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CU R R E NT TR A N S FOR M E R S FOR G A S - I N SU L ATE D SWITCHG E A R T YPE E LK 


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02

The connection schema nameplate is placed un-
der the cover of the terminal box.

3. Instruction for installation

General information

The instrument transformer is 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 the EN 50110-1 standard. 

Safety instructions

1.  Always consider the transformer as a part of 

electric circuit which it is connected to. Don’t 
touch incoming connectors and terminals, or 
any other parts of the transformer, unless you 
know for sure these are earthed. 

2.  Always ground the metallic base of the instru-

ment transformer.

3.  Always connect one terminal of each secondary 

winding of the transformer to the earth. When 
the secondary of the transformer is intercon-
nected, there should be only one grounded 
point to prevent accidental paralleling with the 
system grounding wire. 

4.  Always short-circuit the secondary of a current 

transformer that is not currently in use, to pre-
vent secondary voltages, which may be hazard-
ous to personnel or damaging to the trans-
former’s secondary. The secondary, like this, 
must be additionally grounded.

Connection of transformer primary side

The ELK - CN transformers don’t have their own 
primary conductor. If ELK - CN transformers will 
be used in other applications than ABB switchgear 
ELK-3, ELK-14 or ELK-14/245C please contact us 
for support.

Attention:

 a primary conductor must be centred 

in the application with tolerance ±1cm.

Connection of transformer secondary side

For all current transformers, the secondary cable 
connections must be led to a terminal box. The 
transformers ELK - CN contain an outlet cable 
which is connected to the terminal on the DIN rail. 
If not specified otherwise in the order, the cable 
cross-section may not exceed 6mm2.The termi-
nals are equipped with M4 screws for connection 
of the secondary outlets. Maximum allowed 
torques for secondary screw connections:

Highest and lowest allowed torque values 
for secondary screw connections

Screw

Highest torque (Nm)

Lowest torque (Nm)

M4

1.8

1.5

The end of the windings of all cores are corre-
spondingly identified. Terminal arrangement ac-
cording to the number of terminals and parame-
ters of transformer. The type of terminals and 
terminal arrangement may be changed by the 
customer after agreement with the manufacturer.

 


03


02  Example of current 
transformer connection 
schema nameplate


03  Example of a sec-
ondary terminal board 
of the ELK - CN type 
transformers

Содержание ELK Series

Страница 1: ...PRODUCT FOR HIGH VOLTAGE APPLICATION Current transformers for Gas insulated switchgear type ELK Instructions for installation use and maintenance...

Страница 2: ...y instructions 5 Connection of transformer primary side 5 Connection of transformer secondary side 6 Mounting 7 4 Instructions for use 7 Routine test report 7 5 Maintenance instructions before install...

Страница 3: ...Where 1 CN14C type code of transformer ELK CN3 720 ELK CN3 1080 ELK CN14 560 ELK CN14 840 CN14C 2 2016 year of manufacture 3 1VLT serial number 4 50 60 Hz rated frequency 5 IEC 61869 1 2 correspondin...

Страница 4: ...nt secondary voltages which may be hazard ous to personnel or damaging to the trans former s secondary The secondary like this must be additionally grounded Connection of transformer primary side The...

Страница 5: ...onduc tor and whole transformer clean the sealing sur face and inside surface of the transformer from dust grease and another impurities see 5 Main tenance instructions For each type of ELK CN transfo...

Страница 6: ...ve to be protected from direct impact of solar radia tion The transformers are delivered according to delivery instruction HASV600377 7 Disposal Materials used in instrument transformers are considere...

Страница 7: ...n agreement between the customer and the manufacturer The specific standard is always mentioned on the transformer ratio nameplate As an example the following standards can be mentioned IEC 60044 1 IE...

Страница 8: ...8 CURRENT TR ANSFORMERS FOR GAS INSUL ATED SWITCHGEAR TYPE ELK Appendix 1 Examples of electrical wiring Current instrument transformers...

Страница 9: ...9 Appendix 2 Dimensional drawings Weight of the transformer depends on the number of cores and their parameters ELK CN3 1080mm ELK CN3 20mm...

Страница 10: ...10 CURRENT TR ANSFORMERS FOR GAS INSUL ATED SWITCHGEAR TYPE ELK ELK CN 14 840mm ELK CN14 560mm...

Страница 11: ...11 CN14C Configuration A0001 CN14C Configuration A0002...

Страница 12: ...e lack of information in this document We reserve all rights in this document and in the subject matter and illustrations con tained therein Any reproduction disclosure to third parties or utilization...

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