Protection Zcpsch(85) - ABB REC670 Applications Manual

1MRK 511 401-UUS A
Section 15
15.1
15.1.1
15.1.2
Bay control REC670 2.2 ANSI
Application manual
Scheme communication
Scheme communication logic for distance or
overcurrent protection ZCPSCH(85)
Identification
Function description
Scheme communication logic for
distance or overcurrent protection
Application
To achieve fast fault clearing for a fault on the part of the line not covered by the
instantaneous zone 1, the stepped distance protection function can be supported with
logic that uses a communication channel.
One communication channel 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 channel speed and security against false or lost signals. Communication
speed, or minimum time delay, is always of utmost importance because the purpose for
using communication is to improve the 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 to 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 schemes (blocking and delta blocking)
• permissive schemes (overreaching and underreaching)
• unblocking scheme and direct intertrip
Scheme communication
IEC 61850 IEC 60617
identification identification
ZCPSCH -
Section 15
IP15749-1 v3
M14854-1 v4
ANSI/IEEE C37.2
device number
85
IP15020-1 v1
M16866-3 v5
465