The following table shows the required measured values depending on the grid type. Based on the measurements, all characteristic values are calculated which are needed to assess the power quality.

Measured values

1-phase

3-phase without N/PE

3-phase with N/PE

U1

U12, U23, U31

U1, U2, U3

I1

I1, I2, I3

I1, I2, I3

Calculated characteristic values

Characteristic values

Calculation time

available for

Grid type (conductor)

Calculation interval

Half period

10/12

150/180

10 s

10 min

2 h

U

I

U*I

1

3

3+N

Phase

Grid

RMS value1

X

X

X

X

X

X

X

X

-

X

X

X

X

-

Peak value1

X

X

X

X

X

X

X

X

X

X

X

X

X

-

Rectified value1

X

X

X

X

X

X

X

X

-

X

X

X

X

-

Form factor1

-

X

X

X

X

X

X

X

-

X

X

X

X

-

Crest factor1

-

X

X

X

X

X

X

X

-

X

X

X

X

-

Frequency2

X

X

X

X

X

X

X

X

-

X

X

X

X

X

Phase angle6

-

X

X

X

X

X

X

X

-

X

X

X

X

-

Harmonics1

-

X

X

X

X

X

X

X

X

X

X

X

X

-

Interharmonics1

-

X

X

X

X

X

X

X

X

X

X

X

X

-

THD3

-

X

X

X

X

X

X

X

X

X

X

X

X

-

TIF1

-

X

X

X

X

X

X

X

-

X

X

X

X

-

Mains signalling voltage1

-

X

X

X

X

X

X

-

-

X

X

X

X

-

Power1

-

X

X

X

X

X

-

-

X

X

X

X

X

X

Energy4

-

X

X

X

X

X

-

-

X

X

X

X

X

X

Apparent power1

-

X

X

X

X

X

-

-

X

X

X

X

X

X

Apparent energy4

-

X

X

X

X

X

-

-

X

X

X

X

X

X

Reactive power1

-

X

X

X

X

X

-

-

X

X

X

X

X

X

Reactive energy4

-

X

X

X

X

X

-

-

X

X

X

X

X

X

Reactive power with sign1

-

X

X

X

X

X

-

-

X

X

X

X

X

X

Reactive power with sign4

-

X

X

X

X

X

-

-

X

X

X

X

X

X

Explanation: X = available, - = not available

1 Quadratic average of 10/12 period values

2 Direct calculation from raw values for all above-listed calculation times

3 Calculation from the harmonics of the listed calculation time

4 Aggregation based on calculation time

5 No aggregation

6 Phase of the 10/12 FFT sum vector

Characteristic values

Calculation time

available for

Grid type (conductor)

Calculation interval

Half

period

10/

12

150/

180

10s

10

min

2

2 h

U

I

U*I

1

3

3+N

Phase

Grid

Reactive energy with sign4

-

X

X

X

X

X

-

-

X

X

X

X

X

X

Power factor1

-

X

X

X

X

X

-

-

X

X

X

X

X

X

Cos φ1

-

X

X

X

X

X

-

-

X

X

X

X

X

-

Positive sequence component1

-

X

X

X

X

X

X

X

-

-

-

X

-

X

Negative sequence component1

-

X

X

X

X

X

X

X

-

-

-

X

-

X

Zero sequence component1

-

X

X

X

X

X

X

X

-

-

-

X

-

X

Supply voltage unbalance (negative sequence component) 1

-

X

X

X

X

X

X

-

-

-

X

X

-

X

Supply voltage unbalance (zero sequence component)1

-

X

X

X

X

X

X

-

-

-

-

X

-

X

Flicker P_inst5

X

-

-

-

-

-

X

X

-

X

X

X

X

-

Flicker P_st5

-

-

-

-

X

-

X

X

-

X

X

X

X

-

Flicker P_lt5

-

-

-

-

-

X

X

X

-

X

X

X

X

-

Events5

-

X

-

-

-

-

X

-

-

X

X

X

-

X

Commutation notches5

X

-

-

-

-

-

X

-

-

X

X

X

X

-

Explanation: X = available, - = not available

1 Quadratic average of 10/12 period values

2 Direct calculation from raw values for all above-listed calculation times

3 Calculation from the harmonics of the listed calculation time

4 Aggregation based on calculation time

5 No aggregation

6 Phase of the 10/12 FFT sum vector