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Toroidal Current Transformers


Current transformers are used for electrical measuring instruments and / or electrical protective devices. They are very useful in high power circuits where the current is large. Current transformers are subdivided into two main categories.

MEASURING CURRENT TRANSFORMERS These transformers are used in measuring and indicating current, that is to reduce the line current to a value which is suitable for standard measuring instruments, relays etc.

PROTECTIVE CURRENT TRANSFORMERS These transformers are used for over current and undercurrent relaying for power circuit protection

TYPE : Current Transformers are normally categorized as Ring / Bar type and Wound Primary Ring / Bar type current transformer : A current transformer where primary winding is provided by 'the user. Wound primary current transformer : A current transformer having a primary winding of more than one full turn wound on core. Current Transformers are wound on Toroidal cores which virtually eliminates error due to leakage flux. Adjusting the number of secondary turns may compensate for some errors.
Electrical Specifications :
»
Type
Tape insulated Ring type and 
Epoxy Resin Potting type
»
Primary Current
50 Amp. To 3000 Amp. in ring type. 
25 Amp. To 600 Amp. in epoxy resin
»
Secondary Current
5 Amp. and 1 Amp. for ring type. 
0.2 , 0.1 and 0.05 Amp. for epoxy resin (other on request)
»
Burden
5, 10, 15 VA. for ring type.
0.25, 0.5, 1 and 2 VA. for epoxy resin type (other on request)
»
Accuracy Class
0.2, 0.5, 1.0, 5.0, 10.0
»
Frequency
50 Hz
»
Operating Temp.
- 10 deg. C to 40 deg. C.
»
Conforms to
IS 2705

Technical Specification :
RATIO IN AMP
BURDEN VA
CLASS
APPROXIMATE DIMENSION IN MM
50/5
5
5
With Omega Type Enclosure
75/5
5
5
100/5
5
1
150/5
5
1

With Omega Type Enclosure


RATIO IN AMP
BURDEN VA
CLASS
APPROXIMATE DIMENSION IN MM
Tape Wound With Clamp
 
 
 
A
B
C
200/5
5
1
50
95
35
250/5
5
1
50
95
35
300/5
10
1
50
95
35
400/5
10
1
60
105
30
500/5
15
1
60
105
30
600/5
15
1
60
105
30
800/5
15
1
85
125
30
1000/5
15
1
85
125
30
1200/5
15
1
110
145
30
1500/5
15
1
120
155
30
1600/5
15
1
120
155
30
2000/5
15
1
120
155
30
2400/5
15
1
135
170
30
2500/5
15
1
135
170
30
3000/5
15
1
135
170
30

Tape Wound With Clamp


We also manufacture non standard current transformer to meet the customers specification. Due to constant attempt to improve the design and due to change in the quality of material available, the figures given above are for general guidance only and are subject to confirmation.

The genral tolerance for dimensions +/- 3 mm