Current Transformers
for
Medium Voltage
type AB
Edition 11.04
INFORMATION FOR THE CURRENT TRANSFORMERS
Operation Conditions for Current Transformers
1- When the secondary terminals are connected to the measuring or protection
equipments, one of the terminals should be earthed for safety, (see FIGURE CT-1)
2-The secondary circuit of a current transformer must not be operated
with an open-circuit,
3-The secondary winding of a current transformer which will not be connected
must be short- circuited and earthed. (see FIGURE CT-3)
4-For the transformer with reconnectable and/or tapped secondaries, un-used
terminals must be left open(see FIGURE CT-4)
5-The current transformers which have capacitive divider tap (Ck) must be connected
to indicator, if not used then must be earthed
FIGURE CT-1
ALCE 2004 - 11
FIGURE CT-4
FIGURE CT-3
Support type indoor current transformers
AB12, AB12-2, AB12-3
Technical Descriptions
Indoor current transformer
Type AB12
narrow type, cast resin
Dimensions acc. to DIN 42600 part 8 *
Up to 3 cores
On request with capacitive layer
On request with barrier
Technical Data
Type
AB12
AB12-2
AB12-3
Operating voltage (maximum)
7.2 kV
12 kV (17.5 kV)
Rated power-frequency withstand voltage (1 minute)
20 kV
28 kV (38 kV)
Rated Impulse test voltage (1,2/50 s) full wave
60 kV
75 kV (95 kV)
Rated frequency
50 Hz, 60 Hz
Primary rated current
10 - 2500 A
Primary reconnection
2x10 A - 2x600 A
Secondary rated current
1A, 5A
Rated short-time thermal current Ith (1s)
max. 60 kA (max. 1000 x In)
Rated dynamic current Idyn
2.5 x Ith, max. 120 kA
Short-time load (mechanical)
5000 N
E
Insulation class
-5 .......... +40 C
Ambient temperature
1000 m
Altitude
IEC, VDE 0414 Teil 44-1 2003-12, ANSI
Standard
20-24 kg
Weight (approx.)
* Lenght deviating for modifications AB12-2, AB12-3
ALCE 2004 - 11
- 01 -
28-32 kg
33-36 kg
Support type indoor current transformers
AB12
Dimensions
Acc. to DIN 42600, (Part 8)
Secondary terminal on P1 side (on request ,on P2 side)
with barrier
Primary connection bars
In 2x600A
In < 1500A
Tested terminal zones :
1500A In 2500A
(*) On request 40mm (without barrier)
(**) On request 40mm (without barrier)
or 24mm.
Legend
-02 -
Starting torque
Primary terminal
M12
60 - 70 Nm
Ground terminal
M8
16 - 20 Nm
Secondary terminal M5
2 - 2.5 Nm
ALCE 2004 - 11
Support type indoor current transformers
AB12-2
Dimensions
Secondary terminal on P1 side (on request, on P2 side)
with barrier
Primary connection bars
(*)
In 2x600A
(*)
In < 1500A
Tested terminal zones :
(**)
1500A In 2500A
(*) On request 40mm (without barrier)
(**) On request 40mm (without barrier) or 24mm.
Legend
ALCE 2004 - 11
- 03 -
Starting torque
Primary terminal
M12
60 - 70 Nm
Ground terminal
M8
16 - 20 Nm
Secondary terminal M5
2 - 2.5 Nm
Support type indoor current transformers
AB12-3
Dimensions
Secondary terminal on P1 side (on request, on P2 side)
with barrier
Primary connection bars
In 2x600A
In < 1500A
Tested terminal zones :
1500A In 2500A
(*) On request 40mm (without barrier)
(**) On request 40mm (without barrier) or 24mm.
Legend
- 04 -
Starting torque
Primary terminal
M12
60 - 70 Nm
Ground terminal
M8
16 - 20 Nm
Secondary terminal M5
2 - 2.5 Nm
ALCE 2004 - 11
Support type indoor current transformers
AB24, AB24-2, AB24-3
Technical Descriptions
Indoor current transformer
Type AB24
narrow type, cast resin
Dimensions acc. to DIN 42600 part 8 *
Up to 3 cores
On request with capacitive layer
On request with barrier
Technical Data
Type
AB24
AB24-2
Operating voltage (maximum)
24 kV
Rated power-frequency withstand voltage (1 minute)
50 kV
Rated Impulse test voltage (1,2/50 s) full wave
125 kV
Rated frequency
50 Hz, 60 Hz
Primary rated current
10 - 2500 A
Primary reconnection
2x10 A - 2x600 A
Secondary rated current
1A, 5A
Rated short-time thermal current Ith (1s)
max. 60 kA (max. 1000 x In)
Rated dynamic current Idyn
2.5 x Ith, max. 120 kA
Short-time load (mechanical)
5000 N
E
Insulation class
-5 .......... +40 C
Ambient temperature
1000 m
Altitude
IEC, VDE 0414 Teil 44-1 2003-12, ANSI
Standard
30-36 kg
Weight (approx.)
* Lenght deviating for modifications AB24-2, AB24-3
ALCE 2004 - 11
AB24-3
- 05 -
36-42 kg
46-52 kg
Support type indoor current transformers
AB24
Dimensions
Acc. to DIN 42600 (Part 8)
Secondary terminal on P1 side (on request, on P2 side)
with barrier
Primary connection bars
In 2x600A
In < 1500A
Tested terminal zones :
1500A In 2500A
(*) On request 40mm (without barrier)
(**) On request 40mm (without barrier)
or 24mm.
Legend
- 06 -
Starting torque
Primary terminal
M12
60 - 70 Nm
Ground terminal
M8
16 - 20 Nm
Secondary terminal M5
2 - 2.5 Nm
ALCE 2004 - 11
Support type indoor current transformers
AB24-2
Dimensions
Secondary terminal on P1 side (on request, on P2 side)
with barrier
Primary connection bars
(*)
In 2x600A
(*)
In < 1500A
(**)
Tested terminal zones :
1500A In 2500A
(*) On request 40mm (without barrier)
(**) On request 40mm (without barrier)
or 24mm.
Legend
ALCE 2004 - 11
- 07 -
Starting torque
Primary terminal
M12
60 - 70 Nm
Ground terminal
M8
16 - 20 Nm
Secondary terminal M5
2 - 2.5 Nm
Support type indoor current transformers
AB24-3
Dimensions
Secondary terminal on P1 side (on request, on P2 side)
with barrier
Primary connection bars
In 2x600A
In < 1500A
Tested terminal zones :
1500A In 2500A
(*) On request 40mm (without barrier)
(**) On request 40mm (without barrier)
or 24mm.
Legend
- 08 -
Starting torque
Primary terminal
M12
60 - 70 Nm
Ground terminal
M8
16 - 20 Nm
Secondary terminal M5
2 - 2.5 Nm
ALCE 2004 - 11
Support type indoor current transformers
AB36
Technical Descriptions
Indoor current transformer
Type AB36
big type, cast resin
Up to 3 cores
On request with capacitive layer
On request with barrier
Technical Data
Type
AB36
Operating voltage (maximum)
36 kV
Rated power-frequency withstand voltage (1 minute)
70 kV
Rated Impulse test voltage (1,2/50 s) full wave
170 kV
Rated frequency
50 Hz, 60 Hz
Primary rated current
10 - 2500 A
Primary reconnection
2x10 A - 2x600 A
Secondary rated current
1A, 5A
Rated short-time thermal current Ith (1s)
max. 60 kA (max. 1000 x In)
Rated dynamic current Idyn
2.5 x Ith, max. 120 kA
Short-time load (mechanical)
5000 N
E
Insulation class
-5 .......... +40 C
Ambient temperature
1000 m
Altitude
IEC, VDE 0414 Teil 44-1 2003-12, ANSI
Standard
40-50 kg
Weight (approx.)
ALCE 2004 - 11
- 09 -
Support type indoor current transformers
AB36
Dimensions
Tolerances acc. to IT - 14
Secondary terminal on P1 side (on request, on P2 side)
Primary connection bars
In 2x600A
In < 1500A
Tested terminal zones :
1500A In 2500A
Type
H
mm
A
mm
B
mm
L
mm
L1
mm
AB36-1
360
260
220
355
15
AB36-2
360
280
225
355
15
AB36-3
360
320
240
380
22
AB36-S1
330
260
220
355
15
AB36-S2
330
280
225
355
15
AB36-S3
330
320
240
380
22
AB36-T1
390
260
220
355
15
AB36-T2
390
280
AB36-T3
390
320
225
355
15
240
380
22
- 10 -
(*) On request 40mm
(**) On request 40mm or 24mm.
Legend
Primary terminal
Starting torque
M12
60 - 70 Nm
Ground terminal
M8
16 - 20 Nm
Secondary terminal
M5
2 - 2.5 Nm
ALCE 2004 - 11
