CN201130821Y - Intelligent control device for the electrical system used - Google Patents

Abstract

The utility model relates to an intelligent control device for the electric system used, which comprises an intelligent controller, the intelligent controller has a plurality of input ports and a plurality of output ports, and the input ports include an input port for abnormal incoming line voltage, a Ground/remote operation input port, circuit breaker tripping state input port, circuit breaker closing and opening state input port, the output ports include output for controlling the closing and opening commands of the incoming line circuit breaker and bus tie circuit breaker respectively The intelligent controller judges the input signal through the input port of abnormal incoming line voltage and the input signal of the circuit breaker closing and opening status input port, and outputs the control signal to the incoming line circuit breaker and bus tie disconnection according to the operation mode required by the system The output port of the closing and opening commands of the switch is used to perform backup and automatic switching control to achieve continuous power supply, to ensure continuous power supply of the electrical system used, and to make the operation of the electrical system more reliable and intelligent.

Description

Intelligent control device for the electrical system used

technical field

The utility model relates to an electrical system used in a substation, in particular to an intelligent control device for the electrical system used in a substation with a voltage level of 110kV or below.

Background technique

At present, the electrical system used in the substation uses two incoming line power supplies to supply power to the feeder circuit. The two incoming line power supplies are respectively electrically connected to the incoming line circuit breakers, the busbars electrically connected to each incoming line circuit breaker, and the two sections of busbars are electrically connected to each other. There are bus tie circuit breakers, and each circuit breaker has three working positions: opening, closing, and tripping. The system has multiple operating modes, one of which is that the two incoming line power sources are the main power supply, and the incoming line is open. The breakers are all in the closing position, the bus tie circuit breaker is in the opening position, and the main power supply supplies power to the corresponding busbars respectively; one operation mode is that one of the two incoming power supplies is the main power supply, and the other incoming power supply The incoming circuit breaker corresponding to the main power supply is in the closing position, the incoming circuit breaker corresponding to the standby power is in the opening position, and the bus tie circuit breaker is in the closing position, and the main power supply is in the two-section busbar Power supply at the same time. In the prior art, manual switching of each circuit breaker is mainly used to make the system operate in different operating modes. However, this manual mode cannot meet the requirements of unattended operation. The line power supply is the main power supply operation mode. When one line of incoming power fails, the section of the bus will lose power, and the operating personnel must rush to the scene to deal with it in time to minimize the loss.

The importance of the electrical system used in the substation is obvious. If the entire substation loses power, it will cause emergency situations such as overheating of the main transformer and discharge of the battery of the DC system. If it is not dealt with in time, it will cause more serious consequences. , so it is required that the electrical system used can guarantee continuous and reliable power supply.

Contents of the invention

The purpose of the utility model is to overcome the deficiencies of the prior art and provide an intelligent control device for the electric system that is suitable for unattended and reliable continuous power supply.

In order to achieve the above purpose, the technical solution adopted by the utility model is: an intelligent control device for the electrical system used, the electrical system used includes two incoming line power supplies, which are respectively connected to the two incoming line power supplies. The incoming line circuit breaker electrically connected, the bus bar electrically connected with the two-way incoming line power supply respectively, the bus tie circuit breaker is electrically connected between the two sections of bus bars, and each of the circuit breakers has opening, closing There are three working positions of brake and tripping. The system has two operation modes. The first operation mode is that the two incoming line power sources are the main power supply, and the incoming line circuit breakers are all in the closing position. The circuit breaker is in the opening position, and the main power supply supplies power to the corresponding bus bars; the second operation mode is that one of the two incoming power supplies is the main power supply, and the other incoming power supply is Standby power supply, the incoming line circuit breaker corresponding to the main power supply is in the closing position, the incoming line circuit breaker corresponding to the standby power supply is in the opening position, and the bus tie circuit breaker is in the closing position, the main power supply to the two Segment buses supply power at the same time, characterized in that: the intelligent control device includes an intelligent controller, the intelligent controller has a plurality of input ports and a plurality of output ports, and the input ports include an input port for abnormal incoming line voltage, an on-site /Remote operation input port, circuit breaker tripping state input port, circuit breaker opening and closing state input port, the output ports include output for controlling the closing and opening of the incoming line circuit breaker and bus tie circuit breaker respectively The output port of the gate command, the intelligent controller judges according to the signal input from the abnormal input port of the incoming line voltage and the signal of the input port of the circuit breaker closing and opening state, and outputs the control signal to the incoming line circuit breaker according to the operation mode required by the system And the output port of the closing and opening commands of the bus tie circuit breaker to perform standby automatic switching control to achieve continuous power supply.

Due to the application of the above-mentioned technical scheme, the utility model has the following advantages compared with the prior art: the intelligent controller judges the signal input by the input port of the abnormal incoming line voltage and the input signal of the circuit breaker closing and opening state input port and follows the system The required operation mode outputs the control signal to the output port of the incoming line circuit breaker and the bus tie circuit breaker closing and opening commands to perform backup and automatic switching control to achieve continuous power supply, to ensure that the power system used can continue to supply power, so that the power used The system operation is more reliable and intelligent.

Description of drawings

Accompanying drawing 1 is a schematic diagram of the block structure of the electrical system used by the utility model;

Accompanying drawing 2 is the utility model intelligent controller circuit schematic diagram;

Among them: 1. Incoming power supply; 2. Incoming circuit breaker; 3. Bus bar; 4. Bus tie circuit breaker; 5. Intelligent controller; 8. Incoming line detection unit.

Detailed ways

Below in conjunction with accompanying drawing, illustrate in detail the specific content of the present utility model:

The electrical system used as shown in Figure 1 includes two incoming line power sources 1, incoming line circuit breakers 2 electrically connected to the two incoming line power sources 1, and busbars 3 electrically connected to each incoming line circuit breaker 2 , a bus-tie circuit breaker 4 is also connected between the two sections of busbar 3. In order to facilitate maintenance and replacement, each circuit breaker adopts a draw-out type circuit breaker, and the overcurrent protection value of each circuit breaker can be adjusted. Each circuit breaker has an opening , closing, and short-circuit tripping three working positions, so the system can operate in the following two modes: the first mode of operation is that the two incoming line power sources 1 are used as the main power supply, and the two incoming line circuit breakers 2 are in the closed state. The bus tie circuit breaker 4 is in the opening position, that is, in this operation mode, two incoming power sources 1 are used to supply power to the two busbars 3 respectively; the second operating mode is that one of the incoming power sources 1 is used as the main power supply, Another incoming line power supply 1 is used as a backup power supply, the incoming line circuit breaker 2 connected to the main power supply is in the closing position, the incoming line circuit breaker connected to the backup power supply is in the opening position, and the bus tie circuit breaker is in the closing position , that is to say, in this mode of operation, power is supplied to the two busbars at the same time through one main incoming line power supply.

Along with the higher and higher requirements of intelligence, the electrical system used in the utility model also includes two incoming line detection units 8 and an intelligent controller 5. Phase electrical connection, the output end of each incoming line detection unit 8 is electrically connected with the intelligent controller 5 respectively, each bus detection unit 6 is connected with the bus 3 of the corresponding section, and the output end of the bus detection unit 6 is also connected with the intelligent controller 5 is also connected.

What Fig. 2 shows is the electric schematic diagram of the intelligent controller 5 of the present invention, and this controller is made up of multi-chip logic controllers, and in this embodiment, adopts four logic controllers, and the logic controller selects Siemens LOGO! series. The intelligent controller 5 has multiple input ports and multiple output ports, and the input ports include two input ports for abnormal incoming line voltage, local/remote operation input ports, input ports for tripping state of incoming line circuit breaker and bus tie circuit breaker, Circuit breaker closing and opening state input ports, output ports include incoming line circuit breaker and bus tie circuit breaker closing command output port, incoming line circuit breaker and bus tie circuit breaker opening command output port, abnormal alarm output port, etc., intelligent control According to the requirements of the system on the operation mode and the input signal, the device performs backup and automatic switching control on the system, so as to ensure the continuous power supply of the electrical system used.

The following specifically introduces several modes of automatic switching control of the utility model intelligent controller 5:

The first standby automatic switching mode is that the system is in the first operating mode, that is, the two incoming line power sources are the main power supply, the bus tie circuit breaker is in the opening position, the two incoming line circuit breakers are in the closing position, and each incoming line The detection unit 4 judges the overvoltage, undervoltage and phase loss of the incoming power supply according to the preset overvoltage and undervoltage points, and outputs a signal indicating whether the corresponding incoming power supply is abnormal to the intelligent controller. The undervoltage set point is adjustable. When the intelligent controller 5 detects that any incoming power supply is abnormal, it controls the incoming circuit breaker connected to the incoming power supply to disconnect and closes the bus tie circuit breaker. When the corresponding Troubleshooting the incoming power supply, the intelligent controller disconnects the bus tie circuit breaker, closes the corresponding incoming power supply, and restores the mode of two incoming power supplies as the main power supply;

The second standby automatic switching mode is that the system is in the second operating mode, that is, at this time, one of the incoming power sources is the main power supply, the other incoming power source is the backup power source, and the bus tie circuit breaker between the busbars is in the closing position. Each incoming line detection unit 4 judges whether the incoming line power is overvoltage, undervoltage, or lack of phase according to the preset overvoltage and undervoltage points, and outputs a signal indicating whether the corresponding incoming line power is abnormal to the intelligent controller. The above-mentioned overvoltage and undervoltage set points are adjustable. When the intelligent controller 5 detects that the main power supply is abnormal and the standby power supply is normal, the intelligent controller will disconnect the incoming circuit breaker connected to the main The incoming line circuit breaker connected to the power supply is closed. When the main power supply fails to discharge, the intelligent controller controls the incoming line circuit breaker connected to the backup power supply to automatically disconnect, and the incoming line circuit breaker connected to the main power supply is automatically disconnected. closed, thereby returning to the original mode of operation.

The closing and opening control of the above-mentioned circuit breaker is mainly automatically controlled by the intelligent controller. Of course, the switching control of the circuit breaker in this embodiment can also be carried out manually, especially in the event of an electrical failure or the failure of both AC incoming lines. In case of power failure, emergency operation can be performed manually.

When an AC accident trip occurs, the intelligent controller controls the corresponding circuit breaker to be in a locked state, thereby preventing the further expansion of the AC fault and causing the AC power loss of the entire station. The specific operations are as follows:

When the system is in the first mode of operation, the intelligent controller detects that a certain incoming circuit breaker has short-circuit tripping, the system will maintain the original state, maintain the state of single-bus operation, and prohibit the bus-tie circuit breaker from automatically switching on to prevent the fault point from causing Another incoming circuit breaker trips, thereby avoiding the occurrence of AC power loss in the whole station. After repairing the fault point, the maintenance personnel switch the system to the manual operation mode and open the tripped circuit breaker, and the system returns to the normal state, and then switch the system to the corresponding automatic operation according to the needs of the on-site operation. Way;

When the system is in the second operation mode, if the intelligent controller detects that the bus tie circuit breaker has tripped, the system will maintain the original state, maintain the state of single bus operation, prohibit the input of the backup power supply, and prevent the fault point from causing the backup power supply to enter the circuit breaker. Tripping, so as to avoid the occurrence of AC power loss in the whole station. If the intelligent controller detects that the incoming line circuit breaker connected to the main power supply trips, it will first open the bus tie circuit breaker, and then close the incoming line circuit breaker connected to the backup power supply, so as to avoid The AC power failure of the whole station occurs. After repairing the fault point, the maintenance personnel switch the system to the manual operation mode and open the tripped circuit breaker, and the system returns to normal state, and then switch the system to the corresponding automatic operation mode according to the needs of on-site operation Operation mode.

Claims (4)

1. An intelligent control device for the electrical system used, the electrical system used includes two incoming line power supplies, incoming circuit breakers electrically connected to the two incoming line power supplies, The two-way incoming power supply is electrically connected to the busbar, and the bus tie circuit breaker is electrically connected between the two sections of the busbar. Each of the circuit breakers has three working positions: opening, closing, and tripping. The system has Two operation modes, the first operation mode is that the two incoming line power sources are the main power supply, the incoming line circuit breakers are in the closing position, the bus tie circuit breaker is in the opening position, and the main The power supply supplies power to the corresponding bus bars; the second operation mode is that one of the two incoming power supplies is the main power supply, and the other incoming power supply is the backup power supply, and the incoming line corresponding to the main power supply is disconnected. The breaker is in the closing position, the incoming circuit breaker corresponding to the backup power supply is in the opening position, and the bus tie circuit breaker is in the closing position, and the main power supply supplies power to the two busbars at the same time. It is characterized in that: the intelligent control The device includes an intelligent controller, and the intelligent controller has multiple input ports and multiple output ports, and the input ports include an input port for abnormal incoming line voltage, an input port for local/remote operation, and an input port for circuit breaker tripping status. port, circuit breaker opening and closing status input port, the output ports include output ports for controlling the closing and opening commands of the incoming line circuit breaker and bus tie circuit breaker respectively, and the intelligent controller Judgment is made according to the signal input from the input port of the abnormal input voltage of the incoming line and the signal of the input port of the closing and opening state of the circuit breaker, and output control signals to the closing and opening commands of the incoming line circuit breaker and bus tie circuit breaker according to the operation mode required by the system The output port is used for backup and automatic switching control to achieve continuous power supply. 2. The intelligent control device for the power system according to claim 1, characterized in that: the intelligent controller also has an abnormal alarm output port for alarm prompting. 3. The intelligent control device for the electric system according to claim 1 or 2, characterized in that the intelligent controller is a logic controller. 4. The intelligent control device for the electric system according to claim 3, characterized in that: said intelligent controller adopts LOGO! series controller.

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