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Zero sequence overvoltage protection (LCZSPTOV) is a definite time stage comparator
function. The Zero sequence input voltage from the SMAI block is connected as input to the
function through a group connection U3P in PCM600. This voltage is compared against the
preset value and a start signal will be set high if the input zero sequence voltage is more than
the preset value
3U0>. Trip signal will be set high after a time delay setting of t3U0. BLOCK
input will block the complete function. BLKTR will block the trip output . Zero sequence voltage
will be available as service value output as 3U0.
15.8.8.3
Setting guidelines
GUID-9BC4E28B-85CD-4CF7-96C6-C8D9D802A1B3 v2
GlobalBaseSel: Selects the global base value group used by the function to define (IBase),
(
UBase) and (SBase).
The IED is fed from a normal voltage transformer group where the residual voltage is created
from the phase to earth voltages within the protection software or the residual voltage is fed
from a broken delta-connected VT-group. The setting of analogue inputs always gives 3U0.
Therefore set:
3
ph ph
U
UBase
-
=
EQUATION2268 V1 EN-US
(Equation 561)
3U0>: Level of high zero sequence voltage detection given in % of UBase. This setting should
be based on fault calculations to find the zero sequence voltage in case of a fault at the most
remote point where the direct trip scheme shall be active. The zero sequence voltages shall be
calculated for different types of earth faults (single phase to earth and phase to phase to earth
short circuits) at different switching states in the network.
t3U0: Time delay for trip in case of high zero sequence voltage detection. The trip function can
be used as stand alone earth fault protection with a long time delay. The choice of time delay
is depending on the application of the protection as well as network topology.
15.8.9
Negative sequence overcurrent protection LCNSPTOC
GUID-0593B07A-4F76-4F92-92E9-EB30FC836ABE v1
15.8.9.1
Identification
GUID-EDC20AC7-540D-43DE-8ABF-7A463E115950 v1
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Negative sequence overcurrent
protection
LCNSPTOC
-
46
15.8.9.2
Application
GUID-D47B89E9-2279-4057-B77D-F27CDF84F1CE v1
Negative sequence symmetrical components are present in all types of fault condition.
Negative sequence overcurrent protection (LCNSPTOC) is a definite time stage comparator
function. The negative 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 negative sequence current is greater
than the preset value
I2>. Trip signal will be set high after a time delay setting of tI2. BLOCK
1MRK 505 343-UEN B
Section 15
Scheme communication
629
Application manual
Содержание Relion 670 series
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