## 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 … Read more

## Why can a 50Hz CT work on 60Hz systems, and why can’t a 60Hz C.T. work on a 50 Hz system?

CT or PT functions on the principle of electromagnetic induction. The electrical energy is first converted into magnetic energy and again the magnetic energy is … Read more

## Current Transformer – Construction, Phasor and Errors

This article describes the current transformer – construction, Phasor, and Errors. Current transformers are widely used for measuring high currents. The Current transformer steps down … Read more

## Instrument Safety Factor of Current Transformer

The current transformer is used for measuring the current. The specifications of the measuring class CT are given below. The Instrument Safety Factor (ISF) is a … Read more

## How to Calculate Burden of CT

The burden of the current transformer is expressed in VA. The total VA burden should be considered when CT is used for measuring or protection … 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 critical from the perspective of safety … Read more

## Accuracy Class Of Current Transformer

The accuracy class of a CT refers to the permissible error limits of the CT over a specified range of conditions. It ensures that the … Read more

## How to Calculate Knee Point Voltage of Current Transformer?

What is the knee point voltage of CT? The knee point is defined as the voltage at which a 10% increase in applied voltage increases the magnetizing current by 50%. … Read more

## Why CT Secondary Shall Never Be Kept Open?

Open-circuited CT can cause serious safety concerns like fire, electrocution, and protection failure. Therefore, you must ensure that CT secondary should always be close-circuited. Let … Read more