Answer / kj

An RTD is a resistance temperature detector. It works by
measuring the changing resistance of the element as the
temperature changes.
A thermocuople is a joint between two different metals whic
produce a voltage which changes with temperature.

Answer / tamjid

RTD is cheaper than thermocouple, and TC is more accurate than RTD, we use RTD for temp sensing bello 150C, but TC used for high temp sensing,

Why strting torqe high in inducation motor?

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specify the inbuilt protections in DG

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is there any phase difference occurs while primary and secondary side mutual induction occurs?

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how much excitation voltage required to generate 1mw power?

0 Answers   Saudi Oger,

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Whot is the braking capacity for MCCB. How we select different braking capacity.

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what is vfd?

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what is LT & HT?

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If a manufacturer decribes a power supply transformer as providing a secondary voltage of 24 volts when connected to a 240 volts supply, do you think they are refering to the full load or no load secondary voltage?

3 Answers  

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How many types of probe used in cro?

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We have 2 Nos. Transformer with the capacity of 2000KVA and 1250 KVA and currently using only one 2000KVA T/R during operational hours while non- operational hous 1250 KVA T/R also used to reduce T & D losses. Similarly, 2 capacitor bank of 500KVAR and 300 KVAR also installed to balance reactive power. Now problem is around 1000 KW load PF is not maintaning 0.99 as 350 KVAR capacitor is in healty condtion. Now the PF is maintain 0.95 to 0.96.

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My system is 22kv/3.3kv transformer. client is asking to use NGR, but as we have dedicated Neutral Earthing systems which has a value less than 1 Ohm. So i want solid comparision. Why i should not use NGR as my system is already protected.Can any one help me to get out of this.how should i reply on basis of some great comparision and calculations. Please help

2 Answers   Ariel,

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need to make a report. Need to choose a 3phase induction motor. Load conditions motor will operate in : Maximum Load: 30 Kw Speed: 2950 rpm Ambient temp: 20 cent Supply voltage: 440V Frequency: 50Hz need to look for the safety factor when choosing the motor, went through catalouge found a few, but dont know how to choose the safety factor allowing an extra load something above 30 KW to avoid any harm.

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