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Outdoor
Oil cooled Current Transformer
 General
Information:
Oil cooled transformers are
made for use on various systems ranging from 11kv to 33kv.
the basic construction of the CT is similar to CT of all voltage
classes in that the core is placed in a tank mounted on top
of the bushing and adequate paper insulation is provided on
it. The secondary leads are run through the bushing to the
secondary terminal box placed at the bottom of the bushing.
 The
advantage of this type of construction is that the transformer
is dynamically more stable under short circuit conditions,
the various forces on the primary conductors tending to balance
on another. Requisite number of the primary turn are put on
the core and the two ends are bought out for connection into
the system. The primary ends are terminated on the terminals
30 mm dia 80mm long for easy connection into the system.In
the case of two ratio current transformer in which the different
ratios are obtained by primary reconnection, four primary
terminals are brought out on the tank(corresponding to the
two primary windings) and these are connected in series or
parallel, by connecting links provided depending upon the
ratio required. The transformers are fully sealed in construction
and are supplied filled with required quantity of oil. Adequate
allowance is made for expansion of oil due to temperature
variations and as such a breather is considered unnecessary.
Since the transformer oil
is never exposed to atmosphere the danger of its contamination
is completely avoided. It is therefore not necessary to clean
the oil during the life of the transformer. Oil fills and
oil drains are, therefore not provided on the current transformers
for voltages less than 132kv. For current transformers for
132 kv systems, oil fill and oil drain is provided but these
are purely for manufacturing convinience and these are fully
sealed before despatch.
This
product is type tested at ERDA, Baroda
| Technical
information required for tendering |
- Ratio
- Number
of Cores
- VA
Burden
- Accuracy
Class
- Rated
Short Time Current Rating
- Voltage
Class
- System
conditions
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