ABB Relion 670 series, Technical Reference Manual

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Section 13 Scheme communication
About this chapter
This chapter describes the scheme communication logic that is used in distance and
ground fault protection function to obtain almost instantaneous fault clearance for
faults on the protected line. The chapter considers scheme communication logic
(ZCPSCH, 85), current reversal and weak-end in-feed logic (ZCRWPSCH, 85) for the
distance protection function and scheme communication logic for residual overcurrent
protection (ECPSCH, 85) and current reversal and weak-end in-feed logic
(ECRWPSCH, 85) for the residual overcurrent function.
Also Local acceleration logic (ZCLCPLAL) is discussed which is a function that can
generate instantaneous tripping as a result of remote end faults without any
telecommunication.
The chapter contains a short description of the design, simplified logical block
diagrams, figure of the function block, input and output signals and setting parameters.
13.1 Scheme communication logic for distance or
overcurrent protection ZCPSCH(85)
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Scheme communication logic for
distance or overcurrent protection
ZCPSCH - 85
13.1.1 Introduction
To achieve instantaneous fault clearance for all line faults, scheme communication
logic is provided. All types of communication schemes for example, permissive
underreaching, permissive overreaching, blocking, unblocking, intertrip are available.
The built-in communication module (LDCM) can be used for scheme communication
signaling when included.
1MRK505222-UUS C
Section 13
Scheme communication
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Technical reference manual