Earth leakage detection method
AssigneeDaikin Industries, Ltd.
InventorsHiroshi Doumae, Hitoshi Hashimoto
Life of this patent
Estimating the term…
Abstract
It is judged whether the abnormal current is due to the electric leakage or not by a detection step detecting the abnormal current by the leakage current detection board and comparing a threshold value of predetermined items stored in a storing unit and actual values corresponding to the items at the time of when a compressor is stopped by detecting the abnormal current in the detection step. Specifically, the abnormal current is recognized as the electric leakage to be displayed on a display unit when at least one of the operating time at the time of detecting the abnormal current, the inner pressure of a motor, and a discharge pipe temperature is lower than the corresponding threshold value.
Claims20
An electric leakage detection method in a power supply system including:
- an electrical circuit;
- an opening and closing means switching conduction (opening)/non-conduction (closing) of said electrical circuit;
- an electric power load connected to said electrical circuit through said opening and closing means;
- an operation abnormality detecting means detecting operation abnormality of said electric power load;
- an abnormal current detecting means detecting abnormal current;
- and
- a controlling means controlling said opening and closing means,
- the electric leakage detection method comprising the steps of:
- (a) judging whether the abnormal current is detected or not in said electrical circuit;
- (b) judging whether said electric power load is operation abnormality or not when the judgment in said step (a) is positive;
- (c) judging that the electric leakage is generated in said electrical circuit when the judgment in said step (b) is negative;
- and
- (d) judging that the electric leakage is not generated in said electrical circuit when the judgment in said step (b) is positive.
Dependencies are inferred from the claim text.