input will block the complete function. BLKTR will block the trip output. Negative sequence
current is available as service value output I2.
15.8.9.3
Setting guideline
GUID-377FEADE-375F-4B2D-ADDE-D92C59BDBD41 v2
GlobalBaseSel: Selects the global base value group used by the function to define (IBase),
(
UBase) and (SBase).
I2>: Level of high negative sequence current detection given in % of IBase. This setting should
be based on fault calculations to find the negative sequence current in case of a fault at the
most remote point where the direct trip scheme shall be active. The negative sequence current
shall be calculated for different types of faults (single phase to earth, phase to phase to earth
and phase to phase short circuits) at different switching states in the network.
tI2: Time delay for trip in case of high negative sequence current detection. The trip function
can be used as stand alone short circuit protection with a long time delay. The choice of time
delay is depending on the application of the protection as well as network topology.
15.8.10
Zero sequence overcurrent protection LCZSPTOC
GUID-6F355F11-2863-4E05-A72C-FB4D6A1A6C0F v1
15.8.10.1
Identification
GUID-581BA9F0-7886-4E46-84B6-37E8B6962934 v1
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Zero sequence overcurrent
protection
LCZSPTOC
-
51N
15.8.10.2
Application
GUID-3110A739-C0B9-4C63-96EA-41BC0A1036DA v1
Zero sequence symmetrical components are present in all abnormal conditions involving earth.
They are having a considerably high value during earth faults.
Zero sequence overcurrent protection (LCZSPTOC) is a definite time stage comparator
function. The zero sequence input current from the SMAI block is connected as input to the
function through a group connection I3P in PCM600. This current is compared against the
preset value and a start signal will be set high if the input zero sequence current is more than
the preset value
3I0>. Trip signal will be set high after a time delay setting of t3I0. BLOCK input
will block the complete function. BLKTR will block the trip output. Zero sequence current is
available as service value output 3I0.
15.8.10.3
Setting guidelines
GUID-F4045B0D-39D9-46F1-B83D-0E6DD409E989 v2
GlobalBaseSel: Selects the global base value group used by the function to define (IBase),
(
UBase) and (SBase).
3I0> : Level of high zero sequence current detection given in % of IBase. This setting should be
based on fault calculations to find the zero sequence current in case of a fault at the most
remote point where the direct trip scheme shall be active. The zero sequence current shall be
calculated for different types of faults (single phase to earth and phase to phase to earth) at
different switching states in the network.
Section 15
1MRK 505 343-UEN B
Scheme communication
630
Application manual
Содержание Relion 670 series
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