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干式变压器的差动?；げ煌诘缍?、线路等元件的差动保护。其差动?；げ皇腔诨舴蚨傻牡缌鞑疃腔谀芰渴睾愣傻墓β什疃；?。其先特的原理决定了其现场应用具有一定的特殊性和复杂性。 </p> <p> 1.干式变压器差动?；さ墓β什疃匦? </p> <p> 干式变压器是一种功率转换元件，通过铁心磁链将能量从电源侧传递到负载侧，其一次侧和二次侧电流与比值成反比，因此没有直接的可比性。然而，干式变压器遵循能量守恒定律，其一次侧和二次侧功率大致相等。区别仅在于干式变压器的供电侧损耗，包括励磁无功损耗、铁损、铜损等有功损耗，在电力干式变压器正常运行时可以控制在额定容量的1%以内，但冲击引起的涌流功率损耗往往达到额定容量的数倍。如果处理得当，基于功率差动特性的干式变压器差动保护仍然可以成为一种快速、高灵敏度的主保护。 </p> <p> 2.现代微机干式变压器功率差动保护的实现 </p> <p> 现代干式变压器微机差动?；ざ愿墒奖溲蛊鞯腃T变比和各侧接线没有特殊要求。用户只需输入干式变压器接线组别、每侧额定电压、每侧CT变比等基本信息，即可实现智能转换。以110KV/35KV、YD5、31500KVA干式变压器为例，其接线如图1所示。 </p> <p> 在初级绕组中： </p> <p> A=L1，B=L2，C=L3 </p> <p> 在次级绕组中： </p> <p> L1'=b-a，L2'=c-b， </p> <p> L3'=a-c </p> <p> 所以： </p> <p> L1 '-L3 '=b-a-a-c </p> <p> =-3a </p> <p> a=1/3(L3'-L1 ') </p> <p> 同样的原因： </p> <p> b=1/3(L1'-L2 ') </p> <p> c=1/3(L2'-L3 ') </p> <p> 绕组a和绕组a在同一个芯柱上，通过共同的磁链完成能量交换。在忽略正常运行时损耗和外部故障的前提下： </p></p> <div class="1zlx7hpjjv5" id="prevnext"> <span>上一篇：<a href="/cpzs/4214.html">如何改进干式变压器的生产设备提高生产效率</a> </span>????? <span>下一篇：<a 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