Polarization index (PI) test on Insulators
All Electric Insulations are dielectric in Nature and have a Capacitive Property. During application of Voltage across the Electrical Insulation, initially there will be a charging current After few instants, the Insulation becomes totally charged and the Capacitive Chrging Current becomes zero. Hence, it is recommended tp measure insulation resistance after 1 Minute from instant…
Transformer Insulation Explained !
What are different types of Insulations used in Transformer? There are two types of Insulations used in Transformers: 1) Oil 2) Solid Insulation What are the Functions of Transformer Oil ? Transformer Oil has mainly three Functions: 1) Insulation 2) Cooling 3) Also, there is contamination caused by Chemical Interactions with Windings and other…
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…
TNC Switch Working, Application and Connection Diagram
TNC Switch is used in the RP/CP (Remote TNC Switch) and in the Breaker (Local TNC Switch) for Tripping and Closing the Breaker Manually. What is a TNC Switch? It is a Three Position Switch, used for Closing or tripping the Breaker Manually from Control Panel/Relay Panel in the Control Room. The Three Positions are…
Circuit Breaker: 100 Interview Questions !
[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”] We have planned to give you 100 Interview Questions on Power Transformer. We will go on adding questions, till we reach 100 and may be we will add more than 100. Please click on the Red…
Power Transformer: 100 Interview Questions !
[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”] We have planned to give you 100 Interview Questions on Power Transformer. We will go on adding questions, till we reach 100 and may be we will add more than 100. Please click on the Red…
Overcurrent & Earthfault Protection – Basic Concept:
In this post we will be seeing , the Basic Concept of Overcurrent Protection, which includes, relay Characteristics, Relay Settings with Example. What is an Overcurrent Relay? EHV system is an Interconnected Network System of Circuit Element, having more than one Voltage Source. Hence the Fault current may flow to Fault point from both end…
Buchholz Relay in Transformer
Bucholz Relay provides Mechanical Protection for Transformer. What is a Buchholz Relay? What is the Working Principle of Buchholz Relay? 1.Accumulation Of Gases: Whenever a fault occurs inside the transformer, such as Arcing, Partial Discharge, Insulation failure of turns, breakdown of core or excess core heating, the fault is accompanied by production of excess heat….
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