Doc
#
E159708
11-4
11: Meter Calculations
Electro
Industries/GaugeTech
™
Powered by Innovation™
Total average Power Factor:
//bi-Quadrant measurement; “Q1+4,” Q2+3”
Phase Angle:
8. Total Harmonic Distortion:
9. K-Factor for Current:
10. Total Demand Distortion;
(I
L-RMS
: average max. load current, set by user):
11. Voltage Unbalance:
Unbalance 0 sequence = 0 sequence magnitude / + sequence magnitude
Unbalance - sequence = -sequence magnitude / + sequence magnitude
12. Current Unbalance:
13. Transformer Loss:
ܲܨ
௧௧
.
௩
_
ொଵାସ
=
ௐ
,
ೂభశర
,
ೂభశర
;
ܲܨ
௧௧
.
௩
_
ொଶାଷ
=
ௐ
,
ೂమశయ
,
ೂమశయ
ɔ
= cos
ିଵ
(
ܲܨ
)
g
THD
ೃಾೄ
=
ටσ
(
ೃಾೄ
)
మ
యవ
సమ
ೃಾೄ
భ
// Voltage
THD
ூ
ೃಾೄ
=
ටσ
(
ூ
ೃಾೄ
)
మ
యవ
సమ
ூ
ೃಾೄ
భ
// Currents
THD
ೃಾೄ
[%] = 100 ×
ටσ
(
ೃಾೄ
)
మ
యవ
సమ
ೃಾೄ
భ
// Voltage
THD
ூ
ೃಾೄ
[%] = 100 ×
ටσ
(
ூ
ೃಾೄ
)
మ
యవ
సమ
ூ
ೃಾೄ
భ
// Currents
KFactor
ூ
[%] = 100 ×
σ
(
݄
×
ܫ
ோெௌ
)
ଶ
ଷଽ
ୀଵ
σ
(
ܫ
ோெௌ
)
ଶ
ଷଽ
ୀଵ
;
(
ோெௌ
݃
ݕ
)
TDD
ூ
ೃಾೄ
=
ටσ
(
ூ
ೃಾೄ
)
మ
యవ
సమ
ூ
ಽషೃಾೄ
TDD
ூ
ೃಾೄ
[%] = 100 ×
ටσ
(
ூ
ೃಾೄ
)
మ
యవ
సమ
ூ
ಽషೃಾೄ
ܫܯܤ
ூ
ೃಾೄ
=
ܯܣܺ
.
ቄቚࡵ
ࡾࡹࡿ
ࢇ࢜ࢍ
.
െ
ܫ
ோெௌ
ೌ
ቚ
,
ቚࡵ
ࡾࡹࡿ
ࢇ࢜ࢍ
.
െ
ܫ
ோெௌ
್
ቚ
,
ቚࡵ
ࡾࡹࡿ
ࢇ࢜ࢍ
.
െ
ܫ
ோெௌ
ቚቅ
ܫ
ோெௌ
ೌೡ
.
// where:
ࡵ
ࡾࡹࡿ
ࢇ࢜ࢍ
.
=
ூ
ೃಾೄೌ
ା
ூ
ೃಾೄ್
ା
ூ
ೃಾೄ
ଷ
ܹ
்௧
்௦
௦௦
=
ܸܣ
்௦
ி௨
ௌ
×
ቈ
%LWFE ×
൬
Vmeasured
ܸ݈݊݉݅݊ܽ
൰
ଶ
+ %LWCU ×
൬
Imeasured
ܫ݈݊݉݅݊ܽ
൰
ଶ
ܸܣܴ
்௧
்௦
௦௦
=
ܸܣ
்௦
ி௨
ௌ
×
ቈ
%LVFE ×
൬
Vmeasured
ܸ݈݊݉݅݊ܽ
൰
ସ
+ %LVCU ×
൬
Imeasured
ܫ݈݊݉݅݊ܽ
൰
ଶ