Import (imp):
Consumption energy
Export (exp):
Generating energy
Total: Absolute sum of import and export energy
Net: Algebraic sum of import and export energy
Reactive power: Reactive energy is time integral of reactive power. The unit
is Kvarh. As reactive power has direction, positive means inductive and negative
means capacitive, so the reactive energy has also got the nature of inductive and
capacitive.
Import (imp): Inductive reactive energy
Export (exp): Capacitive reactive energy
Total: Absolute sum of import and export reactive energy
Net: Algebraic sum of import and export reactive energy
Each of the four reactive energies is measured and stored independently.
Demand:
Demand of power, reactive power and apparent power. The demand
statistics method in
Ai
205 is sliding window. The sliding window time can be
chose between 1 to 30 Minutes. The window slides one Minute each time. For
example, the sliding window time is supposed to be 3 Minute. If average power
of the first Minute is 12, average power of the second Minute is 14 and average
power of the third Minute is 10, then the total demand of the 3 minutes is
(12+14+10)/3=12 at the end of the three Minute. If another Minute passed, the
average power of the Minute is 8, then the total power demand of the last three
Minute is (14+10+8)/3=10 at the end of the fourth Minute.
Crest factor (CF):
The crest factor is used to express the distortion of
waveform. This is an important factor to scale the influence to the system insulation.
The expression is as following:
In the expression, U1 is the RMS of fundamental and Uh is the RMS of the h
th
harmonic.
53
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Summary of Contents for Ai205
Page 1: ......
Page 12: ...Chapter 2 Installation Appearance and Dimensions Installation method Wiring of Ai205 7 ...
Page 26: ...3 2LN 2CT 4 2LN 1CT 5 2LL 3CT 21 Fig 2 20 2LN 2CT Fig 2 21 2LN 1CT Fig 2 22 2LL 3CT ...
Page 98: ...Appendix Appendix A Technical data and specifications Appendix B Ordering 93 ...
Page 103: ......