PTu1,n1u2,n2u2=xu1n2n1220kVPT1—2—()3—4—5—6—7—8—detaildetaildetaildetaildetailtan(20kV)detaildetaildetail/DL408-91()tgδ2500V6060s2500V10MΩ“+”“”“+”“a”“”“n”PT“N”“A”11PTU1U2U1/U2U1n/U2n11CT0.2nNCT1.9Um/1.7321.5Um/1.7323510mAtgδ/10kVUn20kVA-N10kVUn20kVAN10kVUm/1.732PT()()tgδtgδ1tgδ6PTUn20kVPTtgδ22kV2500VN2≤±3AA-N60sB150Hz400Hz60100/fs20s80150Hz220kVPT8110kVPT535kVPT3220kV48h110kV24h≤±334PTPTANNANNNAA