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Special Features
Most settings are self-explanatory. The special cases are described in the following.
If you want to use the setting group change function, set address 103 Grp Chge OPTION to Enabled. In this
case, you can select up to four different groups of function parameters between which you can switch quickly
and conveniently during operation. Only one setting group can be used when selecting the option Disabled.
The relay elements associated with non-directional overcurrent protection (both for phase and ground) are ac-
tivated at addresses 112 Charac. Phase and 113 Charac. Ground. The setting Disabled deactivates
overcurrent protection. With the setting Definite Time, overcurrent protection operates with a definite-time
characteristic.
The directional overcurrent protection is set at addresses 115 67/67-TOC and 116 67N/67N-TOC. Here, the
same options are available as for non-directional overcurrent protection (except for the 50-3 element).
At address 170, you can set the breaker failure protection to Enabled or Disabled. The setting option
enabled w/ 3I0> subjects the ground current and the negative sequence current to a plausibility check. With
the setting option Enabled w/o I>, only the circuit breaker auxiliary contacts are evaluated.
In address 181, you can enter how many line sections (maximum of three) are taken into account by the fault
locator.
At address 350, you define whether to use a Battery Charger to protect the power supply via an external
battery.
The flexible protection functions can be configured via parameter FLEXIBLE FUNC.. You can create up to 20
flexible functions by setting a checkmark in front of the desired function. When the checkmark of a function is
removed, all previously made settings and configurations get lost. After re-selecting the function, all settings
and configurations are in default setting. The flexible function can be configured in DIGSI at „Settings", „Addi-
tional Functions" and „Settings". Configuration is done, as usual, under „Settings" and „Configuration".
SIPROTEC, 7SC80, Manual
E50417-G1140-C486-A1, Release date 12.2011
Functions
2.1 General
25
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