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1、IV辽宁科技大学本科生毕业设计(论文)光明35KV煤矿变电所设计摘 要变电所是电力系统的一个重要组成部分,由电器设备及配电网络按一定的接线方式所构成,他从电力系统取得电能,通过其变换、分配、输送与保护等功能,然后将电能安全、可靠、经济的输送到每一个用电设备的转设场所。本设计初步设计了煤矿地面35KV变电所设计。其设计过程主要包括负荷计算、主接线设计、短路计算、电气设备的选择、变电所的继电保护等。通过对35KV变电所的负荷统计,用需要系数法进行负荷计算,根据负荷计算的结果确定主变压器的台数、容量及型号。用标幺法对供电系统进行短路电流计算,为电气设备的选择及校验提供
2、了数据。根据煤矿供电系统的特点,制定了矿井变电所的主接线方式、运行方式。其中35KV侧为全桥接线,6KV主接线为单母线分段接线。两台主变压器采用分列运行方式。并根据电流整定值以及相关数据,选择了断路器、隔离开关、互感器等电气设备,并进行校验。此外还进行了继电保护的设计和计算,提高了整个变电所的安全性。关键词:35KV;变压器的选择;负荷计算;继电保护计算;短路电流计算IV辽宁科技大学本科生毕业设计(论文)GuangmingDesignof35KVCoalMineSubstationAbstractSubstationpowersystemisanimportant
3、componentoftheelectricalequipmentanddistributionbythenetworkconnectionmodeaccordingtoacertainpose,heobtainedpowerfromthepowersystem,throughitstransformation,distribution,transmissionandprotectionfunctions,andthenpowersafe,reliableandeconomicalelectricitysupplytoeachdevicetosetupplaces
4、.Thedesignofthecoalmineground35KVsubstationdesign.Thedesignprocessincludesloadcalculation,mainwiringdesign,short-circuitcalculation,electricalequipmentselection,substationrelayprotection,etc.Throughof35kVtransformersubstationloadstatistics,thecoefficientmethodcarriesontheloadcomputati
5、on,accordingtotheresultsofthecomputationalloadoftheidentifiedunits,capacityandmodelofthemaintransformer.Usingthestandardmethod,theshort-circuitcurrentofthepowersupplysystemiscalculated,andthedatafortheselectionandthecalibrationoftheelectricalequipmentareprovided.Accordingtothecharacte
6、risticsofcoalminepowersupplysystem,themainconnectionmodeandoperationmodeofsubstationtransformersubstationareformulated.35KVsideisthefullbridgeconnection,themainconnectionof6KVissinglebusblockconnection.Twomaintransformersbywayofrunning.Accordingtothecurrentsettingvalueandrelevantdata,
7、thecircuitbreaker,isolationswitch,transformerandotherelectricalequipmentareselected,andtheverificationiscarriedout.Inaddition,thedesignandcalculationofrelayprotectionarealsocarriedout,andthesecurityofthesubstationisimproved.KeyWords:35KV;Transformerselection;Loadcalculation;Relayprote
8、ction