Measured Quantities – Power, Power Factor, Energy
act. / react. power uncertainty
PF & cos φ uncertainty
+/- 0.005
act. / react. power uncertainty
PF & cos φ uncertainty
+/- 0.005
temperature drift of powers
Energy
measuring range
6 „quadrants“, corresponds to U & I measuring ranges
active energy uncertainty
class 0.5S acc. to EN 62053 – 22
reactive energy uncertainty
class 2 acc. to EN 62053 – 23
Active / Reactive Power, Power Factor (PF), cos φ ( P
NOM
= U
NOM
x I
NOM
)
reference conditions “A” :
ambient temperature ( t
A
)
U, I
for active power, PF, cos φ
for reactive power
23 ±2 ºC
U = 80 ÷ 120 % U
NOM
, I = 1 ÷ 120 % I
NOM
PF = 1.00
PF = 0.00
± 0.5 % of rdg ± 0.005 % P
NOM
“reference conditions ”B” :
ambient temperature ( t
A
)
U, I
for active power, PF, cos φ
for reactive power
23 ±2 ºC
U = 80 ÷ 120 % U
NOM
, I = 2 ÷ 120 % I
NOM
PF >= 0.5
PF <= 0.87
± 1 % of rdg ± 0.01 % P
NOM
+/- 0.05 % od rdg ± +/- 0.02 % P
NOM
/ 10 ºC
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