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Why are stress cones used in cable termination? When a high-voltage cable is cut for termination, the metallic sheath or screen of the cable is also cut. As a result, a sharp edge is created at the cut end of the sheath. At this sharp edge, the electric field becomes highly concentrated, which produces high … Read more
What is a VRLA Battery Bank? The full form of VRLA is “Valve Regulated Lead Acid”. Therefore, a VRLA battery means a Valve-Regulated Lead-Acid battery. It is essentially a modified version of a conventional low-maintenance lead-acid battery. Overchargings form oxygen and hydrogen gases due to electrolysis of water. These gases escape through vents provided on … Read more
Lead-acid batteries are the most commonly used battery bank systems in substations. This is a popular and robust rechargeable battery system. Before diving into the details of a lead-acid battery, we should first understand its basic charging and discharging cycles. Discharging Reaction of Lead Acid Battery During Discharging at Negative Pb Plates Diluted sulfuric acid … Read more
Normally, two kinds of overvoltage may appear in an electrical system. Power Frequency Withstanding Voltage One type is power-frequency overvoltage. In a three-phase system, a fault in one phase can increase the voltage in the healthy phases to an elevated value. This condition can continue until the clearance of the fault. Also, due to sudden … Read more
Before explaining inductance, let us recall what an inductor is. An inductor is a passive device that opposes sudden change in current through it by inducing an emf across it. Actually, an inductor is a coil of conducting wire. When current flows through an inductor, it produces a magnetic flux around it. Hence, this flux … Read more
First, we cut a 5m long sample of the stranded conductor. Then we fix the contact clamps for the measurement one meter apart from each other on the sample conductor. Then we use a Kelvin Double Bridge to measure the DC resistance of the conductor between the clamps. Also, we can use a micro-ohm meter … Read more
An inductor is any type of coil of a conductive wire. We all know from our childhood that when a current flows through a coil, it becomes a magnet. It means that whenever a current flows through the coil, it produces a magnetic flux surrounding it. Obviously, if we change the amplitude of the current, … Read more
Kirchhoff’s Current Law and Kirchhoff’s Voltage Law are two very important laws for solving electrical circuit networks. We use these laws mostly to solve network problems. Kirchhoff’s Current Law Kirchhoff’s Current Law (KCL) says that the total current entering a node equals the total current leaving the node. Obviously, a node is a point where … Read more
In our previous article, we discussed how an inductor behaves in a DC circuit. In this article, we shall discuss how an inductor behaves in an AC circuit. Suppose there is an inductor. We have connected this inductor across an alternating electrical source. The alternating source generates a pure sinusoidal signal. Now, we shall consider … Read more
The power sector is growing rapidly nowadays. Therefore, we need to increase the capacity of electrical transmission systems to fulfil the rapidly growing demands. The most basic way to increase the transmission capacity is to construct new transmission lines. However, nowadays it become almost impossible to find new corridors for new transmission lines. The increased … Read more