GB398838A - Improvements in or relating to apparatus for measuring or indicating the power factor of an alternating current supply system - Google Patents
Improvements in or relating to apparatus for measuring or indicating the power factor of an alternating current supply systemInfo
- Publication number
- GB398838A GB398838A GB823032A GB823032A GB398838A GB 398838 A GB398838 A GB 398838A GB 823032 A GB823032 A GB 823032A GB 823032 A GB823032 A GB 823032A GB 398838 A GB398838 A GB 398838A
- Authority
- GB
- United Kingdom
- Prior art keywords
- voltage
- disc
- phase
- current
- shaped
- 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
- G01R25/00—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
Abstract
398,838. Power-factor measurements. ELLIOTT BROS. (LONDON), Ltd., Century Works, Lewisham, London, and SHOTTER, G. F., 14,' The Ridgeway, Friern Barnet, Middlesex. March 19, 1932, No. 8230. [Class 37.] Power-factor is measured or indicated by two electromagnet systems acting differentially on respective conducting elements mechanically connected, the rate of change of driving force of one electromagnet. system being different from that of the other for the same change in power-factor. One of the conducting elements is so shaped that its electromagnet system urges it more into or out of the field produced thereby. The magnet systems comprise current and voltage cores, the latter being provided with short-circuit rings or being energized through resistances, inductances or capacitances to produce a phase displacement of 90 degrees between two voltage fluxes. In a balanced three-phase system, the phase displacement is obtained by connection to different phases. A four-wire three-phase balanced system, Fig. 1, has voltage and current cores 3 .. 6 acting upon a circular rotor 1 and shaped rotor 2, the driving torque on disc 1 being proportional to the sine of the phase angle and that on disc 2 to the cosine. As the disc 1 rotates disc 2 into or out of the fields due to cores 4, 6 the torque on the shaped rotor varies until it balances that on disc 1 in which position power-factor is indicated. In a three-phase unbalanced system, two shaped rotors are employed, the series magnets being energized from two lines and the voltage magnets from midpoint tappings on autotransformers across two of the phases. A threephase four-wire unbalanced system has three shaped rotors, the current and voltage connections being made to all phases. In the threewire system the circular rotor is acted upon by two driving magnet systems and in the fourwire arrangement by three driving magnet systems. The electromagnet system acting on the shaped disc or discs may be duplicated to give increased control torque and readings at all power factors, the voltage core windings being connected in parallel and the current windings in series. Instead of employing common cores for the voltage and current magnets, they may be separated and employed in conjunction with disc rotors having central portions 52 cut away, Fig. 6, this arrangement preventing eddy current reaction between the magnet systems. The voltage pole tips may be provided with shading-rings 55. The circular rotor may have radial slots to prevent eddy current interaction. A single disc rotor may be employed to give torques depending on the sine and cosine functions. Drum rotors, or plates moved rectilinearly in guides may be employed. Instead of displacing the flux due to the voltage magnets, these may be connected to the same phase and the fluxes due to the currents displaced, or both fluxes may be relatively displaced. Specification 373,120 is referred to.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB823032A GB398838A (en) | 1932-03-19 | 1932-03-19 | Improvements in or relating to apparatus for measuring or indicating the power factor of an alternating current supply system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB823032A GB398838A (en) | 1932-03-19 | 1932-03-19 | Improvements in or relating to apparatus for measuring or indicating the power factor of an alternating current supply system |
Publications (1)
Publication Number | Publication Date |
---|---|
GB398838A true GB398838A (en) | 1933-09-19 |
Family
ID=9848451
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB823032A Expired GB398838A (en) | 1932-03-19 | 1932-03-19 | Improvements in or relating to apparatus for measuring or indicating the power factor of an alternating current supply system |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB398838A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2558609A (en) * | 1945-01-08 | 1951-06-26 | Northwestern Steel & Wire Co | Power factor sensitive relay |
-
1932
- 1932-03-19 GB GB823032A patent/GB398838A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2558609A (en) * | 1945-01-08 | 1951-06-26 | Northwestern Steel & Wire Co | Power factor sensitive relay |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US2090521A (en) | Accelerometer | |
GB398838A (en) | Improvements in or relating to apparatus for measuring or indicating the power factor of an alternating current supply system | |
US2349663A (en) | Torsional measuring device | |
US1646634A (en) | William frank sutherland | |
US2919406A (en) | Power measuring instrument | |
US604459A (en) | Electric meter | |
US1647332A (en) | Vector-sum volt-ampere meter | |
US2232525A (en) | Apparatus for measuring horsepower and energy | |
US1913260A (en) | Electric meter | |
US1745868A (en) | Electrical measuring instrument | |
US2531018A (en) | Electrical phase measuring instrument | |
US1537374A (en) | Electrical instrument | |
US614225A (en) | Electric meter | |
GB131405A (en) | Improvements in Apparatus for Measuring and Indicating an Electricity Supply. | |
US1929984A (en) | Meter movement | |
US745461A (en) | Alternating-current meter. | |
US941467A (en) | Alternating-current apparatus. | |
US2359129A (en) | Polyphase meter | |
US1651482A (en) | Electrical measuring instrument | |
US3052410A (en) | Measuring apparatus | |
US808532A (en) | Induction-meter. | |
US1588538A (en) | Electrical measuring instrument | |
GB136515A (en) | Improvements in and relating to the Measurement of Alternating Electric Current Power. | |
US2129537A (en) | Ampere-squared-hour meter | |
SU90156A1 (en) | Induction measuring device |