Instrument Transformer, Div of GE 188 Data Sheet

GE

Energy Connections

Model 188

Current Transformer
Auxiliary Transformer

Application

For use in the secondary of current
transformers to change ratio for
metering applications.

Frequency

50-400 Hz.

Insulation Level

600 Volt, 10 kV BIL full wave.

Continuous Thermal
Current Rating Factor

1.5 at 30 °C. amb., 1.0 at 55 °C. amb.

Terminals are No. 10-32 brass binding
headscrews.

Approximate weight 10 lbs.

** The circuits of up to six 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.

Model 188 Auxiliary Transformer

ANSI Metering Class: 0.3 B0.2
* Exception: These ratios have no accuracy ratings.

The Model 188 is a low ratio auxiliary current transformer,
suitable for primary currents up to 15 amperes. The table on the
previous page lists the most common current ratings. The
transformer core and coil are encapsulated in a polyurethane
resin, which also secures the steel mounting base.

Since the Model 188 is used in the secondary of another
transformer it has no voltage rating. It is given a 2500 volt 60 Hz
high potential test. It is designed to be used on circuits not to
exceed 600 volts to ground or between windings.

Grid-AIS-L4-ITI_Model_188-1268-2017_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.