CN113241844B - 10kV bus sectional spare power automatic switching method and device - Google Patents

10kV bus sectional spare power automatic switching method and device Download PDF

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Publication number
CN113241844B
CN113241844B CN202110700390.3A CN202110700390A CN113241844B CN 113241844 B CN113241844 B CN 113241844B CN 202110700390 A CN202110700390 A CN 202110700390A CN 113241844 B CN113241844 B CN 113241844B
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China
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switch
bus
voltage
section
power automatic
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CN113241844A (en
Inventor
李新海
肖星
凌霞
范德和
曾庆祝
周恒�
曾令诚
孟晨旭
卢泳茵
梁嘉伟
罗海鑫
邱天怡
周桂
贾子然
温云龙
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Guangdong Power Grid Co Ltd
Zhongshan Power Supply Bureau of Guangdong Power Grid Co Ltd
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Guangdong Power Grid Co Ltd
Zhongshan Power Supply Bureau of Guangdong Power Grid Co Ltd
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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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • 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
    • 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
    • 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
    • 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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  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention provides a method and equipment for sectionalized spare power automatic switching of a 10kV bus, and belongs to the technical field of transformer substations. The method comprises the following steps: determining a commissioning main transformer in a single-bus three-section annular 10kV bus wiring structure; determining a voltage-loss bus and a main supply low-voltage switch of the voltage-loss bus; judging whether the spare power automatic switching of the sectionalized section switch completes charging or not, if so, executing subsequent steps; tripping the main power supply low-voltage switch of the voltage-loss bus after the time of starting the delay constant value, judging whether the position of the main power supply low-voltage switch of the voltage-loss bus is in the branch position after the low-voltage switch trips to wait for the time of delaying the constant value, and if so, executing the spare power automatic switching action by the sectional switch in the branch position according to a preset priority strategy; and if not, the spare power automatic switching device of the sectional switch in the position division discharges and returns to the initial state. The invention solves the problems that the existing 10kV subsection spare power automatic switching is applied to a wiring structure of a single-bus three-subsection annular 10kV bus, the spare power automatic switching cannot be realized, the loop closing operation is not realized, and the main transformer is seriously overloaded.

Description

10kV bus sectional spare power automatic switching method and device
Technical Field
The invention relates to the technical field of transformer substations, in particular to a sectional spare power automatic switching method, equipment and a storage medium for a 10kV bus, which are suitable for a single-bus three-sectional annular 10kV bus wiring structure.
Background
The power system is influenced by factors such as peripheral environment interference, equipment failure and the like during operation, the power system can possibly break down to cause a large-area power failure accident, and the improvement of the power supply reliability of the power system plays an important role in promoting national economic development and improving the living standard of people. When the system bus loses power due to failure, the voltage of the system bus is reduced, the spare power automatic switching device can rapidly cut the original working power supply and switch the spare power supply, the normal power supply of the system bus is restored, and the power supply reliability of the system is improved. The automatic power switching device is applied to power grids of various voltage levels as an important measure for improving power supply reliability, and ensures that users obtain reliable power supply.
The existing 10kV spare power automatic switching method is only suitable for the connection mode that a 10kV bus is in a single-bus double-section mode or a single-bus single-section mode, however, with the development of urbanization and the requirement of high reliability of electric power for industrial and commercial purposes, the grid structure of an electric power system needs to be optimized, and the 10kV bus of the transformer substation is designed into a single-bus three-section annular connection mode as shown in fig. 1. Different from a single-bus double-section and single-bus single-section wiring mode, buses exist on two sides of any bus in a three-section annular structure, and the existing section spare power automatic switching has the following defects: when three main transformers respectively supply power to three sections of buses, when one section of bus is in voltage loss, the existing segmented spare power automatic switching device can simultaneously switch on a segmented switch connected with the voltage loss bus, so that 10kV bus side loop closing operation is caused; and secondly, when two main transformers supply power to three sections of buses, after one section of bus is in ground fault and is in voltage loss, the existing sectionalized spare power automatic switching device enables a closed sectionalized switch, namely a sectionalized switch, to be connected to the fault bus, so that the total station is in voltage loss. When the three main transformers respectively supply power to three sections of buses, when one section of bus is in voltage loss, the existing segmented spare power automatic switching device cannot determine whether to switch on the segmented switch connected with the light-load main transformer or not, and the segmented switch connected with the heavy-load main transformer can be switched on, so that the main transformer is seriously overloaded and the safety and the stability of the main transformer can be guaranteed only by switching off the load.
Disclosure of Invention
In view of this, the invention aims to solve the problem of closed loop operation or severe overload of a main transformer when the existing 10kV spare power automatic switching method is applied to a single-bus three-segment annular wiring structure.
In order to solve the technical problems, the invention provides the following technical scheme:
in a first aspect, the invention provides a method for sectionalized automatic bus transfer of a 10kV bus, which is applicable to a single-bus three-sectionalized annular 10kV bus wiring structure, and the wiring structure of the single-bus three-sectionalized annular 10kV bus specifically comprises:
the bus-bar switching device comprises a first main transformer, a second main transformer, a third main transformer, a first bus connected with the first main transformer through a first main transformer low-changing switch, a second bus connected with the second main transformer through a second main transformer low-changing switch, and a third bus connected with the third main transformer through a third main transformer low-changing switch, wherein the first bus is connected with the second bus through a first section switch, the second bus is connected with the third bus through a second section switch, and the third bus is connected with the first bus through a third section switch;
when at least two main transformers are put into operation in the wiring structure of a single-bus three-section annular 10kV bus, the sectional spare power automatic switching method comprises the following steps:
determining a commissioning main transformer in a single-bus three-section annular 10kV bus wiring structure;
acquiring switching values and analog quantities in a wiring structure of a single-bus three-section annular 10kV bus, and determining a main supply low-voltage switch of a voltage-loss bus and a voltage-loss bus according to the switching values and the analog quantities, wherein the voltage-loss bus is a first bus, a second bus or a third bus;
judging whether the spare power automatic switching of the sectionalized section switch completes charging or not, and if so, executing the subsequent steps;
tripping the main power supply low-voltage switch of the voltage-loss bus after the time of starting the delay constant value, judging the position of the main power supply low-voltage switch of the voltage-loss bus after the low-voltage switch trips to wait for the time of delaying the constant value, and if the main power supply low-voltage switch of the voltage-loss bus is in the branch position, executing the backup power automatic switching action by the sectional switch in the branch position according to a preset priority strategy; and if the main power supply low-change-over switch of the voltage-loss bus is in the closing position, the spare power automatic switch of the sectional switch in the sub position discharges and returns to the initial state.
Further, when the operation main in the single-bus three-section annular 10kV bus connection structure is changed into two, the section switch at one end of the bus corresponding to the non-operation main transformer is in the closed position and is recorded as a closed section switch, the section switch at the other end is in the separated position and is recorded as a first sequence separated section switch, the section switch connecting the buses corresponding to the two operation main transformers is in the separated position and is recorded as a second sequence separated section switch, and the section switch in the separated position executes the backup power automatic switching action according to the preset priority policy specifically includes:
s1: after the section switch is switched on for a delay time value, the section switch with a small number is switched on, and the section switch with the small number is a section switch with a small number in two section switches in a separation position;
s2: judging whether the section switch with the small number is in the closed position, if so, executing step S3, otherwise, executing step S4;
s3: judging whether the voltage of the voltage-loss bus is recovered, if so, successfully switching the backup power automatic switch of the sectional switch, and if not, executing the step S4;
s4: closing the section switch with the large number, judging whether the section switch with the large number is in a closed position, and if so, executing the step S5;
s5: and judging whether the voltage of the voltage-loss bus is recovered, if so, successfully switching the sectional switch backup power automatic switch.
Further, still include before the jump loses the main confession of voltage generating line low switch after starting time delay definite value time:
judging whether main transformer backup protection corresponding to the main supply low-voltage switch of the voltage-loss bus acts or not, if not, executing the main supply low-voltage switch of the voltage-loss bus and subsequent steps after starting delay fixed value time, and if so, executing the following steps;
judging whether the current of the on-position section switch is greater than a preset setting value, if so, discharging the spare power automatic switching of the first sequence section switch, and after the on-position section switch is tripped, carrying out spare power automatic switching by a second sequence section switch according to the spare power automatic switching action condition; if not, the spare power automatic switching of the second sequence position-dividing section switch discharges, and the first sequence position-dividing section switch performs spare power automatic switching according to spare power automatic switching operation conditions after the closing section switch is tripped.
Further, when the operation owner in the single-bus three-section annular 10kV bus connection structure becomes three, the first section switch, the second section switch and the third section switch are all in the branch position, and the execution of the backup power automatic switching action by the section switch in the branch position according to the preset priority policy specifically includes:
s1: judging whether the load rates of two main transformers connected with a non-voltage-loss bus are both smaller than or larger than a set value, if so, switching on a section switch with a small number after a section switch switching-on delay set value, wherein the section switch with the small number is a section switch with a small number positioned at two ends of the voltage-loss bus, otherwise, switching on a section switch connected with a main transformer-down switch with a small load rate after the section switch switching-on delay set value, and the section switch connected with a main transformer-down switch with a small load rate is a section switch connected with a main transformer-down switch with a small load rate positioned at two ends of the voltage-loss bus;
s2: judging whether the closed section switch is in a closed position, if so, executing step S3, otherwise, executing step S4;
s3: judging whether the voltage of the voltage-loss bus is recovered, if so, successfully switching the backup power automatic switch of the sectional switch, and if not, executing the step S4;
s4: closing the other section switch of the section switches at the two ends of the voltage-loss bus, judging whether the other section switch is in the closed position, if so, executing the step S5;
s5: and judging whether the voltage of the voltage-loss bus is recovered, if so, successfully switching the sectional switch backup power automatic switch.
Further, when the section switch simultaneously meets all conditions in the charging conditions, the spare power automatic switching charging is carried out, and the charging conditions specifically include:
the hard pressing plate with the sectional spare power automatic switching function of the sectional switch is switched;
the soft pressing plate with the sectional spare power automatic switching function of the sectional switch is switched;
the method comprises the steps that the sectional spare power automatic switching mode of a sectional switch is switched on and switched off to control word input;
the section switch is in a position division state;
and the three-phase voltage of the buses at the two ends connected with the section switches is greater than or equal to the voltage fixed value of the buses.
Further, the performing of the backup power automatic switching discharge when the section switch meets any one of the discharge conditions specifically includes:
discharging immediately after the spare power automatic switching function pressing plate of the section switch is withdrawn, wherein the function pressing plate comprises a hard pressing plate and a soft pressing plate;
the section switch is turned into on position and discharges after the discharging is delayed for a fixed time;
when the spare power automatic switching device is not started, the main power supply low-change switch discharges immediately after the position signal is switched from 1 → 0 or the hand jump signal is switched from 0 → 1 without manual reset;
when the spare power automatic switching is not started, when three main transformers supply three-section buses, the main power supply low-change switch backup protection action blocking signals are immediately discharged by the spare power automatic switching of two section switches connected after 0 → 1, and manual resetting is not needed;
when the spare power automatic switching is not started, when the two main transformers supply power to the three-section bus, the main power supply low-shifting switch backup protection action blocking signal is immediately discharged after 0 → 1 and when the current of the on-position sectional switch is greater than a setting value, the sectional spare power automatic switching of the first sequence position-dividing sectional switch does not need manual resetting;
the section switch discharges immediately after receiving an external blocking 1 signal and needs manual resetting;
discharging immediately after receiving the external latch 2 signal, and automatically recharging to judge the external latch 2 signal after the signal disappears;
PT three-phase disconnection occurs on any section of bus, and the section switch discharges immediately;
when two sections of buses connected with the section switch are subjected to PT three-phase disconnection, the section switch immediately discharges.
Further, the switching value specifically includes:
the switching position, the closing position or the hand trip signal and the backup protection action locking signal of the first main transformer low-change switch;
the switch position, the closed position or the hand trip signal of the second main transformer low-level switch and the backup protection action locking signal;
the switch position, the closed position or the hand trip signal of the third main transformer low-change switch and the backup protection action blocking signal;
the switch position of the first section switch, the switch position of the second section switch and the switch position of the third section switch;
the position of a functional pressure plate of the first section switch backup power automatic switch, the position of a functional pressure plate of the second section switch backup power automatic switch, the position of a functional pressure plate of the third section switch backup power automatic switch and the position of a maintenance pressure plate.
Further, the analog quantity specifically includes:
the three-phase current of the first main transformer low-voltage switch and the voltage of the first bus;
the three-phase current of the second main transformer low-voltage switch and the voltage of a second bus;
the three-phase current of a third main transformer low-voltage switch and the voltage of a third bus;
the three-phase current of the first section switch, the three-phase current of the second section switch and the three-phase current of the third section switch.
In a second aspect, the present invention provides a single bus three-segment ring type segmented spare power automatic switching device, which includes a processor and a memory:
the memory is used for storing the computer program and sending the instructions of the computer program to the processor;
the processor executes the sectional spare power automatic switching method of the 10kV bus according to the instructions of the computer program.
In a third aspect, the present invention provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the method for sectionalized automatic power switching of a 10kV bus according to the first aspect.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a method and equipment for sectionalized automatic bus transfer of a 10kV bus, which comprises the steps of firstly determining a main transformer which is put into operation in a single-bus and three-sectionalized annular wiring structure, then acquiring corresponding switching value and analog quantity in the wiring structure to determine a voltage-loss bus and a main transformer low-voltage switch for supplying power to the voltage-loss bus, jumping the main voltage-loss bus low-voltage switch after the charging of the sectionalized main automatic bus transfer is completed, and carrying out the automatic bus transfer action by the sectionalized switch according to a priority strategy when the main voltage-loss bus low-voltage switch is in a sectionalized position. According to the method, the priority strategy is set, so that when two main transformers supply power to three sections of buses, the section switches perform spare power automatic switching actions according to the priority strategy, the section spare power automatic switching devices in the separated positions can be in a mutual standby relation, and the condition that the section switches are closed at the same time to cause closed-loop operation is avoided. When the three main transformers respectively supply power to the three sections of buses, the problem that the main transformers are seriously overloaded due to the fact that the section switches connected with the heavy-load main transformer power supply buses are directly closed possibly can be solved according to the priority strategy.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a single-bus three-segment ring-shaped 10kV bus connection structure provided in an embodiment of the present invention;
fig. 2 is a schematic flow chart of a method for sectionalized automatic bus transfer of a 10kV bus according to an embodiment of the present invention;
fig. 3 is a sectional spare power automatic switching discharge condition diagram of three main transformer power supply three-section buses provided by the embodiment of the invention;
fig. 4 is a sectional spare power automatic switching discharge condition diagram of adjacent sectional switches of two main transformer power supply three-section buses according to an embodiment of the present invention;
fig. 5 is a sectional spare power automatic switching discharge condition diagram of a connected sectional switch of two main transformer power supply three-section buses according to an embodiment of the present invention;
fig. 6 is a logic diagram of a sectional backup power automatic switching operation of three buses of three main transformers for supplying power according to an embodiment of the present invention;
fig. 7 is a logic diagram of a sectionalized backup power automatic switching operation of three-section buses powered by two main transformers according to an embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 provides a single-bus three-section ring 10kV bus connection structure, which is characterized in that buses are arranged on two sides of any bus, so as to meet the current urbanization development and the requirement of high reliability of electric power for industrial and commercial industries. This wiring structure specifically includes:
the three-phase alternating current four-phase current four-phase current four-phase current four-phase current four-phase current four-phase current four-phase current four-current four.
The structure comprises the sectional spare power automatic switching logics of 3 sectional switches, namely a 4DL switch sectional spare power automatic switching device, namely a #1 sectional spare power automatic switching device, a 5DL switch sectional spare power automatic switching device, namely a #2 sectional spare power automatic switching device, and a 6DL switch sectional spare power automatic switching device, namely a #3 sectional spare power automatic switching device. The sectional spare power automatic switching logics of the 3 sectional switches are respectively and independently judged, the sectional spare power automatic switching charging logics of the 3 sectional switches are not affected with each other, and a hard pressing plate and a soft pressing plate are arranged for the functional switching of the 3 sectional spare power automatic switching logics, wherein the soft pressing plate has local and remote switching functions.
Referring to fig. 2, in the present embodiment, when the number of main transformers in operation in the single-bus three-segment annular 10kV bus connection structure is at least two, a method for a segmented backup power automatic switching of a 10kV bus is provided, which includes the following steps:
s101: and determining a commissioning main transformer in the single-bus three-section annular 10kV bus wiring structure.
S102: the method comprises the steps of collecting switching values and analog quantities in a wiring structure of a single-bus three-section annular 10kV bus, and determining a main supply low-voltage switch of a voltage-loss bus and a voltage-loss bus according to the switching values and the analog quantities, wherein the voltage-loss bus is a first bus, a second bus or a third bus.
It should be noted that, in this step, the collecting of the switching values of the low positions of the 3 main transformers, the switching values of the positions of the 3 section switches, and the switching values of the pressing plate specifically includes:
firstly, a first transformer becomes switching values such as a switching position, a closing position (or a hand-jumping signal), a backup protection action locking signal and the like of a 1DL switch; secondly, the second transformer becomes switching values such as the switching position, the closed position (or a hand-jumping signal), a backup protection action locking signal and the like of a 2DL switch; the third transformer becomes switching values such as the switching position, the closing position (or a hand-jumping signal), a backup protection action locking signal and the like of a 3DL switch; the switching value of the switching position of the 10kV #1 sectional 4DL switch; the switching position switching value of a 10kV #2 sectional 5DL switch; sixthly, the switching value of the switching position of the 10kV #3 subsection 6DL switch; seventhly, switching values such as a #1 sectional spare power automatic switching function pressure plate, a #2 sectional spare power automatic switching function pressure plate, a #3 sectional spare power automatic switching function pressure plate and a corresponding maintenance pressure plate are obtained.
Gather corresponding 3 main transformer step-down three-phase current and three-section busbar voltage, the analog quantity of gathering promptly specifically includes:
firstly, a first transformer becomes a three-phase current and a 10kV IM voltage of a 1DL switch; secondly, the second transformer reduces the three-phase current and 10kV IIM voltage of the 2DL switch; a third transformer becomes the three-phase current and the 10kVIIIM voltage of the 3DL switch; fourthly, the three-phase current of the #1 sectional 4DL switch; the three-phase current of the #2 sectional 5DL switch; sixthly, #3 three-phase current for a sectionalized 6DL switch.
In addition, the sectionalized automatic power switching method described in this embodiment may open the amount of switching of the transformer low 1DL switch of the first transformer, the transformer low 2DL switch of the second transformer, the transformer low 3DL switch of the third transformer, the switch-on and switch-off #1 section 4DL switch, the switch-on and switch-off #2 section 5DL switch, and the switch-on and switch-off #3 section 6DL switch.
S103: and judging whether the spare power automatic switching of the sectionalized switches finishes charging or not, and if so, executing the subsequent steps.
It should be noted that the charging can be completed after the charging delay fixed value time is passed and the charging condition is as follows: firstly, a hard pressing plate with a sectional spare power automatic switching function of the switch is put into use; secondly, the soft pressing plate with the segmented spare power automatic switching function of the switch is switched; thirdly, the character input is controlled by the sectional spare power automatic switching mode of the switch; the section switch is divided into several positions; the three-phase voltage of two sections of buses connected with the section switch is more than or equal to the voltage fixed value of the bus.
S104: tripping the main power supply low-voltage switch of the voltage-loss bus after the time of starting the delay constant value, judging the position of the main power supply low-voltage switch of the voltage-loss bus after the low-voltage switch trips to wait for the time of delaying the constant value, and if the main power supply low-voltage switch of the voltage-loss bus is in the branch position, executing the backup power automatic switching action by the sectional switch in the branch position according to a preset priority strategy; and if the main power supply low-voltage switch of the voltage-loss bus is in the closed position, the spare power automatic switch of the sectional switch in the separated position discharges electricity and returns to the initial state.
Please refer to fig. 3 to 5, in this embodiment, the discharging logic of the sectionalized automatic power switches of 3 sectionalized switches is as follows, and any 10kV sectionalized automatic power switch discharges when it meets any one of the following conditions: discharging immediately after a spare power automatic switching function pressure plate (comprising a hard pressure plate and a soft pressure plate) is withdrawn; secondly, the section switch is turned on, and the spare power automatic switching discharges after the discharge time delay fixed value time; when the spare power automatic switching device is not started, the main power supply low-change switch discharges immediately after the position signal is switched from 1 → 0 (or the hand jump signal is from 0 → 1), and manual reset is not needed; when the spare power automatic switching is not started, the backup protection action blocking signal of the main power supply low-change switch when three main transformers supply three-section buses is immediately discharged by the subsection spare power automatic switching of the two subsection switches connected after 0 → 1, and manual resetting is not needed; when the spare power automatic switch is not started, when the two main transformers supply power to the three-section bus, the main power supply low-change switch backup protection action blocking signal is immediately discharged after 0 → 1 and when the current of the on-position section switch is greater than a setting value, the section spare power automatic switch of the adjacent section switch does not need manual resetting; when the spare power automatic switch is not started, when three buses are supplied by two main transformers, a main power supply low-change switch backup protection action blocking signal is immediately discharged from the section spare power automatic switch of the connected section switch after 0 → 1 and when the current of the closed section switch is smaller than a setting value, and manual resetting is not needed; seventhly, discharging immediately after receiving an external locking 1 signal, and manually resetting; discharging immediately after receiving the external locking 2 signal, and automatically recharging and distinguishing after the signal disappears; ninthly, any section of bus generates PT three-phase disconnection, and the device discharges immediately; and the backup power automatic switch immediately discharges when PT (potential transformer) disconnection occurs in two sections of buses connected with the section switch at the R (capacitor).
According to the sectional spare power automatic switching method and equipment for the 10kV bus, a main transformer put into operation in a single-bus three-sectional annular wiring structure is determined, then corresponding switching values and analog quantities in the wiring structure are acquired to determine a voltage-loss bus and a main transformer low-change switch for supplying power to the voltage-loss bus, after charging of the sectional switch in a sub-position is completed, the main transformer low-change switch for the voltage-loss bus is tripped, and when the main transformer low-change switch for the voltage-loss bus is in the sub-position, the sectional switch performs spare power automatic switching according to a priority strategy. According to the method, the priority strategy is set, so that when two main transformers supply power to three sections of buses, the section switches perform spare power automatic switching actions according to the priority strategy, the section spare power automatic switching devices in the separated positions can be in a mutual standby relation, and the condition that the section switches are closed at the same time to cause closed-loop operation is avoided. When the three main transformers respectively supply power to the three sections of buses, the problem that the main transformers are seriously overloaded due to the fact that the section switches connected with the heavy-load main transformer power supply buses are directly closed possibly can be solved according to the priority strategy.
The above is a detailed description of an embodiment of the method for sectionalized automatic power switching of the 10kV bus, and another embodiment of the method for sectionalized automatic power switching of the 10kV bus is described in detail below.
Referring to fig. 7, in the present embodiment, when the number of main transformers in operation in the single-bus three-segment ring-shaped 10kV bus connection structure is two, that is, when two main transformer low-voltage switches are in an on position to respectively supply power to the buses, another main transformer low-voltage switch is in an off position, the buses supplied with power are supplied with power through one segment switch, the other two segment switches are in an off position, the segment backup power automatic switching of the two segment switches meets the charging condition, and when the charging is completed after the charging delay, the priority policy is elaborated in detail.
When the operation main in the single-bus three-section annular 10kV bus connection structure is changed into two, the section switch at one end of the bus corresponding to the non-operation main is in the closed position and is recorded as a closed section switch, the section switch at the other end is in the separated position and is recorded as a first sequence separated section switch, the section switch connecting the buses corresponding to the two operation main is in the separated position and is recorded as a second sequence separated section switch, and the section switch in the separated position executes the spare power automatic switching action according to the preset priority strategy specifically comprises the following steps:
s1: after the section switch is switched on for a delay time value, the section switch with a small number is switched on, and the section switch with the small number is a section switch with a small number in two section switches in a separation position;
s2: judging whether the section switch with the small number is in the closed position, if so, executing step S3, otherwise, executing step S4;
s3: judging whether the voltage of the voltage-loss bus is recovered, if so, successfully switching the backup power automatic switch of the sectional switch, and if not, executing the step S4;
s4: closing the sectionalized switches with large numbers, judging whether the sectionalized switches with large numbers are in closed positions, and if so, executing the step S5;
s5: and judging whether the voltage of the voltage-loss bus is recovered, if so, successfully switching the sectional switch backup power automatic switch.
In the method described in this embodiment, two 10kV segment backup power automatic switches complete charging, if a 10kV bus is out of voltage, two backup power automatic switches meet an action condition, a backup power automatic switch with a high priority (i.e., a small number) takes a priority action, and another segment backup power automatic switch takes another action after the backup power automatic switch fails. The present embodiment is described in detail below with reference to an example of a single bus three-segment ring 10kV bus connection structure.
1) When 1DL and 3DL respectively supply power to the bus, the 2DL switch is in the on position, the sectional switch 4DL is in the off position, the sectional switches 5DL and 6DL are in the off position (hot standby state), the #2 and #3 sectional spare power automatic switches all meet the charging condition, and charging is completed after charging delay. When the bus is in voltage loss, the sectional backup power automatic switching action is as follows: firstly, if a 10kV I M bus is in voltage loss and an II M bus is also in voltage loss, then a 10kV #3 subsection spare power automatic switching device simultaneously meets the conditions that the three-phase voltage of the I M bus is smaller than the non-voltage fixed value and the low-to-voltage 1DL switch current of a first transformer is smaller than the no-current fixed value, and a 10kV #2 subsection spare power automatic switching device simultaneously meets the conditions that the three-phase voltage of the II M bus is smaller than the non-voltage fixed value and the low-to-voltage 2DL switch current of a second transformer is smaller than the no-current fixed value, then the 10kV #2 subsection spare power automatic switching priority action jumps the first transformer low-level 1DL switch after the starting delay fixed value time, if the 1DL switch is in the position division within the time of the low-level switch trip waiting delay fixed value time, if the spare power automatic switching operation is unsuccessful within the switching-on waiting delay of the sectional spare power automatic switching switch, the position of the sectional switch 6DL is switched on, and the spare power automatic switching operation is successful; if the 1DL switch is still in the closing position after the low-level switch trips to wait for the delay fixed value time, the two spare power automatic switching devices discharge and return, and the spare power automatic switching operation fails. If the 10kVIIIM bus is under voltage loss, the 10kV #3 sectional spare power automatic switching device simultaneously meets the conditions that the three-phase voltage of the IIIM bus is smaller than a non-voltage fixed value and the current of a step-down 3DL switch of a third transformer is smaller than a non-current fixed value, and the 10kV #2 sectional spare power automatic switching device simultaneously meets the conditions that the three-phase voltage of the IIIM bus is smaller than the non-voltage fixed value and the current of a step-down 3DL switch of the third transformer is smaller than the non-current fixed value, the 10kV #2 sectional spare power automatic switching device is subjected to preferential action of tripping the first transformer to the step-down 3DL switch after the time of starting delay fixed value, if the 3DL switch is in a separated position in the time of trip delay of the step-down switch, the sectional switch 5DL is closed, the spare power automatic switching action is successful, and if the spare power automatic switching device is not successful in the time of closing delay of the sectional spare power automatic switching device, the position of the sectional switch 6DL is closed, and the spare power automatic switching action is successful; if the 3DL switch is still in the closed position after the low-level switch trips to wait for the delay fixed value time, the two spare power automatic switching devices discharge and return, and the spare power automatic switching operation fails.
2) When 1DL and 2DL respectively supply power to the bus, the 3DL switch is in the on position, the sectional switch 6DL is in the off position, the sectional switches 4DL and 5DL are in the off position (hot standby state), the #1 and #2 sectional spare power automatic switches all meet the charging condition, and charging is completed after charging delay. When the bus is in voltage loss, the sectional backup power automatic switching action is as follows: firstly, if the 10kV I M bus is in voltage loss, the IIIM bus is also in voltage loss, then the 10kV #1 sectional spare power automatic switching device simultaneously meets the conditions that the three-phase voltage of the I M bus is smaller than the non-voltage fixed value and the step-down 1DL switch current of the first transformer is smaller than the non-current fixed value, and the 10kV #2 sectional spare power automatic switching device simultaneously meets the conditions that the three-phase voltage of the IIIM bus is smaller than the non-voltage fixed value and the step-down 3DL switch current of the third transformer is smaller than the non-current fixed value, then the 10kV #1 subsection spare power automatic switching priority action jumps the first transformer low-level 1DL switch after the starting delay fixed value time, if the 1DL switch is in the position division within the time of the low-level switch trip waiting delay fixed value time, if the spare power automatic switching operation is unsuccessful within the switching-on waiting delay of the sectional spare power automatic switching switch, the position of the sectional switch 5DL is switched on, and the spare power automatic switching operation is successful; if the 1DL switch is still in the closing position after the low-level switch trips to wait for the delay fixed value time, the two spare power automatic switching devices discharge and return, and the spare power automatic switching operation fails. If the 10kV IIM bus is in voltage loss, the 10kV #1 segmented spare power automatic switching device simultaneously meets the conditions that the three-phase voltage of the IIM bus is smaller than the non-voltage fixed value and the current of the second transformer step-down 2DL switch is smaller than the non-current fixed value, and the 10kV #2 segmented spare power automatic switching device simultaneously meets the conditions that the three-phase voltage of the IIM bus is smaller than the non-voltage fixed value and the current of the second transformer step-down 2DL switch is smaller than the non-current fixed value, the 10kV #1 segmented spare power automatic switching device is preferentially operated to jump the second transformer step-down 2DL switch after the time of starting the delay fixed value, if the 2DL switch is in the time of waiting for the trip of the step-down switch to be in the off position, the segmented switch 4DL is operated, the spare power automatic switching device is successfully operated, and if the spare power automatic switching device is not successfully operated in the time of waiting for the switching on of the segmented spare power automatic switching device, the segmented switch 5DL is operated, and the spare power automatic switching device is successfully operated; if the 2DL switch is still in the closed position after the low-level switch trips to wait for the delay fixed value time, the two spare power automatic switching devices discharge and return, and the spare power automatic switching operation fails.
3) When the 2DL and the 3DL respectively supply power to the bus, the 1DL switch is in the on position, the sectional switch 4DL is in the off position, the sectional switches 5DL and 6DL are in the off position (hot standby state), the #2 and #3 sectional spare power automatic switches all meet the charging condition, and charging is completed after charging delay. When the bus is in voltage loss, the sectional backup power automatic switching action is as follows: firstly, if the 10kV IIM bus is in voltage loss, the I M bus is also in voltage loss, if the 10kV #2 subsection spare power automatic switching simultaneously meets the conditions that the three-phase voltage of the II M bus is smaller than the non-voltage fixed value and the step-down 2DL switching current of the 2 nd transformer is smaller than the non-current fixed value, if the 10kV #3 subsection spare power automatic switching simultaneously meets the conditions that the three-phase voltage of the I M bus is smaller than the non-voltage fixed value and the step-down 1DL switching current of the first transformer is smaller than the non-current fixed value, then the 10kV #2 subsection spare power automatic switching priority action jumps the first transformer low-level 2DL switch after the starting delay fixed value time, if the 2DL switch is in the position division within the time of the low-level switch trip waiting delay fixed value time, if the spare power automatic switching operation is unsuccessful within the switching-on waiting delay of the sectional spare power automatic switching switch, the position of the sectional switch 6DL is switched on, and the spare power automatic switching operation is successful; if the 2DL switch is still in the closed position after the low-level switch trips to wait for the delay fixed value time, the two spare power automatic switching devices discharge and return, and the spare power automatic switching operation fails. If the 10kVIIIM bus is under a voltage loss condition, the 10kV #2 subsection spare power automatic switching device simultaneously meets the conditions that the three-phase voltage of the IIIM bus is smaller than a non-voltage fixed value and the current of a step-down 3DL switch of a third transformer is smaller than a non-current fixed value, and the 10kV #3 subsection spare power automatic switching device simultaneously meets the conditions that the three-phase voltage of the IIIM bus is smaller than the non-voltage fixed value and the current of a step-down 3DL switch of the third transformer is smaller than the non-current fixed value, the 10kV #2 subsection spare power automatic switching device is subjected to a preferential action of tripping the step-down 3DL switch of the third transformer after the time of starting delay fixed value, if the step-down switch is in a trip delay time of the 3DL switch, the subsection switch 5DL is closed, the spare power automatic switching action is successful, and if the spare power automatic switching device is not successful in a closing delay time of the subsection spare power automatic switching device automatic switching switch, the position of the subsection switch 6DL is closed, and the spare power automatic switching action is successful; if the 2DL switch is still in the closed position after the low-level switch trips to wait for the delay fixed value time, the two spare power automatic switching devices discharge and return, and the spare power automatic switching operation fails.
The above example is a detailed description of the backup power automatic switching action according to a priority strategy when any two main transformers supply power to three buses in a single-bus three-segment annular 10kV bus wiring structure. According to the sectional spare power automatic switching method for the 10kV bus, when the number of the operation main is changed into two, the sectional switches are switched on first according to the priority strategy, and then the switches with the small numerical numbers are switched on unsuccessfully. The two section switches are always in a standby relation with each other, and the condition of closed-loop operation caused by closing the section switches simultaneously is avoided when the spare power automatic switching is carried out.
The above is a detailed description of an embodiment of the method for sectionalized automatic power switching of the 10kV bus, and another embodiment of the method for sectionalized automatic power switching of the 10kV bus is described in detail below.
Referring to fig. 6, in this embodiment, when the number of main transformers in a single-bus three-segment ring 10kV bus connection structure is three, that is, when 1DL, 2DL, and 3DL respectively supply power to buses, the segmented switches 4DL, 5DL, and 6DL are in a separated position (hot standby state), and all the segmented backup power automatic switches #1, #2, and #3 satisfy charging conditions, when charging is completed after charging delay, a priority policy is elaborated in detail, and the specific steps are as follows:
s1: judging whether the load rates of two main transformers connected with a non-voltage-loss bus are both smaller than or larger than a set value, if so, switching on a section switch with a small number after a section switch switching-on delay set value, wherein the section switch with the small number is a section switch with a small number positioned at two ends of the voltage-loss bus, otherwise, switching on a section switch connected with a main transformer-down switch with a small load rate after the section switch switching-on delay set value, and the section switch connected with a main transformer-down switch with a small load rate is a section switch connected with a main transformer-down switch with a small load rate positioned at two ends of the voltage-loss bus;
s2: judging whether the closed section switch is in a closed position, if so, executing step S3, otherwise, executing step S4;
s3: judging whether the voltage of the voltage-loss bus is recovered, if so, successfully switching the backup power automatic switch of the sectional switch, and if not, executing the step S4;
s4: closing the other section switch of the section switches at the two ends of the voltage-loss bus, judging whether the other section switch is in the closed position, if so, executing the step S5;
s5: and judging whether the voltage of the voltage-loss bus is recovered, if so, successfully switching the sectional switch backup power automatic switch.
In the method described in this embodiment, when a 10kV bus is under-voltage, two backup power automatic switches meet the action condition, the power transmitted by the main transformer change-down switch connected to the non-voltage-loss bus does not reach the set value, and the backup power automatic switches perform the priority action, when the power transmitted by the main transformer change-down switch connected to the non-voltage-loss bus does not reach the set value or exceeds the set value, the backup power automatic switches with high priority (with small number) perform the priority action, and when the power transmitted by the main transformer change-down switch connected to the non-voltage-loss bus does not reach the set value or exceeds the set value, the other backup power automatic switches perform the priority action again in a subsection manner. The present embodiment is described in detail below with reference to an example of a single bus three-segment ring 10kV bus connection structure.
1) When the 10kV I M bus is under no-voltage condition, the #1 and #3 sectional backup power automatic switching meet the action condition, at this time, the method of the invention firstly checks the variable low power of the #2 main transformer and the variable low power of the #3 main transformer, if the variable low power of the #2 main transformer exceeds the set value and the variable low power of the #3 main transformer does not exceed the set value, the #3 backup power automatic switching operates preferentially, and if the variable low power of the #2 main transformer and the variable low power of the #3 main transformer do not exceed the set value or both exceed the set value, the #1 sectional backup power automatic switching operates preferentially.
2) When the 10kV IIM bus is under no-voltage condition, the #1 and #2 sectional backup power automatic switching meet the operation condition, at the moment, the method of the invention firstly checks the variable low power of the #1 main transformer and the variable low power of the #3 main transformer, if the variable low power of the #1 main transformer exceeds the set value and the variable low power of the #3 main transformer does not exceed the set value, the #2 backup power automatic switching operates preferentially, and if the variable low power of the #1 main transformer and the variable low power of the #3 main transformer do not exceed the set value or both exceed the set value, the #1 sectional backup power automatic switching operates preferentially.
3) When the 10kVIIIM bus is under voltage loss, the #2 and #3 sectional backup power automatic switching meet the action condition, at the moment, the method of the invention firstly checks the low power of the #1 main transformer and the low power of the #2 main transformer, if the low power of the #2 main transformer exceeds the set value and the low power of the #1 main transformer does not exceed the set value, the #3 backup power automatic switching operates preferentially, and if the low power of the #1 main transformer and the low power of the #3 main transformer do not exceed the set value or both exceed the set value, the #2 sectional backup power automatic switching operates preferentially.
The detailed description of the spare power automatic switching action is carried out according to the priority strategy when three main transformers supply power to three sections of buses in the single-bus three-section annular 10kV bus wiring structure. According to the sectional spare power automatic switching method for the 10kV bus, when the number of operation masters is three, the sectional switches judge the loads of the sectional switches according to a priority strategy. If the power transmitted by the main transformer low-voltage switch connected with the non-voltage-loss bus does not reach the set value or exceeds the set value, the spare power automatic switching with high priority (with small number) takes priority action, and the other subsection spare power automatic switching does not take action again after the power transmitted by the main transformer low-voltage switch connected with the non-voltage-loss bus fails; if one of the power transmitted by the main transformer low-voltage switch connected with the non-voltage-loss bus is larger than a set value and the other power is smaller than a set value, when one section of bus is in voltage loss, the spare power automatic switching device of the embodiment firstly switches on the section switch connected with the light-load main transformer power supply bus, and the section switch connected with the heavy-load main transformer power supply bus can not be switched on after the section switch is switched on. By setting the priority strategy, the embodiment avoids the problem that the existing segmented spare power automatic switching cannot determine whether to switch on the segmented switch connected with the light-load main transformer or not at first, and the segmented switch connected with the power supply bus of the heavy-load main transformer can be switched on, so that the main transformer is seriously overloaded and the safety and the stability of the main transformer can be guaranteed only by switching off the load.
The above is a detailed description of an embodiment of the method for sectionalized automatic power switching of the 10kV bus, and another embodiment of the method for sectionalized automatic power switching of the 10kV bus is described in detail below.
This embodiment is directed at when the quantity of commissioning main transformer is two in single-bus three segmentation annular 10kV bus connection structure, after a section of bus takes place ground fault and loses voltage, to the main transformer backup protection action of this section of bus power supply, the segmentation spare power automatic switching method that this embodiment provided can effectual isolation trouble bus, specifically as follows:
before tripping main power supply of voltage-loss bus low-level switch after starting time delay definite value time, the method also comprises the following steps:
judging whether main transformer backup protection corresponding to the main supply low-voltage switch of the voltage-loss bus acts or not, if not, executing the main supply low-voltage switch of the voltage-loss bus and subsequent steps after starting delay fixed value time, and if so, executing the following steps;
judging whether the current of the on-position sectional switch is larger than a preset setting value or not, if so, carrying out spare power automatic switching action on the first sequence on-position sectional switch (namely the sectional switch of the adjacent sections), and carrying out spare power automatic switching action on the second sequence on-position sectional switch (namely the sectional switch of the connected sections) according to the spare power automatic switching action condition after the on-position sectional switch is tripped; if not, the spare power automatic switching of the second sequence position-dividing section switch discharges, and the first sequence position-dividing section switch performs spare power automatic switching according to spare power automatic switching operation conditions after the closing section switch is tripped.
The present embodiment is described in detail below with reference to an example of a single bus three-segment ring 10kV bus connection structure.
1) When 1DL and 3DL respectively supply power to the bus, a 2DL switch is in a separate position, a sectional switch 4DL is in a close position, sectional switches 5DL and 6DL are in a separate position (hot standby state), sectional standby power automatic switching of #2 and #3 meets charging conditions, charging is completed after charging delay, if the standby protection action of a #1 main transformer is performed at the moment, and the current of the 4DL switch is greater than a setting value, the sectional standby power automatic switching of #2 discharges, the sectional standby power automatic switching of #3 does not discharge, after the 4DL of the sectional switch jumps off an isolation fault, the sectional standby power automatic switching action of #3 closes 6DL after meeting the condition of the sectional power automatic switching action of #3, and the voltage of the I M bus is recovered; at the moment, if the #1 main transformer backup protection action is carried out and the 4DL switch current does not reach the setting value, the #2 segmented spare power automatic switching does not discharge, the #3 segmented spare power automatic switching discharges, after the 4DL of the segmented switch trips to the isolation fault, the #2 segmented spare power automatic switching action is switched on to carry out 5DL, and the IIM bus voltage is recovered after the #2 segmented spare power automatic switching action condition is met.
2) When 1DL and 2DL respectively supply power to the bus, a 3DL switch is in a separate position, a sectional switch 6DL is in a close position, sectional switches 4DL and 5DL are in a separate position (hot standby state), both the #1 and #2 sectional spare power automatic switching meet the charging condition, the charging is completed after the charging delay, at the moment, if the #1 main transformer backup protection action is carried out, and the current of the 6DL switch is greater than a setting value, the #2 sectional spare power automatic switching discharges, the #1 sectional spare power automatic switching does not discharge, after the sectional switch 6DL jumps away from an isolation fault, the #1 sectional spare power automatic switching action meets the #1 spare power automatic switching action condition, the 4DL is switched on, and the IM bus voltage is recovered; at the moment, if the #1 main transformer backup protection action is carried out and the 6DL switch current does not reach the setting value, the #2 subsection spare power automatic switching does not discharge, the #1 subsection spare power automatic switching discharges, after the 6DL of the subsection switch trips to the isolation fault, the #2 subsection spare power automatic switching action is closed to 5DL, and the IIIM bus voltage is recovered after the #2 spare power automatic switching action condition is met.
3) When 2DL and 3DL respectively supply power to the bus, the 1DL switch is in a separate position, the sectional switch 4DL is in a closed position, the sectional switches 5DL and 6DL are in a separate position (hot standby state), the #2 and #3 sectional spare power automatic switching all meet the charging condition, the charging is completed after the charging delay, at the moment, if the #2 main transformer backup protection action is carried out, and the 4DL switch current is greater than a setting value, the #3 sectional spare power automatic switching discharges, the #2 sectional spare power automatic switching does not discharge, after the sectional switch 6DL jumps away from the isolation fault, the #2 sectional spare power automatic switching action is switched on by the #2 sectional spare power automatic switching action after meeting the #2 spare power automatic switching action condition, and the IIM bus voltage is recovered; at the moment, if the #2 main transformer backup protection acts and the 4DL switch current does not reach a setting value, the #3 segmented spare power automatic switching does not discharge, the #2 segmented spare power automatic switching discharges, after the segmented switch 6DL trips to isolate a fault, the #3 segmented spare power automatic switching acts to switch on the #3 segmented spare power automatic switching, and the I M bus voltage is recovered.
In the method for the sectionalized automatic power switch-on, provided by the embodiment, when two main transformers supply power to three buses, and after one bus supplied with power by a closed sectionalizing switch is subjected to ground fault and voltage loss, the main transformer backup protection action for supplying power to the bus isolates the fault and locks the sectionalized automatic power switch-on of an adjacent sectionalizing switch. The problem of when two main transformers supply power to three-section bus, when one section bus takes place earth fault and loses voltage, current segmentation spare power automatic switching closes the segmentation switch that closes promptly and closes the trouble bus, causes the total station to lose voltage is solved.
The above is a detailed description of an embodiment of the method for sectionalized automatic power switching of a 10kV bus, and the following is a detailed description of an embodiment of the equipment for sectionalized automatic power switching of a 10kV bus.
The device includes a processor and a memory:
the memory is used for storing the computer program and sending the instructions of the computer program to the processor;
the processor executes the sectional spare power automatic switching method of the 10kV bus according to the instructions of the computer program.
The above is a detailed description of an embodiment of a method for sectionalized automatic power switching of a 10kV bus according to the present invention, and the following is a detailed description of an embodiment of a computer-readable storage medium according to the present invention.
A computer readable storage medium, on which a computer program is stored, and when executed by a processor, the computer program implements a method for sectionalized automatic power switching of a 10kV bus according to the foregoing embodiments.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (9)

1. A10 kV bus subsection spare power automatic switching method is suitable for a single bus three subsection annular 10kV bus wiring structure, and is characterized in that the single bus three subsection annular 10kV bus wiring structure specifically comprises the following steps:
the bus-bar switching device comprises a first main transformer, a second main transformer, a third main transformer, a first bus connected with the first main transformer through a first main transformer low-change switch, a second bus connected with the second main transformer through a second main transformer low-change switch, and a third bus connected with the third main transformer through a third main transformer low-change switch, wherein the first bus is connected with the second bus through a first section switch, the second bus is connected with the third bus through a second section switch, and the third bus is connected with the first bus through a third section switch;
when at least two main transformers are put into operation in the wiring structure of the single-bus three-section annular 10kV bus, the sectional spare power automatic switching method comprises the following steps:
determining a main transformer to be put into operation in the single-bus three-section annular 10kV bus wiring structure;
acquiring switching values and analog quantities in a wiring structure of the single-bus three-section annular 10kV bus, and determining a voltage-loss bus and a main supply low-voltage switch of the voltage-loss bus according to the switching values and the analog quantities, wherein the voltage-loss bus is the first bus, the second bus or the third bus;
judging whether the spare power automatic switching of the sectionalized section switch completes charging or not, and if so, executing the subsequent steps;
tripping a main power supply low-voltage switch of the voltage-loss bus after the time of starting the delay constant value, judging whether the position of the main power supply low-voltage switch of the voltage-loss bus is in a branch position or not after the low-voltage switch trips to wait for the time of delaying the constant value, and if so, executing a spare power automatic switching action by the sectional switch in the branch position according to a preset priority strategy; if not, the spare power automatic switching of the sectional switch in the sub-position discharges and returns to the initial state;
when the operation main in the single-bus three-section annular 10kV bus connection structure is changed into two, the section switch at one end of the bus corresponding to the non-operation main is in the closed position and is recorded as a closed section switch, the section switch at the other end is in the separated position and is recorded as a first sequence separated section switch, the section switch connecting the buses corresponding to the two operation main is in the separated position and is recorded as a second sequence separated section switch, and the section switch in the separated position executes the spare power automatic switching action according to the preset priority strategy specifically comprises the following steps:
s1: switching on the section switch with small number after the section switch switching-on delay time value, wherein the section switch with small number is a section switch with small number in two section switches in a separation position;
s2: judging whether the section switch with the small number is in the closed position, if so, executing step S3, otherwise, executing step S4;
s3: judging whether the voltage of the voltage-loss bus is recovered, if so, successfully switching the section switch backup power automatic switch, and if not, executing the step S4;
s4: closing the section switch with the large number, judging whether the section switch with the large number is in a closed position, and if so, executing the step S5;
s5: and judging whether the voltage of the voltage-loss bus is recovered, if so, successfully switching the sectional switch backup power automatic switch.
2. The method for sectionally preparing power automatic switching of a 10kV bus according to claim 1, wherein the step-down switch of the main power supply of the tripping-voltage bus after the starting delay time is further provided with:
judging whether main transformer backup protection corresponding to the main supply low-voltage switch of the voltage-loss bus acts or not, if not, executing the main supply low-voltage switch of the voltage-loss bus after the starting delay fixed value time and subsequent steps thereof, and if so, executing the following steps;
judging whether the current of the on-position section switch is greater than a preset setting value, if so, discharging the spare power automatic switching of the first sequence section switch, and after the on-position section switch is tripped, performing spare power automatic switching action on the second sequence section switch according to the spare power automatic switching action condition; if not, the spare power automatic switching of the second sequence position-dividing section switch discharges, and after the closed position section switch is tripped, the first sequence position-dividing section switch performs spare power automatic switching according to spare power automatic switching operation conditions.
3. The method for sectionalized automatic power switch-on of a 10kV bus according to claim 2, wherein when the number of commissioning main lines in the single-bus three-sectionalized ring type 10kV bus connection structure is three, the first sectionalizing switch, the second sectionalizing switch and the third sectionalizing switch are all in a split position, and the performing of the automatic power switch-on action by the sectionalized sectionalizing switches according to a preset priority policy specifically comprises:
s1: judging whether the load rates of two main transformers connected with a non-voltage-loss bus are both smaller than or larger than a set value, if so, switching on a section switch with a small number after a section switch switching-on delay set value, wherein the section switch with the small number is a section switch with a small number in the section switches at two ends of the voltage-loss bus, otherwise, switching on a section switch connected with a main transformer-down switch with a small load rate after the section switch switching-on delay set value, and the section switch connected with the main transformer-down switch with the small load rate is a section switch connected with the main transformer-down switch with a small load rate in the section switches at two ends of the voltage-loss bus;
s2: judging whether the closed section switch is in a closed position, if so, executing step S3, otherwise, executing step S4;
s3: judging whether the voltage of the voltage-loss bus is recovered, if so, successfully switching the section switch backup power automatic switch, and if not, executing the step S4;
s4: closing the other section switch of the section switches at the two ends of the voltage-loss bus, judging whether the other section switch is in a closed position, and if so, executing the step S5;
s5: and judging whether the voltage of the voltage-loss bus is recovered, if so, successfully switching the sectional switch backup power automatic switch.
4. The method for sectionally performing automatic power switching on a 10kV bus according to claim 1, wherein the automatic power switching on and off is performed when a sectionalizing switch simultaneously meets all conditions in charging conditions, and the charging conditions specifically include:
the hard pressing plate with the sectional spare power automatic switching function of the sectional switch is switched;
the sectional spare power automatic switching function soft pressing plate of the sectional switch is switched;
the sectional spare power automatic switching mode of the sectional switch controls the character switching;
the section switch is in a sub position;
and the three-phase voltage of the buses at the two ends connected with the section switch is greater than or equal to the voltage fixed value of the buses.
5. The method for sectionally performing the automatic backup power switching of the 10kV bus according to claim 3, wherein the automatic backup power switching discharge is performed when a sectionalizing switch meets any one of discharge conditions, and the automatic backup power switching discharge performed when the sectionalizing switch meets any one of the discharge conditions specifically comprises:
discharging immediately after a spare power automatic switching function pressing plate of the section switch is withdrawn, wherein the function pressing plate comprises a hard pressing plate and a soft pressing plate;
the section switch is turned into an on position and discharges after a discharge delay fixed time;
when the spare power automatic switching device is not started, the main power supply low-change switch discharges immediately after the position signal is switched from 1 → 0 or the hand jump signal is switched from 0 → 1 without manual reset;
when the spare power automatic switching is not started, when three main transformers supply three-section buses, the main power supply low-change switch backup protection action blocking signals are immediately discharged by the spare power automatic switching of two section switches connected after 0 → 1, and manual resetting is not needed;
when the spare power automatic switching is not started, when the two main transformers supply power to the three-section bus, the main power supply low-shifting switch backup protection action blocking signal is immediately discharged after 0 → 1 and when the current of the on-position sectional switch is greater than a setting value, the sectional spare power automatic switching of the first sequence position-dividing sectional switch does not need manual resetting;
the section switch discharges immediately after receiving an external blocking 1 signal and needs manual resetting;
discharging immediately after receiving the external latch 2 signal, and automatically recharging to judge the external latch 2 signal after the signal disappears;
the PT three-phase disconnection occurs on any section of bus, and the section switch discharges immediately;
and when two sections of buses connected with the section switch are subjected to PT three-phase disconnection, the section switch immediately discharges.
6. The method for the sectionalized automatic power switching of the 10kV bus according to claim 1, wherein the switching value specifically comprises:
the switching position, the post-closing position or the hand-jumping signal and the backup protection action locking signal of the first main transformer low-level switch;
the switch position, the closed position or the hand trip signal of the second main transformer low-level switch and the backup protection action locking signal;
the switch position, the closed position or the hand trip signal of the third main transformer low-change switch and the backup protection action blocking signal;
the switch position of the first section switch, the switch position of the second section switch and the switch position of the third section switch;
the position of a functional pressure plate of the first section switch backup power automatic switch, the position of a functional pressure plate of the second section switch backup power automatic switch, the position of a functional pressure plate of the third section switch backup power automatic switch and the position of a maintenance pressure plate.
7. The method for the sectionalized automatic power switching of the 10kV bus according to claim 1, wherein the analog quantity specifically comprises:
the three-phase current of the first main transformer low-voltage switch and the voltage of the first bus;
the three-phase current of the second main transformer low-voltage switch and the voltage of the second bus;
the three-phase current of the third main transformer low-voltage switch and the voltage of the third bus;
the three-phase current of the first section switch, the three-phase current of the second section switch and the three-phase current of the third section switch.
8. The segmented spare power automatic switching device of the single-bus three-segmented ring shape is characterized by comprising a processor and a memory:
the memory is used for storing a computer program and sending instructions of the computer program to the processor;
the processor executes the sectional spare power automatic switching method of the 10kV bus according to the instructions of the computer program, wherein the method is as defined in any one of claims 1 to 7.
9. A computer-readable storage medium, wherein the computer-readable storage medium has stored thereon a computer program, which when executed by a processor, implements a method for sectionalized automatic power transfer for a 10kV bus as recited in any one of claims 1-7.
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