JPS55147357A - Method of testing insulation using asymmetrical ac voltage - Google Patents
Method of testing insulation using asymmetrical ac voltageInfo
- Publication number
- JPS55147357A JPS55147357A JP5409779A JP5409779A JPS55147357A JP S55147357 A JPS55147357 A JP S55147357A JP 5409779 A JP5409779 A JP 5409779A JP 5409779 A JP5409779 A JP 5409779A JP S55147357 A JPS55147357 A JP S55147357A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- power source
- insulation
- measured
- increment
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Testing Relating To Insulation (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
PURPOSE: To easily measure the insulation of a material to be measured by applying an asymmetrical AC voltage to the material to be measured and detecting the existence or nonexistence of a minute value in increment of a DC flowing a resistor for detecting the increment.
CONSTITUTION: A DC voltage and an AC voltage form a DC power source DC and an AC power source AC respectively are superimposed, and applied to an insulated material X of a material to be measured. When the voltage of the AC power source at the time of starting the insulation test is made zero and the voltage of a boosting transformer TR on the AC power source side is increased by means of a voltage regulator SR, a current flowing through a minute current increment detecting resistor r increases stepwise. The stepwise variation indicated in an indication instrument M means that air bubbles or gaps are present in the material to be tested, and expresses the insulation thereof.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5409779A JPS55147357A (en) | 1979-05-04 | 1979-05-04 | Method of testing insulation using asymmetrical ac voltage |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5409779A JPS55147357A (en) | 1979-05-04 | 1979-05-04 | Method of testing insulation using asymmetrical ac voltage |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55147357A true JPS55147357A (en) | 1980-11-17 |
Family
ID=12961112
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5409779A Pending JPS55147357A (en) | 1979-05-04 | 1979-05-04 | Method of testing insulation using asymmetrical ac voltage |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55147357A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6291868A (en) * | 1985-10-17 | 1987-04-27 | Hitachi Cable Ltd | Diagnostic method for insulating deterioration of electric equipment |
US5276401A (en) * | 1990-01-09 | 1994-01-04 | Hitachi Cable, Ltd. | Method for diagnosing an insulation deterioration of an electric apparatus |
-
1979
- 1979-05-04 JP JP5409779A patent/JPS55147357A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6291868A (en) * | 1985-10-17 | 1987-04-27 | Hitachi Cable Ltd | Diagnostic method for insulating deterioration of electric equipment |
JPH0554913B2 (en) * | 1985-10-17 | 1993-08-13 | Hitachi Cable | |
US5276401A (en) * | 1990-01-09 | 1994-01-04 | Hitachi Cable, Ltd. | Method for diagnosing an insulation deterioration of an electric apparatus |
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