KOTD Type Current Transformer

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Product features
• 15-34.5 kV, outdoor, 110-200 kV BIL, 60 Hertz
• Window diameter: 4.0"–5.0" (102 –127 mm)
• KOTD-110: 15 kV, 110 kV BIL- Strike: 10.0" (254 mm)- Creep: 18.0" (457 mm)
• KOTD-150: 25 kV, 150 BIL- Strike: 12.5" (317 mm)- Creep: 25.0" (642 mm)
• KOTD-200: 34.5 kV, 200 kV BIL- Strike: 15.0" (381 mm)- Creep: 36.9" (937 mm)

Application
KOTD current transformers are designed for high
current metering and relaying in substation
applications, and are available with a 4.0" or 5.0"
diameter window opening or primary bar assembly
with spade terminal. They are available with one, two,
three, or four cores for single, dual, or multi-ratio
designs. Multi-ratio is only available in one and two
core designs.

Construction features
The KOTD construction is a single cast polyurethane
assembly with 4.0" or 5.0" diameter brass tube to
prevent corona. The polyurethane supports its own
weight in any orientation, but is not intended for
supporting external bus work. The polyurethane is
rated for ambient operating temperatures ranging
from -30°C through +50°C.

High accuracy and extended range
Specialty KOTD transformers are also part of ABB’s
AccuRange® current transformer (CT) family and
deliver high accuracy and stable performance over a
wide load swing, making them a great fit for variable
load applications. Accuracy is guaranteed to exceed
the 0.15S class with +/-0.15% error from 1% of
nominal current through the rating factor. ABB’s
extended range units deliver savings through
improved accuracy metering and reduced inventory.

Terminals
Secondary terminals are bronze clamp-type, suitable
for #14 through #1 AWG wire. Terminal screws are
slotted, round-head type. For single core designs, a
rotatable shorting bar is positioned on a center post
located midway between the terminals. The center
post also serves as a third terminal on dual ratio
transformers.
Primary bars are electro-tin plated, sized for the
maximum rated continuous current (primary current
X rating factor), and have standard NEMA 4-hole pads
for connection. The primary bar assembly consists of
one, two, or three 0.5" tin-plated copper bars,
depending on the current and rating factor of the CT.
For bar kits that have more than one bar, spacing
pads are recommended and available separately.

Shorting
A retained bronze pivoting short circuit device is an
integral part of the KOTD secondary terminal
arrangement. The CT will arrive with the short
circuiting device positioned between the two
terminals where it touches and shorts the terminals in
single, dual, and multi ratio arrangements. When
rotated out of the shorted position, current will flow
through the transformer. To ensure safety, this
shorting device should remain in place until the CT is
installed and ready to be energized.

Junction Box
The junction box has a 1" conduit hub on either end
and a knockout for a 1" conduit fitting on the bottom.
The box is anchored to the body of the transformer
with screws and can be easily detached, simplifying
installation and change-out procedures.
Inverted units require the weep holes in the junction
box to be filled/covered to prevent water ingress.

Mounting
The base is constructed of 0.38" thick, 6061-T6 grade
aluminum. The base is attached to a steel frame cast
in the unit using stainless steel screws. Both the
window and bar-type KOTD can be mounted in the
upright, upside-down, and cantilever positions. In the
case of cantilever mounting, the primary can be
mounted vertically without support, or horizontally
with the load supported independently.

Test and compliance
Single and dual core designs meet or exceed all
requirements of IEEE C57.13-2016, while three and
four core designs are compliant with IEEE C57
13.1993. The KOTD can also be tested to other
standards as requested. Full production test results
are reported by unit serial number and are available
upon request.

Options
• 4" window available upon request. (If bar kit is
needed for 4" window, the bar(s) will be 4" wide as
opposed to 5" wide.)
• Optional primary bar kits for field installation
available separately.

KOTD Type Current Transformer | ABB

Description

KOTD Type Current Transformer | ABB

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