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Here we have explain the topic on the magnetic effect of current or magnetic effect due to current. When an electric current flows through a conductor, it produces a magnetic field around it. Obviously, this phenomenon is the magnetic effect of electric current. What is a magnetic field? Actually, a magnetic field is the region … Read more
A Nickel Cadmium battery is a rechargeable chemical battery. It uses nickel oxyhydroxide as the positive active material. Also, it uses cadmium as the negative active material. Compared to other battery technologies it provides stable voltage, long cycle life, and reliable performance even under heavy load and low temperatures. Ni-Cd Battery Composition A Ni-Cd battery … Read more
An electrical protection relay is an intermediate device that bridges the function of a current transformer or a similar fault-detecting device to one or more circuit breakers. In other words, the relay connects the fault-sensing device with the fault-clearing device. Essentially, a relay has a simple magnetic coil that receives current from the current transformer. … Read more
An electromagnetic attraction type relay is the simplest form of protection relay. The relay uses an electromagnet to perform its function. Its basic construction consists of a magnetic core made of laminated, cold-rolled, grain-oriented silicon steel or laminated steel. Lamination reduces eddy current losses, while the cold-rolled structure of the iron minimizes hysteresis loss. We … Read more
We often refer to a contact multiplier relay simply as a contact multiplier. Also, we call it a contact multiplying relay or contact multiplication relay. It is a special type of electromagnetic attraction armature relay. Its function is to multiply the auxiliary contacts of a main relay. Sometimes, a protection relay does not have sufficient … Read more
An induction disc relay is a variety of electromagnetic relays. It belongs to one of the most primitive forms of conventional electromechanical protection relays. Its basic construction and working principle are quite simple. Basic Construction of Induction Disc Relay There is an electromagnet. The system current or a current proportional to the system current flows … Read more
The induction cup relay works by electromagnetic induction. It makes torque inside a light metal cup.The cup turns the moving contacts fixed to it. Finally, the relay closes its contact. It offers quick and reliable protection because of its lightweight metal cup rotor and stronger magnetic field. Definition of Induction Cup Relay The relay produces … Read more
To design the proper grounding systems for transmission line towers, we need to know the soil resistivity. Here, we shall provide a comprehensive guide. Wenner Four Point Method We follow the IEEE 81 Standard for soil resistivity measurement for this purpose. We need the following equipment for the measurement. Step-by-Step Procedure Select Test Location: We … Read more
Touch and Step Potential Calculator
In this article, we will focus on the types of SF6 circuit breakers. These are double pressure type SF6 circuit breakers and single pressure type SF6 circuit breakers. The double-pressure-type SF6 circuit breaker is an obsolete technology. Utilities, previously used in substations. Whereas the single pressure type SF6 circuit breaker is the modern design of … Read more