Maimaitar Karamin Enerji Da Turonin Yadda Ake Tattara

A sani da ake magana a induction type energy meters, don ya shafi hanyoyi na hakuri mai girma da tattalin arziki, “Tara bayanin daga cikin voltage na takamawa voltage da flux na pressure coil yana iya zama 90o“. Amma a cikin halitta, tara bayanin daga cikin voltage na takamawa da flux na pressure coil ba 90o bane, amma goma sha'awa. Saboda haka, ana amfani da wasu jagorar lag adjustment devices don tsarin lag angle. Za a duba hoton da aka bayar:

A cikin hoton da aka bayar, muna fada wata coil wanda yake kan zuba ta masu turn N. Wannan coil shine lag coil. Idan an yi takamawa a pressure coil, za ta fara flux F. Daga nan, wannan flux yana zama abubuwa biyu, Fp da Fg, Fp flux yana kirkiro disc da ke girma, ko da lag coil. Saboda lag coil, za ta fara emf El wanda yake zama 90o a fili flux Fp, kuma Il yana zama 90o a fili El. Lag coil yana fara flux Fl. Flux na resulta da ke kirkiro disc shine kombinasiyar Fl da Fp. A nan, ma'anar wannan flux na resulta yana zama da mmf na resulta na lag ko shading coil, kuma mmf na shading coil zai iya canza ta hanyoyin biyu

1. Ta hanyoyin electrical resistance.

2. Ta hanyoyin shading bands.

Za a duba wannan abubuwa a fili:
(1) Tsarin resistance na coil:

Idan electrical resistance a cikin coil yana zama ɗaya, current yana zama ƙasance, saboda haka mmf na coil yana ƙasance, kuma lag angle yana ƙasance. Saboda haka, muna ƙara resistance, kuma resistance zai iya ƙara ta amfani da wire mai ƙasa a cikin coils. Don haka, ta hanyoyin electrical resistance muna iya canza lag angle.
(2) Ta hanyoyin shading bands a ƙarin da ƙasa a zuba ta masu central limb, muna iya canza lag angle saboda idan a ƙara shading bands ƙarin, suke gano flux da ƙarfi, saboda haka emf na resulta yana ƙarfi, kuma mmf yana ƙarfi da ƙarfin lag angle. Idan a ƙara shading bands ƙasa, za su ƙarfi flux, saboda haka emf na resulta yana ƙasance, kuma mmf yana ƙasance da ƙarfin lag angle. Don haka, ta hanyoyin ƙarin da ƙasa a shading bands, muna iya canza lag angle.

Canza Friction

Don canza friction forces, muna ƙara small force a ƙarin da disc ke girma. Wannan applied force yana da kyau ita ce load, saboda haka, meter zai iya karanta daidai a light load. Amma over compensation na friction zai ƙara creeping. Creeping shine continuous rotation na disc bayan an energize pressure coil inda current ba ake girma a current coil. Don canza creeping, za a ƙara biyu holes, wadanda suka ƙarin da ƙasa a disc. Saboda haka, circular eddy current path na disc yana zama, kuma center na effective eddy current paths yana ƙasa zuwa C1 daga C. A nan, C1 yana zama equivalent magnetic pole da eddy currents suka faɗa, saboda haka, net force na rotating disc, zai ƙara C1 ƙarin da ƙasa zuwa axis na pole C. Saboda haka, disc zai creep har zuwa lokacin da hole ya ƙara ƙarin da ƙasa a edge na pole, amma girman daɗi a disc zai ƙara da opposite torque wanda ake fara da wannan mechanism.

Canza Overload

A lokacin da disc ke girma, za ta fara emf wanda yake fara da rotation, wanda ake kira dynamically induced emf. Saboda hakan, eddy currents zai ƙarfi, wadanda suke ƙungiyar da series magnetic field don fara breaking torque. A nan, breaking torque yana da muhimmanci da square of current, saboda haka, yana ƙarfi da ƙarfin girman disc. Don canza production na wannan self breaking torque, full load speed na disc yana ƙasance, saboda haka, self breaking torque zai ƙasance. Errors a single phase energy meters: Errors da system (i.e. driving and braking) suka faɗa, suka rubuta cewa:

Error caused by Driving System

1. Error Due to Non SymmetricalMagnetic Circuit
   Idan magnetic circuit ba symmetrical bane, za ta fara driving torque, wanda zai ƙara meter creep.

2. Error Due to Wrong Phase Angle
   Idan ba a da proper phase difference a cikin various phasors, za ta ƙara improper rotation na disc. Improper phase angle shine due to improper lag adjustment, variation of resistance with temperature ko abnormal frequency of supply voltage.

3. Error Due to Wrong Magnitude of Fluxes
   Akawar reasons for wrong magnitude of fluxes, main reasons shine abnormal values of current and voltage.

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