8.9.1 IdentificationGUID-420DD49A-C65B-4F04-B317-9558DCCE7A52 v1Function description IEC 61850identificationIEC 60617identificationANSI/IEEE C37.2device numberDistance protection zone, quadrilateralcharacteristic, separate settings (zone1)ZMRPDISS00346 V1 EN-US21Distance protection zone, quadrilateralcharacteristic, separate settings (zone2-5)ZMRAPDISS00346 V1 EN-US21GUID-119120A5-8600-44C6-9C85-81136DBBE280 v1Function description IEC 61850identificationIEC 60617identificationANSI/IEEE C37.2device numberDirectional impedance quadrilateral ZDRDIR Z<-> 21D8.9.2 Application IP14961-1 v2GUID-FC735AD1-D8C5-4513-87B3-7313AF09CBB3 v1Sub-transmission networks are being extended and often become more and morecomplex, consisting of a high number of multi-circuit and/or multi terminal lines ofvery different lengths. These changes in the network will normally impose morestringent demands on the fault clearing equipment in order to maintain anunchanged or increased security level of the power system.The distance protection function in the IED is designed to meet basic requirementsfor application on transmission and sub-transmission lines although it also can beused on distribution levels.8.9.2.1 System earthing GUID-AA9E698B-D0B5-45FC-ABA5-6A2CD988E16D v1The type of system earthing plays an important role when designing the protectionsystem. Some hints with respect to distance protection are highlighted below.Solid earthed networks GUID-02632014-090D-4D95-B678-6DFC7DE998A7 v1In solidly earthed systems, the transformer neutrals are connected solidly to earthwithout any impedance between the transformer neutral and earth.Section 8 1MRK 506 369-UEN BImpedance protection290 Line distance protection REL670 2.2 IECApplication manual
