Category Archive for: «Power Substation»

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Location of Current Transformers in HV Substation

Power flow Current transformers are used for protection, instrumentation, metering and control. It is only the first function that has any bearing on the location of the current transformer. In many circuits the power flow can be in either direction and it then becomes necessary to decide which location of fault is most important or likely and to […]

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6 Simple Rules to Ensure Substation Safety

Importance of safety protection Another extremely important substation engineering aspect is associated with safety protection. It is fair to say that safety is always a No. 1 priority in substation design, operation and maintenance. Unlike the case where a higher reliability required a larger investment, we can’t put a price tag on safety since there […]

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Example of standard MV/LV network structure

Network structure: Example network above consists of: MV consumer substation; Two MV ratings: 20 kV and 6 kV; The main MV switchboard fed at 20 kV can be backed up by a set of four generators. It feeds: An MV 20 kV network in a loop system comprising three secondary switchboards MV4, MV5 and MV6; […]

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What’s That Hissing, Cracking, Buzzing Noise?

Corona or Partial Discharge with Buzzing Noise Corona can be visible in the form of light, typically a purple glow, as corona generally consists of micro arcs. Darkening the environment can help to visualize the corona. We once attached a camera (set to a long exposure time) to a viewing window in a vacuum chamber […]

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Dry-Type Transformer Installation and Ventilation Requirements

Installation Dry-type transformers should be installed over foundations that are properly leveled and capable to withstand their weight. When a transformer is fitted with wheels, make sure the equipment will be equally supported on its base points in order to assure its stability and to prevent any deformation. When installing the transformer, the following factors […]

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Natural Ventilation Of Power Substation

Thermal Effects In Substation The operation of a system of natural ventilation is as a result of a decrease in air density as its temperature is raised due to the heat gain from various sources. Because the pressure differential developed is relatively small, ventilation louvers and grilles, etc, need to be of a design that […]

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An Overview Of Grounding System (Grounded)

Continued from technical article: An Overview Of Grounding System (Ungrounded) Topics covered Solidly grounded system Resistance grounded system Reason for resistance grounding System earthing at EHV level Solidly grounded system Let us assume that R phase (Phase-3 in figure-3) is shorted to ground than: If = Current through shorted path (Fault current) In = Current […]

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An Overview Of Grounding System (Ungrounded)

Topics: Ungrounded system Derivation of current expression in ungrounded system Advantages & disadvantages of ungrounded system Concept of effective and non-effective grounding Coefficient of earthing and earth fault factor Underground Neutral Or Undergrounded System Before 1950 power system were often without neutral grounding. Such system had repeated arcing grounds, insulation failure and difficult earth fault […]

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What’s Really Important When You’re Designing The Low Voltage Switchgear?

Requirements on the Switchgear Here what’s important when you’re designing the low voltage switchgear: Device Application in the Supply Circuit Short-circuit strength Release (Trip Unit) Device Application in Supply Circuits (Coupling) Device Application in the Distribution Circuit Device Application in the Final Circuit 1. Device Application in the Supply Circuit The system infeed is the […]

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Why Community Acceptance Is Important for Planning, Design and Construction of Substation?

Importance Of Community Acceptance Community acceptance generally encompasses the planning, design, and construction phases of a substation as well as the in-service operation of the substation. It takes into account those issues that could influence a community’s willingness to accept building a substation at a specific site. Government bodies typically require a variety of permits […]

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