5.9.5
Parameters
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Table 90: Directional sensitive EF protection for grounded system function - parameters
Signal
Description
ParSet 4..1
Parameter for determining in which set of parameters a particular function is
active.
VoltageInp
Defines the VT input channel. All the VT input channels are available for selection.
CurrentInp
Defines the CT input channel. All the CT input channels are available for selection.
CT neutral
Side of the CTs on which the star-point is formed (current direction):
•
line
•
busbar (reversed connection)
I-Setting
Current pick-up setting
V-Setting
Reference voltage pick-up setting
Angle
Characteristic angle setting
ComMode
Kind of transfer tripping scheme:
•
permissive
•
blocking
SendMode
For what system condition a signal is transmitted in an intertripping scheme:
•
forwards measurement (only permissive scheme)
•
non-directional (only blocking scheme)
•
backwards measurement (only blocking scheme)
1 Channel
Supplementary logic needed for coordinating ground fault and distance
protections when using the same communications channel for a permissive
scheme.
•
off
•
on
Echo
Echo logic for weak infeed and open CB:
•
off Echo logic disabled
•
Weak Echo only for weak infeed
•
Bkr Echo only when CB open
•
Weak & Bkr Echo for weak infeed or CB open
t
Basic
Basic time setting
t
Wait
Time allowed for a blocking signal to be transferred and for the directional
comparison to be made.
tTransBlk
Blocking time after a reversal of fault energy direction (transient blocking).
Ext Block
I/P for an external blocking signal.
•
F: enabled
•
T: disabled
•
xx: all binary inputs (or outputs of protection functions)
Receive
PLC receive input.
•
F: no PLC receive signal
•
xx: all binary inputs (or outputs of protection functions)
Table continues on next page
1MRK 505 406-UEN B
Section 5
Bay protection functions
Bay protection functions REB500
159
Technical manual
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