Metering - ABB Relion 670 Series Product Manual

Bay control REC670
Version 2.2
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
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.

18. 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
Hitachi Power Grids
GUID-868ED1BB-A921-45DE-94C4-0CF23ECD9ADA v1
th
order. It
M13394-3 v7
GUID-6898E29B-DA70-421C-837C-1BBED8C63A7A v3
© Copyright 2017 Hitachi Power Grids. All rights reserved
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
EnaAcc setting and it can be reset to
and STOPACC) and
initial values with RSTACC input.
The maximum demand for active and reactive powers
are calculated for the set time interval
these values are updated every minute through output
channels. The active and reactive maximum power
demand values are calculated for both forward and
reverse direction and these values can be reset with
RSTDMD input.
1MRK 511 404-BEN N
tEnergy and
45