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In this article, we are going to discuss the dead tank CT or dead tank current transformer, commonly referred to as a dead tank CT. Dead tank current transformers are not popular for very high-voltage systems like 220 kV and above. Utilities often use dead tank CTs in 33 kV systems. They prefer this design … 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
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
A static electrical relay is a protection relay. It uses solid-state electronic circuits. Additionally, it does not contain any electromagnetic coils or moving parts. Therefore, we refer to it as a static relay. Basic Structure of an Electrical Static Relay A static relay operates using electronic components and circuits. For example, these components include diodes, … Read more
A Numerical Protection Relay: Modern Power System Protection A numerical protection relay is a breakthrough in power system protection technology. Unlike electromagnetic relays and static relays, this relay uses microprocessor-based technology. It combines digital signal processing, advanced algorithms, and communication systems. Today, numerical protection relays form the backbone of modern power system protection schemes. What … Read more
We are going to discuss here in this article a clear idea about SOTF Protection. Sometimes it becomes necessary to open a circuit breaker just after closing. This is due to the presence of a fault during the closing of the circuit breaker. This type of condition may arise due to different reasons. Such as … Read more