Insulation state measurement method, insulation state judgement

Details Insulation state measurement method, insulation state judgement Insulation state measurement method, insulation state judgement

1995-04-25

1998-01-27

Arana, Louis M.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

324509, H01H 3112

Patent

active

057125724

ABSTRACT:
An object of the present invention is to provide an insulation state measurement method and a judgement apparatus for a power conversion system, which can monitor the insulation state of an electric path with one end to which a power scarce is connected, or the power source itself in a non-use state of the power source, and can prevent an unexpected failure.
A solar cell array connected to one end of an electric path is set in a non-grounded state upon operation of a change-over switch, and a measurement switch which receives an operation command from an operating circuit temporarily applies a high voltage to the electric path. A current detector detects a weak current flowing through connection lines, and supplies detection data to an insulation judgement unit. The insulation judgement unit calculates the insulator resistance on the basis of the magnitude of the applied voltage, and the magnitude of the weak current detected by the current detector. If an abnormality is detected, information indicating the abnormality is displayed on a display unit. In this manner, an unexpected failure can be avoided.

REFERENCES:
patent: 4206398 (1980-06-01), Janning
patent: 4638245 (1987-01-01), MacPhee et al.
patent: 4810972 (1989-03-01), Appleby, Jr et al.
patent: 4896115 (1990-01-01), LeMaitre et al.
patent: 5155441 (1992-10-01), Zelm

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