2For details on the ground impedances and coupling factors, refer to chapter 6.9.1 1/2 Circuit-Breaker ConfigurationActivate this option if the fault record is based on a 1 1/2 circuit-breaker layout.When you activate this option, the signal assignment for the second current transformer (current transformer B) is shown.RM/RL, XM/XLCoupling factors for the parallel-line compensationEarth Current from NodeFrom the list box, you can carry out the parallel-line compensa-tion by selecting a network node with the ground current.Operating CurrentEnter the rated operating current in this field.FieldMeaning
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Fault Records3.10 Parameterizing fault records87SIPROTEC, SIGRA, ManualE50417-H1176-C070-B1, Edition 06.2017Figure 3-251 1/2 Circuit-Breaker Configuration✧Assign all signals for both current transformer A and current transformer B.✧Click OK. The Network configurationdialog is closed and the summation currents are assigned.The next time you open the Network configurationdialog, the assignment of the summation currents is shown.You can change the primary and secondary transformer data for the summation currents. They are only rele-vant for calculating the primary and secondary impedance for fault location.After assigning the summation currents, you cannot change the signal assignment for the current transformers.To change the signal assignment later, you can disable the option 1.5 CB Configurationand then reactivate it. The assignment of the summation currents is deleted as a result. It is possible to assign the signals for the current transformers again.The following restrictions apply to the 1.5 CB Configuration:
Fault Records3.10 Parameterizing fault records88SIPROTEC, SIGRA, ManualE50417-H1176-C070-B1, Edition 06.2017•If the option is activated, the multiple assignment of one signal within a network node is not possible.•The option is only available for the network nodes K1, K2, and K3.•If the option is activated, the simultaneous configuration of multiple network nodes is not possible.3.10.2Selecting the frequency sourceFrom the fault record data, SIGRA calculates further values such as harmonics or vector values. The network frequency is included as parameter in these calculations. The source of the network frequency is selected via the Settingsdialog. The settings made in this dialog apply to all fault records. The following can be selected as source of frequency:•the fault record with the frequency specification in the *.CFG file•the frequency calculated from the signal data by SIGRA •the frequency defined by the userIf the automatic detection methods calculate the wrong frequency, it is possible to define this frequency.•Select the menu item Options > Settings.The Settingsdialog is opened.
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