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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
A live tank current transformer (Live Tank CT) is a high-voltage current transformer. Here we place the entire current transformer at the top of the device. If we imagine a current transformer, the primary of the current transformer is nothing but the line conductor. Because of that, we connect the primary in series with the … Read more
When it comes to high-voltage power systems, current transformers (CTs) play a critical role. It has a vital role in measurement and protection. CTs come in two main designs—Live Tank and Dead Tank. While both serve the same fundamental purpose, they differ significantly in construction. Live tank and dead tank CTs differ mainly in insulation. … Read more
Current Transformers (CTs) play a crucial role in power systems. They perform both metering and protection functions. However, the same CT can not perform both metering and protection functions. This is because each of the protection and metering applications has different accuracy, burden-handling, and dynamic performance requirements. Hence, CTs are designed as either Metering CTs … Read more
A current transformer (CT) reduces high currents to small, usable values. We utilize CTs for metering and protection purposes. Proper CT selection ensures accuracy, safety, and reliable protection. Identify the Purpose of CT Metering CT A metering CT measures current for billing and monitoring. Therefore, it must work accurately within the tolerable upper limit of … Read more
Direct Stroke Lightning Protection (DSLP) Calculation Method Direct Stroke Lightning Protection (DSLP) is used in substations, switchyards, transformers, and other high-voltage installations to protect equipment against direct lightning strokes. The method determines the protection zone created by lightning masts (LMs) based on mast height and the height of the equipment being protected. The calculations shown … Read more
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