## Why CT Polarity is so very important?

First of all we will find out what is polarity and then we will see why it is so important in CT. What is Polarity ? It is the Polarity of Voltage present between High Voltage Terminal and the Low Voltage Terminal. It can also be referred as, the direction of the current flow.In the…

## Can we Open Secondary Circuit of a Live CT?

[et_pb_section fb_built=”1″ _builder_version=”3.22.3″ background_color=”rgba(255,255,255,0.76)” custom_margin=”0px|||0px” custom_padding=”0|0|0|0|false|false”][et_pb_row custom_padding=”0|0px|20.1389px|0px|false|false” custom_margin=”-36px|auto||auto||” _builder_version=”3.22.3″][et_pb_column type=”4_4″ _builder_version=”3.19″][et_pb_text _builder_version=”3.19.5″ text_font=”Lato||||||||” text_line_height=”1.3em” min_height=”71px” custom_padding=”2px|20px|20px|20px||” inline_fonts=”Arial,Georgia,Times New Roman”] No, we cannot open the Secondary Circuit of a Live CT, because it will make the CT to Explode. Here one question my arise that both CT and Power Transformer are Transformers but Open Circuiting CT…

## Current Transformer in Power System

Current Transformer, also called as CT,  is an essential equipment in the Power System, mainly in Transmission & Distribution Systems. What is Current Transformer? It is an Instrument Transformer, which replicates the Primary Current, but at much lower values, which can be measured by Relays/Meters.   It is a Step-up type Transformer and so the…

## Insulation Resistance Test for Current Transformer

Aim/Purpose of the IR Test: To ensure that, each winding of the Current Transformer, has sufficient Insulation Resistance with respect to Earth (CT Body) and between the two Secondary Cores. Principle: Insulation Resistance is the Ratio of the Applied Voltage (DC) to the total Leakage Current. Leakage current should be as small as possible ,…

## Tan Delta Testing of CT/Bushing

Detecting the incipient weaknesses in HV insulation. Predicting the remaining life expectancy of the equipment under test. To get the “Benchmark Reference Reading” of  equipment when the equipment is new, clean, dry and free from impurities. Isolation: The Test Equipment (CT/Bushing) needs to be made potential free, by removing the jumpers.Tan Delta Point is to…

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