CN105487002A - Substation protection press plate position on-line monitoring system - Google Patents

Abstract

The invention discloses a substation protection press plate position on-line monitoring system which comprises an upper computer, intelligent press plate managers and intelligent press plates. The intelligent press plate managers collect information of the intelligent press plates, forward commands sent by the upper computer, carry out relay and data conversion on various parameters of the intelligent press plates, and send the processed data to the upper computer through an RS485 communication line. Position in-service/out-of-service states of the press plates are subjected to on-line monitoring by utilizing the non-electrical principle, and thus the problems of in-service/out-of-service leak and in-service/out-of-service misoperaiton of the press plates are solved, and a complete mis-locking-prevention scheme from primary equipment to secondary equipment is formed.

Description

On-line monitoring system for substation protection pressure plate position

technical field

The invention belongs to substation protection technology, and relates to an on-line monitoring system for the position of a substation protection pressure plate.

Background technique

The relay protection device is the nerve center of the power system, and the substation relay protection device is one of the most important equipment for the safe operation of the power system, providing protection for the safe operation of power equipment. In the power system, the opening and closing of the pressure plate on the relay protection screen determines the on-off of the circuit, which requires that the connection mode of the pressure plate should be accurate, otherwise serious consequences may occur. In the past, the inspection of the connection position of the pressure plate was done manually. One person read the position of a certain pressure plate, and the other compared it with the original library of the required pressure plate position to determine whether the actual position of the pressure plate is correct. If the connection is wrong, it should be rechecked and corrected. This method is not only time-consuming, but also a waste of manpower. In addition, due to the limitation of the space between the relay protection screens, the staff may touch the pressure plate screen and cause the relay on the screen to act, which will cause harm to people and circuits.

At present, there are many and complicated pressure plates for relay protection and automation devices in substations, and the pressure plates for each component and line protection range from dozens to hundreds of pieces. Especially in the switching operation, the correctness of the position of the pressure plate is directly related to the safe operation of the power grid, which is the key to the relay protection to protect the power grid equipment and correctly remove the faulty equipment. If the pressure plate is put into the wrong place, the relay protection device will not be able to operate correctly and effectively, which may cause damage to electrical equipment, casualties of personnel, and power accidents such as large-scale power outages, resulting in heavy losses.

Therefore, in the power system, the error of the relay protection device's pressure plate throwing and withdrawing is also one of the important reasons for the occurrence of power accidents. However, the current management methods for collecting information on the position and status of the pressure plate mainly rely on the corresponding management personnel to regularly inspect each substation, and then perform manual statistics and verification. This management method can barely meet the requirements in the case of the original small power scale. However, with the rapid expansion of the grid scale in recent years and the large increase in the number of substations, manual management methods have become less and less suitable for development needs, and the work efficiency is low, and errors are prone to occur and cause major losses.

Contents of the invention

In view of the deficiencies in the prior art, the purpose of the present invention is to provide an on-line monitoring system for the position of the substation protection pressure plate, so as to solve the problems of missing and wrong switching of the pressure plate.

To achieve the above object, the present invention takes the following technical solutions:

Substation protection pressure plate position online monitoring system, including upper computer, intelligent pressure plate manager and intelligent pressure plate; intelligent pressure plate is set on the pressure plate of each screen cabinet, and converts the change of position into corresponding power signal; intelligent pressure plate manager includes a microprocessor , the microprocessor is connected with a memory, and the microprocessor judges whether the pressure plate is in the casting position or the retreat position through the change of the power signal sent by the intelligent pressure plate; the intelligent pressure plate manager is used to collect the information of the intelligent pressure plate and forward it to the host computer. The commands sent by the intelligent pressure plate are relayed and data converted, and the processed data is sent to the host computer; the host computer is an industrial computer with operation, display functions and background control software. The remote field data is sent to the memory of the industrial computer, and the configuration software on the industrial computer processes the field real-time data.

Further, the platen signals from each panel are connected to the intelligent platen manager in a hand-in-hand manner.

Further, the microprocessor of the intelligent platen manager is also connected with a display module, the display module is an LED digital tube, and the LED digital tube is connected to the digital tube drive circuit and then connected to the microprocessor.

Further, the microprocessor of the intelligent platen manager is connected with an alarm output circuit, and the alarm output circuit is connected with the microprocessor after being connected with a relay.

Further, the intelligent platen manager sends the processed data to the upper computer through the RS485 communication line.

Further, the intelligent platen manager is provided with a manager panel, on which there are 4 display status LEDs, 3-digit LED digital tubes and 4 buttons, and the external connection terminals provided have dual RS485 bus interfaces and single M08 bus interfaces. .

The advantages of the present invention are:

The online monitoring system for the position of the substation protection pressure plate of the present invention includes a host computer, an intelligent pressure plate manager and an intelligent pressure plate; the intelligent pressure plate is arranged on the pressure plate of each screen cabinet, and the non-electrical principle is used to realize the online monitoring of the status of the pressure plate position, and Combined with the microcomputer anti-mistake locking system, it can display the real-time status of the pressing plate at the same time in the remote place and on the spot, and cooperate with the secondary operation anti-mistake expert system software of the host computer to form a complete secondary operation anti-mistake expert system. The present invention can realize advanced database application functions such as remote real-time query of the pressing plate position, historical data query, report generation, automatic pressing plate state checking, alarming, etc., and can realize the preview function of pressing plate throwing and withdrawing, realize logical preview on the PC, and download it to the pressing plate , to give a reminder on the pressure plate (for the pressure plate that needs to be switched on and off after the rehearsal is successful, the LED of the corresponding pressure plate will flicker), to avoid the wrong switch on and off of the pressure plate caused by human factors, thereby eliminating the hidden danger of safety accidents caused by the wrong switch on and off of the pressure plate, and achieving accident The previous scientific prevention has greatly improved the safety of power grid operation. The invention has the characteristics of high reliability, low primary investment cost, convenient use and maintenance, etc., and the realization methods include electromagnetic induction technology and photoelectric induction technology.

Description of drawings

Fig. 1: system structural diagram of the present invention;

Figure 2: Working principle diagram of the intelligent platen manager of the present invention;

Fig. 3: Panel diagram of the intelligent platen manager of the present invention;

Figure 4: Schematic diagram of the intelligent platen of the present invention;

Figure 5: Schematic diagram of the smart platen structure.

In the figure: 1-host computer; 2-intelligent pressure plate manager; 3-intelligent pressure plate.

detailed description

The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

As shown in Figure 1, the online monitoring system for the position of the substation protection pressure plate of the present invention includes a host computer 1, an intelligent pressure plate manager 2 and an intelligent pressure plate 3; Using non-electrical contact technology to convert the change of position into the corresponding electric power signal, the intelligent platen manager 2 is used to collect the information of the intelligent platen 3, forward the commands issued by the host computer 1, and perform various parameters of the intelligent platen 3 Succession, data conversion, and the processed data are sent to the upper computer 1;

The upper computer 1 is an industrial computer with operation and display functions and background control software, which is used to send remote field data into the memory of the industrial computer, and the configuration software on the industrial computer processes the real-time data on site.

The intelligent platen manager 2 includes a microprocessor, the microprocessor is connected with a memory, and the microprocessor judges whether the platen is in the cast position or the retreat position by changing the high and low levels of the power signal sent by the intelligent platen 3; the microprocessor is also connected There is a display module, the display module is an LED digital tube, and the LED digital tube is connected to the digital tube drive circuit and then connected to the microprocessor. The microprocessor is connected with an alarm output circuit, and the alarm output circuit is connected with the microprocessor after being connected with a relay.

The microprocessor judges whether the pressure plate is in the throwing position or the retreating position through the change of the high and low levels of the power signal. The intelligent pressure plate manager 2 and the intelligent pressure plate 3 are set on the ground floor, that is, the substation site. The intelligent pressure plate manager 2 collects the information of the intelligent pressure plate, forwards the commands issued by the upper computer, and relays and converts the various parameters of the intelligent pressure plate 3 , and send the processed data to the upper computer 1 through the RS485 communication line; the upper computer 1 is an industrial computer with operation, display functions and background control software, adopts the RS485 remote digital communication method, and firstly sends the remote field data timely and accurately Send it to the memory of the industrial computer, and then the configuration software on the industrial computer will process the real-time data on site. The pressure plate signals from each screen cabinet are connected to the intelligent pressure plate manager in a hand-in-hand manner. The intelligent pressure plate manager relays and converts the various parameters of the pressure plate, and sends the processed data to the host computer through the RS485 communication line. The host computer monitoring system is an independent and mature data relay and monitoring system.

The upper computer 1 adopts the RS485 remote digital communication method, first sends the remote field data to the memory of the industrial computer in a timely and accurate manner, and then processes the real-time data on site by the configuration software on the industrial computer.

The upper computer includes main technical parameters:

A. Hardware composition: Lenovo commercial host, independent graphics card, mouse, memory 1G, DVD drive, hard disk 300G, 24-inch widescreen LCD monitor.

B. Software composition: background monitoring software, after configuration, the software system realizes on-site data monitoring and query functions through clear screens; at the same time, through screen queries, you can check the working status and communication status of the on-site intelligent platen manager.

As shown in Figure 2 and Figure 3, Figure 2 is the working principle diagram of the intelligent platen manager. The CPU is respectively connected to the display module, memory, relay and digital tube driver, and is connected to the communication interface RS485 through the serial port, and is connected to a watchdog. The relay is connected to the alarm output circuit; Figure 3 is the panel diagram of the intelligent pressure plate manager, the intelligent pressure plate manager collects the information of the intelligent pressure plate, and forwards the commands issued by the host computer. There are 4 status LEDs, 3 digital tubes and 4 buttons on the panel. There are dual RS485 and single M08 buses for external terminals, and an alarm relay to realize alarm output (normally closed contact).

The display and operation of the intelligent platen manager are as follows:

A. Indicator light

M1: Indicates the state of the M08 bus. During normal operation, the status LED light M1 flashes slowly, indicating that the system is operating normally.

485I: Indicates the communication status of the 485 bus. The intelligent platen manager receives each byte of the host computer, and the 485I light flashes once (because the communication baud rate is 9600, the flicker may not be seen.)

485II: Indicates the communication status of the 485 bus. In the running state, if the correct call command from the host computer is received, the intelligent platen manager will send a response data, and the 485II light will flash once every time a byte is sent (due to the communication baud rate of 9600, the flicker may not be seen if it is relatively fast.)

Self-test: Indicates the system self-test, and lights up when the system is self-test.

B. 3-digit digital tube

During self-test: display the number of platen, sub-address of intelligent platen manager, error number, etc. During normal operation, it is off.

C. button

Selection key: When this key is pressed continuously, M1, 485I, 485II and TEST will be displayed cyclically, and the digital tube will display the supporting content at the same time, and different content can be selected and modified.

Increase key: Each time you press it, the displayed value will increase by 1; long press this key, the current displayed value will increase by 1 quickly.

Confirm key: After adjusting the parameters such as the number of platens and the sub-address of the intelligent platen manager, press this key, the digital tube will display "OK" and flash three times quickly, confirming that the settings are correct and the save is successful. If "FAL" is displayed, it means the save failed.

Self-inspection button: Press and hold the button for 3 seconds and release it to perform an automatic comprehensive self-inspection. When there is no key operation for 15 minutes, the digital tube goes out, the M1 status light flashes slowly, and it automatically enters the running state. If there is an error in the self-test, the digital tube will not go out, and the error code information will be displayed.

The setting of platen number and sub-address is as follows:

A. The setting of the number of pressure plates connected to the M08 bus

Press the select button until the M1 light is on, and the number of platens connected to the M08 bus is displayed. Press the increase or decrease key to set the total number of platens on the M1 bus. The value range of the number of platens is 1 to 60. After setting the number of M1 bus pressure plates, press the confirmation key, the digital tube will display "OK" and flash three times quickly, confirming that the setting is saved successfully.

B. Sub-address setting of RS-485 bus I

Press the select key until the 485I light is on, the digital tube displays the sub-address of the machine, press the increase key to modify the local address of the RS-485 bus I, and the value range is 1 to 127. After setting the sub-address, press the enter key to confirm, the digital tube displays "OK" and flashes three times quickly, confirming that the setting is saved successfully.

C. Sub-address setting of RS-485 bus II (reserved)

Press the select key until the 485II light is on, the digital tube displays the sub-address of the machine, press the increase key to set the local address of the RS-485 bus II, the value range is 1 to 127, after setting the sub-address, press the enter key, the digital The tube displays "OK" and flashes three times quickly, confirming that the settings are saved successfully.

Select until the TEST light is on, press and hold the self-test button for 3 seconds, and the system will perform a self-test.

The self-test process is as follows:

When the TEST light is on, press the confirmation key to perform a self-test. After the self-test is completed, the digital tube displays the self-test result: when the self-test is successful, it displays "OK" and flashes 3 times, and then displays the total number of platens counted by the self-test 5 After a few seconds, it will automatically exit the setting state, all the digital tubes will go out, and only the M1 light will flash slowly, and it will enter the running state.

When the self-test fails, it will display "FAL" and flash 3 times, and then display the total number of platens counted by the self-test. After the self-test is completed, the correct part of the self-test resumes operation. As for the wrong part, it should be continuously monitored, and "abnormal operation" will be displayed and the relay will give an alarm. Error information is sent to the host computer via RS485.

As shown in Fig. 4 and Fig. 5, Fig. 4 is a schematic diagram of the intelligent pressure plate, and Fig. 5 is a schematic diagram of the structure of the intelligent pressure plate. The actual rear view of the pressure plate is shown in the figure, which shows the position of the actual terminal. Table 2 is the definition of the terminal.

Terminal 1: the symbol is +24V, connected to the +24V power supply of the pressure plate;

Terminal 2: the symbol is GND, connected to the +24V power supply ground wire of the pressure plate;

Terminal 3: the symbol is M08Bs, connected to the M08 bus of the pressure plate;

Terminal 4: symbol GND, connected to the ground wire of the M08 bus on the pressure plate;

Terminal 5: symbol GND, connected to the M08 bus ground wire of the pressure plate;

Terminal 6: symbol M08Bus, connected to the pressure plate M08 bus;

Terminal 7: symbol GND, connected to the +24V power supply ground wire of the pressure plate;

Terminal 8: symbol +24V, connected to the +24V power supply of the pressure plate.

Claims (6)

1. The online monitoring system for the position of the substation protection pressure plate is characterized in that it includes a host computer (1), an intelligent pressure plate manager (2) and an intelligent pressure plate (3); The intelligent pressure plate (3) is set on the pressure plate of each screen cabinet, and converts the change of position into a corresponding power signal; The intelligent platen manager (2) includes a microprocessor, the microprocessor is connected with a memory, and the microprocessor judges whether the platen is in the cast position or the retracted position by changing the high and low levels of the power signal sent by the intelligent platen (3); The intelligent platen manager (2) is used to collect the information of the intelligent platen (3), forward the commands issued by the host computer (1), and relay and convert the various parameters of the intelligent platen (3), and process After the data is sent to the upper computer (1); The upper computer (1) is an industrial computer with operation and display functions and background control software, and is used to send remote field data into the memory of the industrial computer, and the configuration software on the industrial computer processes the real-time data on site. 2. The on-line monitoring system for substation protection pressure plate position according to claim 1, characterized in that: the pressure plate signals from each panel cabinet are connected to the intelligent pressure plate manager (2) in a hand-in-hand manner. 3. according to claim 1 or 2 described substation protection pressure plate position on-line monitoring system, it is characterized in that: the microprocessor of described intelligent pressure plate manager (2) is also connected with display module, and display module is LED digital tube, LED After the digital tube is connected with the digital tube drive circuit, it is connected to the microprocessor. 4. according to claim 1 or 2 described substation protection pressure plate position on-line monitoring system, it is characterized in that: the microprocessor of described intelligent pressure plate manager (2) is connected with alarm output circuit, after alarm output circuit is connected with relay and microcomputer Processor connection. 5. The on-line monitoring system for substation protection pressure plate position according to claim 1 or 2, characterized in that: the intelligent pressure plate manager (2) sends the processed data to the host computer (1) through the RS485 communication line. 6. The on-line monitoring system for the position of substation protection pressing plate according to claim 1 or 2, characterized in that: the intelligent pressing plate manager (2) is provided with a manager panel, on which there are 4 LEDs showing status, etc., 3 1-bit LED digital tube and 4 buttons, the external terminal set on the manager panel has dual RS485 bus interface and single M08 bus interface.