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UKAWA Wamponda Samuel Sitta Kumwachia Mkewe jimbo
MSAFARA wa mgombea mwenza wa urais kupitia Chadema chini ya mwamvuli wa Umoja wa Katiba ya Wananchi (Ukawa), Juma Duni Haji, juzi uliingia katika Jimbo la Urambo mkoani Tabora, huku makada wa umoja...
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Aunt Ezekiel: Nimeamua Kuhama CHADEMA Na Kurudi CCM Baada ya Kuvutiwa na Sera...
MWIGIZAJI mahiri wa filamu nchini, Aunt Ezekiel, amedai kutishiwa amani baada ya kufanya maamuzi yake kisiasa ambapo amehamisha ushabiki wake kutoka CHADEMA na kwenda CCM. Licha ya mrembo huyo kudai...
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Wakenya Watatu Na Mtanzania Mmoja Wauawa kwa Ujambazi Arusha
Majambazi wane, wakiwemo raia watatu wa Kenya wameuwa na polisi mkoani Arusha baada ya kuhusika kufanya matukio mbalimbali ya ujambazi wa kupora silaha pamoja na fedha. Akizungumza na waandishi wa...
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Wizara ya Afyayanzibar Yakabidhiwa Pikipiki Tano kwa Ajili ya Wakuu wa...
Mwakilishi wa Shirika la Kuhudumia Watoto (Save The Children) Bi Mali lisson, akitowa maelezo kabla ya kukabidhi Pikipiki kwa Wakuu wa Kitengo cha Mkono kwa Mkono wakati wa hafla hiyo iliofanyika...
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Design Principles of Substation Grounding System
The most important factor in the substation is the grounding. The system neutral is connected to the ground through grounding. The discharge path for surge arrestors and safety of operating personnels...
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Voltage Transformer Earthing
In this system of earthing, the neutral point is earthed through a single phase voltage transformer. The system thus acts as an insulated neutral system. Avery high reactance earthing is provided due...
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Resonant Grounding
This system is also referred as arc suppression coil grounding. In the previous earthing methods that we have discussed the earth fault on any one of the phases caused total shut down of the system....
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Resistance Earthing
In the cases where it is necessary to limit the fault current then the current limiting element must be inserted in the neutral and earth. One of the ways of achieving this is the use of resistance...
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Solid Grounding
In this method of earthing, natural is directly connected to earth by a metallic connection or a wire of negligible resistance and reactance. The charging currents flows through the system under...
View ArticleEarthed Neutral System
In this system, the neutral is earthed either directly or through resistance or reactance depending on the requirement. Thus the system neutral can be grounded effectively or non-effectively. In...
View ArticleHigh Frequency Transformer
The lamination thicknesses, beyond the normal power frequency range at frequencies higher than 50-60 Hz, have to be reduced control the iron losses to an acceptable level. If the operating frequencies...
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Three winding Transformers
1.1 Introduction In addition to primary and secondary windings, the transformers may be constructed with the third winding. This winding is called tertiary winding. The normal two winding...
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Phase Shift Transformer
In this type of transformer, a laminated silicon steel stator consisting of either two phase or three phase winding similar to that in case of induction motor. A typical drysdale phase shifting...
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Isolation Transformers
All the transformers are basically isolation transformers as they provide electrical isolation between primary circuit and secondary circuit. But most of them either step up or step down the voltage...
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M.M.F. Method of Determining Regulation
This method of determining the regulation of an alternator is also called Ampere-turn method or Rothert’s M.M.F. method. The method is based on the results of open circuit test and short circuit test...
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Ferrodynamic Instruments
The ferrodynamic type instruments are same as the electrodynamic type instruments. The main difference is that the ferrodynamic type instruments consists a magnetic circuit of soft magnetic steel....
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Sensitivity of Voltmeters
In a multirange voltmeter, the ratio of the total resistance R T to the voltage range remains same. This ratio is nothing but the reciprocal of the full scale deflection current of the meter i.e....
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Multirange Voltmeter
The range of the basic d.c. voltmeter can be extended by using number of multipliers and a selector switch. Such a meter is called multirange voltmeter and is shown in the Fig. 1. Fig.1 multirange...
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Basic D.C. Voltmeter
The basic d.c. voltmeter is nothing but a PMMC D’Arsonoval galvanometer. The resistance is required to be connected in series with the basic meter to use it as a voltmeter. This series resistance is...
View ArticleRequirements of a Shunt
1) The temperature coefficient of shunt and the meter should be low and should be as equal as possible. 2) The shunt resistance should be stable and constant with time. 3) The shunt resistance should...
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