The combination of more than one conductor per phase in parallel suitably spaced from each other used in an overhead transmission line is defined as a bundled conductor. The individual conductor in a bundle is defined as a sub conductor. Bundled conductors in transmission lines are commonly used to increase electrical capacity and reduce corona and radio noise at voltages … [Read more...] about Bundled Conductors in Transmission Lines
The ratio of output in kWh to the input in kWh of a transformer over a 24-hour period is known as all day efficiency. The ordinary or commercial efficiency of a transformer is defined as the ratio of output power to the input power. Commercial efficiency = Output power ∕ Input power Importance of All Day Efficiency There are certain types of transformers whose … [Read more...] about All Day Efficiency of Transformer
The difference in level between points of supports and the lowest point on the conductor is called sag in overhead transmission lines. Sag in Hot and Cold Day While erecting an overhead line, it is very important that conductors are under safe tension. If the conductors are too much stretched between supports in a bid to save conductor material, the stress in the … [Read more...] about Sag in Overhead Transmission Lines
By parallel operation of single-phase transformers, we mean two or more transformers are connected to the same supply bus bars on the primary side and to a common bus bar/load on the secondary side. Such a requirement is frequently encountered in practice. Two transformers A and B connected in parallel are shown in the figure. While connecting two or more than two … [Read more...] about Parallel Operation of Single Phase Transformers
What is an Electric Locomotive? An “Electric Locomotive” is a railway vehicle that can move along rails and push or pull a train attached to it using electric power drawn from an external source, usually from overhead cables or a third rail. Electric Locomotives do not have a conventional “engine” in them as we have seen in a diesel locomotive, but use the electricity … [Read more...] about How Electric Locomotives (Electric Trains) Work?