Electrical Engineering Centre

High voltage circuit breaker

lemau — Mon, 30 Jan 2012 14:00:31 +0000

Types of high voltage circuit breaker 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 [...]

Measuaring motor insulation using HI POT tester

lemau — Sat, 28 Jan 2012 04:45:43 +0000

What is HI-POT tester? When we need to evaluate 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 [...]

Star Delta wiring diagram

lemau — Wed, 18 Jan 2012 15:20:44 +0000

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 [...]

Current rating

lemau — Mon, 16 Jan 2012 14:52:19 +0000

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 [...]

Fault protection

lemau — Mon, 09 Jan 2012 13:47:34 +0000

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 [...]

Relay Characteristics

lemau — Sun, 08 Jan 2012 12:35:44 +0000

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, [...]

Types of Relay

lemau — Sat, 07 Jan 2012 07:24:17 +0000

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 [...]

How to protect from surge voltage?

lemau — Thu, 03 Nov 2011 13:04:32 +0000

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 [...]

Distribution substations

lemau — Tue, 01 Nov 2011 05:14:07 +0000

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 [...]

Definition of Surge voltage

lemau — Sat, 29 Oct 2011 23:08:43 +0000

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 [...]