Tricky but Easy Electrical Engineering!
Arcing Horn is basically projected conductors used to protect the Insulators in High Voltage Transmission Line from damage during flashover. Over voltage on Transmission Line may occur due to various reasons like lightning strike, sudden load variation, fault etc. Due to this high voltage a flash over may take place which will shatter the Insulator. … Read more
The different types of structure that have been used for an Induction Type relay are commonly called: The Shaded Pole Structure The Watthour-Meter Structure The Induction Cup and Double Induction Loop Structures The Single Induction Loop Structure. The Shaded Pole Structure: The shaded-pole structure as shown in figure below is generally actuated by current flowing … Read more
All the relays operate in response to one or more electrical quantities either to close or to open contacts. There are really only two fundamentally different operating principles: Electromagnetic Attraction, and Electromagnetic Induction. Electromagnetic attraction relays operate by virtue of a plunger being drawn into a solenoid, or an armature being attracted to the poles … Read more
Local Breaker Back-up Protection or LBB protection is provided to ensure the healthiness Power System by isolating the faulty section in case of failure of tripping of Breaker intended for tripping on sensing fault. This protection is also called Breaker Failure Protection. Figure above shows the single line diagram of one and half breaker … Read more
Anti Pumping Relay is used in a Circuit Breaker to indicate the spring failure of TNC i.e. Trip Neutral and Close (TNC) switch. TNC switch is used to manually Open and Close the Circuit Breaker either from Local or Remote. This is called TNC switch as it has three positions namely TRIP, NEUTRAL and … Read more
Pole Discrepancy Protection is an inherent feature of Circuit Breaker which ensures that all the three poles of Circuit Breaker is tripped / closed within a predefined time period. If there is a mismatch of Breaker opening / closing time then Pole Discrepancy Protection will operate and will trip all the three poles of the … Read more
The winding is the component with the highest temperature within the transformer and it is the component which is subjected to the fastest temperature increases as the load increases. Therefore for the control of the temperature parameter within the transformer, the temperature of the winding, as well as top oil, is measured. The temperature of … Read more
Losses in the transformer are of the order of 1% of its full load kW rating. There are mainly two types of losses in a Transformer i.e. Core Loss and Ohmic Loss. Because of these losses the winding of transformer as well as Core gets heat up and we need to provide sufficient cooling to … Read more
Current Transformers are classified as Dead Tank Type and Live Tank Type CTs based on their construction. The term Dead and Live has their own meaning from the view point of potential of Secondary Windings and Core. Dead Tank itself means that the potential of the Tank of CT is at earth potential i.e. zero … Read more
Thermal Overload is widely used for Motor Protection. Basically Thermal Overload Relay is an overcurrent protection of the simplest type. The working principle of Thermal Overload Relay is quite simple but interesting. Figure below shows a typical Thermal Overload Relay. An adjustment dial located on the unit allows the ampere trip setting.A manual test button … Read more