Category Archive for: «Power Substation»

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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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Site selection considerations for the future power substation

Final location of the facility At this stage, a footprint of the future power substation should be developed, including the layout of the major equipment. A decision on the final location of the facility can now be made and various options can be evaluated. Final grades, roadways, storm water retention, and environmental issues are addressed at […]

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Satellite communication for remote control and monitoring of substations

Application for substation automation Substation Automation is a supervisory management and control system that lies in between transmission and distribution systems. The interests on substation automation have been increasing rapidly due to its numerous benefits to utilities. It has advanced further than a traditional Supervisory Control and Data Acquisition (SCADA) system providing additional capability and […]

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What engineers should know about using conduits in power substation designs

Design challenges There are several locations where conduit is used in power substation designs. The most common one considered is conduit used to provide cable access to equipment, such as breakers, transformers, instrument transformers, and motor-operated disconnect switches located in the yard of the substation. Conduit can be a means by which direct buried cable […]

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Microprocessor and conventional secondary systems compared

Reliable operation of the primary system Secondary systems are all those facilities needed to ensure reliable operation of the primary system, e.g. a high voltage substation. They cover the functions of controlling, interlocking, signalling and monitoring, measuring, counting, recording and protecting. With conventional secondary systems, the various functions are performed by separate devices (discrete components) […]

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Arriving at the scene of a power substation fire. What to do?

To contact utility personel Power substations contain transformers, large quantities of oil, energized electrical equipment and, in some cases, cylinders of compressed gas. Some of the oil may contain polychlorinated biphenyls (PCBs). On arriving at a substation fire, normally you should first call for firefighters and they should hook up and stand ready to protect […]

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Why is Continuous On-line Monitoring of Partial Discharge in the Switchgear Necessary?

What’s the condition of your switchgear? Not sure? You know that periodical maintenance test like partial discharge test can still leave switchgear in virtually unknown condition. Insulation defects and deterioration may very well develop in service within maintenance cycle. These defects are often not detectable with traditional off-line tests and yet, traditionally, on-line or off-line […]

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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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