IEEE C37.99-1980 pdf free

04-26-2021 comment

IEEE C37.99-1980 pdf free.An American National Standard IEEE Guide for Protection of Shunt Capacitor Banks.
This guide has been prepared to assist in theeffective application of relays and other devicesfor the protection of shunt capacitors used insubstations.It covers the protective considerations along with recommended and alternatemethods of protection for the most commonlyused capacitor bank configurations. Bank design tradeoffs are also discussed since bankdesign influences protection.The guide doesnot include a discussion of pole mountedinstallations on distribution circuits or applica-tions such as capacitors connected to motorterminals.
Protection Considerations. Shunt capac-itor bank design requirements necessitate anincrease in minimum bank size with systemvoltage. The higher the system voltage thelarger is the bank investment and risk of costlydamage. Capacitors of larger kvar ratings re-duce the cost but may also reduce the choiceof different capacitor combinations.Protectionbegins with the bank design.
Availability of a capacitor bank for servicerequires reliable protection which will resultin minimal damage to the bank. The bankshould be removed from the system before it isexposed to severe damage or before a fault isestablished on the system. When a singlecapacitor unit fails within a bank, the capacitorunit should be disconnected without transfer-ring problems to adjacent units.
Table 1 summarizes the type of protectionand preventive measures. Bus fault and surgevoltage protection are conventional in nature.Capacitor overcurrent protection is obtainedthrough proper fuse coordination. Capacitormanufacturers usually assist in this task, but athorough understanding of capacitor unit andbank fusing is recommended. Consideration ofdischarge current from parallel capacitor unitsinfluences selection of fuse type.
Capacitor unit voltage,current,kVA,andtemperature are important considerations in avoiding failure.Avoiding capacitor unit failureis the first step in minimizing the probability ofcapacitor case rupture. The maximum allow-able capacitor temperature should not be exceeded.
Capacitor switching devices require specialattention since more severe switching dutiesexist for the interruption of shunt capacitorbanks than for other forms of switching.
There are five common connections. Theconnection selected depends aupon the bestutilization of the standard voltage ratings ofcapacitor units,fusing, and protective relaying.Virtually all high voltage banks are connectedin wye (Y) while low voltage banks may beconnected in Y or delta (A).IEEE C37.99 pdf download.

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