BS 61975:2010 pdf download – High-voltage direct current (HVDC) installations — System tests 4.4 Logical steps of system test To ensure proper functioning, the type test and functional performance test should be conducted in factory in order to debug and test the control system before the site test. In order to provide the power grid data and help to compile the system test plan, the off-line digital simulation should be conducted before and during the simulation test, especially analysis on the power flow, stability and overvoltage. Considering the complexity of the HVDC system, all limiting design cases may be conducted on the digital simulator in a similar way to those done on site. Commissioning an HVDC system may affect more than the actual contract parties. The complexity and the diversified areas concerned during system test require thorough planning and scheduling, cooperation of all involved parties and complete and structured documentation. Before a system test can begin on site, the following preconditions should be fulfilled concerning subsystem tests, operator training and safety instructions, system test plan and test procedures, and all necessary test equipment. a) All subsystems should have been tested and commissioned, including a.c. filters and the converter transformers with special attention to possible transformer or a.c. filter resonance during energizing. b) Operating personnel should be sufficiently trained. c) Operating instructions for the station should be available. d) Personnel, plant safety and security instructions should be available. e) System test plan and documentation (Part 8) should be available and agreed upon. f) AC/d.c. power profiles should have been agreed for each test. g) Any a.c./d.c. system operating restrictions should have been identified. h) Operator voice communications should be available i) All necessary test equipment should have been calibrated and in service. j) Procedures for the preparation and evaluation of test results should have been agreed upon. Site system tests should follow the structure of the HVDC system, starting from the smallest, least complex operational unit, usually a 1 2-pulse converter, and shall end with the total system in operation. The test sequence should be scheduled starting at the local level with simple tests before involving additional locations and the transmission system and more complex tests. After all preconditions are fulfilled, converter station tests should be conducted and begin from the converter unit test, including energizing of a.c. filter and d.c. yard, electrical magnetic interference， trip test, changing the d.c. system...
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