CN113224669A - Micro-positive pressure control device for box type equipment of transformer substation - Google Patents
Micro-positive pressure control device for box type equipment of transformer substation Download PDFInfo
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- CN113224669A CN113224669A CN202110486589.0A CN202110486589A CN113224669A CN 113224669 A CN113224669 A CN 113224669A CN 202110486589 A CN202110486589 A CN 202110486589A CN 113224669 A CN113224669 A CN 113224669A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/26—Casings; Parts thereof or accessories therefor
- H02B1/46—Boxes; Parts thereof or accessories therefor
- H02B1/48—Mounting of devices therein
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/26—Casings; Parts thereof or accessories therefor
- H02B1/28—Casings; Parts thereof or accessories therefor dustproof, splashproof, drip-proof, waterproof or flameproof
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/56—Cooling; Ventilation
- H02B1/565—Cooling; Ventilation for cabinets
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B7/00—Enclosed substations, e.g. compact substations
- H02B7/06—Distribution substations, e.g. for urban network
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Cooling Or The Like Of Electrical Apparatus (AREA)
Abstract
The invention discloses a micro-positive pressure control device for box type equipment of a transformer substation, which comprises: control assembly and sensor, the control assembly includes: the water storage box comprises a control box, a first air channel, a second air channel, a drain pipe, a control circuit board, a heating plate, a condensing plate, a semiconductor refrigerating sheet, a water storage box, a first fan, a second fan, a third fan and a fourth fan, wherein the lower ends of the condensing plate and the semiconductor refrigerating sheet are opposite to a water inlet of the water storage box; the first fan is arranged at an air inlet of the first air channel, and the air inlet surface of the first fan is abutted against one end of the heating plate; the second fan is arranged at the air outlet of the second air channel, and the air outlet surface of the second fan is abutted against the other end of the heating plate; the air outlet surface of the third fan is opposite to the upper end of the control circuit board, and the air inlet surface of the fourth fan is opposite to the condensation plate, so that quick dehumidification is realized by forming a micro-positive pressure environment.
Description
Technical Field
The invention relates to the technical field of transformer substation safety, in particular to a micro-positive pressure control device for transformer substation box type equipment.
Background
In power systems and industrial stations, electrical box type equipment is the most common, secondary wiring in a control cabinet is more, and the distance between each two pieces of equipment is shorter, so that if the control cabinet runs in an environment with higher humidity for a long time, internal precise elements and equipment are easily corroded, so that the equipment is easily mildewed, metal parts are corroded, and the ageing and damage of the equipment are accelerated; secondly, the insulation between electrified bodies of the electrical equipment is damaged, short circuit and breakdown phenomena are easily caused, equipment is damaged, even casualties and power grid abnormal events occur, and therefore the requirement on the operation working condition of the internal environment of the box type equipment is high.
The reasons for the high humidity inside the box-type equipment are as follows: firstly, the atmospheric environment has high humidity and the environmental temperature difference changes violently. The joint of the bottom of the box body and the cable channel can quickly invade water vapor, and even large-area box wall water accumulation (condensation) can be formed; and the cabinet body is arranged in a basement, and the indoor environment has high humidity. The temperature in the cabinet body is lower than the ambient temperature, so that the water vapor is favorably gathered; and thirdly, the cabinet body is sealed and aged, and after precipitation is finished, water vapor is naturally transpired and rises along with hot air, and rapidly enters the box body through an air gap to be gathered.
In order to ensure the safe and stable operation of the power grid system, the electrical equipment has long service life and is safe and reliable in the whole period. The power system puts high requirements on constant temperature, moisture resistance and condensation resistance in the cabinet. During the operation of the conventional box-type equipment, it is difficult to maintain the internal environment closed and constant temperature. Auxiliary systems need to be loaded to ensure the homeostasis during operation. The use of the existing damp-dispelling heating device generally adopts an off-line mode, and mostly adopts a heating plate and a heating fan as an environmental interference means, and state quantity management and control are taken as the design initials. Start when humidity, temperature reach the threshold value, not only prolong interior environment recovery time, because damp and hot air can't effectively be dredged simultaneously, the management and control effect is unsatisfactory.
Disclosure of Invention
The embodiment of the invention provides a micro-positive pressure control device for transformer substation box type equipment, which aims to solve the problem that the effect of controlling the environment inside the transformer substation box type equipment in the prior art is not ideal.
The embodiment of the invention discloses the following technical scheme:
a micro positive pressure control device for a substation box equipment, comprising: the transformer substation box type equipment comprises a control assembly and a sensor, wherein the sensor is arranged on the inner wall of the top of the shell of the transformer substation box type equipment; the control assembly includes: the control circuit board is arranged in the control box and is electrically connected with the sensor, the heating plate, the semiconductor refrigeration piece, the first fan, the second fan, the third fan and the fourth fan respectively; the control box is installed in the box type equipment of the transformer substation, the heating plate, the semiconductor refrigeration piece and the condensation plate are sequentially stacked and are all positioned below the control circuit board, the lower ends of the condensation plate and the semiconductor refrigeration piece are opposite to a water inlet of the water accumulation box, a water outlet of the water accumulation box penetrates through the bottom wall of the control box and is communicated with a water inlet at one end of the drain pipe, and the other end of the drain pipe extends out of the shell of the box type equipment of the transformer substation; the air inlet of the first air channel and the air outlet of the second air channel are respectively communicated with first openings of two opposite side walls of the control box, the air outlet of the first air channel and the air inlet of the second air channel are respectively communicated with second openings of two opposite side walls of the substation box type equipment, the first fan is installed at the air inlet of the first air channel, the air outlet surface of the first fan is opposite to the air inlet of the first air channel, and the air inlet surface of the first fan is abutted against one end of the heating plate; the second fan is arranged at the air outlet of the second air channel, the air inlet surface of the second fan is over against the air outlet of the second air channel, and the air outlet surface of the second fan is abutted against the other end of the heating plate; the third fan is located above the control circuit board, the air outlet surface of the third fan is opposite to the upper end of the control circuit board, and the air inlet surface of the fourth fan is opposite to the condensation plate.
Further: and a plurality of vent holes are formed in one side wall of the first air channel and one side wall of the second air channel.
Further: and ventilation filter cotton is arranged on the inner surface of the side wall where the ventilation holes of the first air duct and the second air duct are located.
Further, the micro-positive pressure control device for the substation box type equipment further comprises: and one end of the antenna is electrically connected with the communication chip on the control circuit board, and the other end of the antenna extends out of the control box.
Further, the communication chip is selected from at least one of the following: RS485 chip, NB-ITO chip, LOAR chip, 4G chip and 5G chip.
Further: and the air outlet of the first air duct and the air inlet of the second air duct are respectively covered with a check valve.
Further: and the second opening of one side wall of the substation box type equipment, communicated with the air outlet of the first air channel, is higher than the second opening of the other side wall of the substation box type equipment, communicated with the air inlet of the second air channel.
Further: the hot plate with between the semiconductor refrigeration piece, and, the semiconductor refrigeration piece with all bond through silica gel between the condensing plate.
Further: the sensor comprises a capacitance type temperature and humidity sensor and a physical type water drop comprehensive perception sensor.
The micro-positive pressure control device for the box type equipment of the transformer substation can solve the problem that the box type equipment of the transformer substation is difficult to form an absolute sealing environment due to aging of sealing facilities of old equipment and non-uniform industrial processing grades, so that the micro-positive pressure environment is formed in the box type equipment of the transformer substation, the invasion of humid air in the atmospheric environment to the box type equipment of the transformer substation can be effectively blocked, the effects of quickly dehumidifying and dehumidifying are achieved, potential safety hazards such as equipment aging, low insulating strength, secondary terminal breakdown, material mildew and corrosion of metal structural parts in a cabinet are effectively prevented, and the safe operation of a power grid is ensured; local air circulation is formed, effective and reasonable air flow distribution is formed, the temperature and the humidity are uniformly distributed, and dead angles of temperature and humidity monitoring are completely avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic structural diagram of a micro-positive pressure control device for substation box equipment according to an embodiment of the invention;
fig. 2 is a partial structural schematic diagram of a micro positive pressure control device for substation box equipment according to an embodiment of the invention;
fig. 3 is a bottom view of a heating plate, a condensing plate and a semiconductor cooling plate of the micro-positive pressure control device for the substation box equipment according to the embodiment of the invention.
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 some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention discloses a micro-positive pressure control device for box type equipment of a transformer substation. The micro positive pressure means that the air pressure in the substation box type equipment is slightly larger than the air pressure outside the substation box type equipment. As shown in fig. 1 to 3, the micro positive pressure control device includes: a control assembly and a sensor. The sensors are arranged on the inner wall of the top of the housing of the substation box arrangement 1 (not shown in the figure). Specifically, the sensor comprises a capacitance type temperature and humidity sensor and a physical type water drop comprehensive sensing sensor. The capacitive temperature and humidity sensor can detect the temperature and humidity of the environment in the substation box type equipment. For example, the capacitance type temperature and humidity sensor is DRWS-01. The physical water drop comprehensive perception sensor can monitor condensation in the box type equipment of the transformer substation. For example, the physical type water drop comprehensive perception sensor is the WLSD-01 type.
The control assembly includes: the device comprises a control box 2, a first air channel 3, a second air channel 4, a drain pipe 5, a control circuit board 6, a heating plate 7, a condensing plate 8, a semiconductor refrigerating sheet 9, a water accumulation box 10, a first fan 11, a second fan 12, a third fan 13 and a fourth fan 14, wherein the control circuit board, the heating plate 7, the condensing plate 8, the semiconductor refrigerating sheet 9, the water accumulation box 10, the first fan 11, the second fan 12, the third fan 13 and the fourth fan 14 are installed in the control box 2. The above-mentioned components can be mounted in the control box 2 by any suitable means known in the art, such as bolt and nut fastening, adhesive bonding, etc. The control circuit board 6 is electrically connected with the sensor, the heating plate 7, the semiconductor chilling plate 9, the first fan 11, the second fan 12, the third fan 13 and the fourth fan 14, respectively.
The control box 2 is mounted in the substation box 1 in any suitable manner, for example, by means of a bolt-and-nut fastening connection. Specifically, the control circuit board 6 has an MCU chip thereon. The heating plate 7, the semiconductor refrigerating sheet 9, the first fan 11, the second fan 12, the third fan 13, the fourth fan 14 and the like are controlled to work through the MCU chip. For example, when the ambient humidity is greater than the set humidity or the ring specific humidity approaches the historical humidity peak value, the MCU chip may control the corresponding components to start dehumidifying.
The heating plate 7, the semiconductor refrigeration piece 9 and the condensation plate 8 are sequentially stacked and arranged and are all located below the control circuit board 6. It is preferred. The heating plate 7 and the condensing plate 8 can be both in an organ shape, and are bonded between the heating plate 7 and the semiconductor refrigeration sheet 9, and between the semiconductor refrigeration sheet 9 and the condensing plate 8 through silica gel. The lower ends of the condensing plate 8 and the semiconductor refrigerating sheet 9 are opposite to the water inlet of the water collecting box 10. The water outlet of the water accumulating box 10 penetrates through the bottom wall of the control box 2 to be communicated with the water inlet at one end of the drain pipe 5, and the other end of the drain pipe 5 extends out of the shell of the substation box type equipment 1.
The first fan 11 is installed at the air inlet of the first air duct 3, and the air outlet surface of the first fan 11 faces the air inlet of the first air duct 3. The air intake surface of the first fan 11 abuts against one end of the heating plate 7. The second fan 12 is installed at the air outlet of the second air duct 4, and the air inlet surface of the second fan 12 faces the air outlet of the second air duct 4. The air outlet surface of the second fan 12 abuts against the other end of the heating plate 7. The air inlet of the first air duct 3 and the air outlet of the second air duct 4 are respectively communicated with first openings of two opposite side walls of the control box 2, and the air outlet of the first air duct 3 and the air inlet of the second air duct 4 are respectively communicated with second openings of two opposite side walls of the substation box type equipment 1. The two first openings may be located at the same height. The second opening of one side wall of the substation box type equipment 1 communicated with the air outlet of the first air duct 3 is higher than the second opening of the other side wall of the substation box type equipment 1 communicated with the air inlet of the second air duct 4, so that two air ducts with high and low distribution are formed, and hot air is conveniently discharged upwards. The second opening may be of a labyrinth design, for example an opening formed by a ventilation channel having a plurality of bends, in order to filter out dust and impurities in the air to a certain extent. The above structure makes the second fan 12 blow air in the direction of the first fan 11, and the first fan 11 discharges air to form an air flow channel.
The third fan 13 is located above the control circuit board 6, and an air outlet surface of the third fan 13 faces the upper end of the control circuit board 6. The air inlet surface of the fourth fan 14 faces the condensation plate 8. The above structure makes the third fan 13 blow breeze (i.e. the wind volume is not large) to the fourth fan 14, and the fourth fan 14 discharges wind to form another air flow channel.
In addition, a plurality of vent holes 15 are arranged on one side wall of the first air duct 3 and the second air duct 4, so as to further assist in forming a micro-positive pressure environment. Preferably, the inner surface of the side wall where the vent holes 15 of the first air duct 3 and the second air duct 4 are located is provided with ventilation filter cotton. The moisture in the air can tentatively be condensed to the ventilation filter pulp, and the supplementary interior ambient humidity that reduces box equipment 1 of transformer substation, the inside operating condition of guarantee box equipment 1 of transformer substation is clean simultaneously.
Specifically, the air outlet of the first air duct 3 and the air inlet of the second air duct 4 are respectively covered with a check valve 16. The starting pressure of the check valve 16 can be obtained according to the flow of the vent 15 and the power of the first fan 11 and the second fan 12, so that the explosive damage to the substation box type equipment 1 caused by overlarge pressure is avoided while the micro-positive pressure of the internal environment is ensured, and meanwhile, the reverse invasion of water vapor in the air to the substation box type equipment 1 is avoided.
Preferably, the micro-positive pressure control device further includes: an antenna 17. One end of the antenna 17 is electrically connected with the communication chip on the control circuit board 6. The other end of the antenna 17 extends out of the control box 2. Specifically, the communication chip is selected from at least one of the following: RS485 chip, NB-ITO chip, LOAR chip, 4G chip and 5G chip, thereby the high-speed transmission of accessible multiple communication mode realization signal, transmission distance can reach 5000m of visualing, the signal can penetrate buildings such as steel-concrete building, steel construction, and the immunity to disturbance is strong, can realize the interconnection intercommunication between electric power production station equipment, still can connect remote control terminal, cell-phone or panel computer, can monitor relevant equipment anytime and anywhere through APP, realize the automatic interior outer net function of each other of all abnormal signal.
The device is used as follows:
when the sensor detects the rise of moisture or the fluctuation of air temperature, the control circuit board 6 activates the first fan 11, the second fan 12, the third fan 13, the fourth fan 14, the heating plate 7 and the semiconductor condensation sheet 9. Under the action of the third fan 13 and the fourth fan 14, moist air flows to the position near the semiconductor condensation sheet 9, the semiconductor condensation sheet 9 refrigerates to enable the moist air to be cooled into water, the condensation plate 8 adsorbs water vapor to form dew drops, the dew drops enter the water accumulation box 10 and are discharged through the drain pipe 5, so that the moisture in the air in the substation box type equipment 1 is reduced, the relative humidity and the absolute humidity are reduced at the same time, and the condensation phenomenon caused by reaching a condensation point is prevented; meanwhile, the heating plate 7 is used for heating to dry damp air, the dried air is discharged from an air outlet of the first air channel 3 through an air channel formed by the third fan 13 and the fourth fan 14 to discharge hot air, so that directional flow of the air in the substation box type equipment 1 is formed, gas circulation and flow in the substation box type equipment 1 are accelerated, local water vapor accumulation in a certain area is reduced, and the possibility of condensation formation is reduced; form the hot air area in transformer substation box equipment 1 to form the environmental condition of pressure-fired in transformer substation box equipment 1 fast, isolated outside steam prevents that outside steam from getting into the cabinet body. Due to the design of the vent holes 15 in the first air duct 3 and the second air duct 4, the substation box type equipment 1 is further enabled to form a micro-positive pressure environment state, external water vapor is isolated, and the external water vapor is prevented from entering the substation box type equipment 1.
Further, the control circuit board 6 may activate only the heating plate 7, the first fan 11, and the second fan 12 when the sensor detects a temperature change. The heating plate 7 is used for heating, hot air is discharged through a gas flow channel formed by the first fan 11 and the second fan 12, a local circulation flow is formed in the substation box type equipment 1, gas circulation and flow in the substation box type equipment 1 are accelerated, local water vapor accumulation in a certain area is reduced, the probability of condensation formation is reduced, and the absolute positive pressure of the environment in the substation box type equipment 1 relative to the atmospheric environment is guaranteed.
To sum up, the micro-positive pressure control device for the substation box type equipment of the embodiment of the invention can solve the problem that the substation box type equipment is difficult to form an absolute sealing environment due to aging of old equipment sealing facilities and non-uniform industrial processing grades, and the micro-positive pressure environment in the substation box type equipment can effectively block the invasion of humid air in the atmospheric environment to the substation box type equipment, thereby achieving the effects of quickly dehumidifying and dehumidifying, effectively preventing potential safety hazards such as equipment aging, low insulating strength, secondary terminal breakdown, material mildew and corrosion of metal structural parts in a cabinet, and ensuring the safe operation of a power grid; local air circulation is formed, effective and reasonable air flow distribution is formed, the temperature and the humidity are uniformly distributed, and dead angles of temperature and humidity monitoring are completely avoided.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A pressure-fired control device for a substation box equipment, comprising: the transformer substation box type equipment comprises a control assembly and a sensor, wherein the sensor is arranged on the inner wall of the top of the shell of the transformer substation box type equipment;
the control assembly includes: the control circuit board is arranged in the control box and is electrically connected with the sensor, the heating plate, the semiconductor refrigeration piece, the first fan, the second fan, the third fan and the fourth fan respectively;
the control box is installed in the box type equipment of the transformer substation, the heating plate, the semiconductor refrigeration piece and the condensation plate are sequentially stacked and are all positioned below the control circuit board, the lower ends of the condensation plate and the semiconductor refrigeration piece are opposite to a water inlet of the water accumulation box, a water outlet of the water accumulation box penetrates through the bottom wall of the control box and is communicated with a water inlet at one end of the drain pipe, and the other end of the drain pipe extends out of the shell of the box type equipment of the transformer substation;
the air inlet of the first air channel and the air outlet of the second air channel are respectively communicated with first openings of two opposite side walls of the control box, the air outlet of the first air channel and the air inlet of the second air channel are respectively communicated with second openings of two opposite side walls of the substation box type equipment, the first fan is installed at the air inlet of the first air channel, the air outlet surface of the first fan is opposite to the air inlet of the first air channel, and the air inlet surface of the first fan is abutted against one end of the heating plate; the second fan is arranged at the air outlet of the second air channel, the air inlet surface of the second fan is over against the air outlet of the second air channel, and the air outlet surface of the second fan is abutted against the other end of the heating plate;
the third fan is located above the control circuit board, the air outlet surface of the third fan is opposite to the upper end of the control circuit board, and the air inlet surface of the fourth fan is opposite to the condensation plate.
2. The micro-positive pressure control device for a substation box equipment according to claim 1, characterized in that: and a plurality of vent holes are formed in one side wall of the first air channel and one side wall of the second air channel.
3. The micro-positive pressure control device for a substation box equipment according to claim 2, characterized in that: and ventilation filter cotton is arranged on the inner surface of the side wall where the ventilation holes of the first air duct and the second air duct are located.
4. The micro-positive pressure control device for a substation box equipment according to claim 1, further comprising: and one end of the antenna is electrically connected with the communication chip on the control circuit board, and the other end of the antenna extends out of the control box.
5. The micro-positive pressure control device for substation box equipment according to claim 4, characterized in that the communication chip is selected from at least one of the following: RS485 chip, NB-ITO chip, LOAR chip, 4G chip and 5G chip.
6. The micro-positive pressure control device for a substation box equipment according to claim 1, characterized in that: and the air outlet of the first air duct and the air inlet of the second air duct are respectively covered with a check valve.
7. The micro-positive pressure control device for a substation box equipment according to claim 1, characterized in that: and the second opening of one side wall of the substation box type equipment, communicated with the air outlet of the first air channel, is higher than the second opening of the other side wall of the substation box type equipment, communicated with the air inlet of the second air channel.
8. The micro-positive pressure control device for a substation box equipment according to claim 1, characterized in that: the hot plate with between the semiconductor refrigeration piece, and, the semiconductor refrigeration piece with all bond through silica gel between the condensing plate.
9. The micro-positive pressure control device for a substation box equipment according to claim 1, characterized in that the sensor comprises: capacitive temperature and humidity sensor and physical water drop comprehensive perception sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110486589.0A CN113224669A (en) | 2021-04-30 | 2021-04-30 | Micro-positive pressure control device for box type equipment of transformer substation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110486589.0A CN113224669A (en) | 2021-04-30 | 2021-04-30 | Micro-positive pressure control device for box type equipment of transformer substation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113224669A true CN113224669A (en) | 2021-08-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110486589.0A Pending CN113224669A (en) | 2021-04-30 | 2021-04-30 | Micro-positive pressure control device for box type equipment of transformer substation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113224669A (en) |
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2021
- 2021-04-30 CN CN202110486589.0A patent/CN113224669A/en active Pending
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Address after: 750001 west of Tongda South Street and north of Jinfeng Road, Jinfeng Industrial Park, Yinchuan Economic Development Zone, Yinchuan City, Ningxia Hui Autonomous Region Applicant after: Super high voltage company of State Grid Ningxia Electric Power Co.,Ltd. Applicant after: Ningxia Ultra High Voltage Power Engineering Co., Ltd Address before: 750001 west of Tongda South Street and north of Jinfeng Road, Jinfeng Industrial Park, Yinchuan Economic Development Zone, Yinchuan City, Ningxia Hui Autonomous Region Applicant before: STATE GRID NINGXIA ELECTRIC POWER CO., LTD. MAINTENANCE Co. Applicant before: Ningxia Ultra High Voltage Power Engineering Co., Ltd |