10KV power supply line automatic handle device and method

Abstract

The invention relates to the technical field of power supply equipment, and more specifically to an automatic handle device and method for a 10KV power supply line, which can realize non-stop transfer of 10kV loads under the premise of ensuring safety, improve the efficiency of loop closing operation and the reliability of power supply to users. The invention is characterized in that a host and two slaves are provided, wherein both the host and the slaves adopt a fully enclosed 6U 1 / 3 chassis, and are both provided with a main control board and an input module, an output module, a display, an AD module and a communication module respectively connected to the main control board, wherein current sampling data and voltage sampling data are sent to the main control board in analog form via the AD module, a main controller is provided in the main control board, and the output module is used to control the working state of a jump switch; the beneficial effect is that the non-stop transfer of loads can be realized quickly, the efficiency of loop closing operation is improved, the possibility of misoperation is reduced, and the reliability of power supply to users is improved.

Description

Technical field:

[0001] The present invention relates to the technical field of power supply equipment, and in particular to an automatic handle device and method for a 10KV power supply line, which realizes non-stop transfer of 10kV loads under the premise of ensuring safety, improves the efficiency of loop closing operation and the reliability of power supply to users. Background technology:

[0002] At present, there are two types of closing operations between different sections of the regional power grid. One is to use the "break before connect" method. This method requires a short power outage during operation, which reduces the continuity of power supply. The other is to adjust the distribution network of the previous voltage level so that the two lines to be closed are in the same bus section of the same substation. This method is complex to operate and prone to errors, and some distribution lines cannot be adjusted to the same bus. If the direct closing method is adopted, the power grid flow distribution during closing is greatly affected by the system operation. If the operation is improper, there may be risks such as equipment overload, relay protection malfunction, short-circuit current exceeding the standard, and accident expansion caused by the electromagnetic ring network due to excessive closing flow, which will affect the safety of the power grid. At present, the existing technology can complete the closing operation by adjusting the line protection setting so that the line to be closed does not act and the line to be unclosed acts. This method requires repeated adjustment of the line protection setting, which is very easy to make mistakes. In addition, most protection settings do not have the function of remote modification. The setting adjustment personnel need to change the setting of each protection on site, which increases the complexity of the operation. Summary of the invention:

[0003] In view of the shortcomings and deficiencies in the prior art, the present invention proposes a 10KV power supply line automatic handle device and method, which can calculate the closed-loop current after the handle is pulled through parameters such as line current, voltage, impedance, etc., and realize the functions of automatically closing the device handle switch and automatically disconnecting the line 1 or line 2 circuit breaker by verifying the maximum allowable current of the line, the line overcurrent protection setting, etc.

[0004] The present invention is achieved by the following measures:

[0005] A 10KV power supply line automatic handle device, characterized in that it is provided with 1 host and 2 slaves, wherein the host and the slave both adopt a fully enclosed 6U 1 / 3 chassis, and are both provided with a main control board and an input module, an output module, a display, an AD module, and a communication module respectively connected to the main control board, wherein current sampling data and voltage sampling data are sent to the main control board via the AD module in analog form, the main control board is provided with a main controller, and the output module is used to control the working state of the jump switch; data transmission is completed between the host and the slave via the communication module; the slave is installed in a substation, and the position and voltage signals of the 10kV line switch in the station are respectively collected through a current collection circuit and a voltage collection circuit, and are sent to the main control board after passing through the AD module, and a jump-close node is provided in the substation for tripping the line circuit breaker; the host is installed at the handle switch, and can collect signals such as the position, voltage amplitude, and phase of the handle switch, and has a jump-close node, which can close the handle circuit breaker; the line impedance on both sides needs to be input into the host, and the closing current is calculated in combination with the line voltage signal transmitted from the slave.

[0006] In the present invention, the front panel and back panel wiring of the master and slave are consistent. The front panel is equipped with a display screen, a total of 4 warning lights for operation, abnormality, mode 1, and mode 2, up, down, left, right, and confirmation buttons. The back panel wiring can be connected to a DC 220V power supply, a circuit breaker position input, and a tripping and closing node output. The master and slave machines are connected and communicated via an optical cable.

[0007] In the present invention, both the host and the slave are equipped with FC optical interfaces, and communication between the master and the slave can be performed through optical cables. The slave can transmit signals, measurements and other data collected in the station to the host, and the host can issue a trip command to the slave.

[0008] The present invention also proposes a 10KV power supply line automatic handle method, which is characterized by comprising the following steps:

[0009] Step 1: Before the host starts working, first select the closing operation mode 1 or mode 2 on the display screen according to the load transfer requirements. If mode 1 is selected, the operation mode is to close switch 3DL, open switch 1DL, and switch 2DL remains unchanged. Mode 1 lights up the indicator light. If mode 2 is selected, the operation mode is to close switch 3DL, open switch 2DL, and switch 1DL remains unchanged. Mode 2 lights up the indicator light.

[0010] Step 2: It is necessary to enter relevant set values ​​in the host display screen, including line overcurrent set value, line maximum allowable current and other electrical quantities, and transmit them to the main control board. The protection set value is consistent with the set value of stage III of the line protection device;

[0011] Step 3: The host is equipped with a closing handle. When the closing handle is turned, the host's input module receives the closing command. At this time, the host main control board calculates the closing current through the current and voltage signals transmitted by the slave and the line impedance and other constants input in the host constants, and compares the calculated closing current with the line overcurrent constant and the maximum allowable current of the line. When the closing current is greater than the line overcurrent constant or the maximum allowable current of the line, the display screen will prompt the closing operation to be locked. When the closing current is less than the line overcurrent constant and the maximum allowable current of the line, according to the set closing mode, the closing node in the host output module will be closed. At the same time, after the input module receives the handle switch position signal, it transmits the trip signal to slave 1 or 2 through the optical port of the communication module;

[0012] Step 4: After the communication module of the slave receives the tripping command from the host through the optical fiber, the tripping node of the output module will close and trip the circuit breaker of line 1 or line 2. The input module of the slave will collect the corresponding switch position and transmit the switch position to the host again through the optical port of the communication module. After confirming that the corresponding line switch has tripped, the host completes the loop closing operation. If the host does not receive the line breaker position signal within 10 seconds, it is determined that the line has failed to trip. At this time, the tripping node in the host output module is closed, the handle switch is disconnected, and the normal power supply mode is restored.

[0013] In step 4 of the present invention, before performing the loop closing operation, the host needs to complete the charging operation first. The charging conditions are 1DL and 2DL are in the closed position, and 3DL is in the open position. The charging is completed after the position is maintained for 10 seconds. When the switch position does not meet the charging requirements, the host discharges in real time to avoid misoperation of the loop closing.

[0014] The beneficial effect of the present invention is that it can quickly realize the transfer of loads without power outage. It improves the efficiency of loop closing operation and reduces the possibility of misoperation; it improves the reliability of power supply to users and optimizes the business environment; it can effectively prevent equipment damage and protection misoperation caused by loop closing operation, and improve power supply reliability. Description of the drawings:

[0015] Figure 1 It is a schematic diagram of the appearance structure of the host and the slave in the present invention.

[0016] Figure 2 This is a diagram of the master and slave backplane terminals involved in the present invention.

[0017] Figure 3 It is an internal structure diagram involved in the present invention.

[0018] Figure 4 It is a schematic diagram of the principles involved in the present invention.

[0019] Figure 5 It is a fixed value that needs to be input by the host involved in the present invention.

[0020] Figure markings: 1-housing, 2-indicator light, 3-display screen, 4-operation button, 5-AC current input, 6-AC voltage input, 7-debugging and communication network port, 8-device input signal, 9-device output signal, 10-master-slave communication optical port. Specific implementation method:

[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0022] Embodiment 1:

[0023] The master and slave of the 10kV line automatic handle device involved in this example have the same appearance, including a shell 1, which is in the shape of a hollow rectangular parallelepiped and is the size of a 6U 1 / 3 box. An indicator light 2, a display screen 3, and an operation button 4 are provided on the front surface of the shell 1. Under normal operation, the operation indicator light is on and emits green light. Under abnormal conditions, the abnormal indicator light is on and emits red light. The mode 1 and mode 2 indicator lights correspond to different modes set by the host and emit green light. Under normal operation, the display screen 3 can display the position of line 1, line 2 and the handle circuit breaker, and display the charging status of the device. Button 4 can cooperate with the display screen 3 to input a fixed value. The back panel of the box 1 is divided into 4 boards. Board 1 mainly inputs AC current 5 and AC voltage 6, of which the slave inputs the corresponding line interval AC quantity, and the host inputs the AC light of the handle switch. Board 2 is a communication board, and the device can be debugged through the network port 7, and communication between the master and slave can be realized through the optical port 10. The 3-position input card is connected to the 220V DC power supply, and the corresponding short circuit breaker position can be adopted. The corresponding handle mode can be put in and out by pressing the plate. The 4-position output card can realize the locking, alarm, tripping and closing signals of the device; it has a closing and adjusting node, which can realize the opening and closing operations of the circuit breaker. The internal structure logic of the present invention is as follows Figure 3 As shown, it includes a communication module, an input module, an output module, an AD conversion module, a display module, and a main control board module.

[0024] When in use, the slave is installed in the substation, collects the position, voltage and other signals of the 10kV line switch in the station, has a tripping and closing node, and can trip the line circuit breaker. The host is installed at the handle switch, can collect the position, voltage and other signals of the handle switch, has a tripping and closing node, and can close the handle circuit breaker; the master and slave are equipped with FC optical interfaces, and can communicate between the master and slave through optical cables. The slave can transmit the signals, measurements and other data collected in the station to the host, and the host can issue a tripping command to the slave; the host needs to input the line impedance on both sides, and calculate the closed loop current in combination with the line voltage and current signals transmitted by the slave.

[0025] Before closing the loop, the host needs to complete the charging operation first. The charging conditions are 1DL and 2DL closed, 3DL open, and the position is maintained for 10 seconds before charging is completed. When the switch position does not meet the charging requirements, the host will discharge in real time to avoid misoperation of closing the loop.

[0026] In this example, the host can set the closing mode 1 and mode 2. The action sequence of mode 1 is to close 3DL and disconnect 1DL, and the action sequence of mode 2 is to close 3DL and disconnect 2DL. There are mode 1 and mode 2 indicators on the front panel of the device, which light up according to the mode selected by the device.

[0027] When in use, the input modules of the master and slave machines collect the switch positions of the corresponding line intervals, and the AD module collects the analog current and voltage and converts them into digital quantities. The above data are transmitted to the main control board. The slave machine sends data to the host through the optical port of the communication module and stores it in the host main control board.

[0028] The host needs to be set up before it starts working. First, according to the load transfer requirements, select the closing operation mode 1 or mode 2 on the display screen. Figure 3 As shown, if you select mode 1, the operation mode is to close switch 3DL, open switch 1DL, and switch 2DL remains unchanged, and the indicator light is lit in mode 1. If you select mode 1, the operation mode is to close switch 3DL, open switch 2DL, and switch 1DL remains unchanged, and the indicator light is lit in mode 2. Secondly, you need to enter the relevant set values ​​in the host display screen. The specific set values ​​are as follows Figure 5 As shown, it includes the line overcurrent setting value, the line maximum allowable current and other electrical quantities, and transmits them to the main control board. The protection setting value is consistent with the setting value of the line protection device stage III.

[0029] The host is equipped with a closing handle. When the closing handle is turned, the host input module receives the closing command. At this time, the host main control board calculates the closing current through the current and voltage signals transmitted by the slave and the line impedance and other fixed values ​​input in the host setting. The calculated closing current is compared with the line overcurrent setting and the maximum allowable current of the line. When the closing current is greater than the line overcurrent setting or the maximum allowable current of the line, the display will prompt the closing operation to be locked. When the closing current is less than the line overcurrent setting and the maximum allowable current of the line, according to the set closing mode, the closing node in the host output module will be closed. At the same time, after the input module receives the handle switch position signal, the trip signal is transmitted to the slave 1 or 2 through the optical port of the communication module. After the communication module of the slave receives the host trip command through the optical fiber, the trip node of the output module will close and trip the circuit breaker of line 1 or line 2. At the same time, the input module of the slave will collect the corresponding switch position and transmit the switch position to the host again through the optical port of the communication module. After the host confirms that the corresponding line switch is tripped, the closing operation is completed. If the host does not receive the line circuit breaker trip signal within 10 seconds, it will be deemed that the line has failed to trip. At this time, the trip node in the host output module is closed, the handle switch is disconnected, and the normal power supply mode is restored.

[0030] The beneficial effect of the present invention is that it can quickly realize the transfer of loads without power outage. It improves the efficiency of loop closing operation and reduces the possibility of misoperation; it improves the reliability of power supply to users and optimizes the business environment; it can effectively prevent equipment damage and protection misoperation caused by loop closing operation, and improve power supply reliability.

Claims

1. An automatic handle method for an automatic handle device of a 10KV power supply line, characterized in that: The 10KV power supply line automatic handle device is provided with 1 host and 2 slaves, wherein the host and the slave are both in a fully enclosed 6U 1 / 3 chassis, and are both provided with a main control board and an input module, an output module, a display, an AD module, and a communication module respectively connected to the main control board, wherein the current sampling data and the voltage sampling data are sent to the main control board via the AD module in analog form, the main control board is provided with a main controller, and the output module is used to control the working state of the jump switch; the host and the slave complete data transmission via the communication module; the slave is installed in the substation, and the position and voltage signals of the 10kV line switch in the station are respectively collected through the current collection circuit and the voltage collection circuit, and are sent to the main control board after passing through the AD module, and the substation is provided with a jump-close node for tripping the line circuit breaker; the host is installed at the handle switch, and can collect signals such as the position, voltage amplitude, and phase of the handle switch, and has a jump-close node, which can close the handle circuit breaker; The host needs to input the line impedance on both sides, and combine it with the line voltage signal from the slave to calculate the closed-loop current; The automatic handle pulling method for the automatic handle pulling device of a 10KV power supply line comprises the following steps: Step 1: Before the host starts working, first select the closing operation mode 1 or mode 2 on the display screen according to the load transfer requirements. If mode 1 is selected, the operation mode is to close switch 3DL, open switch 1DL, and switch 2DL remains unchanged. Mode 1 lights up the indicator light. If mode 2 is selected, the operation mode is to close switch 3DL, open switch 2DL, and switch 1DL remains unchanged. Mode 2 lights up the indicator light. Step 2: It is necessary to enter relevant set values ​​in the host display screen, including line overcurrent set value, line maximum allowable current and other electrical quantities, and transmit them to the main control board. The protection set value is consistent with the set value of stage III of the line protection device; Step 3: The host is equipped with a closing handle. When the closing handle is turned, the host's input module receives the closing command. At this time, the host main control board calculates the closing current through the current and voltage signals transmitted by the slave and the line impedance and other constants input in the host constants, and compares the calculated closing current with the line overcurrent constant and the maximum allowable current of the line. When the closing current is greater than the line overcurrent constant or the maximum allowable current of the line, the display screen will prompt the closing operation to be locked. When the closing current is less than the line overcurrent constant and the maximum allowable current of the line, according to the set closing mode, the closing node in the host output module will be closed. At the same time, after the input module receives the handle switch position signal, it transmits the trip signal to slave 1 or 2 through the optical port of the communication module; Step 4: After the communication module of the slave receives the tripping command from the host through the optical fiber, the tripping node of the output module will close and trip the circuit breaker of line 1 or line 2. The input module of the slave will collect the corresponding switch position and transmit the switch position to the host again through the optical port of the communication module. After confirming that the corresponding line switch has tripped, the host completes the loop closing operation. If the host does not receive the line breaker position signal within 10 seconds, it is determined that the line has failed to trip. At this time, the tripping node in the host output module is closed, the handle switch is disconnected, and the normal power supply mode is restored; In step 4, before performing the loop closing operation, the host must first complete the charging operation. The charging conditions are 1DL and 2DL closed, 3DL open, and the position is maintained for 10 seconds before charging is completed. When the switch position does not meet the charging requirements, the host discharges in real time to avoid misoperation of the loop closing.

2. The automatic handle pulling method for the automatic handle pulling device of a 10KV power supply line according to claim 1, characterized in that: The front panel and back panel wiring of the master and slave are consistent. The front panel is equipped with a display screen, 4 alarm lights for operation, abnormality, mode 1 and mode 2, up, down, left, right and confirmation buttons. The back panel wiring can be connected to a DC 220V power supply, a circuit breaker position input, and a tripping and closing node output. The master and slave machines are connected and communicated via optical cables.

3. The automatic handle pulling method for the automatic handle pulling device of a 10KV power supply line according to claim 1, characterized in that: Both the master and slave are equipped with FC optical interfaces, and communication between the master and slave can be carried out through optical cables. The slave can transmit the signals, measurements and other data collected in the station to the master, and the master can issue tripping commands to the slave.

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