the starting circuit of the high-voltage motor cabinet. Combined with the remote control command and remote signal transmission of the central control station, it realizes the "remote permission" function in the high-voltage motor starting process of unattended substations. This system eliminates the need for operators to frequently travel to the site, reduces labor intensity, improves power supply efficiency and labor productivity, greatly shortens power supply time, and eliminates the significant safety hazards of operators going to the substation for on-site operation. It is intelligent and efficient. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the remote control system for the high-voltage motor cabinet of this utility model.

[0015] Figure 2This is a flowchart illustrating the startup process of the remote control system for the high-voltage motor cabinet of this utility model.

[0016] Figure 3 A comparison diagram of the motor cabinet startup procedure before and after improvement;

[0017] In the diagram: 1-Machine room; 2-Microcomputer protection device for high-voltage switchgear; 3-Circuit breaker operating mechanism; KM-AC contactor; QK-Allowing switch; DL-Motor protection switch; HQ-Closing coil; TS1-Output node of microcomputer protection device for switchgear; TS2-Output node of microcomputer protection device for switchgear; SI-Switching point of microcomputer protection device for switchgear; KA1-Intermediate relay; KA2-Intermediate relay. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings:

[0019] like Figure 1 As shown, a remote control system for a high-voltage motor cabinet includes a control room 1 and an AC contactor KM. A control system DCS is connected to the control room 1. An allowable switch QK is connected between the control room 1 and the positive terminal of the AC contactor KM. A high-voltage switchgear microprocessor protection device 2 and a circuit breaker operating mechanism 3 are sequentially connected between the control room 1 and the negative terminal of the AC contactor KM. The circuit breaker operating mechanism 3 includes a motor protection switch DL and a closing coil HQ connected in sequence. A branch is provided between the positive and negative terminals of the AC contactor KM, respectively connecting to the switchgear microprocessor protection device output node TS1, the switchgear microprocessor protection device output node TS2, and the switchgear microprocessor protection device switching point SI.

[0020] The switch cabinet microcomputer protection device output node TS1 is connected in sequence to the negative terminal of AC contactor KM via intermediate relay KA1 and motor protection switch DL; the AC contactor KM positive terminal is connected to the switch cabinet microcomputer protection device output node TS1 via intermediate relay KA1 and intermediate relay KA2.

[0021] An intermediate relay KA2 is connected between the output node TS2 of the microcomputer protection device of the switch cabinet and the negative terminal of the AC contactor KM.

[0022] An intermediate relay KA1 is connected between the switching point SI of the microcomputer protection device of the switch cabinet and the positive terminal of the AC contactor KM.

[0023] An intermediate relay KA1 is connected between the positive terminal of the AC contactor KM and the enable switch QK.

[0024] like Figure 1-3 As shown, the remote control process of the high-voltage motor cabinet remote control system of this utility model is as follows:

[0025] 1. "Remote Permission" given: The output node TS1 of the microcomputer protection device of the drive switch cabinet is activated, the coil of intermediate relay KA1 is energized, and the normally open node of intermediate relay KA1 is closed. While forming a self-holding circuit, the "Remote Permission" given circuit allows the bypass connection of switch QK. The user can start the high-voltage motor through the DCS control system or the field motor starter switch.

[0026] 2. "Remote Permission" Cancellation: After the high-voltage motor cabinet starts normally, the normally closed node of the high-voltage short circuit breaker connected in series in the "Remote Permission" given circuit opens, and the "Remote Permission" circuit can be automatically cancelled; if the user does not start for a long time or the motor fails to start, the output node TS2 of the microcomputer protection device of the drive switch cabinet can be activated, the coil of the intermediate relay KA2 is energized, the normally closed node of the intermediate relay KA2 in the "Remote Permission" given self-holding circuit opens, and the "Remote Permission" is cancelled.

[0027] 3. "Remote Permission" Given Signal Circuit: Connect the normally open terminal of intermediate relay KA1 to the switch quantity point SI signal circuit of the microcomputer protection device in the switch cabinet. When the "remote permission" is successfully given, a "remote permission" given signal is issued; when the "remote permission" is deactivated, the given signal is deactivated.

Claims

1. A remote control system for a high-voltage motor cabinet, comprising a machine room (1) and an AC contactor KM, wherein a control system DCS is connected in the machine room (1), an allowable switch QK is connected between the machine room (1) and the positive terminal of the AC contactor KM, and a high-voltage switch cabinet microcomputer protection device (2) and a circuit breaker operating mechanism (3) are sequentially connected between the machine room (1) and the negative terminal of the AC contactor KM; the circuit breaker operating mechanism (3) comprises a motor protection switch DL and a closing coil HQ connected in sequence, characterized in that: The AC contactor KM has a branch circuit between its positive and negative terminals, which is respectively connected to the switch cabinet microcomputer protection device output node TS1, switch cabinet microcomputer protection device output node TS2, and switch cabinet microcomputer protection device switching point SI. The switch cabinet microcomputer protection device output node TS1 is connected in sequence to the negative terminal of AC contactor KM via intermediate relay KA1 and motor protection switch DL. An intermediate relay KA2 is connected between the output node TS2 of the microcomputer protection device of the switch cabinet and the negative terminal of the AC contactor KM. An intermediate relay KA1 is connected between the switching quantity point SI of the microcomputer protection device in the switch cabinet and the positive terminal of the AC contactor KM.

2. The remote control system for a high-voltage motor cabinet as described in claim 1, characterized in that: Intermediate relays KA1 and KA2 are connected between the positive terminal of the AC contactor KM and the output node TS1 of the microcomputer protection device of the switch cabinet.

3. The remote control system for a high-voltage motor cabinet as described in claim 2, characterized in that: An intermediate relay KA1 is connected between the positive terminal of the AC contactor KM and the enable switch QK.

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