Summation CT

Variant in Current Transformer: Summation CT

A Summation CTs are designed to summarize several synchronous AC of equal phase relation with any angle of phase difference, They are used to add secondary currents of several main CTs in order to measure with one CT only. The output current again constitutes a standardized quantity.

The secondary circuits of the main CTs are to be connected to the corresponding marked primary terminals of the summation CTs i.e. each main CTs feeds with its secondary current a speciic portion of the primary winding of the summation CTs The number of turns of the particular sections of the primary winding must it in with ratios of the main CTs.

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Features
Technical Specifications
Dimension
Test Report

Standard Features:

Summarize several synchronous AC of equal phase relation.
Provides a much safer environment for technicians.
Used to add secondary currents of several main CTs.
Principally used for the summation of currents in the same phase belt.
Compare the relaying quantities derived from the current in the three phases of the primary circuit.
Employed for the unbalanced condition in the system and due to fault condition so that the relay operates properly.
The resulting single-phase output appears across the secondary.
Converts the three phase system into positive, negative and zero sequence components.
Designed as per IS/IES/ANSI Standards..
The summated output is according to the fault condition.

Feature	Value
Input Specifications
Current Rating	1 A to 6000 A
Class of Accuracy	1 & 0.5
Rated Burden	15 VA
Rated Primary Current Input	(2.. ...8) ×5 A
Rated Sec . Current	5A or 1 A or as required
Rated Frequency	50Hz \| 60Hz
Working Temperature Range	-25 C to +40 C
Test Voltage	3 KVeff , 50 Hz 1 min / as applicable
Insulation Class	E (max.120 C)
Outer Insulation	made of non-flammmable Plastic
Thermal Short Circuit Current ( Ith )	60 X In
Rated Continuous Thermal Current ( CTC )	1.2 In