CN113725822A - Method and system for removing fault of 220kV bus - Google Patents
Method and system for removing fault of 220kV bus Download PDFInfo
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- CN113725822A CN113725822A CN202010456049.3A CN202010456049A CN113725822A CN 113725822 A CN113725822 A CN 113725822A CN 202010456049 A CN202010456049 A CN 202010456049A CN 113725822 A CN113725822 A CN 113725822A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
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Abstract
The invention discloses a method for removing a 220kV bus fault, which comprises the following steps: when a 220kV bus fails, the bus protection screen simultaneously sends a first control signal to the generator-transformer group protection A/B screen and the generator-transformer group protection C screen, and triggers the generator-transformer group protection A/B screen and the generator-transformer group protection C screen to act so as to stop the generator-transformer group completely; the generator-transformer group protection A/B screen acts according to the first control signal to control the switches on all sides of the generator-transformer group to be switched off; and the generator-transformer unit protection C screen acts according to the first control signal to control the switch between the 220kV bus and the main transformer to be disconnected. Correspondingly, a cutting system for 220kV bus failure is also provided. The method can realize the instantaneous shutdown of the switches and the energy of all sides of the unit-to-unit converter after the bus protection action, and avoid the risks of the runaway of a steam turbine, the over-voltage and under-voltage excitation and the loss of voltage of service power.
Description
Technical Field
The invention belongs to the technical field of power system relay protection, and particularly relates to a method and a system for removing a 220kV bus fault.
Background
The main loop wiring mode of the 220kV system of the thermal power plant is generally bus-main transformer-generator and bus-starting and standby transformer, in order to prevent the system from being damaged by bus short circuit, grounding and other faults, a 220kV network protection room is provided with a bus protection device, and when a bus fault occurs, units such as a generating and transforming group and the starting and standby transformer on the bus can be cut off.
The generator-transformer unit is cut off after the bus protection action, and the bus and the generator-transformer unit are isolated by normally adopting a mode of tripping a main transformer high-voltage side switch for 0 second, but a motive power turbine of a generator, a direct-current excitation system and a service system are not stopped or switched instantly, so that the risks of turbine runaway, excitation overpressure undervoltage and service voltage loss exist.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method and a system for removing a 220kV bus fault, which aim to solve the defects in the prior art, realize the instantaneous shutdown of switches and energy on each side of a unit-to-unit converter after the bus protection action, and avoid the risks of steam turbine runaway, excitation overpressure and undervoltage, and station service voltage loss.
In order to achieve the above object, an embodiment of the present invention provides a method for removing a 220kV bus fault, including: when a 220kV bus fails, the bus protection screen simultaneously sends a first control signal to the generator-transformer group protection A/B screen and the generator-transformer group protection C screen, and triggers the generator-transformer group protection A/B screen and the generator-transformer group protection C screen to act so as to stop the generator-transformer group completely; the generator-transformer group protection A/B screen acts according to the first control signal to control the switches on all sides of the generator-transformer group to be switched off; and the generator-transformer unit protection C screen acts according to the first control signal to control the switch between the 220kV bus and the main transformer to be disconnected.
Preferably, the method further comprises: when a 220kV bus fails, the bus protection screen simultaneously sends a second control signal to the starting-standby transformer protection A/B screen and the starting-standby transformer protection operation box, and the starting-standby transformer protection A/B screen and the starting-standby transformer protection operation box are triggered to act so as to stop the transformer completely; the protection A/B screen of the starting-up transformer acts according to the second control signal to control the switches on all sides of the starting-up transformer to be switched off; and the starting-up transformer protection operation box acts according to the second control signal to control the switch between the 220kV bus and the starting-up transformer to be switched off.
Correspondingly, the embodiment of the invention also provides a 220kV bus fault removing system which comprises a generator-transformer group protection A/B screen, a generator-transformer group protection C screen and a bus protection screen. The generator-transformer group protection A/B screen is used for controlling the disconnection of switches at each side of the generator-transformer group; the generator transformer unit protection C screen is used for controlling the disconnection of a switch between a 220kV bus and a main transformer; and the bus protection screen is connected with the generator-transformer group protection A/B screen and the generator-transformer group protection C screen and is used for simultaneously sending a first control signal to the generator-transformer group protection A/B screen and the generator-transformer group protection C screen when a 220kV bus fails so as to trigger the generator-transformer group protection A/B screen and the generator-transformer group protection C screen to act and further control the generator-transformer group to stop completely.
Preferably, the generator-transformer group protection A/B screen is connected with the generator-transformer group protection C screen, and the generator-transformer group protection A/B screen is further used for sending a third control signal to the generator-transformer group protection C screen to control the generator-transformer group protection C screen to act.
Preferably, each side switch of the generator-transformer group comprises a de-excitation switch and a main valve. The de-excitation switch is connected with the generator-transformer group protection A/B screen and is used for tripping according to the action of the generator-transformer group protection A/B screen so as to disconnect an excitation power supply; and the main throttle valve is connected with the generator-transformer group protection A/B screen and is used for closing according to the action of the generator-transformer group protection A/B screen so as to disconnect the motive power of the generator.
Preferably, each side switch of the generator-transformer group further comprises a quick-switching device. And the quick switching device is connected with the generator-transformer group protection A/B screen and is used for starting according to the action of the generator-transformer group protection A/B screen so as to disconnect a station transformer low-voltage side switch between a station transformer and a 6kV bus.
Preferably, each side switch of the generator-transformer group further comprises a main transformer high-voltage side switch positioned between the 220kV bus and the main transformer. And the main transformer high-voltage side switch is connected with the generator transformer unit protection C screen and is used for disconnecting according to the action of the generator transformer unit protection C screen so as to disconnect the 220kV bus from the main transformer.
Preferably, the system further comprises a starting-up and standby transformer protection A/B screen and a starting-up and standby transformer protection operation box. The protection A/B screen of the starting-up transformer is used for controlling the disconnection of switches on each side of the starting-up transformer; the starting-up transformer protection operation box is used for controlling the disconnection of a switch between a 220kV bus and a starting-up transformer; the bus protection screen is further connected with the starting-standby transformer protection A/B screen and the starting-standby transformer protection operation box and used for sending a second control signal to the starting-standby transformer protection A/B screen and the starting-standby transformer protection operation box simultaneously when a 220kV bus fails so as to trigger the actions of the starting-standby transformer protection A/B screen and the starting-standby transformer protection operation box and further control the transformer to stop completely.
Preferably, the starting-standby transformer protection A/B screen is connected with the starting-standby transformer protection operation box, and the starting-standby transformer protection A/B screen is further used for sending a fourth control signal to the starting-standby transformer protection operation box so as to control the starting-standby transformer protection operation box to act.
Preferably, each side switch of the starting-standby transformer comprises a starting-standby low-voltage side switch and a starting-standby high-voltage side switch located between the 220kV bus and the starting-standby transformer, wherein the starting-standby low-voltage side switch is connected with the starting-standby transformer protection a/B screen and is used for tripping according to the action of the starting-standby transformer protection a/B screen so as to disconnect the 6kV bus from the starting-standby transformer. And the starting-standby high-voltage side switch is connected with the starting-standby transformer protection operation box and is used for disconnecting according to the action of the starting-standby transformer protection operation box so as to disconnect the 220kV bus from the starting-standby transformer.
In the method and the system for removing the 220kV bus fault, provided by the embodiment of the invention, the bus protection screen simultaneously sends control signals to the generator-transformer protection A/B screen and the generator-transformer protection C screen, so that the generator-transformer protection A/B screen controls the switches on all sides of the generator-transformer to be switched off according to the control signals of the bus protection screen, the switches and the energy on all sides of the generator-transformer unit are instantly, safely and reliably shut down after the bus protection action, and the situations of turbine runaway, excitation overvoltage undervoltage and station service voltage loss are avoided.
Drawings
FIG. 1: the invention discloses a wiring schematic diagram of a 220kV bus fault clearing system in an embodiment;
FIG. 2: the other wiring schematic diagram of the 220kV bus fault clearing system is disclosed by the embodiment of the invention;
FIG. 3: the invention relates to a 220kV bus-generator-transformer group/start-up-and-standby transformer primary electrical wiring diagram.
In the figure: the system comprises a 1-bus protection screen, a 2-transformer protection A/B screen, a 3-transformer protection C screen, a 4-fast switching device, a 5-demagnetization switch, a 6-main throttle valve, a 7-main transformer high-voltage side switch, an 8-standby transformer protection A/B screen, a 9-standby transformer protection operation box, a 10-standby transformer low-voltage side switch, a 11-standby transformer high-voltage side switch, a 12-220kV bus, a 13-main transformer, a 14-generator, a 15-standby transformer, a 16-6kV bus, a 17-plant transformer and a 18-plant transformer low-voltage side switch.
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention is further described in detail below with reference to the accompanying drawings and examples.
Example 1:
the present embodiment provides a method for removing a 220kV bus fault, which can be generalized to a removal condition for a bus fault of an extra-high voltage or an extra-high voltage class, and is exemplified as a method for removing a 220kV bus fault in a thermal power plant, as shown in fig. 1 and 3, including:
when a 220kV bus fails, the bus protection screen 1 simultaneously sends a first control signal to the generator-transformer group protection A/B screen 2 and the generator-transformer group protection C screen 3, and triggers the generator-transformer group protection A/B screen 2 and the generator-transformer group protection C screen 3 to act simultaneously so as to stop the generator-transformer group completely; the generator-transformer group protection A/B screen 2 acts according to a first control signal to control switches on all sides of the generator-transformer group to be switched off; and the generator-transformer unit protection C screen 3 acts according to the first control signal to control the switch between the 220kV bus and the main transformer to be disconnected.
In this embodiment, when a 220kV bus has a ground fault and a short-circuit fault, the bus protection screen 1 simultaneously sends a first control signal to the generator-transformer group protection a/B screen 2 and the generator-transformer group protection C screen 3. The protection A/B screen of the generator-transformer group comprises two protection screens with the same function, and the protection A/B screens run simultaneously and are mutually standby. The outlet matrix of the generator-transformer unit protection A/B screen 2 is configured to be a full-stop generator-transformer unit, so that the generator-transformer unit protection A/B screen acts according to a first control signal to control the switch on each side of the generator-transformer unit to be disconnected, and meanwhile, the generator-transformer unit protection C screen 3 acts according to the first control signal to control the switch between the 220kV bus 12 and the main transformer 13 to be disconnected. Therefore, the generator-transformer unit is isolated from the 220kV bus fault, and because the switches on all sides of the generator-transformer unit are disconnected, the generator and the main transformer can be safely and reliably shut down, and the risks of turbine runaway, excitation overpressure undervoltage and station service voltage loss are avoided.
Optionally, the switching protection delay of the configuration generator-transformer group protection A/B screen 2 is 0 second. The protection A/B screen 2 of the generator-transformer unit can delay and send a control instruction for 0 second, so that the generator-transformer unit can be quickly and completely stopped when a 220kV bus fails.
Optionally, as shown in fig. 2, the method for cutting off the 220kV bus in case of fault further includes:
when a 220kV bus fails, the bus protection screen 1 simultaneously sends a second control signal to the starting-standby transformer protection A/B screen 8 and the starting-standby transformer protection operation box 9, and triggers the starting-standby transformer protection A/B screen 8 and the starting-standby transformer protection operation box 9 to simultaneously act so as to completely stop the transformer; the protection A/B screen 8 of the starting-up transformer acts according to the second control signal to control the switches on all sides of the starting-up transformer to be switched off; and the starting-up transformer protection operation box 9 acts according to the second control signal to control the switch between the 220kV bus and the starting-up transformer to be switched off.
In this embodiment, when a 220kV bus fails, the bus protection screen 1 sends a first control signal to the generator-transformer-bank protection a/B screen 2 and the generator-transformer-bank protection C screen 3, and the bus protection screen 1 also sends a second control signal to the backup-transformer-start protection a/B screen 8 and the backup-transformer-start protection operation box 9. The standby transformer protection A/B screen is two protection screens with the same function, and the two protection screens run simultaneously and are mutually standby. The outlet matrix of the starting-standby transformer protection A/B screen 8 is configured to be a full-stop transformer (starting-standby transformer), so that the starting-standby transformer protection A/B screen 8 acts according to a second control signal to control the switching-off of each side of the starting-standby transformer, and meanwhile, the starting-standby transformer protection operation box 9 acts according to the second control signal to control the switching-off of a switch between a 220kV bus and the starting-standby transformer. Therefore, the starting-standby transformer is isolated from the 220kV bus fault, and switches on all sides of the starting-standby transformer are all disconnected, so that the starting-standby transformer can be safely and reliably shut down, the risks of turbine runaway, excitation overpressure undervoltage and station service voltage loss are avoided, and meanwhile, the low-voltage side switch is disconnected due to the fact that the starting-standby transformer becomes low-voltage side switch is not operated due to failure, and the situation that a low-voltage side power supply is returned to the 220kV bus fault point due to the fact that the starting-standby transformer becomes high-voltage side switch is failed can be avoided.
Optionally, the switching protection delay of the standby transformer protection A/B screen 8 is configured to be 0 second. The protection A/B screen 8 of the starting-up backup transformer can delay 0 second to send a control instruction, and therefore the starting-up backup transformer (transformer) can be rapidly and fully stopped when a 220kV bus fails.
Example 2:
as shown in fig. 1, fig. 2, and fig. 3, the present embodiment provides a system for removing a 220kV bus fault, which includes an ac/dc converter group protection a/B screen 2, an ac/dc converter group protection C screen 3, and a bus protection screen 1. The generator transformer group protection A/B screen 2 is used for controlling the disconnection of switches on each side of the generator transformer group; the generator-transformer protection C screen 3 is used for controlling the disconnection of a switch between a 220kV bus 12 and a main transformer 13 (the main transformer 13 is used for boosting the electric energy generated by a generator 14); the bus protection screen 1 is connected with the generator-transformer group protection A/B screen 2 and the generator-transformer group protection C screen 3 and is used for simultaneously sending a first control signal to the generator-transformer group protection A/B screen 2 and the generator-transformer group protection C screen 3 when a 220kV bus 12 fails so as to trigger the actions of the generator-transformer group protection A/B screen 2 and the generator-transformer group protection C screen 3 and further control the generator-transformer group to stop completely.
In this embodiment, the bus protection screen 1 is connected with the generator-transformer group protection a/B screen 2 and the generator-transformer group protection C screen 3 through control cables, respectively. The bus protection screen 1 is used for simultaneously sending a first control signal to the generator-transformer group protection A/B screen 2 and the generator-transformer group protection C screen 3 when a 220kV bus 12 has a grounding and short-circuit fault. The generator-transformer group protection A/B screen 2 is used for controlling the switch on each side of the generator-transformer group to be disconnected according to the first control signal and an exit matrix (for example, a switch value protection tripping matrix of the generator-transformer group protection A/B screen 2 is a 039D full-outage generator-transformer group), and meanwhile, the generator-transformer group protection C screen 3 is used for acting according to the first control signal to control the switch between the 220kV bus 12 and the main transformer 13 to be disconnected. Therefore, the generator-transformer unit is isolated from the 220kV bus 12 in fault, and switches on all sides of the generator-transformer unit are disconnected, so that the generator 14 and the main transformer 13 can be safely and reliably shut down, and the risks of turbine runaway, excitation overpressure undervoltage and station service voltage loss are avoided.
Optionally, the generator-transformer group protection a/B screen 2 is connected to the generator-transformer group protection C screen 3, and the generator-transformer group protection a/B screen 2 is further configured to send a third control signal to the generator-transformer group protection C screen 3 to control the generator-transformer group protection C screen 3 to act.
In this embodiment, the generator-transformer group protection a/B screen 2 is connected to the generator-transformer group protection C screen 3 through a control cable, and the generator-transformer group protection a/B screen 2 is further configured to send a third control signal to the generator-transformer group protection C screen 3 in 0 second delay according to the first control signal sent by the bus protection screen 1, so as to control the generator-transformer group protection C screen 3 to act, thereby controlling the switch between the 220kV bus 12 and the main transformer 13 to be disconnected. It should be noted that the generator-transformer group protection C screen 3 is configured to operate according to a first control signal sent by the bus protection screen 1 and operate according to a third control signal sent by the generator-transformer group protection a/B screen 2, and control the switch between the 220kV bus 12 and the main transformer 13 to be disconnected twice, where the two controls are mutually standby, and when the switch between the 220kV bus 12 and the main transformer 13 is disconnected under the first control of the generator-transformer group protection C screen 3, no processing is performed when the second control of the generator-transformer group protection C screen 3 is received; when the switch between the 220kV bus 12 and the main transformer 13 is not successfully disconnected under the first control of the generator-transformer unit protection C screen 3, the disconnection is executed when the second control of the generator-transformer unit protection C screen 3 is received, and therefore the reliability of system operation is improved.
Optionally, each side switch of the generator-transformer group comprises a de-excitation switch 5 and a main valve 6. The field suppression switch 5 is connected with the generator-transformer group protection A/B screen 2 and is used for tripping according to the action of the generator-transformer group protection A/B screen 2 so as to cut off an excitation power supply; and the main throttle valve 6 is connected with the generator-transformer group protection A/B screen 2 and is used for closing according to the action of the generator-transformer group protection A/B screen 2 so as to disconnect the motive power of the generator.
Optionally, the switches on each side of the generator set further comprise a fast switching device 4. And the quick switching device 4 is connected with the generator-transformer group protection A/B screen 2 and is used for starting according to the action of the generator-transformer group protection A/B screen 2 so as to disconnect a factory transformer 17 (the factory transformer 17 is used for reducing the voltage generated by the generator 14 to 6kV and is used as a normal power supply of the 6kV bus 16) and a factory transformer-transformer low-voltage side switch 18 (the factory transformer-transformer low-voltage side switch 18 is in a switching-on position in a normal state) between the 6kV bus 16. It should be noted that, normally, when the generator 14 is stopped, the 6kV bus 16 is in a power-off state, at this time, the fast switching device 4 is started to disconnect the service low-voltage side switch 18 and close the standby low-voltage side switch 10, so that the 6kV bus 16 is in a charged state, thereby ensuring that each auxiliary machine of the service system can normally operate, and the generator 14 can be stopped safely. In the embodiment, the fast switching device 4 is started to disconnect the plant-used low-voltage-side switch 18, but the standby low-voltage-side switch 10 cannot be switched on, because when the 220kV bus 12 fails and the generator-transformer group and the standby transformer unit on the bus are cut off, the standby high-voltage-side switch 11 between the 220kV bus 12 and the standby transformer 15 (the standby transformer 15 for reducing the electric energy of the 220kV bus 12 or serving as a standby power supply of the 6kV bus 16) is switched off, so that the standby transformer 15 fails to switch on the standby low-voltage-side switch 10 between the standby transformer 15 and the 6kV bus 16 when the fast switching device 4 is started.
Optionally, each side switch of the generator-transformer group further comprises a main transformer high-voltage side switch 7 located between the 220kV bus and the main transformer. And the main transformer high-voltage side switch 7 is connected with the generator transformer unit protection C screen 3 and is used for disconnecting according to the action of the generator transformer unit protection C screen 3 so as to disconnect the 220kV bus 12 from the main transformer 13.
In the embodiment, when a 220kV bus 12 has a fault, the bus protection screen 1 simultaneously controls the generator-transformer unit protection A/B screen and the generator-transformer unit protection C screen to act so as to control the quick-switching device 4 to start, the de-excitation switch 5 to trip, the main throttle valve 6 to close and the main transformer high-voltage side switch 7 to disconnect in 0 second time delay, so that the generator-transformer unit is completely stopped, and the risks of turbine runaway, excitation overvoltage and undervoltage and station service voltage loss are avoided.
Optionally, the cutting system for the 220kV bus fault further includes a starting-up and standby transformer protection a/B screen 8 and a starting-up and standby transformer protection operation box 9. The starting-up transformer protection A/B screen 8 is used for controlling the disconnection of switches on each side of the starting-up transformer; the starting-up transformer protection operation box 9 is used for controlling the disconnection of a switch between a 220kV bus and a starting-up transformer; the bus protection screen 1 is further connected with the starting-standby transformer protection A/B screen 8 and the starting-standby transformer protection operation box 9 and is used for sending a second control signal to the starting-standby transformer protection A/B screen 8 and the starting-standby transformer protection operation box 9 simultaneously when a 220kV bus fails so as to trigger the actions of the starting-standby transformer protection A/B screen 8 and the starting-standby transformer protection operation box 9 and further control the transformer (starting-standby transformer) to stop completely.
In this embodiment, the bus protection panel 1 is connected to the startup and standby transformer protection a/B panel 8 and the startup and standby transformer protection operation box 9 through control cables, respectively. The bus protection screen 1 is used for sending a first control signal to the generator-transformer-group protection A/B screen 2 and the generator-transformer-group protection C screen 3 when a 220kV bus 12 has a grounding and short-circuit fault, and simultaneously sending a second control signal to the starting-up transformer-protection A/B screen 8 and the starting-up transformer-protection operation box 9. The starting-up transformer protection A/B screen 8 comprises two protection screens with the same function, operates simultaneously, is standby mutually, and is used for controlling the disconnection of switches on all sides of the starting-up transformer 15 according to a second control signal and an outlet matrix (for example, a switching value protection tripping matrix of the starting-up transformer protection A/B screen 8 is 007B full-stop starting-up transformer), and meanwhile, the starting-up transformer protection operation box 9 is used for acting according to the second control signal to control the disconnection of the switches between the 220kV bus 12 and the starting-up transformer 15. Therefore, the starting-up transformer 15 is isolated from the 220kV bus 12 in fault, and the starting-up transformer can be safely and reliably shut down. The risk of turbine runaway, excitation overpressure undervoltage and station service voltage loss is avoided, and meanwhile, the condition that the low-voltage side power supply is returned to a bus fault point due to the fact that the switch between the starting-standby transformer and the 6kV bus is disconnected, and the condition that the high-voltage side switch fails to operate due to the switch failure can be avoided.
Optionally, the starting-standby transformer protection a/B screen 8 is connected to the starting-standby transformer protection operation box 9, and the starting-standby transformer protection a/B screen 8 is further configured to send a fourth control signal to the starting-standby transformer protection operation box 9 to control the starting-standby transformer protection operation box 9 to act.
In this embodiment, the startup and standby transformer protection a/B screen 8 is connected to the startup and standby transformer protection operation box 9 through a control cable, and the startup and standby transformer protection a/B screen 8 is further configured to send a fourth control signal to the startup and standby transformer protection operation box 9 in 0 second delay according to a second control signal sent by the bus protection screen 1, so as to control the startup and standby transformer protection operation box 9 to act, thereby controlling the switch between the 220kV bus 12 and the startup and standby transformer 15 to be disconnected. It should be noted that the startup and standby transformer protection operation box 9 is configured to operate according to the second control signal sent by the bus protection panel 1 and operate according to the fourth control signal sent by the startup and standby transformer protection a/B panel 8, so that the switch between the 220kV bus 12 and the startup and standby transformer 15 is controlled to be turned off twice, where the two controls are mutually standby, and thus the reliability of the system operation is improved, and certainly, the switch between the 220kV bus 12 and the startup and standby transformer 15 may be rejected due to a switch failure.
Optionally, the side switches of the starter transformer include a starter low voltage side switch 10 and a starter high voltage side switch 11 between the 220kV bus and the starter transformer 15. The starting and standby transformer low-voltage side switch 10 is connected with the starting and standby transformer protection A/B screen 8 and used for tripping according to the action of the starting and standby transformer protection A/B screen 8 so as to disconnect the 6kV bus 16 from the starting and standby transformer 15. And the starting-up high-voltage side switch 11 is connected with the starting-up transformer protection operation box 9 and is used for disconnecting according to the action of the starting-up transformer protection operation box 9 so as to disconnect the 220kV bus 12 from the starting-up transformer 15.
In this embodiment, when the 220kV bus 12 has a fault, the startup high-voltage side switch 11 may fail due to a failure, and the startup low-voltage side switch 10 is used for being disconnected according to the action of the startup transformer protection a/B screen 8, so that the 6kV bus 16 and the startup transformer 15 are disconnected, and the risk that the low-voltage side power supply is returned to the 220kV bus fault point is avoided. It should be noted that, while the standby-to-standby protection a/B screen 8 acts to control the standby low-voltage side switch 10, the standby-to-standby protection a/B screen 8 is also used to send a latch instruction to the fast switching device 4 to prohibit the fast switching device 4 from activating the standby low-voltage side switch 10.
In the excision system during 220kV generating line trouble that this embodiment provided, the generating line protection screen for when 220kV generating line trouble, send first control signal simultaneously and give and send out a group protection A/B screen and send and become a group protection C screen, with trigger and send and become a group protection A/B screen and send and become a group protection C screen action, and then control and send and become a group and stop entirely, thereby avoid the risk of steam turbine runaway, excitation superpressure under-voltage, station service voltage loss. Further, the bus protection screen is also used for sending a second control signal to the protection A/B screen of the starting-standby transformer while sending the second control signal to the protection operation box of the starting-standby transformer so as to control the switch between the starting-standby transformer and the 6kV bus to be switched off, thereby avoiding the risks of runaway of a steam turbine, excitation overpressure and undervoltage and loss of service voltage, avoiding the switch between the starting-standby transformer and the 220kV bus from failing and failing to operate, and avoiding the condition that a low-voltage side power supply is returned to a bus fault point. Therefore, the 220kV busbar fault cutting system provided by this embodiment can improve the operation safety of the generator and the starting-up transformer, can realize the instantaneous safe and reliable switch and energy on each side of the shutdown transformer set, the transformer (starting-up transformer) unit after busbar protection action, reduce the risk of turbine runaway, excitation overpressure and undervoltage, and station service voltage loss, and reduce the risk of the low-voltage side power supply being returned to the busbar fault point.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (10)
1. A method for cutting off a 220kV bus in fault is characterized by comprising the following steps:
when a 220kV bus fails, the bus protection screen (1) simultaneously sends a first control signal to the generator-transformer group protection A/B screen (2) and the generator-transformer group protection C screen (3), and triggers the generator-transformer group protection A/B screen (2) and the generator-transformer group protection C screen (3) to act so that the generator-transformer group is completely stopped; wherein,
the generator-transformer group protection A/B screen (2) acts according to the first control signal to control the switches on all sides of the generator-transformer group to be switched off;
and the generator-transformer unit protection C screen (3) acts according to the first control signal to control the switch between the 220kV bus and the main transformer to be disconnected.
2. The method for cutting off the 220kV bus in the event of the fault is described in claim 1, further comprising:
when a 220kV bus fails, the bus protection screen (1) simultaneously sends a second control signal to the starting-standby transformer protection A/B screen (8) and the starting-standby transformer protection operation box (9), and the starting-standby transformer protection A/B screen (8) and the starting-standby transformer protection operation box (9) are triggered to act so as to stop the transformer completely; wherein,
the protection A/B screen (8) of the starting-up transformer acts according to the second control signal to control the switches on all sides of the starting-up transformer to be switched off;
and the starting-up transformer protection operation box (9) acts according to the second control signal to control the switch between the 220kV bus and the starting-up transformer to be switched off.
3. A220 kV bus fault cutting system is characterized by comprising a generator-transformer group protection A/B screen (2), a generator-transformer group protection C screen (3) and a bus protection screen (1),
the generator-transformer group protection A/B screen (2) is used for controlling the disconnection of switches on each side of the generator-transformer group;
the generator transformer group protection C screen (3) is used for controlling the disconnection of a switch between a 220kV bus and a main transformer;
the bus protection screen (1) is connected with the generator-transformer group protection A/B screen (2) and the generator-transformer group protection C screen (3) and is used for sending a first control signal to the generator-transformer group protection A/B screen (2) and the generator-transformer group protection C screen (3) when a 220kV bus fails so as to trigger the generator-transformer group protection A/B screen (2) and the generator-transformer group protection C screen (3) to act and further control the generator-transformer group to stop completely.
4. The 220kV bus fault clearing system according to claim 3, wherein the generator-transformer group protection A/B screen (2) is connected with the generator-transformer group protection C screen (3), and the generator-transformer group protection A/B screen (2) is further used for sending a third control signal to the generator-transformer group protection C screen (3) to control the generator-transformer group protection C screen (3) to act.
5. The 220kV bus fault clearing system according to claim 4, wherein each side switch of the generator-transformer group comprises a de-excitation switch (5) and a main valve (6),
the de-excitation switch (5) is connected with the generator-transformer group protection A/B screen (2) and is used for tripping according to the action of the generator-transformer group protection A/B screen (2) to disconnect an excitation power supply;
and the main throttle valve (6) is connected with the generator-transformer group protection A/B screen (2) and is used for closing according to the action of the generator-transformer group protection A/B screen (2) so as to disconnect the motive power of the generator.
6. The 220kV bus fault clearing system according to claim 5, wherein each side switch of the generator-transformer group further comprises a fast-switching device (4),
and the quick switching device (4) is connected with the generator-transformer group protection A/B screen (2) and is used for starting according to the action of the generator-transformer group protection A/B screen (2) so as to disconnect a station transformer low-voltage side switch (18) between a station transformer and a 6kV bus.
7. The 220kV bus fault clearing system according to claim 6, wherein each side switch of the generator-transformer group further comprises a main transformer high-voltage side switch (7) between the 220kV bus and the main transformer,
and the main transformer high-voltage side switch (7) is connected with the generator transformer unit protection C screen (3) and is used for disconnecting according to the action of the generator transformer unit protection C screen (3) so as to disconnect the 220kV bus from the main transformer.
8. The 220kV bus fault clearing system according to any one of claims 3-7, further comprising a backup transformer protection A/B screen (8) and a backup transformer protection operation box (9),
the protection A/B screen (8) of the starting-up transformer is used for controlling the disconnection of switches on each side of the starting-up transformer;
the starting-up transformer protection operation box (9) is used for controlling the disconnection of a switch between a 220kV bus and a starting-up transformer;
the bus protection screen (1) is further connected with the starting-standby transformer protection A/B screen (8) and the starting-standby transformer protection operation box (9) and used for sending a second control signal to the starting-standby transformer protection A/B screen (8) and the starting-standby transformer protection operation box (9) when a 220kV bus fails so as to trigger the actions of the starting-standby transformer protection A/B screen (8) and the starting-standby transformer protection operation box (9) and further control the full stop of the transformer.
9. The 220kV bus fault clearing system according to claim 8, wherein the starting-standby transformer protection A/B screen (8) is connected with the starting-standby transformer protection operation box (9), and the starting-standby transformer protection A/B screen (8) is further used for sending a fourth control signal to the starting-standby transformer protection operation box (9) to control the starting-standby transformer protection operation box (9) to act.
10. The 220kV bus fault clearing system of claim 9, wherein each side switch of the starting-up transformer comprises a starting-up low-voltage side switch (10) and a starting-up high-voltage side switch (11) between the 220kV bus and the starting-up transformer, wherein,
a starting-up and standby low-voltage side switch (10) which is connected with the starting-up and standby transformer protection A/B screen (8) and is used for tripping according to the action of the starting-up and standby transformer protection A/B screen (8) so as to disconnect the 6kV bus from the starting-up and standby transformer,
and the starting-standby high-voltage side switch (11) is connected with the starting-standby transformer protection operation box (9) and is used for disconnecting according to the action of the starting-standby transformer protection operation box (9) so as to disconnect the 220kV bus from the starting-standby transformer.
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Cited By (1)
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