BS: 762611 993 IEC: 44-111 996 SISIR.

CURRENT TRANSFORMERs

1, ASTA CERTIFICATE APPROVAL .................................... 1-2 . T a

............................................................... -, INTRODUCTInN 3

3, LIMIT -- - W O R (MEASURING C .T.) ................................ 3

4, LIMIT C - ERROR (PROTECTION C.T.) . .

WEN REQ u IREMENT .................................................. 4 .;*. ii

2TION GUIDE ........................................................... 5

TAPE RING TYPE ............................................................... 6

8 EPOXY RESIN CAST TYPE ............................................. 7-8 ( f i

9, HG SERIES CAST RESIN ENCAPSULATED TYPE .............. 8

......... 10, MSQ SERIES CAST RESIN ENCAPSULATED TYPE 9 A ,

.......... I h 'CT CERIES CAST RESIN ENCAPSULATED TYPE 9

b - - -

-$I{? (Incorporated in the year 1938) 23/24 Market Place, Rugby, CV21 3DU, Engla~

1; *,seS - OF SHORT-CIRCUIT RAT IH

URER: Dixson Industrial (5) ~ t c Ltdl ~ o . 32 h p ~o KIO ~~urtriai:: Pork 2, 103-12, Sing Industrial Ca~plex, Singapore 2056;T Tasting Certification Australia 18 Mars Road, Lane Cove, NSU 2066, Australia

DATEIS) OF TESTS: 18 A u g u ~ ~ Z . ,p4+&nu~rv 2994, ( - ... * . * ' .. .. -

The apparatus, constructed in accordance with the description, porated in this Certificate has been subjected to the aerlcts of proving tsat. in w a n - with -;:t.: +

k - w 9-e .-. 7

Brltlsh Standard 3938:1973(1982), Clause 2.5.2 , J . r - , k -- - yt . : --J

~ h e r a m i t s i n & i n t h e r m x w t i ~ ~ r ~ r n d t t m ~

&andsrd(s) a d to justify tb mthge Hdgnsd by ttw m#r

"+ ~ated Short-ti- Thermal Current : 50 kA ms for 1. Rated Dynalalc Current --, -

3fc. - . _ ., 300/5 Class 1, 5 VA; dQO/S, 1600/5, 2500/5 Class . . d

- - ,

lve CTg - - . '-..

'I&-- 500/5 Class 5P5, 30 VA; 600/5 Class 10P10, 10 VA;

.! I - "4 3OQ/5 Class 5P5, 5 VA; 400/5, 1000/5 Class 5P10, 20 Y A - - ,

I- ytx:; 7

8015, 1600/5, 2500/5 Class lOP10, 15 VF ?yd - &

Thls Certificate also ve~lfies the rated continuous thsm&l curmmks o f the ) current tranrfomrs, as detailed on Page 2, In accordance nlth Clrure 2.5.3.

. . Date . . , .. . * l r

- 1'

Certificate No ....... ? .:... : . . . . j:7

AS?A CERTIFICATION SERVICES I Lzlbsratary Ref. No. 101243AC

CERnFlCATE OF %mll44RCW? WX'fINQ

8 .

. -Tgs;~~p BY: =- %- ~ * , ~ i n ~ w d i t d i i

. . ,!Wad - . Low Cmq NSW PMd9 - MkirCia DATE@) OF T M S : -22l . - !Wemk 2-

5 - - - 8 n

~hs*app~.l\rl, ~ ~ ~ ~ ~ d g g m a m w wm tlr* -,, mci photograptis ~ ~ ~ p o r i l t e d in this ccrtif- hm knn, b ths wiar @$ afpwing W t p in aczw&mce with I

INTRODUCTION

CONSTRUCTION

PERFORMANCE

MEASURING CURRENT TRANSFORMERS

NITECH provides a comprehensive range of current transformers for measuring and protective applications. -PERFORMANCE TO BS 7626193-IEC 44-1. -STANDARD OR CUSTOMISED DESIGNS AVAILABLE

The high grade silicon steel core is annealled, then insulated with H.D. Polyethylene caps. The secondary winding is toroidally wound by high precision machinery. MR and PR SERIES CTS, the PEW coated windings are then covered with elephantite paper and double-lapped with non adhesive insulating tape,as for the FR SERIES,the construction is the same with the MR & PR series except that it is double-lapped with Fibre-Tape and than varnised. For encapsulated type, Model MSQ,NSQ, RQ&CRQ CTS, has been developed to meet the requirements of modern electrical installation, These range of current transformers is very com- pact and robust and can be used for a wide range of current measuring purposes. It is designed for the use with busbar of cable conductors. Moreover, Epoxy type current transformer are also available now.

Designated to meet the highest standards in accordance to BS 7276 and IEC44-1 NITECH CTs have performance as follows: --

Overloads :As Bs 7276 and IEC 44-1 Temperature :Ambient Range-40°C ti + 70'C Dielectric Strength :2,50OV r.m.s. For 1 min. Frequency :50/60Hz Voltage :Primary rated at 660VAC

For measuring current transformers, the secondarycurrent must be directly proportional to the primary current in the working range of 10% to 120%.Normal secondary current are 1A and 5A. MODELAVAILABLE:MR,MSQ,EMR,EPR,PR,HG,RCT,JYSAND PNSQ SERIES

1 MEASURING CURRENT TRANSFORMERS (CLASSES FROM 0.1 TO 1) 1

1 .O 3.0 1 1.5 1.0 1 1 . 0 180 1 90 1 60 1 60 1 5.4 1 2.7 1 1.8 1 1.8

50% 120%

3 ' *3% f 3% PHASE ERROR NOTAPPLICABLE FOR CLASS 3 & 5 +5% f 5%

. . I , . 0.1 Precision Testing or as a std. For testing other Cts

0.2 Precision Metering 0.5 General Tariff Metering 1 .O Non Revenue measurement lncl. Power and energy.

3.0 General industrial measurements.

5.0 Approximate measurements.

PROTECTION CURRENT TRANSFORMERS

NITECH Protection Current Transformers have been designed to comply with class 5P and 10P with Accuracy Limit Factors (ALF) 5 to 20 times. The optimum selection of Protection Current Transformers in relation to class and ALF require a close examination of the relay characteristic and circuit conditions including the relay burden pilot wire lead burden. M0DEL:AVAILABLE PR,CRQ,FR,EPRAND ENSQ-P SERIES

BURDEN REQUIREMENTS The Burden imposed on a Current Transformer consist mainly of the following:- i) The impedance of pilot wire between CT & Relaylinstruments. ii) The impedance of the relays or instructments. iii) The sum of (i) & (ii) constitute the external burden required.

GUIDE TABLE FOR The following chart shows the approximate burden imposed on the PILOT LEAD BURDEN C.T. for various size of wires at varying distances.

ORDERING INFORMATION 1. When ordering please specity:- a) Ratio: 3015A to 1000015A 2011A to 500011A b) Class: 3,1,0.5,5P,1 OP,X. c) Burden: 2.5,5,10,15,20.etc. d) For protection: P5,PIO,P15 etc.

(ALF) e) Type: MR,PR,MSQ, etc.

2. For special sizes, VA, Class & Burden provide additional informations like:-

Internal Diameter required in mm. External Diameter if there are limitations. . Secondary Current if other than 5A

SELECTION GUIDE: The design of protective systems,of which the current transformers are a vital part, can be a complex one,

and we offer here a guide only to those simpler schemes which occur frequently. Our suggested ratings for

these applications should be treated with caution as they may be subject to variation due to relay

characteristics or to other components of the scheme.

RELAY MANUFACTURER,S RECOMMENDATION SHOULD ALWAYS BE FOLLOWED I=- - - I General Typo of Rela

Inverse Definite Min.Tine relays(1.D.M.T) Overcurrent 15 1 OP 10 to15

I.D.M.T.Earth Fault Relays Unrestricted earth fault with approx. time grading.

15 1 OP 10

Unrestricted earth fault where phase fault 1.D.M.T.Earth Fault Relays stability or accurate time grading required. 15 5P 10

STANDARD PRODUCT:(TAPE RING TYPE)

The following are our PVC Taped Ring Insulation class CT. For any orders different from the following

are classified as specia1,PLEASE consult our distributor/sales engineer.

GENERAL VIEW OF THE PR & MR SERIES CT

I M R M E A S U R I N G C U R R E N T T R A N S F O R M E R

I F-K P R O T E C T I O N C U R R E N T T R A N S F O R M E R 1 0 P 1 0

I Model Ratio Burden Class OD(B) All in mm HT(C)

I PR P R O T E C T I O N C U R R E N T T R A N S F O R M E R 10P20

E P O X Y M E A S U R I N G C U R R E N T T R A N S F O R M E R

Rat lo Burden Class ID( , ) ODfB)A..m. HT(C) I I . a- 1 I I I "","- S." .- " -" "" 7"

EMR 6015A 2.5VA 1 20 80 40 EMR 10015A 2.5VA 1 34 80 40 EMR 12015A 2.5VA 1 34 80 40 EMR 15015A 2.5VA 1 34 80 40 EMR 20015A 5VA 1 42 90 30

EMR 25015A 5VA 1 42 90 30

EMR 30015A 7.5VA 1 42 90 30 EMR 40015A 7.5VA 1 65 110 30

EMR 50015A 1 OVA 1 65 110 30

EMR 60015A 15VA 1 65 110 30 EMR 80015A 1 5VA 1 75 120 30 EMR 100015A 15VA 1 85 150 40

EMR 120015A 15VA I 85 150 40 EMR I 160015A I 20VA 1 0.5 110 1 175 1 40 EMR 1 200015A I 20VA I 0.5 110 1 175 1 40

I EMR 1 225015A 1 20VA I 0.5 110 1 175 1 40 -

EMR 1 250015A 1 30VA 1 0.5 130 1 190 1 40 EMR I 300015A I 30VA I 0.5 130 1 190 1 40

EPOXY PROTECTION CURRENT TRANSFORMER lOPlO Mnrlal Rat in R ~ ~ r r l a n Class IDlAI ODfBIAII in mm HTICI

EPOXY PROTECTION CURRENT TRANSFORMER 10P;

EPR 1 10015A 1 5VA 1 5P20 I 34 150 I 120

Model Ratio Burden Class - ID(A) OD(B)AII in mm HT(C) -

EPR I 15015A I 5VA I 5P20 I 34 150 1 95

EPR I 20015A I 5VA I 5P20 I 45 160 ( 75 EPR 1 25015A 1 7.5VA I 5P20 I 45 I 160 1 75 EPR I 30015A I IOVA I 5P20 1 45 160 1 75 EPR 40015A 1 5VA 5P20 65 175 75

EPR 50015A 1 5VA 5P20 65 175 75 EPR A0015A 15VA 5P20 65 175 75

1 EPR I 80015A I 15VA I 5P20 1 75 1 180 1 75 1 EPR ( 100015A I 15VA I 5P20 I 85 190 1 80 EPR I120015A 1 15VA I 5P20 I 85 190 1 80 EPR I 160015A ( 15VA I 5P20 I 110 1 200 1 60 EPR I 200015A I 15VA I 5P20 I 110 1 200 1 60

EPR 225015A 1 5VA 5P20 110 200 60

EPR 250015A 15VA 5P20 130 210 60 EPR 300015A 15VA 5P20 130 210 60

STANDARD PRODUCT(EP0XY RESIN CAST TYPE) The following are our epoxy Resin Cast Ring CT.For any orders different from the following are classified as special, PLEASE consult our distributor I sales engineer.

- -

CAST RESIN ENCAPSULATED TYPE

Outine drawing of HG 6 2 M S to HG 140/100

Dimensions in mm

Dimension of Case Unit:M/M

I Model $c:t:;;E;A~!, Rated Burden(VA) Accuracy Class Rated Voltage Rated Frequency I

*AST RESIN ENCAPSULATED TYPE

Ratel Current(A) Busbar Hole Rated Burden ncwraoi ck Rated vM 'lM Fr ecwnw P r i m a w ~ ~ n d a w Dimension (VAI

Dimension of Case UnitaMiM

Outine drawing of MSQ Dimension in mm

Model ,~~,"~~~~~~~~' B,"4,"A::F Ratefp Accuracy Class Rated Voltage Rated Frequm

Outine drawing of RCT

Dimension in mm

Dimension of Case Unit:M/M