Metering - ABB Relion 670 Series Product Manual

Generator protection REG670
Version 2.2
between measured value and calculated value of the top
oil temperature.
Additionally, the function calculates loss of life in form
of days and years. This information is updated at
settable intervals, for example, hourly or daily.
Transformer winding percentage loss of life is
calculated every day and the information is provided as
total percentage loss of life from the installation date
and yearly percentage loss of life.
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 upto the 5
helps the user to know 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 standards.
The current harmonic function monitors the harmonic
distortion and demand distortion values constantly.
Whenever these value crosses their set limit levels, a
warning signal will be initiated. If the warning signal
persists continuously for the set time, an alarm signal
will be generated.
Voltage harmonic monitoring VHMMHAI
Voltage harmonic monitoring function VHMMHAI is used
to monitor the voltage part of the power quality of a
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system. It calculates the total harmonic distortion (THD)
with respect to the fundamental signal amplitude which
indicates the voltage signal quality factor.
Additionally, the function is used to calculate the
numerical multiple of rated frequency harmonics
amplitude and harmonic distortion upto the 5
helps the user to know 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 standards.
The voltage harmonic function monitors the harmonic
distortion value constantly. Whenever these value
crosses their set limit levels, a warning signal will be
initiated. If the warning signal persists continuously for
the set time, an alarm signal will be generated.

16. Metering

Pulse-counter logic PCFCNT
Pulse-counter logic (PCFCNT) function counts externally
generated binary pulses, for instance pulses coming
from an external energy meter, for calculation of energy
consumption values. The pulses are captured by the
binary input module and then read by the PCFCNT
function. A scaled service value is available over the
station bus. The special Binary input module with
enhanced pulse counting capabilities must be ordered
to achieve this functionality.
Function for energy calculation and demand
handling ETPMMTR
Power system measurement (CVMMXN) can be used to
measure active as well as reactive power values.
Function for energy calculation and demand handling
(ETPMMTR) uses measured active and reactive power as
input and calculates the accumulated active and reactive
energy pulses, in forward and reverse direction. Energy
values can be read or generated as pulses. Maximum
demand power values are also calculated by the
function. This function includes zero point clamping to
remove noise from the input signal. As output of this
function: periodic energy calculations, integration of
energy values, calculation of energy pulses, alarm
signals for limit violation of energy values and maximum
power demand, can be found.
The values of active and reactive energies are calculated
from the input power values by integrating them over a
tEnergy . The integration of active and
selected time
reactive energy values will happen in both forward and
reverse directions. These energy values are available as
output signals and also as pulse outputs. Integration of
energy values can be controlled by inputs (STARTACC
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