1．Introduction
1．1．Compliance with standards
GB/T 15576-2008 Low voltage reactive power compensation assemblies
GB/T 22582-2008 Power capacitors—Low-voltage power factor correction banks
JB/T 9663－1999 Low-voltage reactive power automatic compensation controller
1.2 Overview
SFR-M series low voltage intelligent power capacitor modules take two △type compensation
capacitors or one Y type compensation capacitor as main body and are highly integrated with
compound switch, microprocessor and other function modules. Due to their modularity structure,
they have such advantages as small volume and easy maintenance. SFR-M series power
capacitor modules are mainly used for reactive power compensation in the fields where harmonics
are not very serious. They are suitable for local compensation, dispersion compensation and
centralized compensation. This series of products adopt double zero-crossing switch technology
to make sure there is no over voltage or high inrush current during capacitor switching so as to
prolong capacitor life and switch life. SFR-M series capacitor modules have many protection
functions such as capacitor internal temperature protection, grid harmonic content protection, over
current protection, over voltage protection and three phase unbalance protection which make
them more reliable. This series of products adopt a using method of building blocks. If many
capacitors are used, one of them will become the master automatically, and others will become
slaves. Then a reactive automatic control system is built. If some of the slaves fail, they will exit
the system automatically without influencing other slaves; if the master fails, it also will exit the
system automatically, and then another new master appears and a new control system is built.
Meanwhile, SFR-M series capacitor modules are integrated with some functions of power meters
which can measure conventional electrical parameters of the power system.
2．Model selection
Reactance rate %
SFR M □□ □
Abbreviation for company name
Rated voltage, Unit V
Value of first group capacitor, Unit kvar
Product design number
Value of second group capacitor, Unit kvar
Power capacitor series
Note: total compensation for rated voltage 480V(P7) or 525V(P14), and separate compensation
for rated voltage 280V(P7) or 300V(P14).
