ELECTRIC MACHINES || What is no load current on Xmer ? || Draw the circuit diagram for open circuit test on single-phase transformer ?||Describe sumpner`s test on transformer with neat diagram?||Draw the circuit diagram for load test on single phase Xmer?

What is no load current on Xmer ?

When the secondary winding of transformer is open (no load connected) and supply voltage source is connected to the primary side on Xmer , So the current is flowing in primary circuit is called no load current . which is represent by Io .

Draw the circuit diagram for open circuit test on single-phase transformer ?

Open circuit

Draw the circuit diagram for short circuit test on single-phase transformer ?

Short circuit

Describe sumpner`s test on transformer with neat diagram?

The open and short circuit test cannot be used foe the 'heat run' test wherein the purpose is to determine the steady temperature rise if the transformer was fully loaded continuously ; this is so because under each of these test the power loss to which the transformer is subjected is either the core loss or copper loss but not both . The way out of this impasse without conducting an actual loading test is the SUMPNER`s test which can only be conducted simultaneously on two identical transformer .

Sumpner`s test

Draw the circuit diagram for load test on single phase Xmer?

Circuit diagram for load test

GK_GOURAV