WO2012165779A2 - Système d'alimentation sans coupure pour installations électriques d'un grand bâtiment - Google Patents

Système d'alimentation sans coupure pour installations électriques d'un grand bâtiment Download PDF

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Publication number
WO2012165779A2
WO2012165779A2 PCT/KR2012/003823 KR2012003823W WO2012165779A2 WO 2012165779 A2 WO2012165779 A2 WO 2012165779A2 KR 2012003823 W KR2012003823 W KR 2012003823W WO 2012165779 A2 WO2012165779 A2 WO 2012165779A2
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WO
WIPO (PCT)
Prior art keywords
load
voltage
transformer
risk
facility
Prior art date
Application number
PCT/KR2012/003823
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English (en)
Korean (ko)
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WO2012165779A3 (fr
Inventor
박경선
Original Assignee
Park Kyung Sun
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Park Kyung Sun filed Critical Park Kyung Sun
Publication of WO2012165779A2 publication Critical patent/WO2012165779A2/fr
Publication of WO2012165779A3 publication Critical patent/WO2012165779A3/fr

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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
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • 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
    • Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02B90/20—Smart grids as enabling technology in buildings sector
    • 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
    • Y04S20/12—Energy storage units, uninterruptible power supply [UPS] systems or standby or emergency generators, e.g. in the last power distribution stages

Definitions

  • the present invention relates to an uninterruptible system for large-scale building electrical equipment, and more specifically, to separate and operate a low-risk (100V or more and 700V or less) load facility and a high-risk (700V or more and 7,000V or less) load facility and inspect and maintain the facility. In case of legal inspection or accident, it provides uninterrupted power without stopping operation of facilities in the building so that it can be integrated and operated at the same time.
  • the present invention relates to a large-scale uninterruptible electrical system for large-scale building electrical equipment, which is divided into a load facility having a low risk risk and a load facility having a high risk, and is able to flexibly perform power operation and capacity increase and decrease in the electric load facility.
  • the power supply system can be divided into the power equipment of the electricity supplier and the power equipment of the consumer, and the power equipment of the electricity supplier is improved in reliability by the advancement of power flow control technology, ultra-high voltage transmission technology, and system operation technology.
  • the power equipment of the electricity supplier is improved in reliability by the advancement of power flow control technology, ultra-high voltage transmission technology, and system operation technology.
  • the genius, unforeseen accidents, breakdown of the power system, breakdown / repair of the power supply, uninterruptible power supply is known to be very difficult.
  • Advanced large-scale workplaces such as semiconductor manufacturing plants, chemical plants, computer centers, general hospitals with important medical devices, and consumer facilities such as water supply and faucet facilities require uninterrupted power supply.
  • consumer facilities such as water supply and faucet facilities require uninterrupted power supply.
  • the power receiving equipment is generally installed and operated in one customer, and is not operated according to the customer's load facility.
  • the load since the low risk load facility and the high risk load facility are connected to the load of one faucet facility, the load may not be properly distributed depending on the facility and the entire power failure may occur depending on the load. There was.
  • low-risk load facilities are facilities such as lighting, which is mandatory for 24 hours
  • high-risk load facilities are facilities that are operated as needed, such as motors. Power outages may occur, and the entire building may be blackouted.
  • an object of the present invention is to solve the above problems, the transmission and distribution (power transmission and power distribution) from substation and power distribution (substation and power distribution) of different systems (hereinafter referred to as "substation”).
  • substation substation and power distribution
  • Another object of the present invention is to separate and operate the electric load facility of the customer into an annual load facility, a season load facility, an uninterruptible load facility and an electrostatic load facility, a load facility with a low risk risk and a load facility with a high risk.
  • the purpose is to flexibly perform power operation and capacity increase.
  • the first circuit breaker 120 and the second circuit breaker 220 for blocking the voltage supplied by installing between the first automatic load switchgear and the second automatic load switchgear and the low-risk faucet facility and the high-risk faucet facility Wow;
  • MOF transformer transformer current transformer
  • a first transformer 150 and a second transformer 250 installed between the third circuit breaker, the fourth circuit breaker, the fifth circuit breaker and the sixth circuit breaker to convert the primary side voltage to a low voltage;
  • a fifth circuit breaker (160) and a sixth circuit breaker (260) which are installed at the output side of the first transformer and the second transformer to cut off the supplied voltage;
  • the tie breaker 300 installed at the output side of the fifth circuit breaker and the sixth circuit breaker, and cuts off when the same voltage is supplied to both sides, and supplies a voltage to a place where the voltage is not supplied to one side. ;
  • a third transformer 170 installed at the output side of the fifth circuit breaker to convert the primary voltage to a low voltage
  • a seventh circuit breaker (180) which is installed at the output side of the third transformer and cuts off the supplied voltage
  • a low risk load facility (190) installed on the output side of the seventh circuit breaker
  • the low-power load facility and the high-risk load facility are normally operated separately from the consumer power facility that is transmitted or distributed from substations and distribution stations of different systems, and the building can be integrated for inspection, maintenance, legal inspection or accidents.
  • By providing power to the uninterrupted state without stopping the operation of the installation it provides an effect that can prevent the economic damage caused by the power failure in advance.
  • the customer's electric load equipment includes annual load equipment, seasonal load equipment, low risk load equipment, high risk load equipment (especially non-static load equipment, electrostatic load equipment, low-risk load equipment, large load equipment, etc.). It can be subdivided into two parts.) Electric load equipment (low risk load facility or annual load facility) that consumes less power by operating separately and seasonal electric load facility (high risk load facility or season load facility) that consumes a lot of power. The power can be separated and operated so that the electric load can be properly distributed, thus providing a better effect of performing the power operation more flexibly.
  • the main power equipment can be rested during the non-use period, or can be used interchangeably to prevent energy loss due to the equipment rest.
  • FIG. 1 is an overall configuration diagram of a large building electrical equipment uninterruptible system according to a preferred embodiment of the present invention.
  • FIG. 2 is an overall configuration diagram of a large building electrical equipment uninterruptible system according to another embodiment of the present invention.
  • FIG. 3 is an overall configuration diagram of a large building electrical equipment uninterruptible system according to another embodiment of the present invention.
  • the first circuit breaker 120 and the second circuit breaker 220 for blocking the voltage supplied by installing between the first automatic load switchgear and the second automatic load switchgear and the low-risk faucet facility and the high-risk faucet facility Wow;
  • MOF transformer transformer current transformer
  • a first transformer 150 and a second transformer 250 installed between the third circuit breaker, the fourth circuit breaker, the fifth circuit breaker and the sixth circuit breaker to convert the primary side voltage to a low voltage;
  • a fifth circuit breaker (160) and a sixth circuit breaker (260) which are installed at the output side of the first transformer and the second transformer to cut off the supplied voltage;
  • the tie breaker 300 installed at the output side of the fifth circuit breaker and the sixth circuit breaker, and cuts off when the same voltage is supplied to both sides, and supplies a voltage to a place where the voltage is not supplied to one side. ;
  • a third transformer 170 installed at the output side of the fifth circuit breaker to convert the primary voltage to a low voltage
  • a seventh circuit breaker (180) which is installed at the output side of the third transformer and cuts off the supplied voltage
  • a low risk load facility (190) installed on the output side of the seventh circuit breaker
  • An annual load transformer 175 installed on the output side of the fifth circuit breaker and converting the primary voltage to a low voltage to supply the annual load facility;
  • a year-load load circuit breaker (185) configured to block the voltage supplied by being installed at the output side of the year-load load transformer;
  • a yearly load facility 195 installed on the output side of the yearly load breaker
  • a season load transformer 255 installed at the output side of the fourth circuit breaker to convert the primary side voltage to a low voltage and supply it to the season load facility;
  • a season load circuit breaker 265 installed at the output side of the season load transformer to cut off a voltage supplied thereto;
  • It is characterized in that it further comprises; a season load facility (295) installed on the output side of the season load breaker.
  • the first transformer 150, the second transformer 250 and the season load transformer 255 At this time, the first transformer 150, the second transformer 250 and the season load transformer 255,
  • the voltage is switched when the power outage to receive the voltage transmitted and distributed from the other substation to the high-risk faucet facility
  • the large building electrical equipment uninterruptible system configured to include; a second automatic load switching switch 210 to
  • the first circuit breaker 120 and the second circuit breaker 220 are connected to cut off the supplied voltage and ;
  • MOF transformer transformer current transformer
  • a first transformer 150 and a second transformer 250 installed between the third circuit breaker, the fourth circuit breaker, the fifth circuit breaker and the sixth circuit breaker to convert the primary side voltage to a low voltage;
  • a fifth circuit breaker (160) and a sixth circuit breaker (260) which are installed at the output side of the first transformer and the second transformer to cut off the supplied voltage;
  • the tie breaker 300 installed at the output side of the fifth circuit breaker and the sixth circuit breaker, and cuts off when the same voltage is supplied to both sides, and supplies a voltage to a place where the voltage is not supplied to one side. ;
  • a third transformer 170 installed at the output side of the fifth circuit breaker to convert the primary voltage to a low voltage
  • a seventh circuit breaker (180) which is installed at the output side of the third transformer and cuts off the supplied voltage
  • a low risk load facility (190) installed on the output side of the seventh circuit breaker
  • FIG. 1 is an overall configuration diagram of a large building electrical equipment uninterruptible system according to a preferred embodiment of the present invention.
  • the first circuit breaker 120 and the second circuit breaker 220 for blocking the voltage supplied by installing between the first automatic load switchgear and the second automatic load switchgear and the low-risk faucet facility and the high-risk faucet facility Wow;
  • MOF transformer transformer current transformer
  • a first transformer 150 and a second transformer 250 installed between the third circuit breaker, the fourth circuit breaker, the fifth circuit breaker and the sixth circuit breaker to convert the primary side voltage to a low voltage;
  • a fifth circuit breaker (160) and a sixth circuit breaker (260) which are installed at the output side of the first transformer and the second transformer to cut off the supplied voltage;
  • the tie breaker 300 installed at the output side of the fifth circuit breaker and the sixth circuit breaker, and cuts off when the same voltage is supplied to both sides, and supplies a voltage to a place where the voltage is not supplied to one side. ;
  • a third transformer 170 installed at the output side of the fifth circuit breaker to convert the primary voltage to a low voltage
  • a seventh circuit breaker (180) which is installed at the output side of the third transformer and cuts off the supplied voltage
  • a low risk load facility (190) installed on the output side of the seventh circuit breaker
  • the tie breaker 300 is connected to the output side of the fifth breaker and the sixth breaker to disconnect the connection as necessary.
  • power load facilities are divided into low risk load facilities and high risk load facilities, respectively, and configured in each automatic load transfer switch.
  • the first automatic load switching switch 110 selects at least one of voltages transmitted and distributed from the first substation and the second substation and receives the low-risk power receiving facility, and the received voltage is switched at the time of power failure to switch to another substation.
  • the voltage transmitted and received from the power supply to the low-risk faucet facility selects at least one of the voltage transmitted and distributed from the first substation and the second substation to the high-risk faucet facility.
  • the power received and the received voltage is switched at the time of power failure to receive the voltage transmitted and distributed from other substations to the high-risk power receiving facility.
  • the first automatic load switchgear 110 and the second automatic load switchgear 210 respectively transmit / discharge voltages from the first substation 100 and the second substation 200 to the first port IP1. Input is separated into and second port (IP2).
  • the first substation and the second substation are operated by different utilities and should not be interrupted at the same time.
  • the transmission and distribution voltage is 154 / 22KV.
  • the common terminal CP of the first automatic load switching switch 110 and the second automatic load switching switch 210 is connected to the primary sides of the first circuit breaker 120 and the second circuit breaker 220, respectively.
  • LRPF low power receiving facilities
  • HPRF high power receiving facilities
  • the low-risk faucet facility 130 and the high-risk faucet facility 230 is configured to include a transformer transformer current transformer (MOF), respectively.
  • MOF transformer transformer current transformer
  • the primary side voltage and the secondary side voltage of the low-risk faucet and the high-risk faucet may be designed according to the power required by the power transmission and distribution voltage and the power reception of the present invention.
  • a third circuit breaker 140 and a fourth circuit breaker 240 are installed on the output side of the low risk power receiver and the high risk power receiver.
  • the reason for the separation operation as described above is to prevent an accidental power failure by switching directly from the automatic load transfer switch when a problem occurs in any one of the two substations.
  • the reason why the breakers are installed on the primary side and the secondary side of the low-risk faucet facility and the high-risk faucet facility, respectively, is that the faucet facilities are frequently broken. If possible, the primary and secondary sides of a particular facility are shut off and then checked and replaced.
  • the first circuit breaker and the third circuit breaker is operated to cut off the supply voltage.
  • the voltage transformed from the second transformer is supplied to the third transformer through the tie switch 300, and the low voltage transformed through the third transformer is low-risk load facility. To be supplied.
  • the high risk load facility may check the high risk faucet facility by shutting off the second breaker and the fourth breaker similarly to the above-described method, and in this case, the voltage transformed by the first transformer is passed through the tie breaker. It is supplied to the facility.
  • the power receiving facility can be checked while supplying voltage to the load facility.
  • the tie breaker 300 is installed on the output side of the fifth circuit breaker and the sixth circuit breaker to cut off when the same voltage is supplied to both sides, to supply the voltage to the place that is not supplied when the voltage is not supplied to one side do.
  • the third transformer is installed on the upper side of the low-risk load equipment and is more than 7KV. It is transformed to low voltage.
  • the voltage is transformed to less than 700V through the third transformer to supply the voltage to the low-risk load facility.
  • a fifth circuit breaker and a sixth circuit breaker are installed at the output side of the first transformer and the second transformer, and a third transformer is installed at the output side of the fifth circuit breaker to transform the voltage to a lower voltage.
  • the 7th circuit breaker is installed on the output side of the circuit breaker and the low risk load equipment is installed on the output side of the 7th circuit breaker.
  • a high risk load facility is installed on the output side of the sixth circuit breaker.
  • the reason why the circuit breaker is installed between the power receiving facility, the transformer, and the load facilities is to prepare for an accident by blocking the input side and the output side during the facility inspection.
  • the first transformer and the second transformer for example, to transform the voltage below 25KV to 7KV, the third transformer to transform 7KV or less to 700V or less, 700V passed through the third transformer is supplied to low-risk load equipment
  • less than 7KV through the second transformer has a structure that is supplied to the high risk load facility.
  • the first automatic load switching switch and the second automatic load switching switch are configured to remove the input port. Transfer to 2 ports (IP2) and receive the reserve power from the second substation to the low-risk faucet facility and the high-risk faucet facility.
  • low power faucet facilities (LPRF) and high risk faucet facilities are supplied with power that is separately transmitted and distributed from two independent substations of different systems, with one of the transmitted and distributed power sources being a constant power source.
  • the separate operation system of the present invention which receives power by HPRF operates an electric load facility in an uninterruptible state by supplying power by automatically switching to the power of a substation that maintains an uninterrupted state, which is automatically received when the power is always off. It can be seen that.
  • the effect will be increased when applied to a building that can not operate power outages that are open 24 hours, such as large hotels or hospitals.
  • FIG. 2 is an exemplary view illustrating an example in which a low risk power receiving facility and a high risk power receiving facility are connected to each other in a group, and in which a plurality of groups are connected to each other by connecting the tie breakers between the groups.
  • One automatic load switchgear and a plurality of second automatic load switchgears are configured, and a plurality of lower load switchers are configured in the same way.
  • FIG. 3 is an overall configuration diagram of a large building electrical equipment uninterruptible system according to another embodiment of the present invention.
  • An annual load transformer 175 installed on the output side of the fifth circuit breaker and converting the primary voltage to a low voltage to supply the annual load facility;
  • a year-load load circuit breaker (185) configured to block the voltage supplied by being installed at the output side of the year-load load transformer;
  • a yearly load facility 195 installed on the output side of the yearly load breaker
  • a season load transformer 255 installed at the output side of the fourth circuit breaker to convert the primary side voltage to a low voltage and supply it to the season load facility;
  • a season load circuit breaker 265 installed at the output side of the season load transformer to cut off a voltage supplied thereto;
  • It is configured to further include; a season load facility (295) installed on the output side of the season load breaker.
  • the difference from one embodiment is that the year-load load transformer and the season load transformer are installed on the secondary side of the fifth breaker and the fourth breaker, respectively, and the year-load load breaker and the secondary load transformer are installed on the secondary side of the year-load load transformer and the season load transformer.
  • the annual load is a facility of 700V or less as a power failure is not possible, for example, it means the main equipment such as lighting, emergency power, computing, communication, automation equipment, elevator equipment.
  • season load is a facility capable of power failure, for example, means a general power, cooling or heating equipment.
  • the low risk load facility means a load facility using 700V or less
  • the high risk load facility means a load facility using a high voltage of 7,000V or less, such as a refrigerator.
  • the voltage standard should be unified in accordance with domestic regulations.
  • consumer power equipment that transmits or distributes power to and receives power from substations and distribution stations of different systems is normally operated by separating low-risk load facilities and high-risk load facilities, and inspecting, maintaining, and legally inspecting the facilities.
  • power can be supplied in an uninterrupted state without stopping operation of facilities in the building, thereby providing an effect of preventing economic damage caused by a power failure.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Stand-By Power Supply Arrangements (AREA)

Abstract

La présente invention concerne un système d'alimentation sans coupure pour installations électriques d'un grand bâtiment. Plus particulièrement, le système d'alimentation sans coupure fonctionne, dans des circonstances normales, de manière séparée pour une installation de charge à faible risque (tension supérieure à 100 V et inférieure à 700 V) et pour une installation de charge à risque élevé (tension supérieure à 700 V et inférieure à 7 000 V). En outre, lorsque les installations sont vérifiées ou réparées, ou lors de la réalisation d'une inspection réglementaire, ou lorsque se produit un accident, un fonctionnement intégré est activé de façon à ce que le système d'alimentation sans coupure fournisse de l'électricité dans un état d'alimentation sans coupure sans arrêter le fonctionnement des installations dans le bâtiment. Simultanément, une installation de charge d'électricité client est mise en fonctionnement séparément en tant qu'installation de charge pour l'année ou en tant qu'installation de charge saisonnière, en tant qu'installation de charge à alimentation sans coupure ou en tant qu'installation de charge à alimentation avec coupure, et en tant qu'installation de charge à faible risque ou en tant qu'installation de charge à risque élevé. Ainsi, le système d'alimentation sans coupure pour installations électriques peut être utilisé de manière souple en fonction des types d'alimentation des installations de charge d'électricité et augmente la capacité des installations. Selon la présente invention, l'installation d'électricité client recevant l'électricité transmise ou distribuée à partir de différentes sous-stations et de différentes stations de distribution peut, dans des circonstances normales, être mise en fonctionnement de manière séparée en tant qu'installation de charge à faible risque ou en tant qu'installation de charge à risque élevé. En outre, lorsque les installations sont vérifiées ou réparées, lors de la réalisation d'une inspection réglementaire, ou lorsque se produit un accident, un fonctionnement intégré est activé de façon à ce que le système d'alimentation sans coupure fournisse de l'électricité dans un état d'alimentation sans coupure sans arrêter le fonctionnement des installations dans le bâtiment. Il est ainsi possible d'empêcher un préjudice économique dû à une interruption d'alimentation.
PCT/KR2012/003823 2011-05-27 2012-05-16 Système d'alimentation sans coupure pour installations électriques d'un grand bâtiment WO2012165779A2 (fr)

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KR1020110050949A KR101067594B1 (ko) 2011-05-27 2011-05-27 대형빌딩 전기설비 무정전시스템
KR10-2011-0050949 2011-05-27

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WO2012165779A2 true WO2012165779A2 (fr) 2012-12-06
WO2012165779A3 WO2012165779A3 (fr) 2013-02-21

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CN113078730A (zh) * 2021-03-31 2021-07-06 王文林 一种电网设备工作状态的定期切换方法

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KR101375746B1 (ko) * 2013-12-11 2014-03-19 김수성 블랙아웃 방지 및 피크전력 제어를 위한 수용가 전력계통 이중화 시스템 및 그 전력 공급 방법
CN104104017B (zh) * 2014-07-21 2016-09-28 安徽鑫辰电气设备有限公司 一种具有备用电源的变电柜
KR101658705B1 (ko) * 2014-10-06 2016-09-22 나인규 무정전 2모선수변전설비

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JPH1066261A (ja) * 1996-08-22 1998-03-06 Toshiba Corp 配電線自動ループ切替装置及びその方法
KR20080079596A (ko) * 2007-02-27 2008-09-01 에스엠에이 솔라 테크놀로지 아게 백업 전원시스템
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JPH1066261A (ja) * 1996-08-22 1998-03-06 Toshiba Corp 配電線自動ループ切替装置及びその方法
KR20080079596A (ko) * 2007-02-27 2008-09-01 에스엠에이 솔라 테크놀로지 아게 백업 전원시스템
JP2009189084A (ja) * 2008-02-01 2009-08-20 Chugoku Electric Power Co Inc:The 配電システム
KR20110014087A (ko) * 2009-08-03 2011-02-10 박경선 수용가 전력설비 분리운영시스템

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113078730A (zh) * 2021-03-31 2021-07-06 王文林 一种电网设备工作状态的定期切换方法
CN113078730B (zh) * 2021-03-31 2024-01-30 王文林 一种电网设备工作状态的定期切换方法

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WO2012165779A3 (fr) 2013-02-21

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