• 1 in 6 out solid insulated switchgear SIS MV switchgear ring main unit
  • The front side of solid insulated switchgear SIS Medium Voltage Switchgear ring main unit
  • the front side of solid insulated switchgear SIS MV switchgear ring main unit
  • Solid insulated switchgear SIS and Zinc sprayed vacuum circuit breaker

10KV/24KV Ring main unit

Dry air/ Nitrogen type switchgear

Degatech electric Ring main unit offer more flexibility without the need for preventative maintenance leading to a longer-lasting solution. Is an excellent alternative for applications where with SF6 gas insulation is not preferred，Degatech electric Solid Switchgear utilizes the same proven vacuum technology (all high voltage operations occur in a vacuum contact bottle) backed by over 20 years of industry leading quality and performance.

Solid insulated switchgear is also a kind of ring main unite which adopts solid insulating material as the main insulating medium. The vacuum interrupter and the conductive connection thereof, the disconnecting switch, the earthing switch, the main bus bar, the branch bus bar and other leading circuits are single or coated and packaged with the solid insulation insulation medium as a whole or a plurality of modules with certain functions, which can be combined or recombined with the modules with full insulation and full sealing performance.

The insulation structure in which the high voltage elements of the main circuit of the switchgear are all coated or fixed with solid medium. The power supply of the solid insulation ring net cabinet is connected by closed cable terminal, the contact bus between each unit is sealed or open expansion, the air insulation medium is used in the open expansion, the reasonable air gap is maintained between the phases, and the solid insulator maintains a reasonable insulation crawl distance. The sealed cable terminal access and contact bus sealed extended unit can meet the insulation requirements of altitude 4km plateau environment.

The rated value of solid insulated ring network cabinet is selected from the following items:

  1. Rated voltage(Ur)The standard value of the front set is 12kV.
  2. Rated insulation level
  3. Rated frequency (frs)50-60Hz
  4. Positive current (main circuit) (Ir)630/1250A
  5. Short Time Resistance Current (For Main Circuit and Ground Circuit) (If)20;  25kA
  6. Peak Resistance Current (Main and Ground Circuit) (Ip)50; 63kA
  7. Short circuit length (tk)4s
  8. Voltage (Ua) of the opening and close devices and the secondary circuit 48V.
  9. The power supply frequency of the opening and close devices and the secondary circuitDC; AC50-60Hz
  10. Transfer current (Itrasser)1250A
  11. Transfer current (Iso)1250A
  12. Amount of Local Discharges (Pc) 5Pc

The amount of part discharges of solid components shall not be greater than 5pC (measured at 1.1 Ur)

The PD of each functional unit should not be more than 20pC (measured at 1.1 Ur)

1 in 6 out solid insulated switchgear SIS MV switchgear

The front side of solid insulated switchgear SIS Medium Voltage Switchgear  

Rated voltage12KV√
Rated electricity flow630A or 1250A√
Rated frequency50HZ
Rated short-term power frequency withstand voltage dry test48KV Between phases,phase to earth 42KV, Acrossthe interrupter,across isolating distance:48KV√
Rated lightning impulse withstand voltage85KV Between phases,phase to earth 75KV, Acrossthe interrupter,across isolating distance:85KV√
Short-time withstand current25KA√
Duration of short-circuit4S√
Peak withstand current63KA√
Short-circuit making current63KA√
Short-circuit breaking current
AC component25KA√
DC component51%√
DC time constant45ms√
Mechanical enduranceCircuit-breaker:10000 times,Class M2; Disconnector:3000 times,Class M1;Earthing position:3000 times,Class M1√
The degree of protectionEnclosure:IP4X            Partitions:IP2XC√

the front side of solid insulated switchgear SIS MV switchgear