Instrument Transformer, Div of GE JAK-0W Encompass Data Sheet
GE
Grid Solutions
Model JAK-0W EncompassTM
Extended Range Revenue Metering Current Transformer
Application
EncompassTM is an extended range revenue metering current transformer. Model JAK-0W
is designed for both indoor and outdoor service. Suitable for operating meters and
instruments, on both single-phase two- wire circuits and polyphase circuits. The window
type transformer can also be used on three-wire single- phase circuits.
Features
Voltage Class: 0.6 kV
Frequency: 50-60 Hz
Window Size: 3.062”
Insulation Level: 10 kV BIL
Application: Indoor/Outdoor
Benefits
Light load test points extended beyond IEEE requirements plus high
rating factors allow for one Encompass unit to functionally replace
multiple standard ratios
Simplify CT selection and billing multipliers, improving productivity and
minimizing risk of error
Reduce inventory and part number requirements, reducing asset and
operational costs
(1) Exceeds IEEE definition for standard revenue metering accuracy.
Maintains 0.6 Accuracy Class from 4 % to 40 % of rated current and 0.3 Accuracy Class from 40 % through Rating Factor.
(2) Wide-base and secondary conduit box options available, upon request. Contact GE for more details.
(3) Other designs available, upon request. Contact GE for more details.
the bar; the other has a slot allowing it to be slipped over the bar where it
variety of chemicals. The polyurethane resin filling completely encapsulates
JAK-0W
Construction and Insulation
The core and coil assembly is encapsulated in resin within a molded case.
The case is molded with GE Valox thermoplastic polyester resin. This tough
material has excellent electrical and mechanical properties over a wide
temperature range, has low water absorption and is resistant to oil and a
the winding, leads and terminals to form a waterproof unit.
Core and Coils
The core is made from high quality grain oriented silicon steel, annealed
under rigidly controlled factory conditions. The secondary winding is made
of heavy enameled copper wire. The secondary windings are evenly
distributed around the core for maximum accuracy and resistance to stray
fields from adjacent conductors.
Terminals
Secondary terminals are tin plated brass, compression type with a 0.275”
diameter cross-hole for wiring and a 1/4-28 clamp screw. A shorting device
is provided and interlocked to the terminal cover. The terminal cover is
made of a clear plastic. Provision is made for sealing the cover.
Polarity
The H1 polarity mark is indented into the body, above the window at one
end. The X1 polarity mark is also molded into the body adjacent to the
secondary terminal. Both marks are white for visibility.
Nameplates
The nameplate is laser engraved aluminum. It is attached to the top of the
unit and has provision for attaching the user’s identifying tag. The nominal
current rating is marked on the side of the unit in large numerals.
Primary Bars (Optional)
Formed from flat copper bar, they are tin-plated. They can be supplied
mounted to the transformer, or separately for assembly into windowtype units; they can be rotated to bring the terminal pads into any
orientation. The bar is supported and held in place by two end plates,
which act as small animal barriers. One plate is permanently attached to
is held in place by two setscrews. Holes in the plate allow ventilation and
drainage of any water which might accumulate in the window. A
potential connector is provided, adjacent to the fixed end plate.
Baseplate and Mounting
The transformer can be mounted in any position and may be suspended
from the bus-bar or cable. It has provision for attaching three optional
bases. Bases are made from stainless steel. The high base increases the
transformer height to provide interchangeability with 600 V bar-type
current transformers.
Maintenance
These transformers require no maintenance, other than occasional
cleaning, if installed where air contamination is severe.
Grid-AIS-L4-ITI_Model_JAK_OW_E-1391-2017_08-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.
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