Setting Guidelines - ABB REC670 Applications Manual

1MRK 511 401-UEN A
15.5.3
15.5.3.1
Bay control REC670 2.2 IEC
Application manual
Strong
source
A
IEC99000054 V3 EN-US
Figure 197: Initial condition for weak-end infeed

Setting guidelines

The parameters for the current reversal and weak-end infeed logic for residual
overcurrent protection function are set via the local HMI or PCM600.
Common base IED values for primary current (IBase), primary voltage (UBase)
and primary power (SBase) are set in a Global base values for settings function
GBASVAL.
GlobalBaseSel: It is used to select a GBASVAL function for reference of base
values.
Current reversal
The current reversal function is set on or off by setting the parameter CurrRev to
On or Off. Time delays shall be set for the timers tPickUpRev and tDelayRev.
tPickUpRev is chosen shorter (<80%) than the breaker opening time, but minimum
20 ms.
tDelayRev is chosen at a minimum to the sum of protection reset time and the
communication reset time. A minimum tDelayRev setting of 40 ms is
recommended.
The reset time of the directional residual overcurrent protection (EF4PTOC) is
typically 25 ms. If other type of residual overcurrent protection is used in the
remote line end, its reset time should be used.
The signal propagation time is in the range 3 – 10 ms/km for most types of
communication media. In communication networks small additional time delays
are added in multiplexers and repeaters. Theses delays are less than 1 ms per
process. It is often stated that the total propagation time is less than 5 ms.
When a signal picks-up or drops out there is a decision time to be added. This
decision time is highly dependent on the interface between communication and
protection used. In many cases an external interface (teleprotection equipment) is
used. This equipment makes a decision and gives a binary signal to the protection
device. In case of analog teleprotection equipment typical decision time is in the
range 10 – 30 ms. For digital teleprotection equipment this time is in the range 2 –
10 ms.
Scheme communication
Weak
source
B
IEC99000054-3-en.vsd
Section 15
IP15042-1 v1
M13933-4 v5
M13933-6 v5
449