Self Protected Transformers (CSP) offer a complete and safe solution against lightning, switch surges and servere secondary overloads.

Benefits :



Higher Transformer Availability : Available for a longer duration than conventional transformers. Internal breaker (Type CLR) is tripped by a standard Bi-Metallic thermal trip element, which integrates oil temperature and secondary current flow, allowing the transformer to continue to operate even under overload conditions, until the oil temperature makes coil damage imminent. Improvised CQR Type breakers can also be provided which are furnished with instantaneous magnetic trip element in addition to the Bi-Metallic thermal trip element.

More Reliable Service : CSP Transformers efficiently and effectively disconnect the load from the transformer under overload conditions. Moreover CSP components help in identifying locations where improvements in load management may be necessary.

Lower System Cost : Considering the operating costs of energy supply and replacement cost of the transformers that have failed prematurely due to overload. CSP transformers would no doubt fair better than conventional ones.

Easier an Simpler Installation : Involves only one piece of electrical equipment, the transformer and only one high voltage electrical connection to the distribution line.

Safer Operation.

Standard Fittings :



Internal Low Voltage Circuit Breaker

Internal High Voltage Protective Link

Signal Light

Operating Handle

Lightning Arrester

Rating and Diagram Plate

Primary Bushings

Secondary Bushings

Optional Fittings :



Terminal Connectors

Pressure Relief Device / Explosion Vent

Cable Box

Rollers (Uni-Directional / Bi-Directional)

Arcing Horns

Free Breathing / Hermetically Sealed

Cable Terminations

Technical Specification :



Ratings : Single Phase : CRGO - Upto 167 kVA

AMT : Upto 167 kVA

Three Phase : CRGO - Upto 315 kVA

AMT : Upto 315 kVA





Number of Phase : Single Phase and Three Phase

Applicable Standards : IS, IEC, AnSI, JIS, BS etc.

Cooling : ONAN, OA

Insulating Fluid : Mineral Oil to specification

Frequency : 50 Hz, 60 Hz

Polarity : As specified

Primary voltage : Upto 11 kV

Secondary Voltage : 415, 433 V (Other Voltages as required)

Winding material : Copper / Aluminium

Taping range : ± 5% in steps of 2.5% (Other tapings as required)

Impedance : In line with applicable standards.