Definite Time Over- And Undercurrent Protection 51 (Ocdt); Mode Of Operation; Features; Inputs And Outputs - ABB RELION REB500 Technical Manual
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Also See for RELION REB500:
- Operation manual (110 pages) ,
- Applications manual (108 pages) ,
- Engineering manual (98 pages)
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1MRK 505 406-UEN B
the incidence of a fault, as a consequence of incorrect switching and when CT saturation takes
place. Since the currents during power swings are sinusoidal and do not contain a DC
component, it is permissible to assume that the problem of CT saturation does not arise.
Zero-crossings resulting from the slip are in any event excluded by the current enable setting
of I
.
min
5.2
Definite time over- and undercurrent protection 51
(OCDT)
5.2.1
Mode of operation
Over- and undercurrent function for:
•
phase fault protection
•
backup protection
•
or for monitoring a current minimum
5.2.2
Features
•
Insensitive to DC component
•
Insensitive to harmonics
•
Single or three-phase measurement
•
Maximum respectively minimum value detection in the three-phase mode
•
Detection of inrush currents
5.2.3
Inputs and outputs
5.2.3.1
CT/VT inputs
•
Current
5.2.3.2
Binary inputs
•
Blocking
5.2.3.3
Binary outputs
•
Pick-up
•
Tripping
5.2.3.4
Measurements
•
Current amplitude
Bay protection functions REB500
Technical manual
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Section 5
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