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Combined with actual situation of Fengxian power Supply
Company, the neutral grounding modes of Fengxian 35 kV and 10 kV power grid are
studied in the paper. The different frequencies injected method
is used to measure the capacitive current of Fengxian 28 substations, and the
neutral grounding modes of the 28 substations are determined based on the
measured values of capacitive current.
We introduce a new L2 norm preserving heat
flow in matrix geometry. We show that this flow exists globally and preserves
the positivity property of Hermitian matrices.