JPS5677768A - Water tree detecting method for rubber/plastic insulated power cable - Google Patents
Water tree detecting method for rubber/plastic insulated power cableInfo
- Publication number
- JPS5677768A JPS5677768A JP15352679A JP15352679A JPS5677768A JP S5677768 A JPS5677768 A JP S5677768A JP 15352679 A JP15352679 A JP 15352679A JP 15352679 A JP15352679 A JP 15352679A JP S5677768 A JPS5677768 A JP S5677768A
- Authority
- JP
- Japan
- Prior art keywords
- cable
- water tree
- wave
- conductor
- cut
- 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
- Testing Relating To Insulation (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
PURPOSE: To realize a quick and accurate detection of the water tree, by applying the DC cut-wave between the conductor of the cable to be tested and the cable masking metal tape and at the same time giving a comparison of the DC leak current between the cables before after the area of application of the DC cut-wave.
CONSTITUTION: The ball gap 2 is provided to the cable 1 to be tested and in parallel between the cable conductor 3 and the cable masking metal tape 4, and the DC high voltage generator 5 is connected to the gap 2. Then the fixed DC voltage V0 is applied to the cable 1 by the generator 5, and then the gap 2 is short- circuited. Thus the repetitive high voltage of the rectangular attenuation vibration wave having such waveform as shown in the figure and the cycle T is applied between the conductor 3 and the tape 4. And the electric tree is caused in case the water tree is caused in the insulator of the cable. Accordingly, the existence of the water tree can be detected by giving a comparison to the DC leak currents before and after application of the DC cut-wave.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15352679A JPS5677768A (en) | 1979-11-29 | 1979-11-29 | Water tree detecting method for rubber/plastic insulated power cable |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15352679A JPS5677768A (en) | 1979-11-29 | 1979-11-29 | Water tree detecting method for rubber/plastic insulated power cable |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5677768A true JPS5677768A (en) | 1981-06-26 |
JPS6330584B2 JPS6330584B2 (en) | 1988-06-20 |
Family
ID=15564447
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15352679A Granted JPS5677768A (en) | 1979-11-29 | 1979-11-29 | Water tree detecting method for rubber/plastic insulated power cable |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5677768A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014109475A (en) * | 2012-11-30 | 2014-06-12 | Central Research Institute Of Electric Power Industry | Water tree degradation detector of power cable using pulse voltage, water tree degradation detection method of power cable using pulse voltage |
-
1979
- 1979-11-29 JP JP15352679A patent/JPS5677768A/en active Granted
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014109475A (en) * | 2012-11-30 | 2014-06-12 | Central Research Institute Of Electric Power Industry | Water tree degradation detector of power cable using pulse voltage, water tree degradation detection method of power cable using pulse voltage |
Also Published As
Publication number | Publication date |
---|---|
JPS6330584B2 (en) | 1988-06-20 |
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