Why We Perform A VLF Test?
ATE has provided a very good reasons on this article why high voltage withstand tests on cables are necessary. Past practices involved HVDC Hi-pot or DC leakage current methods. They …
IEEE 399 – Recommended Practice for Industrial and Commercial Power Systems Analysis
IEEE 399 is commonly known as the Brown Book in the Color Book series. The Brown Book supplements the rest of the color book series. Its practical and general treatment …
Tools not provided
Some companies do not always provide you with tools required to complete your task quickly and efficiently. I do not truly understand this company philosophy. Even if they will provide …
Circuit Breaker Utilization Categories (IEC 60947-2)
Utilization category (for a switching device or a fuse) is defined in IEC 60947-1 as the combination of specified requirements related to the conditions in which the switching device or …
System Voltage Classes (ANSI)
In ANSI C84.1-2011, Clause 3, system voltage classes were explained Low Voltage (LV) A class of nominal system voltages 1000 volts or less. Medium Voltage (MV) A class of nominal …
Inverter Topologies – Variable Speed Drives
Voltage-source inverter has a configuration where rate of change of voltage (dv/dt) in the inverter is limited by a large capacitor connected in parallel across the DC link. Current-source inverter …