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Document DEVICE REPORTjU 5-- MEDIUM VOLTAGE PRODUC T KOKS 24(25) kV Indoor current transformers 2 KOKS 24(25) KV INDOOR CURRENT TRANSFORMERS Technical parameters Value Highest voltage for equipment 24(25) kV Power frequency test voltage, 1 min. 50 kV Lighting impulse test voltage 125 kV Rated short-time thermal current 100 x Ipn kA Rated dynamic current practically unlimited Rated continuous thermal current KOKS 24 D11 and _D21 6 000 A KOKS 24 F11 and _F21 8 000 A Description Cast resin body. Primary winding formed of a straight busbar to be mounted on the site of installation. At rated primary currents (Ipn>4 000 A) the cores are protected from the magnetic fields of the adjacent current busbars. Light-metal mounting frame with the secondary terminal box underneath (sealable terminal box). Two sizes. Core number 1...4. The protection cores can be linearized if needed. Without the mounting frame the transformer width is 400 mm. Conductors of 2.5...10 sq. mm or 2x2.5...2x6 sq. mm can be connected to the secondary terminals. Selection of transformer The core selection table shows how the 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. The core size total must not exceed the maximum core size. The core selection table is valid for the types KOKS 24 D11 and KOKS 24 D21 only. Max. core sizes KOKS 24 D 11 235 KOKS 24 D 21 345 Standards IEC 185 Other standards as requested 3 Dimensional Drawing 510 282 30 450 380 4X 360 420 18 C min. B 50 A D = MAX. CIRCLE AROUND BUSBARS A [mm] B [mm] C [mm] D [mm] KOKS 24 D 11 390 190 35 150 KOKS 24 D 21 500 245 75 150 KOKS 24 F 11 400 195 35 205 KOKS 24 F 21 510 250 75 205 Marking of current transformer outlets - example a) b) c) d) e) a) Single-core design | b) Double-core design | c) Three-core design | d) Single-core design, reconnectable on the secondary side | e) Double-core design, reconnectable on the secondary side 4 KOKS 24(25) KV INDOOR CURRENT TRANSFORMERS 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 Ipn Rated burden 10 VA 15 VA 30 VA 45 VA 60 VA Ipn/A Class Size Fs < Si Size Fs < Si Size Fs < Si Size Fs < Si Size Fs < Si [VA) [VA) [VA) [VA) [VA) 6 000 0.2 65 10 25 65 9 25 65 7 25 65 5 25 65 4 25 0.5 65 10 25 65 9 25 65 7 25 65 5 25 65 4 25 1 65 10 25 65 9 25 65 7 25 65 5 25 65 4 25 10P15 55 29 55 29 60 31 65 33 65 33 10P20 60 31 60 31 65 33 70 35 75 37 10P75 90 42 95 44 115 51 130 56 5 000 0.2 60 10 20 60 8 20 60 6 20 60 5 20 60 4 20 0.5 60 10 20 60 8 20 60 6 20 60 5 20 60 4 20 1 60 10 20 60 8 20 60 6 20 60 5 20 60 4 20 10P15 55 24 55 24 60 25 65 27 70 28 10P20 60 25 60 25 65 27 70 28 75 30 10P75 90 34 100 37 120 43 140 49 4 000 0.2 60 9 16 60 8 16 60 5 16 60 4 16 60 3 16 0.5 60 9 16 60 8 16 60 5 16 60 4 16 60 3 16 1 60 9 16 60 8 16 60 5 16 60 4 16 60 3 16 10P15 50 18 55 20 60 21 65 22 70 23 10P20 55 20 55 20 65 22 70 23 80 26 10P75 90 28 100 30 125 36 3 000 0.2 40 8 11 40 7 11 45 6 12 50 6 14 55 6 15 0.5 40 8 11 40 7 11 40 4 11 40 3 11 40 3 11 1 40 8 11 40 7 11 40 4 11 40 3 11 40 3 11 10P15 50 18 50 18 60 20 65 21 70 22 10P20 55 19 55 19 65 21 75 23 85 25 10P75 90 21 100 23 135 29 2 500 0.2 40 8 9.3 40 6 9.3 50 7 11 55 6 12 0.5 40 8 9.3 40 6 9.3 40 4 9.3 40 3 9.3 45 3 10 1 40 8 9.3 40 6 9.3 40 4 9.3 40 3 9.3 40 3 9.3 10P15 45 14 45 14 55 16 65 18 75 20 10P20 50 15 55 16 65 18 75 20 90 23 10P75 95 18 110 21 2 000 0.2 40 7 7.3 45 8 8.1 55 7 9.5 0.5 40 7 7.3 40 5 7.3 40 3 7.3 45 3 8.1 50 4 8.8 1 40 7 7.3 40 5 7.3 40 3 7.3 40 3 7.3 45 3 8.0 10P15 45 10P20 50 10P75 95 11 50 12 55 15 115 12 60 13 70 17 14 70 15 85 15 80 17 17 100 20 1 500 0.5 40 6 5.4 40 4 5.4 45 4 5.9 50 4 6.5 55 3 7.0 1 40 6 5.4 40 4 5.4 40 3 5.4 45 3 5.9 50 3 6.5 10P15 50 9.0 55 9.6 70 11 80 12 95 14 10P20 55 10P75 105 9.6 60 12 130 10 80 14 12 100 15 120 17 1 250 0.5 40 5 4.1 45 6 4.5 50 4 4.5 60 4 5.7 1 40 5 4.1 40 4 4.5 45 3 4.5 45 3 4.5 50 3 4.9 10P15 50 6.8 55 7.2 75 8.9 90 10 110 12 10P20 55 7.2 65 8.0 85 9.7 110 12 140 14 10P75 120 11 1 000 0.5 40 6 3.6 45 6 3.7 55 5 4.6 1 35 5 3.2 35 3 3.2 40 3 3.5 45 3 3.9 50 3 3.9 10P15 50 5.8 55 6.1 75 7.5 100 9.2 120 11 10P20 55 6.1 65 6.8 95 8.8 125 11 10P75 140 10 Fs = Instrument security factor Si = Internal burden (VA) -- CONTACT US ABB s.r.o. ELDS Brno Videnska 117, 619 00 Brno, Czech Republic Tel.: +420 547 152 021 +420 547 152 854 Fax: +420 547 152 626 E-mail: [email protected] www.abb.com -- NOTE We reserve the right to make technical changes or modify the contents of this document without prior notice. With regard to purchase orders, the agreed particulars shall prevail. ABB does not accept any responsibility whatsoever for potential errors or possible lack of information in this document. We reserve all rights in this document and in the subject matter and illustrations contained therein. Any reproduction, disclosure to third parties or utilization of its contents in whole or in parts - is forbidden without prior written consent of ABB. Copyright© 2020 ABB All rights reserved 1VLC000511 Rev.4, en 2020.02.06Adobe PDF Library 15.0 Adobe InDesign 15.0 (Windows)