Electrical Engineering Centre

Star Delta completed wiring diagram

The most active post in Electrical Engineering Centre blog is Star delta starter and Star Delta motor connection.I received many comments and request for Star Delta circuit diagram.

So this time i want share my simple star delta circuit diagram completed with power and control line circuit.I hope it can be as basic reference for all electrician about star delta starter diagram.

Star delta starter is a common used in domestic and industry sector to drive variant application such as chiller water pump,machinery,air-compressor and many more equipment. read more

Current Rating for cable sizing

Why current rating value is so important for cable sizing?This time i want share some information about current rating.It look like simple value but it give the big impact when we sizing the cable for our application.

If during cable sizing calculation not done in proper way,it can cause a serious damage for electric cable,equipment and human.It also can cause the waste of money when it over sizing and increase the budget for reworks.

That it current rating play a important role during cable sizing for electrical wiring job scopes.We can choose the right cable size read more

Basic terminology of electrical fault protection

A new terminology for electrical currents now include all faults those between live conductors as well as earth or grounding faults.

If we not design our circuit protection properly followed standard guide,it can cause serious injury or death for human and equipment damage.

Fault current be determined at every relevant point. For small and medium installations with LV utility supplies, this is satisfied by determination of the fault currents at the incoming power supply. read more

The Range of Relay Characteristics

Relay manufactures design them for special applications to full fill industries needed and coupe with advanced technologies. This time i want share information about relays characteristics most often used in typical automation and instrumentation work.

As i explained in my last posted,basically principal for small DC and AC relays,sensitive relays, miniature and sealed relays, and some small power relays is common. read more

Relay Introduction

In automation industries,relay is a common device used for control application.Basic operation of  electrical relay is a device that changes the state of a circuit in response to it being energized or de-energized by that or another circuit.

It function to open or close the circuit or contact and respond depend on signal that we gave it to the magnetic coil.It have normally open and normally close contact that we can choose when design the control circuit for our application.For generally understanding,relay also may consider as a amplifier and controller. read more

How to protect equipment from surge voltage?

Each year many electrical equipments defected due to surge voltage from natural disaster like lightning or supply error.It very costly to replaced it back to normal system.

Theoretically single lightning strike produce 20,000 to 40,000 Ampere and about 200 Mega volts (MV) .It enough to generated a temperature about 4 times hotter than the surface of the sun.

In the market,some of surge protectors are designed to cut out  if a surge value exceeds 60,000 ampere to protected the sensitive equipment from defected. read more

What is distribution substations?

For electrical power distribution,substation is the one important component to serve,distributing and regulated an electricity to building,factory or private living area.

Normally substations have the several required equipment such as power transformers and the voltage-regulating device for converting the high incoming sub-transmission voltages to low voltage primary system and ensure it in specified voltage tolerances.

The others basic equipment in substations includes circuit breakers, switches, bus bars, shunt coil reactor, power factor correction capacitors, lightning arresters, read more

What is surge voltage?

For our easy understanding,electrical surge is a sudden high pick out of voltage value in the system.It can happened in electrical power distribution and communications lines entering homes,factory, offices, and other facilities.

The surges voltage happened due to natural factor such as lighting or human error.It can effected and can cause serious damage for any unprotected electronic device that connected to the power or communication lines.

Electronic products that are especially vulnerable to surges include microprocessors or micro controllers, such as computers, TV, server system, cordless telephones, and inverter. read more