Abstract: The DC over-voltage of the offshore wind HVDC system caused by onshore AC system faults is an important safety issue facing the absorption of offshore new energy. Existing methods generally ...

Click to see a step-by-step guide. STEP 1: Draw a bar: if the whole bar was 100%, estimate where 40% from the right would be and draw a vertical line. Label the left-hand part £12 and shade it in. Now ...

STEP 1: Draw a bar and label it with the total amount - in this case £20. Roughly estimate where 75% would be and draw a vertical line. Shade the larger area in and label this with a question mark.