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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
6
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
The use of current transformer for other purpose
then described above is forbidden if not agreed
with the producer.
Routine test report
The routine test report of a current instrument
transformer includes:
a) verification of terminal markings;
b) inter-turn overvoltage test;
c) determination of errors.
On customer request the following information
can be provided free of charge:
• theoretical current/voltage error and phase dis-
placement values;
• theoretical excitation (magnetization) curves.
Additional reports for supplementary charge,
made available on request:
• test report on accuracy;
• excitation (magnetization) curves;
• additional nameplates (if more than 2 are re-
quired);
verification tests for measuring cores (classes
0.2; 0.2 S; 0.5; 0.5 S).
5. Instructions for maintenance
Excessive dust sediments or any other type of
contamination must be removed from the trans-
former by a soft brush, in a way not to damage
the insulation or cables taken out from the trans-
former.
6. Transport & Storage
Permitted temperature for transport and storage
ranges from -40°C to +70°C. During transport and
storage the transformers have to be protected
from direct impact of solar radiation. The trans-
formers are delivered in wooden crates or fixed
on transport pallets.
7. Disposal
Materials used in instrument transformers are
considered as materials without environmental
impact and materials are not toxic. Instrument
transformers have to be disposed of in accor-
dance with national legislation relevant to do-
mestic waste disposal.
8. Handling
Most of the KOKM transformers weight less than
25 kg and, consequently, they can be handled
manually. In case of higher weight it is necessary
to use carry belts threaded through the trans-
former internal opening.
ATTENTION:
The process of transformer han-
dling has to comply the occupational health and
safety rules. It is forbidden to stay or move be-
low a suspended load. Always make sure the
load is safely tied and secured, what makes its
loosening or turnover impossible. All transform-
ers has to be carried carefully to prevent any
damage to the transformer.
9. Normative references
IEC 61869-1 Current instrument transformers
IEC 60529 Degrees of protection provided by en-
closures
ISO 12100 Machine safety – basic concepts, gen-
eral principles of design
EN 50110-1 Operation of electrical installations
Current instrument transformers are designed,
tested and manufactured in accordance with in-
ternational or national standards, the customer
requirements, based on an agreement between
the customer and the manufacturer. The specific
standard is always mentioned on the transformer
nameplate.
As an example the following standards can be
mentioned:
IEC 60044-1; IEC 60044-6; IEC 61869-1;
IEC 61869-2;
AS 60044-1; AS 1243-1982;
ČSN 351301; ČSN 351361;
ČSN EN 60044-1; ČSN EN 60044-6;
IEEE Std C57.13.6-2005;
ANSI C57.13-1978;
CSA Std CAN3-C13-M83;
GOST 1516.3-96; GOST 7746-2001;
BS 3939:1973; BS EN 60044-1.
When agreed transformers made in accordance
with other standards can also be supplied, or in
accordance with other release version of the
above standards.
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