Toroidal Current Transformers

RATIO IN AMP

APPROXIMATE DIMENSION IN MM

With Omega Type Enclosure

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.
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.
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.

	PROTECTIVE CURRENT TRANSFORMERS

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

	Wound primary current transformer A current transformer having a primary winding of more than one full turn wound on core.

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

Ref. fig 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

Ref. fig 2: Tape Wound With Clamp

The genral tolerance for dimensions +/- 3 mm

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.

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