Raytech USA, Inc.
All rights reserved. No portion may be reproduced without written consent.
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SYSTEM DETAILS:
5 – 0
System Check:
The instrument is Line operated. The system is designed to be used with voltage power sources
(mains power) between 90-260 Vac 50/60Hz. The system performs a self check each time it is
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 system is specially designed to test all transformer windings.
Low Resistance Testing:
The WR50-12 utilizes the 4 wire measuring technique. The points where the potential leads are
connected determine the resistance reading. The test set employs a very simple principle of
Ohm’s law:
R
=
V
/
I
R
= Resistance,
V
= Voltage,
I
= Current
Discharging Transformer Windings:
The WR50-12, as well as all of the WR50 series, are specialized systems designed to measure
transformer windings. These systems are equipped with heavy duty discharge circuits that are
very unique in the market!
The internal discharge circuit dissipates the stored energy in the transformer windings with
Constant Power Discharge Circuit which is unique to all transformer winding test systems.
That is the reason why Raytech systems can discharge transformers more then 10 times faster
then 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 in the case where a current lead may become detached.
DO NOT USE A SMALLER GAUGE POTENTIAL (VOLTAGE) CABLES THEN
ORIGINAL CABLES SUPPLIED!
Demagnetization:
Upon completion of a transformer winding resistance test the core material may become
magnetized due to the Direct Current that had been applied to the Windings. This magnetization
of the core must be removed prior to energizing the transformer for use.
The WR50-12 incorporates a demagnetization circuit which will automatically evaluate the
magnitude of the magnetization of the core and reduce it to a safe level. This process is
performed quickly and safely.
