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Overhead Lines Protection – Faults & Protection Devices

Overhead Lines Protection - Faults & Protection Devices

Overhead Lines Faults & Protection in Power System Common Faults in Overhead Lines The most common causes of faults in overhead lines are: Aircraft and cars hitting lines and structures Birds and animals Contaminated insulators Ice and snow loading Lightning Partial discharges (corona) not controlled Punctured or broken insulators Trees Wind Related Article: Power Transformer Protection & Faults Overhead Lines …

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HV And MV Switch Disconnectors And Isolators in Power System

HV And MV Switch Disconnectors And Isolators in Power System

HV/MV Switch Disconnectors And Isolators in Substation & Overhead Lines Introduction HV/MV Switch Disconnectors And Isolators High Voltage (HV) and Medium Voltage (MV)[1] installations require equipments to switching and/or isolating circuits or parts of circuits. For that purpose switch-disconnectors and isolators are used. These equipments must comply with the following IEC[2] Standards: 60038 – IEC standard voltages 61936-1 – Power …

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Design and Installation of EHV/EHV and EHV/HV Substations

Design and Installation of EHVHV and EHVHV Substations - Types and Configurations

Types and Configurations of EHV/EHV and EHV/HV Substations The Role of EHV/EHV and EHV/HV Substations in Transmission Network EHV/EHV and EHV/HV[1] substations are an important element of the electricity transmission network of a country or of a large area of a country and their functions are: Interconnection of power plants of the national or area electrical grid. Step up and …

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All About Electrical Protection Systems, Devices And Units

Electrical Protection Systems And Units

Electrical Protection Units And Systems Introduction to Electrical Protection Systems HV, MV and LV[1] electric installations and equipments are subjected to internal and external faults that can cause serious damages in persons and other equipments. To avoid and to minimize the consequences of those faults protection devices associated to equipments that are able to break electric current are required. For …

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Maintenance of Transformer – Power Transformers Maintenance, Diagnostic & Monitoring

Maintenance of Power Transformer - Transformer Diagnostic and Monitoring

Maintenance of Power Transformer – Transformer Diagnostic and Monitoring Introduction Being transformers static machines without any moving and turning parts, they are very reliable machines, and if maintained properly, can last for 40 years or more. Also they do not trip or blow when oven-stressed (except under extreme conditions), transformers are frequently overloaded and allowed to operate well beyond its …

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Current Transformers (CT) – Types, Characteristic & Applications

Current Transformers (CT) - Construction, Types, Installation, Characteristic & Applications

Current Transformers (CT) – Construction, Types, Installation, Characteristic & Applications What is Current Transformer (CT) ? Current transformers (CT) are used in High Voltage (HV) and Medium Voltage (MV)[1] installations to give an image of electrical current to protection relays and units and metering equipment and they are designed to provide a current in its secondary proportional to the current …

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Transformers Fire Protection System – Causes, Types & Requirements

Transformers Fire Protection System – Causes, Types & Requirements

Basic Requirements for Transformers Fire Protection System By: Manuel Bolotinha Causes of Fire in Transformers Excessive overheating, extremely severe short circuits, faults in the oil and lightning strokes may cause a fire on transformers. Transformer fires are rare but the impact is great. Even though a transformer involved in a fire likely will be destroyed almost immediately, as seen in …

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Submarine Cables – Construction, Characteristics, Cables Laying & Joints

Submarine Cables – Construction, Characteristics, Cables Laying & Joints

An Introduction to Submarine Cables & Subsea Power Cables Introduction to Submarine Cables The development of offshore wind farms and oil and gas offshore platforms requires the installation of power, control and monitoring and communications cables between the platforms and the main land. For this purpose submarine cables are installed, which are also used for power and/or communications between islands …

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Design of Grounding / Earthing System in a Substation Grid

Design of Grounding Earthing System in a Substation Grid - Substation earthing grid

Design of Earthing / Grounding System in a Substation Grid By: Manuel Bolotinha Introduction to Substation Earthing Grid In high and medium voltage[1]Air Insulated Substations (AIS) the electromagnetic field, which causes are the static charges of bare cable and conductors and by the atmospheric conditions (surges), induce voltages at no-live parts of the installation that create potential differences between metallic …

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