Why we use 4-20 mA Analog signal for the PLC input? Why not 0-20 mA? Why not 5-25 mA?

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In tranformer winding Connection Like Dyn1 ,so LV lags Hv by 30 deg and Dyn11 LV lead HV by 30,so how do this lagging and leading afffect the transformer??

2 Answers   Siemens,

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In a power conditoining unit (inverter) of a solar plant when we measure the d.c. current fed by different strings of solar plates to inverter, the current in the negative wire is less almost by 1 ampere to the current in its positive wire say current in positive wire 5 A , then current in negative wire of the same string is 4 A. Since the current entering should be equal to current leaving then why the current is noticably less in negative wire.

0 Answers  

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what is a pulse transformer? how rise time of pulse changes when ever the voltage changes?

0 Answers  

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How much DC or AC Current that a Human Body withstand for Electrical Shocks?

4 Answers   Suzlon,

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how can we change the phase angle b/w two phase?

2 Answers  

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What is the full name of one of choke less lamp BLL

2 Answers  

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why we use crushed stone in switch yard?

3 Answers  

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if u have single phase load (un balance) and the main power cable is 3.5core means netural is .5 of phase and can the three phase current make the return paht in .5 neutral.

1 Answers  

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At 765Kv, I have seen the use of PT at line side for metering and CVT for protection, although as far as my knowledge is concern, PT at this voltage level will have huge loss and more cost as compared to CVT as CVT can also perform same function of Protection and Metering? So my question is why use PT and not CVT for metering and protection in order to reduce the cost.

1 Answers  

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how to select the cable size? any formula to calculate cable size?

4 Answers  

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Which types of gate insttaled in static switch. Please give me answer.

0 Answers   cpgn,

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