Correspondent Yue Changxi reported that from November 14th to 15th, 2019, China Electric Power Research Institute Co., Ltd. organized a DC transformer transient test series equipment test in Wuhan, and from the State Grid Zhejiang Electric Power Research Institute, State Grid Hebei Electric Power Research Institute It was successfully completed with more than ten experts and professors from all over the provinces such as Wuhan University of Technology, marking the successful development of the DC transformer transient test series equipment and solving the problem of lack of test equipment for DC transformer transient test.
Compared with the AC transmission system, the DC transmission system has higher response speed and wider bandwidth for controlling the protection signal. This puts higher requirements on the transient characteristics of the DC transformer, related national standards, and the power industry. Both the standard and the IEC standards regulate the transient characteristics and tests of DC transformers. However, due to the lack of corresponding test and testing equipment, the transient characteristics test of the DC transformer can not be carried out normally, which poses a hidden danger for the safe and stable operation of the DC transmission system.
The DC transformer transient test series equipment developed by China Electric Power Research Institute Co., Ltd., including DC current transformer step response test system, DC voltage transformer step response test system, DC current transformer broadband characteristic test system, DC voltage Transformer broadband characteristic test system. Among them, the DC current transformer step response test system can generate square wave currents with amplitudes of 300A~3000A, pulse width greater than 10ms, and rise time less than 10us, which solves the problem of lack of test and detection equipment for DC current transformer step response test; The DC voltage transformer step response test system can generate a square wave voltage with amplitudes of 5kV~200kV, pulse width greater than 10ms, and rise time less than 10us, which solves the problem of lack of test equipment for DC voltage transformer step response test; DC current Broadband test current of the transformer broadband characteristic test system, the amplitude reaches 600A, the frequency range is 50Hz~3000Hz, which solves the problem that the DC current transformer broadband frequency characteristic test lacks the test equipment; the broadband voltage test voltage of the DC voltage transformer broadband characteristic test system The amplitude reaches 10kV and the frequency range is 50Hz~3000Hz, which solves the problem that the test of the wide-frequency characteristics of the DC voltage transformer lacks the test equipment.
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