Title:
INSULATION DETECTOR AND ELECTRICAL DEVICE
Document Type and Number:
WIPO Patent Application WO/2015/076075
Kind Code:
A1
Abstract:
An insulation detector (30) that is connected to an electrical device provided with a device capacitor and/or battery for detecting or measuring, with a high degree of precision and a simple architecture, insulation resistance with respect to a housing or ground for a device or a load. Said insulation detector (30) is provided with an insulation-detector capacitor (31), a voltage detection unit (33) that detects the voltage across said insulation-detector capacitor (31), and a current-path-forming switch (32) for forming a current path that includes the insulation resistance of the electrical device. Said current-path-forming switch (32) connects the following in series: ground or a housing, the device capacitor (22), and the insulation-detector capacitor (31). The voltage detection unit (33) measures the aforementioned insulation resistance by measuring the time constant of changes in the voltage across the insulation-detector capacitor (31). Relative to the magnitude of the capacitance of the device capacitor (22), the magnitude of the capacitance of the insulation-detector capacitor (31) is such that said capacitance can be disregarded when measuring the insulation resistance.
Inventors:
TAMIDA TAICHIRO (JP)
UEMATSU MASAYUKI (JP)
TANABE AKIRA (JP)
HAYASHI YOSHITOMO (JP)
TSUTSUMISHITA YOJI (JP)
TSUJIKAWA KOSUKE (JP)
UEMATSU MASAYUKI (JP)
TANABE AKIRA (JP)
HAYASHI YOSHITOMO (JP)
TSUTSUMISHITA YOJI (JP)
TSUJIKAWA KOSUKE (JP)
Application Number:
PCT/JP2014/078635
Publication Date:
May 28, 2015
Filing Date:
October 28, 2014
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP (JP)
International Classes:
G01R31/02; G01R31/34
Foreign References:
| JP2010239822A | 2010-10-21 | |||
| JP2005016958A | 2005-01-20 | |||
| JPH08226950A | 1996-09-03 |
Attorney, Agent or Firm:
SAKAI, HIROAKI (JP)
Hiroaki Sakai (JP)
Hiroaki Sakai (JP)
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