Any sort of work which includes an exposure to electrical circuits and equipment involves its own set of risks. Particularly, electricians are exposed to these hazards on a regular basis. We commonly know that electric shock is the only danger electricians are exposed to, but little do we know that electric arc explosion is an equally perilous threat, which can generate blistering heat called arc flash that can cause lethal injuries. read more
These parameters are important to clarify our application design from voltage value,phases,full load ampere, overload setting and frequency setting if using Variable Speed Drive.
As an electrician,we must fully understand what is mean by voltage, ampere and frequency to ensure our application safe and working properly.
Ok…let we start our discussion and explanation about Voltage, Ampere and Frequency on Electric Motor Nameplate.
RATED VOLTAGE (VOLT)
What is Rated Voltage?For simple understanding, rated voltage is manufacturer design for suitable operated voltage value with optimal performance.We can refer the motor voltage and phases on the nameplate also can decide either voltage/phases is available in our installation or not.Every country have different value of voltage.Please make sure your motor are followed standard country voltage. Read More
This topics always discussed among of electrician personnel that involved on new installation or electrical projects.If they miss calculated or choose a wrong size for the conductor/wires,it’s can cause a big disaster when that installation failure.
Electrical cable/wire is a important things that we must consider with calculation and detail discussion to avoid any mistaken during design and installation.We must take a serious action to get a good result.
I would like to shared some general requirement for electrical cable/wire for new electrical installation or projects that we must consider during design review.I hope this can make a guide line for the best result in your installation or projects. read more
When we plan to install an electric motor for our application,the one of important parameter that we MUST verify is about VOLTAGE.Ensure the voltage is balance between phase to phase.
Motor voltages should be kept as close to the nameplate value as possible, with a maximum deviation of 5 %. Normally motors are designed to operate within 10% of nameplate voltage.
What happen if your voltage variations is large than nameplate voltage?The answer is if voltage variations larger than motor nameplate voltage,it’s can have several damage effects to the motor on torque, slip, current, efficiency,power factor, temperature, and service life. read more
Electrical shock is the major factor contribute to injury and more serious death statistic for electrical incident around the world.We can’t assume are is present or not because it is not visible and can look with naked eyes.
Electrical safety principle is to keep away person from live voltage.For electrical person,they need to clarify voltage value is safe or not before proceed any maintenance and repairing activity to avoid electrical shock using a multimeter.
To minimize the electrical shock incident,some country have the new standard and regulation for machine and power panel safety installation such as to install the Voltage Verification. read more
What is the excitation?The main purpose of excitation system for generator is to supply the power source to the rotor field coil.Excitation system produce the field current and it controlled by the automatic voltage regulator (AVR).I already discuss about automatic voltage regulator on my last post.
This field current controller is important to ensure the generator running in the suitable voltage.It also controlled the value of current when generator connected to a large load.It will receive or delivery the required level for reactive power ( kVAr). read more
Generator is the important power supply equipment to generated electricity.Without electricity,we cannot operated machinery,equipment,lighting,computer and others device for our living.
For general power supply,power distributor normally used the high capacity of generator to supply the electricity to the consumer.It different size for backup power supply that used for hospital,server room,critical equipment or important area.
I want share some information about types of generator and basic operation.Generators are generally classified in accordance with speed and construction.We can categories the generator with following types. read more