CN107171323B - Rail transit loop medium-voltage network power supply system and operation method thereof - Google Patents
Rail transit loop medium-voltage network power supply system and operation method thereof Download PDFInfo
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- CN107171323B CN107171323B CN201710502574.2A CN201710502574A CN107171323B CN 107171323 B CN107171323 B CN 107171323B CN 201710502574 A CN201710502574 A CN 201710502574A CN 107171323 B CN107171323 B CN 107171323B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
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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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- 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
Abstract
The invention relates to a power supply system of a medium-voltage network of a track traffic loop, and provides a power supply system of a medium-voltage network of a track traffic loop, which comprises a plurality of main substations and a plurality of power supply partitions distributed along the loop, wherein each power supply partition comprises a plurality of substations distributed along the loop in sequence, each power supply partition is connected with two power supplies from one main substation to one substation in the partition, the plurality of substations in each power supply partition are connected in series in sequence through a first group of interval cables and a second group of interval cables, two substations at the end parts of two adjacent power supply partitions are connected through a looped network cable, and a looped network section switch is arranged on the looped network cable. The medium-voltage network power supply system for the rail transit loop provided by the invention utilizes the characteristics of the loop, is simpler in connection, less in secondary loop, strong in engineering feasibility and more convenient in operation management on the premise of meeting the safety and reliability.
Description
Technical Field
The invention relates to a medium-voltage network power supply system for rail transit, in particular to a medium-voltage network power supply system for a rail transit loop.
Background
The medium-voltage network power supply system of the urban rail transit loop line built in recent years in China continues the wiring scheme of the linear line, and adopts a double-loop network structure and an open-loop operation mode. The power supply subareas are arranged on the whole line, each subarea leads two loops of power supplies from an external power supply or a main substation to two sections of buses of a first substation of the subarea, and the substations in the subareas are connected by adopting double-loop cable circuits; the substation adopts single bus sectional wiring, a bus tie switch is arranged, and a standby power source automatic switching function is arranged at the bus tie switch; in order to provide fault support capability, a connection cable and a looped network section switch are arranged at the tail part of a subarea between power supply points. When the ring network sectional switch is normally operated, the ring network sectional switch is opened, and when one power return source loses power, the bus tie switch is closed, and the other power return source supports power supply; when one external power supply (two-loop power supply) loses power, the looped network section switch is closed, and the other external power supply is used for supporting power supply. The wiring scheme has strong advantages aiming at the line type running through the city in the city, namely, the wiring scheme can meet the requirement that each substation has two independent power supplies in power supply partitions at two ends of the line, and avoids circuitous power supply. But the characteristic of a loop line is not combined for targeted design, the wiring and operation mode of a substation is complex, the engineering implementation and operation management are inconvenient, and the economic index is poor.
Therefore, there is a need to design a medium voltage network power supply system for rail transit loop to overcome the above problems.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a track traffic loop medium-voltage power supply system, which is purposefully designed according to the characteristics of a loop, so that the medium-voltage network power supply system is simpler in connection and less in secondary loop on the premise of meeting the safety and reliability, and is obviously superior to the existing scheme in the aspects of economy, engineering feasibility, operation management convenience, operation method simplicity and the like.
The invention is realized by the following steps:
the invention provides a rail transit loop medium-voltage network power supply system which comprises a plurality of main substations and a plurality of power supply subareas, wherein the power supply subareas are distributed along a loop, each power supply subarea comprises a plurality of substations which are sequentially distributed along the loop, each power supply subarea is connected with two loops of power supplies from one main substation to one substation in the subarea, each substation comprises two sections of buses, the two sections of buses are respectively a first bus and a second bus, each section of bus is provided with an incoming line and an outgoing line, the first buses of the substations in each power supply subarea are sequentially connected in series through a first group of interval cables, the second buses of the substations in each power supply subarea are sequentially connected in series through a second group of interval cables, the substation at the end of each power supply subarea is an end substation, two adjacent end substations are connected through two loops of cables, and each loop subsection switches are arranged on each loop cable.
Furthermore, each section of bus is provided with a grounding switch.
Furthermore, each power supply partition is connected with two power supplies from a main power substation through two main transformers, and the two main transformers are connected through a bus-coupled sectional switch.
Furthermore, a safety automatic switching device is arranged at each looped network section switch.
Furthermore, the safety automatic switching device comprises a spare automatic switching logic circuit and a spare power supply, the spare automatic switching logic circuit comprises a two-input AND gate, a three-input AND gate, a two-input OR gate, a first NOT gate, a second NOT gate and a relay, any bus of the end part substation is an end part bus, a ring network section switch connected with the end part bus is an end part ring network section switch, and an incoming line of the end part bus and an outgoing line of the end part bus are both connected with input ends of the two-input OR gates; the incoming line of the end part bus and the end part bus are both connected with the input ends of the two input AND gates; the output ends of the two input AND gates are connected with a first NOT gate, and a terminal bus is connected with a second NOT gate; the output ends of the two input OR gates, the output end of the first NOT gate and the output end of the second NOT gate are connected with the input end of the three input AND gate; the output end of the three-input AND gate is connected with a relay, the relay is connected with an end part looped network section switch, and the end part looped network section switch is connected with a standby power supply.
The invention also provides an operation method based on the rail transit loop medium-voltage network power supply system, when in normal operation, all the looped network section switches are turned on, and each main substation provides power for all power supply subareas in the power supply range; when one loop network cable in any power supply subarea loses power, the other loop network cable still provides a power return source by the main power transformer connected with the power supply subarea, the loop network section switch connected with the loop network cable losing power is closed, and the other loop network cable losing power is provided with a power return source by the other main power transformer.
Furthermore, in any power supply subarea, when one main transformer quits operation, the bus-coupled section switch between the two main transformers in the power supply subarea is closed, and the other main transformer provides power for all substations in the power supply subarea power supply range.
Further, when one main substation is disconnected, the ring network section switches on all the power supply sections in the power supply range of the main substation are closed, and the other main substation provides power for all the power supply sections in the power supply range of the main substation and all the power supply sections in the power supply range of the other main substation.
Furthermore, each substation is powered by the incoming line of the first bus of the substation and the incoming line of the second bus of the substation.
Further, when the voltage of the incoming line side of the end bus is lost or the voltage of the outgoing line side of the end bus is lost, the incoming line side and the end bus side of the end bus are not simultaneously pressureless, and the end bus does not have a fault, the spare power automatic switching logic circuit is started, the relay is started in a delayed mode, the end ring network section switch is closed accordingly, and the spare power supply is put into use.
The invention has the following beneficial effects:
1. on the premise of meeting the safety and reliability, the connection of a medium-voltage network and a substation is simpler, the locking logic is simplified, the secondary circuit is fewer, and the operation mode of the whole power supply system is simpler.
2. The optimization and simplification of the wiring scheme reduce equipment of the substation, so that the construction cost, the operation cost and the maintenance cost are all reduced.
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, 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 the drawings without creative efforts.
Fig. 1 is a medium voltage network wiring diagram of a medium voltage network power supply system of a rail transit loop according to an embodiment of the present invention;
FIG. 2 is a wiring diagram of a substation of the medium voltage network power supply system of the rail transit loop provided in FIG. 1;
fig. 3 is a diagram for analyzing the configuration and operation of a safety robot of a medium voltage network power supply system of a rail transit loop provided in fig. 1;
fig. 4 is a backup power automatic switching logic circuit diagram of the medium voltage network power supply system of the rail transit loop provided in fig. 1.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
The first embodiment: as shown in fig. 1-2, an embodiment of the present invention provides a medium-voltage network power supply system for a rail transit loop, including a main substation S1 and a main substation S2, where the entire rail transit loop is divided into four power supply partitions: the power supply system comprises a first power supply subarea Q1, a second power supply subarea Q2, a third power supply subarea Q3 and a fourth power supply subarea Q4, wherein the four power supply subareas comprise a plurality of power substations SS which are distributed in sequence along a rail transit loop. The first power supply subarea Q1 is connected with two power supplies from the main substation S1 to the first substation SS1 in the main substation Q1, the second power supply subarea Q2 is connected with two power supplies from the main substation S1 to the first substation SS2 in the main substation Q2, the third power supply subarea Q3 is connected with two power supplies from the main substation S2 to the first substation SS3 in the main substation Q3, and the fourth power supply subarea Q4 is connected with two power supplies from the main substation S2 to the first substation SS4 in the main substation Q4. Each substation SS comprises a first bus M1 and a second bus M2, a return incoming line JX1 and a return outgoing line CX1 are arranged on the first bus M1, and a return incoming line JX2 and a return outgoing line CX2 are arranged on the second bus M2. The first buses M1 of a plurality of substations SS in each power supply subarea are sequentially connected in series through a first group of interval cables L1, the second buses M2 of adjacent substations SS in each power supply subarea are sequentially connected in series through a second group of interval cables L2, the substation SSa of the first power supply subarea Q1 at the end part and the substation SSd of the fourth power supply subarea Q4 at the end part are connected through a two-loop ring network cable HL, the substation SSb of the second power supply subarea Q2 at the end part and the substation SSc of the third power supply subarea Q3 at the end part are connected through a two-loop ring network cable HL, and each power supply subarea is connected through a two-loop ring network cable HLA looped network section switch HK is arranged on the looped network cable HL. When the medium-voltage network power supply system of the rail transit loop line provided by the embodiment of the invention is in normal operation, the looped network section switch HK is positioned in a separated position, and each main substation provides power for two power supply subareas in the power supply range of the substation. When one main substation is disconnected, 4 looped network section switches HK are closed, and the other main substation provides power for full-line primary and secondary loads. When the transformer substation SS is in normal operation, two sections of buses of each transformer substation SS are respectively provided with power supplies through incoming lines JX1 and JX2, when any incoming line loses power, the looped network section switch HK is closed, and the power supply of the other section provides power for the section of bus. Compared with a common power supply system, the power supply system provided by the invention is characterized in that a bus tie switch is not arranged between two sections of buses of the substation, when one section of bus of one substation is in power failure, the power supply is not supported by closing the bus tie switch, but the power supply is supported by closing a looped network section switch, and the wiring scheme meets the requirement that each substation has two independent power supplies specified by a primary load standard according to the characteristics of a looped line, so that the wiring scheme fully utilizes the characteristics of the looped line and improves the wiring scheme of a medium-voltage network power supply system of the looped line of the rail transit. The improved wiring scheme is simpler, the secondary loop is less, the locking logic is simplified, and the operation mode is simpler. The operation cost can be reduced, 2 isolating switches, 2 surfaces of the inflatable cabinet body and 1 set of the microcomputer comprehensive protection device can be reduced for each substation; meanwhile, the area of each substation is directly reduced by about 6m 2 And each substation saves about 40 ten thousand yuan of RMB.
Second embodiment: preferably, as shown in fig. 2, each section of the bus bar is provided with a grounding switch 1. The grounding switch is beneficial to improving the safety of the whole power supply system.
The third embodiment: preferably, as shown in fig. 1, each of the power supply partitions introduces two power supplies from a main power substation through two main transformers 2, and the two main transformers 2 are connected through a bus-coupled section switch. When one main transformer is out of operation, the bus-coupled section switch is closed, and the other main transformer provides power for two power supply subareas in the power supply range of the main substation.
The fourth embodiment: preferably, as shown in fig. 3, a safety automatic switching device is arranged at each looped network section switch HK. Compared with the prior art, the embodiment of the invention has the difference that the safety automatic switching device is only arranged at the ring network subsection, thereby saving the engineering investment while realizing the safety automatic switching function.
Fifth embodiment: preferably, as shown in fig. 3 to 4, a safety automatic switching device and a looped network section switch HK101 are arranged between the substation 4 and the substation 5, the safety automatic switching device includes a backup automatic switching logic circuit and a backup power supply (not shown in the figure), the backup automatic switching logic circuit includes a two-input and gate, a three-input and gate, a two-input or gate, a first not gate, a second not gate and a relay, the substation 5 is an end substation, and a first bus incoming line of the substation 5 and a first bus outgoing line of the substation 5 are both connected to input ends of the two-input or gate; the first bus incoming line of the substation 5 and the first bus side of the substation 5 are both connected with the input ends of the two input AND gates; the output ends of the two input AND gates are connected with a first NOT gate, and a first bus of the substation 5 is connected with a second NOT gate; the output ends of the two input OR gates, the output end of the first NOT gate and the output end of the second NOT gate are connected with the input end of the three input AND gate; the output end of the three-input AND gate is connected with a relay, the relay is connected with a ring network section switch HK101, and the ring network section switch HK101 is connected with a standby power supply. The safety automatic switching device has the function of quickly recovering the power supply capacity of the system under the condition that one power supply is out of power. When the voltage of the inlet side of the first bus of the substation 5 is lost or the voltage of the outlet side of the first bus of the substation 5 is lost, the two input OR gates are conducted; when the line inlet side of the first bus and the first bus side are simultaneously non-voltage, the two inputs are conducted with the AND gate; when the two input OR gates are conducted, the two input AND gates are locked, and the first bus does not have a fault, the three input AND gates are conducted, the spare power automatic switching logic circuit is started, the relay is started in a delayed mode, after the relay is delayed, the ring network section switch HK101 is closed, and the spare power supply is put into use. The voltage loss of the first bus inlet side of the substation 5 or the voltage loss of the first bus outlet side of the substation 5 is a starting condition of the backup automatic switching logic circuit, the first bus inlet side and the first bus side are simultaneously free of voltage or a first bus fault of the substation 5 is a locking condition of the backup automatic switching logic circuit, and when the starting condition is met and the locking condition is not generated, the backup automatic switching logic circuit is started. The second bus of the substation 5 is also provided with a spare power automatic switching device, and the principle is the same as that of the spare power automatic switching device arranged on the first bus, and the description is omitted here. The embodiment also reduces the cost, realizes the spare power automatic switching function by utilizing the ring network section switch, can reduce 1 breaker of each substation, and saves the cost.
The embodiment also provides an operation method of the medium-voltage network power supply system of the rail transit loop based on the first embodiment, and the operation method comprises the following steps: when the power supply device normally operates, all the ring network section switches HK are turned on, and the main substation S1 and the main substation S2 provide power for the first power supply sub-area Q1, the second power supply sub-area Q2, the third power supply sub-area Q3 and the fourth power supply sub-area Q4. When any looped network cable in the first power supply partition Q1 loses power, the other looped network cable still provides a looped power source by the first main substation S1, the looped network section switch HK connected with the power-losing looped network cable is closed, and the main substation S2 provides a looped power source for the power-losing looped network cable, namely the two looped network cables in the first power supply partition Q1 are respectively provided with a looped power source by the first main substation S1 and the second main substation S2. When any loop back network cable in the second power supply partition Q2 loses power, the same analysis is performed, and details are not repeated herein. The operation method realizes the self-rescue function when the looped network cable fails on the premise of not changing the operation mode of the substation.
The operation method provided by the embodiment is different from the prior art in that a bus tie switch is not arranged between two sections of buses of the substation, and when one section of bus of one substation loses power, the power supply is not supported by closing the bus tie switch, but the power supply is supported by closing the looped network section switch. Specifically, when any return line of any substation in the first power supply partition Q1 loses power, the other return line is still provided with a return power supply by the main substation S1, the ring network section switch HK on the first power supply partition Q1 is closed, and the main substation S2 provides a return power supply for the first power supply partition, that is, the two return lines are respectively provided with a return power supply by different main substations. When any incoming line of any substation in other power supply subareas loses power, the analysis is the same, and the description is omitted here. Compared with the prior art, the operation method of the power supply system provided by the embodiment of the invention has the advantages that the characteristics of the loop are fully utilized, and the wiring scheme of the rail transit loop medium-voltage network power supply system is improved, so that the operation method meets the requirement that each substation has two independent power supplies specified by the primary load standard, and meanwhile, the operation mode is simpler. Compared with the operation method of the conventional rail transit loop medium-voltage network power supply system, the operation method provided by the embodiment avoids roundabout power supply on the premise that each substation is provided with two independent power supplies (namely two power supplies), and is simpler and more convenient in operation mode.
Preferably, the two main transformers connected to the main substation S1 are a main transformer ZY1 and a main transformer ZY2, when the main transformer ZY1 exits from operation, the bus-tie section switch between the main transformer ZY1 and the main transformer ZY2 is closed, and the main transformer ZY2 provides power for the first power supply section Q1' and the second power supply section Q2. Two independent power supplies are arranged in each substation in the power supply range of the main substation S1 through the bus-coupled section switch. One of the two main transformers connected to the main substation S2 is removed from operation, and the same analysis is performed, and details are not described herein.
Preferably, when the main substation S1 is disconnected, the two looped network section switches HK on the first power supply section Q1 and the two looped network section switches HK on the second power supply section are closed, and the main substation S2 supplies power to the first power supply section Q1, the second power supply section Q2, the third power supply section Q3 and the fourth power supply section Q4.
Preferably, each of the power substations is powered by the incoming line of the first bus M1 of the power substation and the incoming line of the second bus M2 of the power substation.
Preferably, the incoming line side of the first bus M1 of the substation 5 is a 101 side, the outgoing line side of the first bus M1 of the substation 5 is a 102 side, when the 101 side of the first bus M1 of the substation 5 is under voltage loss or the 102 side of the first bus M1 of the substation 5 is under voltage loss, and the 101 side of the first bus M1 of the substation 5 and the first bus M1 side are not under voltage simultaneously, and the first bus M1 of the substation 5 has no fault, the backup automatic switching logic circuit is started, the relay is started in a delayed manner, and after the relay is delayed, the ring network section switch HK101 is closed, and the backup power supply is put into use.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. A rail transit loop medium voltage network power supply system comprises a plurality of main substations and a plurality of power supply partitions distributed along a loop, wherein each power supply partition comprises a plurality of power substations distributed along the loop in sequence, each power supply partition is connected with two power supplies from one main substation to one power substation in the partition, and the rail transit loop medium voltage network power supply system is characterized in that: each power substation comprises two sections of buses, the two sections of buses are respectively a first bus and a second bus, each section of bus is provided with a return incoming line and a return outgoing line, the first buses of a plurality of power substations in each power supply partition are sequentially connected in series through a first group of interval cables, the second buses of a plurality of power substations in each power supply partition are sequentially connected in series through a second group of interval cables, the power substations at the end parts of the power supply partitions are end power substations, two adjacent end power substations are connected through two return ring network cables, each ring network cable is provided with a ring network sectional switch, each section of bus is provided with a grounding switch, each ring network sectional switch is provided with a safety automatic switching device, each safety automatic switching device comprises a standby power supply and a spare power supply, each standby automatic switching logic circuit comprises a two-input and gate, a three-input and gate, a two-input or gate, a first not gate, a second not gate and a relay, any bus at the end part of the power substation is an end part, the sectional switch connected with the end part of the bus is the end part of the ring network bus, and the incoming line input end part of the bus or the two bus input ends of the ring network buses connected with the input end parts of the two bus input ends of the power substations; the incoming line of the end part bus and the end part bus are both connected with the input ends of the two input AND gates; the output ends of the two input AND gates are connected with a first NOT gate, and a terminal bus is connected with a second NOT gate; the output ends of the two input OR gates, the output end of the first NOT gate and the output end of the second NOT gate are connected with the input end of the three-input AND gate; the output end of the three-input AND gate is connected with a relay, the relay is connected with an end part looped network section switch, and the end part looped network section switch is connected with a standby power supply.
2. The rail transit loop medium voltage network power supply system of claim 1, wherein: each power supply partition is connected with two power supplies from a main power substation through two main transformers, and the two main transformers are connected through a bus-coupled section switch.
3. An operating method based on a rail transit loop medium voltage network power supply system as provided in claim 1, characterized in that: when the system normally operates, all looped network section switches are turned on, and each main substation provides power for all power supply sections in the power supply range of the main substation;
when one loop network cable in any power supply subarea loses power, the other loop network cable still provides a power return source by the main power transformer connected with the power supply subarea, the loop network section switch connected with the loop network cable losing power is closed, and the other loop network cable losing power is provided with a power return source by the other main power transformer.
4. The method of operation of claim 3, wherein: when one main substation is disconnected, the looped network section switches on all the power supply subareas in the power supply range of the main substation are closed, and the other main substation provides power for all the power supply subareas in the power supply range of the main substation and all the power supply subareas in the power supply range of the other main substation.
5. The method of operation of claim 3, wherein: and each substation is powered by the inlet wire of the first bus of the substation and the inlet wire of the second bus of the substation.
6. An operating method based on a rail transit loop medium voltage network power supply system as provided in claim 1, characterized in that: when the incoming line side of the end bus is in voltage loss or the outgoing line side of the end bus is in voltage loss, the incoming line side and the end bus side of the end bus are not simultaneously in voltage loss, and the end bus does not have a fault, the standby power automatic switching logic circuit is started, the relay is started in a delayed mode, the end ring network section switch is closed accordingly, and the standby power supply is put into use.
7. An operating method based on a rail transit loop medium voltage network power supply system as provided in claim 2, characterized in that:
in any power supply subarea, when one main transformer quits operation, the bus-coupled sectional switch between the two main transformers in the power supply subarea is closed, and the other main transformer provides power for all substations in the power supply subarea power supply range.
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| CN201710502574.2A CN107171323B (en) | 2017-06-27 | 2017-06-27 | Rail transit loop medium-voltage network power supply system and operation method thereof |
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| CN108718087B (en) * | 2018-06-29 | 2020-07-24 | 成都交大许继电气有限责任公司 | Spare power automatic switching system suitable for medium-voltage power supply ring network of rail transit |
| CN110460025B (en) * | 2019-08-15 | 2021-11-23 | 国网四川省电力公司宜宾供电公司 | Quick ring-opening method and device |
| CN111562774B (en) * | 2020-07-14 | 2020-10-16 | 宝信软件(成都)有限公司 | Distributed parallel control method and system for subway network electric power SCADA |
| CN113852062A (en) * | 2021-09-08 | 2021-12-28 | 中铁二院工程集团有限责任公司 | Rail transit power supply system based on three-phase inverter power supply device |
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