Satyadev Vyas
  • Chittorgarh, Rajasthan
  • India
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Why diode is non ohmic semiconductor device?

Started Feb 3 0 Replies

Why diode is non ohmic semiconductor device?Continue

What is ideality factor of diode

Started Feb 3 0 Replies

on what factors the ideality factor of the diode depends?Continue

 

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Why induction motor is called asynchronous motor?

The induction motor function if there exist slip between the synchronous speed and the actual speed of the rotor. The rotating magnetic field rotates at the synchronous speed in the air gap, however the flux that links to the rotor conductor has less speed than synchronous speed, The difference between the speed is called slip.The slip cause current to flow in the rotor conductor and as a result torque is produced. That is why an induction motor is called asynchronous ( a= Not, Synchronous= Not…See More
Apr 24
Satyadev Vyas posted a blog post

Why CT secondary should not be left open?

During normal operation of CT, the primary and secondary winding produces mmf which by lenze’s law opposes each other. As the secondary mmf is slightly less than the primary mmf, the net mmf is small. This net mmf is the working/magnetizing mmf of the core of CT.Now, in case secondary winding is kept open, then secondary current will be zero while the primary current of CT will remain same. Therefore the opposing mmf of secondary will no longer exist. Hence the net mmf is due to primary current…See More
Apr 20
Satyadev Vyas posted a blog post

How to check BDV of transformer oil?

The sample is taken out from the transformer tank and the BDV of the oil is checked by BDV tester. The BDV tester is basically a high voltage unit and the voltage can be regulated from 0–70 KV. The tester has two electrodes separated by 2.5 mm distance( 4.00 mm separation units are also available).Test Procedure:Collect the oil sample of transformer oil from the bottom valve of the transformerPour the oil sample in oil pot of the machine.Keep the oil pot in open air for 5 Minutes so that air…See More
Apr 13
Satyadev Vyas posted a blog post

How to calculate ISF of current transformer?

How to Calculate ISF of CT? Step 1 Calculate the fault current of the network for which CTs are to be installed. The fault current of the network depends on the installed capacity in MVA and percentage impedance of the electrical network. Assume symmetrical fault current of the electrical network is 20 kA. Step 2 Select CTR of current transformer for…See More
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Profile Information

Company
Birla Corporation Limited
Job Title
General Manager(E&I)
Industry
Cement
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Electrical and instrumentation
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Satyadev Vyas's Blog

Why can a 50Hz CT work on 60Hz systems, and why can't a 60Hz C.T. work on a 50 Hz system?

Posted on August 12, 2020 at 10:56pm 0 Comments

CT or PT functions on the principle of electromagnetic induction. The electrical energy is first converted into magnetic energy and again the magnetic energy is converted in the electrical energy. The electrical current first converted in magnetic energy. The magnetic energy is nothing but converting electrical current into flux. The flux then flow through the core. The core of the CT or PT has its maximum flux carring capacity.…

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What is Battery Acid?

Posted on August 12, 2020 at 9:57pm 0 Comments

In general battery acid refers to the electrolyte in a lead acid battery. That is a diluted form of sulfuric acid (H2SO4) in water generally in the concentration of 36–40%. As such it does not have the burning properties of concentrated sulfuric acid.

Battery acid is rather unique in battery electrochemical systems because it not only carries ionic…

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What is insulation class of transformer oil?

Posted on August 7, 2020 at 11:31pm 0 Comments

The insulation class of the transformer refers to the max (hot spot) temperature that can be safely withstood by the specific insulation material. It is the weakest of the materials used in transformer (as far as temperature withstand capability is concerned) as the other materials like steel core & copper winding can withstand much higher temperature during operation. There are different classes of insulation materials (Y, A, B, F, H & C) with max temperatures 90, 105, 130,…

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The terminal voltage is less than the EMF of a cell or a train of cells. The cell voltage is the voltage available at the terminals of the battery. This is equal to EMF - Voltage drop(s)due to intern…

Posted on August 7, 2020 at 11:23pm 0 Comments

  • The terminal voltage is less than the EMF of a cell or a train of cells. The cell voltage is the voltage available at the terminals of the battery. This is equal to …
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At 12:30am on April 20, 2019, Obakore Jude Oloya said…
Hello
At 10:41am on March 13, 2019, Joy said…

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