JPS57207875A - Insulation failure detecting method of power cable - Google Patents
Insulation failure detecting method of power cableInfo
- Publication number
- JPS57207875A JPS57207875A JP56093246A JP9324681A JPS57207875A JP S57207875 A JPS57207875 A JP S57207875A JP 56093246 A JP56093246 A JP 56093246A JP 9324681 A JP9324681 A JP 9324681A JP S57207875 A JPS57207875 A JP S57207875A
- Authority
- JP
- Japan
- Prior art keywords
- power cable
- corona pulse
- noise
- bpf
- insulation failure
- 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
- 238000009413 insulation Methods 0.000 title abstract 2
- 238000000034 method Methods 0.000 title 1
- 230000002159 abnormal effect Effects 0.000 abstract 2
- 239000013307 optical fiber Substances 0.000 abstract 2
- 239000012212 insulator Substances 0.000 abstract 1
- 230000003287 optical effect Effects 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/58—Testing of lines, cables or conductors
Abstract
PURPOSE:To detect insulation failure of a power cable being in a hot-line state, with a high S/N ratio, by fetching a corona pulse current flowing to a ground wire by a transformer, removing an external noise by a BPF, and also using an optical fiber for transmitting a signal to an abnormal state indicator. CONSTITUTION:When an insulator of a power cable becomes faulty, a corona pulse current flowing to a ground wire 2 generates a secondary current in a secondary side coil 3b of a transformer 3. When this secondary current passes through a BPF 4 having a band characteristic of 20-100KHz, a corona pulse of a wide band is selected, and it becomes a specific frequency by which a noise of commercial frequency, a noise radio frequency, etc. are small. The corona pulse of this specific frequency is rectified by a rectifying circuit 5 which has bridge-coupled diodes 5a-5d, and drives a light emission diode 6. An optical output from this light emission diode 6 is transmitted by an optical fiber 7, reaches a photodetector 8 installed at a remote place, is converted to an electric signal, and is displayed on a abnormal state indicator 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56093246A JPS57207875A (en) | 1981-06-17 | 1981-06-17 | Insulation failure detecting method of power cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56093246A JPS57207875A (en) | 1981-06-17 | 1981-06-17 | Insulation failure detecting method of power cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS57207875A true JPS57207875A (en) | 1982-12-20 |
Family
ID=14077145
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56093246A Pending JPS57207875A (en) | 1981-06-17 | 1981-06-17 | Insulation failure detecting method of power cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57207875A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0302747A2 (en) * | 1987-08-07 | 1989-02-08 | Mitsui Petrochemical Industries, Ltd. | Method for assessing insulation conditions |
| JPH0339670A (en) * | 1989-07-06 | 1991-02-20 | Tokyo Electric Power Co Inc:The | Partial discharge measuring method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS507571A (en) * | 1973-05-18 | 1975-01-25 | ||
| JPS5466480A (en) * | 1977-11-07 | 1979-05-29 | Showa Electric Wire & Cable Co | Method of measuring partial discharge of electric cable and its device |
-
1981
- 1981-06-17 JP JP56093246A patent/JPS57207875A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS507571A (en) * | 1973-05-18 | 1975-01-25 | ||
| JPS5466480A (en) * | 1977-11-07 | 1979-05-29 | Showa Electric Wire & Cable Co | Method of measuring partial discharge of electric cable and its device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0302747A2 (en) * | 1987-08-07 | 1989-02-08 | Mitsui Petrochemical Industries, Ltd. | Method for assessing insulation conditions |
| EP0544646A2 (en) * | 1987-08-07 | 1993-06-02 | Mitsui Petrochemical Industries, Ltd. | Apparatus for assessing insulation conditions |
| JPH0339670A (en) * | 1989-07-06 | 1991-02-20 | Tokyo Electric Power Co Inc:The | Partial discharge measuring method |
| JPH0585033B2 (en) * | 1989-07-06 | 1993-12-06 | Tokyo Electric Power Co |
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