20xx繼電保護課程設計中性點直接接地系統(tǒng)零序電流保護的設計課程設計-展示頁
2025-01-14 22:07本頁面
【正文】 設置的。而發(fā)電廠正是把其他形式的能量轉(zhuǎn)換成電能，電能經(jīng)過變壓器和不同電壓等級的輸電線路輸送并被分配給用戶，再通過各種用電設備轉(zhuǎn)換成適合用戶需要的其他形式的能量。所以，在瞬時性故障法傷跳閘的情況下，自動將斷路器重合，不僅提高了供電的安全性，減少了停電損失，而且還提高了電力系統(tǒng)的暫態(tài)穩(wěn)定水平，增大了高壓線路的送點容量，所以架空線路要采用自動重合閘裝置。自動重合閘是一種廣泛應用于輸電和供電線路上的有效反事故措施。所以零序電流保護被廣泛的應用在110KV及以上電壓等級的電網(wǎng)中。繼電保護課程設計中性點直接接地系統(tǒng)零序電流保護的設計課程設計
繼電保護課程設計中性點直接接地系統(tǒng)零序電流保護的設計課程設計 摘要 電力系統(tǒng)正常運行時是三相對稱的，其零序、負序電流值理論上是零。多數(shù)的短路故障是不對稱的，其零序、負序電流電壓會很大的，利用故障的不對稱性可以找到正常與故障的區(qū)別，并且這種差別是零與很大值的比較，差異更為明顯。
自動、迅速、有選擇性地將故障組件從電力系統(tǒng)中切除，是故障組件免于繼續(xù)遭到破壞并保證其他無故障部分迅速恢復正常運行，是保證電力系統(tǒng)安全運行的最有效的方法之一，選擇110KV電力系統(tǒng)繼電保護和自動裝置的設計時遵2循其原則。即當線路出現(xiàn)故障，繼電保護使斷路器跳閘后，自動重合閘裝置經(jīng)短時間間隔后使斷路器重新合上。
關(guān)鍵詞：三相對稱 零序保護 自動重合閘 斷路器 When the normal operation of power system is the threephase symmetrical, the zero sequence and negative sequence current value in theory is zero. Most of the short circuit fault is asymmetric, the zero sequence voltage and negative sequence current will be very big, failure of asymmetry can be used to find the difference between the normal and fault, and the difference is zero and the great value of parison, the difference is more apparent. So the zero sequence current protection is widely used in more than 110 kv voltage grade of power grid. Automatic, rapid, selective removal from the power system, fault ponents is fault ponents from continue to damage and ensure the normal operation of the other parts of the troublefree back quickly, is to guarantee the safe operation of the power system, one of the most effective way to select 110 kv power system relay protection and automatic device to follow the principle of its design. Is a kind of automatic reclosing is widely used in power transmission and effective antiaccident measures on power lines. When circuit malfunction, relay protection after the circuit breaker tripped, automatic reclosing device makes the circuit breaker to close after short time interval. So, in the case of instantaneous fault spell trip, circuit breaker automatically overlap, not only improves the security of the power supply, reduce the power loss, but also improve the transient stability of power system, increasing the send capacity of highvoltage lines, so the overhead line automatic reclosing device must be used. Keywords: threephase symmetrical, zero sequence protection, automatic reclosing and circuit breakers
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