Different operating conditions of the machine may require different referenceimpedances. The first reference impedances is defined during the calibration.Up to five reference impedances can be defined for the protection function STTIPHIZ.ICT also performs a verification between the new reference impedance(s) and existingreference impedance(s), and warns the user if the resulting estimated resistancedifference could cause alarm or trip when one reference is shifted from another duringoperation.If more than one reference impedance is to be used, a logic must be configured todetect such changes in the operating conditions that requires a change of referenceimpedance. A logic can be based on the following conditions in order to select theactive reference impedance automatically:1. Generator voltage < set value and generator circuit breaker open: Referenceimpedance 12. Generator voltage > set value and generator circuit breaker open: Referenceimpedance 23. Generator voltage > set value and generator circuit breaker closed: Referenceimpedance 3For more information see separate application note 1MRG005030 Application examplefor injection based 100% Stator EF and Sensitive Rotor EF protection.MonitoringThe Monitoring tab of ICT offers the possibility to monitor several quantities duringtests as well as in normal operating condition in order to evaluate the behavior of theprotection function. It can help in the identification of the operating conditions, wherechange of reference impedance is required.AuditingIn the auditing part installation, calibration and commissioning reports are stored.7.3 Launching injection commissioning tool (ICT)GUID-7CDFB043-26E1-4169-9D2C-BE7C5C08AEAE v21. To launch the Injection commissioning tool (ICT), right-click REG670 in thePCM plant structure and select the Injection commissioning.2. In the ICT toolbar, select the 100% Stator Earth Fault function.Section 7 1MRK 502 073-UUS ACalibrating injection based 100% stator earth fault protection82 Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062Commissioning manual
