Product

SF6 Gas Insulated RMU

        The SF6 gas-filled fully insulated ring network cabinet is a new generation of SF6 gas fully insulated, fully enclosed, shared box and expandable maintenance-free power distribution switch equipment independently developed by Sanhe Power Tech(Shenzhen)Co., Ltd. The load breaker switch body in the ring mains cabinet adopts the latest generation load switch and vacuum circuit breaker with independent research and development. The side-mounted high-performance vacuum circuit breaker is used. The switch can be equipped with a self-developed spring operating mechanism. The vacuum circuit breaker can also be equipped with The vacuum circuit breaker can also be equipped with permanent magnet operation.


Introduction

  • The SF6 gas-filled fully insulated ring network cabinet is a new generation of SF6 gas fully insulated, fully enclosed, shared box and expandable maintenance-free power distribution switch equipment independently developed by Sanhe Power Tech(Shenzhen)Co., Ltd. The load breaker switch body in the ring mains cabinet adopts the latest generation load switch and vacuum circuit breaker with independent research and development. The side-mounted high-performance vacuum circuit breaker is used. The switch can be equipped with a self-developed spring operating mechanism. The vacuum circuit breaker can also be equipped with The vacuum circuit breaker can also be equipped with permanent magnet operation.

Main Parameters

C module

Load switch

F module

Combination electrical

CB module breaker

Rated voltage  kV

12

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

95

Rated current A

630

125 note*

630/1250(note**)

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 transfer breaking current

1800

Rated short-circuit breaking current

31.5(note***)

25

Rated short-circuit making current

50

80(note***)

63

Rated short-time withstand current (4s)

20

25

Rated peak withstand current

50

63

Mechanical life

10000

10000

20000

Ambient temperature (Celsius)

-40---+40

SF6 gas pressure (gauge pressure at 20 ) MPa

0.03

Arc withstand capability kA/1s

20

Protection level

Tank IP67/cabinet IP4X


  • Remark:
  • * Limited by the fuse, depending on the rating of the fuse.
  • ** The maximum rated current value of the circuit breaker unit and bus bar can be up to 1250A, which can be negotiated with the manufacturer according to customer needs.
  • *** is the expected value and depends on the high-voltage fuse.

Feature

  • It adopts the latest generation of load switch arc extinguishing technology with independent intellectual property rights of rotary compressed permanent magnet rotary arc assisted blowing. It has the characteristics of strong arc extinguishing ability, high operating reliability and long electrical life. Therefore, the breaking transfer current can be as high as 1800A.
  • rmu.jpg

  • 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.
  • The main circuit design in the air box of the product introduces the 110kV high voltage GIS design concept and uses computer modern electric field analysis software, and the main circuit design is highly optimized to achieve the compact design of the product while ensuring that the product has excellent electrical insulation performance. It is necessary to add some balanced electrode products to the load switch contact system to fully meet the technical requirements of the 24kV ring network cabinet.
  • Through the three-dimensional modeling of the main circuit of the product and the detailed electric field simulation analysis, the product has no detectable partial discharge at 1.1 times the rated line voltage (ie 13.2kV), which fully meets the requirements of no partial discharge switchgear.
  • Through the three-dimensional modeling of the product's main circuit and detailed simulation analysis of the main circuit's current carrying capacity and heat dissipation channels, the product fully meets the temperature rise requirement of 1.1 times the rated current.
  • Through the structural modeling of the air tank body of the product and the detailed stress simulation analysis of the air tank under the rated inflation pressure, the deformation of the air tank after inflation has been well controlled to ensure that the switch body in the air tank working well with operating mechanism outside the air tank. It is perfectly ensure the reliability of product operation and operation.
  • rmu2.jpg

  • The vacuum circuit breaker adopts a side-mounted high-performance vacuum circuit breaker. The width of the circuit breaker cabinet is only 420mm, the rated breaking current can reach 25kA, and the circuit breaker operating mechanism has an automatic reclosing function.
  • rmu3.jpg

  • The mechanical life of the circuit breaker can reach 20,000 times, the action is reliable and stable, and the braking is fast. The three-station mechanism with four-link output is adopted to avoid overshoot of the isolation knife and excessive shaking of the moving contact.
  • The circuit breaker mechanism and the three-station mechanism use the same motor, which is convenient for production management and maintenance at the operation site. There is a certain interlocking device between the mechanisms to ensure reliable operation of the operating mechanism and effectively avoid misoperation.
  • The product has a complete five-prevention interlocking function, which fully meets the operation and operational safety performance requirements of the State Grid Corporation.
  • The product has complete technical solutions, and can realize upper isolation or lower isolation, top expansion or side expansion, co-box type or expandable type, spring operating mechanism or permanent magnet operating mechanism according to the technical requirements of various places and even countries.
  • The main circuit adopts optimized electrode design, and the high-potential conductors in the air box are completely bare conductors between phases and fractures. There is no need to block the discharge insulating partition, and there is no hidden danger of insulation aging failure.

Advantage

  • The gas box weld design can meet laser welding according to customer needs. It has a small heat-affected zone, narrow welds, fast weld cooling, small changes in weld metal properties, hard welds, and neat appearance. Using fully automated robotic laser welding equipment, product qualification rate and production efficiency will be greatly improved.
  • The gas box weld design can meet the needs of customers for cold metal transition welding (CMT). Cold metal transition welding has a lower investment than laser welding, high welding efficiency, no splashes in the weld, and strong wire-filled fusion welding. The characteristics of small thermal deformation of the workpiece, so the air tightness and reliability of the product are effectively guaranteed.
  • Helium mass spectrometry and buckle cover double leak detection, each gas box is quantitatively leaked by helium mass spectrometry before inflating, and the film plastic bag buckle cover is used for qualitative leak detection after the gas box is inflated for 24 hours.
  • The switch body, operating mechanism, and ring main unit production assembly line all use pneumatic torque wrenches, which effectively reduces the labor intensity of the assembly line staff, and ensures that the assembly of each screw in the switch cabinet assembly can meet the design requirements, thereby ensuring Improve the assembly quality of the product.
  • Each welding stud on the ring main unit box body is welded by a German KOCO professional stud welding machine to ensure that the studs are free of false welding, ensuring the accuracy and reliability of the installation of load switches, vacuum circuit breakers and their operating mechanisms .

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