ABB Relion 670 Series Applications Manual page 410

Section 14
Monitoring
14.11.4 Setting guidelines
The recommended limits for total harmonic distortion and individual harmonic distortion are available in
the IEEE 519-2014 standard. The limits are based on measurements which are done at the 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.
14.11.4.1 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 (UBase) is set in the global base values for settings
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. According to
standard IEEE 519-2014, harmonic voltage distortions on a power system 161 kV and above is limited to
1.5% total harmonic distortion (THD) with each individual harmonic limited to 1.0%.
tDelayAlmTHD: It defines the alarm time limit for the calculated total harmonic distortion which is applied
after the warning signal pickup and depends on its sustainability. This intimates the operator to take
corrective operations immediately, otherwise the system will go under thermal stress.
WrnLimit2ndHD: It defines the warning limit for the calculated second harmonic distortion. According to
standard IEEE 519-2014, harmonic voltage distortions on power system 161 kV and above is limited to
1.0% for each individual harmonic.
tDelayAlm2ndHD: It defines the alarm time limit for the calculated second harmonic distortion which is
applied after the warning signal pickup and depends on its sustainability.
WrnLimit3rdHD: It defines the warning limit for the calculated third harmonic distortion. According to
standard IEEE 519-2014, harmonic voltage distortions on power system 161 kV and above is limited to
1.0% for each individual harmonic.
tDelayAlm3rdHD: It defines the alarm time limit for the calculated third harmonic distortion which is
applied after the warning signal pickup and depends on its sustainability.
WrnLimit4thHD: It defines the warning limit for the calculated fourth harmonic distortion. According to
standard IEEE 519-2014, harmonic voltage distortions on power system 161 kV and above is limited to
1.0% for each individual harmonic.
tDelayAlm4thHD: It defines the alarm time limit for the calculated fourth harmonic distortion which is
applied after the warning signal pickup and depends on its sustainability.
404
Minimum and maximum voltage limit is set as 5% of the UB and 300.0% of UB
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.
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1MRK 505 370-UUS Rev. K
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Busbar protection REB670
Application manual