A method for transforming the process layer switch in a string of two-thirds wiring intelligent substation

Abstract

A method for upgrading intra-string process layer switches in a two-three-way connected intelligent substation involves shutting down incoming lines before outgoing lines, or vice versa, during the upgrade of a single-string process layer switch. This power outage sequence is followed to migrate the network interfaces of the corresponding secondary equipment within the outage interval from the old switch to the new switch, ultimately completing the upgrade of the single-string process layer switch. This ensures that the entire string is not shut down during the upgrade process. By optimizing the power outage method for incoming and outgoing switch intervals during the upgrade of single-string process layer switches, the scope of the outage is reduced, and the operating time of the incoming and outgoing lines within the upgraded interval is increased, significantly improving the power generation and supply efficiency and operational reliability of the power system.

Description

Technical Field

[0001] The present invention relates to the technical field of power switches, and in particular to a method for transforming a process layer switch in a string of a two-thirds wiring intelligent substation. Background Art

[0002] Smart substations are usually equipped with process layer switches, which are the core switching devices connecting the secondary devices of the substation. As an intermediate device for information transmission of secondary devices such as protection, measurement and control, and smart terminals, it plays an important role in data communication and control signal transmission.

[0003] Before the intelligent substation process layer switch equipment is shut down for transformation, the corresponding protection device should be stopped, and the primary equipment in the corresponding interval cannot operate without protection, so it must also be stopped. After the process layer switch transformation is completed, the protection equipment and primary equipment in the corresponding interval can be put into operation.

[0004] For a typical two-thirds wiring smart substation in the power grid, process layer switches are usually configured in series. Because the number of protection, measurement and control, and smart terminals in the entire series is large, one switch port cannot meet the needs, so two switches are usually configured for cascade access. If any of the two process layer switches stops operating, it will affect the operation of the secondary equipment in the series. Figure 1 As shown, when only the incoming line and 1DL, 2DL or the outgoing line and 2DL, 3DL are shut down, both process layer switches still have data to transmit. Therefore, when the process layer switch reaches the service life and needs to be modified, it is often arranged to coordinate the power outage of the entire string of 1DL, 2DL, 3DL, incoming lines and outgoing lines.

[0005] Attached Figure 1 As shown in the figure, it is a schematic diagram of a single string interval of a smart substation with two-thirds wiring (actually more than one string). In the smart substation with two-thirds wiring, there are three switches 1DL, 2DL, and 3DL between the two busbars I and II. There are two isolation switches on both sides of the three switches, which are 5011, 5012, 5021, 5022, 5031, and 5032 from I to II. Incoming line 1 is connected between switches 5012 and 5021, and outgoing line 1 is connected between switches 5022 and 5031. Current transformers are arranged on both sides of the three switches 1DL, 2DL, and 3DL, which are 11LH, 12LH, 21LH, 22LH, 31LH, and 32LH from I to II. Switch 16 is an incoming line isolation switch, and switch 36 is an outgoing line isolation switch. The secondary circuits of the three switches and the current transformer are connected to the secondary devices in the corresponding intervals through secondary cables, and the secondary devices are connected to the process layer switch through optical fibers.

[0006] Use existing technology to transform the process layer switch in the string of two-thirds wiring intelligent substation to attach Figure 1 To explain:

[0007] Initial state: The initial state is the normal operation state. Figure 1 All switches and isolators are in the closed state, incoming line 1 sends load to the system, and outgoing line 1 sends load to the line.

[0008] Step 1: Shut down incoming line 1, open 1DL, 5011, 5012 in sequence, then open 2DL, 5021, 5022, and switch 1DL and 2DL to power outage and maintenance status.

[0009] Step 2: Shut down outgoing line 1, disconnect 3DL, 5031, and 5032 in sequence, and switch 3DL to power-off maintenance state.

[0010] Step 3: Complete the transformation of the two process layer switches A1 and A2.

[0011] Step 4: Put the incoming line 1 and the outgoing line 1 into operation to supply power.

[0012] It takes 3 days to remodel two process layer switches at the same time, so both incoming line 1 and outgoing line 1 need to be shut down for 3 days. The power outage sequence of this method is shown in the table below.

[0013] Table 1 Power outage schedule for the current transformation method

[0014] Summary of the invention

[0015] The technical problem to be solved by the present invention is to provide a method for transforming a process layer switch in a string of a two-thirds wiring intelligent substation, which can avoid power outage of the entire string during the transformation process.

[0016] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0017] A method for transforming a process layer switch in a string of a two-thirds wiring intelligent substation. During the transformation process:

[0018] S1. First, use the new switch A3 to cascade with the original switch A1, then keep the circuit breaker 1DL at the incoming line end or the circuit breaker 3DL at the outgoing line end running, disconnect other circuit breakers and the isolation switches at both ends, and reconnect the secondary equipment corresponding to the out-of-service circuit breakers from switches A1 and A2 to A3;

[0019] S2. If the incoming circuit breaker 1DL remains in operation, the outgoing circuit breaker 3DL is put into operation, and 2DL remains in the power-off maintenance state;

[0020] If the circuit breaker 3DL at the outgoing line remains in operation, the circuit breaker 1DL at the incoming line is put into operation, and 2DL remains in the power-off maintenance state;

[0021] S3, then install a new switch A4 to cascade with A3, and then disconnect the incoming line circuit breaker 1DL or the outgoing line circuit breaker 3DL and the isolating switches at both ends of the circuit breaker in S1 that were previously kept in operation, and switch the incoming line circuit breaker 1DL or the outgoing line circuit breaker 3DL and the isolating switches at both ends of the circuit breaker in S1 that were previously kept in operation to a power outage maintenance state, and reconnect its secondary equipment from switches A1 and A2 to A4, and change the aggregation level connection between the original A1 switch and the station bus interval to the aggregation level connection between the A3 switch and the station bus interval, replacing the cascade between A1 and A3; then switches A1 and A2 are completely withdrawn and dismantled, and the circuit breakers that remain in operation in 2DL and S1 are put back into operation.

[0022] In a preferred solution, the above transformation specifically includes the following steps:

[0023] Initial state: The initial state is the normal operating state, all switches and disconnectors are in the closed state, incoming line 1 sends load to the system, and outgoing line 1 sends load to the line;

[0024] Step 1: Install a new switch A3;

[0025] Step 2: Cascade the new switch A3 with the original switch A1 to verify that the communication between switch A3 and the substation process layer network is normal;

[0026] Step 3: Shut down incoming line 1, disconnect 1DL, 5011, 5012 in sequence, and then disconnect 2DL, 5021, 5022, and switch 1DL and 2DL to power-off maintenance state, 3DL remains in operation, and outgoing line 1 is powered on;

[0027] Step 4: Reroute the power outage 1DL, 2DL and the corresponding secondary equipment of the incoming line, including protection, measurement and control, and intelligent terminal network interfaces from the A1 and A2 switches to the A3 switch;

[0028] Step 5: Test the reconnected device in step 4 to verify that the network communication data is sent and received correctly;

[0029] Step 6: Put 1DL into operation, power on line 1, and keep 2DL in power-off state for maintenance;

[0030] Step 7: Install a new switch A4, cascade A4 with A3, and verify that it communicates normally with the substation process layer network;

[0031] Step 8: Open 3DL, 5031, and 5032 in sequence, switch 3DL to power-off maintenance state, and shut down outgoing line 1;

[0032] Step 9: Change the secondary equipment corresponding to the power outage 3DL and outgoing lines, including protection, measurement and control, and intelligent terminal network interfaces, from the A1 and A2 switches to the A4 switch;

[0033] Step 10: Test the reconnected device in step 9 to verify that the network communication data is sent and received correctly;

[0034] Step 11: Change the original A1 switch and the aggregation level connection of the station bus bay to the aggregation level connection of the A3 switch and the station bus bay, replacing the cascade between A1 and A3;

[0035] Step 12: Test and verify that A3, A4 and the bus bay network communication send and receive data correctly;

[0036] Step 13: A1 and A2 are completely removed and can be dismantled;

[0037] Step 14: Put 2DL and 3DL into operation, and start power supply of outgoing line 1.

[0038] In a preferred embodiment, the above transformation comprises the following steps:

[0039] Initial state: The initial state is the normal operating state, all switches and disconnectors are in the closed state, incoming line 1 sends load to the system, and outgoing line 1 sends load to the line;

[0040] Step 1: Install a new switch A3;

[0041] Step 2: Cascade the new switch A3 with the original switch A1 to verify that the communication between switch A3 and the substation process layer network is normal;

[0042] Step 3: Shut down outgoing line 1, open 2DL, 5021, 5022 in sequence, and then open 3DL, 5031, 5032 in sequence, and switch 2DL and 3DL to power-off maintenance state, 1DL remains in operation, and incoming line 1 is powered on and running;

[0043] Step 4: Change the secondary equipment corresponding to the power outage 2DL, 3DL and outgoing lines, including protection, measurement and control, and intelligent terminal network interfaces from A1 and A2 switches to A3 switch;

[0044] Step 5: Test the reconnected device in step 4 to verify that the network communication data is sent and received correctly;

[0045] Step 6: Put 3DL into operation, power outgoing line 1 is in operation, and 2DL remains in power outage for maintenance;

[0046] Step 7: Install a new switch A4, cascade A4 with A3, and verify that it communicates normally with the substation process layer network;

[0047] Step 8: Open 1DL, 5011, and 5012 in sequence, switch 1DL to power-off maintenance state, and shut down incoming line 1;

[0048] Step 9: Change the secondary equipment corresponding to the power outage 1DL and the incoming line, including protection, measurement and control, and intelligent terminal network interfaces, from the A1 and A2 switches to the A4 switch;

[0049] Step 10: Test the reconnected device in step 9 to verify that the network communication data is sent and received correctly;

[0050] Step 11: Change the original A1 switch and the aggregation level connection of the station bus bay to the aggregation level connection of the A3 switch and the station bus bay, replacing the cascade between A1 and A3;

[0051] Step 12: Test and verify that A3, A4 and the bus bay network communication send and receive data correctly;

[0052] Step 13: A1 and A2 are completely removed and can be dismantled;

[0053] Step 14: Put 1DL and 2DL into operation, and start power supply of incoming line 1.

[0054] The present invention provides a method for transforming a process layer switch in a string of a two-thirds wiring intelligent substation, which optimizes the power outage mode of the incoming and outgoing line switches during the transformation of a single string process layer switch, first stops the incoming line and then the outgoing line, or first stops the outgoing line and then the incoming line, and completes the migration of the network interface of the corresponding secondary equipment from the old switch to the new switch in this power outage sequence, and finally completes the transformation of the single string process layer switch, narrows the power outage scope, increases the operating time of the incoming and outgoing lines in the transformation interval, and improves the power generation and supply efficiency and operation reliability of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0056] Figure 1 Schematic diagram of a single string bay in a smart substation with two-thirds wiring. DETAILED DESCRIPTION

[0057] The technical solution of the present invention is described in detail below in conjunction with the accompanying drawings and embodiments.

[0058] A method for transforming a process layer switch in a string of a two-thirds wiring intelligent substation. During the transformation process:

[0059] S1. First, use the new switch A3 to cascade with the original switch A1, then keep the circuit breaker 1DL at the incoming line end or the circuit breaker 3DL at the outgoing line end running, disconnect other circuit breakers and the isolation switches at both ends, and reconnect the secondary equipment corresponding to the out-of-service circuit breakers from switches A1 and A2 to A3;

[0060] S2. If the incoming circuit breaker 1DL remains in operation, the outgoing circuit breaker 3DL is put into operation, and 2DL remains in the power-off maintenance state;

[0061] If the circuit breaker 3DL at the outgoing line remains in operation, the circuit breaker 1DL at the incoming line is put into operation, and 2DL remains in the power-off maintenance state;

[0062] S3, then install a new switch A4 to cascade with A3, and then disconnect the incoming line circuit breaker 1DL or the outgoing line circuit breaker 3DL and the isolating switches at both ends of the circuit breaker in S1 that were previously kept in operation, and switch the incoming line circuit breaker 1DL or the outgoing line circuit breaker 3DL and the isolating switches at both ends of the circuit breaker in S1 that were previously kept in operation to a power outage maintenance state, and reconnect its secondary equipment from switches A1 and A2 to A4, and change the aggregation level connection between the original A1 switch and the station bus interval to the aggregation level connection between the A3 switch and the station bus interval, replacing the cascade between A1 and A3; then switches A1 and A2 are completely withdrawn and dismantled, and the circuit breakers that remain in operation in 2DL and S1 are put back into operation.

[0063] In a preferred solution, the above transformation specifically includes the following steps:

[0064] Initial state: The initial state is the normal operating state, all switches and disconnectors are in the closed state, incoming line 1 sends load to the system, and outgoing line 1 sends load to the line;

[0065] Step 1: Install a new switch A3;

[0066] Step 2: Cascade the new switch A3 with the original switch A1 to verify that the communication between switch A3 and the substation process layer network is normal;

[0067] Step 3: Shut down incoming line 1, disconnect 1DL, 5011, 5012 in sequence, and then disconnect 2DL, 5021, 5022, and switch 1DL and 2DL to power-off maintenance state, 3DL remains in operation, and outgoing line 1 is powered on;

[0068] Step 4: Reroute the power outage 1DL, 2DL and the corresponding secondary equipment of the incoming line, including protection, measurement and control, and intelligent terminal network interfaces from the A1 and A2 switches to the A3 switch;

[0069] Step 5: Test the reconnected device in step 4 to verify that the network communication data is sent and received correctly;

[0070] Step 6: Put 1DL into operation, power on line 1, and keep 2DL in power-off state for maintenance;

[0071] Step 7: Install a new switch A4, cascade A4 with A3, and verify that it communicates normally with the substation process layer network;

[0072] Step 8: Open 3DL, 5031, and 5032 in sequence, switch 3DL to power-off maintenance state, and shut down outgoing line 1;

[0073] Step 9: Change the secondary equipment corresponding to the power outage 3DL and outgoing lines, including protection, measurement and control, and intelligent terminal network interfaces, from the A1 and A2 switches to the A4 switch;

[0074] Step 10: Test the reconnected device in step 9 to verify that the network communication data is sent and received correctly;

[0075] Step 11: Change the original A1 switch and the aggregation level connection of the station bus bay to the aggregation level connection of the A3 switch and the station bus bay, replacing the cascade between A1 and A3;

[0076] Step 12: Test and verify that A3, A4 and the bus bay network communication send and receive data correctly;

[0077] Step 13: A1 and A2 are completely removed and can be dismantled;

[0078] Step 14: Put 2DL and 3DL into operation, and start power supply of outgoing line 1.

[0079] The switch conversion for each process layer takes 2 days, the incoming line 1 needs to be shut down for 2 days, and the outgoing line 1 needs to be shut down for 2 days. The outage schedule for this method is shown in Table 2.

[0080] Table 2: Transformation method proposed by the present invention - power outage schedule

[0081]

[0082] In a preferred embodiment, the above transformation comprises the following steps:

[0083] Initial state: The initial state is the normal operating state, all switches and disconnectors are in the closed state, incoming line 1 sends load to the system, and outgoing line 1 sends load to the line;

[0084] Step 1: Install a new switch A3;

[0085] Step 2: Cascade the new switch A3 with the original switch A1 to verify that the communication between switch A3 and the substation process layer network is normal;

[0086] Step 3: Shut down outgoing line 1, open 2DL, 5021, 5022 in sequence, and then open 3DL, 5031, 5032 in sequence, and switch 2DL and 3DL to power-off maintenance state, 1DL remains in operation, and incoming line 1 is powered on and running;

[0087] Step 4: Change the secondary equipment corresponding to the power outage 2DL, 3DL and outgoing lines, including protection, measurement and control, and intelligent terminal network interfaces from A1 and A2 switches to A3 switch;

[0088] Step 5: Test the reconnected device in step 4 to verify that the network communication data is sent and received correctly;

[0089] Step 6: Put 3DL into operation, power outgoing line 1 is in operation, and 2DL remains in power outage for maintenance;

[0090] Step 7: Install a new switch A4, cascade A4 with A3, and verify that it communicates normally with the substation process layer network;

[0091] Step 8: Open 1DL, 5011, and 5012 in sequence, switch 1DL to power-off maintenance state, and shut down incoming line 1;

[0092] Step 9: Change the secondary equipment corresponding to the power outage 1DL and the incoming line, including protection, measurement and control, and intelligent terminal network interfaces, from the A1 and A2 switches to the A4 switch;

[0093] Step 10: Test the reconnected device in step 9 to verify that the network communication data is sent and received correctly;

[0094] Step 11: Change the original A1 switch and the aggregation level connection of the station bus bay to the aggregation level connection of the A3 switch and the station bus bay, replacing the cascade between A1 and A3;

[0095] Step 12: Test and verify that A3, A4 and the bus bay network communication send and receive data correctly;

[0096] Step 13: A1 and A2 are completely removed and can be dismantled;

[0097] Step 14: Put 1DL and 2DL into operation, and start power supply of incoming line 1.

[0098] The switch conversion for each process layer takes 2 days, the incoming line 1 needs to be shut down for 2 days, and the outgoing line 1 needs to be shut down for 2 days. The outage schedule for this method is shown in Table 3.

[0099] Table 3 Power outage schedule of the second transformation method proposed by the present invention

[0100]

Claims

1. A method for transforming a process layer switch in a string of a two-thirds wiring intelligent substation, characterized in that: During the transformation process: The structure of the original two-thirds connection substation is as follows: the original switches A1 and A2 are cascaded with each other, and the switches A1 and A2 are connected to the secondary equipment of the incoming circuit breaker 1DL, the intermediate circuit breaker 2DL and the outgoing circuit breaker 3DL; the incoming circuit breaker 1DL, the intermediate circuit breaker 2DL and the outgoing circuit breaker 3DL are connected in series, the incoming circuit breaker 1DL is connected to the I bus, and the outgoing circuit breaker 3DL is connected to the II bus. Isolation switches 5011 and 5012 are respectively provided at both ends of the incoming circuit breaker 1DL, and the isolation switch 5011 is on the I bus side. Isolation switches 5021 and 5022 are respectively provided at both ends of the intermediate circuit breaker 2DL, and the isolation switch 5021 is on the I bus side. Isolation switches 5031 and 5032 are respectively provided at both ends of the outgoing circuit breaker 3DL, and the isolation switch 5031 is on the I bus side. S1. First, use the new switch A3 to cascade with the original switch A1, then keep the circuit breaker 1DL at the incoming line end or the circuit breaker 3DL at the outgoing line end running, disconnect other circuit breakers and the isolation switches at both ends, and reconnect the secondary equipment corresponding to the out-of-service circuit breakers from switches A1 and A2 to A3; S2. If the incoming circuit breaker 1DL remains in operation, the outgoing circuit breaker 3DL is put into operation, and 2DL remains in the power-off maintenance state; If the circuit breaker 3DL at the outgoing line remains in operation, the circuit breaker 1DL at the incoming line is put into operation, and 2DL remains in the power-off maintenance state; S3, then install a new switch A4 to cascade with A3, and then disconnect the incoming line circuit breaker 1DL or the outgoing line circuit breaker 3DL and the isolating switches at both ends of the circuit breaker in S1 that were previously kept in operation, and switch the incoming line circuit breaker 1DL or the outgoing line circuit breaker 3DL and the isolating switches at both ends of the circuit breaker in S1 that were previously kept in operation to a power outage maintenance state, and reconnect its secondary equipment from switches A1 and A2 to A4, and change the aggregation level connection between the original A1 switch and the station bus interval to the aggregation level connection between the A3 switch and the station bus interval, replacing the cascade between A1 and A3; then switches A1 and A2 are completely withdrawn and dismantled, and the circuit breakers that remain in operation in 2DL and S1 are put back into operation.

2. According to the method for transforming the process layer switch in a string of a two-thirds wiring intelligent substation as described in claim 1, it is characterized in that: The transformation specifically comprises the following steps: Initial state: The initial state is the normal operation state, all switches and disconnectors are in the closed state, incoming line 1 sends load to the system, and outgoing line 1 sends load to the line; Step 1: Install a new switch A3; Step 2: Cascade the new switch A3 with the original switch A1 to verify that the communication between switch A3 and the substation process layer network is normal; Step 3: Shut down incoming line 1, disconnect 1DL, 5011, 5012 in sequence, and then disconnect 2DL, 5021, 5022, and switch 1DL and 2DL to power-off maintenance state, 3DL remains in operation, and outgoing line 1 is powered on; Step 4: Reroute the power outage 1DL, 2DL and the corresponding secondary equipment of the incoming line, including protection, measurement and control, and intelligent terminal network interfaces from the A1 and A2 switches to the A3 switch; Step 5: Test the reconnected device in step 4 to verify that the network communication data is sent and received correctly; Step 6: Put 1DL into operation, power on line 1, and keep 2DL in power-off state for maintenance; Step 7: Install a new switch A4, cascade A4 with A3, and verify that it communicates normally with the substation process layer network; Step 8: Pull open 3DL, 5031, and 5032 in sequence, switch 3DL to power-off maintenance state, and shut down outgoing line 1; Step 9: Change the secondary equipment corresponding to the power outage 3DL and outgoing lines, including protection, measurement and control, and intelligent terminal network interfaces, from the A1 and A2 switches to the A4 switch; Step 10: Test the reconnected device in step 9 to verify that the network communication data is sent and received correctly; Step 11: Change the original A1 switch and the aggregation level connection of the station bus bay to the aggregation level connection of the A3 switch and the station bus bay, replacing the cascade between A1 and A3; Step 12: Test and verify that A3, A4 and the bus bay network communication send and receive data correctly; Step 13: A1 and A2 are completely removed and can be dismantled; Step 14: Put 2DL and 3DL into operation, and start power supply of outgoing line 1.

3. A method for transforming a process layer switch in a string of a two-thirds wiring intelligent substation according to claim 1, characterized in that: The transformation comprises the following steps: Initial state: The initial state is the normal operating state, all switches and disconnectors are in the closed state, incoming line 1 sends load to the system, and outgoing line 1 sends load to the line; Step 1: Install a new switch A3; Step 2: Cascade the new switch A3 with the original switch A1 to verify that the communication between switch A3 and the substation process layer network is normal; Step 3: Shut down outgoing line 1, open 2DL, 5021, 5022 in sequence, and then open 3DL, 5031, 5032 in sequence, and switch 2DL and 3DL to power-off maintenance state, 1DL remains in operation, and incoming line 1 is powered on and running; Step 4: Change the secondary equipment corresponding to the power outage 2DL, 3DL and outgoing lines, including protection, measurement and control, and intelligent terminal network interfaces from A1 and A2 switches to A3 switch; Step 5: Test the reconnected device in step 4 to verify that the network communication data is sent and received correctly; Step 6: Put 3DL into operation, power outgoing line 1 is in operation, and 2DL remains in power outage for maintenance; Step 7: Install a new switch A4, cascade A4 with A3, and verify that it communicates normally with the substation process layer network; Step 8: Open 1DL, 5011, and 5012 in sequence, switch 1DL to power-off maintenance state, and shut down incoming line 1; Step 9: Change the power outage 1DL and the corresponding secondary equipment including protection, measurement and control, and intelligent terminal network interfaces from A1 and A2 switches to A4 switch; Step 10: Test the reconnected device in step 9 to verify that the network communication data is sent and received correctly; Step 11: Change the original A1 switch and the aggregation level connection of the station bus bay to the aggregation level connection of the A3 switch and the station bus bay, replacing the cascade between A1 and A3; Step 12: Test and verify that A3, A4 and the bus bay network communication send and receive data correctly; Step 13: A1 and A2 are completely removed and can be dismantled; Step 14: Put 1DL and 2DL into operation, and start power supply of incoming line 1.

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