Transformers

Transformers Windinh Insulation Class A 100 deg

WtI  85 Trip at 95

Oti 75 85

How to set calibration gauge of WTI

Fault Current Calculation 

Calculation

NGR Resistance 15-20 ohm 

Current 200A

REF SEF Doubling Effect

 1. Doubling Effect

2. REF SEF

 Voltage 11000--------433

Current 165--------------4200

Fault Current = (Primary Current *100  ) / % Z

                       = (Secondary Current *100  ) / % Z

Secondary Voltage

11000            433

New eg 415V through Variac       ----------x

x= 433*415/11000

x= 16.335V

 Current

Voltage --- Current

11000------165

 415V    -------  x

x= 165*415  /  11000   = 6.225

 

03.04.2023 - Testing of HT Panel and Relay P3U30 Relay