Current transformer capable of switching transformation ratios for metering off-grid energy of wind power plants
A technology for electricity metering and wind farms, applied in the direction of voltage/current isolation, etc., can solve the problems of large measurement errors, and achieve the effects of eliminating measurement errors, accurate measurement, convenient installation and practicality
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[0034] like figure 1 and figure 2 As shown, the metering transformer of the wind farm is set at the connection end of the high-voltage busbar of the wind farm and the wire of the grid line. The metering transformer of the wind farm includes: a current transformer 3 for measurement, a current transformer 4 for protection, and an online meter With the current transformer 5, the primary side winding circuit of the switchable variable ratio current transformer of the present invention is connected in series with the above-mentioned transformer. In the actual power grid, the above-mentioned wires and transformers are all three groups. Since the three groups of equipment are all the same, this In the specific implementation manner, only a group of devices of any phase is used for illustration.
[0035] The switchable variable-ratio current transformer for off-grid electricity metering in wind farms of the present invention includes: a primary winding circuit and a secondary windin...
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