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### Why diode is non ohmic semiconductor device?

Started Feb 3

Why diode is non ohmic semiconductor device?Continue

### What is ideality factor of diode

Started Feb 3

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

## Latest Activity

Oct 14
Oct 8
Satyadev Vyas posted a blog post

### What is knee point or cut-in voltage of PN junction

The minimum amount of voltage required for conducting the diode is called knee voltage and it is also known as cut-in voltage. before knee voltage diode behave like a high resistor(means it’s not conduct).knee voltage is different for different elements for e.g for Si knee voltage is 0.7v, knee voltage is Ge 0.3v. To know more about knee or cut-in voltage, you may read below article.Read More:…See More
Sep 9
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Jun 15
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
Electrical and instrumentation
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### At start what is the slip of induction motor?

Posted on October 14, 2020 at 5:30am

At start, slip of the motor is unity.

When the motor starts accelerating, the slip decreases and at the rated KW the slip of the motor is about 3–5 % of the synchronous speed of IM.…

Continue

### Harmonics Filters – Cost and Effectiveness

Posted on October 14, 2020 at 5:29am

The main characteristic of an electrical system is its waveform which, under all operating conditions and load conditions, must always remain a pure sine wave. Factors altering this sinusoidal wave shape can be said to be affecting the power quality within the electrical system.

The level of harmonics in present day electrical network is steadily increasing due to the introduction of energy efficient…

Continue

### Harmonics Filters – Cost and Effectiveness

Posted on October 14, 2020 at 5:29am

The main characteristic of an electrical system is its waveform which, under all operating conditions and load conditions, must always remain a pure sine wave. Factors altering this sinusoidal wave shape can be said to be affecting the power quality within the electrical system.

The level of harmonics in present day electrical network is steadily increasing due to the introduction of energy efficient…

Continue

### Role of test and measuring instruments in harmonics studies

Posted on October 13, 2020 at 6:01am

Now a days, latest state of art measuring equipments are available which measures the power quality accurately and analyzing tools are also available. Whenever, load structure is changed there is need to study the quality of power system. Remember, analysis of power quality is not a one-time job. Whenever a new nonlinear load is added to electrical network one should conduct the study on harmonics and reallocation of the power factor capacitors must be done if…

Continue

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At 12:30am on April 20, 2019, Obakore Jude Oloya said…
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At 10:41am on March 13, 2019, Joy said…

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