Wide Area Measurement System - ABB Relion 670 Series Product Manual

Generator protection REG670
Version 2.2
To implement the above concept, a separate injection
box is required. The injection box generates a square
wave voltage signal which for example can be fed into
the secondary winding of the generator neutral point
voltage transformer or grounding transformer. This
signal propagates through this transformer into the
stator circuit.
The magnitude of the injected voltage signal is
measured on the secondary side of the neutral point
voltage transformer or grounding transformer. In
addition, the resulting injected current is measured
through a resistive shunt located within the injection
box. These two measured values are fed to the IED.
Based on these two measured quantities, the IED
determines the stator winding resistance to ground. The
resistance value is then compared with the preset fault
resistance alarm and trip levels.
When the synchronous machine is at standstill, the
protection function can not only detect the earth fault
at the generator star point, but also along the stator
windings and at the generator terminals, including the
connected components such as voltage transformers,
circuit breakers, excitation transformer and so on. The
protection function is fully operative in all operating
conditions when stable measurements are achieved.
Both function STTIPHIZ and ROV2PTOV shall be
configured and shall operate in parallel in the same
REG670 in order to perform the 100% stator earth-fault
protection function. The function STTIPHIZ performs the
earth-fault protection based on the injection principle in
order to protect the section of the stator windings close
to the generator neutral point; the function ROV2PTOV
performs the standard 95% stator earth-fault protection
based on the neutral point fundamental frequency
displacement voltage.
The 100% stator earth fault protection requires the
injection unit REX060 and shunt resistor unit REX062 for
correct operation.
Underimpedance protection for generators and
transformers ZGVPDIS
The under impedance protection (ZGVPDIS) function is a
three zone full scheme impedance protection using
offset mho characteristics for detecting faults in the
generator, generator-transformer and transmission
system. The three zones have fully independent
measuring loops and settings. The functionality also
comprises an under voltage seal-in feature to ensure
issuing of a trip even if the current transformer goes
into saturation and, in addition, the positive-sequence-
based load encroachment feature for the second and the
third impedance zone. Built-in compensation for the
step-up transformer vector group connection is
available.
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6. Wide area measurement system

Synchrophasor report, 16 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
1MRK 502 074-BEN M
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