System for remotely controlling shaking-in or shaking-out of circuit breaker of 10kV high-voltage cabinet

Abstract

The utility model discloses a system for remotely controlling a 10kV high-voltage cabinet circuit breaker to be rocked in or out, which comprises a high-voltage cabinet, a stepping motor, a stepping driver, a PLC (Programmable Logic Controller), a first photoelectric conversion module, a second photoelectric conversion module and an industrial control upper computer, and is characterized in that a lead screw of a high-voltage circuit breaker trolley penetrates through a box door of the high-voltage cabinet and extends to the outer side of the high-voltage cabinet; the stepping motor is in transmission connection with the high-voltage circuit breaker trolley, the tray support is fixed to the outer side of the high-voltage cabinet door, the stepping motor is fixed to the tray support, the stepping driver is electrically connected with the PLC and the stepping motor, the PLC is connected with the first photoelectric conversion module, the first photoelectric conversion module is connected with the second photoelectric conversion module, and the second photoelectric conversion module is connected with the high-voltage circuit breaker trolley. And the second photoelectric conversion module is connected with the industrial control upper computer. According to the utility model, the structure is flexible, a remote control mode is adopted, the problem of on-site manual operation of a transformer substation operator to a 10kV high-voltage cabinet is solved, the labor intensity of electrical personnel is reduced, and the personnel safety is guaranteed.

Description

Technical Field:

[0001] The utility model relates to the technical field of remote control, in particular to a system for remotely controlling the insertion or extraction of a 10kV high-voltage switch cabinet circuit breaker. Background Art:

[0002] The 35kV substation in the mine is located in a relatively remote area. The limestone crusher needs to be switched between daily operation and maintenance. Each time the crusher is started and stopped for maintenance, electrical workers are required to perform the operation of inserting or extracting the 10kV high-voltage switch cabinet circuit breaker to ensure that the equipment can be started and maintained on time.

[0003] Currently, when the limestone crusher is shut down for maintenance, to ensure the safety of the maintenance workers entering the crusher, electrical personnel need to go to the site of the 10kV high-voltage switch cabinet circuit breaker each time and manually extract the 10kV high-voltage switch cabinet circuit breaker to the test (maintenance) position. Before starting the machine and starting operation, electrical personnel go to the site of the 10kV high-voltage switch cabinet crusher circuit breaker and manually insert the 10kV high-voltage switch cabinet circuit breaker to the working position. To ensure that the high-voltage switch cabinet circuit breaker is extracted to the maintenance position and inserted to the working position, the insertion and extraction of the high-voltage switch cabinet circuit breaker need to be completed by professional electrical personnel. When extraction is required, electrical personnel must wait for the crusher to stop before performing the extraction work. Before starting the equipment, they also need to go to the site to insert the high-voltage switch cabinet circuit breaker, resulting in high labor intensity and long working hours for the workers. In addition, there are certain safety hazards for workers to operate the 10kV high-voltage switch cabinet circuit breaker on site. Summary of the Utility Model:

[0004] The purpose of the utility model is to provide a system for remotely controlling the insertion or extraction of a 10kV high-voltage switch cabinet circuit breaker, which can remotely realize the insertion and extraction of the 10kV high-voltage switch cabinet circuit breaker without electrical personnel going to the site of the high-voltage switch cabinet.

[0005] The utility model is implemented by the following technical scheme: a remote control 10kV high-voltage cabinet circuit breaker swinging in or out system, including a high-voltage cabinet, a high-voltage circuit breaker trolley is arranged in the high-voltage cabinet, and the high-voltage circuit breaker trolley is provided with a maintenance limit switch and a working limit switch, and the screw rod of the high-voltage circuit breaker trolley passes through the box door of the high-voltage cabinet and extends to the outside of the high-voltage cabinet. It is characterized in that it also includes a stepper motor, a stepper driver, a PLC controller, a first photoelectric conversion module, a second photoelectric conversion module and an industrial control host computer, and the tray bracket is fixedly connected to the outside of the box door of the high-voltage cabinet, and the stepper motor is fixedly arranged on the tray bracket. The output shaft of the stepper motor is connected to the screw rod of the high-voltage circuit breaker trolley through a coupling. The motor is electrically connected to the stepper driver, the PLC controller is electrically connected to the stepper driver, the stepper driver can receive a pulse signal sent by the PLC controller and convert it into a drive current signal, the PLC controller is connected to the Ethernet communication interface of the first photoelectric conversion module, the first photoelectric conversion module is connected to the second photoelectric conversion module through an optical cable, the second photoelectric conversion module is connected to the Ethernet communication interface of the industrial control host computer, the PLC controller receives instructions for operations on the industrial control host computer through the second photoelectric conversion module, the optical cable and the first photoelectric conversion module, and the PLC controller feeds back the signal to the industrial control host computer for signal status display.

[0006] Furthermore, the maintenance limit switch and the working limit switch are electrically connected to the PLC controller respectively. When the high-voltage circuit breaker trolley is swung to the working position, the working limit switch is closed and the maintenance limit switch is disconnected. When the high-voltage circuit breaker trolley is swung to the maintenance position, the maintenance limit switch is closed and the working limit switch is disconnected.

[0007] Advantages of the utility model: The utility model uses a PLC controller to write the corresponding stepper motor manual / automatic control program and the corresponding password algorithm, and adopts a photoelectric converter to communicate to the remote background industrial control host computer operation interface through an optical cable Ethernet. Through the manual / automatic selection of the industrial control host computer, the stepper motor can be controlled in the manual / automatic mode for forward and reverse rotation, and the swinging in and out of the 10kV high-voltage cabinet circuit breaker can be remotely realized. There is no need for electrical personnel to go to the high-voltage cabinet site, which reduces the labor intensity of electrical personnel and ensures personnel safety. Description of the drawings:

[0008] Figure 1 This is a schematic diagram of the control system of a 10kV high-voltage cabinet circuit breaker of the utility model;

[0009] Figure 2 This is a schematic diagram of the high-voltage circuit breaker trolley and stepper motor structure of the utility model;

[0010] Figure 3This is a schematic diagram of the structure of the trolley of a 10kV high-voltage circuit breaker of the present utility model;

[0011] Figure 4 This is a logic operation block diagram of the PLC controller of the present utility model.

[0012] In the figure: 1, stepping motor; 2, coupling; 3, high-voltage cabinet; 4, tray support; 5, trolley of high-voltage circuit breaker; 6, working limit switch; 7, maintenance limit switch. Specific implementation manners:

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0014] As Figures 1-4 shown, a system for remotely controlling the insertion or extraction of a 10kV high-voltage cabinet circuit breaker includes a high-voltage cabinet. A trolley of a high-voltage circuit breaker 5 is provided in the high-voltage cabinet. A working limit switch 6 and a maintenance limit switch 7 are provided on the trolley of the high-voltage circuit breaker 5. The lead screw of the trolley of the high-voltage circuit breaker 5 passes through the cabinet door of the high-voltage cabinet 3 and extends to the outside of the high-voltage cabinet;

[0015] It further includes a stepping motor 1, a stepping driver, a PLC controller, a first optoelectronic conversion module, a second optoelectronic conversion module, and an industrial control upper computer;

[0016] The stepping motor 1 is fixedly connected to the cabinet door of the high-voltage switch cabinet 3. A tray support 4 is fixedly arranged on the outer side of the cabinet door of the high-voltage switch cabinet 3, and the stepping motor 1 is fixed on the tray support 4. The stepping motor 1 is used in conjunction with a speed reducer. The output shaft of the stepping motor 1 is in transmission connection with the lead screw of the high-voltage circuit breaker trolley 5 through a coupling 2. The stepping motor 1 drives the screw rod of the lead screw to rotate, and the screw rod drives the lead screw nut to move linearly. The lead screw nut is fixedly connected to the high-voltage switch cabinet circuit breaker, and the lead screw nut drives the high-voltage switch cabinet circuit breaker to move back and forth, realizing the rocking-in and rocking-out operations of the high-voltage switch cabinet circuit breaker. The stepping motor 1 is electrically connected to the stepping driver. The PLC controller is connected to the Ethernet communication interface of the first optoelectronic conversion module. The stepping driver can receive the pulse signal sent by the PLC controller and convert it into a drive current signal, thereby controlling the angular displacement of the stepping motor. The rotation speed of the motor is proportional to the pulse frequency. The second optoelectronic conversion module is connected to the Ethernet communication interface of the industrial control host computer. The first optoelectronic conversion module is connected to the second optoelectronic conversion module through an optical cable. The PLC controller receives the operation instructions on the industrial control host computer through the second optoelectronic conversion module, the optical cable, and the first optoelectronic conversion module. At the same time, the PLC controller feeds back the signal to the industrial control host computer for signal status display.

[0017] In this embodiment, Siemens SMART200 PLC is used as the control signal source of the stepping motor 1, and the control program and signal interlock of the stepping motor 1 are compiled to send corresponding pulse and forward and reverse signals to the stepping motor controller, thereby controlling the forward and reverse rotation of the stepping motor 1.

[0018] Both the maintenance limit switch 7 and the working limit switch 6 are electrically connected to the PLC controller. When the high-voltage circuit breaker trolley 5 is rocked to the working position, the working limit switch 6 closes and the maintenance limit switch 7 opens. When the high-voltage circuit breaker trolley 5 is rocked into the maintenance position, the maintenance limit switch 7 closes and the working limit switch 6 opens.

[0019] The operation logic of the PLC controller is as Figure 4As shown in the figure, the operator selects the manual / automatic mode on the industrial control host computer. In the automatic mode, the PLC controller reads the pre-set in-rolling or out-rolling time of the system. After the crusher stops, the on-site operator transmits the breaker opening signal to the PLC controller through the DCS. When the system time is equal to the programmed time and there is a breaker opening signal, the stepping driver is powered on. With a 2-second delay after the opening signal, the PLC controller sends the set number of pulses and the forward / reverse signal to the stepping driver. The stepping motor 1 rotates forward or backward according to the set direction and pulses to drive the high-voltage circuit breaker trolley 5 forward to the working position or backward to the maintenance position. When the stepping motor 1 has executed the set number of pulses and the high-voltage circuit breaker trolley 5 just touches the working limit switch 6 or the maintenance limit switch 7, it indicates that the trolley has reached the working position or the maintenance position. The PLC controller receives the signal that the high-voltage circuit breaker trolley 5 has reached the working position or the maintenance position and delays for 3 seconds to disconnect the power supply of the stepping driver to complete the work.

[0020] In the manual mode, the PLC controller reads the system time to obtain the dynamic password. After the correct dynamic password is input on the industrial control host computer, the stepping driver is powered on. The validity period of the dynamic password is 5 seconds. After the validity period, a new dynamic password needs to be obtained. After the industrial control host computer issues the in-rolling or out-rolling command within 5 seconds, the PLC controller sends the set number of pulses and the forward / reverse direction signal to the stepping driver. The stepping motor 1 rotates forward or backward according to the set direction and the number of pulses to drive the high-voltage circuit breaker trolley 5 forward to the working position or backward to the maintenance position. When the stepping motor 1 has executed the set number of pulses and the high-voltage circuit breaker trolley 5 in-rolls or out-rolls and touches the working limit switch 6 or the maintenance limit switch 7, it indicates that the high-voltage circuit breaker trolley 5 has reached the working position or the maintenance position. The PLC controller receives the signal that the high-voltage circuit breaker trolley 5 has reached the working position or the maintenance position and delays for 3 seconds to disconnect the power supply of the stepping driver to complete the work.

[0021] The present utility model also has an image acquisition camera. The image acquisition camera is electrically connected to the industrial control host computer, and the acquired image is transmitted to the display interface of the industrial control host computer, so as to monitor the in-rolling and out-rolling positions of the high-voltage cabinet breaker, ensure that the 10kV high-voltage cabinet breaker is in the correct position, and play a calibration role. The operation interface of the industrial control host computer also has functions such as a manual / automatic conversion switch, breaker position display, password input, breaker status display, and stepping driver power-off.

[0022] In the automatic mode, according to the set time, when the high-voltage switch cabinet circuit breaker receives the shutdown signal of the controlled equipment, it automatically withdraws the high-voltage switch cabinet circuit breaker to the maintenance position of the 10kV high-voltage switch cabinet through delay setting. Maintenance staff then carry out maintenance, set the next time for the high-voltage switch cabinet circuit breaker to be inserted, and when the set time arrives, it automatically inserts the high-voltage switch cabinet circuit breaker into the working position of the 10kV high-voltage switch cabinet to prepare for the start of the controlled crusher. In the manual mode, after the crusher equipment stops, the maintenance staff notify the personnel in the remote headquarters duty room to manually withdraw the 10kV high-voltage switch cabinet to the maintenance position on the industrial control upper computer. The industrial control upper computer has an indication mark for the test (maintenance) position. When starting the machine next time, the on-site personnel notify the headquarters duty room personnel to manually insert the 10kV high-voltage switch cabinet to the working position on the industrial control upper computer, and it is okay when the industrial control upper computer shows that the high-voltage switch cabinet circuit breaker is in the working position. The dynamic password is controlled by a dedicated person for authorization, and after the high-voltage switch cabinet circuit breaker is withdrawn to the test (maintenance) position, the stepper motor 1 and the stepper driver are in a power-off state. Only when receiving the command to insert the high-voltage switch cabinet circuit breaker the next day and entering the correct password, the stepper motor 1 and the stepper driver are powered on, and the industrial control upper computer issues an insertion command within the specified time.

[0023] Working principle:

[0024] In the automatic mode, the operation of withdrawing the high-voltage switch cabinet circuit breaker is as follows: When the limestone crusher stops running normally, the PLC controller automatically detects the circuit breaker opening signal. After the PLC controller receives the circuit breaker opening signal, it determines the withdrawal time according to the system preset in advance. When the set withdrawal time arrives, the PLC controller automatically issues a certain number of pulses and a reverse command according to the running distance of the high-voltage switch cabinet circuit breaker to control the reverse rotation of the stepper motor 1. The stepper motor 1 drives the screw of the high-voltage circuit breaker trolley 5 to rotate, and the screw of the high-voltage circuit breaker trolley 5 drives the high-voltage switch cabinet circuit breaker to be withdrawn. When the high-voltage switch cabinet circuit breaker is withdrawn to the maintenance position, it touches the maintenance limit switch 7. At this time, the maintenance limit switch 7 closes and the working limit switch 6 opens. The maintenance limit switch 7 feeds back the signal that the high-voltage switch cabinet circuit breaker has reached the maintenance position to the PLC controller. After the PLC controller receives the signal that the high-voltage circuit breaker trolley 5 has reached the maintenance position, it disconnects the power supply of the stepper driver after a 3-second delay, and the high-voltage switch cabinet circuit breaker is withdrawn to the maintenance position, completing the operation.

[0025] Perform the in-rolling operation on the high-voltage cabinet circuit breaker in automatic mode: Set the in-rolling time of the high-voltage cabinet circuit breaker in advance in the PLC controller program. When the circuit breaker is in the open state and the system time is equal to the set in-rolling time, the PLC controller automatically sends a certain number of pulses and a positive command according to the running distance of the high-voltage cabinet circuit breaker to control the forward rotation of the stepper motor 1. The stepper motor 1 drives the lead screw of the high-voltage circuit breaker trolley 5 to rotate, and the lead screw of the high-voltage circuit breaker trolley 5 drives the high-voltage cabinet circuit breaker to roll in. When the high-voltage cabinet circuit breaker rolls in to the working position and touches the working limit switch 6, at this time the working limit switch 6 closes and the maintenance limit switch 7 opens. The working limit switch 6 feeds back the signal that the high-voltage cabinet circuit breaker has reached the working position to the PLC controller. After the PLC controller receives the signal that the high-voltage circuit breaker trolley 5 has reached the working position, it delays for 3 seconds and then disconnects the power supply of the stepper driver. The high-voltage circuit breaker trolley 5 rolls into the working position and the work is completed.

[0026] Perform the out-rolling operation on the high-voltage cabinet circuit breaker in manual mode: After the staff enters the correct password on the industrial control upper computer, they send an out-rolling command to the PLC controller. After the PLC controller receives the out-rolling command, it sends a pre-set pulse signal and a reverse signal to the stepper driver. The stepper driver controls the stepper motor 1 to reverse. The stepper motor 1 drives the lead screw of the high-voltage circuit breaker trolley 5 to reverse, and the lead screw of the high-voltage circuit breaker trolley 5 drives the high-voltage cabinet circuit breaker to roll out. When the high-voltage cabinet circuit breaker rolls out to the maintenance position and touches the maintenance limit switch 7, at this time the maintenance limit switch 7 closes and the working limit switch 6 opens. The maintenance limit switch 7 feeds back the signal that the high-voltage cabinet circuit breaker has reached the maintenance position to the PLC controller. After the PLC controller receives the signal that the high-voltage circuit breaker trolley 5 has reached the maintenance position, it delays for 3 seconds and then disconnects the power supply of the stepper driver. After the signal delays for 3 seconds, it disconnects the power supply of the stepper driver and the work is completed;

[0027] Perform the in-rolling operation on the high-voltage cabinet circuit breaker in manual mode: After the staff enters the correct password on the industrial control upper computer, they send an in-rolling command to the PLC controller. After the PLC controller receives the in-rolling command, it sends a pre-set pulse signal and a forward signal to the stepper driver. The stepper driver controls the stepper motor 1 to rotate forward. The stepper motor 1 drives the lead screw of the high-voltage circuit breaker trolley 5 to rotate forward, and the lead screw of the high-voltage circuit breaker trolley 5 drives the high-voltage cabinet circuit breaker to roll in. When the high-voltage cabinet circuit breaker rolls in to the working position and touches the working limit switch 6, at this time the working limit switch 6 closes and the maintenance limit switch 7 opens. The working limit switch 6 feeds back the signal that the high-voltage cabinet circuit breaker has reached the working position to the PLC controller. After the PLC controller receives the signal that the high-voltage circuit breaker trolley 5 has reached the working position, it delays for 3 seconds and then disconnects the power supply of the stepper driver. The high-voltage circuit breaker trolley 5 rolls into the working position and the work is completed.

[0028] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A remote control system for swinging in or out a 10kV high-voltage cabinet circuit breaker, comprising a high-voltage cabinet, a high-voltage circuit breaker trolley arranged in the high-voltage cabinet, a maintenance limit switch and a working limit switch arranged on the high-voltage circuit breaker trolley, a screw rod of the high-voltage circuit breaker trolley extending through the door of the high-voltage cabinet to the outside of the high-voltage cabinet, characterized in that: It also includes a stepper motor, a stepper driver, a PLC controller, a first photoelectric conversion module, a second photoelectric conversion module and an industrial control host computer. A tray bracket is fixed on the outer side of the box door of the high-voltage cabinet, and the stepper motor is fixed on the tray bracket. The output shaft of the stepper motor is connected to the screw drive of the high-voltage circuit breaker trolley through a coupling, the stepper motor is electrically connected to the stepper driver, the PLC controller is electrically connected to the stepper driver, the stepper driver can receive a pulse signal sent by the PLC controller and convert it into a driving current signal, the PLC controller is connected to the Ethernet communication interface of the first photoelectric conversion module, the first photoelectric conversion module is connected to the second photoelectric conversion module through an optical cable, the second photoelectric conversion module is connected to the Ethernet communication interface of the industrial control host computer, the PLC controller receives the operation instructions on the industrial control host computer through the second photoelectric conversion module, the optical cable and the first photoelectric conversion module, and the PLC controller feeds back the signal to the industrial control host computer for signal status display.

2. A remote control system for swinging in or out a 10kV high voltage cabinet circuit breaker according to claim 1, characterized in that: The maintenance limit switch and the working limit switch are electrically connected to the PLC controller respectively. When the high-voltage circuit breaker trolley is swung to the working position, the working limit switch is closed and the maintenance limit switch is disconnected. When the high-voltage circuit breaker trolley is swung to the maintenance position, the maintenance limit switch is closed and the working limit switch is disconnected.

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