Power System Protection And Switchgear By Badri Ram Dn Vishwakarma Pdf 45
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Most commonly, industrial electrical systems are protected by a combination of feeder and distribution overprotection (a set of protective relays), as well as sub-stations and substations (a set of protective relays). Some systems include a power quality relay (a set of protective relays) that will monitor and respond to a variety of conditions, such as the generation and the distribution of harmonics or pulsations. These conditions can disrupt the performance of the system and cause improper operation of the relays. Nevertheless, these conditions may be present in normal operation of the system. Monitoring and reacting to these conditions is a critical part of the operation of the system. The combination of protective relays, feeder relays, and power quality relays is called the protection system.
The practical applications of protection systems can vary from very simple systems, such as home wiring, to complex systems with many different methods, such as electric power distribution systems. Each of these systems has many different types of protection methods.
The SPOF protection must be tested and verified to ensure that it is not possible for the SPOF to disrupt the operation of the system. Failure of the SPOF would prevent the system from ever reaching its design goal of being reliable. Test equipment is used to perform these tests and verify that the SPOF is functioning as designed.
The safe and reliable operation of a system is often based on a risk analysis done by an experienced person. It is important that the person doing the risk analysis have a thorough understanding of not only the equipment, but also the theoretical principles governing the safety of the system. A very common set of rules for risk analysis are defined in the IEEE Std 1241-1987 (IEEE Std 1241-1987). Also, there are many standards organizations and associations providing guidance on safety of electrical equipment.[8]
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