Table of Contents
Why do transformers have oil?
Transformer oil is used to insulate high-voltage electrical infrastructure such as transformers, capacitors, switches and circuit breakers. Transformer oils are designed to operate effectively at very high temperatures, cooling, insulating, and stopping corona discharges and arcing.
How does an Oltc work?
The OLTC changes the ratio of a transformer by add- ing or subtracting to and turns from either the pri- mary or the secondary winding. The transformer is therefore equipped with a regulating or tap winding which is connected to the OLTC.
What is the purpose of on load tap changer Oltc?
The purpose of a tap changer is to regulate the output voltage of a transformer. It does this by altering the number of turns in one winding and thereby changing the turns ratio of the transformer. There are two types of transformer tap changers: an on-load tap changer (OLTC) and a deenergised tap changer (DETC).
What should be the reason for low dielectric strength of oil in a transformer?
The dielectric strength may be drastically reduced by water supply or increased amount of foreign particles. Pure transformer oil is usually free from water and mechanical impurities and its breakdown voltage is greater than 60 KV(kilowatt).
What is an Oltc?
On-load tap changer (OLTC), also known as On-circuit tap changer (OCTC), is a tap changer in applications where a supply interruption during a tap change is unacceptable, the transformer is often fitted with a more expensive and complex on load tap changing mechanism.
What are the qualities of good transformer oil?
Synthetic transformer oil like chlorinated diphenyl has excellent properties like chemical stability, non-oxidizing, good dielectric strength, moisture repellant, reduced risk due to fire and explosion.
Is transformer oil volatile?
Transformers are dynamic systems. These compounds include some of the volatile products dissolving into the system’s mineral oil. Analysis of a mineral oil sample for volatile compounds provides an indication of whether a fault or significant degradation has occurred.