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72 • Appendix H: Eagle Transformer Gas Tester Model Eagle Instruction Manual
Appendix H: Eagle Transformer Gas Tester Model
This Eagle Transformer Gas Tester Model is specially set up for
electrical transformer gas testing. Large electrical transformers are
filled with oil which surrounds the transformer coils, and they have
an inert gas head space above the oil. When a transformer begins to
fail, electrical arcing between the conductors of the coils can cause
flammable gases to form in the head space. By testing the head space
for these gases, and recording trends of the readings, an early warning
of transformer failure can be determined, and the transformer can be
removed from service before it explodes.
Description
This combustible sensor, which is a catalytic combustion type, is
calibrated to and the instrument is setup for hydrogen with a range of
0 - 5.00% volume. Since the headspace being tested is filled with
nitrogen, there is not oxygen in the test sample. The catalytic sensor
requires oxygen in order to operate, so the instrument is supplied
with a snap-on dilution fitting with a dilution ratio of 1:1 (one part air
to one part sample). This fitting blends the sample with ambient air
before entering the instrument, which provides sufficient oxygen for
the sensor to work. The instrument is also supplied with a sample
bag.
Operation
1. Turn instrument on and allow it to warm up.
2. Attach the dilution fitting directly to the front of the instrument,
and the plastic probe to the dilution fitting.
3. Press the “AIR” button in fresh air to zero the instrument.
4. Connect the deflated sample bag to the sample valve on the
transformer, and open the valve slightly to fill the sample bag.
Close off the sample bag and remove it from the transformer
valve.
5. Attach the sample bag to the EAGLE probe, and open the sample
bag.
The sample will now be drawn into the instrument. After about 45
seconds note and record the display reading. Compare this
reading to historical data to determine the condition of the
transformer.