Hitachi Relion REL670 Product Manual page 40

Line distance protection REL670
Version 2.2
current transformers. The protection function performs a
simple summation of the currents of the two channels I3P1
and I3P2.
Phase preference logic PPLPHIZ
The optional phase preference logic (PPLPHIZ) is used with
the ZMQPDIS and FDPSPDIS distance protection. The
main purpose of this function is to provide a selective
tripping for cross-country faults in isolated or high
impedance-earthed networks.
Phase preference logic PPL2PHIZ
The Phase preference logic function (PPL2PHIZ) is used
with the high speed distance protection, quad and mho
characteristic (ZMFPDIS). It is intended to be used in
isolated or high impedance earthed networks where there is
a requirement to operate on only one of the faulty lines
during a cross-country fault. It can be used without
preference to restrain operation for single earth faults with a
delayed zero-sequence current release.
For cross-country faults, the logic selects either the leading
or lagging phase-earth loop for measurement. It initiates
operation on the preferred phase based on the selected
phase preference scheme. A number of different phase
preference schemes are available.
PPL2PHIZ provides an additional phase selection criteria,
namely under voltage criteria, suitable for phase selection
during cross-country faults. In radial networks, where there
is no fault current in the phase with the external fault,
current or impedance based phase selection methods
become ineffective. Hence, only voltage can be used for
phase selection. The phase selection result will be the same
for all bays on a bus since the voltage is the same, which is
an important condition for operating with phase preference.
In meshed and stronger networks, it may be difficult to find
appropriate under-voltage settings for phase selection.
Therefore an automatic phase selection logic is made
available which works in parallel with a set under-voltage
criterion in order to detect the two faulty phases even for
complex networks. If for any reason the PPL2PHIZ is
unable to detect the two faulty phases, then after a short
time delay all three phase-to-earth loops of the distance
protection will be released for operation. The final result
might be that both faulty feeders are disconnected. In other
words, protection operation is prioritized over strict
adherence to preference.
Automatic switch onto fault logic, voltage and current
based ZCVPSOF
Automatic switch onto fault logic (ZCVPSOF) is a function
that gives an instantaneous trip at closing of breaker onto a
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fault. A dead line detection check is provided to activate the
function when the line is dead.
6. Wide area measurement system
Synchrophasor report, 8 phasors
Configuration parameters for IEEE 1344 and IEC/IEEE
60255-118 (C37.118) protocol PMUCONF
The IED supports the following IEEE synchrophasor
standards:
• IEEE 1344-1995 (Both measurements and data
communication)
• IEEE Std IEC/IEEE 60255-118 (C37.118) (Both
measurements and data communication)
• IEEE Std IEC/IEEE 60255-118 (C37.118) and IEC/IEEE
60255-118 (C37.118).1a-2014 (Measurements)
• IEEE Std IEC/IEEE 60255-118 (C37.118) (Data
communication)
PMUCONF contains the PMU configuration parameters for
both IEC/IEEE 60255-118 (C37.118) and IEEE 1344
protocols. This means all the required settings and
parameters in order to establish and define a number of
TCP and/or UDP connections with one or more PDC clients
(synchrophasor client). This includes port numbers,
TCP/UDP IP addresses, and specific settings for IEC/IEEE
60255-118 (C37.118) as well as IEEE 1344 protocols.
Protocol reporting via IEEE 1344 and IEC/IEEE
60255-118 (C37.118) PMUREPORT
The phasor measurement reporting block moves the phasor
calculations into an IEC/IEEE 60255-118 (C37.118) and/or
IEEE 1344 synchrophasor frame format. The PMUREPORT
block contains parameters for PMU performance class and
reporting rate, the IDCODE and Global PMU ID, format of
the data streamed through the protocol, the type of reported
synchrophasors, as well as settings for reporting analog and
digital signals.
The message generated by the PMUREPORT function
block is set in accordance with the IEC/IEEE 60255-118
(C37.118) and/or IEEE 1344 standards.
There are settings for Phasor type (positive sequence,
negative sequence or zero sequence in case of 3-phase
phasor and L1, L2 or L3 in case of single phase phasor),
PMU's Service class (Protection or Measurement), Phasor
representation (polar or rectangular) and the data types for
phasor data, analog data and frequency data.
Synchrophasor data can be reported to up to 8 clients over
TCP and/or 6 UDP group clients for multicast or unicast
transmission of phasor data from the IED. More information
regarding synchrophasor communication structure and
TCP/UDP configuration is available in Application Manual
under section IEC/IEEE 60255-118 (C37.118) Phasor
Measurement Data Streaming Protocol Configuration.
1MRK 506 372-BEN Q
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