Page 245 - Electrician - TT (Volume 1)

ELECTRICIAN - CITS

Transformer Classification

Terms of number of windings
Conventional transformer: two windings
Autotransformer: one winding
Others: more than two windings

In terms of number of phase
Single-phase transformer
Three-phase transformer
Depending on the voltage level at which the winding is operated
Step-up transformer: primary winding is a low voltage (LV) winding
Step-down transformer: primary winding is a high voltage (HV) winding

In terms of power rating and application
• Distribution transformer
• Power transformer
• Instrument transformers
Parts Of Transformer
1 Pressure release Device
2 Buchholz relay

3 Oil inlet valve
4 Breather
5 Silica Gel
6 Explosion vent
7 Conservator
8 Diaphragm

9 Oil level indicator
10 HT Terminal

232

CITS : Power - Electrician & Wireman - Lesson 41-49