CN113612305B - 10KV standby power supply automatic switching control method and device - Google Patents
10KV standby power supply automatic switching control method and device Download PDFInfo
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- CN113612305B CN113612305B CN202110730390.8A CN202110730390A CN113612305B CN 113612305 B CN113612305 B CN 113612305B CN 202110730390 A CN202110730390 A CN 202110730390A CN 113612305 B CN113612305 B CN 113612305B
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- 238000010586 diagram Methods 0.000 description 4
- 238000005266 casting Methods 0.000 description 3
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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- Emergency Management (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Stand-By Power Supply Arrangements (AREA)
Abstract
The invention relates to a 10 kilovolt standby power supply automatic switching control method which is applied to a transformer station comprising a first main transformer and a second main transformer; the control method controls the transformer substation to operate in one of the following modes: first mode: the first main transformer and the second main transformer are respectively one of a working power supply and a standby power supply in a hot standby state; executing automatic switching logic of the standby power supply when the working power supply loses voltage; second mode: the first main transformer and the second main transformer are used as working power supplies, and the first sectionalizer is in a brake separating state; and when one of the first main transformer and the second main transformer is out of voltage, executing the automatic switching-on logic of the first sectionalizer. According to the 10 kilovolt standby power supply automatic switching control method and device, the standby power supply is in the hot standby state, so that idle consumption of the standby power supply can be avoided.
Description
Technical Field
The invention relates to the technical field of automatic switching of a standby power supply of a transformer substation, in particular to a 10 kilovolt standby power supply automatic switching control method and device.
Background
Along with the continuous improvement of urban power supply reliability requirements, a 10kV (kilovolt) standby power supply automatic switching device (hereinafter referred to as a standby automatic switching device) is arranged in many substations, and the basic function of the automatic switching device is that when a main transformer (hereinafter referred to as a main transformer) of the substation trips or the voltage of a 10kV bus is lost due to the voltage loss of an upper bus, the standby automatic switching device can quickly and automatically recover the normal power supply of the 10kV bus by closing an adjacent main transformer low-voltage switch or a 10kV bus sectionalizing switch.
The traditional automatic switching device has two action modes, namely low-voltage automatic switching and sectional automatic switching, and is respectively applicable to two operation modes: (1) The low-voltage automatic switching device is suitable for one main transformer in an operation state, the other main transformer in an idle state (a high-voltage switch is in a switching-on position, a low-voltage switch is in a hot standby state), and a 10kV bus sectionalizer switch is in the operation state; (2) The sectional spare power automatic switching device is suitable for the state that two main transformers are in operation, and the 10kV bus sectional switch is in a hot standby state.
The action process of the traditional spare power automatic switching device is as follows: (1) When the low-standby automatic switching action is performed, firstly, a low-voltage switch of the running main transformer is tripped, and then the low-voltage switch of the idle main transformer is closed; (2) When the sectional spare power automatic switching action is performed, the low-voltage switch of the voltage-losing main transformer is firstly tripped, and then the 10kV bus sectional switch is closed.
The action logic of the conventional automatic backup power switching device has the following defects: (1) For the low-voltage automatic switching mode, the main transformer serving as a 10kV bus standby power supply is required to be in an idle state, and it is uneconomical to keep one main transformer in the idle state for a long time; (2) The action of the spare power automatic switching device often means that faults occur in the system, in some cases, besides the automatic switching of the 10kV spare power supply, an original working transformer variable-height switch is required to be disconnected, the traditional spare power automatic switching device only considers the switching of the spare power supply, and if the original working transformer variable-height switch is required to be disconnected, manual operation is only required to be relied on; (3) The operation mode of the 10kV system is changed after the operation of the low-voltage automatic switching or the sectional automatic switching, in general, a neutral point grounding device (small resistor or arc suppression coil) of the 10kV system needs to be switched according to the operation mode of the 10kV system, and the operation of the small resistor or arc suppression coil switch can only be carried out manually by operating the main transformer low-voltage switch and the 10kV sectional switch according to the traditional automatic switching operation logic.
Disclosure of Invention
Based on the above, it is necessary to provide a 10kv backup power automatic switching control method and device for overcoming the defects of the action logic of the conventional backup power automatic switching device.
A10 kilovolt standby power supply automatic switching control method is applied to a transformer station comprising a first main transformer and a second main transformer; the first main transformer is connected with a power transmission network through a first high-voltage switch and is connected with a first bus through a first low-voltage switch, and the first bus is connected with a first grounding transformer through a first grounding switch; the second main transformer is connected with a power transmission network through a second high-voltage change switch and is connected with a second bus through a second low-voltage change switch, and the second bus is connected with a second grounding transformer through a second grounding switch; a first sectionalizer is connected between the first bus and the second bus; the control method controls the transformer substation to operate in one of the following modes:
first mode: the first main transformer and the second main transformer are respectively one of a working power supply and a standby power supply in a hot standby state; executing automatic switching logic of the standby power supply when the working power supply loses voltage;
second mode: the first main transformer and the second main transformer are used as working power supplies, and the first sectionalizer is in a brake separating state; and when one of the first main transformer and the second main transformer is out of voltage, executing the automatic switching-on logic of the first sectionalizer.
In one embodiment, the executing the backup power automatic on logic includes:
a low-voltage switch for switching off the working power supply; after the switching-off of the low-voltage switch of the working power supply is successful, executing the high-voltage switch automatic switching of the standby power supply; and after the automatic switching of the high-voltage switch of the standby power supply is successful, the low-voltage switch of the standby power supply is closed.
In one embodiment, the executing the standby power automatic on logic further comprises:
after the switching-on of the low-voltage switch of the standby power supply is successful, 10 kilovolt neutral point switching is executed;
and after the switching of the 10 kilovolt neutral point is successful, executing the jump following of the variable-height switch of the working power supply.
In one embodiment, when any one of the off low switch of the working power supply, the high switch of the standby power supply is automatically switched on, the low switch of the standby power supply is switched on, the 10kv neutral point is switched on, and the high switch of the working power supply fails to follow the jump, the automatic switching logic of the standby power supply is ended.
In one embodiment, the executing the first sectionalizing automatic closing logic includes:
a low-voltage switch of the main transformer for switching off the voltage loss; the main transformer of the voltage loss is a first main transformer or a second main transformer, and correspondingly, the low-voltage switch is a first low-voltage switch or a second low-voltage switch;
closing the first sectionalizing switch;
performing 10 kilovolt neutral point switching;
performing a follow-up of a high-switching switch of the main transformer for voltage loss; the high-voltage changing switch is a first high-voltage changing switch or a second high-voltage changing switch of the main transformer corresponding to voltage loss.
In one embodiment, the method further comprises:
in the first mode, the condition of judging the voltage loss of the working power supply is simultaneously satisfied: the low-voltage switch of the working power supply has no current, the bus of the working power supply has no voltage, and the bus of the standby power supply has no voltage;
in the second mode, the condition of judging the voltage loss of the working power supply is simultaneously satisfied: the three-phase voltages of the buses of the two working power supplies are smaller than the constant value of no-voltage of the buses, and the three-phase current of one of the low-voltage switches is smaller than the constant value of no-current.
In one embodiment, the method further comprises:
charging the first mode when the first mode charging condition is satisfied; the first mode charging condition is that: the main function hard pressing plate and the soft pressing plate are both put into operation, the main transformer low-standby switching mode is effective, the first sectionalizing switch is switched on, the low-voltage switch of the working voltage is switched on, the low-voltage switch of the standby power supply is switched off, and the three-phase voltages of the first bus and the second bus are both larger than the voltage fixed value;
charging the second mode when the second mode charging condition is satisfied; the second mode charging condition is that: the spare power automatic switching function pressing plate is put into operation, the first low-voltage switch and the second low-voltage switch are in switching-on, the first sectionalizing switch is in switching-off, and the first bus and the second bus have voltages and are not overhauled.
In one embodiment, the 10kv neutral switching includes:
judging whether the positions of the first grounding switch and the second grounding switch are the same, if so, switching is successful; and if the switching-on of the grounding switch of the standby power supply is successful, and the switching-off of the grounding switch of the working power supply is successful, the switching-on is successful.
In one embodiment, the step-up switch comprises:
judging whether a main transformer neutral point is automatically switched on or off, if so, enabling a ground knife of a working power supply to be in a pulling-off position, switching off a variable-height switch of the working power supply, and if the switching-off of the variable-height switch of the working power supply is successful, successfully following jump;
if the main transformer neutral point automatic switching hard pressing plate and the soft pressing plate are not switched on, the variable-height switch of the working power supply is directly disconnected, and when the variable-height switch of the working power supply is successful in switching off, the follow-up jump is successful.
The 10KV standby power supply automatic switching control device comprises a memory and a processor, wherein the memory stores a computer program, and the processor realizes the steps of the method when executing the computer program.
According to the 10 kilovolt standby power supply automatic switching control method and device, the standby power supply is in the hot standby state, so that idle consumption of the standby power supply can be avoided.
Further, through automatic processing of jump following and neutral point switching of a high-voltage-loss main transformer, complete processing logic of automatic switching of a standby power supply is realized, and the problem that only a low-voltage switch and a sectionalizing switch are processed in a traditional switching mode is avoided.
Drawings
FIGS. 1 a-1 c are circuit block diagrams of the same substation (in different modes of operation) according to one embodiment;
FIG. 2 is a logic flow diagram of automatic standby power input according to an embodiment;
FIG. 3 is a flowchart of the self-switching subroutine of the second high switch 1102 in step S103 in FIG. 2;
fig. 4 is a flowchart of a 10kV neutral switching subroutine involved in step S107 in fig. 2;
fig. 5 is a flowchart showing a first step up switch 1101 and a skip subroutine involved in step S109 in fig. 2;
FIG. 6 is a block diagram of a segment self-casting logic flow according to an embodiment.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "vertical", "horizontal", "inner", "outer", etc., are based on the methods or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Fig. 1a to 1c are circuit configuration diagrams of the same substation (in different operation modes) according to an embodiment. The transformer substation comprises three main transformers: a first main transformer (# 1 main transformer), a second main transformer (# 2 main transformer), and a third main transformer (# 3 main transformer). The first main transformer (# 1 main transformer) is connected with a power transmission network through a first high-voltage switch 1101, is connected with a first bus (10 kV 1M) through a first low-voltage switch 501, and the first bus (10 kV 1M) is connected with a first grounding transformer (# 1 grounding transformer) through a first grounding switch D01. The second main transformer (# 2 main transformer) is connected with a power transmission network through a second high-voltage change switch 1102, is connected with a second bus (10 kV 2M) through a second low-voltage change switch 502, and the second bus (10 kV 2M) is connected with a second grounding transformer (# 2 grounding transformer) through a second grounding switch D02. The third main transformer is connected to a power transmission network through a third high-voltage switch 1103, is connected to a third bus bar (10 kV 3M) through a third low-voltage switch 503, and is connected to a third grounding transformer (# 3 grounding transformer) through a third grounding switch D03. A first sectional switch 521 is connected between the first bus (10 kV 1M) and the second bus (10 kV 2M), and a second sectional switch 532 is connected between the second bus (10 kV 2M) and the third bus (10 kV 3M).
The transformer substation with the circuit structure can have eight operation modes:
mode one: the first main transformer is used as a working power supply, and the second main transformer is used as a standby power supply. When the first main transformer loses voltage, the second main transformer is automatically switched. Referring to fig. 1a, the first main transformer (# 1 main transformer) is running, the second main transformer (# 2 main transformer) is hot standby, and the first sectionalizer 521 is in a closed state. Referring to fig. 1b, the first main transformer (# 1 main transformer) is running, the second main transformer (# 2 main transformer) is idling, and the first sectionalizer 521 is in a closed state.
Mode two: the second main transformer is used as a working power supply, and the first main transformer is used as a standby power supply. When the second main transformer loses voltage, the first main transformer is automatically switched.
Mode three: the third main transformer is used as a working power supply, and the second main transformer is used as a standby power supply. When the third main transformer loses voltage, the second main transformer is automatically switched.
Mode four: the second main transformer is used as a working power supply, and the third main transformer is used as a standby power supply. When the second main transformer loses voltage, the third main transformer is automatically switched.
Mode five: the first main transformer and the second main transformer are used as working power supplies, and the first sectionalizer switch is not closed. When the first main transformer loses voltage, the first sectionalizing switch is switched on and off. Referring to fig. 1c, both the first main transformer (# 1 main transformer) and the second main transformer (# 2 main transformer) are running, and the first sectionalizer 521 is on-off.
Mode six: the first main transformer and the second main transformer are used as working power supplies, and the first sectionalizer switch is not closed. When the second main transformer loses voltage, the first sectionalizing switch is switched on and off.
Mode seven: the second main transformer and the third main transformer are used as working power supplies, and the second section switch is not switched on. When the second main transformer loses voltage, the second sectionalizing switch is switched on and off.
Mode eight: the second main transformer and the third main transformer are used as working power supplies, and the second section switch is not switched on. When the third main transformer loses voltage, the first sectionalizing switch is switched on and off.
It can be understood that the operation mode is that two adjacent main transformers are mutually used as spare transformers for automatic switching or combination of sectional automatic switching. The number of transformers of the substation is not limited to three, but includes at least two. Two main transformers (a first main transformer and a second main transformer) are described below as an example.
Based on the above circuit structure, the 10kv backup power supply automatic switching control method of an embodiment can control the transformer substation to operate in one of the following modes:
first mode: the first main transformer and the second main transformer are respectively one of a working power supply and a standby power supply in a hot standby state; and when the working power supply is out of voltage, executing automatic switching logic of the standby power supply. It will be appreciated that the first mode includes the first and second modes of operation described above. Wherein, the standby power supply is in a hot standby state, that is, the high-voltage switch and the low-voltage switch of the standby power supply are both in a switching-off state. By placing the backup power supply in a hot standby state, idle consumption of the backup power supply can be avoided. In executing the standby power automatic switching logic, the standby power in the hot standby state can be switched on by automatically controlling the high switch and the low switch to be switched on.
Second mode: the first main transformer and the second main transformer are used as working power supplies, and the first sectionalizer is in a brake separating state; and when one of the first main transformer and the second main transformer is out of voltage, executing the automatic switching-on logic of the first sectionalizer. It will be appreciated that the second mode includes modes five and six of operation described above.
In one embodiment, the executing the backup power automatic on logic includes:
a low-voltage switch for switching off the working power supply; after the switching-off of the low-voltage switch of the working power supply is successful, executing the high-voltage switch automatic switching of the standby power supply; and after the automatic switching of the high-voltage switch of the standby power supply is successful, the low-voltage switch of the standby power supply is closed. It will be appreciated that the working power supply is either the first main transformer or the second main transformer and, correspondingly, the backup power supply is either the second main transformer or the first main transformer. The automatic switching of the variable-height switch of the standby power supply enables the standby power supply to enter an idle state from a hot standby state, and then the successful switching of the standby power supply can be realized after the switching-on of the variable-height switch is successful.
In one embodiment, the executing the standby power automatic on logic further comprises: after the switching-on of the low-voltage switch of the standby power supply is successful, 10 kilovolt neutral point switching is executed; and after the switching of the 10 kilovolt neutral point is successful, executing the jump following of the variable-height switch of the working power supply. The 10 kilovolt neutral point switching can enable the three-phase neutral point of the bus corresponding to the standby power supply to be correctly grounded, and normal use of the switched standby power supply is guaranteed. The high-voltage-losing main transformer is switched off by the high-voltage-changing switch of the working power supply.
In one embodiment, when any one of the off low switch of the working power supply, the high switch of the standby power supply is automatically switched on, the low switch of the standby power supply is switched on, the 10kv neutral point is switched on, and the high switch of the working power supply fails to follow the jump, the automatic switching logic of the standby power supply is ended. The above-mentioned turn-off working power supply's low-voltage switch, stand-by power supply's high-voltage switch automatic switching, stand-by power supply's low-voltage switch closing, 10 kilovolt neutral point switching and working power supply's high-voltage switch follow jump are the complete logic of stand-by power supply switching, and when any one of them failed, processing logic is incomplete, can't guarantee the normal use after the stand-by power supply switching.
Specifically, in a mode, as shown in fig. 2, the automatic standby power supply switching logic is as follows:
s101: the first low switch 501 is turned off. The main control program sends out a first low-level switch opening signal to control the first low-level switch 501 to be opened.
S102: whether the first low switch 501 is successful is determined, if so, step S103 is entered, otherwise, a fail signal of "spare power automatic switching action" is sent and the automatic switching is ended.
S103: judging whether the hard pressing plate and the soft pressing plate are both put into the second heightening switch 1102 self-switching mode, if so, entering the second heightening switch 1102 self-switching subprogram, otherwise, entering step S105.
S104: judging whether the second high switch 1102 is successful or not, if so, entering step S105, otherwise, sending a fail signal of 'spare power automatic switching action' and ending the automatic switching.
S105: the second low switch 502 is closed. The main control program sends a second low-voltage switch closing signal to control the second low-voltage switch 502 to be closed.
S106: whether the second low switch 502 is closed or not is judged, if yes, the step S107 is entered, otherwise, a fail signal of 'spare power automatic switching action' is sent out and automatic switching is ended.
S107: judging whether a hard pressing plate and a soft pressing plate are both put into the 10kV neutral point automatic switching mode, if so, entering a 10kV neutral point switching subprogram, otherwise, entering a step S109;
s108: judging whether the 10kV neutral point switching is successful, if so, entering step S109, otherwise, sending a fail signal of 'spare power automatic switching action' and ending the automatic switching;
s109: judging whether the hard pressing plate and the soft pressing plate of the main variable high switch follow-up jump are both put into operation, if so, entering a first high switch 1101 follow-up jump subroutine, otherwise, ending the automatic casting.
S110: whether the first high switch 1101 is successful in following the jump is judged, if so, the automatic switching is finished, and if not, a fail signal of 'standby automatic switching action' is sent and the automatic switching is finished.
Specifically, as shown in fig. 3, the second step-up switch 1102 self-switching subroutine involved in step S103 includes the steps of:
s201: judging whether the second high-changing switch 1102 is at a closing position, if the second high-changing switch 1102 is at the closing position, the second high-changing switch 1102 automatically switches on successfully, otherwise, the step S202 is entered;
s202: judging whether a hard pressing plate and a soft pressing plate are both put into the main transformer neutral point automatic switching mode, if so, entering a step S203, otherwise, entering a step S205;
s203: closing the second ground knife 112000;
s204: judging whether the second ground knife 112000 is closed, if so, entering the next step, otherwise, failing the self-switching of the second heightening switch 1102;
s205: closing the second heightening switch 1102;
s206: judging whether the second high-voltage switch 1102 is switched on, if so, the second high-voltage switch 1102 is switched on successfully, otherwise, the second high-voltage switch 1102 is switched on successfully;
in one embodiment, the 10kv neutral switching includes:
judging whether the positions of the first grounding switch and the second grounding switch are the same, if so, switching is successful; and if the switching-on of the grounding switch of the standby power supply is successful, and the switching-off of the grounding switch of the working power supply is successful, the switching-on is successful.
Specifically, as shown in fig. 4, the 10kV neutral point switching subroutine involved in step S107 includes the steps of:
s301: judging whether the positions of the first grounding switch D01 and the second grounding switch D02 are the same, if so, switching into work, otherwise, entering step S302;
s302: judging whether the first grounding switch D01 is switched on and the second grounding switch D02 is switched off, if so, entering step S303, otherwise, entering step S307;
s303: closing the second grounding switch D02;
s304: judging whether the second grounding switch D02 is closed or not, if so, entering a step S305, otherwise, failing to switch;
s305: opening the first grounding switch D01;
s306: judging whether the first grounding switch D01 is disconnected, if yes, switching is successful, otherwise, switching fails;
s307: closing the first grounding switch D01;
s308: judging whether the first grounding switch D01 is switched on, if so, entering a step S309, otherwise, failing to switch on or off;
s309: opening the second grounding switch D02;
s310: judging whether the second grounding switch D02 is disconnected, if yes, switching is successful, and if not, switching fails.
In one embodiment, the step-up switch comprises:
judging whether a main transformer neutral point is automatically switched on or off, if so, enabling a ground knife of a working power supply to be in a pulling-off position, switching off a variable-height switch of the working power supply, and if the switching-off of the variable-height switch of the working power supply is successful, successfully following jump;
if the main transformer neutral point automatic switching hard pressing plate and the soft pressing plate are not switched on, the variable-height switch of the working power supply is directly disconnected, and when the variable-height switch of the working power supply is successful in switching off, the follow-up jump is successful.
Specifically, as shown in fig. 5, the first high switch 1101 and the skip subroutine involved in step S109 include the steps of:
step S401: judging whether a hard pressing plate and a soft pressing plate are both put into the main transformer neutral point automatic switching mode, if so, entering a step S402, otherwise, entering a step S415;
step S402: judging whether the first land cutter 111000 is closed, if so, proceeding to step S403, otherwise proceeding to step S407;
step S403: opening the first high switch 1101;
step S404: judging whether the first heightening switch 1101 is at the opening position, if so, proceeding to step S405, and failing to follow the jump;
step S405: pulling the first ground knife 111000 apart;
step S406: judging whether the first ground knife 111000 is at a pull-off position, if so, successfully performing heel-jump, otherwise, failing to perform heel-jump;
step S407: closing the first ground knife 111000;
step S408: judging whether the first ground knife 111000 is at the closing position, if so, entering step S409, otherwise, failing to follow the jump;
step S409: opening the first high switch 1101;
step S410: judging whether the first heightening switch 1101 is at the opening position, if so, proceeding to step S411, otherwise, failing to follow the jump;
step S411: pulling the first ground knife 111000 apart;
step S412: judging whether the first ground knife 111000 is at the pulling-out position, if so, entering step S413, otherwise, failing to follow the jump;
step S413: pulling the second ground knife 112000 open;
step S414: judging whether the second ground knife 112000 is at the pulling-out position, if so, successfully performing heel-jump, otherwise, failing to perform heel-jump;
step S415: opening the first high switch 1101;
step S416: it is determined whether the first high switch 1101 is in the open position, if so, the skip is successful, otherwise the skip is failed.
In one embodiment, the executing the first sectionalizing automatic closing logic includes:
a low-voltage switch of the main transformer for switching off the voltage loss; the main transformer of the voltage loss is a first main transformer or a second main transformer, and correspondingly, the low-voltage switch is a first low-voltage switch or a second low-voltage switch; closing the first sectionalizing switch; performing 10 kilovolt neutral point switching; performing a follow-up of a high-switching switch of the main transformer for voltage loss; the high-voltage changing switch is a first high-voltage changing switch or a second high-voltage changing switch of the main transformer corresponding to voltage loss. The 10 kilovolt neutral point switching can enable the bus three-phase neutral point corresponding to the main transformer without voltage to be correctly grounded, and normal use after sectional switching is ensured. The step-up switch of the main transformer is followed by the jump to switch off the step-up switch of the main transformer.
As shown in fig. 6, in the fifth operation mode, the segment automatic switching logic includes the following steps:
s501: the first low switch 501 is turned off.
S502: whether the first low switch 501 is at the opening position is determined, if yes, step S503 is entered, otherwise, a fail signal of "standby power automatic switching" is sent and the automatic switching is ended.
S503: the switch 521 is closed.
S504: whether the switch 521 is at the closing position is judged, if yes, the step S505 is entered, otherwise, a fail signal of "spare power automatic switching action" is sent, and the automatic switching is ended.
S505: judging whether the hard pressing plate and the soft pressing plate are both put into the 10kV neutral point automatic switching mode, if so, entering a 10kV neutral point switching subprogram, otherwise, entering a step S507.
S506: judging whether the 10kV neutral point switching is successful, if the switching is successful, entering step S507, otherwise, sending a fail signal of 'spare power automatic switching action' and ending the automatic switching.
S507: judging whether the hard pressing plate and the soft pressing plate of the main variable high switch follow-up jump are both put into operation, if so, entering a first high switch 1101 follow-up jump subroutine, otherwise, ending the automatic casting.
S508: whether the first high switch 1101 is successful in following the jump is judged, if so, the automatic switching is finished, and if not, a fail signal of 'standby automatic switching action' is sent and the automatic switching is finished.
The 10kV neutral point switching subroutine according to step S505 and the first high-voltage switch 1101 according to step S07 are basically identical to the flowcharts of fig. 4 and 5, respectively.
In one embodiment, the method further comprises:
in the first mode, the condition of judging the voltage loss of the working power supply is simultaneously satisfied: the low-voltage switch of the working power supply has no current, the bus of the working power supply has no voltage, and the bus of the standby power supply has no voltage. Namely:
1) The first low-switch 501 is not flowing;
2) The first bus is 10kV1M pressureless;
3) The second busbar is 10kV2M pressureless.
In the second mode, the condition of judging the voltage loss of the working power supply is simultaneously satisfied: the three-phase voltages of the buses of the two working power supplies are smaller than the constant value of no-voltage of the buses, and the three-phase current of one of the low-voltage switches is smaller than the constant value of no-current. Namely:
1) The three-phase voltage of the first bus 10kV1M and the second bus 10kV2M is smaller than the bus non-voltage fixed value Uwy;
2) The first low-switch 501 has three phase currents that are all less than the no-current value Ity.
In one embodiment, the method further comprises:
charging the first mode when the first mode charging condition is satisfied; the first mode charging condition is that: the main function hard pressing plate and the soft pressing plate are both put into operation, the main transformer low-standby switching mode is effective, the first sectionalizing switch is switched on, the low-voltage switch of the working voltage is switched on, the low-voltage switch of the standby power supply is switched off, and the three-phase voltages of the first bus and the second bus are both larger than the voltage fixed value. Namely:
1) The total functions of the hard pressing plate (1 FLP 1) and the soft pressing plate (YF_ZGN) are input;
2) The main transformer low standby mode control word (KBD) is set to be 1;
3) The first sectional switch 521 is in closing;
4) The first low-voltage switch 501 is switched on, and the second low-voltage switch 502 is switched off;
5) The voltage of the three phases of the first bus 10kV1M and the second bus 10kV2M is larger than the voltage fixed value (Uyy).
Charging the second mode when the second mode charging condition is satisfied; the second mode charging condition is that: the spare power automatic switching function pressing plate is put into operation, the first low-voltage switch and the second low-voltage switch are in switching-on, the first sectionalizing switch is in switching-off, and the first bus and the second bus have voltages and are not overhauled. Namely:
1) Inputting a spare power automatic switching function pressing plate;
2) The first low switch 501 is in the closed position;
3) The second low switch 502 is in the closed position;
4) The first sectional switch 521 is at the opening position;
5) The first bus 10kV1M is pressurized and is not overhauled;
6) The second busbar 10kV2M was pressurized and not serviced.
In one embodiment, the method further comprises:
discharging for the first mode when the first mode discharging condition is satisfied; the first mode discharge condition is one of the following conditions:
1) Exiting the "general function hard platen";
2) Exiting the total function soft pressing plate;
3) The second low switch 502 is in the closed position;
4) The three phases of the first bus 10kV1M or the second bus 10kV2M are smaller than the bus non-voltage fixed value (Uwy), but the first low-voltage switch 501 or the second low-voltage switch 502 has current;
5) In the non-start state, the on-off position signal of the first low switch 501 is changed from 1 to 0;
6) Receiving an security action blocking signal or an external blocking signal;
7) The first low-voltage switch 501, the second low-voltage switch 502, the first bus 10kV1M or the second bus 10kV2M overhaul hard pressing plate are put into.
Discharging for the second mode when the second mode discharging condition is satisfied; the second mode discharge condition is one of the following conditions:
1) Under the condition that the starting condition is not met, the first bus 10kV1M or the second bus 10kV2M is not pressurized;
2) Overhauling 10kV1M of the first bus or 10kV2M of the second bus;
3) The first section switch 521 is overhauled or in the closed position;
4) A first low switch 501 or a second low switch 502 hand-skip signal is received;
5) A backup protection action of the main transformer #1 or the main transformer # 2;
6) And the spare power automatic switching function pressing plate exits.
It can be understood that, based on the above embodiments, the operation logic of the third, fourth, seventh and eighth modes can be obtained, which is not described in detail.
In one embodiment, a 10kv backup power automatic switching control device is provided, including a memory and a processor, where the memory stores a computer program, and the processor implements the steps of the method when executing the computer program.
According to the 10 kilovolt standby power supply automatic switching control method and device, the standby power supply is in the hot standby state, so that idle consumption of the standby power supply can be avoided.
Further, through automatic processing of jump following and neutral point switching of a high-voltage-loss main transformer, complete processing logic of automatic switching of a standby power supply is realized, and the problem that only a low-voltage switch and a sectionalizing switch are processed in a traditional switching mode is avoided.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (9)
1. A10 kilovolt standby power supply automatic switching control method is applied to a transformer station comprising a first main transformer and a second main transformer; the first main transformer is connected with a power transmission network through a first high-voltage switch and is connected with a first bus through a first low-voltage switch, and the first bus is connected with a first grounding transformer through a first grounding switch; the second main transformer is connected with a power transmission network through a second high-voltage change switch and is connected with a second bus through a second low-voltage change switch, and the second bus is connected with a second grounding transformer through a second grounding switch; a first sectionalizer is connected between the first bus and the second bus; the control method is characterized in that the control method controls the transformer substation to operate in one of the following modes:
first mode: the first main transformer and the second main transformer are respectively one of a working power supply and a standby power supply in a hot standby state, wherein the hot standby state refers to a state that a high-voltage switch and a low-voltage switch of the standby power supply are both in a switching-off state; executing automatic switching logic of the standby power supply when the working power supply loses voltage;
second mode: the first main transformer and the second main transformer are used as working power supplies, and the first sectionalizer is in a brake separating state; when one of the first main transformer and the second main transformer loses voltage, executing a first sectionalizing switch automatic closing logic;
wherein, the executing the standby power automatic switching logic includes:
a low-voltage switch for switching off the working power supply;
after the switching-off of the low-voltage switch of the working power supply is successful, executing the high-voltage switch automatic switching of the standby power supply;
judging whether the high-switching automatic switching hard pressing plate and the soft pressing plate of the standby power supply are both switched on, and entering a high-switching automatic switching subprogram of the standby power supply if the high-switching automatic switching hard pressing plate and the soft pressing plate are switched on;
after the automatic switching of the high-voltage switch of the standby power supply is successful, the low-voltage switch of the standby power supply is closed;
after the switching-on of the low-voltage switch of the standby power supply is successful, 10 kilovolt neutral point switching is executed;
after the switching of the 10 kilovolt neutral point is successful, executing the jump following of a variable-height switch of the working power supply;
the automatic switching sub-process of the variable-height switch of the standby power supply comprises the following steps:
judging whether the main transformer neutral point automatic switching hard pressing plate and the soft pressing plate are both switched on or not, if so, switching on a variable-height switch grounding knife of the standby power supply;
after the switching-on of the high-voltage switch ground knife of the standby power supply is successful, the high-voltage switch of the standby power supply is switched on;
wherein, the jump following of the height-changing switch includes:
judging whether a main transformer neutral point is automatically switched on or off, if so, enabling a ground knife of a working power supply to be in a pulling-off position, switching off a variable-height switch of the working power supply, and if the switching-off of the variable-height switch of the working power supply is successful, successfully following jump;
if the main transformer neutral point automatic switching hard pressing plate and the soft pressing plate are not switched on, the variable-height switch of the working power supply is directly disconnected, and when the variable-height switch of the working power supply is successful in switching off, the follow-up jump is successful;
and when any one of the low-voltage switch of the working power supply, the high-voltage switch of the standby power supply is automatically switched on, the low-voltage switch of the standby power supply is switched on, the 10 kilovolt neutral point is switched on and the high-voltage switch of the working power supply fails to follow the jump, ending the automatic switching-on logic of the standby power supply.
2. The 10kv backup power automatic switching control method of claim 1, wherein executing the first sectionalizer automatic switching-on logic comprises:
a low-voltage switch of the main transformer for switching off the voltage loss; the main transformer of the voltage loss is a first main transformer or a second main transformer, and correspondingly, the low-voltage switch is a first low-voltage switch or a second low-voltage switch;
closing the first sectionalizing switch;
performing 10 kilovolt neutral point switching;
performing a follow-up of a high-switching switch of the main transformer for voltage loss; the high-voltage changing switch is a first high-voltage changing switch or a second high-voltage changing switch of the main transformer corresponding to voltage loss.
3. The 10kv backup power automatic switching control method of claim 1, further comprising:
in the first mode, the condition of judging the voltage loss of the working power supply is simultaneously satisfied: the low-voltage switch of the working power supply has no current, the bus of the working power supply has no voltage, and the bus of the standby power supply has no voltage;
in the second mode, the condition of judging the voltage loss of the working power supply is simultaneously satisfied: the three-phase voltages of the buses of the two working power supplies are smaller than the constant value of no-voltage of the buses, and the three-phase current of one of the low-voltage switches is smaller than the constant value of no-current.
4. The 10kv backup power automatic switching control method of claim 1, further comprising:
charging the first mode when the first mode charging condition is satisfied; the first mode charging condition is that: the main function hard pressing plate and the soft pressing plate are both put into operation, the main transformer low-standby switching mode is effective, the first sectionalizing switch is switched on, the low-voltage switch of the working voltage is switched on, the low-voltage switch of the standby power supply is switched off, and the three-phase voltages of the first bus and the second bus are both larger than the voltage fixed value;
charging the second mode when the second mode charging condition is satisfied; the second mode charging condition is that: the spare power automatic switching function pressing plate is put into operation, the first low-voltage switch and the second low-voltage switch are in switching-on, the first sectionalizing switch is in switching-off, and the first bus and the second bus have voltages and are not overhauled.
5. The 10kv backup power supply automatic switching control method according to claim 2 or 4, wherein the 10kv neutral point switching includes:
judging whether the positions of the first grounding switch and the second grounding switch are the same, if so, switching is successful; and if the switching-on of the grounding switch of the standby power supply is successful, and the switching-off of the grounding switch of the working power supply is successful, the switching-on is successful.
6. The 10kv backup power automatic switching control method of claim 1, further comprising:
discharging for the first mode when the first mode discharging condition is satisfied; the first mode discharge condition includes: the total functional hard platen and the total soft platen are withdrawn.
7. The method of claim 6, wherein the first mode discharge condition further comprises receiving an safe operation blocking signal or an external blocking signal.
8. The 10kv backup power supply automatic switching control method of claim 6, wherein the first mode discharge condition further comprises a first low switch, a second low switch, a first bus bar, or a second bus bar service hard platen input.
9. A 10kv backup power supply automatic switching control device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any of claims 1 to 8 when executing the computer program.
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