Application And Setting Notes - Siemens 7SR51 Device Manual

Supervision Functions
6.2 60CTS CT Supervision

Application and Setting Notes

6.2.4
Parameter: Gn 60CTS-I Element
•
Default setting: Disabled
This setting is used to allow the element to be switched on and off if it is not required.
Parameter Value
Disabled
Enabled
Parameter: Gn 60CTS-I Setting
•
Default setting: 0.05 x I
The current from each phase is monitored. If 1 or 2 of the 3 input currents falls below this setting the
60CTS Delay is initiated.
If all 3 input currents fall below the setting, CT failure is not raised.
Parameter: Gn 60CTS-I Delay
•
Default setting: 10 s
This is the delay applied to the 60CTS-I alarm output. This delay is used to prevent nuisance indications
which would otherwise occur during switching operations and system faults.
Parameter: Gn 60CTS-V Element
•
Default setting: Disabled
This setting is used to allow the element to be switched on and off if it is not required.
Parameter Value
Disabled
Enabled
Parameter: Gn 60CTS-V Inps
•
Default setting: 0.1 x I
If the measured negative phase sequence current is above this threshold without corresponding NPS
voltage it could indicate that a CT failure has occurred. The 60CTS-V element will not operate unless this
threshold is exceeded.
Parameter: Gn 60CTS-V Vnps
•
Default setting: 10 V
If the negative phase sequence voltage is above this threshold this indicates a system fault and operation
of the 60CTS-V element is inhibited.
Parameter: Gn 60CTS-V Delay
•
Default setting: 10 s
This is the delay applied to the 60CTS-V alarm output. This delay is used to prevent nuisance indications
which would otherwise occur during switching operations and system faults.
376
(0.05 ⋅ I )
n rated
(0.1 ⋅ I )
n rated
Description
This element is off and is not available
The element is available for use and can be parame-
terized
Description
This element is off and is not available
The element is available for use and can be parame-
terized
Reyrolle 7SR5, Overcurrent Protection Device, Device Manual
C53000-G7040-C014-1, Edition 11.2019