Siemens Reyrolle 7SR5, Руководство пользователя

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Parameter:
Delay
•
Default setting:
0 s
This time delay should be set to suit the individual application.
Parameter:
VTS Action
•
Default setting:
Off
Voltage transformer failure can affect the directional decision and introduce an error. This setting selects
if operation of the
60VTS Voltage Transformer Supervision
element automatically affects the
operation of the element.
Parameter Value Description
Off The function element operates with no consideration
of the 60VTS element output status.
Inhibit When a VT failure is determined by the 60VTS func-
tion operation of the function element is inhibited.
Clearance of a system fault will then rely on other
elements or devices.
Non-Dir When a VT failure is determined by the 60VTS func-
tion the 50 element is switched to non-directional
operation – this does not require VT inputs. The
element will operate for overcurrent regardless of
current direction.
i i
NOTE
During a VT failure the device may assess the direction incorrectly and the element may operate for faults
in the non-operate direction or not operate for faults in the operate direction.
Parameter:
81HB2 Inhibit
•
Default setting:
No
High levels of inrush currents into reactive components such as transformers when they are switched in
can result in operation of overcurrent elements. The inrush current can be detected by the 81HBL2
element. This can be configured to inhibit the overcurrent element automatically.
Parameter Value Description
No The element is not inhibited by operation of the
81HBL2 element.
Yes The overcurrent element is inhibited by operation of
the 81HBL2 element and automatically released when
the 81HBL2 element resets.
Parameter:
79 Delayed Inhibit
•
Default setting:
No
The autoreclose scheme can be designed such that only instantaneous elements are used for the first
trip(s) of the sequence before reverting to time graded protection. This setting allows the delayed
element to be inhibited during the delayed autoreclose shots and should be left at the default setting of
Off
unless this is required.
i i
NOTE
Function elements are assigned as
Delayed Trips
in the 79 > 79PF menu.
Protection and Automation Functions
5.11 50 Instantaneous Overcurrent – Phase
208 Reyrolle 7SR5, Transformer Protection Device, Device Manual
C53000-G7040-C015-1, Edition 11.2019