3.3 System Details
System Check:
The instruments are line operated
. The systems are designed to be used with AC Voltage power
sources between 90 to 264VAC 47…63Hz. You will find a description and additional information in
chapter 5.1.2.1 for the WR100. The systems perform a self-check each time that they are powered
on. The User should always visually inspect all connectors, cables and devices to be measured to
avoid any safety issues.
Limitations of Winding Resistance Testing:
In general, there are no limitations on testing low or high inductive windings of transformers.
The test systems are specially designed to test all transformer windings.
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 a smaller gauge potential cables (Channel 1, 2, or 3) then the
original Raytech cables supplied!
3
The WR14-R has a battery operated option in addition to mains power
Instruction Manual Winding Resistance Meter
Type WR100 / WR50 / WR14
Page 14 of 139
