Satyadev Vyas
  • Chittorgarh, Rajasthan
  • India
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Satyadev Vyas's Discussions

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

 

Satyadev Vyas's Page

Latest Activity

Satyadev Vyas posted blog posts
Jun 15
Satyadev Vyas posted blog posts
Jun 12
Satyadev Vyas posted a blog post

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

What is dispersion coefficient of induction motor?

Posted on June 15, 2020 at 5:30am 0 Comments

The dispersion coefficient is defined as the ratio of magnetizing current to ideal short circuit current. 34. What is the condition for obtaining the maximum torque in case of 3 phase induction motor? The maximum torque occurs in induction motor when rotor reactance is equal to rotor resistance.



Read More:… Continue

What is dispersion coefficient of induction motor?

Posted on June 15, 2020 at 5:30am 0 Comments

The dispersion coefficient is defined as the ratio of magnetizing current to ideal short circuit current. 34. What is the condition for obtaining the maximum torque in case of 3 phase induction motor? The maximum torque occurs in induction motor when rotor reactance is equal to rotor resistance.



Read More:… Continue

What are Triplen Harmonics?

Posted on June 15, 2020 at 5:27am 0 Comments

Lower order harmonics are of more concern than higher order harmonics. Harmonics by default refers to current harmonics. The impedance of the device or circuit is mostly inductive and so is equal to R+jwL, where w=2*pi*f. Hence it can be observed from the equation that the impedance offered is directly proportional to frequency. The frequency of the 3rd order is 3w, 5th order is 5w ... Hence as the order of the harmonics increases, the impedance offered to them increases and so they are less in… Continue

CT Knee Point Voltage Calculation Method

Posted on June 12, 2020 at 3:49am 0 Comments

Test Procedure for knee point Voltage calculation of CT :



1.Disconnect the CT from all external connection

2.Note down the knee point voltage of CT ( as per datasheet of the CT).

3. Apply 5-10 % voltage of the knee point voltage to the secondary of the

CT by auto-transformer. Note down the secondary current.

4.Increase the voltage gradually to 20,30,40,50,60,70,80,90 % of the

rated knee point of the CT and note down the secondary current.

5. Now increase… Continue

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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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