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Traditionally, cold-rolled grain-oriented (CRGO) silicon steel has been widely used for the cores of distribution transformers and station service transformers due to its excellent magnetic properties and relatively low core losses. However, in recent years, a modern trend has emerged in the choice of core materials, especially for distribution transformers and, to some extent, station … Read more
Type Tests for the transformer Routine Tests on the Transformer Stage Inspection Tests On Core: On Coil On Tank Acceptance Tests
The clearance requirements for HV and LV terminals in the air are as follows:For 66 kV side, the phase-to-phase and phase-to-earth clearance should be 700 mm, and 660 mm respectively.For 12 kV side, the phase-to-phase and phase-to-earth clearance should be 280 mm, and 140 mm respectively. The following points should be noted for designing winding … Read more
What are the short circuit withstand levels for 400kV, 220kV, and 132kV transformers? Ans: 400 kV transformers must withstand 63 kA for 1 second. 220 kV transformers must withstand 50 kA for 1 second and 40 kA for 3 seconds. 132 kV transformers must withstand 40 kA for 1 second and 31.5 kA for 3 … Read more
A transformer is a static electrical device that transfers electrical energy from one circuit to another through electromagnetic induction, without any physical connection. It works only on AC supply and can step up or step down voltage levels without changing its frequency. The transformer consists of primary and secondary windings wound around a common magnetic … Read more
The Nitrogen Injection Fire Protection System (NIFPS) is designed to prevent and extinguish fires in oil-filled transformers, thereby safeguarding critical power infrastructure. This system operates on a “drain and stir” principle, effectively mitigating fire hazards through a coordinated sequence of actions. Working Principle of NIFPS As it is an protection system it first needs to … Read more