Chapter 3: Transmission Flashcards
1
Q
How many grids are there and what are their owners?
A
> 1 TO in Britain + Wales
- National Grid Electric Transmission
2 in Scotland
- Scottish Hydro Electric Transmission Limited
- SP Transmission Limited
2
Q
What are grid voltages in the UK?
A
- Britain+Wales:
- 275kV - 400kV (anything under is distribution)
- Scotland:
- 132kV - 400kV
3
Q
Where does electricity enter and leave grid?
A
- Grid Entry Point (GEP)
- Grip Supply Point (GSP)
- Large customers have their own GSP
4
Q
How does the GBSO balance the grid? (3)
A
- Ancillary Equipment
- Bids/Offers (BETA)
- Wholesale trades
5
Q
What 2 publications give us information about the transmission grid future?
A
- 7 Year Statement
- forecasts future demand, generation, plans for network
- Offshore Development Information Statement (ODIS)
- aims to help long-term offshore grid dev
6
Q
What code is used when users sign up to use the network?
A
Connection Use of System Code (CUSC)
7
Q
What does the CUSC comprise of? (3)
A
- Transmission Network Use of System (TNUoS)
- covers install + maintenance costs
- 3 tarriffs:
a. location charge
b. residual charge
c. local
i. circuit
ii. substation
- Connection Charge
- Balancing System Use of System (BSUoS)
- covers network balancing costs
- paid by generators and suppliers
8
Q
Who owns the Offshore grid?
A
- Offshore Transmission Owner
- Offshore grid ownership is still being decided
9
Q
How are transmission costs calculated?
A
Using the RIIO
- this will soon become RIIO-2
10
Q
What are the 4 big future transmission issues?
A
- Growth in renewables
- Deep or shallow connection
- deep: new user pays for connection and network upgrade (requires subsidies)
- shallow: new user pays for connection and network upgrade is split across all users
- Invest then connect vs. Connect and manage
- Project TransmiT
