identical to the way used for activating. The indication
Test 87
(no. 3190) is generated independently of the
chosen way. When deactivating the test mode via the binary inputs, a time delay of 500 ms becomes effec-
tive.
The following figures show possible variants for controlling the binary inputs. If a switch is used for the control
(
), it has to be observed that binary input
>Test 87 ON
(no. 3197) is parameterized as NO
contact and that binary input
>Test 87 OFF
(no. 3198) is parameterized as NC contact.
[logik-testmodus-ext-taster, 1, en_US]
Figure 2-18
External push-button wiring for controlling the differential protection test mode
Bu1
Push-button “Switching off the differential protection test mode”
BU2
Push-button “Switching on the differential protection test mode”
[logik-testmodus-ext-schalter, 1, en_US]
Figure 2-19
External switch wiring for controlling the differential protection test mode
S
Switch“Switching the differential protection test mode on/off”
1)
Binary input as make contact
2)
Binary input as break contact
If a test switch is to be used for changing to test mode, we recommend the following procedure:
•
Block the differential protection via a binary input.
•
Use the test switch to activate/deactivate the test mode.
•
Reset the blocking of the differential protection via the binary input.
Differential Protection Commissioning
General
In differential protection commissioning mode (commissioning mode in the following) the differential protec-
tion does not generate TRIP commands. The commissioning mode is intended to support the commissioning
of the differential protection.
You can check:
•
Transformer polarity, using the constellation measured values
•
Differential currents
•
Restraint currents
By editing parameters, the operating point of the differential protection can be changed without any risk up to
the generation of a pickup.
2.2.7.2
Functions
2.2 Phase Comparison Protection and Ground Differential Protection
66
SIPROTEC 4, 7SD80, Manual
E50417-G1100-C474-A2, Edition 02.2018
Summary of Contents for SIPROTEC 4 7SD80
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