JPS5670465A - Measuring device for insulation resistance - Google Patents
Measuring device for insulation resistanceInfo
- Publication number
- JPS5670465A JPS5670465A JP14800379A JP14800379A JPS5670465A JP S5670465 A JPS5670465 A JP S5670465A JP 14800379 A JP14800379 A JP 14800379A JP 14800379 A JP14800379 A JP 14800379A JP S5670465 A JPS5670465 A JP S5670465A
- Authority
- JP
- Japan
- Prior art keywords
- component
- leak current
- adder add
- insulation resistance
- zero
- 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.)
- Granted
Links
Landscapes
- Emergency Protection Circuit Devices (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
PURPOSE: To enable highly precise measurement of an effective component by the insulation resistance in a leak current by a method wherein the leak current detected by a zero-phase current transformer is corrected automatically by a signal based on the voltage phase at 90 degrees and the component generated by a suspension capacity is removed.
CONSTITUTION: The leak current detected by the zero-phase current transformer ZIT is added to an adder ADD through a buffer amplifier BA. Meanwhile, to the adder ADD is also added the current corresponding to the line voltage phase at 90 degrees and reversed in polarity by a transformer TRO, a phaseshifter PS, an inverter INV, etc., and the output of the adder ADD is processed by multipliers MULT1, LPF and LPF1 and becomes a required DC component. When a variable attenuator VR is controlled for feedback so as for the component to be zero, the leak current component corresponding to the suspension capacity outputted by the adder ADD is corrected automatically, whereby the highly precise measurement of the effective component by the insulation resistance in the leak current can be performed.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP54148003A JPS6042419B2 (en) | 1979-11-14 | 1979-11-14 | Insulation resistance measuring device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP54148003A JPS6042419B2 (en) | 1979-11-14 | 1979-11-14 | Insulation resistance measuring device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5670465A true JPS5670465A (en) | 1981-06-12 |
JPS6042419B2 JPS6042419B2 (en) | 1985-09-21 |
Family
ID=15442930
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP54148003A Expired JPS6042419B2 (en) | 1979-11-14 | 1979-11-14 | Insulation resistance measuring device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6042419B2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58127172A (en) * | 1982-01-26 | 1983-07-28 | Toyo Commun Equip Co Ltd | Insulation resistance measuring apparatus for electric line with suppressed stray capacity |
WO1988004055A1 (en) * | 1981-07-01 | 1988-06-02 | Tatsuji Matsuno | Method and device for detecting insulation resistance |
US4980645A (en) * | 1988-02-22 | 1990-12-25 | Hitachi Cable, Ltd. | Method for diagnosing an insulation deterioration of a power cable |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01127631U (en) * | 1988-02-10 | 1989-08-31 |
-
1979
- 1979-11-14 JP JP54148003A patent/JPS6042419B2/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1988004055A1 (en) * | 1981-07-01 | 1988-06-02 | Tatsuji Matsuno | Method and device for detecting insulation resistance |
JPS58127172A (en) * | 1982-01-26 | 1983-07-28 | Toyo Commun Equip Co Ltd | Insulation resistance measuring apparatus for electric line with suppressed stray capacity |
US4980645A (en) * | 1988-02-22 | 1990-12-25 | Hitachi Cable, Ltd. | Method for diagnosing an insulation deterioration of a power cable |
Also Published As
Publication number | Publication date |
---|---|
JPS6042419B2 (en) | 1985-09-21 |
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