CN116565847A - Automatic control method for changing hydropower station into serial from operation to maintenance - Google Patents
Automatic control method for changing hydropower station into serial from operation to maintenance Download PDFInfo
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- CN116565847A CN116565847A CN202310530765.5A CN202310530765A CN116565847A CN 116565847 A CN116565847 A CN 116565847A CN 202310530765 A CN202310530765 A CN 202310530765A CN 116565847 A CN116565847 A CN 116565847A
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- 238000012423 maintenance Methods 0.000 title description 7
- 238000002955 isolation Methods 0.000 claims abstract description 20
- 238000012544 monitoring process Methods 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 9
- 238000001816 cooling Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
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Abstract
The automatic control method of the 500kV hydropower station in-line running-to-overhauling monitoring system comprises a method for in-line running-to-cold standby, and the method comprises the following steps of 1, when an operation starting command is received, judging whether the following operation conditions are met: the string entering operation is normal, the voltage and the string entering frequency are normal, the machine set is stopped, the outlet switch and the outlet disconnecting link of the generator-transformer set are disconnected, the LCU has no fault, and the control mode of the circuit breaker and the isolation disconnecting link is remote, and the circuit breaker and the isolation disconnecting link have no fault; step 2, pulling the middle switch open to confirm that the breaker is normally opened; and step 3, pulling the incoming line side switch open to confirm that the breaker is normally opened. The invention fully utilizes the set condition to execute judgment and reasonable operation to execute the operation of equipment such as a breaker, a disconnecting link, a ground knife and the like in the process of running, overhauling and operating 500kV string, shortens the operation time, lightens the workload of operators, ensures the whole operation process to be accurate and error-free, and is beneficial to improving the safety production level of a power plant.
Description
Technical Field
The invention relates to an automatic control method for converting running into overhauling of a hydropower station in-line.
Background
The 500kV string feeding equipment (hereinafter referred to as string feeding) of the hydropower station with 3/2 wiring main wiring is important equipment of an electric main system, so that power failure maintenance is required to be carried out on the equipment regularly, currently, the 500kV string feeding equipment is operated by operation and maintenance once equipment, operation personnel generally operate on a monitoring system and an equipment site after the operation condition is met, the whole operation process is carried out by the operation personnel, double confirmation of the monitoring system and the equipment site is required before and after each operation step, and the operation sequence of the equipment is very high. When the operation sequence is wrong and the equipment operation locking fails, the system is possibly grounded in a live mode or equipment is possibly damaged, and hidden danger is brought to safe and stable operation of the power grid.
Disclosure of Invention
The invention aims to solve the technical problems of providing the automatic control method for the running-to-overhauling of the hydropower station in-series by-series running, which fully utilizes the set condition to execute judgment and reasonable operation to execute the operation of equipment such as a breaker, a disconnecting link, a ground knife and the like in the running-to-overhauling operation process of the 500kV in-series by-series running-to-overhauling, thereby shortening the operation time, reducing the workload of operators, ensuring the whole operation process to be accurate and error-free and being beneficial to improving the safety production level of a power plant.
In order to solve the problems, the technical scheme of the invention is as follows:
an automatic control method for changing the running of a hydropower station into the overhauling of the hydropower station comprises a standby method for changing the running of the hydropower station into the cooling of the hydropower station, the method for converting the running into the cold standby mode of the string entering comprises the following steps of:
step 1, after receiving an operation start command, judging whether the following operation conditions are met: the string entering operation is normal, the voltage and the string entering frequency are normal, the machine set is stopped, the outlet switch and the outlet disconnecting link of the generator-transformer set are disconnected, the LCU has no fault, and the control mode of the circuit breaker and the isolation disconnecting link is remote, and the circuit breaker and the isolation disconnecting link have no fault;
step 2, pulling the middle switch open to confirm that the breaker is normally opened;
step 3, pulling the incoming line side switch open to confirm that the breaker is normally opened;
step 4, judging whether the incoming line disconnecting link and the isolation disconnecting link have a disconnecting link condition, and if so, entering the next step;
step 5, sequentially pulling the isolating knife switches on the two sides of the middle switch, and confirming that the isolating knife switches are in the switch-off positions;
step 6, pulling the isolating knife switches on two sides of the incoming line side switch in sequence, and confirming that the isolating knife switch states are all in the switch-off position;
and 7, pulling the wire inlet disconnecting link open to confirm that the disconnecting link state is at the disconnecting link position.
The method for overhauling the cold standby rotary of the feeding string comprises the following steps of:
step 1, after receiving a starting command, manually confirming that the incoming line short-circuit protection and the circuit breaker protection are withdrawn;
step 2, judging whether the following operation conditions are provided: judging whether the grounding disconnecting link at both sides of the incoming line side switch and the middle switch has a closing condition or not, judging whether the grounding disconnecting link and the LCU have faults or not, and if the grounding disconnecting link has the closing condition and has no faults, entering the next step;
and 3, sequentially closing the grounding disconnecting link at two sides of the wire inlet disconnecting link.
The beneficial effects of the invention are as follows: the operation performed by operators in the whole process is changed into one-key operation, so that the system is electrified to be grounded or the equipment is damaged when the equipment is locked and fails, the whole operation process can be ensured to be accurate, and the safety and stability of the power grid are ensured.
Drawings
The invention is further described with reference to the accompanying drawings:
figure 1 is a logic diagram of the present invention regarding "run-to-cold standby operation enabled",
FIG. 2 is a logic diagram of the present invention regarding "isolation knife break permission",
figure 3 is a logic diagram of the present invention regarding "enter string enabled by cold standby to service operation",
figure 4 is a flow chart of the invention for converting the running into the cold standby operation of the stringing device,
figure 5 is a flow chart of the cold standby rotary overhauling operation of the stringing device,
fig. 6 is an electrical diagram of the present invention.
Detailed Description
The automatic control method for the 500kV hydropower station in-line operation-to-overhaul monitoring system comprises the following steps:
1. the 500kV string-entering running-to-cooling standby method comprises the following steps of:
step 1, after receiving the start command, judging whether the following operation conditions are met: the string entering operation is normal, the voltage and the string entering frequency are normal, the machine set is stopped, the outlet switches F1 and F2 of the variable group and the outlet switches F11 and F21 are separated, the LCU has no fault, the control mode of the circuit breaker and the isolation switch is far away, the circuit breaker and the isolation switch have no fault, the corresponding protection investment is realized, and if the condition is not met, the alarm is given and the machine set exits; if the above conditions are satisfied, the process proceeds to the next step.
And step 2, pulling the middle switch X2 open to confirm that the breaker is normally opened. If the condition is not satisfied, prompting the operation failure and warning to exit; if the condition is satisfied, the next step is performed.
And step 3, pulling the incoming line side switch X1 open to confirm that the breaker is normally opened. If the condition is not satisfied, prompting the operation failure and warning to exit; if the condition is satisfied, the next step is performed.
And 4, judging that the incoming line disconnecting link X16, the isolation disconnecting links X11, X12, X21 and X22 have a disconnecting condition. If the existence condition is not satisfied, alarming and exiting; if the above conditions are satisfied, the process proceeds to the next step.
Step 5, sequentially starting the isolating switches X22 and X21 on the two sides of the switch X2 in the pulling process (the switching-off sequence of the isolating switches can be set, and firstly pulling off the line side switch of the power-off circuit breaker and then pulling off the bus side switch of the power-off circuit breaker), and confirming that the states of the isolating switches X22 and X21 are both in the switching-off positions. If the existence condition is not satisfied, prompting the operation failure and warning to exit; if the conditions are satisfied, the next step is performed.
Step 6, sequentially starting to pull apart the isolating knife switches X12 and X11 at the two sides of the incoming line side switch X1, and confirming that the states of the knife switches X12 and X11 are all in the switch-off positions. If the existence condition is not satisfied, prompting the operation failure and warning to exit; if the conditions are satisfied, the next step is performed.
And 7, starting to pull the wire inlet disconnecting link X16, and confirming that the state of the X16 disconnecting link is at the disconnecting link position. If the condition is not satisfied, prompting the operation failure and warning to exit; and if the condition is met, ending.
2. The 500kV string-entering cold standby rotary overhauling method comprises the following steps of:
and step 1, after receiving a starting command, manually confirming that the incoming line short-circuit protection and the circuit breaker protection are withdrawn. If the condition is not satisfied, prompting the operation failure and warning to exit, and if the condition is satisfied, proceeding to the next step.
Step 2, judging whether the following operation conditions are provided: the grounding knife switches X117, X127, X217 and X227 on the two sides of X1 and X2 and the grounding knife switches X167 and X1617 on the two sides of X16 have closing conditions, the grounding knife switch control mode is far, the grounding knife switch has no fault, and the LCU has no fault. If the existence condition is not satisfied, prompting the operation failure and warning to exit; if all conditions are satisfied, the next step is performed.
And step 3, sequentially issuing grounding knife switches X167 and X1617 on two sides of the closed X16 and grounding knife switches X117, X127, X217 and X227 on two sides of the X1 and the X2. If the existence condition is not satisfied, prompting the operation failure and warning to exit; if all conditions are satisfied, ending.
Description: the automatic operation method of the 500kV string entering and maintaining monitoring system is designed into two stages with a sequence, wherein the first stage is a 500kV string entering and maintaining method, the second stage is blocked by the flow of the first stage, and the second stage can be started only after the first stage is executed.
The control system is provided with a button for 500kV serial-in-serial-out maintenance operation, and two buttons of a serial-in-cold standby flow and a serial-in-cold standby-to-maintenance flow are displayed after the buttons are turned on for operators to select operation. Meanwhile, a logic diagram for judging whether basic operation conditions of the first-stage operation flow are met is designed in the control system, and the conditions of no fault of LCU, normal operation of string entering equipment, normal voltage and string entering frequency, shutdown of unit A, opening of the outlet switch F1 and the outlet switch F11 of the variable group, shutdown of unit B, opening of the outlet switch F2 and the outlet switch F21 of the variable group, remote control of a breaker, remote control of the isolation switch, no fault of the breaker, no fault of the isolation switch and full satisfaction of protection input are all met, so that operators are prompted to operate by one key. The logic diagram for judging whether basic operation conditions of the second-stage flow operation flow are met is designed in the control system, and the nine conditions of LCU fault-free, X167 opening and closing condition OK, X1617 opening and closing condition OK, X117 opening and closing condition OK, X127 opening and closing condition OK, X217 opening and closing condition OK, X227 opening and closing condition OK, grounding switch control mode in a far place and grounding switch fault-free are all met, so that an operator is prompted to operate by one key.
In the first stage step 1, it is mainly determined whether the basic conditions of the operation flow are met, and the conditions of "LCU has no fault", "string entering equipment operates normally, voltage and string entering frequency are normal", "unit a has been stopped, switch-off of switch-off set outlet switch F1 and switch-off switch F11", "unit B has been stopped, switch-off of switch-off set outlet switch F2 and switch-off switch F21", "circuit breaker control mode is remote", "isolation switch control mode is remote", "circuit breaker has no fault", "isolation switch has no fault", and "protection input" are all met to perform the subsequent operation. The logic diagram is shown in figure 1.
In the steps 2 and 3 of the first stage, the switch X2 and the incoming side switch X1 are turned off, respectively, and the incoming string is subjected to power failure operation.
In the step 4 of the first stage, the "incoming line disconnecting link X16, the isolating disconnecting links X11, X12, X21, X22 have the disconnecting conditions" that is, the incoming line side switch X1 and the middle switch X2 are all at the disconnecting positions, the outgoing line group outlet disconnecting links F11, F21 are at the disconnecting positions, and the grounding disconnecting links X117, X127, X217, X227 on both sides of the ii M bus grounding disconnecting links, X1, X2 and the grounding disconnecting links X167, X1617 on both sides of X16 are all at the disconnecting positions. The logic diagram is shown in fig. 2.
In the step 5 of the first stage, the two sides of the middle switch X2 are pulled to isolate the knife switches X22 and X21, and the pulling sequence meets the requirements of the load side and the power side. The disconnecting link at the line side is the load side disconnecting link, the disconnecting operation is performed preferentially, and the disconnecting operation of the disconnecting link at the bus side of the circuit breaker is performed secondarily.
In the step 6 of the first stage, the isolation switches X12 and X11 on both sides of the incoming line side switch X1 are pulled apart.
In the step 7 of the first stage, the wire inlet knife switch X16 is pulled open.
When the equipment is in an operating state, the related protection of 'incoming line short-difference protection' and 'circuit breaker protection' are in an input state, and after the first-stage automatic operation flow, the related equipment is in a cold standby state, and the related protection needs to be exited before the string entering equipment is put into an overhaul mode. In the step 1 of the second stage, the "incoming short-circuit protection" and the "breaker protection" are manually confirmed to be exited.
In the step 2 of the second stage, the "grounding switches X117, X127, X217, X227 on both sides of X1 and X2 and the grounding switches X167 and X1617 on both sides of X16 have the closing condition", that is, the isolation switches X11 and X12 on both sides of X1 are required to be at the opening positions, the isolation switches X21 and X22 on both sides of X2 are required to be at the opening positions, and the incoming line switch X16 and the switch-out switch F11 and F21 are all at the opening positions. Meanwhile, the three conditions of the remote earthing knife switch control mode, the earthing knife switch fault-free and the LCU fault-free are all met, so that the follow-up operation can be performed. The logic diagram is shown in fig. 3.
In the step 3 of the second stage, the grounding switches X167 and X1617 on both sides of the X16 and the grounding switches X117, X127, X217 and X227 on both sides of the X1 and X2 are closed, and the serial-conversion maintenance related control system is completed.
Claims (3)
1. The automatic control method for the running-to-overhauling of the hydropower station in the running mode is characterized by comprising a standby method for running the hydropower station in the running mode and turning the hydropower station in the running mode, and the standby method for running the hydropower station in the running mode and turning the hydropower station in the running mode comprises the following steps:
step 1, after receiving an operation start command, judging whether the following operation conditions are met: the string entering operation is normal, the voltage and the string entering frequency are normal, the machine set is stopped, the outlet switch and the outlet disconnecting link of the generator-transformer set are disconnected, the LCU has no fault, and the control mode of the circuit breaker and the isolation disconnecting link is remote, and the circuit breaker and the isolation disconnecting link have no fault;
step 2, pulling the middle switch open to confirm that the breaker is normally opened;
step 3, pulling the incoming line side switch open to confirm that the breaker is normally opened;
step 4, judging whether the incoming line disconnecting link and the isolation disconnecting link have a disconnecting link condition, and if so, entering the next step;
step 5, sequentially pulling the isolating knife switches on the two sides of the middle switch, and confirming that the isolating knife switches are in the switch-off positions;
step 6, pulling the isolating knife switches on two sides of the incoming line side switch in sequence, and confirming that the isolating knife switch states are all in the switch-off position;
and 7, pulling the wire inlet disconnecting link open to confirm that the disconnecting link state is at the disconnecting link position.
2. The automatic control method for the running-to-overhauling of hydropower station in-line feeding according to claim 1, wherein the method comprises the following steps: the method for overhauling the cold standby rotary of the feeding string comprises the following steps of:
step 1, after receiving a starting command, manually confirming that the incoming line short-circuit protection and the circuit breaker protection are withdrawn;
step 2, judging whether the following operation conditions are provided: judging whether the grounding disconnecting link at both sides of the incoming line side switch and the middle switch has a closing condition or not, judging whether the grounding disconnecting link and the LCU have faults or not, and if the grounding disconnecting link has the closing condition and has no faults, entering the next step;
and 3, sequentially closing the grounding disconnecting link at two sides of the wire inlet disconnecting link.
3. The automatic control method for the running-to-overhauling of hydropower station in-line feeding according to claim 1, wherein the method comprises the following steps: and step 4, judging whether the incoming line disconnecting link and the isolation disconnecting link have disconnecting link conditions or not, wherein the incoming line side switch, the middle switch, the switch-out group outlet disconnecting link and the grounding disconnecting link are all in disconnecting link positions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310530765.5A CN116565847A (en) | 2023-05-10 | 2023-05-10 | Automatic control method for changing hydropower station into serial from operation to maintenance |
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| CN202310530765.5A CN116565847A (en) | 2023-05-10 | 2023-05-10 | Automatic control method for changing hydropower station into serial from operation to maintenance |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117220408A (en) * | 2023-08-29 | 2023-12-12 | 中国长江电力股份有限公司 | Automatic operation method of hydropower station 10kV bus from operation to maintenance monitoring system |
| CN117411188A (en) * | 2023-11-30 | 2024-01-16 | 中国长江电力股份有限公司 | Automatic operation flow of hydropower station 500kV outgoing line route overhaul transfer operation monitoring system |
| CN117614103A (en) * | 2023-11-27 | 2024-02-27 | 中国长江电力股份有限公司 | Automatic switching method for power station 400V station power T-connection switch |
-
2023
- 2023-05-10 CN CN202310530765.5A patent/CN116565847A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117220408A (en) * | 2023-08-29 | 2023-12-12 | 中国长江电力股份有限公司 | Automatic operation method of hydropower station 10kV bus from operation to maintenance monitoring system |
| CN117220408B (en) * | 2023-08-29 | 2024-07-16 | 中国长江电力股份有限公司 | Automatic operation method of hydropower station 10kV bus from operation to maintenance monitoring system |
| CN117614103A (en) * | 2023-11-27 | 2024-02-27 | 中国长江电力股份有限公司 | Automatic switching method for power station 400V station power T-connection switch |
| CN117411188A (en) * | 2023-11-30 | 2024-01-16 | 中国长江电力股份有限公司 | Automatic operation flow of hydropower station 500kV outgoing line route overhaul transfer operation monitoring system |
| CN117411188B (en) * | 2023-11-30 | 2024-06-11 | 中国长江电力股份有限公司 | Automatic operation method of hydropower station 500kV outgoing line route overhaul transfer operation monitoring system |
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