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