HV Switchgear
  Air Insulated Switchgear
(Up to rated voltage 15 kV)
 
  Single Busbar
(Horizontal drawout) / Horizontal isolation AH12
 
  Double Busbar
(Horizontal drawout) / Horizontal isolation AH12
  Gas Insulated Switchgear (Up to rated voltage 36 kV)
 
  36 kV Gas insulated Switchgear
  15 kV Ring Main Unit
 
  15 kV Ring Main Unit with Switch fuse unit / VCB
LV Switchgear
 
Transformers
Unit Distribution Substations
Substation Automations
Busduct
 
Projects & Services
 
 

RING MAIN UNIT (RMU)

Type AR12 with ring switches and Switch-Fuse/circuit breaker in SF6 insulated chamber.

 
 

Salient Features :

  • Free standing or Transformer mounted.
  • Indoor and outdoor use.
  • Built-in Earthing Switches for ring cables and Transformer.
  • Built-in cable testing facility.
  • High degree of operator safety.
  • Full Protection from external environment.
  • Single operating handle for all Switches.
  • Reduced maintenance.

TECHNICAL DATA
Ratings Unit

Ring Switch (Load Break Switch) Type: ARRS-12

Transformer Switch-Fuse (Load Break Switch) Type: ARTS 12

Vacuum Circuit Breaker

Type: AH12

Rated Voltage kV 12/15 12/15 12/15
Rated Current (IEC Rating) A 630 200 630
P.F. Withstand Voltage kV 28/38 28/38 28/38
Impulse Withstand Voltage kVp 75/95 75/95 75/95
Frequency Hz 50/60 50/60 50/60
Breaking Current kA - 20/25 ** 20/25
Mainly Active Load A 630 200 -
Closed Loop Current as per IEC 62271 - 103 A 630 - -
Cable Charging Current as per IEC 62271 - 103 A 25 25 -
Short-time Withstand Current for 3 sec kA 20 2.5 21
Short-time Withstand Current for 1 sec kA 25 3.15 25
Rated Peak Withstand Current kAp 62.5 8.2 62.5
Rated Peak Making Current kAp 62.5 50/65 ** 62.5
Fuse Rating A - Up to 160 -
Rated Busbar Current (IEC Rating) A Up to 1250
Minimum operating SF6 Gas Pressure Bar g 0.05

** Prospective value, the actual current being limited by fuse