Three singlephase two winding transformer each rated at 10 M

Three single-phase two winding transformer, each rated at 10 MVA, 66.4/12.5 KV, 60 Hz, with an equivalent series reactance of 0.12 are connected to form a three-phase bank. The High-Voltage side windings are connected in Y. A three- phase load operating under balanced condition on the high-voltage side receives 450 MVA at p.f. o.6 lagging, with VAN = 66/0 degree KV. Determine the voltage Van at the low-voltage side if the low-voltage winding are connected In Y In delta The base quantities of the transformer are: S_base3phi = 600MVA, V_baseLL=175 KV,

Solution

s it possible a screw touching the metal box is causing this?\"

If the hot screw touched a grounded metal box the circuit breaker would be tripped and the GFCI also (though the faster one will go first).

It the neutral touched a grounded metal box the GFCI would trip.

Check the connections.

Receptacle screws are tightened more than most folks think to ensure a gas tight connection that does not come loose under repeated thermal cycling as the receptacle heats up and cools down in use.

If the receptacle is wobbling around you may have worked a wire loose.

The plastic extension rings that go all the way around the front edge of the box are better than the smaller standoffs that just go on the device screws.