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Instructions for installation, use and
maintenance for current instrument
transformers
These installation, use and maintenance instructions apply for current instrument
transformers intended for outdoor operation. The instructions refer to current
instrument transformers of the following types:
AT41 – up to 10 000 A; up to 1.2/6/- kV 40 kA(1s) and 100 kA
AT35 – up to 5 000 A; up to 1.2/6/- kV 100 kA(1s) and 120 kA
AT38 – up to 5 000 A; up to 1.2/6/- kV 100 kA(1s) and 120 kA
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1. Service conditions
01 Example of rating
plate
The transformers need to be installed in indoor
conditions where the ambient air is not signifi-
cantly polluted by dust, smoke, corrosive gases,
vapor or salts.
The transformers are designed for standard ambi-
ent temperatures between -20°C and +105°C and
altitudes below 1 000 m above sea level. The trans-
formers can also be operated at higher or lower
ambient air temperatures and higher installation
altitudes if such are agreed with the manufacturer.
Type: AT41-1055/670
1,2/6/- kV
1S1-1S2
Rb=3 Ohm, Kssc=10, Tp=100 ms
C-O-C-O t´-t´ al-tfr-t´´-t´´al=100-60-500-100-60 ms
Rct=10 Ohm, Ts=1,00 s, Ktd=27,2
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01
2. Technical details
Technical parameters and specifications of each
of the transformers are shown on a rating plate
fixed to the transformer body. It is not allowed to
operate the transformer at values exceeding the
rating plate data.
Dimensional drawing of AT transformer is shown
in Appendix 1. Dimensions of the transformer
may vary and depend on required parameters and
the application they are intended for. This is why
the customer is required to specify the highest or
lowest dimensions, in line with the dimensional
drawing in Appendix 1.
CURRENT TRANSFORMER
1
Ith:30(1s) kA
3
Idyn:75 kA
6
3 000/1A
7
ext.120%
8
3 VA
Where:
1)
2)
3)
4)
5)
6)
7)
8)
9)
10)
11)
12)
IEC 60044-1
2
4
50 Hz
5
Label abbreviation definitions
9
cl.TPY
10
3. Instruction for installation
2014
11
General information
Serial:1VLTS114000007
12
Instrument transformer is an electrical equip-
ment and the electrical installation of the instru-
ment transformer can be done by skilled person-
nel, only. The level of experience, age and
eligibility criteria for persons working with, on or
near electric installations is governed by national
legislation. If no such eligibility legislation is avail-
able the corresponding requirements can be
found in EN 50110-1 standard.
Safety instructions
1.
type code of transformer
corresponding standard
rated short-time thermal current
rated dynamic current
rated frequency
terminal marking for tap of transformer
rated transformer ratio
extended current
rated output (burden)
accuracy classes
year of manufacture
serial number
Always consider the transformer as a
part of electric circuit which it is con-
nected to.
Don´t touch incoming connectors and
terminals, or any other parts of the
transformer, except you know for sure
these are earthed.
3
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