Dalilin Zafi a Kirki na Makina Sihensu

Masu kungiyar SCR (Short Circuit Ratio) na makina mai sanyi

Masu kungiyar SCR (Short Circuit Ratio) na makina mai sanyi yana nufin masu kungiyar bayan darajar da ita ce don gina tsari masu shaida a lokacin da ba ya shaida ba zuwa darajar da ita ce don gina adadin amfani a lokacin da ya shaida. Don makina mai sanyi na tatu fasa, za a iya koyar da masu kungiyar SCR daga Characteristic ta Open-Circuit (O.C.C) a wata shaida da Characteristic ta Short-Circuit (S.C.C), kamar yadda aka bayyana a wannan takarda:

Daga wannan takarda, ana bayyana masu kungiyar SCR a cikin mahauci.

Saboda haka, amsa Oab da Ode suna da mahimmanci. Saboda haka,

Direct Axis Synchronous Reactance (Xd)

Direct axis synchronous reactance X_d yana nufin masu kungiyar bayan tsari masu shaida da take faruwa da kan adadin amfani a lokacin da ya shaida a cikin yanayi na field current da ke sama.

Don adadin field current na Oa, direct axis synchronous reactance (a ohms) yana nuna a cikin mahauci:

Rashin SCR da Synchronous Reactance

Daga mahauci (7), yana bayyana cewa masu kungiyar SCR (Short Circuit Ratio) yana da rashin reciprocal da per-unit direct axis synchronous reactance X_d. A cikin yanayi na magnetic circuit mai satoci, darajinsu na X_d yana da muhimmanci a kan darajinsu na magnetic saturation.

Mahimmancin Masu Kungiyar SCR (Short Circuit Ratio)

Masu kungiyar SCR yana da muhimmanci wajen makina mai sanyi, tana taimakawa wajen rashin amfani, girman abinci, da kuma rukuni. Muhimman muhimmiyar su ne:

• Muhimmancin Regulation ga Tsari

• Girmanai masu SCR na duka suke tafiya tsarin terminal voltage a lokacin da mutane suka badala. Don inganta tsari masu shaida yana bukatar sakamako da field current I_f).

• Muhimmancin Rashin Yakin Da Ba Su Farko

• SCR na duka tana rage synchronizing power, wanda yana da muhimmanci wajen inganta yakin da ba su farko. Wannan tana rage muhimmin yakin da ba su farko, cewa makina da SCR na duka ba su da yakin da ba su farko a lokacin da suke amfani da wasu makina masu sanyi.

• Tsarin Sakamako

• Makina da SCR na musamman suna taimaka wajen regulation ga tsari da kuma yakin da ba su farko, amma suke rage fault current na armature short-circuit. Da kuma suke taimaka girman abinci da rukuni saboda tsarin sakamako.

Excitation voltage na makina mai sanyi yana bayyana a cikin mahauci:

Don adadin Tph Excitation voltage yana da rashin proportional da flux na field per pole.

Synchronous inductance yana nuna a cikin mahauci:

Rashin SCR da Air Gap

Saboda haka, masu kungiyar SCR (Short Circuit Ratio) yana da rashin proportional da air gap reluctance ko air gap length. Zama air gap length yana zama SCR, amma wannan yana bukatar field magnetomotive force (MMF) na musamman don inganta excitation voltage (Ef). Don zama field MMF, ya kamata a zama adadin field current ko kuma adadin field turns, wanda yana bukatar field poles masu kyau da kuma machine diameter masu kyau.

Tushen Tsarin Makina

Wannan tana rage tushen da SCR na musamman yana rage girman abinci, weight, da kuma rukuni na makina mai sanyi.

Adadin SCR Masu Yawan Abinci na Makina

• Cylindrical Rotor Machines: SCR yana zama daga 0.5 zuwa 0.9.

• Salient-Pole Machines: SCR yana zama daga 1.0 zuwa 1.5.

• Synchronous Compensators: SCR yana zama 0.4.

Wadannan adadin yana nuna tsarin sakamako bayan yakin da ba su farko, regulation ga tsari, da kuma girman abinci a cikin wasu configurations na makina mai sanyi.