Summation Current Transformer.pdf

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SES. SUMMATION CURRENT TRANSFORMER. ®. ®. SES. 08B. 17 - 00. Sum m ation C urrent T ransform er. Specifications are subject to change without prior ...
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SUMMATION CURRENT TRANSFORMER ♦ When the current in a number of feeders need not be individually metered but summated to a single meter or instrument, a summation current transformer can be used. In consumer installation where there are more than one feeder it is more economical to use summation metering and for this purpose, summation CT is required. The summation CT consists of two or more primary windings which are connected to the feeders to be summated, and a single secondary winding which feeds a current proportional to the summated primary current. A typical ratio would be 5 + 5 + 5 / 5A, which means that three primary feeders of 5 Amps are to be summated to a single 5 Amps meter. ♦ The correct meter ratio must be used for summation metering to take the sum of the feeders. ♦ As an example, if in a 2-way summation, each of the CTs are rated at 600/5A, then the meter should have a ratio of 1200/5A in order to give the true reading of both feeders.

TECHNICAL SPECIFICATIONS: Frequency…………………………… 50 / 60 Hz Secondary Current…………............ 5A or 1A Secondary Terminals………………. Heat resistance polycarbonate Dielectric Strength………………….. 3kV rms for 1 minute

DIMENSIONS:

WIRING DIAGRAM: RATIO

IP1

IP2

IP3

IS1

IS2

IS3

KN1 LINE CURRENT - TRANSFORMERS

KN2

176

152

KN3

64

N1

N2

NS

N3

IS 62

INSTRUMENT

138

Note: Normal rated secondary current are 1A or 5A. Specifications are subject to change without prior notice.

151

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08B17 - 00

SUMMATION CURRENT - TRANSFORMER