Me ke nanuwa da Power Factor Meters?

Misali mai wani abubuwa na Power Factor Meters?

Takaitaccen misali mai wani abubuwa na power factor meter

Power factor meters suna cikin wurare da suke amfani da su don inganta shiga daidai masu iya kawo shiga a wurare AC, kuma ana bukata su a fannin aiki.

Nau'in electric dynamometer

Wannan nau'in misali ya yi shiga da idan bayanai (coil ta resistance da coil ta inductor) don neman farkon tsarin voltage da current.

Yanzu an gaba pressure coil zuwa biyu, babbar tana cikin induction, maimakonar tana cikin resistance, kamar yadda aka nuna a kan resistor da inductor. Yanzu an rarrabe reference plane da Angle A a kan coil 1. Angle daga coil 1 zuwa coil 2 tana 90o. 

Saboda haka, coil 2 ya faru Angle (90o+ A) don bude reference plane. Scale na instrument an saukar da shi daidai, kamar yadda aka nuna a cikin hoton, don cosine value na Angle A. Zan iya sanya resistance ta coil 1 R da inductor ta coil 2 L. Yanzu, a lokacin nan shiga power factor, zaka iya haɗa canza R da L har zuwa R = wL don cewa abubuwan coil 2 ke da adadin current da ba daidai. Saboda haka, current ta coil 2 ta fi 90o tare da current ta coil 1 saboda inda coil 2 tana da inda mai karfi a kan nature.

Don samun deflection torque a wannan power factor meter, muna tabbatar da cewa akwai biyu deflection torques: wanda a kan coil 1 da wanda a kan coil 2. Coil windings suna gudanar da cewa waɗannan torques ke ciki, suna balanci Pointers idan suke daidai. Mathematical expression na deflection torque na coil 1 shine:

Principle na aiki

Principle na aiki na instrument shine balanci deflection torque na coil, kuma deflection angle ya nuna phase angle.

Mafi kyau

• Saboda amfani da iron components ita ce mafi yawa da loss ita ce mafi yawa, error a small frequency range tana ƙara da moving iron type instrument.

• Torque masu mafi kyau shine weight ratio.

Abin da ba a da shi ba

• Aiki mai yawa da moving iron instruments.

• Scale ba ta ci gaba 360o ba.

• Calibration na electric dynamometer type instrument ya ƙarfin da variation na voltage frequency na power supply.

• Sun zaɓi da wasu tools.