Answer / ashraf majid

Thyristor convertor type AVR(Automatic Voltage Regulator)
is made of Thyristors(Silicon Controlled Rectifiers,SCRs).
We know that output DC voltage from an SCR will not only
depend upon the r.m.s. value of Input voltage applied, but
also at the angle at which the input AC cycle is fired
(using gate signal). If the firing angle is zero(in a
simple circuit), then maximum DC output voltage will be
obtained.If the firing angle is changed from 0 to 180,then
maximum to minimum voltage is obtained. This property could
be used to build an AVR. The firing angle proportional to
Output voltage could be used to trigger the thyristor,in a
closed loop manner and a nearly constant DC voltage(Average
Value) can be obtained.An invertor circuitory could be
utilised to get a regulated AC supply.
Many other configurations can be build from thyristors to
get a regulated AC supply.

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Energy metering: On the property I am renting, the supply voltage is 2 x 110 volts. These 2 x phases enter a energy meter which then exit the meter to over head lines to my house. Question 1. The meter is single phase 240 volts but is being used as 2 x phase(2 x 110volt), is this acceptable? if not, please give me the reasons. The meter details are as follows: 60Hz 15amp Imax 100 amp Kd 3,6 Wh/R 1 fase 3 hilos Model FX 231. I think it was manufactured in Brasil From this meter, the cables run along over head aluminum conductors,I estimate the cross sectional area to be 25mm diameter, but the neutral is only about 10mm square diameter, which cover a distance of 170 meters and then terminate with an underground cable of 65 meter length, total length = 235 meters. There must be a huge voltage drop over this length. This line is protected with 2 x 200 amp aluminum fuses after the meter, there is no main switch in the distribution board. These 2 phases connect directly onto 2 busbars. Surely the neutral should be the same size as the conductors if not more? Question2. What are your thoughts about this installation, should there be better protection, is the neutral too small? During the night, the lights dim then brighten all the time, this cannot be good for my electrical appliances. In my home, I only have a small electric geyser and fridge, my stove works off gas. But when i use other appliances like the washing machine or microwave oven, the light dim. The internal wiring of this house is done with solid hard drawn copper wires and of course, they have to be under rated. I am a retired electrician by trade, but not on the metering and over head mains side, my experience is on the factory maintenance side of things. Your expertise on these matters will be greatly appreciated. Please inform me how to rectify or make any improvements Kind regards, my power bill is very expensive, so I need to know how to bring it lower. Kind regards, Brian

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Dear sir/mam Iwant complete details of Naintenence of 33kv/433v Transformer having 1250 KVa

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Why the output of OP-AMP is always less than Vcc?

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Merz-Price circulating current principles is more suitable for

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