JPS5557159A - Constant supervisory method for cable anticorrosive layer - Google Patents
Constant supervisory method for cable anticorrosive layerInfo
- Publication number
- JPS5557159A JPS5557159A JP13089178A JP13089178A JPS5557159A JP S5557159 A JPS5557159 A JP S5557159A JP 13089178 A JP13089178 A JP 13089178A JP 13089178 A JP13089178 A JP 13089178A JP S5557159 A JPS5557159 A JP S5557159A
- Authority
- JP
- Japan
- Prior art keywords
- layer
- power source
- tanδ
- instrument
- anticorrosive layer
- 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
- 238000010521 absorption reaction Methods 0.000 abstract 1
- 230000007547 defect Effects 0.000 abstract 1
- 238000001514 detection method Methods 0.000 abstract 1
- 230000006866 deterioration Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 1
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
- Locating Faults (AREA)
- Examining Or Testing Airtightness (AREA)
- Testing Relating To Insulation (AREA)
Abstract
PURPOSE: To realize detection for the deterioration due to the minute defect, the water absorption of the anticorrosive layer and other factors by mrasuring the tan δ of the cable anticorrosive layer by means of the high frequency power source.
CONSTITUTION: The system comprises cable covering layer 1, coil L2 which is connected to layer 1 at one end with the other end earthed, dielectric loss tangent measuring instrument 4 containing the terminal which connects the non-grounded side of L2, and high frequency power source 5 which is applied to the high voltage side of instrument 4 respectively. As shown by the dotted line in the diagram, it is supposed to form a parallel circuit equivalently with equivalent electrostatic capacity CX and equivalent resistance RX between layer 1 and the ground. In this connection, if the balance of instrument 4 is secured for power source 5, the virtual dielectric loss tangent tanδ' and the true value tanδ to be measured are expressed as shown in the equation. In this case, angle frequency ω and inductance L are already obtained, and capacity CX can be measured. Thus genuine tanδ can be calculated.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13089178A JPS5557159A (en) | 1978-10-23 | 1978-10-23 | Constant supervisory method for cable anticorrosive layer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13089178A JPS5557159A (en) | 1978-10-23 | 1978-10-23 | Constant supervisory method for cable anticorrosive layer |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5557159A true JPS5557159A (en) | 1980-04-26 |
JPS6156790B2 JPS6156790B2 (en) | 1986-12-04 |
Family
ID=15045117
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13089178A Granted JPS5557159A (en) | 1978-10-23 | 1978-10-23 | Constant supervisory method for cable anticorrosive layer |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5557159A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0381671A (en) * | 1989-08-23 | 1991-04-08 | Mitsubishi Electric Corp | Insulation diagnostic device without power interruption |
JPH04208868A (en) * | 1990-11-20 | 1992-07-30 | Mitsubishi Electric Corp | Uninterruptible insulation diagnostic apparatus |
CN106291122A (en) * | 2016-08-04 | 2017-01-04 | 广东电网有限责任公司电力科学研究院 | The method of testing of a kind of oil immersed type condenser bushing watered and wetting defect and system |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61291886A (en) * | 1985-06-18 | 1986-12-22 | 中外炉工業株式会社 | Drier for coated strip |
-
1978
- 1978-10-23 JP JP13089178A patent/JPS5557159A/en active Granted
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0381671A (en) * | 1989-08-23 | 1991-04-08 | Mitsubishi Electric Corp | Insulation diagnostic device without power interruption |
JPH04208868A (en) * | 1990-11-20 | 1992-07-30 | Mitsubishi Electric Corp | Uninterruptible insulation diagnostic apparatus |
CN106291122A (en) * | 2016-08-04 | 2017-01-04 | 广东电网有限责任公司电力科学研究院 | The method of testing of a kind of oil immersed type condenser bushing watered and wetting defect and system |
Also Published As
Publication number | Publication date |
---|---|
JPS6156790B2 (en) | 1986-12-04 |
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