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Calculate derated current ratings for XLPE EHV cables — 11 kV to 220 kV, 185 to 1200 mm² — per IEC 60287 & IS 3961 with full derating factors. Selecting a high-voltage cable is not simply a matter of choosing a larger conductor size. The cable must carry the required load current continuously without exceeding … Read more
EHV XLPE cable parameter calculator per IS 7098 & IS 8130. Get resistance, impedance, sheath thickness, and short-circuit ratings instantly. Know Your Cable Before You Lay It In electrical engineering, a cable is not just a wire. It is a carefully designed system — every layer, every millimeter, every material has a reason. But calculating … Read more
In the winding resistance measurement test of a power transformer, we simply use either the ammeter-voltmeter method or the Kelvin Double Bridge method. Actually, we inject DC current to the winding of the transformer. Additionally, we measure the voltage drop across it. Then we determine the resistance value of the winding by dividing the voltage … Read more
Test your knowledge with MCQ on Lightning Arresters. Practice important objective questions with answers and explanations for exams and interviews. Video on Lightning Arresters
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.