CN203761138U - Device for preventing maloperation in remote control of substation automatic measurement and control equipment - Google Patents

Abstract

A device for preventing incorrect remote control of substation automation measurement and control equipment, which is characterized in that it consists of a single-chip microcomputer, a remote control DC detection circuit, a closed relay detection circuit, a closed relay detection circuit, a remote control locking relay drive circuit, and a substation automation system. The long-closed contact point of the blocking relay introduced in the remote control circuit of the measurement and control device can prevent the remote automatic control system (such as AVC, etc.) When the situation occurs, it can receive the blocking command sent by the communication gateway of the substation and cut off the specific remote control circuit, and transmit the detection information of the remote control circuit and the operation status information of the device body to the local microcomputer monitoring system and dispatching master station of the substation, and can also receive and execute The remote input and withdrawal command issued by the communication gateway of the substation. Its structure is simple and its work is reliable.

Description

A device for preventing remote control mis-exit of substation automation measurement and control equipment

technical field

The utility model relates to a protection device for a substation measurement and control system, in particular to a device for preventing the remote control of substation automation measurement and control equipment from being mistakenly exported.

Background technique

In the power system, vicious accidents such as equipment damage at the substation end caused by remote control operations, and ground knife and switch switch often occur. At present, there is no anti-misoperation locking device in the remote control circuit adopted by the substation automation measurement and control device, so it cannot be guaranteed that the automatic reactive power voltage adjustment system (AVC) at the master station will not cause capacitors to be repeatedly switched in a short period of time due to incorrect parameter settings. Misoperation accidents such as burnout, busbar grounding caused by the ground knife closing the knife switch, causing a power outage in the whole station, pulling and closing the knife switch with load causing damage to the knife switch equipment, opening and closing the circuit breaker when the protection is abnormal, causing the equipment to operate with faults, etc. Misoperation accidents.

Contents of the invention

The purpose of the utility model is to overcome the deficiencies of the prior art, and provide a device with reliable operation and simple structure, which can be applied to the substation automation measurement and control device to prevent the remote control of the substation automation measurement and control equipment from misexiting.

The purpose of this utility model is achieved in this way: a device for preventing substation automation measurement and control equipment from being exported by remote control, which is characterized in that it consists of a single-chip microcomputer, a remote control DC detection circuit, a closing detection circuit of a closed relay, and an opening detection circuit of a closed relay , the remote control locking relay drive circuit, the long closed contact point of the locking relay introduced in the remote control circuit of the substation automation measurement and control device, the remote control DC detection circuit composed of resistors, LEDs, and light-isolated connections is connected to the IO4 port of the microcontroller; The closed relay closing detection circuit composed of diode, optical barrier, and closed relay action coil contact connection is connected to the IO1 port of the single-chip microcomputer; the closed relay is composed of resistance, Zener diode, optical spacer, and closed relay return coil contact connection. The opening detection circuit is connected to the IO2 port of the single-chip microcomputer; the remote-control locking relay driving circuit composed of an optical barrier, a resistor, and a locking relay is connected to the IO3 port of the single-chip microcomputer, and the long-closed contact point of the locking relay is connected in series to the remote control circuit of the measurement and control device.

The VCC and Gnd ports of the single-chip microcomputer are connected with a voltage stabilizing circuit module, the RX1 and TX1 ports are connected with a serial port communication circuit composed of a serial port optical isolation circuit, and the other end of the serial port communication circuit is connected with a terminal server.

The single-chip microcomputer collects the action conditions of the relay action coil and reset coil through the IO port, collects and controls the input and charging status of the DC circuit breaker, and controls the remote control locking relay. Communicate with the substation gateway through the serial port, send the detection information of the control circuit and the device itself to the remote dispatching master station and the local substation monitoring system, and receive the blocking information from the local substation monitoring system, such as: grounding wire or grounding switch. , Protection of abnormal blocking circuit breaker operation, multiple tripping circuit breakers in a short period of time to block the operation of the circuit breaker, etc. One single-chip microcomputer can control multiple remote control loops in one interval, for example, a line interval with 1/2 wiring has a total of 4 control loops with 1 circuit breaker and 3 knife switches.

The utility model judges and prevents remote automatic control systems (such as AVC, etc.) Operation of one circuit breaker or remote adjustment of one main transformer on-load tap-changer occurs; the remote control loop on the automatic measurement and control device is cut off by receiving the blocking command sent by the communication gateway of the substation; The system and the dispatching master station transmit the detection information of the remote control circuit and the operating status of the device body to realize the remote monitoring and alarm function of the remote control circuit, and can receive and execute the remote input and withdrawal commands issued by the communication gateway of the substation. The remote control circuit is normal when the device exits use. It also has the characteristics of simple structure and principle and reliable operation.

Description of drawings

Fig. 1 is a schematic circuit diagram of the utility model;

Fig. 2 is a schematic diagram of a remote control circuit for the utility model to be connected to an existing substation automation measurement and control device.

Detailed ways

Below in conjunction with the accompanying drawings the utility model is further described: as shown in Figure 1, the present embodiment takes the realization of the locking function of one remote control circuit as an example.

The microcontroller IC1 collects the action of the closed relay KKJ action coil DZ through the IO1 port, collects the action of the closed relay KKJ return coil FG through the IO2 port, collects the input and charging status of the remote DC circuit breaker through IO4, and controls the remote control lockout through IO3 The relay BSJ uses the serial port to communicate with the substation gateway, sends the detection information of the remote control circuit and the device itself to the local monitoring system of the substation and the remote dispatching master station, and receives the blocking information from the local monitoring system of the substation.

The remote control DC detection circuit is composed of resistor R1, resistor R2, light-emitting diode LED1, voltage regulator diode D3, and optical isolation OC4 connected between the output terminals of the two poles of the DC circuit breaker SK. R1 and R2 are used for current limiting, and LED1 is used for external remote control. When the DC circuit breaker is switched on and charged, OC4 outputs the status to the IO4 port of the microcontroller for collection, and D3 is used to prevent overvoltage and protect OC4.

The voltage stabilizing circuit module IC2 is powered by 220V UPS in the substation, providing 0V ground potential, +5V power supply voltage output, and +24V power supply voltage output for the device, of which +5V power supply is used for single-chip microcomputer and the circuit power supply electrically connected with the single-chip microcomputer. The +24V power supply is used for the power supply of the remote control locking relay drive circuit and other external circuits.

The closing detection circuit of the closing relay is composed of resistor R3, resistor R6, optical barrier OC1, Zener diode D1, and contact point KKJ-DZ of the operating coil of the closing relay. R3 and R6 act as current limiters, and D1 is used to protect against overvoltage OC1, when the closing remote control command is executed, the contact KKJ-DZ of the action coil of the relay is closed after closing, the optical isolation OC1 is turned on, and the remote closing signal is transmitted to the single-chip microcomputer.

The opening detection circuit of the closed relay is composed of resistor R4, resistor R7, Zener diode D2, optical barrier OC2, and the contact point KKJ-FG of the closed relay reset coil. R4 and R7 act as current limiters, and D2 is used to prevent overvoltage and OC2, when the opening remote control command is executed, the relay reset coil contact KKJ-FG is closed after closing, the optical isolation OC2 is turned on, and the remote control opening signal is transmitted to the single-chip microcomputer.

The remote control locking relay driving circuit is composed of resistor R5, resistor R8, optical barrier OC3, and locking relay BSJ. The long closed contact point BSJ1 of the locking relay is connected in series to the remote control circuit of the measurement and control device (see Figure 2). The single-chip computer outputs high power through the IO3 port. Normally, the optical isolation OC3 is turned on, the blocking relay BSJ is excited, and the long-closed contact of BSJ1 is opened, thereby disconnecting the power supply of the remote control circuit.

The serial port communication circuit is composed of serial port optical isolation circuit IC3, one end of IC3 is connected to the serial port RX1 and TX1 of the single-chip microcomputer, and the other end is connected to the terminal server, which plays the role of electrical signal isolation.

Through the terminal server, the substation communication gateway can communicate with multiple devices of the utility model, and the substation communication gateway also communicates with the local monitoring system of the substation and the remote dispatching master station.

The working process of the utility model is that the single-chip microcomputer collects through the closing detection circuit of the closed relay and the opening detection circuit of the closed relay and judges whether the closing and opening times of the remote control circuit exceed the limit value within a period of time, and if so, it is driven by the remote control locking relay The circuit opens BSJ1 to disconnect the remote control circuit, so as to avoid the situation that the remote automatic control system (such as AVC, etc.) repeatedly remotely controls a circuit breaker or remotely adjusts a main transformer on-load tap-changer in a short period of time. The single-chip microcomputer can disconnect the specific remote control circuit through the remote control locking relay drive circuit according to the blocking command sent by the substation communication gateway. The single-chip microcomputer transmits the detection information of multiple remote control circuits in one interval of the automatic measurement and control device and the operating status information of the device body to the local microcomputer monitoring system of the substation and the dispatching master station through the serial port optical isolation circuit to realize the remote monitoring and alarm function of the remote control circuit. The single-chip microcomputer can also execute the remote input and withdrawal commands issued by the dispatching master station through the substation communication gateway, and the BSJ1 remains closed when the device exits.

The utility model can be installed on the screen surface of the automatic measurement and control device, which is convenient for secondary circuit wiring.

As shown in Figure 2, the utility model adds a long-closed node BSJ1 of a locking relay to the remote control circuit of the automatic measurement and control device. When the locking relay operates, the BSJ1 contact is disconnected, and the remote control circuit is disconnected immediately, thereby realizing the remote control of the locking the purpose of the operation.

Claims (2)

1. A device for preventing substation automation measurement and control equipment remote control from mistakenly exiting is characterized in that it consists of a single-chip microcomputer, a remote control DC detection circuit, a closing relay closing detection circuit, a closing detection circuit of a relay, a remote control locking relay drive circuit, and The long closed contact point of the locking relay introduced in the remote control circuit of the substation automation measurement and control device is composed of a remote control DC detection circuit composed of resistors, LEDs, and optical barriers connected to the IO4 port of the single-chip computer; The closed relay closing detection circuit formed by the action coil contact connection is connected to the IO1 port of the single chip microcomputer; IO2 port; the remote control locking relay drive circuit composed of light barrier, resistance and locking relay connection is connected to the IO3 port of the single chip microcomputer, and the long closed contact point of the locking relay is connected in series to the remote control circuit of the measurement and control device. 2. A device for preventing substation automation measurement and control equipment from being exported by mistake according to claim 1, characterized in that the VCC and Gnd ports of the single-chip microcomputer are connected with a voltage stabilizing circuit module, and the RX1 and TX1 ports are connected with a serial port optical isolation module. A serial port communication circuit formed by the circuit, the other end of the serial port communication circuit is connected with the terminal server.