Compact Substations (India)

UNITIZED SUB STATION

The unitized substation is a state-of-the-art-system which simplifies conventional substation design. M/s Skipper’s (ISO 9001 certified co.) fully engineered factory built design, is tailor made to customer needs. The company takes the total responsibility of engineering and building the complete USS, with fit and forgets technology. The Quality is guaranteed as all components of USS are subject to stringent internal quality checks. The housing is made from a composition of Aluzinc Sheet Steel having thickness of 2 mm,1.5 mm mild steel and 4mm structure member base frame and then powder coated.

SALIENT FEATURES

• Compact in construction, occupies less floor space and does not effect the elevation of commercial complex.
• Easy to operate and maintain.
• In accessible to live parts.
• Fully compartmentalized design.
• Substation housing is divided into three segregated compartments i.e. the HV compartment, the transformer compartment and the LV compartment.
• All fasteners are SS/Steel Zinc plated.
• The roof is special, heating due to solar radiation is minimized by the use of double skin roof and having slanted top. Air insulates the substation from the effect of sun radiation and specially designed ventilation opening facilitate air circulation, thereby supporting complete cooling system.

The HV Compartment

• It comes in two versions i.e. Vacuum Circuit Breaker RMU & H V Fuse RMU and load break switch
• Normally M/s Skipper utilizes vacuum circuit breaker together with a self powered over current protection system in place of switch fuse switch combination. The RMU has been designed and tested to IEC62271-100, IEC60298 & IEC60694.

Standard Features of RMU

• 12KV Vacuum circuit breaker.
• Common switching chamber with sealed SF-6 environment.
• Pressure indicator and SF-6 recharging facility
• Enhanced electrical performance.

The Transformer Compartment:

The compact substation incorporates our own make Distribution Transformer which is designed and made strictly as per IEC60076 and IS2026 specifications. The transformer compartment is fitted with removable bolted cover with louvers and sand traps. This design allows maximum ventilation and prevents ingress of sand or its accumulation in door cavities.

The LV Compartment

This compartment encloses the LV Distribution Board which is connected to LV bushing of the transformer. The LVDB can be designed to meet various application and requirements having

• MCCBS and ACB
• LV fuse switch units
• Instrumentation and metering
• Load feeders

Connection Between Compartments

Specially designed Elastamould HV bushings have been provided for complete safety of equipments. The connection between the transformer and the RMU is made with XLPE insulated cable.

Main Advantages Of Unitized Sub- station

• Custom built design and suitable for constant mobility. This provides a high flexible power supply points without much difficulties.
• Reduced Electrical losses as package substation can be provided in the center location of load.
• Total economy in cost. Even site cable cost is minimized as the transformer is directly connected to LV switch board.
• A high degree of safety and operational reliability is achieved by HT and LT switchgears and protective relays to avoid overloading.