Siemens 7SR51 - Application and Setting Notes

Application and Setting Notes
Parameter: Element
•
Default setting: Disabled
This setting is used to allow the element to be switched on and off if it is not required. A separate setting
is provided for each element. These setting can be used to select the number of elements required.
Parameter Value Description
Disabled This element is switched out and is not available.
Enabled The element is available for use and can be parameterized.
Parameter: Dir. Control
•
Default setting: Non-Dir
This setting is used to define whether the element will operate for earth faults detected in the Forward
or Reverse direction based on the 67GS directional element decision or for any earth fault regardless of
the 67GS direction. This allows the earth fault protection to have different current and time settings for
forward, reverse and non-directional faults by using three 67GS function elements.
This parameter is not provided in devices that do not have voltage inputs or for current inputs that are
not polarized by the voltage inputs.
Parameter Value Description
Non-Dir Select this setting if the element is to operate regardless of the current direction
or presence of voltage.
Forward Select this setting if the element is to operate only in a forward direction.
Reverse Select this setting if the element is to operate only in a reverse direction.
Parameter: Setting
•
Default setting: 0.5 x I
n
(0.5 ⋅ I
rated
)
This setting defines the operating current threshold of the element. The operation timing will then be
dependent on the selected delay setting.
This setting should be set to suit the individual application.
Parameter: Delay
•
Default setting: 0 s
This time delay setting 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.
5.14.4
Protection and Automation Functions
5.14 50GS Instantaneous Sensitive Earth Fault – Measured
230 Reyrolle 7SR5, Overcurrent Protection Device, Device Manual
C53000-G7040-C014-1, Edition 11.2019