CN212676028U - Wind power plant box type transformer with alternating current uninterrupted power supply - Google Patents

Wind power plant box type transformer with alternating current uninterrupted power supply Download PDF

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Publication number
CN212676028U
CN212676028U CN202021921469.6U CN202021921469U CN212676028U CN 212676028 U CN212676028 U CN 212676028U CN 202021921469 U CN202021921469 U CN 202021921469U CN 212676028 U CN212676028 U CN 212676028U
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CN
China
Prior art keywords
box
power supply
transformer
circuit breaker
branch
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Active
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CN202021921469.6U
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Chinese (zh)
Inventor
李思达
董杰
唐志军
沈石水
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Longyuan Beijing Wind Power Engineering Design and Consultation Co Ltd
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Longyuan Beijing Wind Power Engineering Design and Consultation Co Ltd
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Priority to CN202021921469.6U priority Critical patent/CN212676028U/en
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00Integration of renewable energy sources in buildings
    • Y02B10/70Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30Systems 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
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B90/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02B90/20Smart grids as enabling technology in buildings sector
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/70Wind energy
    • Y02E10/76Power conversion electric or electronic aspects
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • YGENERAL 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
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS 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
    • Y04S10/00Systems supporting electrical power generation, transmission or distribution
    • Y04S10/16Electric power substations
    • YGENERAL 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
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS 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
    • Y04S20/00Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/12Energy storage units, uninterruptible power supply [UPS] systems or standby or emergency generators, e.g. in the last power distribution stages
    • YGENERAL 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
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS 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
    • Y04S20/00Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20End-user application control systems
    • Y04S20/248UPS systems or standby or emergency generators

Abstract

The utility model discloses a take box transformer of wind-powered electricity generation field of alternating current uninterrupted power source, become the main part including box casing and the box inside the box casing become, the box becomes auxiliary power supply system, still have box and become uninterrupted power source system and box and become protection measurement and control device in the box casing, the box becomes uninterrupted power source device that has in the uninterrupted power source system, input power source, power change over switch and uninterrupted power source branch circuit breaker group, the input power source of box becomes uninterrupted power source device comes from the box and becomes auxiliary power supply system, box becomes uninterrupted power source device and inserts power change over switch, power change over switch links to each other with input power source simultaneously; the output end of the change-over switch is connected with the uninterrupted power supply branch circuit breaker group; the measurement and control signals of the main body part of the box transformer substation are accessed to the box transformer substation protection measurement and control device. The product improves the safety and reliability of the box-type transformer and realizes the remote monitoring of the box-type transformer by the operating personnel of the wind power plant.

Description

Wind power plant box type transformer with alternating current uninterrupted power supply
Technical Field
The utility model relates to a box transformer especially relates to a take box transformer of wind-powered electricity generation field of alternating current uninterrupted power source.
Background
The box-type transformer is connected with the wind turbine generator in a one-to-one unit mode and is an important component of the wind power plant. At present, a relay protection and monitoring device is not installed in a widely used conventional box type transformer, and the running state of the box type transformer cannot be uploaded to a wind power plant monitoring system, so that the box type transformer becomes a blind zone for relay protection and comprehensive automatic monitoring of the wind power plant.
Moreover, the conventional box-type transformer protection equipment adopts a fuse and a load switch, and when the box-type transformer fails, the box-type transformer cannot be cut off quickly; on the other hand, because the box-type transformer is a monitoring blind spot of the wind power plant, when a fault occurs, field operators cannot timely handle the fault, so that the fault is easily enlarged, and a large loss is caused.
In recent years, with the application of a single high-capacity wind generating set with 3.0MW and above, the requirements of the wind power plant on the reliability and the safety of a box-type transformer are gradually improved, the capacity of the box-type transformer is generally configured according to 110% of the capacity of the wind generating set, and in order to ensure the reliable operation of the wind generating set, a relay protection system must be configured and monitored in real time, so that the operation safety of the wind power plant is improved.
SUMMERY OF THE UTILITY MODEL
In order to solve the shortcomings existing in the technology, the utility model provides a box-type transformer of wind-powered electricity generation field with AC uninterrupted power source.
In order to solve the technical problem, the utility model discloses a technical scheme is: a wind power plant box type transformer with an alternating current uninterrupted power supply comprises a box type shell, a box type transformer main body part and a box type transformer auxiliary power supply system, wherein the box type transformer main body part and the box type transformer auxiliary power supply system are arranged in the box type shell; the measurement and control signals of the main body part of the box transformer substation are connected into the box transformer substation protection measurement and control device, and the box transformer substation auxiliary power supply system is connected with the box transformer substation uninterrupted power supply system.
Furthermore, the box transformer uninterruptible power supply device comprises a main loop input end isolation transformer, a bypass isolation transformer, a rectifier, a storage battery, an inverter, a main loop output end isolation transformer and a static switch, wherein an input power supply is connected with the main loop input end isolation transformer, the rectifier, the inverter, the main loop output end isolation transformer and the static switch are sequentially connected, the output end of the static switch is firstly connected with a power supply changeover switch, the input end of the main loop input end isolation transformer is connected with the static switch through the bypass isolation transformer, the positive electrode of the storage battery is connected with the positive electrode input end of the inverter, and the negative electrode of the storage battery is connected with the negative electrode input end of the inverter.
Furthermore, the uninterrupted power supply branch circuit breaker group comprises a first branch circuit breaker, a second branch circuit breaker, a third branch circuit breaker, a fourth branch circuit breaker and a fifth branch circuit breaker.
Furthermore, a first branch circuit breaker is connected with the box-type substation protection and measurement device, measurement and control signals of a 35KV isolating switch, a 35KV circuit breaker, a 35KV current transformer, a main transformer, a 1KV frame-type circuit breaker and the 1KV current transformer of the main body part of the box-type substation are connected into the box-type substation protection and measurement device, a second branch circuit breaker is connected with a control loop of the 35KV circuit breaker, a third branch circuit breaker is connected with an energy storage loop of the 35KV circuit breaker, a fourth branch circuit breaker is connected with the 1KV frame-type circuit breaker, and a fifth branch circuit breaker is connected with a live display and an electromagnetic lock in the box-.
The utility model discloses an useful part lies in: the box transformer substation protection measurement and control device is additionally arranged, continuous power supply and normal work of various main devices such as circuit breakers and the like in the box transformer are guaranteed, meanwhile, the box transformer substation uninterruptible power supply is configured in the box transformer and can still be in a monitorable state within a period of time after the main power supply of the box transformer is cut off, so that the safety and reliability of the box transformer are improved, and remote monitoring of a wind power plant operator on the box transformer substation is realized.
Drawings
Fig. 1 is a schematic block diagram of the connection of the components of the present invention.
Fig. 2 is a schematic diagram of the components and connections of the box-to-box uninterruptible power supply.
In the figure: 1. a box transformer main body part; 2. an auxiliary power supply system of the box transformer substation; 3. the box transformer substation uninterruptible power supply system; 4. the box transformer substation protection measurement and control device; 5. a charged display; 6. an electromagnetic lock; 11. 35KV isolating switch; 12. a 35KV circuit breaker; 13. 35KV current transformer; 14. a main transformer; 15. 1KV frame-type circuit breaker; 16. 1KV current transformer; 31. the box transformer substation uninterruptible power supply device; 32. inputting a power supply; 33. a power supply changeover switch; 34. an uninterruptible power supply branch circuit breaker set; 311. the input end of the main loop is provided with an isolation transformer; 312. bypassing the isolation transformer; 313. a rectifier; 314. a storage battery; 315. an inverter; 316. the output end of the main loop isolates the transformer; 317. a static switch; 341. a branch circuit breaker; 342. a branch two breaker; 343. a branch circuit three breaker; 344. a branch four circuit breaker; 345. and a branch circuit five breaker.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1 and 2, the box-type transformer with an ac ups for a wind farm comprises a box-type casing, a box-type transformer main body 1 inside the box-type casing, and a box-type transformer auxiliary power supply system 2, wherein the box-type transformer casing further comprises a box-type transformer ups system 3 and a box-type transformer protection measurement and control device 4, the box-type transformer ups system 3 comprises a box-type transformer ups device 31, an input power source 32, a power source switch 33, and an ups branch circuit breaker group 34, the box-type transformer ups device 31 is connected to the power source switch 33, the input power source 32 is directly connected to the power source switch 33, and the power source switch 33 is connected to the ups branch circuit breaker group 34; the measurement and control signals of the main body part 1 of the box transformer substation are connected into a box transformer substation protection measurement and control device 4, and the auxiliary power supply system 2 of the box transformer substation is connected with the uninterrupted power supply system 3 of the box transformer substation.
The box-type uninterruptible power supply 31, commonly known as a UPS, includes a main circuit input isolation transformer 311, a bypass isolation transformer 312, a rectifier 313, a battery 314, and an inverter 315, the main loop output end isolation transformer 316 and the static switch 317, the input power supply 32 is connected with the main loop input end isolation transformer 311, the input power supply 32 is an AC380/220V power supply and is taken from the box transformer auxiliary power supply system 2, the main loop input end isolation transformer 311, the rectifier 313, the inverter 315, the main loop output end isolation transformer 316 and the static switch 317 are sequentially connected, the output end of the static switch 317 is connected with the power supply changeover switch 33, the static switch 317 is connected with the input end of the main loop input end isolation transformer 311 through the bypass isolation transformer 312, the anode of the storage battery 314 is connected with the anode input end of the inverter 315, and the cathode of the storage battery 314 is connected with the cathode input end of the inverter 315;
the isolation transformer 311 at the input end of the main loop, the isolation transformer 316 at the output end of the main loop and the bypass isolation transformer 312 are all isolation transformers, the rectifier 313 and the inverter 315 are separated from an input power supply and a load, and the isolation transformers have the function of stabilizing voltage so as to protect the rectifier 313 and the inverter 315, 380V alternating current is converted into 220V direct current by the rectifier 313, 220V direct current is converted into 220V alternating current by the inverter 315, the storage battery 314 is used for storing electric energy, when the input power supply 32 disappears, electric energy is provided for the box transformer uninterruptible power supply 31, and the static switch 317 realizes the quick switching between the output of the inverter 315 and the output of the bypass isolation transformer 312; when the box-type transformer is in grid-connected operation, an alternating current 380V input power supply is connected, the box-type transformer uninterruptible power supply 31 supplies the voltage-stabilized, rectified and inverted power to equipment such as a box-type transformer protection measurement and control device and a circuit breaker in the box-type transformer for use, the UPS is equivalent to an alternating current voltage stabilizer at the moment and simultaneously charges the storage battery 314, when the box-type transformer is disconnected from the grid, the alternating current 380V input power supply disappears, the UPS is switched to supply power to the storage battery 314 without time limit, the electric energy in the storage battery 314 is inverted into alternating current, so that the uninterrupted alternating current power supply is ensured, the normal operation of the equipment such as the box-type transformer protection measurement and control device and the circuit breaker is maintained, when a rectification inversion unit of the UPS fails, the static switch.
In addition, the capacity of the UPS is designed to be 2kVA, and the capacity of the storage battery 314 meets the requirement of continuously supplying power for 120 minutes after the box transformer substation stops running; the UPS can normally work under the environment temperature condition of minus 40 ℃ to plus 70 ℃ to adapt to the special environment of a wind power plant, the influence of environmental factors is fully considered by selecting the storage battery, and the storage battery and the UPS are protected by a reliable shell, so that the arrangement of the UPS and the storage battery in the box transformer substation is reliable and safe, and other equipment in the box transformer substation cannot be influenced.
The ups branch breaker bank 34 includes a branch one breaker 341, a branch two breaker 342, a branch three breaker 343, a branch four breaker 344, and a branch five breaker 345.
The first branch circuit breaker 341 is connected with the box-type substation protection measurement and control device 4, signals of measurement, control and the like of a 35KV disconnecting switch 11, a 35KV circuit breaker 12, a 35KV current transformer 13, a main transformer 14, a 1KV frame-type circuit breaker 15 and a 1KV current transformer 16 of the main part 1 of the box-type substation are connected to the box-type substation protection measurement and control device 4, the second branch circuit breaker 342 is connected with a control loop of the 35KV circuit breaker 12, the third branch circuit breaker 343 is connected with an energy storage loop of the 35KV circuit breaker 12, the fourth branch circuit breaker 344 is connected with the 1KV frame-type circuit breaker 15, and the fifth branch circuit breaker 345 is connected with a display 5 and an.
The power of all devices in traditional box transformer all comes from inside box and becomes auxiliary power supply system, becomes the main power source and is cut off the back when the box, and inside all devices all lose the electricity immediately, unsatisfied relay protection and the requirement of control, the utility model discloses compare traditional box transformer's difference and lie in, for guaranteeing box transformer protection measurement and control device and circuit breaker control circuit's normal operating, prevent that the box becomes to be in the control blind spot, and the box that every box becomes the special online formula of a set of electric power of configuration becomes uninterrupted power source, becomes the circuit breaker, protection measurement and control device and auxiliary assembly for the box and provides incessant alternating current power supply.
The utility model discloses a take box transformer of wind-powered electricity generation field of alternating current uninterrupted power source, it has installed the case additional and has become protection measurement and control device, guarantee the continuous power supply and the normal work of main equipment such as the inside various circuit breakers of box transformer, and simultaneously, the box becomes uninterrupted power source has been disposed in the box transformer, can be in a period after box transformer main power source is cut off, still be in can monitor state, thereby improve the security and the reliability of box transformer, and realize the remote monitoring that wind-powered electricity generation field operating personnel become to the case.
The above embodiments are not intended to limit the present invention, and the present invention is not limited to the above examples, and the technical personnel in the technical field are in the present invention, which can also belong to the protection scope of the present invention.

Claims (4)

1. The utility model provides a box transformer in wind-powered electricity generation field of uninterrupted power source is exchanged in area, becomes main part (1), case transformer auxiliary power supply system (2) including box casing and the inside case of box casing, its characterized in that: the box-type transformer substation uninterruptible power supply system (3) and the box-type transformer substation protection measurement and control device (4) are further arranged in the box-type transformer substation uninterruptible power supply system (3), the box-type transformer substation uninterruptible power supply device (31), the input power supply (32), the power supply change-over switch (33) and the uninterruptible power supply branch circuit breaker group (34) are arranged in the box-type transformer substation uninterruptible power supply system (3), the box-type transformer substation uninterruptible power supply device (31) is connected with the power supply change-over switch (33), the input power supply (32) is directly connected with the power supply change-over switch (33), and the power supply change-over switch (33) is connected; the measurement and control signals of the main body part (1) of the box transformer substation are accessed into the box transformer substation protection measurement and control device (4), and the auxiliary power supply system (2) of the box transformer substation is connected with the uninterruptible power supply system (3) of the box transformer substation.
2. The wind farm box transformer with the alternating current uninterruptible power supply as claimed in claim 1, characterized in that: the box transformer uninterruptible power supply device (31) comprises a main loop input end isolation transformer (311), a bypass isolation transformer (312), a rectifier (313), a storage battery (314), an inverter (315), a main loop output end isolation transformer (316) and a static switch (317), wherein an input power supply (32) is connected with the main loop input end isolation transformer (311), the rectifier (313), the inverter (315), the main loop output end isolation transformer (316) and the static switch (317) are sequentially connected, the output end of the static switch (317) is connected with the power supply changeover switch (33) firstly, the input end of the main loop input end isolation transformer (311) is connected with the static switch (317) through the bypass isolation transformer (312), and the positive electrode of the storage battery (314) is connected with the positive electrode input end of the inverter (315), the negative electrode of the battery (314) is connected to the negative electrode input terminal of the inverter (315).
3. The wind farm box transformer with the alternating current uninterruptible power supply as claimed in claim 2, characterized in that: the uninterrupted power supply branch circuit breaker group (34) comprises a branch one circuit breaker (341), a branch two circuit breaker (342), a branch three circuit breaker (343), a branch four circuit breaker (344) and a branch five circuit breaker (345).
4. A wind farm box transformer with ac uninterruptible power supply according to claim 3, characterized in that: the first branch circuit breaker (341) is connected with the box transformer substation protection and measurement control device (4), measurement and control signals of a 35KV isolating switch (11), a 35KV circuit breaker (12), a 35KV current transformer (13), a main transformer (14), a 1KV frame type circuit breaker (15) and a 1KV current transformer (16) of a box transformer substation main body part (1) are connected into the box transformer substation protection and measurement control device (4), a second branch circuit breaker (342) is connected with a control loop of the 35KV circuit breaker (12), a third branch circuit breaker (343) is connected with an energy storage loop of the 35KV circuit breaker (12), a fourth branch circuit breaker (344) is connected with the 1KV frame type circuit breaker (15), and a fifth branch circuit breaker (345) is connected with a live display (5) and an electromagnetic lock (6) in a box type shell.
CN202021921469.6U 2020-09-04 2020-09-04 Wind power plant box type transformer with alternating current uninterrupted power supply Active CN212676028U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202021921469.6U CN212676028U (en) 2020-09-04 2020-09-04 Wind power plant box type transformer with alternating current uninterrupted power supply

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202021921469.6U CN212676028U (en) 2020-09-04 2020-09-04 Wind power plant box type transformer with alternating current uninterrupted power supply

Publications (1)

Publication Number Publication Date
CN212676028U true CN212676028U (en) 2021-03-09

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ID=74823934

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202021921469.6U Active CN212676028U (en) 2020-09-04 2020-09-04 Wind power plant box type transformer with alternating current uninterrupted power supply

Country Status (1)

Country Link
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