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ABB KOKS 24 (25) kV Indoor Current Transformer Datasheet

Summary

Measure medium voltage systems precisely with these KOKS 24(25) kV Indoor Current Transformers. This comprehensive guide provides power engineers and electrical designers with all necessary technical specifications for reliable metering solutions. The manual features detailed core selection tables based on current capacity and burden, coupled with installation guidelines, dimensional drawings, and connection details. Use this resource to ensure accurate, compliant integration of your transformer units into critical medium-voltage distribution networks.

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MEDIUM VOLTAGE PRODUC

KOKS 24(25) k V Indoor current transformers

Page Summary Contents For ABB KOKS 24 (25) kV Indoor Current Transformer Datasheet

Page 1 MEDIUM VOLTAGE PRODUC KOKS 24(25) k V Indoor current transformers
Page 2 KO S 2 5) K V I R C ENT TR NSFO ER Technical parameters Value Highest voltage for equipment 24(25) k V Power frequency test voltage, 1 min. 50 k V Lighting impulse test voltage 125 k V Rated short-tim...
Page 3 Dimensional Drawing D = MAX. CIRCLE AROUND BUSBARS KOKS 24 D 11 KOKS 24 D 21 KOKS 24 F 11 KOKS 24 F 21 A [mm] B [mm] C [mm] D [mm] Marking of current transformer outlets - example a) Single-core desig...
Page 4 KO S 2 5) K V I R C ENT TR NSFO ER Core selection table for types KOKS 24 D11 and _D21 Rated continuous thermal current: 1.2 x Ipn except for 6 000 A where rated continuous thermal current is 1.0 x Ip...
Page 5 1V LC ev .4 , e .0 2. TA We reserve all rights in this document and in ABB s.r.o. We reserve the right to make technical the subject matter and illustrations con- ELDS Brno changes or modify the conte...

Manual Details

Brand Current
Pages 5
File Size 551.38 KB
Published June 05, 2026
22 views

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Frequently Asked Questions

What is the maximum operating voltage?

The highest voltage for this equipment is 24(25) kV.

How must core sizes be determined for installation?

Core size is determined by the primary voltage, accuracy class, and burden when the secondary current is 5 A and the frequency is 50 Hz.

What are the allowable conductor types for KOKS 24 D11?

Conductors of KOKS 24 D11 can be 2.5...10 sq. mm or 2x2.5...2x6 sq. mm.

Can the protection cores in the transformer be linearized?

Yes, the protection cores can be linearized if needed.