Package Substation – Power Star image image

Package Substation (Unitized Substation Transformer)

RANGE : Upto 2000 KVA in 11 KV Class.


Power Star offers qualitative range of PSS (Package Substation) or USS (Unitized Substation) Transformer from 200 KVA to 2000 KVA in 11 KV Class. These Package Substations are largely required for fire hazardous and compact places. A unitized substation is a compact arrangement, which simplifies conventional substation design. Substation housing is divided into three compartments i.e. the HV Compartment, the Transformer Compartment and the LV Compartment.


  • Reduced electrical losses as USS can be installed near load centres.
  • Total economy in cost.
  • Higher degree of safety and operational reliability is achieved by HT and LT switchgears and protective relays to avoid overloading.
  • Reduction in logistic cost as USS is delivered as a single unit.
  • Low civil / foundation cost.

Unitized Sub Station Configuration Components

HV Compartment Transformer Compartment LV Compartment
Extendible & Non Extensible MV Switchgear – Ring Main Unit (RMU)
Oil Immersed Transformer /

Dry Type Transformer (VPI)

LV Distribution Board
Vacuum / SF6 Circuit Breaker, RMU & HV Fuse. LT Control Panel with Incomer ACB & Outgoing MCCB
RMU & Load Break Switch. APFC Panel
Protection & Metering Devices. LV Switch fuse unit
Current & Potential Transformer for Metering / Protection. Instrumentation and Metering

Internal Lightning & Door Limit Switches, Tailor made enclosures mounted on the transformer under base to provide single lift complete
installation with theft proof design.


USS (Unitized Sub Stations) / Package Sub Station are ideally suited for new residential and commercial complexes as it can be placed on Ground, partially or totally below / above ground level. Mainly used by Power Utilities, Multiplexes, Hotels, Hospitals, Shopping Malls, Software Parks, Residential Complex, Airport etc.

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