Siemens 7SA511 manual Independent Zones Z1, Z2, Z3

7SA511 Line Protection RelayChapter 5

5.10.2 Independent Zones Z1, Z2, Z3 (1300)

Address block 1300 consists of the settings required for zones Z1, Z2, and Z3, which operate independently from one another and independently of the overreach zones Z1B and Z1L. The settings include the reactance value, X, or reach, for each zone; the resistance value, R, for line and fault resistance, which can be set separately for phase-to-phase faults and for phase-to-ground faults; the measurement direction for each zone; and delay times T1 and T2 for single-phase faults and multi-phase faults for each zone. See Reference E, “Setting Calculations,” for detailed information on determining these settings.

Table 5-11 lists the protection presettings and setting options for zones Z1, Z2, and Z3. Compare these presettings to the information on the completed worksheets and determine which settings you need to change to match your operating environment. When you have changed all of the necessary settings, follow the procedure described in section 5.3.4 to save the new settings.

July 27, 1995 5-27