Page 10 - ECLECTIC MARCH-2022 INSIDE PAGES_p2.indd
P. 10
le 4:
Voltage THD Value % Carrent THD Value %
DTR Load Nature Load at time of 3rd 3rd 5th 7th
Details Phase inspection (A) THD harmonics THD Harmonics harmonics harmonics
Commercial
Rashbehari (market area) R 80 1.9 0.3 11.5 8.5 6.1 4
Avenue (S)
Y 65 1.6 0.3 14.2 11.9 0.5 5.2
O/T
B 63 1.7 0.6 13.1 5 1 6.6
N 32 123.1 122.5 0.6 5.6
Table 5:
Voltage THD Value % Carrent THD Value %
DTR Load at time of 3rd 3rd 5th 7th
Details Load Nature Phase inspection (A) THD harmonics THD Harmonics harmonics harmonics
5.6
Broad St Predominantly R 84 1.7 0.5 7 4 2.8 3.1
(E) O /T domestic along Y 83 1.5 0.2 7.3
No. 2 B 82 1.3 0.3 44.2 4.8 2.4 3.1
with a single N 11
service to a 5.3 2.4 2.2
nursing home
43.3 2.4 4.7
Table 6: Voltage THD Value % Carrent THD Value %
3rd 5th 7th
DTR Load at time of 3rd THD Harmonics harmonics harmonics
Details Load Nature Phase inspection (A) THD harmonics 12.6 5.8 4.8 10.2
7.9 2.2 3.4 3.2
Service to Medical R 10 1.6 0.5 21.2 15.7 11 7.6
Repose Equipment 52 44.1 16.4 10.3
Nursing Y 19.5 1.5 0.3
Home
B 11.8 1.3 0.2
N 10
CALCULATION OF HARMONIC LOSS have not been considered in these calculations should
also be delved deeper into in the upcoming days. The
In LT distribution network, harmonic current only flow equations for the calculation are given below:
through the distribution network consisting of cables,
overhead lines, pillar boxes etc. So, for calculation, we Ih per phase = ITotal*THD*DPF
consider the heating loss due to harmonic current in the
three phases and the neutral for each DTR. The actual Loss U = (IhR2+ IhY2+ IhB2) * Rphase + IhN2 * Rneutral
system losses will be much higher if we incorporate ➤ But in our case, the measuring device used for
increased hysteresis and eddy current losses. Further, the
loss reflection in the upstream HT/EHT network which harmonic measurement has provided us the KW
readings for the harmonics which is equal to the
harmonic power loss in the network.
10
Voltage THD Value % Carrent THD Value %
DTR Load Nature Load at time of 3rd 3rd 5th 7th
Details Phase inspection (A) THD harmonics THD Harmonics harmonics harmonics
Commercial
Rashbehari (market area) R 80 1.9 0.3 11.5 8.5 6.1 4
Avenue (S)
Y 65 1.6 0.3 14.2 11.9 0.5 5.2
O/T
B 63 1.7 0.6 13.1 5 1 6.6
N 32 123.1 122.5 0.6 5.6
Table 5:
Voltage THD Value % Carrent THD Value %
DTR Load at time of 3rd 3rd 5th 7th
Details Load Nature Phase inspection (A) THD harmonics THD Harmonics harmonics harmonics
5.6
Broad St Predominantly R 84 1.7 0.5 7 4 2.8 3.1
(E) O /T domestic along Y 83 1.5 0.2 7.3
No. 2 B 82 1.3 0.3 44.2 4.8 2.4 3.1
with a single N 11
service to a 5.3 2.4 2.2
nursing home
43.3 2.4 4.7
Table 6: Voltage THD Value % Carrent THD Value %
3rd 5th 7th
DTR Load at time of 3rd THD Harmonics harmonics harmonics
Details Load Nature Phase inspection (A) THD harmonics 12.6 5.8 4.8 10.2
7.9 2.2 3.4 3.2
Service to Medical R 10 1.6 0.5 21.2 15.7 11 7.6
Repose Equipment 52 44.1 16.4 10.3
Nursing Y 19.5 1.5 0.3
Home
B 11.8 1.3 0.2
N 10
CALCULATION OF HARMONIC LOSS have not been considered in these calculations should
also be delved deeper into in the upcoming days. The
In LT distribution network, harmonic current only flow equations for the calculation are given below:
through the distribution network consisting of cables,
overhead lines, pillar boxes etc. So, for calculation, we Ih per phase = ITotal*THD*DPF
consider the heating loss due to harmonic current in the
three phases and the neutral for each DTR. The actual Loss U = (IhR2+ IhY2+ IhB2) * Rphase + IhN2 * Rneutral
system losses will be much higher if we incorporate ➤ But in our case, the measuring device used for
increased hysteresis and eddy current losses. Further, the
loss reflection in the upstream HT/EHT network which harmonic measurement has provided us the KW
readings for the harmonics which is equal to the
harmonic power loss in the network.
10
