Product

Environment-friendly Nitrogen Insulated RMU

       The environmentally-friendly Nitrogen fully insulated ring network cabinet is the latest generation of truly environmentally friendly gas-filled fully insulated, fully enclosed, shared box and expandable maintenance-free power distribution switches independently developed by Shenzhen Sanhe Power Technology Co., Ltd. equipment.


introduction

  • The environmentally-friendly Nitrogen fully insulated ring mains cabinet is the latest generation of truly environmentally friendly gas-filled fully insulated, fully enclosed, shared box and expandable maintenance-free power distribution switches independently developed by Sanhe Power Tech (Shenzhen)Co., Ltd. equipment. The ring main circuit uses nitrogen (N2), which accounts for 78% of the natural air composition, as the insulating medium, and the vacuum load switch or vacuum circuit breaker is used as the breaking unit. The main circuit of the switchgear adopts an optimized electrode shape to balance the electric field distribution of the main circuit. There is no need to use solid insulating materials such as epoxy resin, which can ensure that the product does not require any non-environmental gas recovery after the end of its service life, and minimizes the extra-nuclear cost burden caused by solid chemical insulation waste disposal. Therefore, it can be said that Sanhe’s environmentally friendly nitrogen inflatable fully insulated ring main unit is currently the first newest and truly environmentally friendly inflatable cabinet in the domestic and even international markets. The environment-friendly nitrogen filled and fully insulated ring network cabinet vacuum load switch or vacuum circuit breaker adopts a self-developed high-performance spring operating mechanism, and can also be equipped with permanent magnet operating according to customer needs.

Feature

  • 1. The main circuit of the switchgear in the gas box adopts optimized electrode shape to balance the electric field distribution of the main circuit, eliminating the need to use solid insulating materials such as epoxy resin, which can ensure that the product does not require any non-environmental gas recovery after the end of the service life, and minimizes solid chemicals. The extra-nuclear cost burden caused by insulation waste disposal.
  • vacuum breaker 3 position unit.jpg

  • 2 The product is developed based on the interface size of the SF6 gas-filled and fully insulated ring main unit standardized by the State Grid Corporation of China and IEC.
  • 3 .Introduction of 110 kV high voltage G IS design for the main circuit design in the product air box Concept and with the help of computer modern electric field analysis software, and the main circuit design is highly optimized, while achieving the compact design of the product The product has excellent electrical insulation performance, and the air box of the product is fully opened. It can meet the rated insulation level when it is open.
  • 20201117110826.jpg

  • 4. Through the three-dimensional modeling of the main circuit of the product and detailed electric field simulation analysis, the product has no detectable partial discharge under the condition of 1.1 times of rated line voltage (i.e. 13.2kv), which fully meets the requirements of non PD switchgear.
  • 5. Through the three-dimensional modeling of the main circuit and detailed simulation analysis of the current carrying capacity and heat dissipation channel of the main circuit, the product fully meets the temperature rise requirement of 1.1 times of the rated current.
  • _20201117111010.png

  • 6 The main circuit design in the air tank of the product introduces the 110 kV high-voltage G IS design concept and uses computer modern electric field analysis software to highly optimize the main circuit design to achieve a compact design of the product while ensuring that the product has excellent electrical insulation performance. The product air box is fully open It can meet the rated insulation level when it is open.
  • 7 , The mechanical life of the circuit breaker can reach 20000 times, and the mechanical life of the three-position isolating switch 5 000 times, reliable and stable action, fast braking. Triplex with four-link output Position mechanism to avoid overshoot of the isolation knife and excessive shaking of the moving contact.
  • 8 , Vacuum circuit breaker or vacuum load switch and S F6 gas-filled fully insulated ring main unit circuit breaker The mechanism is universal, the circuit breaker operating mechanism and the three-station mechanism use the same motor, so It is convenient for production management and maintenance at the operation site. There is a certain interlock between institutions The device ensures reliable operation of the operating mechanism and effectively avoids misoperation.

    20201117111700.png

  • 9 , The product has a complete five-prevention chain function, which fully meets the operation of the State Grid Corporation And operational safety performance requirements.
  • 10 , The product technical plan is complete, which can be implemented according to the technical requirements of various places and even countries Current upper isolation or lower isolation, top expansion or side expansion, co-box type or expandable type, spring actuator Structure or permanent magnet operating mechanism.

  • _20201117111322.png


  • 11 , The main circuit adopts optimized electrode design, and the high-potential conductors in the gas box are completely bare conductors between phases and fractures. There is no need to block the discharge insulating partitions. The hidden danger of insulation aging failure.

  • 20201117112314.png

Feature

  • 1 , The design of the gas box weld seam can meet the needs of customers. Laser welding has a thermal impact The area is small, the welding seam is narrow, the welding seam cooling speed is fast, the weld metal properties change little, and the welding seam Harder, neat appearance. Using fully automated robot laser welding equipment, product integration Frame rate and production efficiency will be greatly improved.
  • 2 , Gas box welding seam design can meet customer needs. Cold metal transfer welding C MT Cold metal transition welding has lower investment than laser welding, high welding efficiency, and no fly inside the weld Splashing, wire-filled welding and welding seam have strong bridging function and small thermal deformation of the workpiece, so it is effective The air tightness and reliability of the product are guaranteed.
  • 3 , Double leak detection by helium mass spectrometer and buckle cover Each gas box is quantitatively checked by helium mass spectrometer before charging After the air box is inflated, the buckle cover of the film plastic bag shall be used for qualitative leak detection after standing for 24 hours.
  • 4. Production and installation of switch body, operating mechanism and ring main unit All wiring uses pneumatic torque wrenches, which effectively Reduce the labor intensity of the assembly line employees and ensure The assembly of each screw in the switchgear assembly is Can meet the design requirements, thereby ensuring the product’s Assembly quality.
  • 5 , Each welding stud on the ring main unit box is Welded by German KOCO professional stud welding machine, Ensure that the studs are free from false welding and ensure the load switch, vacuum circuit breaker and their operating mechanism The accuracy and reliability of the installation.
  • 20201117112731.png


  • Product quality control

    • Switch body, operating mechanism, The production of ring network cabinets has complete incoming inspection, process inspection, final inspection procedures and complete inspection methods. Ensure the high quality of the factory products.
    • 1 , Main purchase inspection and equipment:
    • 2 , Main process inspection and equipment
    • a, Load switch, vacuum circuit breaker and its operating mechanism characteristic detector Each load switch, vacuum circuit breaker and its operating mechanism of the series ring network cabinet Before entering the air box assembly, it must go through a strict German KOCOS circuit breaker. The characteristic detection of the analyzer ensures that each load switch and vacuum circuit breaker Closing speed, contact opening distance, three phases, contact overshoot, contact The rebound amplitude is in compliance with the standard and product design requirements.
    • b, Loop resistance measurement Each switch body, air box assembly, and ring main unit are tested for loop resistance before leaving the factory, so as to ensure that each ring main unit The reliability of the electrical contact of each circuit of the cabinet.
    • c, Helium mass spectrometer leak detection: The helium mass spectrometer leak detector produced by the United States Infucang company is used. Each gas box of the ring network cabinet passes through strict helium before entering the final assembly line. Mass spectrometry leak detection ensures that the leak rate of each gas box is lower than 1.6*10 8 Pa m3 per second, which is close to one third of the 0.1% annual leak rate specified in the standard.
    • 3 , Final inspection and equipment
    • a, Switchgear performance test Before leaving the factory, each switch body, air box, and ring main unit will undergo strict factory performance tests according to the engineering design drawings. Carry out all electric tests according to the auxiliary working voltage actually used by the customer on site to ensure its performance load project design requirements.
    • b. Chain tool function verification Chain tool function verification: Each ring main unit will be strictly verified before leaving the factory to ensure that the equipment uses its chain functions. Carry out strict verification to ensure the safety of equipment use. Security.
    • c, Power frequency withstand voltage test Power frequency withstand voltage test: switch body, air box, switch body, air box, ring main unit, each ring main unit will undergo strict power frequency withstand voltage test and verification before leaving the factory Before the product leaves the factory, a strict power frequency withstand voltage test will be carried out to verify that the electrical insulation level of the product's phase-to-phase, phase-to-ground, and fracture meets the requirements of the design and standards. Ensure that the insulation of the equipment in operation can be designed and the requirements of the standard, and ensure the insulation reliability of the equipment in operation. Reliability.

Main Parameters


Load switch cabinet

Breaker

Cabinet

Rated voltage  kV

12

95

Rated frequency Hz

50/60

1 min power frequency withstand voltage (phase to phase, to ground) kV

42

1 min power frequency withstand voltage (fracture) kV

48

Lightning impulse withstand voltage kV

75

Rated current A

630

630/1250(*)

Rated active load breaking current A

630


Rated closed loop breaking current A

630


Rated cable charging breaking current A

10

25

Ground fault breaking current A

31.5


Cable charging breaking current A during ground fault

17.3


Rated short-circuit breaking current


20

Rated short-circuit making current

50

Rated short-time withstand current (4s)

20

Rated peak withstand current

50

Mechanical life

20000

3-position isolator Mechanical life

10000

Ambient temperature (Celsius)                 

-40---+40

SF6 gas pressure (gauge pressure at 20  ) MPa

0.02

Arc withstand capability kA/1s

20

Protection level

Tank IP67/cabinet IP4X

Note*  The rated current value of circuit breaker unit and bus can be up to 1250A, which can be negotiated with the manufacturer according to the customer's demand.


Online

Message

Top