描述

MDV60A0110-5A3-4-00

若不止一臺變壓器時，運行方式往往只允許1-2臺接地運行，設(shè)計采用中性點零序電流繼電器與經(jīng)相鄰變壓器中性點零序電流繼電器控制的零序電壓繼電器配合使用的變壓器保護方案，保護回路設(shè)計先跳中性點不接地變壓器，然后中性點跳直接接地的變壓器，以防止不接地系統(tǒng)故障點的間歇性弧光過電壓危及電氣設(shè)備的安全。為避免全廠所有變壓器全部被切的嚴重后果，保護時間應(yīng)逐級配合，先斷開母聯(lián)或分斷路器，再經(jīng)零序電壓元件跳開中心點不接地主變，最后經(jīng)零序電流元件跳開中性點接地主變。對中性點有可能直接接地運行，也有可能不接地運行的主變，因失去接地中性點引起的電壓升高，應(yīng)裝設(shè)相應(yīng)的保護裝置。在直接接地時用零序電流保護。在中性點不接地時用零序電壓保護或裝設(shè)放電間隙保護，放到間隙保護起到過電壓保護的作用，當放電間隙被擊穿形成零序電流通路時，利用接在放電間隙回路的零序電流保護，切除該變壓器。變壓器采用放電間隙保護，放電間隙裝于變壓器中性點與地線之間、有棒形、球形、角形等多種形式，實際安裝中可以棒形用得最多，零序電壓保護動作電壓按發(fā)生單相接地故障時保護安裝處可能出現(xiàn)最大零序電壓整定。對變壓器高壓側(cè)中性點直接接地的自耦變壓器和三繞組變壓器采用零序過電流保護，取自變壓器中性點的零序CT安裝無方向零序保護，在主變兩側(cè)分別裝上零序保護，了為滿足選擇性可增設(shè)零序方向元件。方向元件用各斷路器側(cè)CT的自產(chǎn)零序電流。主變中性點零序電流互感器的極性接線可以將中性點零序電流保護指向本側(cè)母線或主變側(cè)。采用斷路器處的零序電流保護，和一般高中壓側(cè)方向指向各自的母線，但當中壓側(cè)不無源時，高壓側(cè)零序方向可指向主變。指向母線保護的范圍以為斷路器電流互感器安裝處開始，需要與線路零序保護配合。指向主變變壓器，需要主變壓器另一側(cè)出線的接地保護相配合。采用主變中性點處地零序電流保護，則保護范圍比斷路器處零序電流保護比要寬一些。小浪底目前運行的主變中性點零序電流保護無方向，這樣的整定配合比較清晰方便，一是限制跳開母聯(lián)斷路器，二是限制跳開本側(cè)開關(guān)。

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MDV60A0110-5A3-4-00

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