ABB REL670 2.2 IEC, Applications Manual

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Set tSendMin = 0.1 s (0 s in parallel line applications)
Set Unblock = Off
Set
tSecurity
= 0.015 s
16.2 Phase segregated scheme communication logic for
distance protection ZC1PPSCH
SEMOD141690-1 v2
16.2.1 Identification
SEMOD141699-2 v2
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Phase segregated Scheme
communication logic for distance
protection
ZC1PPSCH - 85
16.2.2 Application
SEMOD141787-1 v1
SEMOD141790-4 v2
To achieve fast fault clearing for a fault on the part of the line not covered by the
instantaneous zone1, the stepped distance protection function can be supported
with logic that uses communication channels.
For the Phase segregated scheme communication logic for distance protection
(ZC1PPSCH) three channels in each direction, which can transmit an on/off signal
is required.
The performance and security of this function is directly related to the transmission
channels speed, and security against false or lost signals. Special communication
channels are used for this purpose. When power line carrier is used for
communication, these special channels are strongly recommended due to the
communication disturbance caused by the primary fault.
Communication speed, or minimum time delay, is always of utmost importance
because the purpose for using communication is to improve the total tripping speed
of the scheme. To avoid false signals that could cause false tripping, it is necessary
to pay attention to the security of the communication channel. At the same time, it
is important pay attention to the communication channel dependability to ensure
that proper signals are communicated during power system faults, the time during
which the protection schemes must perform their tasks flawlessly.
The logic supports the following communications schemes:
• blocking scheme
• permissive schemes (overreach and underreach)
• direct intertrip
1MRK 506 369-UEN B
Section 16
Scheme communication
Line distance protection REL670 2.2 IEC 709
Application manual