Calculation of Voltage Distribution with Grading Capacitor

Grading capacitor is used in EHV circuit breakers for achieving uniform voltage distribution across the contacts of multi-break circuit breaker. Multi-break circuit breaker here means that a single breaker having more than once interrupter unit. These capacitors are connected in parallel with each of the interrupter unit. In this post, we will discuss the effect…

Power Factor Improvement Principle and Correction Methods

Low power factor is mainly due to the inductive loads. In industries, mostly inductive loads are used like induction motors, lamps etc.for various purposes. These inductive loads take lagging current and hence results in low power factor. Low power factor has many disadvantages. Therefore, power factor improvement is necessary to get rid of problems associated with low power…

Difference between Harmonics and Sub-harmonics

Harmonics in electrical system is the signal having frequency which is integral multiple of fundamental frequency. This means, if the frequency of fundamental component is 50 Hz, then the frequency of harmonics will be 2×50 (=100 Hz), 3×50 (=150 Hz) and so on. If the frequency of harmonics is even multiple of fundamental frequency then…

Double Bus Single Breaker Scheme

Double Bus Single Breaker Scheme is also known as Main cum Transfer Bus Scheme. In this scheme, two bus bars, four Isolators / Disconnect Switch, One Earth Switch and oneCircuit Breaker is used in one Bay for switching purpose. What is Bay? You will come to know this terminology latter in this article. This article outlines Double Bus…