15.8.7.1
Identification
GUID-C0F8D64B-FBCD-4115-9A5A-23B252CB7E45 v1
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Negative sequence overvoltage
protection
LCNSPTOV
-
47
15.8.7.2
Application
GUID-4FDDBF7D-801B-4C7A-AAE1-8D3ED41D950E v1
Negative sequence symmetrical components are present in all types of fault condition. In case
of three phase short circuits the negative sequence voltages and current have transient nature
and will therefore decline to zero after some periods.
Negative sequence overvoltage protection (LCNSPTOV) is a definite time stage comparator
function. The negative 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 negative sequence voltage is more
than the preset value
U2>. Trip signal will be set high after a time delay setting of tU2. There is
a BLOCK input which will block the complete function. BLKTR will block the trip output.
Negative sequence voltage is also available as service value output U2.
15.8.7.3
Setting guidelines
GUID-CB454AA3-ED5F-4D8A-9568-B6A167301B1E v2
GlobalBaseSel: Selects the global base value group used by the function to define (IBase),
(
UBase) and (SBase).
U2>: Level of high negative sequence voltage detection given in % of UBase. This setting
should be based on fault calculations to find the negative sequence voltage in case of a fault at
the most remote point where the direct trip scheme shall be active. The negative sequence
voltages 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.
tU2: Time delay for trip in case of high negative sequence voltage 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.
15.8.8
Zero sequence overvoltage protection LCZSPTOV
GUID-5179ADF5-7A85-4B95-972F-F55566B46709 v1
15.8.8.1
Identification
GUID-0D2A007F-167A-4534-A41B-22C107FEAC46 v1
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Zero sequence overvoltage
protection
LCZSPTOV
-
59N
15.8.8.2
Application
GUID-07A135B9-F60B-4469-9538-DBBEDF7BF2BD v1
Zero sequence symmetrical components are present in all abnormal conditions involving earth.
They have a considerably high value during earth faults.
Section 15
1MRK 505 343-UEN B
Scheme communication
628
Application manual
Summary of Contents for Relion 670 series
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