GROUNDING FAULT DETECTION DEVICE OF NON-GROUNDING SYSTEM LINE, AND GROUNDING PROTECTION RELAY AND GROUNDING FAULT DETECTION METHOD USING THE SAME 非接地系電路の地絡検出装置とこれを用いた地絡保護継電器及び地絡検出方法 - 特許庁
GROUNDING RESISTANCE MEASURING METHOD AND GROUNDING RESISTANCE MEASURING DEVICE IN MULTIPLE GROUNDING 多重接地における接地抵抗測定方法および接地抵抗測定装置 - 特許庁
MEASURING TOOL OF TIRE GROUNDING PART タイヤの接地部測定具 - 特許庁