Category Archive for: «High Voltage»

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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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Hey Mom, look at that big HVDC Transformer!

Key component HVDC transformers are key components of HVDC stations. HVDC converter and inverter stations terminate long-distance DC transmission lines or DC sea cables. This type of transformer provides the interface between AC grids and high power rectifiers and are used to control the load flow over the DC transmission lines. Design options The design […]

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8 Main Disadvantages of HVDC Transmission

High Voltage Direct Current (HVDC) Few weeks back I posted an article about advantages of HVDC over HVAC transmission systems. Advantages of HVDC are numerous and very well recognized, but like everything on this earth this system has other side too. The eight main disadvantages of HVDC transmission systems, including DC links connecting HVAC systems area, […]

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Electrical Thumb Rules You MUST Follow (Part 7)

Continued from: Electrical Thumb Rules You MUST Follow (Part 6) 8 electrical thumb rules to follow: Overhead conductor / cable size Transmission / distribution  line (span, height of tower) Types of towers Tower swing angle clearance (metal part to live part) Cable coding, IS 1554 (A2XFY, FRLS, FRPVC, FRLA, PILC) Corona ring size Load as per […]

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