STETZERiZER Filters - For Home and Office
A new application of existing science and technology designed to improve power
quality in home and office environments
System Overview
The STETZERiZER filter is based upon 100 year-old science and power engineering
principles. Newly introduced is the design, which is focused on the needs of the
customers in homes, offices, schools, etc. Filters have been extensively applied
for decades by industrial users and the electric utility industry itself. The
STETZERiZER filter is designed to filter harmonics and other high frequency current
(trash) from the electrical environment, thereby reducing the potential for leakage
into the human environment and creating additional trash in non-liner loads (televisions,
computers, variable frequency drives, energy-efficient lighting, etc.).
The high frequency current (trash) on the neutral wire in the electrical system
is positioned to return directly to the power system via the feeder neutral to
the substation, and possibly beyond. However, as is often the case, the utility
feeder neutral is not adequately sized (as required by the Public Service Commission
of Wisconsin). If this is the case, much of the return current will flow through
the ground rather than the feeder neutral. Under these conditions, the STETZERiZER
filters still provide benefits; this should be seen as local mitigation rather
than part of a complete solution that requires an adequately sized neutral return.
At 60 Hz the filters act as capacitors and normally marginally improve the power
factor of the customer load, which are normally slightly inductive.
Typical Home Installation
Filters are designed to be installed throughout the home in a pattern that corresponds
to the distributed nature of the need. For example, installing two filters close
to a desktop computer or a television is normally appropriate and effective. Installing
filters, normally from two to six, close to the input power panel is recommended
to address high frequency currents entering on the power lines. The total number
of filters required depends on the size of the home, the amount of electrical
equipment, and the quality of the power from the grid. Twenty filters are normally
adequate for a "typical" house.
Installing an inadequate number of filters tends to result in overloaded filters,
leading to an ineffective solution. The preferred installation method is to be
guided by the STETZERiZER Microsurge Meter, which measures the amount of high
frequency energy present.
Readings of 30 or lower indicate an acceptable environment, while readings of 50 or higher
indicate a need for additional filters.
Readings between 30 and 50 are marginally acceptable, but should be reduced if anyone
in the area is electrically sensitive.
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