GE
The Model 81 is a low ratio primary current transformer, suitable for primary currents up to
Energy Connections
Model 81 Wound Primary
Model 81X Auxiliary Transformer
Current Transformers
Frequency
50-400 Hz.
Insulation Level
600 Volt, 10 kV BIL full wave.
Continuous Thermal
Current Rating Factor
1.33 at 30 °C. amb., 1.0 at 55 °C. amb.
Terminals are brass studs No. 8-32 with
one flatwasher, lockwasher and regular
nut, for ratios up to 25:5 and 1/4-20
studs for higher ratios.
Order mounting bracket kit
No. 0221B00259
Approximate weight 18 lbs.
50 amperes. The table lists the most common current ratings.
* 1/4-20 stud terminals
Model 81 Wound Primary & Model 81X Auxiliary Transformer
** The circuits of up to five secondaries may be totalized. Equal or unequal line current transformers can be summed with this transformer. Advise the ratios of
the line current transformers to be totalized for unequal ratios. Output terminals are X1-X2.
ANSI Metering Class: 0.3 B1.8
The Model 81X is an auxiliary transformer for use in the
secondary of main current transformers to change the ratio for
metering applications.
Since the Model 81X is used in the secondary of another current
transformer it has no voltage rating. It is given a 2,500 volt 60 Hz
high potential test. It is designed to be used on circuits not
to exceed 600 volts to ground or between winding.
Grid-AIS-L4-ITI_Model_81-1230-2017_05-EN. © Copyright 2017. General Electric Company
and Instrument Transformers LLC reserve the right to change specifications of described
products at any time without notice and without obligation to notify any person of such changes.