Insulation state measurement method, insulation state judgement apparatus, and dispersion type power generating system using the same

An apparatus for determining an insulating state of a power source comprising:

• means provided with a circuit comprising power conversion means for converting an input power into a different power output and the power source, said power conversion means being connected through an electric path to said power source, for forming a short circuit by said power source and said electric path in the circuit, and for forming an open circuit by said power conversion means and said electric path;
• voltage applying means for applying a voltage to said short circuit;
• current measuring means for measuring a current generated by the applied voltage;
• and
• means for determining the insulating state of said power source based on the current value measured by said current measuring means.

A power generating system comprising:

• means, provided with power conversion means for converting an input D.C. power into an A.C. power output and a D.C. power source, said power conversion means and said D.C. power source being connected through a D.C. two wire electric path, for forming a short circuit by said D.C. power source and said D.C. two wire electric path, and for forming an open circuit by said power conversion means and said D.C. two wire electric path;
• voltage applying means for applying a voltage to said short circuit;
• current measuring means for measuring a current generated by the applied voltage;
• means for determining an insulating state of said D.C. power source based on a value of the current measured by said current measuring means;
• and
• monitor means for monitoring a result of the determining by said determining means.