Islanding Protection Device of a Distributed Generators by Interharmonics Injection
Method
The interharmonics injection method, an proprietary method of Nissin Electric, offers superior reliability contributimg to the spread
of dispersed power system for various applications such as new energy. Since first introducing
these devices in 2001, we have delivered over 150units, to approximately 90% of the prefectures in Japan.
When connecting new energy and other dispersed power sources to an existing power
system, a method to detect island operation (the state of electricity
being supplied from a dispersed power source in the event of
an power outage) is required.
This device monitors system impedance by injecting minute interharmonics
(non-integer multiple harmonics, such as x 2.6 etc) into the
system, detecting island operation by observing the changes
in impedance after the transition to island operatio.
Features
Minimal affect on the system.
No interference among multiple dispersed power sources (including this product)
are set up on a single distribution line.
Detection is possible in only about 1 second.
Applicable to all types of dispersed power sources.
Only one Islanding Protection Device required for one power source facility
regardless of the number of generators.
