ABB Relion 670 Series Applications Manual page 511

1MRK 511 401-UUS F
17.13.3.1 Setting procedure on the IED
Parameters for CHMMHAI(ITHD) function are set via the local HMI or PCM600.
Common base IED values for primary current (
function GBASVAL.
GlobalBaseSel : It is used to select GBASVAL function for reference of base values.
MaxLoadCurr : Maximum demand load current at PCC for total demand distortion calculation.
When the point of common coupling (PCC) is considered at the service entrance or utility metering
point, IEEE 519 standard recommends that the maximum demand load current must be calculated
as the average current of maximum demand for the preceding 12 months.
WrnLimitTDD : It defines the warning limit for the calculated total demand distortion. Harmonic
current distortions on a power systems with ratio between the maximum short circuit current to
the maximum demand load current is 20, limited to 5% of the total demand distortion (TDD).
tDelayAlmTDD : It defines the alarm delay time from warning for the calculated total demand
distortion.
WrnLimitTHD : It defines the warning limit for the calculated total harmonic distortion.
tDelayAlmTHD : It defines the alarm delay time from warning for the calculated total harmonic
distortion. This intimates the operator to take corrective operations immediately, otherwise the
system will undergo thermal stress.
WrnLimit2ndHD : It defines the warning limit for the calculated second harmonic distortion.
tDelayAlm2ndHD : It defines the alarm delay time from warning for the calculated second harmonic
distortion.
WrnLimit3rdHD : It defines the warning limit for the calculated third harmonic distortion.
tDelayAlm3rdHD : It defines the alarm delay time from warning for the calculated third harmonic
distortion.
WrnLimit4thHD : It defines the warning limit for the calculated fourth harmonic distortion.
tDelayAlm4thHD : It defines the alarm delay time from warning for the calculated fourth harmonic
distortion.
WrnLimit5thHD : It defines the warning limit for the calculated fifth harmonic distortion.
tDelayAlm5thHD : It defines the alarm delay time from warning for the calculated fifth harmonic
distortion.
Bay control REC670
Application manual
Minimum and maximum current limit is set as 5% of the
respectively. If the current is outside the above range, the calculation of total
harmonic distortion, individual harmonic distortion, total demand distortion and
crest factor are blocked and outputs are provided as zero.
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IBase ) is set in the global base values for settings
Section 17
Monitoring
GUID-A773AE35-1480-4C07-9894-908229DC3BC7 v1
GUID-F41E3011-637C-46C6-BA99-4F8C48AC79B5 v2
IB and 300.0% of IB
505