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Consumption
analysis method for
optimizing reactive
compensation MV
Essential to take measures
reactive power to be compensated must be chosen after making a measurement
with a network analyzer?
How many ?
Period of time
“Large enough to be considered as a representative and realistic”
< t >
Samplingfrequency
Period of time
“Use a sampling rate as low as possible to observe more closely the fluctuations of loads”
Seasonality
< t >
Period of time
Samplingfrequency
“Power consumption may differ depending on the time of year”
Existing capacitor
bank
< t >
Period of time
Samplingfrequency
Seasonality
“A capacitor bank will interfere with the acquired data and distort the data collected”
Analyzing the measurements
A histogram is a graphical representation ofthe distribution of numerical data. It is an estimate ofthe probability distribution of a continuous variable.
Roughly assess the probability distribution of a givenvariable by depicting the frequencies of observationsoccurring in certain ranges of values
Histogram
Histogram
Measure Histogram Analyze
Histogram
Three-phase Inductive reactive power consumptionMeasures at 6,6 kV
Histogram
Interval size
𝑆 =𝑋𝑀𝐴𝑋 − 𝑋𝑀𝐼𝑁
2 · 𝑁
Maximum value Minimum value
Number of values
Histogram
< i >
Interval
Data
Excel
Histogram
Histogram
Interval Frequency % accumulated
100 0 0,00%
200 0 0,00%
300 0 0,00%
400 0 0,00%
500 65 11,40%
600 29 16,49%
700 20 20,00%
800 12 22,11%
900 52 31,23%
1000 73 44,04%
1100 66 55,61%
1200 21 59,30%
1300 17 62,28%
1400 115 82,46%
1500 48 90,88%
1600 3 91,40%
1700 23 95,44%
1800 14 97,89%
1900 1 98,07%
2000 3 98,60%
2100 4 99,30%
2200 0 99,30%
2300 1 99,47%
2400 0 99,47%
2500 0 99,47%
2600 3 100,00%
500+1000 kvar
Histogram
cos phi above 0,95 more than 98% of the time
Harmonics in the installation
Parallel Resonance
𝑓𝑅 = 𝑓 ∙𝑆𝑆𝐶𝑄
Parallel Resonance
Damage in MV capacitor due
parallel resonance
Parallel Resonance