Electrical Engineering Centre

As we know about circuit breaker is to protect electrical equipment from abnormal condition such as over load current or short circuit.For Low voltage circuit breaker,i already explain on my last post.Please read my post about miniature circuit breaker (MCB),molded case circuit breaker (MCCB) and residual current circuit breaker (RCCB) for more detail information.

For high voltage circuit breaker,the main contact mechanism normally designed with various method to avoid from damage and provide a better quenching around the contacts surface.The main purpose is to extinguishing any arcs formed as faster as possible. read more

When we need to evaluate the motor condition,HI-POT tester or High Potential tester is the common equipment are used.As we know,a multimeter or ohm meter reading only can determine if a motor winding is open or shorted but cannot checked winding insulation condition if shorted with ground or phase.

The main purpose of the Hi Pot tester is to verify the quality and integrity of the electric motor insulation materials used on the armature or stator and also safe to using it without any defect.

Sometime we not take a serious attention or not know about it to checked winding insulation.This step is important to ensure motor can running in good condition without any breakdown. read more

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

Why current rating value is so important for cable/wire sizing?This time i want share some information about cable rating.It look like simple value but it give the big impact when we not do the proper sizing to 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

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

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.

To get a suitable relay for our application,we should understand about basic relay characteristic and general specification about operation and relay design because manufacture designs many types of relay for different application.

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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.It only a small device in automation circuit but it have important roles to make our system running accordingly. read more