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KO K M C A B L E C U R R E N T I N S T R U M E N T T R A N S F O R M E R S
4
I N S T R U C T I O N F O R I N S TA L L AT I O N , U S E A N D M A I N T E N A N C E
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3. Instructions for installation
02 Window type 4 holes:
0
Fixation is done by 4
straight-through holes
with 15 mm diameter.
General informations
Screws for fixation are
Instrument transformer is an electrical equip-
not part of delivery. For
exact dimension see the
ment and the electrical installation of the instru-
catalogue for specific
ment transformer can be done by skilled person-
type. Connection of
transformer primary
nel only. The level of experience, age and
side.
eligibility criteria for persons working with, on or
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near electric installations is governed by national
03 Window type 2 holes:
legislation. If no such eligibility legislation is avail-
Fixation is done by 2
straight-through holes
able the corresponding requirements can be
with 12 mm diameter.
found in EN 50110-1 standard.
Screws for fixation are
not part of delivery. For
exact dimension see the
catalogue for specific
type.
Safety instructions
1. Always consider the transformer as a part of
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04 Ring core type, with
electric circuit which it is connected to. Don´t
base: Fixation is done by
touch incoming connectors and terminals, or
2 or 4 holes in the base
of transformer. Screws
any other parts of the transformer, except you
for fixation are not part
know for sure these are earthed.
of delivery. For exact
dimension see the cata-
logue for specific type.
2. Ground always the metallic base of the instru-
ment transformer, if exist.
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05 Ring core type,
3. Connect always one terminal of each secondary
without base : Fixation
is done by 4 nuts casted
winding of the transformer to the earth. When
in the transformer.
the secondary of transformer is intercon-
Screws for fixation are
not part of delivery. For
nected, there should be only one grounded
exact dimension see the
point to prevent accidental paralleling with sys-
catalogue for specific
type.
tem grounding wire.
4. Always short-circuit the secondary of the cur-
rent transformer, which is not currently in use,
to prevent secondary voltages, which may be
hazardous to personnel or damaging to the
transformer's secondary. The secondary like
this must be additionally grounded.
Mounting
The KOKM type transformers are designed for
low voltages of 0.72/3 kV KOKM 06 and KOKM 072
or 1.2/6 kV (KOKM 1), without built-in primary
conductor. Their use at higher voltage levels
needs always the transformers to have combined
with primary conductor provided with its own in-
sulation. The primary conductor is not a part of
transformer delivery. Therefore, the KOKM trans-
formers are mounted and placed at the option of
the customer, based on the application chosen
and the insulated conductor used on the primary
side. Types of the transformer fixation are visible
on Fig. 2 – Fig. 5.
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02
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03
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04
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05
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