Short Circuit Current Calculator for EHV Cables
Thermally permissible short-circuit current calculation of EHV cable conductor and metallic sheath according to IEC 60949.
Calculation of Short-Circuit Current of Cable (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
Resistor Color Code Calculator
Calculate resistor values instantly! Support for 4, 5 & 6 band resistors with real-time visual display. Easy color selection, tolerance & accuracy.
Resistor Color Codes Explained Easily
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
What are the Factors Affecting Corona Loss – Complete Guide
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
What is Corona Critical Disruptive Voltage? Complete Guide
What is corona? At very high voltage condition of a transmission conductor, the voltage gradient distribution of the conductor from its surface along the distance in the air is not linear. Rather, it is very high at the surface of the conductor then it decreases along the distance in air gradually but not linearly. If … Read more
Oil Temperature Indicator of Transformers – A Complete Guide
In this article, we are going to discuss the Oil Temperature Indicator. In a power transformer, especially in a large power transformer, we generally see three temperature indicators installed. One is for the high-voltage winding temperature, another is for the low-voltage winding temperature, and the third one is the Oil Temperature Indicator. In this article, … Read more
What is a Winding Temperature Indicator? A Complete Article
In this article, we will discuss the Winding Temperature Indicator of a power transformer. First, let us understand what a Winding Temperature Indicator actually is. Inside the marshalling box of a power transformer in a substation, we generally see two temperature indicators, and sometimes even three temperature indicators. Among these, one is the HV Winding … Read more
Interview Questions on Power Transformers | Part – 2
What is the main purpose of a power transformer? A power transformer is mainly used to transfer power from one voltage level to another voltage level for transmission or sub-transmission purposes. Power transformers are of two types: step-up transformers and step-down transformers. A step-up transformer increases the voltage level of the generated power from the … Read more
Working of BCU (Bay Control Unit) with an Example
The full form of BCU in a substation is Bay Control Unit. Actually, you may say this is the digital version of the total control and relay panel of a bay. Sometimes, a BCU is also used as an auxiliary BCU, which performs the auxiliary control, indication, and annunciation functions of the substation. Basic Architecture … Read more