Catalog of Electrical Engineering questions with useful answers that help you develop a clear insight of your conceptual problems.
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The Buchholz relay serves a crucial role in safeguarding oil-filled transformers by detecting and responding to internal faults. Positioned within the transformer’s oil conservator, this protective device is designed to identify the accumulation of gases, notably hydrogen and methane, generated during electrical faults such as internal short circuits and partial discharges. A float within the … Read more
The top most wire in overhead transmission lines is the ground wire. Ground wires are bare conductors supported at top of transmission lines. Ground wires serve to shield the power line and intercept lightning strokes before it hits current carrying conductors below. Ground wires are not intended to carry current under normal circumstances. Also see:
A differential relay is a power system protection relay that operates when the phasor difference of two or more similar electrical quantities exceeds a pre-determined value. The two ends of overhead transmission lines are several kilometers apart, in order to compare two currents, a costly pilot-wire circuit is used. Such pilot wires are too expensive … Read more
Very often a panel enclosure is located near ground level on distribution lines, In this article Electrical Engineering shares what is purpose of this panel. The grey enclosure located near ground level on this pole contains the protective relay responsible for issuing the “trip” and “close” signals to the recloser’s coils. Current transformers located within … Read more
A service mains is usually a small cable that connects the distributor to the consumers terminals. In power distribution schematic below, service mains are indicated in red color.
The distributor is an electrical conductor from which tappings are taken for supply to the consumers. The electric current flowing through a distributor is not constant, since tappings are taken at various places along its length. While designing a distributor, voltage drop along its length is the main consideration since the statutory limit of voltage … Read more
The feeder is an electrical conductor which connects the substation or localised station to the area where power is to be distributed. Generally, no tappings are taken from the feeder and current in a feeder remains same throughout. The primary consideration in the design of a feeder is the current carrying capacity. The figure below … Read more
The part of electrical power system which distributes electric power for local use is known as distribution system. Electrical power distribution system is the part of electrical system between the substation fed by the transmission system and the consumers meters. Distribution system comprises of feeders, distributors and the service mains. The figure below displays basic … Read more
Open circuit test is used to find core or iron losses on transformer. Open circuit test is used mainly with power transformers. Short circuit and open circuit tests provide the data needed to determine a transformer’s equivalent circuit and to compute its efficiency. Álso see Most Important Questions on Transformers: Further Reading/Handbooks on Transformers:
Open circuit test is used to find core or iron losses on transformer. The figure below displays the circuit diagram for open circuit test on transformers: Álso see Most Important Questions on Transformers: Further Reading/Handbooks on Transformers: