20 TD_MRI1_06.05_GB
5.2.15 Current setting for high set element
of earth fault supervision (I
E>>
)
(Similar to chapter 5.2.5)
The pickup value of X and XR-relay type relates to % I
N
.
5.2.16 Trip delay for high set element
of earth fault supervision (t
IE>>
)
(Similar to chapter 5.2.6)
5.2.17 COS/SIN Measurement
(ER/XR-relay type)
Depending on the neutral earthing connection of the
protected system the directional element of the earth
fault relay must be preset to cos ϕ or sin ϕ measure-
ment.
By pressing <SELECT> the display shows "COS" resp.
"SIN". The desired measuring principle can be se-
lected by <+> or <-> and must be entered with pass-
word.
5.2.18 SOLI/RESI changeover
(SR-relay type)
Depending on the method of neutral-point connection
of the system to be protected, the directional element
for the earth-current circuit must be set to "SOLI" (= sol-
idly earthed) or "RESI" = (resistance earthed).
5.2.19 Circuit breaker failure protection
t
CBFP
The CB failure protection is based on supervision of
phase currents during tripping events. Only after trip-
ping this protective function becomes active. The test
criterion is whether all phase currents are dropped to
<1% x I
N
within t
CBFP
(Circuit Breaker Failure Protection -
adjustable between 0.1 - 1.6s). If not all of the phase
currents have dropped to <1%xI
N
within this time, CB
failure is detected and the related relay activated. The
CB failure protection function is deactivated again as
soon as the phase currents have dropped to <1%xI
N
within t
CBFP
5.2.20 Nominal frequency
The adapted FFT-algorithm requires the nominal fre-
quency as a parameter for correct digital sampling
and filtering of the input currents.
By pressing <SELECT> the display shows "f=50" or
"f=60". The desired nominal frequency can be ad-
justed by <+> or <-> and then stored with <ENTER>.
5.2.21 Display of the activation storage
(FLSH/NOFL)
If after an activation the existing current drops again
below the pickup value, e.g. I>, without a trip has
been initiated, LED I> signals that an activation has
occured by flashing fast. The LED keeps flashing until it
is reset again (push button <RESET>). Flashing can be
suppressed when the parameter is set to NOFL.
5.2.22 Adjustment of the slave address
Pressing push buttons <+> and <-> the slave ad-
dresscan be set in range of 1-32.
5.2.23 Setting of Baud-rate (applies for
Modbus Protocol only)
Different transmission rates (Baud rate) can be set for
data transmission via Modbus protokol.
The rate can be changed by push buttons <+> and
<-> and saved by pressing <ENTER>.
5.2.24 Setting of parity (applies for
Modbus Protocol only)
The following three parity settings are possible :
• "EVN" = even
• "ODD" = odd
• "NO" = no parity check
The setting can be changed by push buttons <+> and
<-> and saved by pressing <ENTER>.
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