Learn Electrical Engineering
In this article, we will discuss the electrical faults that normally occur in a power system. A short-circuit fault means the connection between two conductive parts of the system through a low-impedance path, where these two parts are at different voltage levels. Due to the low impedance of the path, as well as the voltage … Read more
The primary objective of a power system protection scheme is to isolate only the faulty section of the network while keeping the healthy portions in service. This approach improves system reliability and ensures continuity of power supply to consumers. Whenever a fault occurs in any part of a power system, it is desirable to disconnect … Read more
Test your knowledge with MCQ on Vacuum Circuit Breaker (VCB). Practice objective questions on VCB operation, construction, arc extinction, applications, and protection systems. Video on Vacuum Arc
An electrical power system often suffers from different abnormal conditions. For examples, it may suffer from short circuit faults. The system may go through the overloading conditions. There may be insulation failures. Lightning surges may strike on the system. We call these abnormal conditions together as electrical faults. Any these faults can damage electrical equipment … Read more
We perform this test according to IEC 62271-203 and IEC 60060. For a GIS, the basic insulation level generally corresponds to, 33 kV System Item Typical IEC Value Rated voltage 36 kV Power frequency withstand voltage 70 kV rms Lightning impulse withstand voltage 170 kV peak Switching impulse withstand voltage Not applicable 132 kV System … Read more
Thermally permissible short-circuit current calculation of EHV cable conductor and metallic sheath according to IEC 60949.
The thermal withstand capability of a power cable during short-circuit conditions is one of the most important design considerations. During a fault, an extremely high current flows through the conductor and metallic sheath of the cable for a short duration. This fault current produces intense heat. If the temperature exceeds the permissible thermal limit, permanent … Read more
Calculate resistor values instantly! Support for 4, 5 & 6 band resistors with real-time visual display. Easy color selection, tolerance & accuracy.
The tiny cylindrical resistors used in electronic circuits use color banding to show their resistance value. Manufacturers use four such color bands on the resistor body. Each band indicates a specific value. Not only the color of the band, but also the sequence or positions of the bands determines the overall resistance value of the … Read more
We can categorize the factors affecting the corona loss in three groups. The equation for power loss due to corona loss is, where, From the equation it is clear that the corona loss is a function of supply frequency. If the frequency increases, the loss increases. In AC power there is always a third harmonic … Read more