PURPOSE:To minimize the measurement error based on the ununiformity of humidity by arranging comb-line electrodes, whose basic electrodes are directed radially, on the inside part where a dry belt is formed easily in a high humidity. CONSTITUTION:Comb-line electrodes 2 and 3 are arranged approximately homogeneously on the whole surface of a shed part of an insulator body 1. Electrodes 2 are arranged double on the inside part of the shed part. Basic electrodes 4 are directed radially, and branch electrodes branched from electrodes 4 are directed in the peripheral direction. Electrodes 3 are arranged double on the outside part of the shed part, and their basic electrodes 7 are detected in the circumferential direction, and branch electrodes 8 branched from electrodes 7 are directed radially. The electrodes 3 form approximately parallel small gaps between inside electrodes 8 and outside electrodes 8, and the inside electrodes 3 are connected to the outside electrodes 2. The error in the electrodes 2 is hardly generated because of the dry belt.
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