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1.1 About this device
1.1.1 What is the device?
This device is a ICO type current transformer for outdoor use. The
current transformer is used to convert high alternating currents into
smaller, directly measurable currents according to the principle of the
inductive transformer. The secondary side is galvanically separated
from the primary side.
Other special properties of the ICO type current transformer are:
» The transformer is oil-paper insulated and hermetically sealed.
This protects the oil-paper insulation from external influences and
oil maintenance is not required. A high-quality PCB-free insulating
oil in accordance with IEC and ASTM is used for insulation.
» The external insulation is provided by a polymer hollow core insu‐
lator. This consists of a glass-fibre reinforced inner tube to which
silicone shields with aluminium flanges are attached on the out‐
side. The screws on the insulator flange and the fittings at the top
and bottom are made of stainless steel and are tightened at the
factory according to the specifications.
» Composite and porcelain insulators are available to cope with dif‐
ferent degrees of pollution and load classes. The standard model is
already designed for 31 mm/kV and load class 2.
» Corrosion-resistant components, a stainless steel expansion cell
and chambered O-ring seals ensure that it is maintenance-free
over the entire product life cycle.
» High-voltage windings with double enamel-coated magnet wire
ensure insulation between the windings.
» To change or vary the transformation ratio of a transformer, the
secondary windings can optionally be tapped (special equipment,
Chapter 1.4.2 Secondary tapping on page 11)
» The secondary connections are located in the marine-grade cast
aluminium terminal box at the front of the transformer base. A
removable and field drillable aluminium plate is available on the
underside of the terminal box for the customer's cable glands. The
terminal box is prepared for the operation of an optional condensa‐
tion heating element.
» The electrical configurations from 72 kV nominal voltage up to the
voltage series listed on the device, maximum 245 kV, allow connec‐
tion to digital and conventional measuring and protection devices
such as switchgear, switching device combinations and power dis‐
tribution systems in connection with secondary devices (relays,
meters, indication instruments).
ICO 72,5...245
USER MANUAL
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