GB494345A - Improvements relating to the testing of electrical apparatus - Google Patents
Improvements relating to the testing of electrical apparatusInfo
- Publication number
- GB494345A GB494345A GB1205937A GB1205937A GB494345A GB 494345 A GB494345 A GB 494345A GB 1205937 A GB1205937 A GB 1205937A GB 1205937 A GB1205937 A GB 1205937A GB 494345 A GB494345 A GB 494345A
- Authority
- GB
- United Kingdom
- Prior art keywords
- resistor
- tube
- parallel
- insulation
- megohms
- 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.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/16—Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
- G01R27/18—Measuring resistance to earth, i.e. line to ground
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
494,345. Indicating faults ; measuring resistances. NORTH METROPOLITAN ELECTRIC POWER SUPPLY CO., and SHOTTER, G. F. April 27, 1937, No. 12059, [Class 37] Pressure tests of insulation are effected by applying a potential through a resistor in parallel with a gaseous discharge device, a condenser being alternatively switched in parallel in place of the resistor. With resistor 1, Fig. 1, in parallel to the discharge tube 4, and the load at 5 subject therefore to the continuous supply from transformer 7, the tube 4 should not glow if the insulation is sound. With the condenser 3 in circuit instead of the resistor 1, the rate of flashing of the tube 4 will be a measure of insulation resistance. Resistor 10 limits the short-circuit current, and the apparatus can thus be employed in continuity tests. In another arrangement, Fig. 2, the discharge tube is in parallel with a variable resistor 11 and the amount of resistance required to light the tube 4 is a measure of the resistance under test, the resistor 11 being calibrated in megohms. A fixed resistor 12 may be connected in series with resistor 11, and a variable shunt resistor 13 is provided for use if the glow is too faint. Resistor 13 can also be calibrated in megohms and a single reading in respect of resistors 11, 13 obtained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1205937A GB494345A (en) | 1937-04-27 | 1937-04-27 | Improvements relating to the testing of electrical apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1205937A GB494345A (en) | 1937-04-27 | 1937-04-27 | Improvements relating to the testing of electrical apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB494345A true GB494345A (en) | 1938-10-25 |
Family
ID=9997669
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1205937A Expired GB494345A (en) | 1937-04-27 | 1937-04-27 | Improvements relating to the testing of electrical apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB494345A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2812491A (en) * | 1957-01-11 | 1957-11-05 | American Cyanamid Co | Electrical tester for non-metallic linings |
-
1937
- 1937-04-27 GB GB1205937A patent/GB494345A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2812491A (en) * | 1957-01-11 | 1957-11-05 | American Cyanamid Co | Electrical tester for non-metallic linings |
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