ABB Relion 670 Series Applications Manual page 423

1MRK 511 401-UUS F
15.3 Local acceleration logic ZCLCPSCH
15.3.1 Identification
Function description
Local acceleration logic
15.3.2 Application
The local acceleration logic (ZCLCPSCH) is used in applications where a conventional
teleprotection scheme is not available (no communication channel), but where the user still
requires fast clearance for faults on the whole line.
The logic can be controlled either by the autorecloser (zone extension) or by the loss-of-load
current (loss-of-load acceleration).
The loss-of-load acceleration gives selected overreach zone permission to operate instantaneously
after checking the loss-of-load condition. It can not operate for three-phase faults.
15.3.3 Setting guidelines
The parameters for the local acceleration logic functions are set via the local HMI or PCM600.
ZoneExtension to Enabled when the first trip from selected overreaching zone shall be
Set
instantaneous and the definitive trip after autoreclosure a normal time-delayed trip.
Set LossOfLoad to Enabled when the acceleration shall be controlled by loss-of-load in healthy
phase(s).
LoadCurr must be set below the current that will flow on the healthy phase when one or two of the
other phases are faulty and the breaker has opened at remote end. Calculate the setting according
to equation 132.
LoadCurr
EQUATION1320 V1 EN-US
where:
ILoadmin is the minimum load current on the line during normal operation conditions.
The timer
avoid unwanted release due to transient inrush current when energizing the line power
transformer. The loss-of-load function will be released after the timer
same time as the load current in all three phases are above the setting
acceleration applications there is no need for delaying the release, so set the
Bay control REC670
Application manual
×
0.5 I
Load
min
=
I
Base
tLoadOn is used to increase the security of the loss-of-load function for example to
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IEC 61850 IEC 60617
identification identification
ZCLCPSCH -
Scheme communication
ANSI/IEEE C37.2
device number
-
(Equation 132)
tLoadOn has elapsed at the
LoadCurr . In normal
tLoadOn to zero.
Section 15
SEMOD52894-1 v4
M14860-1 v4
M13821-3 v4
M13854-4 v4
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