IEC EN 60700-1 Thyristor Valves for High Voltage Direct Current (HVDC) Power Transmission - Part 1: Electrical Test

EUROLAB, together with its state-of-the-art accredited laboratories and expert team, provides precise and fast testing services within the scope of IEC EN 60700-1 test. IEC EN 60700-1 applies to thyristor valves with metal oxide surge arresters connected directly between valve terminals for use in a line commutated converter for high voltage dc power transmission or as part of a back-to-back connection. Limited to electrical type and production tests. The tests specified in this standard are based on air-insulated valves. For other valve types, test requirements and acceptance criteria can be agreed.

Each valve design shall be subjected to the type tests specified in this standard. If the valve is obviously similar to the one previously tested, the supplier may, instead of performing a type test, submit a test report of a previous type test for consideration by the purchaser. This should be accompanied by a separate report detailing the differences in design and showing how the referenced type test met the test objectives for the proposed design.

Experience in the industry shows that even with the most careful design of valves, it is not possible to avoid the occasional random failure of components at the thyristor level during service. While these failures may be stress-related, they are considered random to the extent that the cause of failure or the relationship between failure rate and stress cannot be predicted or fit for precise quantitative definition.

Type tests subject valves or valve sections to multiple stresses within a short period of time, usually no more than several times over the life of the valve, corresponding to the worst stresses to which the equipment can be subjected.

Failure or external flashing in the common electrical equipment associated with more than one thyristor level of the valve or destructive discharge in the dielectric material forming part of the valve structure, cooling channels, light guides or other insulating parts of the pulse transmission and distribution system is not allowed.

EUROLAB assists manufacturers with IEC EN 60700-1 test compliance. Our test experts, with their professional working mission and principles, provide you, our manufacturers and suppliers, the best service and controlled testing process in our laboratories. Thanks to these services, businesses receive more effective, high-performance and quality testing services and provide safe, fast and uninterrupted service to their customers.