Category Archive for: «High Voltage»

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Selection of HV Conductors And Earth Wires

Aluminium ACSR Conductors Conductors represent the most important component of an overhead power line because they have to ensure economical and reliable transmission and contribute considerably to the total line costs. However, aluminum is a very corrosive metal. But a dense oxide layer is formed that stops further corrosive attacks. Therefore, up to a certain […]

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HVDC VSC Technology For Offshore Wind Farm Applications

Offshore Wind Farms The demand for the power is increasing day by day. The only one solution for this is to use the renewable sources of energy like wind, solar, water etc. Among this wind can produce major amount of power. Since the wind farm requires a lot of space and adequate amount of wind, […]

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8 Major Advantages of Distribution Automation

Economic Challenges More and more electric utilities are looking to distribution automation as an answer to the three main economic challenges facing the industry: The rising cost of adding generating capacity, Increased saturation of existing distribution networks and Greater sensitivity to customer service.[/info_box] These benefits accumulate in areas that are related to investments, interruptions and […]

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34 Questions And Answers To Break the Myth About SF6 Gas In Electrical Equipment

Miracle gas or not? There are many published discussions and reports on various aspects of  SF6 gas (sulphur hexafluoride) usage in electrical equipment. Most of them are based on facts and researches, but some are not. Let’s try to answer the 34 questions and break the myth about this ‘miracle’ gas. Note that most of […]

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Main and Transfer (Inspection) Bus Arrangement commonly used in AIS

For low reliability requirement situations The main and transfer bus configuration connects all circuits between the main bus and a transfer bus (sometimes referred to as an inspection bus). Some arrangements include a bus tie breaker and others simply utilize switches for the tie between the two buses. This configuration is similar to the single […]

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Analysing the costs of High Voltage Direct Current (HVDC) transmission

Topics discussed Introduction to HVDC Cost structure of HVDC Assumptions made in the price calculations Thyristor based HVDC system versus high voltage AC system VSC based HVDC system versus an AC system or a local generation source Comparative cost information Let’s start with introduction! It specifies a system used for transmitting or exchanging electrical power […]

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7 Most Known High Voltage Insulation Methods

Homogeneous characteristics Before getting to the specifics of each material, there are a couple of issues that apply to all materials. First, it is important that the insulating material is homogeneous. This is to ensure that the dielectric constant is the same throughout so that the electric field strength gradient is as constant as practical. […]

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An Example of Choosing 138 kV Line Circuit Breaker

Let’s choose 138 kV line #3 circuit breaker To better understand a process of high voltage equipment selection, let’s discuss an example of choosing 138 kV Line #3 Circuit Breaker, shown in Figure 1, assuming that the following information about the system is available: Continuous current for all the lines: Line #1 – 1,000 A, […]

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How to mitigate effects of very fast transients (VFT) on HV equipment

VFT overvoltages The level reached by very fast transients (VFT) overvoltages originated by disconnector switching or line-to-ground faults inside a gas insulated switchgear (GIS) are below the basic insulation level (BIL) of substation and external equipment. However, aging of the insulation of external equipment due to frequent VFT must be considered. Transient enclosure voltages (TEV) […]

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An example of calculating the technical losses of T&D lines

Introduction to Losses There are two types of losses in transmission and distribution line. Technical Losses and Commercial Losses. It’s necessary to calculate technical and commercial losses. Normally technical losses and commercial losses are calculated separately. Technical losses of the distribution line mostly depend upon electrical load, type and size of conductor, length of line […]

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