Kikusui KHA3000, Operation Manual, Page: 140 / 392

140
KHA3000
Estimating the Rsce (61000-3-12)
Searching for the Minimum Rsce Value with the Measured
Monitor Values Displayed (61000-3-12 2004 only)
Measured monitor values indicate the current status of the EUT. It is not a function to observe
all the operation cycles of the EUT.
Measured monitor value
●
Table format of measured monitor
The measured monitor table is formatted to always display L1, L2 and L3, irrespective of
equipment settings. L1, L2 and L3 correspond to LOAD terminals L1, L2 and L3 on the
rear of this product.
●
Sequ, Ssc and 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.
CH Factor Rsce Sequ (VA) Ssc (W) Z (Ohm) THD (%) PWHD (%)
Phase of
measurement
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)
Measured
monitor value
3