Woodward
Manual MRI3-ITER GB
32
DOK-TD-MRI3 ITERE Rev.A
5.4.18 Trip delay for high set element of earth fault supervision (t
IE>>
)
(Similar to 5.4.10)
5.4.19 COS/SIN Measurement (ER - 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
or sin
measurement.
By pressing <SELECT/RESET> the display shows "COS" resp. "SIN". The desired measuring prin-
ciple can be selected by <+> or <-> and must be entered with password.
5.4.20 Block/Trip – time (only ITE-device type)
The block/trip time serves for detection of a c.b. failure protection by rear interlocking. It is activated
by setting the blocking input D8/E8 and by setting the parameter to TR_B. After the set block/trip
time has expired, the relay can be tripped if the excitation of a protective function has been applied
the delay time of which has expired and the blocking function is still active. If the parameter PR_B
is set, the individual protection stages are blocked (refer to Chapter 5.7.1).
5.4.21 Circuit breaker failure protection t
CBFP
The CB failure protection is based on supervision of phase currents during tripping events. Only af-
ter tripping 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 -
2.0 s). If not all of the phase currents have dropped to <1%xI
N
within this time, CB failure is de-
tected and the related relay activated. The CB failure protection function is deactivated again as
soon as the phase currents have dropped to <1% x I
N
within t
CBFP
5.4.22 Adjustment of the slave address
Pressing pushbuttons <+> and <-> the slave ad-dress can be set in range of 1-32.
5.4.23 Setting of Baud-rate (applies for Modbus Protocol only)
Different transmission rates (Baud rate) can be set for data transmission via Modbus Protocol.
The rate can be changed by push buttons <+> and
<-> and saved by pressing <ENTER>.
5.4.24 Setting of parity (applies for Modbus Protocol only)
The following three parity settings are possible :
"even"
=
even
"odd"
=
odd
"no"
= no parity check
The setting can be changed by push buttons <+> and <-> and saved by pressing <ENTER>.
