Skin Effect And Proximity Effect In Conductors

The distribution of current over the entire cross-section of the conductor is uniform in case of a DC system. But there is an unequal distribution of current over the entire cross-section of the conductor in case of AC system. Here what Skin Effect arises. What Is Skin Effect? When an AC Current flows through a conductor, it […]

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Islanding Operation in Electrical Grid

Frequency and Voltage are two important parameters which decide the healthiness of the electrical grid at a particular instant of time. Frequency fluctuations occur in the electrical grid when there is a mismatch between the amount of power generation and amount of power demand. Both under frequency and over frequency operation is harmful to the […]

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Voltage & Frequency Operating Range (tolerance) of Grid Supply in India

Frequency variation in the power system exists due to the mismatch between the supply of power and demand for the power. Voltage variations exist in the power grid is due to the mismatch in the reactive power between demand (MVAR) and available. In spite of all these variations, there is a certain limit for the […]

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Constant Voltage Transmission Advantages & Disadvanatges

Constant Voltage Transmission Voltage in a long distance transmission line drops from sending end to receiving end due to the presence of line losses in the system ( except on no-load conditions). Voltage regulation and power handling capability are two important features of the transmission line for delivering the power. The voltage of the transmission […]

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Advantages of Bundled Conductors in Transmission Lines

For transmission of more power for long distances to load centers, Extra High Voltage (EHV) transmission is employed. Implementing EHV has an advantage of the reduction in the copper losses and improves efficiency. However, transmission of voltage beyond 300kV will pose some problems such as Corona effect which causes significant power loss and interference with […]

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Gas Insulated Substations | Advantages & Disadvantages

Gas Insulated Substations (GIS) differ from Air Insulated Substations (substations we usually see) such that all the substation equipment such as busbars, circuit breakers, current transformer, potential transformers and other substation equipment are placed inside SF6 modules filled with SF6 gas. The SF6 gas which has high dielectric property acts as an insulating medium to […]

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Mobile Substations | Advantages & Applications

Mobile Substations are emergency power supply substations employed temporarily to provide power supply in the areas affected by the natural disasters such as storms, cyclones and during wars. These substations will have a maximum rating of about 220kV. Mobile Substation typically contains Trailer for the unit, Distribution Transformer, Cooling system for Transformers, Switchgear equipment (relays, […]

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Corona Ring on Surge Arresters & Other EHV Equipment

Have you ever seen a ring around the Surge Arrester or other EHV equipment? What is the purpose of the Ring around the Extra High Voltage (EHV) equipment? What is the use of big rings at EHV testing centers? This Metal Ring what we see in the substations and other transmission line network is “Corona […]

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