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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
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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
Traditional distribution transformers use cold-rolled grain-oriented (CRGO) silicon steel for their core. However, in recent years, manufacturers have preferred using amorphous iron materials. The amorphous core material is typically an amorphous iron alloy. It is mainly an iron alloy, with a small quantity of boron and silicon. Unlike CRGO steel, the amorphous material is non-crystalline … Read more
In this article, we are going to discuss the theory behind a condenser bushing. We have mainly focused on how the capacitor grading improves the voltage distribution along the thickness of the insulation. We also call it a capacitor graded bushing. There are mainly two types of condenser bushings. These are the OIP bushing and … Read more
We also refer to a resin-bonded paper bushing or a synthetic resin-bonded paper bushing, respectively, as SRBP or RBP bushings, in short form. Before entering the actual discussion of resin-bonded paper bushings, let us understand the meaning of resin-bonded paper. What is the meaning of resin-bonded? We all know that paper is a cellulose material, … Read more
An OIP bushing uses concentric cylindrical capacitors in series between the central conductor and outer insulator housing of the bushing. An OIP bushing serves the same purpose as the other types of bushings do. That means it provides proper insulation between the live conductor and the grounded metallic tank of electrical equipment, such as power … Read more