| characteristic time constant of a coupling current directed perpendicularly to filaments within a strand for low frequencies
Note 1 to entry: The coupling time constant is proportional to the square of the twist pitch length and inversely proportional to resistivity of the matrix. Note 2 to entry: The coupling time constant is one of the parameters expressing the magnitude of the coupling loss, and is proportional to the coupling loss. Note 3 to entry: This entry was numbered 815-13-58 in IEC 60050-815:2015.
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