Fuji Electric ALPHA7, User Manual

Page: 623 / 662

CHAPTER 15 STANDARDS COMPLIANCE
15-10
Complying with "Guideline for Suppressing Harmonics by Customers Receiving High Voltage
or Special High Voltage"
15
(1) Regulation scope
Generally speaking, regulations apply if the following two conditions are satisfied.

The device is receiving high or extra-high voltage.

Converter load "equivalent capacity" exceeds the standard value (50kVA when receiving 6.6 kV)
for the receiving voltage.
If calculating "equivalent capacity" in accordance with the guidelines, a supplementary description
is provided in "15.4.2.1 Equivalent Capacity Calculation".
(2) Regulation method
Regulate the size (calculated value) of the harmonic current flowing from the customer's power
receipt point to the system. Regulation values are proportional to contracted demand. Guideline
regulation values are shown in Table 15.4-1.
If calculating "harmonic current" in accordance with the guidelines, a supplementary description is
provided in "15.4.2 Complying with "Guideline for Suppressing Harmonics by Customers
Receiving High Voltage or Special High Voltage".
Table 15.4-1 Harmonic outflow current upper limit per 1kW of contracted demand (mA/kW)
Receiving
voltage
5th 7th 11th 13th 17th 19th 23rd 25th and
above
6.6 kV 3.5 2.5 1.6 1.3 1.0 0.90 0.76 0.70
22 kV 1.8 1.3 0.82 0.69 0.53 0.47 0.39 0.36
15.4.2 Complying with "Guideline for Suppressing Harmonics by
Customers Receiving High Voltage or Special High Voltage"
If performing calculations for "servo amplifiers" in accordance with the guidelines, do so as follows.
15.4.2.1 Equivalent Capacity Calculation
Equivalent capacity is calculated by multiplying the (input rated capacity) by (conversion factor),
however, the input rated capacity value is not indicated in servo amplifier catalogs, and is therefore
described below.
(1) Servo amplifier rated capacity equivalent 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 servo amplifier input rated capacity as a value including
the harmonic current equivalent to conversion factor 1.

To be more specific, input fundamental harmonic current I1 is calculated as follows from the kW
rating and efficiency of the motor (load) and efficiency of the servo amplifier: