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Medium Voltage Power Distribution

Technical Details
Rated short circuit breaking current (kA)up to 31.5kA
Rated internal arc current (kA)25kA & 31.5kA
Power frequency withstand voltage (kV)28kV (for 1 minute) / 38kV (for 1 minute)
Lightning Impulse voltage (kV peak)75kV / 95kV
Degree of protection for enclosureIP4X (Indoor)
Maximum design ambient temperature (ºC)50ºC
Design ambient temperatureUp to 55ºC
Rated current ratings are at an ambient of 40ºC
  • Solution for primary and secondary distribution up to 24kV
  • Indoor type air insulated switchgear having sheet metal enclosure with compartmental design.
  • Main switching devices are draw-out type Vacuum or SF6 Circuit Breakers as per client requirement
  • Designed as per IEC 62271-200 and service continuity & partition category LSC2B/PM as per IEC.
  • Internal Arc design and protection classification – ALFR as per IEC
  • Compatibility with latest measuring & protection equipment including advance numerical relays.
  • Engineered as per specific application, requirement of market segments and clients.
  • Draw-out & Fixed (RMU) type alternatives
  • The switchgear is extensible type

  • Operation & maintenance interlocks provided for:

  • Circuit breaker door with test / service position of switching device
  • Earth switch operation with test / service position of switching device
  • Secondary plug with test / service position of switching device
  • Emergency trip facility
  • Special interlocks as per application & client requirement

Enclosures:

Switchgear enclosures are self supporting type and are made of 2mm sheet steel. Load bearing members are of 2.5/3mm sheets. Fabrication of sheet components is done using CNC & NC machines.

Fabricated components are powder coated or zinc plated for surface protection. The freestanding functional units are extensible type.

Components:

Power components like circuit breakers, current transformers, busbars are installed in separate compartment providing service continuity class LSC2B as per IEC 62271-200. Metallic partitions are provided to segregate these compartments. Busbar, Circuit breaker and Cable termination compartment are designed for internal arc protection.

Protection & Control:

LV control and protection apparatus is mounted in separate compartment installed on front side of the switchgear panel. The Switchgears offered are compatible with modern relays and monitoring equipment