ABB REL670 2.2 IEC, Applications Manual

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should be received to release the trip signal coming from the local criterion. Both
the CR signals are validated using the channel error binary flag.
16.8.6.3 Setting guidelines
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ChMode : This parameter can be set 1 out of 2 or 2 out of 2 . The parameter gives
the conditions for operation of the transfer trip function, i.e. if only one CR signal
is required or of both CR signals are required for trip (in addition to local criteria).
If only one channel is available the parameter must be set
1 out of 2 . If parallel
channels are available 2 out of 2 gives a high degree of security but can decrease
the dependability if one channel is faulted.
tOperate : Trip time is normally set maximum 0.1 s.
16.8.7 Negative sequence overvoltage protection LCNSPTOV
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16.8.7.1 Identification
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Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Negative sequence overvoltage
protection
LCNSPTOV - 47
16.8.7.2 Application
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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.
16.8.7.3 Setting guidelines
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GlobalBaseSel : Selects the global base value group used by the function to define
IBase , UBase and SBase as applicable.
1MRK 506 369-UEN B
Section 16
Scheme communication
Line distance protection REL670 2.2 IEC 735
Application manual