 | Valid CT/VT Ratios | |
This section allows you to view the valid Current Transformer (CT) and Voltage Transformer (VT) ratios.
An automated download of these ratios can be performed by accessing https://www.elexonportal.co.uk/ctvt/xml
Please ensure that your systems only allow the use of the valid CT and VT Ratios set out in the lists below by 00:00 on the effective date shown. Valid CT Ratios
Effective from:07/08/2025 | | 10/5 | | 100/1 | | 100/5 | | 1000/1 | | 1000/5 | | 1100/5 | | 120/1 | | 120/5 | | 1200/1 | | 1200/5 | | 125/1 | | 125/5 | | 1250/1 | | 1250/5 | | 1400/5 | | 15/5 | | 150/1 | | 150/5 | | 1500/1 | | 1500/5 | | 160/5 | | 1600/1 | | 1600/5 | | 180/5 | | 20/5 | | 200/1 | | 200/5 | | 2000/1 | | 2000/5 | | 2005/5 | | 2400/1 | | 2400/5 | | 25/1 | | 25/5 | | 250/1 | | 250/5 | | 2500/1 | | 2500/5 | | 2600/5 | | 275/1 | | 30/5 | | 300/1 | | 300/5 | | 3000/1 | | 3000/5 | | 315/5 | | 3200/1 | | 3200/5 | | 350/1 | | 350/5 | | 3500/1 | | 3500/5 | | 3600/5 | | 40/2 | | 40/5 | | 400/1 | | 400/5 | | 4000/1 | | 4000/5 | | 4400/5 | | 450/1 | | 450/5 | | 4800/5 | | 50/1 | | 50/5 | | 500/1 | | 500/5 | | 5000/1 | | 5000/5 | | 5300/5 | | 5400/5 | | 60/5 | | 600/1 | | 600/5 | | 630/5 | | 6300/5 | | 6500/5 | | 700/1 | | 700/5 | | 75/5 | | 750/1 | | 750/5 | | 80/5 | | 800/1 | | 800/5 | | 900/5 | | UNKNWN |
Valid VT Ratios
Effective from:12/11/2024 | | 1000/110 | | 1100/110 | | 11000/100 | | 11000/110 | | 11100/110 | | 132000/110 | | 20000/100 | | 20000/110 | | 2200/110 | | 22000/110 | | 24400/110 | | 25000/110 | | 26400/110 | | 277/230 | | 3000/110 | | 3300/110 | | 33000/110 | | 33000/63.5 | | 5500/110 | | 6100/110 | | 6600/100 | | 6600/110 | | 66000/100 | | 66000/110 | | UNKNOWN |
Last updated: 23/07/2025 13:14:49 | 
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