ABB Relion 670 Series Applications Manual page 513

1MRK 511 401-UUS F
point of common coupling. It should not be applied to either individual pieces of equipment or at
locations within a user's facility. In most cases, harmonic voltages and currents at these locations
could be found to be significantly beyond recommended limits at the PCC due to the lack of
diversity, cancellation, and other phenomena that tend to reduce the combined effects of multiple
harmonic sources to levels below their algebraic summation.
17.14.3.1 Setting procedure on the IED
Parameters for VHMMHAI(VTHD) function are set via the local HMI or PCM600.
Common base IED values for primary voltage (
function GBASVAL.
GlobalBaseSel : It is used to select GBASVAL function for reference of base values.
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 voltage limit is set as 5% of the
respectively. If the voltage is outside the above range, the calculation of total
harmonic distortion, individual harmonic distortion and crest factor are blocked
and outputs are provided as zero.
© Copyright 2017 ABB. All rights reserved
UBase ) is set in the global base values for settings
Section 17
Monitoring
GUID-60CEC5EC-19DC-49E6-946C-FE3883B67975 v1
GUID-B3611E99-63AD-4722-BFAA-3BC089F9AFF6 v2
UB and 300.0% of UB
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