Siemens SIPROTEC 4 7SD80 User Manual

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
(Figure 2-19), 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

Siemens SIPROTEC 4 7SD80 Specifications

General

Brand	Siemens
Model	SIPROTEC 4 7SD80
Category	Power distribution unit
Language	English