Control system for preventing switch from being pulled and closed by mistake at station end of centralized control station

Abstract

The utility model provides a centralized control station terminal anti-misoperation switch-on and switch-off control system. The system comprises a line identification module, a switch state detection module, an anti-misoperation control circuit, a local control unit, an operation state detection module and a remote monitoring center. The line identification module is used for identifying all lines at the centralized control station end and the output end of the line identification module is connected to the local control unit, and the switch state detection module is used for detecting the state of a switch at the centralized control station end and the output end of the switch state detection module is connected to the local control unit. The running state detection module is used for detecting the running state of the centralized control station end and outputting the running state to the local control unit, the anti-misoperation control circuit is used for controlling the on-off of a power supply loop of a magnet exciting coil of a circuit breaker at the centralized control station end, and the control end of the anti-misoperation control circuit is connected to the local control unit. And the local control unit is in communication connection with the remote monitoring center.

Description

Technical Field

[0001] The utility model relates to an electric power control system, in particular to a control system for preventing mis-closing switches at a centralized control station. Background Art

[0002] In the power system, there are many power equipment in the centralized control station. These power equipment need to detect their status when working, and then control the tripping of the circuit breaker based on the status information to achieve operation protection.

[0003] In the existing technology, telesignaling control, that is, remote control, is generally used for the tripping control of the circuit breaker at the station end of the centralized control station, so as to avoid the defects brought about by manual control in traditional technology, such as avoiding the risk of electric shock during operation of the staff. However, during remote control, the tripping action of the circuit breaker is directly controlled based on the status information of the power equipment (including current, voltage or other operating indicators determined based on current and voltage). However, on the one hand, the position of the circuit breaker switch itself cannot be accurately confirmed and can only be checked by the operation and maintenance personnel, which has the problem of missed detection. On the other hand, the control process is based on the information output by various monitoring devices (such as current sensors, voltage sensors, etc.). This information itself has certain inaccuracies. Therefore, when the circuit breaker trip protection is directly performed, it is easy to cause the risk of power loss of the normal line, thereby affecting the stability of the entire system.

[0004] Therefore, in order to solve the above technical problems, it is urgent to propose a new technical means. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide a centralized control station end anti-misoperation switch control system, which can detect the current information of each line at the centralized control station end and the current and position information of each switch in real time, and set an anti-misoperation control circuit for tripping protection, thereby effectively avoiding the risk of power loss of normal lines when the circuit breaker performs tripping protection, thereby ensuring the stability and reliability of the power system.

[0006] The utility model provides a station-side anti-misoperation switch control system for a centralized control station, comprising a line identification module, a switch status detection module, an anti-misoperation control circuit, a local control unit, an operation status detection module, and a remote monitoring center;

[0007] The line identification module is used to identify each line at the centralized control station end and its output end is connected to the local control unit. The switch status detection module is used to detect the status of the switch at the centralized control station end and its output end is connected to the local control unit. The operation status detection module is used to detect the operation status of the centralized control station end and output it to the local control unit. The anti-misoperation control circuit is used to control the on and off of the power supply circuit of the excitation coil of the circuit breaker at the centralized control station end. The control end of the anti-misoperation control circuit is connected to the local control unit, and the local control unit is communicated with the remote monitoring center.

[0008] Furthermore, the anti-misoperation control circuit includes a first relay, a second relay, a resistor R1, a first remote controller relay, a second remote control relay, and a third remote control relay;

[0009] One end of the normally open switch TJ-K of the first relay is connected to the positive electrode of the DC bus, the other end of the normally open switch TJ-K of the first relay is connected to one end of the auxiliary switch DL of the circuit breaker through the excitation coil TBJ of the second relay, the other end of the auxiliary switch DL of the circuit breaker is connected to the negative electrode of the DC bus through the excitation coil TQ of the circuit breaker, one end of the normally open switch TBJ-K of the second relay is connected to the positive electrode of the DC bus, and the other end of one end of the normally open switch TBJ-K is connected to the common connection point of the normally open switch TJ-K and the excitation coil TBJ through the resistor R1. One end of the normally closed switch BJ-K of the first remote control relay is connected to the positive pole of the DC bus, the other end of the normally closed switch BJ-K is connected to one end of the normally open switch YT-K of the second remote control relay, and the other end of the normally open switch YT-K is connected to the negative pole of the DC bus through the excitation coil YTJ of the third remote control relay. The power supply circuits of the excitation coils of the first relay, the first remote control relay and the second remote control relay are controlled by the relay drive circuit, and the control input end of the relay drive circuit is connected to the control output end of the local control unit.

[0010] Furthermore, the anti-misoperation control circuit also includes a manual switch SD-K, one end of the manual switch SD-K is connected to the positive pole of the DC bus, and the other end of the manual switch SD-K is connected to the common connection point between the normally closed switch BJ-K and the normally open switch YT-K.

[0011] Furthermore, there are three relay drive circuits with the same circuit structure, and the three relay drive circuits respectively control the on and off of the power supply circuits of the excitation coils of the first relay, the first remote control relay, and the second remote control relay;

[0012] The relay drive circuit includes a transistor Q1 and a resistor R2. The transistor relay is connected to the positive pole of the DC bus, the emitter of the transistor Q1 is connected to one end of the resistor R2, the other end of the resistor R2 is connected to the negative pole of the DC bus through the excitation coil J of the relay, and the base of the transistor Q1 is connected to the control output end of the local control unit.

[0013] Furthermore, the line identification module includes a plurality of current sensors, which are respectively arranged at the output end of the power supply and the input end of the load.

[0014] Furthermore, the switch state detection module includes a current sensor and a position sensor, wherein the current sensor is used to detect the current flowing through the switch, and the position sensor is used to detect the position of the switch moving contact.

[0015] Furthermore, the operation status detection module includes a current transformer and a voltage transformer, and the output ends of the current transformer and the voltage transformer are connected to the input end of the local control unit.

[0016] Furthermore, the local controller includes a local controller, a memory and a transmission module;

[0017] The signal input end of the local controller is connected to the output ends of the line identification module, the switch status detection module and the operation status detection module respectively. The control output end of the local controller is used to output control commands to the anti-misoperation control circuit. The local controller is communicated with the remote monitoring center through the transmission module.

[0018] Furthermore, the remote monitoring center includes a monitoring host, a touch display and an alarm. The monitoring host is connected to the local controller through a transmission module, and the touch display and the alarm are connected to the monitoring host.

[0019] Beneficial effects of the present invention: Through the present invention, the current information of each line at the centralized control station end and the current and position information of each switch can be detected in real time, and an anti-misoperation control circuit is set for tripping protection, thereby effectively avoiding the risk of power loss of normal lines when the circuit breaker performs tripping protection, thereby ensuring the stability and reliability of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0021] Figure 1 It is a structural diagram of the present utility model.

[0022] Figure 2 This is a schematic diagram of the structure of the anti-misoperation control circuit of the utility model.

[0023] Figure 3 This is a schematic diagram of the relay drive circuit structure of the present utility model. DETAILED DESCRIPTION

[0024] The utility model is further described in detail below:

[0025] The utility model provides a station-side anti-misoperation switch control system for a centralized control station, comprising a line identification module, a switch status detection module, an anti-misoperation control circuit, a local control unit, an operation status detection module, and a remote monitoring center;

[0026] The line identification module is used to identify each line at the centralized control station end and its output end is connected to the local control unit. The switch status detection module is used to detect the status of the switch at the centralized control station end and its output end is connected to the local control unit. The operation status detection module is used to detect the operation status of the centralized control station end and output it to the local control unit. The anti-misoperation control circuit is used to control the on and off of the power supply circuit of the excitation coil of the circuit breaker at the centralized control station end. The control end of the anti-misoperation control circuit is connected to the local control unit, and the local control unit is communicatively connected to the remote monitoring center. Through the present utility model, the current information of each line at the centralized control station end and the current and position information of each switch can be detected in real time, and the anti-misoperation control circuit is set for tripping protection, thereby effectively avoiding the risk of power loss of normal lines when the circuit breaker performs tripping protection, thereby ensuring the stability and reliability of the power system.

[0027] In this embodiment, the anti-misoperation control circuit includes a first relay, a second relay, a resistor R1, a first remote controller relay, a second remote control relay, and a third remote control relay;

[0028] One end of the normally open switch TJ-K of the first relay is connected to the positive electrode of the DC bus, the other end of the normally open switch TJ-K of the first relay is connected to one end of the auxiliary switch DL of the circuit breaker through the excitation coil TBJ of the second relay, the other end of the auxiliary switch DL of the circuit breaker is connected to the negative electrode of the DC bus through the excitation coil TQ of the circuit breaker, one end of the normally open switch TBJ-K of the second relay is connected to the positive electrode of the DC bus, and the other end of one end of the normally open switch TBJ-K is connected to the common connection point of the normally open switch TJ-K and the excitation coil TBJ through the resistor R1. One end of the normally closed switch BJ-K of the first remote control relay is connected to the positive pole of the DC bus, the other end of the normally closed switch BJ-K is connected to one end of the normally open switch YT-K of the second remote control relay, and the other end of the normally open switch YT-K is connected to the negative pole of the DC bus through the excitation coil YTJ of the third remote control relay. The power supply circuits of the excitation coils of the first relay, the first remote control relay and the second remote control relay are controlled by the relay drive circuit, and the control input end of the relay drive circuit is connected to the control output end of the local control unit.When the local controller needs to trip a certain line for protection based on the current operating status information, such as overcurrent, overvoltage or power failure, the local controller first determines whether the switch position is in the closed state based on the switch position detection module. When the current output value of the switch position detection module is not 0 and the output value of the switch position sensor indicates closed, it indicates that the switch is in the closed state, and the local controller determines whether the current line position is a fault line. The judgment is based on whether the output value of the current transformer of the corresponding line detected by the current sensor is consistent with the set value or the difference is less than the set value. This indicates that the line position is correct, because the current value of each line is generally certain. The local controller uploads the judgment process to the monitoring host. At this time, the controller controls the normally open switch TJ-K of the first relay to close. At this time, the excitation coil TBJ is energized, and the normally open switch TBJ-K is closed, thereby maintaining the tripping current, so that the excitation coil TQ of the circuit breaker remains energized, thereby disconnecting the circuit breaker switch. The auxiliary switch DL of the circuit breaker is a component of the circuit breaker and is disconnected as the circuit breaker switch is disconnected. When the circuit breaker switch is disconnected, DL is also disconnected, thereby executing the tripping action. Completed, the closing time of the normally open switch TJ-K is very short, therefore, the tripping action is maintained through the second relay; when the remote controller center issues a tripping command, the local controller receives the control command to control the second remote controller to close, the excitation coil YTJ is energized, and YTJ-K is closed, thereby executing the tripping protection action. However, when the monitoring host finds that there is a control error (caused by an error in the operating status information, etc.), it issues a command to the local controller to control the normally closed switch BJ-K of the first remote control relay to disconnect, forcibly shutting down the execution of the remote tripping protection command, that is, the remote monitoring The control center can no longer remotely operate the tripping protection action of the circuit breaker. However, there is still a defect. For example, when there is a certain logical error in the monitoring host, an erroneous forced shutdown remote operation will occur. At this time, the anti-misoperation control circuit is further provided with a manual switch SD-K. One end of the manual switch SD-K is connected to the positive pole of the DC bus, and the other end of the manual switch SD-K is connected to the common connection point between the normally closed switch BJ-K and the normally open switch YT-K. The manual switch SD-K is used to forcibly cancel the forced shutdown remote operation command output by the remote monitoring center.

[0029] In this embodiment, there are three relay drive circuits with the same circuit structure, and the three relay drive circuits respectively control the on / off of the power supply circuits of the excitation coils of the first relay, the first remote control relay, and the second remote control relay;

[0030] The relay drive circuit includes a transistor Q1 and a resistor R2. The transistor relay is connected to the positive pole of the DC bus, the emitter of the transistor Q1 is connected to one end of the resistor R2, the other end of the resistor R2 is connected to the negative pole of the DC bus through the excitation coil J of the relay, and the base of the transistor Q1 is connected to the control output end of the local control unit.

[0031] In this embodiment, the line identification module includes a plurality of current sensors, which are respectively arranged at the output end of the power supply and the input end of the load. The current sensors are existing sensors and are not described in detail here.

[0032] In this embodiment, the switch state detection module includes a current sensor and a position sensor. The current sensor is used to detect the current flowing through the switch, and the position sensor is used to detect the position of the switch moving contact. The position sensor adopts an existing sensor and is not described in detail here.

[0033] In this embodiment, the operating status detection module includes a current transformer and a voltage transformer. The output ends of the current transformer and the voltage transformer are connected to the input end of the local control unit. Of course, both the current transformer and the voltage transformer have a front-end processing circuit to rectify, filter and perform analog-to-digital conversion on the signal output by the transformer. This is the existing technology.

[0034] In this embodiment, the local controller includes a local controller, a memory and a transmission module;

[0035] The signal input end of the local controller is respectively connected to the output end of the line identification module, the switch status detection module and the operation status detection module. The control output end of the local controller is used to output a control command to the anti-misoperation control circuit. The local controller is communicatively connected to the remote monitoring center through a transmission module. The local controller adopts an existing single-chip microcomputer, such as an STM32 series single-chip microcomputer, or a PC, etc., and the transmission module adopts an existing Ethernet module, 5G module, etc.

[0036] In this embodiment, the remote monitoring center includes a monitoring host, a touch display and an alarm. The monitoring host is connected to the local controller through a transmission module, and the touch display and the alarm are connected to the monitoring host.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A control system for preventing mis-closing of switches at a centralized control station, characterized in that: It includes a line identification module, a switch status detection module, an anti-misoperation control circuit, a local control unit, an operation status detection module and a remote monitoring center; The line identification module is used to identify each line at the centralized control station end and its output end is connected to the local control unit. The switch status detection module is used to detect the status of the switch at the centralized control station end and its output end is connected to the local control unit. The operation status detection module is used to detect the operation status of the centralized control station end and output it to the local control unit. The anti-misoperation control circuit is used to control the on and off of the power supply circuit of the excitation coil of the circuit breaker at the centralized control station end. The control end of the anti-misoperation control circuit is connected to the local control unit, and the local control unit is communicated with the remote monitoring center.

2. The control system for preventing mis-closing and opening of switches at a centralized control station according to claim 1, characterized in that: The anti-misoperation control circuit includes a first relay, a second relay, a resistor R1, a first remote controller relay, a second remote control relay, and a third remote control relay; One end of the normally open switch TJ-K of the first relay is connected to the positive electrode of the DC bus, the other end of the normally open switch TJ-K of the first relay is connected to one end of the auxiliary switch DL of the circuit breaker through the excitation coil TBJ of the second relay, the other end of the auxiliary switch DL of the circuit breaker is connected to the negative electrode of the DC bus through the excitation coil TQ of the circuit breaker, one end of the normally open switch TBJ-K of the second relay is connected to the positive electrode of the DC bus, and the other end of one end of the normally open switch TBJ-K is connected to the common connection point of the normally open switch TJ-K and the excitation coil TBJ through the resistor R1. One end of the normally closed switch BJ-K of the first remote control relay is connected to the positive pole of the DC bus, the other end of the normally closed switch BJ-K is connected to one end of the normally open switch YT-K of the second remote control relay, and the other end of the normally open switch YT-K is connected to the negative pole of the DC bus through the excitation coil YTJ of the third remote control relay. The power supply circuits of the excitation coils of the first relay, the first remote control relay and the second remote control relay are controlled by the relay drive circuit, and the control input end of the relay drive circuit is connected to the control output end of the local control unit.

3. The control system for preventing mis-closing and opening of a switch at a centralized control station according to claim 2, characterized in that: The anti-misoperation control circuit also includes a manual switch SD-K, one end of which is connected to the positive pole of the DC bus, and the other end of which is connected to the common connection point between the normally closed switch BJ-K and the normally open switch YT-K.

4. The control system for preventing mis-closing and opening of a switch at a centralized control station according to claim 2, characterized in that: There are three relay drive circuits with the same circuit structure, and the three relay drive circuits respectively control the on and off of the power supply circuits of the excitation coils of the first relay, the first remote control relay, and the second remote control relay; The relay drive circuit includes a transistor Q1 and a resistor R2. The transistor relay is connected to the positive pole of the DC bus, the emitter of the transistor Q1 is connected to one end of the resistor R2, the other end of the resistor R2 is connected to the negative pole of the DC bus through the excitation coil J of the relay, and the base of the transistor Q1 is connected to the control output end of the local control unit.

5. The control system for preventing mis-closing and opening of switches at a centralized control station according to claim 1, characterized in that: The line identification module includes a plurality of current sensors, which are respectively arranged at the output end of the power supply and the input end of the load.

6. The control system for preventing mistaken opening and closing of switches at a centralized control station according to claim 1, characterized in that: The switch state detection module includes a current sensor and a position sensor. The current sensor is used to detect the current flowing through the switch, and the position sensor is used to detect the position of the switch moving contact.

7. The control system for preventing mistaken opening and closing of switches at a centralized control station according to claim 1, characterized in that: The operation status detection module includes a current transformer and a voltage transformer, and the output ends of the current transformer and the voltage transformer are connected to the input end of the local control unit.

8. The control system for preventing mis-closing and opening of switches at a centralized control station according to claim 1, characterized in that: The local controller includes a local controller, a memory and a transmission module; The signal input end of the local controller is connected to the output ends of the line identification module, the switch status detection module and the operation status detection module respectively. The control output end of the local controller is used to output control commands to the anti-misoperation control circuit. The local controller is communicated with the remote monitoring center through the transmission module.

9. The control system for preventing mis-closing and opening of switches at a centralized control station according to claim 8, characterized in that: The remote monitoring center includes a monitoring host, a touch display and an alarm. The monitoring host is connected to the local controller through a transmission module, and the touch display and the alarm are connected to the monitoring host.

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