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If all requirements are met, the request is accepted and the indication „Logout" OFF
(No. 3484) is generated. According to the request source, either the indication
„Logout ON/off" OFF (No. 3459) or „Logout ON/offBI" OFF (No. 3460) is
output. As soon as a requirement is not met, the device is not logged on.
Figure 2-7
Bu1
Bu2
Figure 2-7 shows the preferred variant for changing the "Log out device" mode with
the aid of two buttons. The used binary inputs are to be used as NO contacts.
2.2.2.2
Differential Protection Test Mode
General
If differential protection test mode (test mode in the following) is activated, the differ-
ential protection is blocked in the entire system. Depending on the configuration, the
overcurrent protection becomes effective as an emergency function.
In the local device all currents from the other devices are set to zero. The local device
only evaluates the locally measured currents, interprets them as differential current but
does not send them to the other devices. This enables to measure the thresholds of
the differential protection. Moreover, the test mode prevents the generation of a trans-
fer trip signal in the local device by tripping of the differential protection.
If the device was logged out of the line protection system before activating the test
mode (see "Log out device" mode), the differential protection remains effective in the
other device. The local device can now also be tested.
The test mode can be activated/deactivated as follows:
• Using the integrated keypad: Menu Control/Taggings/Set: „Test mode"
• Via binary inputs (No. 3197 „>Test Diff. ON", No. 3198 „>Test Diff.
• In DIGSI with Control/Taggings: „Diff: Test mode"
The test mode status the another device of the line protection system is indicated on
the local device by the indication „TestDiff.remote" (No. 3192).
Principle of
Below, the logic is shown in a simplified way:
function
7SD610 Manual
C53000-G1176-C145-4
2.2 Protection Data Interfaces and Protection Data Topology
Preferred external button wiring for controlling in the "Log out device" mode
Button „Log on device"
Button „Log out device"
OFF") if this was allocated
53
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