CN113612305A - 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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- CN113612305A CN113612305A CN202110730390.8A CN202110730390A CN113612305A CN 113612305 A CN113612305 A CN 113612305A CN 202110730390 A CN202110730390 A CN 202110730390A CN 113612305 A CN113612305 A CN 113612305A
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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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- Stand-By Power Supply Arrangements (AREA)
Abstract
The invention relates to a 10KV standby power supply automatic switching control method, which is applied to a transformer substation comprising a first main transformer and a second main transformer; the control method controls the substation to operate in one of the following modes: in the 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; when the working power supply is in voltage loss, executing the automatic switching logic of the standby power supply; in the second mode: the first main transformer and the second main transformer are both used as working power supplies, and the first section switch is in open brake; and when one of the first main transformer and the second main transformer loses voltage, executing the automatic closing logic of the first section switch. According to the method and the device for controlling the automatic switching of the 10kV standby power supply, the standby power supply is in a hot standby state, so that the 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 method and a device for controlling automatic switching of a 10kV standby power supply.
Background
With the continuous improvement of the requirement on the reliability of urban power supply, a plurality of transformer substations are provided with 10kV (kilovolt) standby power supply automatic switching devices (hereinafter referred to as spare automatic switching devices for short), and the spare automatic switching devices have the basic function that when a main transformer (hereinafter referred to as main transformer) of the transformer substation trips in a fault mode or a 10kV bus is subjected to voltage loss due to voltage loss of a superior bus, the spare automatic switching devices can quickly and automatically recover the normal power supply of the 10kV bus by switching on an adjacent main transformer variable-low switch or a 10kV bus sectional switch.
The traditional automatic backup power switching device has two action modes, namely a low-level automatic backup power switching mode and a sectional automatic backup power switching mode, and is respectively suitable for the two operation modes: (1) the backup power automatic switching device with the variable height is suitable for one main transformer in an operating state, the other main transformer is in an idle state (the variable height switch is in a switching-on position, and the variable height switch is in a hot standby state), and the 10kV bus section switch is in an operating state; (2) the sectionalized spare power automatic switching device is suitable for two main transformers in an operating state, and a 10kV bus sectionalizing switch is in a hot standby state.
The traditional spare power automatic switching device has the following action process: (1) when the spare power automatic switching device becomes low, firstly, a low-voltage switch of the running main transformer is tripped, and then a low-voltage switch of the no-load main transformer is switched on; (2) when the sectional spare power automatic switching device acts, firstly, a low-voltage switch of a voltage-loss main transformer is tripped off, and then a 10kV bus sectional switch is closed.
The conventional backup power automatic switching device has the following defects in action logic: (1) for the variable-height spare power automatic switching mode, a main transformer serving as a 10kV bus standby power supply is required to be in an idle state, and it is not economical to keep one main transformer in the idle state for a long time; (2) the action of the automatic backup power switching device usually means that a fault occurs in a system, in some cases, besides the automatic switching of a 10kV standby power supply, the original working transformer high-voltage switch also needs to be disconnected, the traditional automatic backup power switching device only considers the switching of the standby power supply, and if the original working main transformer high-voltage switch needs to be disconnected, the manual operation can be only relied on; (3) no matter the spare power automatic switching is changed or the sectional spare power automatic switching is changed, the operation mode of the 10kV system is changed after the operation, generally, a neutral point grounding device (a small resistor or an arc suppression coil) of the 10kV system needs to be switched according to the operation mode of the 10kV system, the traditional spare power automatic switching operation logic only operates on a main transformer change-over switch and a 10kV sectional switch, and the operation on the small resistor or the arc suppression coil switch can only be manually performed.
Disclosure of Invention
Therefore, it is necessary to provide a method and a device for controlling the automatic switching of the 10kv standby power supply, aiming at the defects of the action logic of the conventional automatic switching device.
A10 KV standby power supply automatic switching control method is applied to a transformer substation comprising a first main transformer and a second main transformer; the first main transformer is connected with the 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 the power transmission network through a second high-voltage switch, and is connected with a second bus through a second low-voltage switch, and the second bus is connected with a second grounding transformer through a second grounding switch; a first section switch is connected between the first bus and the second bus; the control method controls the substation to operate in one of the following modes:
in the 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; when the working power supply is in voltage loss, executing the automatic switching logic of the standby power supply;
in the second mode: the first main transformer and the second main transformer are both used as working power supplies, and the first section switch is in open brake; and when one of the first main transformer and the second main transformer loses voltage, executing the automatic closing logic of the first section switch.
In one embodiment, the executing the backup power automatic commissioning logic comprises:
a low-going switch for disconnecting the operating power supply; after the low-level switch of the working power supply is successfully switched off, the high-level switch of the standby power supply is automatically switched on; and after the high-level switch of the standby power supply is switched on, the low-level switch of the standby power supply is switched on.
In one embodiment, the executing the backup power automatic commissioning logic further comprises:
after the low-voltage switch of the standby power supply is successfully switched on, 10kV neutral point switching is executed;
and after the switching of the 10kV neutral point is successful, executing the following jump of the high-voltage switch of the working power supply.
In one embodiment, the standby power automatic switching logic is ended when any one of the disconnecting of the low-level switch of the working power supply, the self-switching of the high-level switch of the standby power supply, the closing of the low-level switch of the standby power supply, the switching of the 10kv neutral point and the follow-jump of the high-level switch of the working power supply fails.
In one embodiment, the executing the first section switch auto-close logic includes:
disconnecting a low-level switch of the main transformer with voltage loss; the main transformer with voltage loss is a first main transformer or a second main transformer, and correspondingly, the low-level switch is a first low-level switch or a second low-level switch;
closing the first section switch;
switching 10kV neutral points;
executing the follow-jump of a high-level switch of the main transformer with voltage loss; the high-level switch is a first high-level switch or a second high-level switch of a main transformer corresponding to voltage loss.
In one embodiment, the method further comprises:
in a first mode, the condition of judging the voltage loss of the working power supply is that: the low-level 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;
and in a second mode, judging that the condition of the working power supply voltage loss meets the following conditions at the same time: the three-phase voltage of the buses of the two working power supplies is smaller than the non-voltage fixed value of the buses, and the three-phase current of one of the low-voltage switches is smaller than the non-current fixed value.
In one embodiment, the method further comprises:
when the first mode charging condition is met, charging the first mode; the first mode charging condition is satisfied simultaneously: the main function hard pressure plate and the soft pressure plate are both put into operation, the main transformer-variable standby switching mode is effective, the first section switch is in switching-on, the working voltage variable switch is in switching-on, the standby power supply variable switch is in switching-off, and the three-phase voltages of the first bus and the second bus are all greater than a fixed value;
when the second mode charging condition is met, charging the second mode; the second mode charging condition is simultaneously satisfied: the spare power automatic switching function pressing plate is switched on, the first low-voltage switch and the second low-voltage switch are switched on, the first section switch is switched off, and the first bus and the second bus have voltage and are not overhauled.
In one embodiment, the 10kv neutral switching comprises:
judging whether the positions of the first grounding switch and the second grounding switch are the same, if so, switching is successful; otherwise, the grounding switch of the standby power supply is switched on, the grounding switch of the working power supply is switched off, and when the grounding switch of the standby power supply is successfully switched on and the grounding switch of the working power supply is successfully switched off, the switching is successful.
In one embodiment, the step-up of the high-going switch comprises:
judging whether a hard pressure plate and a soft pressure plate are put into the automatic switching of the neutral point of the main transformer, if so, enabling a grounding switch of the working power supply to be in a pulling-open position, and separating a high-voltage switch of the working power supply, wherein when the high-voltage switch of the working power supply is successfully separated, the following jump is successful;
if the main transformer neutral point automatic switching hard pressure plate and the soft pressure plate are not switched, the height-changing switch of the working power supply is directly switched off, and when the height-changing switch of the working power supply is successfully switched off, the following 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 method and the device for controlling the automatic switching of the 10kV standby power supply, the standby power supply is in a hot standby state, so that the idle consumption of the standby power supply can be avoided.
Furthermore, by automatically processing the follow-jump of the variable-height switch of the voltage-loss main transformer and the switching of the neutral point, the complete processing logic of the automatic switching of the standby power supply is realized, and the problem that only the variable-height switch and the section switch are processed in the traditional switching mode is solved.
Drawings
Fig. 1a to 1c are circuit structure diagrams of the same substation (in different operation modes) according to an embodiment;
FIG. 2 is a flow chart of an embodiment of an automatic standby power on logic;
FIG. 3 is a flowchart of the second go high switch 1102 self-throw subroutine involved in step S103 of FIG. 2;
fig. 4 is a flowchart of the 10kV neutral point switching subroutine involved in step S107 in fig. 2;
FIG. 5 is a flowchart of the first high-going switch 1101 and the skip routine involved in step S109 in FIG. 2;
FIG. 6 is a flow diagram of the segmented auto-cast logic of an embodiment.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying 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 in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on methods or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements 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), a second main transformer (#2 main) and a third main transformer (#3 main). The first main transformer (#1 main transformer) is connected to the transmission network via a first up switch 1101, and to a first bus (10kV1M) via a first down switch 501, and the first bus (10kV1M) is connected to a first grounding transformer (#1 ground) via a first grounding switch D01. The second main transformer (#2 main transformer) is connected to the transmission network via a second up switch 1102, and to a second bus (10kV2M) via a second down switch 502, and the second bus (10kV2M) is connected to a second grounding transformer (#2 ground) via a second grounding switch D02. The third main transformer is connected to the transmission network via a third high-up switch 1103, to a third bus (10kV3M) via a third low-up switch 503, and the third bus (10kV3M) is connected to a third grounding transformer (#3 ground) via a third grounding switch D03. A first section switch 521 is connected between the first bus (10kV1M) and the second bus (10kV2M), and a second section switch 532 is connected between the second bus (10kV2M) and the third bus (10kV 3M).
The transformer substation with the circuit structure can have eight operation modes:
the first method is as follows: 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, a first main transformer (#1 main) is in operation, a second main transformer (#2 main) is in hot standby, and a first section switch 521 is in a closed state. Referring to fig. 1b, the first main transformer (#1 main) is in operation, the second main transformer (#2 main) is idling, and the first section switch 521 is in a closed state.
The second method comprises the following steps: 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.
The third method comprises the following steps: 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.
The method is as follows: 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.
The fifth mode is as follows: the first main transformer and the second main transformer are both used as working power supplies, and the first section switch is not switched on. When the first main transformer loses voltage, the first section switch is switched. Referring to fig. 1c, both the first main transformer (#1 main) and the second main transformer (#2 main) are in operation, with the first section switch 521 being open.
The method six: the first main transformer and the second main transformer are both used as working power supplies, and the first section switch is not switched on. When the second main transformer loses voltage, the first section switch is switched.
The method is as follows: the second main transformer and the third main transformer are both used as working power supplies, and the second section switch is not switched on. And when the second main transformer loses voltage, the second section switch is switched.
The method eight: the second main transformer and the third main transformer are both used as working power supplies, and the second section switch is not switched on. When the third main transformer loses voltage, the first section switch is switched.
It can be understood that the above-mentioned operation mode is a combination of that two adjacent main transformers are self-switched or sectionally self-switched as standby transformers. 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 explained as an example.
Based on the circuit structure, the 10kv standby power source automatic switching control method of the embodiment can control the substation to operate in one of the following modes:
in the 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 loses voltage, executing the 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. The standby power supply is in a hot standby state, namely, the high-level switch and the low-level switch of the standby power supply are in an open 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 into use by automatically controlling the high-level switch and the low-level switch to be switched on.
In the second mode: the first main transformer and the second main transformer are both used as working power supplies, and the first section switch is in open brake; and when one of the first main transformer and the second main transformer loses voltage, executing the automatic closing logic of the first section switch. It will be appreciated that the second mode includes the fifth and sixth modes of operation described above.
In one embodiment, the executing the backup power automatic commissioning logic comprises:
a low-going switch for disconnecting the operating power supply; after the low-level switch of the working power supply is successfully switched off, the high-level switch of the standby power supply is automatically switched on; and after the high-level switch of the standby power supply is switched on, the low-level switch of the standby power supply is switched on. It will be appreciated that the working power supply is the first main transformer or the second main transformer and correspondingly the backup power supply is the second main transformer or the first main transformer. The automatic switching of the high-level 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 low-level switch is successfully switched on.
In one embodiment, the executing the backup power automatic commissioning logic further comprises: after the low-voltage switch of the standby power supply is successfully switched on, 10kV neutral point switching is executed; and after the switching of the 10kV neutral point is successful, executing the following jump of the high-voltage switch of the working power supply. The 10kV neutral point switching can ensure that the three-phase neutral point of the bus corresponding to the standby power supply is correctly grounded, and the normal use of the switched standby power supply is ensured. And the high-voltage switch of the working power supply is switched off along with the high-voltage switch of the main transformer which is subjected to voltage loss through tripping.
In one embodiment, the standby power automatic switching logic is ended when any one of the disconnecting of the low-level switch of the working power supply, the self-switching of the high-level switch of the standby power supply, the closing of the low-level switch of the standby power supply, the switching of the 10kv neutral point and the follow-jump of the high-level switch of the working power supply fails. The disconnecting of the low-level switch of the working power supply, the automatic switching of the high-level switch of the standby power supply, the closing of the low-level switch of the standby power supply, the switching of the 10-kilovolt neutral point and the follow-up tripping of the high-level switch of the working power supply are complete logics for switching the standby power supply, and when any one of the logics fails, the processing logic is incomplete, so that the normal use of the switched standby power supply cannot be guaranteed.
Specifically, in this manner, as shown in fig. 2, the standby power automatic switching logic is as follows:
s101: the first low going switch 501 is opened. The main control program sends out a first low-level switch opening signal to control to open the first low-level switch 501.
S102: and judging whether the first low-level switch 501 is successfully switched off, if so, entering the step S103, otherwise, sending a spare power automatic switching action failure signal and finishing the automatic switching.
S103: and judging whether the hard pressing plate and the soft pressing plate are both switched on or not, if so, entering a self-switching subprogram of the second high-voltage switch 1102, and otherwise, entering the step S105.
S104: and judging whether the automatic switching of the second high-voltage switch 1102 is successful, if so, entering the step S105, otherwise, sending a spare automatic switching action failure signal and finishing the automatic switching.
S105: second low switch 502 is closed. The main control program sends a second low-level switch closing signal to control the second low-level switch 502 to be closed.
S106: and judging whether the second low-voltage switch 502 is switched on or not, if so, entering the step S107, and otherwise, sending a 'spare power automatic switching action' failure signal and finishing the automatic switching.
S107: judging whether a hard pressure plate and a soft pressure plate of '10 kV neutral point automatic switching' are both put into operation, if so, entering a 10kV neutral point switching subprogram, otherwise, entering a step S109;
s108: judging whether the switching of the 10kV neutral point is successful, if so, entering the step S109, otherwise, sending a failure signal of spare power automatic switching action and finishing the automatic switching;
s109: and judging whether the hard pressing plate and the soft pressing plate are both switched, if so, entering a first variable-height switch 1101 jump sub-program, and otherwise, finishing the automatic switching.
S110: and judging whether the follow-jump of the first high-level switch 1101 is successful, if so, finishing the automatic switching, otherwise, sending a 'spare automatic switching action' failure signal and finishing the automatic switching.
Specifically, as shown in fig. 3, the second high-up switch 1102 auto-casting subroutine involved in step S103 includes the steps of:
s201: judging whether the second high-voltage switch 1102 is in a switching-on position, if the second high-voltage switch 1102 is in the switching-on position, the second high-voltage switch 1102 is switched on by itself, otherwise, the step S202 is executed;
s202: judging whether a hard pressure plate and a soft pressure plate are both put into the automatic switching of the neutral point of the main transformer, if so, entering a step S203, otherwise, entering a step S205;
s203: closing the second subterranean knife 112000;
s204: judging whether the second ground knife 112000 is closed, if so, entering the next step, otherwise, the second high-voltage switch 1102 fails to automatically switch;
s205: close the second high switch 1102;
s206: judging whether the second high-voltage switch 1102 is switched on, if so, enabling the second high-voltage switch 1102 to automatically switch on successfully, otherwise, enabling the second high-voltage switch 1102 to automatically switch on unsuccessfully;
in one embodiment, the 10kv neutral switching comprises:
judging whether the positions of the first grounding switch and the second grounding switch are the same, if so, switching is successful; otherwise, the grounding switch of the standby power supply is switched on, the grounding switch of the working power supply is switched off, and when the grounding switch of the standby power supply is successfully switched on and the grounding switch of the working power supply is successfully switched off, the switching is successful.
Specifically, as shown in fig. 4, the 10kV neutral point switching subroutine involved in step S107 includes the following steps:
s301: judging whether the positions of the first grounding switch D01 and the second grounding switch D02 are the same, if so, switching is successful, otherwise, entering the 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 the step S303, otherwise, entering the step S307;
s303: closing the second grounding switch D02;
s304: judging whether a second grounding switch D02 is switched on, if so, entering the step S305, otherwise, failing to switch;
s305: opening the first grounding switch D01;
s306: judging whether the first grounding switch D01 is switched off, if so, switching is successful, otherwise, switching is failed;
s307: closing the first grounding switch D01;
s308: judging whether the first grounding switch D01 is switched on, if so, entering the step S309, otherwise, failing to switch;
s309: opening the second grounding switch D02;
s310: and judging whether the second grounding switch D02 is switched off, if so, switching is successful, and otherwise, switching is failed.
In one embodiment, the step-up of the high-going switch comprises:
judging whether a hard pressure plate and a soft pressure plate are put into the automatic switching of the neutral point of the main transformer, if so, enabling a grounding switch of the working power supply to be in a pulling-open position, and separating a high-voltage switch of the working power supply, wherein when the high-voltage switch of the working power supply is successfully separated, the following jump is successful;
if the main transformer neutral point automatic switching hard pressure plate and the soft pressure plate are not switched, the height-changing switch of the working power supply is directly switched off, and when the height-changing switch of the working power supply is successfully switched off, the following jump is successful.
Specifically, as shown in fig. 5, the first high-up switch 1101 and the skip subroutine involved in step S109 includes the following steps:
step S401: judging whether a hard pressure plate and a soft pressure plate are both put into the automatic switching of the neutral point of the main transformer, if so, entering a step S402, otherwise, entering a step S415;
step S402: judging whether the first ground knife 111000 is closed, if so, going to step S403, otherwise, going to step S407;
step S403: the first high up switch 1101 is turned off;
step S404: judging whether the first high-voltage switch 1101 is at the opening position, if so, entering the step S405, and failing to follow the jump;
step S405: pulling the first ground knife 111000 open;
step S406: judging whether the first ground knife 111000 is in the pulling position, if so, the following jump is successful, otherwise, the following jump fails;
step S407: closing the first ground knife 111000;
step S408: judging whether the first grounding switch 111000 is in the closing position, if so, entering the step S409, otherwise, failing to follow the jump;
step S409: the first high up switch 1101 is turned off;
step S410: judging whether the first high-voltage switch 1101 is at a switching-off position, if so, entering a step S411, otherwise, failing to follow the jump;
step S411: pulling the first ground knife 111000 open;
step S412: judging whether the first ground knife 111000 is in the pulling position, if so, going to 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 in the pulling position, if so, the following jump is successful, otherwise, the following jump fails;
step S415: the first high up switch 1101 is turned off;
step S416: and judging whether the first high-level switch 1101 is at the opening position, if so, the following jump is successful, and otherwise, the following jump fails.
In one embodiment, the executing the first section switch auto-close logic includes:
disconnecting a low-level switch of the main transformer with voltage loss; the main transformer with voltage loss is a first main transformer or a second main transformer, and correspondingly, the low-level switch is a first low-level switch or a second low-level switch; closing the first section switch; switching 10kV neutral points; executing the follow-jump of a high-level switch of the main transformer with voltage loss; the high-level switch is a first high-level switch or a second high-level switch of a 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 with voltage loss to be correctly grounded, and normal use after subsection switching is guaranteed. And the high-voltage switch of the main transformer with the voltage loss is tripped with the jump to open the high-voltage switch of the main transformer with the voltage loss.
As shown in fig. 6, in the fifth operation mode, the segment auto-casting logic includes the following steps:
s501: the first low going switch 501 is opened.
S502: and judging whether the first low-level switch 501 is in the opening position, if so, entering the step S503, otherwise, sending a failure signal of spare power automatic switching action and finishing the automatic switching.
S503: the switch 521 is closed.
S504: and judging 521 whether the switch is in a switching-on position, if so, entering the step S505, otherwise, sending a failure signal of spare power automatic switching action and finishing the automatic switching.
S505: and (4) judging whether the hard pressure plate and the soft pressure plate are both put into operation or not, if so, entering a 10kV neutral point switching subprogram, and otherwise, entering the step S507.
S506: and (4) judging whether the switching of the 10kV neutral point is successful, if so, entering the step S507, otherwise, sending a failure signal of spare power automatic switching action and finishing the automatic switching.
S507: and judging whether the hard pressing plate and the soft pressing plate are both switched, if so, entering a first variable-height switch 1101 jump sub-program, and otherwise, finishing the automatic switching.
S508: and judging whether the follow-jump of the first high-level switch 1101 is successful, if so, finishing the automatic switching, otherwise, sending a 'spare automatic switching action' failure signal and finishing the automatic switching.
The 10kV neutral switching subroutine related to step S505, the first high-voltage switch 1101 related to step S07 and the jump subroutine are substantially the same as the flows of fig. 4 and 5, respectively.
In one embodiment, the method further comprises:
in a first mode, the condition of judging the voltage loss of the working power supply is that: the low 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 going switch 501 has no flow;
2) the first bus 10kV1M has no voltage;
3) the second bus 10kV2M is pressureless.
And in a second mode, judging that the condition of the working power supply voltage loss meets the following conditions at the same time: the three-phase voltage of the buses of the two working power supplies is smaller than the non-voltage fixed value of the buses, and the three-phase current of one of the low-voltage switches is smaller than the non-current fixed value. Namely:
1) the three-phase voltages of the first bus 10kV1M and the second bus 10kV2M are both smaller than a bus non-voltage fixed value Uwy;
2) the three-phase currents of the first low-going switch 501 are all smaller than the no-current constant Ity.
In one embodiment, the method further comprises:
when the first mode charging condition is met, charging the first mode; the first mode charging condition is satisfied simultaneously: the main function hard pressing plate and the soft pressing plate are both switched, the main transformer-variable standby switching mode is effective, the first section switch is switched on, the working voltage variable switch is switched on, the standby power supply variable switch is switched off, and the three-phase voltages of the first bus and the second bus are all greater than a fixed value. Namely:
1) a total function hard pressing plate (1FLP1) and a soft pressing plate (YF _ ZGN) are put into use;
2) setting a main transformer low-backup switching mode control word (KBD) to be 1;
3) the first section switch 521 is in a closed state;
4) the first low-level switch 501 is switched on, and the second low-level switch 502 is switched off;
5) the three phases of the first bus 10kV1M and the second bus 10kV2M both satisfy the condition that the voltage is greater than a fixed value (Uyy).
When the second mode charging condition is met, charging the second mode; the second mode charging condition is simultaneously satisfied: the spare power automatic switching function pressing plate is switched on, the first low-voltage switch and the second low-voltage switch are switched on, the first section switch is switched off, and the first bus and the second bus have voltage and are not overhauled. Namely:
1) the spare power automatic switching function pressing plate is switched in;
2) the first low going switch 501 is in the on position;
3) second low switch 502 is in the on position;
4) the first section switch 521 is in the open position;
5) the first bus 10kV1M has pressure and is not overhauled;
6) the second busbar 10kV2M has pressure and is not overhauled.
In one embodiment, the method further comprises:
when the first mode discharge condition is met, discharging in a first mode; the first mode discharge condition is one of the following conditions:
1) exiting the 'total function hard pressing plate';
2) quitting the 'total function soft pressing plate';
3) second low switch 502 is in the on position;
4) three phases of the first bus 10kV1M or the second bus 10kV2M are both smaller than a bus no-voltage fixed value (Uwy), but the first low-voltage switch 501 or the second low-voltage switch 502 has current;
5) in the non-activated state, the post-closure position signal of the first low-level switch 501 changes from 1 to 0;
6) receiving an automatic operation locking signal or an external locking signal;
7) first low-down switch 501, second low-down switch 502, first bus 10kV1M or second bus 10kV2M service hard platen switch.
When the second mode discharge condition is met, discharging in a second mode; 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 has no voltage;
2) overhauling a first bus 10kV1M or a second bus 10kV 2M;
3) the first section switch 521 is overhauled or in a switching-on position;
4) receiving a hand jump signal from the first low-going switch 501 or the second low-going switch 502;
5) a #1 main transformer or a #2 main transformer becomes a backup protection action;
6) and the spare power automatic switching function pressing plate is withdrawn.
It can be understood that based on the above embodiments, operation logics of the third mode, the fourth mode, the seventh mode, and the eighth mode can be obtained, and details are not described again.
In one embodiment, a 10kv standby power source auto-switching control device is provided and 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 method and the device for controlling the automatic switching of the 10kV standby power supply, the standby power supply is in a hot standby state, so that the idle consumption of the standby power supply can be avoided.
Furthermore, by automatically processing the follow-jump of the variable-height switch of the voltage-loss main transformer and the switching of the neutral point, the complete processing logic of the automatic switching of the standby power supply is realized, and the problem that only the variable-height switch and the section switch are processed in the traditional switching mode is solved.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A10 KV standby power supply automatic switching control method is applied to a transformer substation comprising a first main transformer and a second main transformer; the first main transformer is connected with the 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 the power transmission network through a second high-voltage switch, and is connected with a second bus through a second low-voltage switch, and the second bus is connected with a second grounding transformer through a second grounding switch; a first section switch 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:
in the 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; when the working power supply is in voltage loss, executing the automatic switching logic of the standby power supply;
in the second mode: the first main transformer and the second main transformer are both used as working power supplies, and the first section switch is in open brake; and when one of the first main transformer and the second main transformer loses voltage, executing the automatic closing logic of the first section switch.
2. The method for controlling automatic switching of 10kv backup power according to claim 1, wherein the executing backup power automatic switching logic comprises:
a low-going switch for disconnecting the operating power supply; after the low-level switch of the working power supply is successfully switched off, the high-level switch of the standby power supply is automatically switched on; and after the high-level switch of the standby power supply is switched on, the low-level switch of the standby power supply is switched on.
3. The method of claim 2, wherein the executing backup power auto-commissioning logic further comprises:
after the low-voltage switch of the standby power supply is successfully switched on, 10kV neutral point switching is executed;
and after the switching of the 10kV neutral point is successful, executing the following jump of the high-voltage switch of the working power supply.
4. The method according to claim 3, wherein the standby power automatic switching logic is terminated when any one of the disconnection of the low-level switch of the operating power supply, the automatic switching of the high-level switch of the standby power supply, the closing of the low-level switch of the standby power supply, the switching of the 10kV neutral point, and the follow-jump of the high-level switch of the operating power supply fails.
5. The method for controlling the automatic switching of the 10kv standby power according to claim 1, wherein the executing the first section switch automatic closing logic comprises:
disconnecting a low-level switch of the main transformer with voltage loss; the main transformer with voltage loss is a first main transformer or a second main transformer, and correspondingly, the low-level switch is a first low-level switch or a second low-level switch;
closing the first section switch;
switching 10kV neutral points;
executing the follow-jump of a high-level switch of the main transformer with voltage loss; the high-level switch is a first high-level switch or a second high-level switch of a main transformer corresponding to voltage loss.
6. The method for controlling the automatic switching of the 10kV backup power supply according to claim 1, further comprising:
in a first mode, the condition of judging the voltage loss of the working power supply is that: the low-level 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;
and in a second mode, judging that the condition of the working power supply voltage loss meets the following conditions at the same time: the three-phase voltage of the buses of the two working power supplies is smaller than the non-voltage fixed value of the buses, and the three-phase current of one of the low-voltage switches is smaller than the non-current fixed value.
7. The method for controlling the automatic switching of the 10kV backup power supply according to claim 1, further comprising:
when the first mode charging condition is met, charging the first mode; the first mode charging condition is satisfied simultaneously: the main function hard pressure plate and the soft pressure plate are both put into operation, the main transformer-variable standby switching mode is effective, the first section switch is in switching-on, the working voltage variable switch is in switching-on, the standby power supply variable switch is in switching-off, and the three-phase voltages of the first bus and the second bus are all greater than a fixed value;
when the second mode charging condition is met, charging the second mode; the second mode charging condition is simultaneously satisfied: the spare power automatic switching function pressing plate is switched on, the first low-voltage switch and the second low-voltage switch are switched on, the first section switch is switched off, and the first bus and the second bus have voltage and are not overhauled.
8. The 10kV backup power supply automatic switching control method according to claim 3 or 5, wherein the 10kV neutral point switching comprises:
judging whether the positions of the first grounding switch and the second grounding switch are the same, if so, switching is successful; otherwise, the grounding switch of the standby power supply is switched on, the grounding switch of the working power supply is switched off, and when the grounding switch of the standby power supply is successfully switched on and the grounding switch of the working power supply is successfully switched off, the switching is successful.
9. The method for controlling automatic switching of 10kv standby power according to claim 8, wherein the step-down of the high-side switch comprises:
judging whether a hard pressure plate and a soft pressure plate are put into the automatic switching of the neutral point of the main transformer, if so, enabling a grounding switch of the working power supply to be in a pulling-open position, and separating a high-voltage switch of the working power supply, wherein when the high-voltage switch of the working power supply is successfully separated, the following jump is successful;
if the main transformer neutral point automatic switching hard pressure plate and the soft pressure plate are not switched, the height-changing switch of the working power supply is directly switched off, and when the height-changing switch of the working power supply is successfully switched off, the following jump is successful.
10. A 10kv backup power source auto-switch-on 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 one of claims 1 to 9 when executing the computer program.
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| CN116742788A (en) * | 2023-08-16 | 2023-09-12 | 华能澜沧江水电股份有限公司 | Automatic switching-on method and device for standby power supply |
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