Ac and disruptions Flashcards
What is ac?
Alternating current
What is dc?
Direct current
What is the difference between alternating current and direct current?
The reason is because alternating current always reverses its direction, whilst direct current goes in a straight line
Why is ac(alternating current) used more in electrical supply around Britain?
The main reason ac is used for electrical supply networks is because 1. A.c. can be easily transformed from one voltage to another and 2. A.c. produces less arcing and sparking on contacts, etc.
What is the normal disturbed voltage for consumers?
230v(single phase)
What is the generator voltage in the uk?
25kv
What is the grid system transmissions in the uk?
400kv or 275kv
How do you go from 25kv for a generator to 400kv/275kv for a grid system?
Using a step-up transformer.
What are the common distributions in the uk?
132kV, 66kV, 33kV, 11kV, (6.6kV and 3.3kV) 400/230V.
How can you go from 400kv/275kv power station to 132kv and lower?
Step down transformer.
What do we call when you step down a 400kv/275kv power station to 132kv/66kv?
Secondary distribution
What do we call when we step down a 132kv/66kv secondary distribution to 33kv/11kv?
Local distribution
What do we call when we step down a 33kv/11kv local distribution to 400v?
Commercial and industrial use
What do we call when we step down a 33kv/11kv local distribution to 230v?
Domestic use
What device is used transform? And what current alternating or direct do we use?
Transformer and this will only work on alternating current, NOT direct current.
