What is overvoltage: A sudden rise in voltage for a short duration on the power system is known as overvoltage or voltage surge. Overvoltage is always temporary that exist for short period but that may cause damage to the power system due to surge in voltages. There are many causes for occurrence of overvoltage condition,… Read More: Overvoltage Protection Due to Lightning and Switching »
MCC Panel factory acceptance test is the mandatory requirements that every supplier will make sure before delivery at the project site. FAT or factory acceptance test witnessing by consultant or client is also pre-requisite in order to avoid any complications or rejections at later stage. Sometimes if FAT is not possible due to any reason… Read More: Method Statement for Motor Control Center MCC Panel Installation »
In one of our previous post we mentioned details about the variable frequency drives principle. Now this page provides you the method of testing and commissioning of VFD drives in simple steps. Remember before testing all installation and construction completion should be approved. Power Connection Requirements: Megger the incoming and outgoing power cable & connections for… Read More: Method Statement for Variable Frequency Drives VFD Testing and Commissioning »
Cable sizing is done based on three parameters: Load current, Short circuit current carrying capacity, Voltage drop. Below are given simple steps for performing cable sizing calculations. Step 1 – Calculate Load Current: Calculate the load current from the load data available. Formula is: I=Load (in kW)/(sqrt(3)V(in kV)p.f) (A) The current obtained has to derated… Read More: Cable Sizing & Voltage Drop Calculations Formula »
As a standard practice installer or contractor shall arrange for the witnessing of the following tests on the fully equipped switchboards (main, submain distribution boards and Motor Control Centers MCC) including primary bus bars and connections at the factory, in accordance with IEC 439-1: High voltage power frequency tests on main and auxiliary circuits Dielectric/insulation… Read More: Standard Checks & Tests for MDB, SMDB, DB & Motor… »