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Dry Air Insulated Ring Main Unit

  •  Dry Air Insulated Ring Main Unit
  •  Dry Air Insulated Ring Main Unit
Product overview:

The XGN118-11/24 dry air insulated ring main unit is a kind of ecofriendly and newly-developed ring main unit to replace the SF6 gas insulated ring main unit. The technology is based on domestic high voltage switchgear situations and advanced foreign technology.


This dry air insulated ring main unit is used as protection in power distribution equipment, distribution of electricity and protection and control of the transformer. It is suitable for city networks, distribution network transformation and residential areas.

Type and significance of the product:
Technical parameters:
Parameters Load-break switch (Cabinet C) Circuit breaker (Cabinet V) Disconnecting switch, grounding switch
Rated voltage (kV) 11/24 11/24 11/24
Rated current (A) 630 630 630
Rated frequency (Hz) 50 50 50
extinguishing arc mode vacuum vacuum
power- frequency withstand voltage (kV) line-to-line 42 42 42
line-to- ground 48 48 48
lightning impulse (kV) line-to-line 75 75 75
line-to- ground 85 85 85
Rated short-circuit breaking current (kA) 20
Rated short-circuit breaking current breaking times 30
Rated short-circuit current (kA) 50 50 50
Rated short-time withstand current(kA) 20 20 20
Rated short-circuit duration (S) 4 4 4
Rated peak withstand current (kA) 50 50 50
Rated cable charging breaking current (A) 10
Take over current (A)
Arc duration (S) 0.5 0.5 0.5
partial discharge (Pc) ≤5 ≤5
IP IP67 IP67 IP67
Mechanical service life 10000 10000 3000
Size 400*825*1600 400*825*1600

-Insulation medium of this dry air insulated ring main unit uses dry air, no SF6 gas is used, making it eco-friendly.
-Three-position disconnecting switch, equipped with visible fracture, ensures safe operation.
-It is fully insulated, fully enclosed, and with design of micro positive pressure so that it can run safely under zero pressure.
-It has a small module, giving it a flexible design scheme.
-Vacuum interrupter replaces the grounding switch short circuit, so that it is safe and reliable.
-It can meet the disconnecting switch scheme.

Application environment:
Item Parameters
Ambient temperature
Max temperature (≤℃) 50
Min temperature (≤℃) -40
Max temperature difference  (k) 25
Ambient humidity
Daily relative temperature (≤℃) 95
Monthly relative temperature (≤℃) 90
Working conditions
Altitude (≤m) 1000
Solar radiation intensity 0.1
Pollution Grade IV
Icing-thickness (≤cm) 10
Wind speed (m/s) / wind pressure (pa) 34/700
Earthquake-resistant ability (g) 0.2
IP grade
SF6 gas cabinet IP67
Use holder IP67
Cabinet IP67
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