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Frequency Protection 81 (Optional)
•
Monitoring of falling below (f<) and/or exceeding (f>) with 4 frequency limits and time delays that are
independently adjustable
•
Particularly insensitive to harmonics and abrupt phase angle changesbesonders unempfindlich gegen
Oberschwingungen und Phasensprünge
•
Wide frequency range (approx. 25 Hz to 70 Hz)
Automatic Reclose Function (Optional)
•
For reclosing after 3-pole open condition
•
2 reclosing attempts
•
With separate action times for each reclosing attempt, optionally without action times
•
With separate dead times
•
Optionally controlled by protection element pickup with separate dead times after 1-pole, 2-pole or 3-
pole pickup
Monitoring Functions
•
Reliability of the device is greatly increased because of self-monitoring of the internal measurement
circuits, the auxiliary power supply as well as the hardware and software
•
Monitoring of the current transformer and voltage transformer secondary circuits using summation and
symmetry check techniques
•
Monitoring of communication with statistics showing the availability of transmission telegrams
•
Check of the consistency of protection settings at both line ends: no processor system start-up with
inconsistent settings which could lead to a malfunction of the differential protection system
•
Trip circuit monitoring possible
•
Check of local and remote measured values and comparison of both
•
Broken wire supervision for the secondary CT circuits with fast phase segregated blocking of the differen-
tial protection system in order to avoid malfunction
•
Supervision of measuring voltage failure using "Fuse Failure Monitor"
Flexible Protection Functions
•
Up to 20 customizable protection functions with 3-phase or 1-phase operation
•
Any calculated or directly measured variable can theoretically be evaluated
•
Standard protection logic with a constant (i.e. definite time) characteristic curve
•
Internal and configurable pickup and dropout delay
•
Editable indication texts
User-defined Logic Functions (CFC)
•
Internal and external signals can be logically combined to realize user-defined logic functions
•
All common logic functions
•
Time delays and limit value interrogations
SIPROTEC 4, 7SD80, Manual
E50417-G1100-C474-A2, Edition 02.2018
Introduction
1.3 Characteristics
27
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