Category Archive for: «High Voltage»

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5 good circuit schemes to avoid HV substation outage

Circuit schemes High voltage substations are points in the power system where power can be pooled from generating sources, distributed and transformed, and delivered to the load points. Substations are interconnected with each other, so that the power system becomes a meshed network. This increases reliability of the power supply system by providing alternate paths for […]

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Capacitive Voltage Transformers (CVT) For HV Measurements

66 kV and upwards // Capacitive voltage transformers (CVTs) are used on higher voltage levels, starting from 66 kV and upwards. The type of the CVT is always a single-pole one, thus the connection is between phase and earth. The higher the voltage level is, the more price-competitive the capacitive type becomes. One of the […]

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7 Methods To Avoid Insulator Flashovers

Transmission Line Insulator Flashovers Contamination caused insulator flashovers produce frequent outages in severely contaminated areas. Lines closer to the ocean are in more danger of becoming contaminated. Several countermeasures have been proposed to improve insulator performance. The most frequently used methods are: Increasing leakage distance Semiconducting glaze Periodic washing Periodic cleaning Replacement Covering with silicon […]

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FACTS Devices To Enhance Power System Performance

The FACTS // Flexible Alternating Current Transmission System Flexible Alternating Current Transmission System (FACTS) simply refers to a combination of power electronics components with traditional power system components. They are intended to improve our power system reliability, power transfer capability, transient and dynamic stability improvements, voltage regulation etc… With the advent of improved semiconductor technologies, […]

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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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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. 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

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 bus […]

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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 […]

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