scope:

Add, after the first paragraph, the following two paragraphs:

The scope of this standard includes the electrical type and production tests of dynamic braking valves which may be used in some HVDC schemes for d.c. overvoltage limitation.

This standard can be used as a guide for testing of STATCOM valves.

Add, at the end of the last sentence of the last paragraph, the words "between the purchaser and the supplier" so that the last sentence reads as follows:

For other types of valves, the test requirements and acceptance criteria should be agreed between the purchaser and the supplier.