The large alternating currents which can not be sensed or passed through normal ammeter, and current coils of wattmeters, energy meters can easily be measured by use of current transformers along with normal low range instruments. A transformer is a device which consists of two windings called primary and secondary. It transfers energy from one side to another with suitable … [Read more...] about Current Transformer (CT) – Construction and Working Principle
Amazed why secondary of current transformer should not be open? If it is left open it may destroy the current transformer. So it is very important that the secondary of Current Transformer should not be kept open. The reason is quite interesting. Either it should be shorted or must be connected in series with a low resistance coil such as current coils of watt meter, coil of … [Read more...] about Why Current Transformer (CT) Seconday Should not be Open ?
Current Transformers (CT’s) are instrument transformers that are used to supply a reduced value of current to meters, protective relays, and other instruments. CT’s provide isolation from the high voltage primary, permit grounding of the secondary for safety, and step-down the magnitude of the measured current to a value that can be safely handled by the … [Read more...] about Basic Types of Current Transformers
A current transformer is an instrument transformer in which the current ratio is with in the specified limit. The primary winding is connected in series with the load and carries the load current to be measured. The secondary winding is connected to the measuring instrument s or relay. Primary Winding Primary winding details of current transformer are given below,Primary … [Read more...] about Current Transformers – Windings and Rated Insulation Levels