Fuji Electric FRENIC MEGA G2 Series - Complying with Guideline for Suppressing Harmonics by Customers Receiving; High Voltage or Special High Voltage; 1 ] Calculation of Equivalent Capacity (Pi)

Appendix B Japanese Guideline for Suppressing Harmonics by Customers Receiving High
Voltage or Special High Voltage (General-purpose Inverters)
Appendix-15
APPENDICES
B.2 Complying with "Guideline for Suppressing Harmonics by Customers Receiving
High Voltage or Special High Voltage"
If performing calculations for "general-purpose inverters" in accordance with the guidelines, do so as follows.
The following descriptions are based on “Application Guide for Evaluation of Harmonic Currents Emitted by
Consumers of Middle or High Voltage Power Supply” (JEAG 9702-2013) published by the Japan Electrical
Manufacturer’s Association (JEMA).
[ 1 ] Calculation of equivalent capacity (Pi)
Equivalent capacity is calculated by multiplying the (input rated capacity) by (conversion factor), however, the input
rated capacity value is not indicated in previous general-purpose inverter catalogs, and is therefore described below.
(1) “Inverter rated capacity” corresponding to “Pi”
• In the guidelines, a 6-pulse converter is used as a reference for conversion factor 1, and therefore it is necessary
to express the general-purpose inverter input rated capacity as a value including the harmonic current equivalent
to conversion factor 1.
• In particular, calculate the input fundamental current I1 from the kW rating and efficiency of the motor and the
efficiency of the inverter as loads and then calculate:
Input rated capacity= √3 x (power voltage) x I1 x 1.0228/1000 (kVA). 1.0228 is the 6-pulse converter (effective
value current)/(fundamental harmonic current) value.
• When a general-purpose motor or inverter motor is used, the appropriate value shown in Table B.2-1 can be
used. Select a value based on the kW rating of the motor used, irrespective of the inverter type.
The "input rated capacity" expressed here can be applied only if performing the calculation indicated in
the harmonic guidelines, and cannot be used to select inverter power supply side devices and wiring size,
etc., and therefore caution is required.
 Refer to manufacturer catalogs or technical material for information on peripheral equipment capacity
selection.
Table B.2-1 “Input Rated Capacities” of general-purpose inverters determined by the applicable motor ratings
Applicable motor
(kW)
0.1
0.2
0.4
0.75
1.5
2.2
3.7
5.5
7.5
11
15
18.5
Pi (kVA)
200 V
0.22
0.35
0.57
0.97
1.95
2.81
4.61
6.77
9.07
13.1
17.6
21.8
400 V
0.22
0.35
0.57
0.97
1.95
2.81
4.61
6.77
9.07
13.1
17.6
21.8
Applicable motor
(kW)
22
30
37
45
55
75
90
110
132
160
Pi (kVA)
200 V
25.9
34.7
42.8
52.1
63.7
87.2
104
127
400 V
25.9
34.7
42.8
52.1
63.7
87.2
104
127
153
183
Applicable motor
(kW)
200
220
250
280
315
355
400
450
500
630
Pi (kVA)
200 V
400 V
229
252
286
319
359
405
456
512
570
718
(2) “Ki (conversion factor)” size
Depending on whether an optional ACR (AC reactor) or DCR (DC reactor) is used, apply the appropriate conversion
factor specified in the appendix to the guideline. The conversion factor sizes are listed in Table B.2-2.
Table B.2-2 “Conversion Factors Ki” for general-purpose inverters determined by reactors
Circuit
class
Circuit type
Conversion factor Ki
Main applications
3
Three-phase bridge
(capacitor smoothing)
No reactor used
K31 = 3.4
• General-purpose inverters
Reactor used (AC side)
K32 = 1.8
• Elevators
Reactor used (DC side)
K33 = 1.8
• Cold air refrigerating machines
Reactor used (AC, DC side)
K34 = 1.4
• Other equipment in general
Some models are equipped with a reactor as a standard accessory.