JPS56126770A - Measuring device for insulation resistance of corrosion- proof layer of cable - Google Patents
Measuring device for insulation resistance of corrosion- proof layer of cableInfo
- Publication number
- JPS56126770A JPS56126770A JP3031580A JP3031580A JPS56126770A JP S56126770 A JPS56126770 A JP S56126770A JP 3031580 A JP3031580 A JP 3031580A JP 3031580 A JP3031580 A JP 3031580A JP S56126770 A JPS56126770 A JP S56126770A
- Authority
- JP
- Japan
- Prior art keywords
- intermediary
- corrosion
- layer
- voltage
- operational amplifier
- 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
- 230000007797 corrosion Effects 0.000 abstract 2
- 238000005260 corrosion Methods 0.000 abstract 2
- 230000006698 induction Effects 0.000 abstract 2
- 238000005259 measurement Methods 0.000 abstract 2
- 230000035945 sensitivity Effects 0.000 abstract 2
- 239000003990 capacitor Substances 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
PURPOSE:To improve the sensitivity of measurement by using an operational amplifier to integrate induction AC voltage and thereby dispensing with a filter for intercepting alternating current. CONSTITUTION:When a switch 31 is closed, the interception of alternating current between the shielding layer 13A of an embedded cable and earth is performed through the intermediary of a capacitor 22. And, since DC current from a DC power source 32 connected to earth flows through the intermediary of resistors 38 and 37 according to the corrosion of the layer 13A, the potential at the voltage-parting point 39 of the resisters 38 and 37 falls down. This falling DC current and the induction AC voltage through the intermediary of the layer 13A are processed by the operational amplifier OP forming an integrator 33, and thereby the variation of the insulation resistance due to the corrosion of the layer 13A is measured through direct reading with no influence of an AC component by means of a meter 34 through the intermediary of the integrator 33. Accordingly, a constitution whereform the filter prepared by using a resistor, etc for eliminating a high-region component is removed is obtained, whereby the component of alternating current is removed excellently and also the sensitivity of measurement is improved by the amplifying operation of the operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3031580A JPS56126770A (en) | 1980-03-12 | 1980-03-12 | Measuring device for insulation resistance of corrosion- proof layer of cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3031580A JPS56126770A (en) | 1980-03-12 | 1980-03-12 | Measuring device for insulation resistance of corrosion- proof layer of cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS56126770A true JPS56126770A (en) | 1981-10-05 |
Family
ID=12300355
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3031580A Pending JPS56126770A (en) | 1980-03-12 | 1980-03-12 | Measuring device for insulation resistance of corrosion- proof layer of cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56126770A (en) |
-
1980
- 1980-03-12 JP JP3031580A patent/JPS56126770A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP1042651B1 (en) | Electrode integrity checking | |
| KR850004801A (en) | Relative Distribution Device of Pulverized Coal | |
| ATE33313T1 (en) | APPARATUS FOR DETECTING AND MEASURING A CURRENT ON A POWER TRANSMISSION LINE. | |
| JPS56143915A (en) | Measuring device for gas flow rate | |
| JPS55113911A (en) | Karman vortex flow meter | |
| ES8205314A1 (en) | Direct readout apparatus for measuring light transmitted through liquids | |
| JPS5818102A (en) | Capacitive displacement gauge | |
| JPS55155258A (en) | Device for measuring characteristic of gapless arrester | |
| JPS56126770A (en) | Measuring device for insulation resistance of corrosion- proof layer of cable | |
| JPS5697865A (en) | Ionization detector | |
| EP0027181A3 (en) | Electro-magnetic flow meter | |
| SU505392A3 (en) | Measuring system to control the launch and change of power of the nuclear rector | |
| JPS5512401A (en) | Eddy current type range finder | |
| JPS5523443A (en) | Flow-rate measuring method by electromagnetic flow meter | |
| SU628445A1 (en) | Biomass counting device | |
| SU387298A1 (en) | DEVICE FOR MEASURING ELECTRIC POWER | |
| JPS5565116A (en) | Measuring unit for gas flow rate | |
| JPS55119064A (en) | Surface electrometer | |
| JPS5624551A (en) | Device for measuring corrosion speed of metal | |
| SU1420538A1 (en) | Method of measuring charging current in dielectric liquid flow | |
| JPS5567658A (en) | Measurement unit for poly phase alternating current | |
| JPS5393072A (en) | Earthing resistance measuring apparatus | |
| JPS56111470A (en) | Resistance measuring method | |
| JPS54153700A (en) | Discontinuity measuring apparatus of metal surface condition | |
| JPS559129A (en) | Measuring method for resistance of corrosion protective covering |