Basic Electrical Engineering: 2015

Saturday, 7 November 2015

causes of low power factor

Electrical starter animation and working principle

Electrical formula converter and solved problems

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Wednesday, 14 October 2015

what are applications of shunt release in circuit breaker

what are applications of shunt release in circuit breaker.

A shunt trip device is an optional accessory in a circuit breaker that mechanically trips the breaker when power is applied to the shunt trip terminals. The power for the shunt trip does not come from within the breaker, so it must be supplied from an external source

Shunt trip circuit diagram.

shunt trip coil

A shunt-trip coil is a built-in component of a shunt-trip circuit breaker. It is a magnetic coil that can be energized externally to make the breaker trip to shut off the flow of current.

What are the application of Under voltage release

Under voltage release

Under voltage release provides tripping the circuit breaker if the input voltage (phase or line) drops below 70% of the rated value. Also, it prevents the circuit breaker from closure if the voltage is below 85% of the rated value. The main purpose of the under voltage release is to de-energize electric equipment in case of impermissible reduction of voltage. Also, the release can be used as shunt release if a push button (NC) is connected in series with the circuit controlling the release. On short opening of the push-button contacts the release will trip the circuit breaker.

Under voltage relay

A relay that has contacts that operate when the voltage drops below a set voltage. Under voltage relays are used for protection against voltage drops, to detect short-circuit faults,and more.

Under voltage coil

An Under Voltage coil is used to remotely trip a circuit breaker and some switch dis connectors.
An Under Voltage coil has to have a voltage applied to it to enable the device to close, and have the supply removed from it to trip the device.
An example of an application for an Under Voltage coil would be for emergency stop or load shedding.

proof of 1 hp = 746 watts

Proof of 1 hp equal to 746 watts

HP = Horsepower

HP and Watts are both units of power. Power can be electric or mechanical, and can be converted between the two. Any conversion will be less than 100 % efficient.

It is only for historic reasons that electrical power is measured in Watts not hp, like the way that tyre widths are in mm but rim diameter are in inches.

One pound is 4.44822 Newtons

so 550 foot pounds per seconds, converted to metric, is 550 x 0.3048 x 4.44822 Newton meters per second, which is 745.7 Newton meters per second, better known as Watts.

One foot is 0.3048 metres

1HP = 550 Foot Pound per second

1 Pound = 4.44822 Newtons

1 Foot is 0.3048 Meters.

1 HP = 550 * 4.44822 * 0.3048 meters

1Hp = 745.69 Newton meter per second.

A 1 hp motor cannot use less than 745.7 Watts so if it uses 1 kW it is about 75% efficient, which sounds about right for a motor of that size.

One mechanical horsepower of 550 foot-pounds per second is equivalent to 745.7 watts.

* A metric horsepower of 75 kgf-m per second is equivalent to 735.499 watts.

* A boiler horsepower is used for rating steam boilers and is equivalent to 34.5 pounds of water evaporated per hour at 212 degrees Fahrenheit, or 9,809.5 watts.

* One horsepower for rating electric motors is equal to 746 watts.

* A Pferdestärke is a name for a group of similar power measurements used in Germany around the end of the 19th century, all of about one metric horsepower in size.

* An RAC horsepower or British tax horsepower is an estimate based on several engine dimensions.

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how to calculate single phase transformers primary and secondary full load current

how to calculate single phase transformer full load secondary current

how to calculate single phase transformer full load primary current

define faraday's law of electromagnetic flux

define electrical transformer

How to calculate motor efficiency when known motor output energy in joule

how to convert kw to watts - electrical formulas

how to convert kw to watts

click here to watch how to convert kilowatts to watts.

1. how to calculate single phase transformer secondary full load current

2. how to work earth leakage circuit breaker -ELCB

3. faraday's law of electromagnetism

Tuesday, 13 October 2015

how to search image in google

How to search by image in google.

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Wednesday, 26 August 2015

Earth Leakage Circuit Breaker - ELCB

Earth leakage circuit breaker - ELCB

Click here to watch this video.

1. how to calculate single phase transformer secondary full load current

2. how to work earth leakage circuit breaker -ELCB

3. faraday's law of electromagnetism

Tuesday, 9 June 2015

how to calculate single phase transformers primary and secondary full load current

How to calculate single phase transformer primary and secondary full load current

Watch this video.

1. how to calculate single phase transformer secondary full load current

2. how to work earth leakage circuit breaker -ELCB

3. faraday's law of electromagnetism

how to calculate single phase transformer full load secondary current

How to convert single phase transformer full load secondary current

watch this video.

1. how to calculate single phase transformer secondary full load current

2. how to work earth leakage circuit breaker -ELCB

3. faraday's law of electromagnetism

Sunday, 7 June 2015

define faraday's law of electromagnetic flux

Define faraday's law of electromagnetic flux

Faraday's law of electromagnetic

a law stating that when the magnetic flux linking a circuit changes, an electromotive force is induced in the circuit proportional to the rate of change of the flux linkage.

1. how to calculate single phase transformer secondary full load current

2. how to work earth leakage circuit breaker -ELCB

3. faraday's law of electromagnetism

define electrical transformer

Define electrical transformer

Transformer definition

A device used to transfer electrical energy from one circuit to another. With an alternating current, a transformer will either raise or lower the voltage as it makes the transfer.

Definition image.