Vacuum Circuit Breaker (VCB) – Principle, Construction and Working
What is VCB? VCB stands for Vacuum Circuit Breaker. In vacuum circuit breakers, the vacuum is used as the arc quenching … Continue Reading
Substation
Parallel Operation of Single Phase Transformers
By parallel operation of single-phase transformers, we mean two or more transformers are connected to the same supply bus bars on … Continue Reading
Armature Reaction in Alternator
Armature reaction in alternator is the effect of armature flux on the field flux (i. e., rotor ampere-turns). Read this … Continue Reading
Power Transformer Testing Methods – Type, Routine & Special Tests
An electrical power transformer has to go through a number of transformer testing procedures for confirming its specifications and performances. … Continue Reading
Why Transformers are Rated in kVA, Not in kW?
Transformer rating is expressed in kVA, not in kW. Rating of a transformer or any other electrical machine reflects its load carrying … Continue Reading
Insulation Resistance Test (IR Test) or Megger Test
Insulation Resistance or IR Test is carried out by maintenance engineers to ensure the healthiness of the overall insulation system … Continue Reading
Effects of Voltage and Frequency Variation on Transformers
The effects of voltage and frequency variation on the transformer is discussed in this article. Usually, power transformers are not … Continue Reading
SF6 Circuit Breakers – Construction, Types and Working
In an SF6 Circuit breaker, sulphur hexafluoride gas is used as the arc quenching medium. The sulphur hexafluoride gas (SF6) is … Continue Reading
Substation Design Criteria and Studies
The most appropriate type of substation depends on such factors as voltage level, load capacity, environmental considerations, site space limitations, … Continue Reading
Circuit Breaker Ratings
The rating of circuit breaker is given according to the duties that are performed by it. For complete specifications, standard … Continue Reading