What is the difference between 0.2 and 0.2S class CT?

The metering class current transformer is used for metering the energy for revenue purposes. Therefore, the metering class current transformer must be as accurate as possible for correct metering of the energy. The metering class current transformer is used for tariff metering application. As per IEC/AS standard, the metering class current transformer is available in … Read more

Current Transformer – Construction, Phasor and Errors

We shall discuss current transformer – Construction, Phasor and Errors in this post. Current transformer are widely used for measuring the high current.The Current transformer steps down high value of current to low value which measuring instrument can read. If 2000 Amperes current to be read by a meter, it is not possible to read … Read more

What is meaning of 5P20 in current transformer?

  There are three types of current transformers which are used for various application.   1. Metering Purpose 2. Protection Purpose 3. Special Protection Purpose The particular class of CT is used for specific application. if one class of CT is used for other application the protection or measuring reliability is lost.If the metering class … Read more

How to Calculate Burden of CT

Burden of the current transformer is expressed in VA. The total VA burden should be taken into account when CT is used for measuring or protection purpose. The total resistance of the secondary circuit of CT known as a burden is the sum of resistances of CT secondary winding,connecting wires(lead resistance) and the resistance of … Read more

Current Transformer Secondary Grounding

According to the ANSI guide, the IEEE standard specifies the current transformer grounding practices. The grounding of the current transformer is very important in the perspective of safety and the correct operation of the protective relays. As per the grounding standard of the current transformer, the current transformer secondary circuit should be connected to the station ground at … Read more