Hitachi Relion 670 Series Product Manual page 56
Line differential protection
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Also See for Relion 670 Series:
- Applications manual (438 pages) ,
- Commissioning manual (284 pages) ,
- Product manual (121 pages)
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Line differential protection RED670
Version 2.2
attach a RANGE aspect to an analog value and to permit
measurement supervision on that value.
Measured value expander block RANGE_XP
The current and voltage measurements functions
(CVMMXN, CMMXU, VMMXU and VNMMXU), current and
voltage sequence measurement functions (CMSQI and
VMSQI) and IEC 61850 generic communication I/O
functions (MVGAPC) are provided with measurement
supervision functionality. All measured values can be
supervised with four settable limits: low-low limit, low limit,
high limit and high-high limit. The measure value expander
block (RANGE_XP) has been introduced to enable
translating the integer output signal from the measuring
functions to 5 binary signals: below low-low limit, below low
limit, normal, above high limit or above high-high limit. The
output signals can be used as conditions in the configurable
logic or for alarming purpose.
Insulation supervision for gas medium function
SSIMG
Insulation supervision for gas medium (SSIMG ) is used for
monitoring the circuit breaker condition. Binary information
based on the gas pressure in the circuit breaker can be
used as input to the function. In addition, the function can
be used with an analog value of gas pressure and
temperature of the insulation medium and binary inputs. The
SSIMG function generates alarms based on the received
information.
Insulation supervision for liquid medium SSIML
Insulation supervision for liquid medium (SSIML) is used for
monitoring the oil insulated device condition. For example,
transformers, shunt reactors, and so on. Binary information
based on the liquid level in the circuit breaker can be used
as input to the function. In addition, the function can be
used with an analog value of liquid level and temperature of
the insulation medium and binary inputs. The function
generates alarms based on the received information.
Circuit breaker condition monitoring SSCBR
The circuit breaker condition monitoring function (SSCBR)
is used to monitor different parameters of the breaker
condition. The breaker requires maintenance when the
number of operations reaches a predefined value. For a
proper functioning of the circuit breaker, it is essential to
monitor the circuit breaker operation, spring charge
indication or breaker wear, travel time, number of operation
cycles and estimate the accumulated energy during arcing
periods. Each SCCBR function instance is made to be used
with a 1-pole, 1-phase breaker.
Event counter with limit supervison L4UFCNT
The Limit counter (L4UFCNT) provides a settable counter
with four independent limits where the number of positive
and/or negative flanks on the input signal are counted
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against the setting values for limits. The output for each
limit is activated when the counted value reaches that limit.
Overflow indication is included for each up-counter.
Running hour-meter TEILGAPC
The Running hour-meter (TEILGAPC) function is a function
that accumulates the elapsed time when a given binary
signal has been high.
The main features of TEILGAPC are:
• Applicable to very long time accumulation (≤ 99999.9
hours)
• Supervision of limit transgression conditions and rollover/
overflow
• Possibility to define a warning and alarm with the
resolution of 0.1 hours
• Retain any saved accumulation value at a restart
• Possibilities for blocking and reset
• Possibility for manual addition of accumulated time
• Reporting of the accumulated time
Through fault monitoring PTRSTHR
The through fault monitoring function PTRSTHR is used to
monitor the mechanical stress on a transformer and place it
against its designed withstand capability. During through
faults, the fault-current magnitude is higher as the allowed
overload current range. At low fault current magnitudes
which are below the overload capability of the transformer,
mechanical effects are considered less important unless the
frequency of fault occurrence is high. Since through fault
current magnitudes are typically closer to the extreme
design capabilities of the transformer, mechanical effects
are more significant than thermal effects.
For other power system objects, for example, an over-head
line, this function can be used to make a log of primary
quantities of a protected line.
Current harmonic monitoring CHMMHAI
Current harmonic monitoring function CHMMHAI is used to
monitor the current part of the power quality of a system. It
calculates the total harmonic distortion (THD) with respect
to fundamental signal amplitude, and the total demand
distortion (TDD) with respect to maximum demand load
current. These indices indicate the current signal quality
factor.
Additionally, the function is used to calculate the numerical
multiple of rated frequency harmonics amplitude and
harmonic distortion up to 9
the predominant harmonic frequencies order and their
amplitudes present in the system. The function also
calculates the crest factor to indicate the effectiveness of
the signal. All calculations in the harmonic monitoring
function are based on IEEE 1459 and IEEE 519-2014
standards.
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order. It helps the user to know
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