JPS6473260A - Insulation characteristic measuring apparatus for insulator - Google Patents
Insulation characteristic measuring apparatus for insulatorInfo
- Publication number
- JPS6473260A JPS6473260A JP22973687A JP22973687A JPS6473260A JP S6473260 A JPS6473260 A JP S6473260A JP 22973687 A JP22973687 A JP 22973687A JP 22973687 A JP22973687 A JP 22973687A JP S6473260 A JPS6473260 A JP S6473260A
- Authority
- JP
- Japan
- Prior art keywords
- insulator
- waveform
- coefficient
- voltage
- waveforms
- 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
- Measurement Of Resistance Or Impedance (AREA)
Abstract
PURPOSE:To enable automatic measurement of a loss of an insulator at a high accuracy while permitting the learning of the state of insulation from the degree of distortion, by calculating a coefficient of mutual correlation between a voltage waveform applied to the insulator and a current waveform flowing therethrough. CONSTITUTION:An impedance 2 for voltage waveforms is connected in parallel to an AC power source 1 and an insulator 3 and an impedance 4 for measuring current waveforms are connected between a high voltage terminal of the AC power source 1 and the earth. Outputs of the impedances 2 and 4 are stored into a memory of a waveform memory 5 by one to several cycles through an A/D converter. An arithmetic device 6 calculates a mean of voltage waveforms and current waveforms to subtract it from a sample value data for each waveform and after the removal of a DC component, a self-covariance coefficient is calculated. Then, a mutual covariance coefficient is calculated and a self-covariance coefficient is normalized to calculate a mutual correlation coefficient. Then, a time difference between a voltage waveform and a current waveform is determined so as to give the mutual correlation coefficient the max. value thereby obtaining an insulating property of the insulator.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22973687A JPS6473260A (en) | 1987-09-16 | 1987-09-16 | Insulation characteristic measuring apparatus for insulator |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22973687A JPS6473260A (en) | 1987-09-16 | 1987-09-16 | Insulation characteristic measuring apparatus for insulator |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6473260A true JPS6473260A (en) | 1989-03-17 |
Family
ID=16896883
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP22973687A Pending JPS6473260A (en) | 1987-09-16 | 1987-09-16 | Insulation characteristic measuring apparatus for insulator |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6473260A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108362947A (en) * | 2018-01-31 | 2018-08-03 | 南京航空航天大学 | Buck class straight convertor output capacitance loss tangent monitoring methods and system |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5770468A (en) * | 1980-10-21 | 1982-04-30 | Yokogawa Hewlett Packard Ltd | Impedance measuring device |
-
1987
- 1987-09-16 JP JP22973687A patent/JPS6473260A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5770468A (en) * | 1980-10-21 | 1982-04-30 | Yokogawa Hewlett Packard Ltd | Impedance measuring device |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108362947A (en) * | 2018-01-31 | 2018-08-03 | 南京航空航天大学 | Buck class straight convertor output capacitance loss tangent monitoring methods and system |
CN108362947B (en) * | 2018-01-31 | 2020-08-07 | 南京航空航天大学 | Method and system for monitoring loss tangent value of output capacitor of Buck-type direct-current converter |
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