Kikusui KHA3000, Operation Manual, Page: 113 / 392

5
KHA3000
113
61000-3-12
Setting the Harm
onic Test
Measured monitor value
●
Table format of measured monitor
The measured monitor table is formatted to always display L1, L2 and L3, irrespective of
equipment type settings. L1, L2 and L3 correspond to LOAD terminals L1, L2 and L3 on
the rear of this product.
●
Sequ, Ssc, Z
The Sequ, Ssc and Z values are calculated for each phase of L1, L2 and L3 and
displayed. The formulas for computation are shown in the table above.
●
Calculating and displaying the minimum Rsce value that satisfies a limit value
The minimum Rsce value that satisfies the limit 1 of each phase is calculated from
harmonic orders (I
2
to I
13
) or measured value of the THD or PWHD according to the
setting of the applied limit value. The “ Factor ” column indicates the harmonic order, the
THD or the PWHD that is the lowest factor for the margin.
The Rsce value is calculated for each phase of L1, L2 and L3. Set the maximum value out
of the L1, L2 and L3 phases as the judgment Rsce value that is necessary for satisfying
the limit value. The set judgment Rsce value becomes the minimum Rsce value in the
standard limit value table.
●
Calculating short-circuit power Ssc and system impedance Z
The short-circuit power Ssc and system impedance Z are calculated from the calculated
Rsce value and the rated apparent power of a device. The short-circuit power Ssc
indicates the minimum value of a connectable system, and the system impedance Z
indicates the maximum value of a connectable system.
●
Rsce of hybrid equipment
The Rsce of a hybrid equipment executes tests for each component. Measured monitor
values, therefore, are observed for each component. From among the calculated Rsce
values of the components, the maximum value is employed.
CH Factor Rsce Sequ (VA) Ssc (W) Z (Ohm) THD (%) PWHD (%)
Phase of
measuring
circuit
L1
L2
L3 Harmonic
orders 2nd
to 40th,
THD,
PWHD Short-
circuit ratio Rated
apparent
power of
equipment Short-
circuit
power System
impedance Total
harmonic
distortion Partial
weighted
harmonic
distortion
– Calculated
value Calculated
value Calculated
value Calculated
value Measured
value Measured
value
Calculating
Formula Rated apparent power (Sequ) of single-phase equipment = Rated voltage (phase voltage)
(Up)
× Rated current (lequ)
Rated apparent power (Sequ) of three-phase/three-wire equipment = Rated voltage (line
voltage) (Ui)
× Rated current (lequ)
Rated apparent power (Sequ) of balanced three-phase equipment = × Rated voltage
(line voltage) (Ui) × Rated current (lequ)
Rated apparent power (Sequ) of unbalanced three-phase equipment = 3 × Rated voltage
(phase voltage) (Up) × Rated current (lequ)
Short-circuit power (Ssc) = Short-circuit ratio (Rsce) × (3 × Rated apparent power (Sequ)
of single-phase equipment)
Short-circuit power (Ssc) = Short-circuit ratio (Rsce)
× (2 × Rated apparent power (Sequ)
of three-phase/three-wire equipment)
Short-circuit power (Ssc) = Short-circuit ratio (Rsce)
× Rated apparent power (Sequ) of all
three-phase equipment
System impedance (Z) = (Nominal system voltage (Unom))
2
/Short-circuit power (Ssc)
3