Raytech WR14 - Discharging the Transformer Windings; Low Resistance Testing

Version 3.03
WR14 / WR50-12/13 Winding Resistance Meter Instruction Manual
10
DISCHARGING THE TRANSFORMER WINDINGS
The WR systems are specialized systems designed to measure Transformer windings. These systems
are equipped with heavy-duty discharge circuits that are very unique in design.
The internal discharge circuit dissipates the stored energy in the transformer windings with a “Constant
Power Discharge Circuit” that is unique to all transformer winding test systems.
That is the reason why Raytech systems can discharge transformers more than 10 times faster than any
other system on the market.
If a cable happens to fall off during test, the system will STILL discharge the test object safely with the
automatic Constant Power Discharge Circuit.
The Potential Test Leads are part of the safety circuit and have the ability to discharge a transformer
should one of the current leads become detached.
WARNING!
Do not use potential cables with smaller gauge cables (Channel 1, 2, or 3)
than the original Raytech cables supplied!
LOW RESISTANCE TESTING
The WR series of test instruments utilize a 4 wire measuring technique for each Channel. The points
where the potential leads are connected determine the resistance reading.
The test set employs a very simple principle of Ohm’s law:
where
R = Resistance
U = Voltage
I = Current