GB701412A - Improvements in or relating to testing apparatus for short circuited turns - Google Patents
Improvements in or relating to testing apparatus for short circuited turnsInfo
- Publication number
- GB701412A GB701412A GB23049/51A GB2304951A GB701412A GB 701412 A GB701412 A GB 701412A GB 23049/51 A GB23049/51 A GB 23049/51A GB 2304951 A GB2304951 A GB 2304951A GB 701412 A GB701412 A GB 701412A
- Authority
- GB
- United Kingdom
- Prior art keywords
- coil
- coils
- core
- turns
- tested
- 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
- 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
- G01R31/72—Testing of electric windings
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/20—Measuring number of turns; Measuring transformation ratio or coupling factor of windings
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Magnetic Treatment Devices (AREA)
Abstract
701,412. Testing for faults. FORTIPHONE, Ltd. Sept. 25,1952 [Oct. 3, 1951], No. 23049/51. Class 37 A coil to be tested for short-circuited turns and number of turns is linked with the field threading a pair of coils in a magnetic bridge, which coils are coupled to a local oscillator, the signals :from the pair of coils being rectified and fed to a D.C. bridge circuit. A magnetic core 1 carries three coils 2, 3, 4 forming a magnetic bridge. The central coil 2 is fed from a local oscillator 5, and the coils 3, 4 are connected together and earthed at their junction. The coils 3, 4 are connected to similar valve amplifiers 6, 7 followed by rectifiers 9, 10. The rectified outputs are passed to a D.C. bridge balance circuit 11, the output of which is fed to an indicating meter 12. The apparatus is first balanced, so that the indicator 12 reads zero. A coil 15 to be tested is then slipped over one end of the core 1 and an indication is given if the coil contains short-circuited turns. The magnetic bridge portion 1, 2, 3, 4 is preferably made as a separate unit enclosed in a casing from which projects the end of the core over which coils 15 are to be placed for testing. This unit is made with plug-in terminals so that it can be plugged into a second unit containing the parts 6, 7, 9, 10, 11, 12. To test a coil for correct number of turns the apparatus is given a predetermined degree of unbalance, and the coil to be tested is shortcircuited and placed over the end of the core. Balance is restored if the number of turns is correct. The predetermined degree of unbalance may be introduced by means of an adjustable attenuator in the output circuit of one of the coils 3, 4. Alternatively, a standard coil of the correct number of turns is shortcircuited and placed on one end of the core. The coil to be tested is shortcircuited and placed on the other end of the core. Balance is restored if the number of turns is correct. Instead of a straight core in the magnetic bridge, a T-shaped core may be employed, the central limb carrying the coil 2.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB23049/51A GB701412A (en) | 1951-10-03 | 1951-10-03 | Improvements in or relating to testing apparatus for short circuited turns |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB23049/51A GB701412A (en) | 1951-10-03 | 1951-10-03 | Improvements in or relating to testing apparatus for short circuited turns |
Publications (1)
Publication Number | Publication Date |
---|---|
GB701412A true GB701412A (en) | 1953-12-23 |
Family
ID=10189274
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB23049/51A Expired GB701412A (en) | 1951-10-03 | 1951-10-03 | Improvements in or relating to testing apparatus for short circuited turns |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB701412A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1281574B (en) * | 1962-03-16 | 1968-10-31 | Eiwa Denki Co Ltd | Circuit for testing a winding with an iron core for the presence of a short-circuit turn |
GB2212927A (en) * | 1987-11-30 | 1989-08-02 | Plessey Co Plc | Testing coils |
-
1951
- 1951-10-03 GB GB23049/51A patent/GB701412A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1281574B (en) * | 1962-03-16 | 1968-10-31 | Eiwa Denki Co Ltd | Circuit for testing a winding with an iron core for the presence of a short-circuit turn |
GB2212927A (en) * | 1987-11-30 | 1989-08-02 | Plessey Co Plc | Testing coils |
GB2212927B (en) * | 1987-11-30 | 1991-12-04 | Plessey Co Plc | Test method and test apparatus |
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