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 [...]
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 [...]
Generally for electric motor size,it rated by horsepower (hp) or kilowatts (kW) unit.We can recognize the electric motor size when refer to their kilowatts or horsepower.So from power (kW/hp), how we can know the full load ampere for electric motor? This time i want share about how to calculated the full load ampere (FLA) of [...]
What is Vacuum circuit breaker? As we know vacuum mean the the pressure is maintained below atmospheric pressure( unit : mmHg ).So the manufacture made a research and development to design the vacuum circuit breaker based on current cannot jump in vacuum condition. This breaker used the vacuum pressured to extinguish the current arc when [...]
What is major criteria for proper electrical cable design? Cable is a important thing in electrical engineering to transfer the power supply from distribution to end user or equipment.It must have a quality and durability to ensure it can stand for any condition and long life span. Day by day,manufacture made the research and development [...]
NEC Calculations for overload relay. Sizing for overload is important to avoid serious damage for electrical application such as motor starter,machinery or others electrical equipment.According to NEC,the general requirement for overload sizing be set around 115% or 125% from full load ampere. For calculation of overload sizing,it depend on the motor full load ampere current [...]
What is UPS batteries charging rates? Basically charging rates for UPS batteries depend on type of batteries cell such as Lead-acid (Pb) or Nickel Cadmium (NiCd).This two types of batteries cell have a different method to charging up. For Lead-acid (Pb) cells is used a ‘constant voltage’ method.It mean where the current varies as the [...]
What is UPS batteries charger? When indicator for batteries level shown a it need to recharge,We must charge the batteries to ensure it in full capacity and can operate during power failure.But for UPS batteries charger it typically build in the UPS system. Now in market,it have several battery charger technology for AC and DC [...]
