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Current Transformers SM6 24 cubicles

Feasibility range and referenced types

Catalogue 2004 Number: C019 rev. 1 pag. 1/20

CONTENTS

CURRENT TRANSFORMER RECOMMENDATIONS FOR THE USE OF TABLES AND TECHNICALS NOTES

Page 3,4,5 and 6

PANEL TYPE CRM REFERENCED TYPES

ARJP1/N2 F ARJP2/N2 F

Page 7 Page 11

CONFIGURED TYPES

ARJP1/N1 F and ARJP1/N2 F ARJP2/N1 F, ARJP2/N2 F and ARJP2/N3 F

Page 8 and 9 Page 12 and 13

REFERENCED TYPES

ARJP1/N2 F

Page 7

CONFIGURED TYPES

ARJP1/N1 F and ARJP1/N2 F

Page 8 and 9

PANEL TYPE QMC

PANEL TYPE DMV-A, DMV-D, IMC REFERENCED TYPES

ARJP2/N2 F

Page 11

CONFIGURED TYPES

ARJP1/N1 F and ARJP1/N2 F ARJP2/N1 F, ARJP2/N2 F and ARJP2/N3 F

Page 8 and 9 Page 12 and 13

PANELS TYPE 1250A

DM1-A, DM1-D, DM1-W, DM1-Z, GBC-A, GBC-B, DMV-A, DMV-D

REFERENCED TYPES

ARJP3/N2 F

Page 15

CONFIGURED TYPES

ARJP3/N1 F, ARJP3/N2 F and ARJP3/N3 F

Page 16

PANELS TYPE DM1-A, DM1-D, DM1-W, DM2, GBC-A, GBC-B REFERENCED TYPES

ARM3/N2 F

Page 18

CONFIGURED TYPES

ARM3/N1 F and ARM3/N2 F

Page 19

NOTE:

N1, N2 and N3 MEAN THE NUMBER OF SECONDARIES F MEANS THAT THERE IS NOT BASE PLATE

pag. 2/20

CURRENT TRANSFORMERS

PREFERABLY USE the equipment selected and marked as REFERENCED

RECOMMENDATIONS FOR THE USE OF THE FEASIBILITY AND COMPUTATION SUPPORTS

_______________ ¶

CHECK NEEDS AND NECESSARY INFORMATION ACCURATELY

·

USE EQUIPMENT MARKED AS REFERENCE

¸

CHECK READLY AVAILABLE FEASIBILITY SECTIONS DIRECTLY TO APPLY KEYS TO FEASIBILITY TABLES CORRECTLY, PLEASE SEE ON PAGE 4

¹

USE ALSO ELONET TO CHECK FEASIBILITY

º

CONSULT US IF FEASIBILITY RANGE IS NOT AVAILABLE OR FOR OTHERS CHARACTERISTICS

pag. 3/20

KEYS TO THE VARIOUS TABLES TO DEFINE FEASIBILITY

1)

Define Ipn rated primary current Use primary values defined by standard (IEC): 10, 12,5, 20, 25, 30, 40, 50, 60 and 75 A and their decimal multiples.

2)

Define Ith rated short-time thermal current for 1 second Short-circuit current usually lasts 1 second. Should this value be different (equal to a lenght "t"), calculate the following:

Ith (for 1 sec.) = Ith x √t example:

3)

25 kA for 3 sec. >> 25 x √3 = 43,3 kA for 1 sec.

Calculate coefficient "K" The above reperesents the key to the various tables

Ith for 1 sec.

K= example:

4)

Ipn

Ipn = 100 A , Ith = 12,5 kA 1 sec. >> K = 12500 / 100 = 125

Finding position on the table Locate column "K" and stop on the line corresponding to a value higher than K. example:

5)

K calculate value = 125 >> ligne K = 150

Check feasibility A possible current transformer will feature the performances shown in the columns identified by boxes : For perotection secondary is true, only for choosing in the catalogue, the following formule:

VA x FL = constant example: 10VA 5P10 ( VA x FL= 10 x 10= 100 ) >> 5VA 5P20 ( VA x FL= 5 x 20= 100 )

pag. 4/20

TECHNICAL NOTES Diagrams of the terminals markings according to IEC standard.

SINGLE RATIO P1

P2

P1

S1

S2

1S1

CT with ONE SECONDARY WINDING

P2

1S2

2S1

2S2

P1

1S1

CT with TWO SECONDARY WINDINGS

P2

1S2 2S1 n da

2S2

3S1 dn

3S2

CT with THREE SECONDARY WINDINGS

F WARNING ! The secondary open winding of a CT is dangereus! The unused secondary windings of a CT must be short-circuited. pag. 5/20

Current transformer with DOUBLE RATIO through primary coulping. types ARM3 Burden values are the same for both ratios. P1

C1

C2

P2

SERIAL PRIMARY COUPLING LOW RATIO

P1

C1

C2

P2

PARALLEL PRIMARY COUPLING HIGH RATIO

Current transformer with DOUBLE RATIO through connection on secondary. types ARJP1, ARJP2, ARJP3

P1

S1

S2

P2

P1

S3

1S1

CT with ONE SECONDARY WINDING

P2

1S2

1S3 2S1

2S2

2S3

CT with TWO SECONDARY WINDINGS

S1-S2 LOW RATIO S1-S3 HIGH RATIO

1S1-1S2 2S1- 2S2 1S1-1S3 2S1- 2S3

LOW RATIO HIGH RATIO

H Burden values are different for each of the two ratios

F WARNING ! The secondary open winding of a CT is dangereus! The unused secondary windings of a CT must be short-circuited. pag. 6/20

REFERENCED CURRENT TRANSFORMERS Type ARJP1/N2 F Panel type CRM - QMC

Dimensions

Drawing n° H 103441

Characteristics

Standard reference IEC 60044-1 Rated highest voltage : 24 kV Rated continous thermal current 1,2 x In Frequency 50 and 60 Hz

CTs type ARJP1/N2F Reference number

Ratio

Short-time current I th t (kA) (s)

(A/A)

1st secondary

2nd secondary

51238639F0

10/5-5

1,2

1

15 VA cl. 0,5 Fs