CN202103419U - Device for uniformly controlling and selecting open circuits to distributed arc suppression coils of sectionalized busbars in substation - Google Patents

Abstract

A unified control and line selection device for distributed arc-suppression coils of substation segmental busbars, through interconnected unified control unit, human-computer interaction interface, line signal conditioning module and command distribution module; through the unified control unit as the core, The input information is processed and calculated, and the arc suppressing coil and its damping resistance are controlled by outputting command information. This centralized and unified control solves the problem of mutual coordination of parallel operation, and at the same time can save costs and improve system reliability; in addition It can also adjust the operating conditions of each arc-suppression coil according to the real-time tracking of changes in the operation mode of the substation's segmented bus, realizing the fully automatic operation of the distributed arc-suppression coils of the substation, which is more suitable for the work requirements of today's substations, and the compensation of arc-suppression coils The effect is more ideal and suitable for the future development of the power grid.

Description

Unified Control and Line Selection Device of Distributed Arc Suppression Coils of Substation Sectional Bus

technical field

The utility model belongs to the technical field of automatic tracking arc-suppression coil control, in particular to a unified control and line selection device for distributed arc-suppression coils of a substation busbar.

Background technique

With the continuous increase of power demand, the power load gradually increases, and the voltage level of the substation gradually increases. According to the former Ministry of Electric Power Industry's "Overvoltage Protection and Insulation Coordination of AC Electrical Installations" and "Technical Regulations for Overvoltage Protection Design of Electrical Equipment", arc suppression coils should be installed when the single-phase ground fault capacitor current of the 3-66kV system exceeds 10A. Nowadays, the number of outgoing lines of 10kV busbars in substations is increasing, and segmented busbars are widely used. The control problem of simultaneous operation of multiple arc suppression coils needs to be solved. The current control method of distributed arc suppression coils is single. Each arc suppression coil has a corresponding controller. The core controller mainly performs human-computer interaction and communication, and the parallel operation between arc suppression coils has not been solved. At the same time, the switching of multi-section circuit breakers on the bus leads to frequent changes in the operation mode of the bus. How to track the changes in the operation mode of the substation bus from time to time and control the arc suppression coils has become an urgent problem to be solved.

Contents of the invention

In order to overcome the deficiencies in the prior art above, the purpose of this utility model is to provide a unified control and line selection device for the distributed arc-suppression coils of substation busbars. The centralized and unified control of the device solves the mutual Coordination problems can save costs and improve system reliability; in addition, the operating conditions of each arc suppression coil can be adjusted according to the real-time tracking of changes in the substation busbar operation mode, realizing the fully automatic operation of the distributed arc suppression coils in the substation. It is more suitable for the working needs of today's substations, and the compensation effect of the arc suppression coil is more ideal, which is suitable for the future development of the power supply grid.

In order to achieve the above object, the technical solution adopted in the utility model is:

A unified control and line selection device for distributed arc-suppression coils of substation busbars, including a unified control unit 1 electrically connected to a power supply module 2, with a core processor 3 inside the unified control unit 1, and a unified control unit 1 The signal input port 4 of the human-computer interaction interface 5 is communicatively connected with the input device 6 such as the keyboard or mouse, and the signal output port 7 of the unified control unit 1 is communicatively connected with the display output device 8 in the human-computer interaction interface 5 for unified control. The state input port 9 of the unit 1 is communicatively connected with the state output port 11 of the line signal conditioning module 10, and the data input port 12 of the line signal conditioning module 10 is connected with the circuit breaker data output port 14 and the arc suppression coil 15 of the section circuit breaker 13 The coil data output port 16 and its circuit PT are connected to the zero sequence CT, the control port 17 of the unified control unit 1 and the command input port 19 of the command distribution module 18 are connected through the CAN bus 20, and the command output of the command distribution module 18 The port 21 is communicatively connected with the controlled port 22 of the arc suppressing coil 15 .

The core processor 3 includes calculating the grid capacitance current and the arc-suppression coil 15 needs to adjust gears, detecting line faults, selecting short-circuit lines and calculating the timing of switching damping resistance, and performing grid capacitance current and arc-suppression coil 15 needs. The method of calculating the shift position is to use the two-point method and the mountain-climbing method. The arc-suppression coil is pre-adjusted by calculating the capacitance current of the grid. The way to detect the line fault is to select the short-circuit line based on the rise of the neutral point voltage. The method is to calculate the active power of each line through the active component method and judge the grounding line.

The line signal conditioning module 10 collects the working status of the section circuit breaker 13 and the arc suppression coil 15 and the electrical quantity of the line, including neutral point voltage and zero sequence current.

The unified control unit 1 sends the control command to the command distribution module 18 through the CAN bus, and performs coordinated control on the arc suppression coil 15 and its damping resistance through signal conditioning and amplification.

By using the unified control unit 1 as the core, the input information is processed and calculated, and the arc suppression coil 15 and its damping resistance are controlled by outputting instruction information. Such centralized and unified control solves the mutual coordination problem of parallel operation, and at the same time It can save costs and improve system reliability; in addition, it can also adjust the operating conditions of each arc-suppression coil according to the real-time tracking of changes in the operation mode of the substation's segmented bus, realizing the fully automatic operation of the distributed arc-suppression coils of the substation, which is more suitable for today's According to the working requirements of the substation, the compensation effect of the arc suppression coil is more ideal, which is suitable for the future development of the power supply grid.

Description of drawings

Accompanying drawing is the structural representation of the utility model.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described in more detail.

As shown in the attached figure, the unified control and line selection device of the distributed arc-suppression coil of the substation busbar includes a unified control unit 1 electrically connected to the power module 2, and the unified control unit 1 has a core processor 3 inside. The signal input port 4 of the unified control unit 1 is communicatively connected with an input device 6 such as a keyboard or a mouse in the human-computer interaction interface 5, and the signal output port 7 of the unified control unit 1 communicates with the display output device 8 in the human-computer interaction interface 5 Connection, the state input port 9 of the unified control unit 1 is communicatively connected with the state output port 11 of the line signal conditioning module 10, the data input port 12 of the line signal conditioning module 10 is connected with the circuit breaker data output port 14, The coil data output port 16 of the arc suppression coil 15 and its line PT are connected to the zero sequence CT, the control port 17 of the unified control unit 1 and the command input port 19 of the command distribution module 18 are connected through the CAN bus 20, and the command distribution module The command output port 21 of 18 is in communication connection with the controlled port 22 of the arc suppression coil 15 . The core processor 3 includes calculating the grid capacitance current and the arc-suppression coil 15 needs to adjust gears, detecting line faults, selecting short-circuit lines and calculating the timing of switching damping resistance, and performing grid capacitance current and arc-suppression coil 15 needs. The method of calculating the shift position is to use the two-point method and the mountain-climbing method. The arc-suppression coil is pre-adjusted by calculating the capacitance current of the grid. The way to detect the line fault is to select the short-circuit line based on the rise of the neutral point voltage. The method is to calculate the active power of each line through the active component method and judge the grounding line. The line signal conditioning module 10 collects the working status of the section circuit breaker 13 and the arc suppression coil 15 and the electrical quantity of the line, including neutral point voltage and zero sequence current. . The unified control unit 1 sends the control command to the command distribution module 18 through the CAN bus, and coordinates and controls the arc suppression coil 15 and its damping resistance through signal conditioning and amplification.

The working principle of the present utility model is: at first through the keyboard or the mouse input device 6 in the human-computer interaction interface 5 combined with the operation interface of the display output device 8 to operate, start the unified control and line selection device to receive the line signal conditioning module 10 The state information of the section circuit breaker 13, the stall information of the arc suppressing coil 15 and the neutral point voltage and zero-sequence current information of the line, and send these information to the core processor 3 of the unified control unit 1, the core processing The unit 3 calculates the capacitance current of the power grid and the gear adjustment position of the arc suppression coil 15, detects line faults, selects the short circuit, and calculates the timing of switching the damping resistance. Processing, control the up/down gear of the arc suppressing coil 15 and the switching of the damping resistance through the output of the command, so as to achieve the effect of compensating the capacitive grounding current of the line.

Claims (3)

1. A unified control and line selection device for a distributed arc-suppression coil of a substation subsection busbar, comprising a unified control unit (1) electrically connected to a power module (2), characterized in that: a unified control unit (1) There is a core processor (3) inside, the signal input port (4) of the unified control unit (1) communicates with the input device (6) such as the keyboard or mouse in the human-computer interaction interface (5), and the unified control unit ( 1) The signal output port (7) is communicatively connected with the display output device (8) in the human-computer interaction interface (5), and the state input port (9) of the unified control unit (1) is connected with the line signal conditioning module (10) The state output port (11) is connected in communication, and the data input port (12) of the line signal conditioning module (10) is the same as the circuit breaker data output port (14) of the section circuit breaker (13) and the coil of the arc suppression coil (15) The data output port (16) and its line PT and zero-sequence CT are connected in communication, and the control port (17) of the unified control unit (1) and the command input port (19) of the command distribution module (18) pass through the CAN bus (20) The command output port (21) of the command distribution module (18) communicates with the controlled port (22) of the arc suppression coil (15). 2. The unified control and the line selection device of the distributed arc suppressing coil of substation subsection busbar according to claim 1, it is characterized in that: described line signal conditioning module (10) collects subsection circuit breaker (13), The working state of the arc suppressing coil (15) and the electrical quantity of the line include neutral point voltage and zero sequence current. 3. According to claim 1 or claim 2, the unified control and line selection device of the distributed arc-suppression coil of the substation sub-section busbar is characterized in that: the unified control unit (1) passes the control command through the CAN bus Send it to the instruction distribution module (18), and through signal conditioning and amplification, the arc suppression coil (15) and its damping resistance are coordinated and controlled. the

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