Signals - ABB RELION REX640 Technical Manual

1MRS759142 C
6.4.6
REX640
Technical Manual
The figure shows that in the time synchronization the transmission time to send a
message from station B to station A, T1→T2, and the time to receive a message from
A to B, T4→T5, are measured. The station A protection relay delay from the sampling
to the start of send, T3→T4, and the local delay from receive to the station B protection
relay sampling T5→T6 time, are also measured for the station B protection relay, and
vice versa. This way the time alignment factor for the local and remote samples is
achieved.
GUID-7B15EC43-A38D-4F8F-9A84-07BFDA4F31EF V1 EN
Figure 667: Measuring sampling latency
T T T T
( ) ( )
− + −
2 1 5 4
P
=
d
2
GUID-F89915ED-F466-4242-ADE6-868BA28ACCFC V1 EN
S P ( T T ) ( T
= + − + −
d d 4 3 6
GUID-2C2EC74E-102F-452D-9FAE-76C9F560ADAB V1 EN
The sampling latency S
d
assumes that the one-way propagation delay P
The echo method without GPS can be used in telecommunication transmission
networks as long as delay symmetry exists, that is, the sending and receiving delays
are equal.

Signals

Table 1153: PCSITPC Output signals
Name Type
OK BOOLEAN
WARNING BOOLEAN
ALARM BOOLEAN
COMM BOOLEAN
T )
5
is calculated for each telegram on both ends. The algorithm
is equal for both directions.
d
Description
Protection communication ok
Protection communication warning
Protection communication alarm
Communication detected, active when data is
received
Section 6
Supervision functions
(Equation 282)
(Equation 283)
1225