Current Protection - Hitachi Relion 670 Series Product Manual

Line differential protection RED670
Version 2.2
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.
Multiple PMU functionality can be configured in the IED,
which can stream out same or different data at different
reporting rates or different performance (service) classes.

7. Current protection

Instantaneous phase overcurrent protection PHPIOC
The instantaneous three phase overcurrent (PHPIOC)
function has a low transient overreach and short tripping
time to allow use as a high set short-circuit protection
function.
Directional phase overcurrent protection, four steps
OC4PTOC
Directional phase overcurrent protection, four steps
(OC4PTOC) has an inverse or definite time delay for each
step.
All IEC and ANSI inverse time characteristics are available
together with an optional user defined time characteristic.
The directional function needs voltage as it is voltage
polarized with memory. The function can be set to be
directional or non-directional independently for each of the
steps.
A second harmonic blocking level can be set for the function
and can be used to block each step individually.
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Instantaneous residual overcurrent protection
EFPIOC
The Instantaneous residual overcurrent protection
(EFPIOC) has a low transient overreach and short tripping
times to allow the use for instantaneous earth-fault
protection, with the reach limited to less than the typical
eighty percent of the line at minimum source impedance.
EFPIOC is configured to measure the residual current from
the three-phase current inputs and can be configured to
measure the current from a separate current input.
Directional residual overcurrent protection, four
steps EF4PTOC
Directional residual overcurrent protection, four steps
(EF4PTOC) can be used as main protection for phase-to-
earth faults. It can also be used to provide a system back-
up, for example, in the case of the primary protection being
out of service due to communication or voltage transformer
circuit failure.
EF4PTOC has an inverse or definite time delay independent
for each step.
All IEC and ANSI time-delayed characteristics are available
together with an optional user-defined characteristic.
EF4PTOC can be set to be directional or non-directional
independently for each step.
IDir, UPol and IPol can be independently selected to be
either zero sequence or negative sequence.
A second harmonic blocking can be set individually for each
step.
Directional operation can be combined together with the
corresponding communication logic in permissive or
blocking teleprotection scheme. The current reversal and
weak-end infeed functionality are available as well.
The residual current can be calculated by summing the
three-phase currents or taking the input from the neutral CT.
EF4PTOC also provides very fast and reliable faulty phase
identification for phase selective tripping and subsequent
reclosing during earth fault.
Four step directional negative phase sequence
overcurrent protection NS4PTOC
Four step directional negative phase sequence overcurrent
protection (NS4PTOC) has an inverse or definite time delay
independent for each step separately.
All IEC and ANSI time delayed characteristics are available
together with an optional user defined characteristic.
The directional function is voltage polarized.
NS4PTOC can be set directional or non-directional
independently for each of the steps.
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