WHAT IS CURRENT TRANSFORMER?
The Current Transformer ( C.T. ), is a type of “instrument transformer” that is designed to produce an alternating current in its secondary winding which is proportional to the current being measured in primary. Current transformers reduce high voltage currents to a much lower value and provide a convenient way of safely monitoring the actual electrical current flowing in an AC transmission line using a standard ammeter. The principal of operation of a basic current transformer is slightly different from that of an ordinary voltage transformer.
NIPPEN current transformers comply with the highest international quality standard made according to BS 3938, IS-2705 or IEC 185. CT's are available in BPCT AND WPCT rated voltage 660V, Secondary current 5A or 1A in BPCT current range standard made according to BS 3938, IS-2705 or IEC 185. CT's are available in BPCT AND WPCT rated voltage 660V, Secondary current 5A or 1A in BPCT current range is 100A- 3000A, in WPCT below 75A, rated burden 1VA-30 VA.
Current Transformers low tension Bar Primary (Ring type tape insulated Ct are secondary coil wound on toroidal core of high permeability silicon steel)
Current transformers
can reduce or “step-down” current levels from thousands of amperes down to a standard output of a known ratio to either 5 Amps or 1 Amp for normal operation. Thus, small and accurate instruments and control devices can be used with CT’s because they are insulated away from any high-voltage power lines. There are a variety of metering applications and uses for current transformers such as with Wattmeters, power factor meters, watt-hour meters, protective relays, or as trip coils in magnetic circuit breakers, or MCB’s.
TYPES OF CURRENT TRANSFORMERS:
The current transformer is mainly classified into three types, i.e., wound current transformer, toroidal current transformer and bar-type transformers.
1.WOUND TRANSFORMER – In this transformer the primary winding is composed inside the transformer. The primary winding had a single turn and connected in series with the conductor that measured the current. The wound transformer is mainly used for measuring the current from 1 amps to 100 amps.
2. BAR-TYPE CURRENT TRANSFORMER: The bar type transformer has only secondary windings. The conductor on which the transformer is mounted will act as primary windings of the current transformers.
3.TOROIDAL CURRENT TRANSFORMER– This transformer does not contain primary windings. The line through which the current flow in the network is attached through a hole or a window of the transformers. The major advantage of this transformer is that the transformer has a symmetrical shape due to which it has a low leakage flux, thus less electromagnetic interference.
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