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Current Transformers

Types IK5, IM, IH

Current Transformers

Introduction

Trench is a recognized world leader in the design and manufacture of high voltage equipment for application on electric utility and high energy industrial systems. As part of Trench's product scope, the Company produces a diversified range of Instrument Transformers which are installed on 69 - 800kV electrical systems. Instrument Transformers include: Voltage (Potential) Transformers (both inductive and capacitive type), Current Transformers and Combined Instrument Transformers (voltage and current transformer in one unit). Current Transformers must convert high transmission line currents (up to 5000 A) to standardized low and easily measurable values, which will be used for metering, protection and control of the high voltage system. As such, the need for accurate and reliable current transformation is essential. This brochure will detail the features and characteristics of Types IK5, IM and IH Current Transformers. Please refer to Trench brochure E210 for additional general information concerning high voltage Instrument Transformers.

Fig. 1 Type IH-650, high accuracy current transformer

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Features

· meet all ANSI and IEC metering and protection class accuracies (other standards on request) · rated primary currents up to 3000 A · applications from 25 kV to 230 kV · quality Assurance in accordance with ISO 9001 · Hi-ACC TM,0.15% accuracy units available · highly refined and processed oil/paper insulation system · head type design of low weight and minimum oil volume · excellent seismic performance as a consequence of optimized design of flanges, porcelain and their interconnection · excellent control of internal and external insulation stresses · hermetically sealed construction using nitrile rubber gaskets · uniformly distributed secondary windings guarantee accurate transformation at both rated and high currents · essentially unaffected by stray external magnetic fields · stable accuracy over a long period of time · corrosion resistant aluminum head polyester powder coated

Fig. 2 Sectioned view of a typical IK5 current Transformer

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Construction

Standard Equipment

Trench type IK5, IM and IH Current Transformers are defined as "head type" Current Transformers. These CT's are designed and constructed with the well proven, highly reliable, oil/paper insulation system. Each porcelain housed, hermetically sealed Current Transformer is equipped with an aluminum head housing which also serves as the expansion chamber, compensating for oil volume changes by means of a dry nitrogen cushion above the oil. All Current Transformers feature a single core with dual ratio, tapped secondary winding. The Current Transformer type designations are defined as follows: · IK5- 0.3% accuracy, BO.1-1.8, standard short time current rating · IM - 0.3% accuracy, BO.1-1.8, up to 5 times higher short time current rating on selected models · IH - 0.15% accuracy, BO.1-1.8, standard short time current rating For ratio arrangements, individual customer requirements may specify: · single ratio · dual ratio by secondary tap (suffix S) · dual ratio by series-parallel of primary (suffix P) · multi-ratio by secondary tap (suffix M)

· aluminum flat pad primary terminal and ground terminal · lifting holes on base · magnetic oil level gauge · oil filling plug with nitrogen filling valve · oil drain valve · secondary terminal box with 3-1.5" (38mm) knockouts · primary bypass protector · slide link to visibly short full winding

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Catalog Numbering System

Current Transformer Selection

Series IK5

Catalog numbers are composed of two parts as shown in the example on the right. · The TYPE contains the transformer SERIES designation and the BIL (kV) rating. In this example, IK5-650. · The SUFFIX is listed in two parts PRIMARY AMPERES and RATIO ARRANGEMENTS. In this example, 202S.

Design with active elements in the dome, porcelain insulator, 0.3% accuracy class,with short-time mechanical and thermal ratings as listed on page 4. IM Same design as IK5 with increased mechanical and shorttime thermal current ratings. IH Denotes Hi-ACC TM High Accuracy 0.15% metering type. Other features same as IK5 design. BIL (kV) Basic Lightning Impulse Insulation Level. Primary Amperes Indicates highest nominal primary amperage. (Suffix No 1) For example: 50 A = 500 200 A = 201 2000 A = 202 Ratio Arrangements SDual ratio by secondary tap (Suffix No 2) BlankSingle ratio PDual ratio by series-parallel of primary MMulti-ratio by secondary tap

IK5-650-202 S

Current Transformer Selection Series BIL Catalog Number (kV)Type + Suffix (No.1+ No.2) Primary Nominal Suffix Amperes No. 1 50 100 150 200 300 400 600 800 1000 1200 1500 1600 2000 3000 50 100 150 200 300 400 600 100 150 200 300 400 600 800 1000 1200 1500 1600 2000 3000 500 101 151 201 301 401 601 801 102 122 152 162 202 302 500 101 151 201 301 401 601 101 151 201 301 401 601 801 102 122 152 162 202 302 Ratio Arrangements (Suffix No.2) S Blank M P (Dual Ratio) (Single Ratio) (Multi Ratio) (Dual Ratio) 25/50:5 50/100:5 75/150:5 100/200:5 150/300:5 200/400:5 300/600:5 400/800:5 500/1000:5 600/1200:5 750/1500:5 800/1600:5 1000/2000:5 1500/3000:5 25/50:5 50/100:5 75/150:5 100/200:5 150/300:5 200/400:5 300/600:5 50/100:5 75/150:5 100/200:5 150/300:5 200/400:5 300/600:5 400/800:5 500/1000:5 600/1200:5 750/1500:5 800/1600:5 1000/2000:5 1500/3000:5 50:5 100:5 150:5 200:5 300:5 400:5 600:5 600:5MR 800:5 1000:5 1200:5 1200:5MR 1500:5 1600:5 2000:5 2000:5MR 3000:5 3000:5MR 50:5 100:5 150:5 200:5 300:5 400:5 600:5 600:5MR 100:5 150:5 200:5 300:5 400:5 600:5 800:5 1000:5 1200:5 1500:5 1600:5 2000:5 3000:5 -

IK5

150 200 250 350 550 650 750 900 1050

IK5-150IK5-200IK5-250IK5-350IK5-550IK5-650IK5-750IK5-900IK5-1050-

(No.1) (No.1) (No.1) (No.1) (No.1) (No.1) (No.1) (No.1) (No.1)

(No.2) (No.2) (No.2) (No.2) (No.2) (No.2) (No.2) (No.2) (No.2)

Consult Factory

IM

350 550 650 750 900 1050 150 200 250 350 550 650 750 900 1050

IM-350IM-550IM-650IM-750IM-900IM-1050IH-150IH-200IH-250IH-350IH-550IH-650IH-750IH-900IH-1050-

(No.1) (No.1) (No.1) (No.1) (No.1) (No.1) (No.1) (No.1) (No.1) (No.1) (No.1) (No.1) (No.1) (No.1) (No.1)

(No.2) (No.2) (No.2) (No.2) (No.2) (No.2) (No.2) (No.2) (No.2) (No.2) (No.2) (No.2) (No.2) (No.2) (No.2)

Consult Factory

IH

Notes: Other ratios available, please consult factory. For multiple secondary windings. please consult factory.

50X100:5 75X150:5 100X200:5 150X300:5 200X400:5 300X600:5 400X800:5 500X1000:5 600X1200:5 750X1500:5 800X1600:5 1000X2000:5 1500X3000:5

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Accuracy Selection

Metering Accuracy % of Nameplate Rating Optional 100% 10% 5% 1% Not Not 0.3% 0.6% specified specified 0.3% 0.6% by ANSI by ANSI 0.15% 2) 0.15% 2) 0.15%2) 0.3%4) Relay Accuracy Relay Class C200 3 ­ ­

Series

Burden Rating Class BO.1-1.8 BO.1-1.8 BO.1-1.8

IK5 IM IH1)

1 For additional information on HI-ACC TM transformers consult factory. 2 The 0.15% parallelogram is constructed using the same principles as the 0.3% parallelogram in accordance with ANSI Standard C57.13, exept the maximum phase angle and ratio correction factors of the 0.15% parallelogram are half those of the 0.3% parallelogram. 3 Rating is based on highest ratio. Higher relay ratings are available. 4 Available on some ratios listed below (consult factory for details)

Electrical Characteristics

Series BIL Applied Creepage (kV) Withstand Distance (kV) in/mm Strike Distance in/mm 25/50:5 50/100:5 75/150:5 100/200:5 150/3005 200/400:5 300/600:5 400/800:5 500/1000:5 600/1200:5 750/1500:5 800/1600:5 1000/2000:5 1500/3000:5 25/50:5 50/100:5 75/150:5 100/200:5 150/300:5 200/400:5 300/600:5 100:5 150:5 200:5 300:5 400:5 600:5 800:5 1000:5 1200:5 1500:5 1600:5 2000:5 3000:5 Ratio Thermal Rating Factor at 30° C 2.0/1.5 2.0/1.5 2.0/1.5 2.0/1.5 2.0/1.5 2.0/1.5 2.0/1.5 2.0/1.5 2.0/1.5 2.0/1.5 2.0/1.5 2.0/1.5 2.0/1.5 2.0/1.0 2.0/2.0 2.0/2.0 2.0/2.0 2.0/2.0 2.0/2.0 2.0/2.0 2.0/2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 1.875 1.5 1.0 Mechanical Short-Time Current Thermal Current Rating Rating kA RMS Max. (1 sec.) kA RMS 4 8 12 15 24 30 60 60 60 120 120 120 120 120 21 31 49 63 63 63 63 8 12 15 24 30 30 60 60 60 120 120 120 120 3 6 10 13 20 26 39 52 60 90 90 90 90 90 21 31 49 63 63 63 63 6 10 10 20 25 25 50 50 50 90 90 90 90

IK5

150 200 250 350 550 650 750 900 1050

50 70 95 140 230 275 325 395 460

34/864 34/864 52/1321 52/1321 92/2337 112/2845 169/4293 169/4293 214/5436

13/330 13/330 24/610 24/610 40/1016 48/1219 65/1651 65/1651 84/2134

IM

350 550 650 750 900 1050

140 230 275 325 395 460

52/1321 101/2565 131/3327 169/4293 169/4293 214/5436

24/610 42/1067 54/1372 65/1651 65/1651 84/2134

IH

150 200 250 350 550 650 750 900 1050

50 70 95 140 230 275 325 395 460

34/864 34/864 52/1321 52/1321 101/2565 131/3327 169/4293 169/4293 214/5436

13/330 13/330 24/610 24/610 42/1067 54/1372 65/1651 65/1651 84/2134

For units rated C400 or C800 relay class rating consult factory Note: Consult factory for ratios not listed.

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Dimensional Table

Type Series BIL (kV) IK5-150 150

A

B 39.19 (995) 39.19 (995) 50.06 (1272) 50.06 (1272) 69.12 (1755) 77.19 (1961) 100.62 (2556) 100.62 (2556) 119.00 (3023)

C 13.40 (340) 13.40 (340) 24.21 (615) 24.21 (615) 40.27 (1023) 48.34 (1228) 65.28 (1658) 65.28 (1658) 83.65 (2125)

D 10.50 (267) 10.50 (267) 10.50 (267) 10.50 (267) 11.00 (279) 11.00 (279) 14.00 (356) 14.00 (356) 14.00 (356)

Dimensions (in./mm) 1 E F G 14.00 (356) 14.00 (356) 14.00 (356) 14.00 (356) 14.00 (356) 14.00 (356) 21.00 (533) 21.00 (533) 21.00 (533) 13.94 (354) 13.94 (354) 13.94 (354) 13.94 (354) 13.94 (354) 13.94 (354) 20.58 (523) 20.58 (523) 20.97 (533) 17.00 (432) 17.00 (432) 17.00 (432) 17.00 (432) 17.00 (432) 17.00 (432) 24.00 (610) 24.00 (610) 24.00 (610)

Creepage Weight Oil H 17.00 (432) 17.00 (432) 17.00 (432) 17.00 (432) 17.00 (432) 17.00 (432) 24.00 (610) 24.00 (610) 24.00 (610) I 23.75 (603) 23.75 (603) 23.75 (603) 23.75 (603) 28.00 (711) 28.00 (711) 31.75 (806) 31.75 (806) 31.75 (806) J 17.25 (438) 17.25 (438) 17.25 (438) 17.25 (438) 22.25 (565) 22.25 (565) 25.25 (565) 25.25 (565) 25.25 (565) K 4.50 (114) 4.50 (114) 4.50 (114) 4.50 (114) 4.50 (114) 4.50 (114) 4.50 (114) 4.50 (114) 4.50 (114)

in(mm)1 lb(kg)1 gal(l)

34 (864) 34 (864) 52 (1321) 52 (1321) 92 (2337) 112. (2885) 169 (4293) 169 (4293) 214 (5436) 295 (134) 295 (134) 335 (152) 335 (152) 600 (272) 640 (291) 1640 (745) 1640 (745) 1800 (817) 11 (42) 11 (42) 14 (53) 14 (53) 29 (110) 30 (114) 79 (299) 79 (299) 87 (329)

50.26 (1277) IK5-200 200 50.26 (1277) IK5-250 250 61.13 (1553) IK5-350 350 61.13 (1553) IK5-550 550 80.38 (2042) IK5-650 650 88.45 (2247) IK5-750 750 120.13 (3051) IK5-900 900 120.13 (3051) IK5-1050 1050 138.50 (3518)

1 Weights and dimensions are approximations only and are not intended for construction purposes. Note: Dimensions for Series IH and IM differ from that listed for the IK5. Please contact factory for specific details.

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Trench Facilities

Trench® Austria GmbH Paschinger Strasse 49 Postfach 13 A-4060 Linz-Leonding Austria Phone: 43-732-6793-0 Fax: 43-732-671341 Trench® Brasil Ltda Via Expressa de Contagem, 2685 Contagem, Minas Gerais CEP 32370-485 Brazil Phone: 55-31-3391-5959 Fax: 55-31-3391-1828 Trench® China MWB (Shanghai) Co., Ltd. No. 3658, Jiancheng Road Minhang, Shanghai Peoples Republic of China 200245 Phone: 86-21-54720088 Fax: 86-21-54723118 Trench® High Voltage Products Ltd., Shenyang No. 2 Zhengliang Er. Road Jing Shen Xi San Street Dao Yi Economic Development Zone Shenyang 110136 P.R. China Phone: 86-24-89722688 Fax: 86-24-89737200 Trench® Limited Bushing Division 432 Monarch Avenue Ajax, Ontario Canada L1S 2G7 Phone: 905-426-2665 Fax: 905-426-2671 Trench® Limited Coil Product Division 71 Maybrook Drive Scarborough, Ontario Canada M1V 4B6 Phone: 416-298-8108 Fax: 416-298-2209 Trench® Limited Instrument Transformer Division 390 Midwest Road Scarborough, Ontario Canada M1P 3B5 Phone: 416-751-8570 Fax: 416-751-6952 Trench® Limited Power Line Carrier Division 815 Middlefield Road, Unit 6A Scarborough, Ontario Canada M1V 2P9 Phone: 416-291-8544 Fax: 416-291-5581 Trench® France S.A. 16, Rue du Général Cassagnou B.P. 70 F-68 302 St. Louis, Cedex France Phone: 33-3 89-70-2323 Fax: 33-3 89-67-2663 Trench® Germany GmbH Nürnberger Strasse 199 D-96050 Bamberg Germany Phone: 49-951-1803-0 Fax: 49-951-1803-224 Trench® Switzerland AG Lehenmattstrasse 353 CH-4028 Basel Switzerland Phone: 41-61-315-51-11 Fax: 41-61-315-59-00 Trench® (UK) Limited South Drive Hebburn Tyne & Wear NE 31 1 UW Phone: 44-191-483-4711 Fax: 44-191-430-0633

The Trench Group is your partner of choice for electrical power transmission and distribution solutions today; and for the development of your new technology solutions of tomorrow.

www.trenchgroup.com

E 217.31 Subject to change without notice (05.2006) Printed in Canada.

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