該儀器主要針對10kV、35kV、110kV、220kV、變電站及線路等所有電氣主設(shè)備的交流耐壓試驗設(shè)計制造。電抗器采用多只分開設(shè)計,既可滿足高電壓、小電流的設(shè)備試驗條件要求,又能滿足低電壓的交流耐壓試驗要求,具有較寬的適用范圍,是地、市、縣級高壓試驗部門及電力安裝、修試工程單位理想的耐壓設(shè)備。 該儀器主要由變頻控制電源、勵磁變壓器、電抗器、電容分壓器組成。
~串聯(lián)諧振在電力系統(tǒng)中應(yīng)用的優(yōu)點:
1、所需電源容量大大減小。串聯(lián)諧振電源是利用諧振電抗器和被試品電容諧振產(chǎn)生高電壓和大電流的,在整個系統(tǒng)中,電源只需要提供系統(tǒng)中有功消耗的部分,因此,試驗所需的電源功率只有試驗容量的1/Q。
2、設(shè)備的重量和體積大大減少。串聯(lián)諧振電源中,不但省去了笨重的大功率調(diào)壓儀器和普通的大功率工頻試驗變壓器,而且,諧振激磁電源只需試驗容量的1/Q,使得系統(tǒng)重量和體積大大減少,一般為普通試驗儀器的1/10-1/30。
3、改善輸出電壓的波形。諧振電源是諧振式濾波電路,能改善輸出電壓的波形畸變,獲得很好的正弦波形,有效的防止了諧波峰值對試品的誤擊穿。
4、防止大的短路電流燒傷故障點。在串聯(lián)諧振狀態(tài),當試品的絕緣弱點被擊穿時,電路立即脫諧,回路電流迅速下降為正常試驗電流的1/Q。而并聯(lián)諧振或者試驗變壓器方式做耐壓試驗時,擊穿電流立即上升幾十倍,兩者相比,短路電流與擊穿電流相差數(shù)百倍。所以,串聯(lián)諧振能有效的找到絕緣弱點,又不存在大的短路電流燒傷故障點的憂患。
5、不會出現(xiàn)任何恢復(fù)過電壓。試品發(fā)生擊穿時,因失去諧振條件,高電壓也立即消失,電弧即刻熄滅,且恢復(fù)電壓的再建立過程很長,很容易在再次達到閃絡(luò)電壓前斷開電源,這種電壓的恢復(fù)過程是一種能量積累的間歇振蕩過程,其過程長,而且,不會出現(xiàn)任何恢復(fù)過電壓。
我公司調(diào)頻諧振儀器主要功能及其技術(shù)特點:
1、儀器具有過壓、過流、零位啟動、系統(tǒng)失諧(閃絡(luò))等保護功能,過壓過流保護值可以根據(jù)用戶需要整定,試品閃絡(luò)時閃絡(luò)保護動作并能記下閃絡(luò)電壓值,以供試驗分析。
2、整個儀器單件重量很輕,大不超過65kg,便于現(xiàn)場使用。
3、儀器具有三種工作模式,方便用戶根據(jù)現(xiàn)場情況靈活選擇,提高試驗速度。 工作模式為:全自動模式、手動模式、自動調(diào)諧手動升壓模式.
4、能存儲和異地打印數(shù)據(jù),存入的數(shù)據(jù)編號是數(shù)字,方便的幫助用戶識別和查找。
5、儀器自動掃頻時頻率起點可以在規(guī)定范圍內(nèi)任意設(shè)定,掃頻方向可以向上、向下選擇,同時液晶大屏幕顯示掃描曲線,方便使用者直觀了解是否找到諧振點。
6、采用了DSP平臺技術(shù),可以方便的根據(jù)用戶需要增減功能和升級,也使得人機交換界面更為人性化。 第二章 串聯(lián)諧振耐壓試驗儀主要技術(shù)參數(shù)
(一)串聯(lián)諧振耐壓試驗儀技術(shù)指標
1.輸出電壓波形畸變率:<1.0% 2. 允許連續(xù)工作時間:額定條件下一次性工作15分鐘。
3.儀器自身品質(zhì)因數(shù):Q>50 4.電纜和發(fā)電機試驗時滿負荷下品質(zhì)因數(shù):Q>30(與負載相關(guān))
5.主變壓器和線路試驗滿負荷時品質(zhì)因數(shù):Q>30(與負載相關(guān)) 6.輸入電源:三相380V或單相220V,當電源為380V時,可做額定負載試驗;當電源為220V時,只可做1/2負載試驗。 7.頻率調(diào)節(jié)范圍:20Hz~300Hz 8.系統(tǒng)測量精度:1.5% 9.儀器具有過壓、過流、零位啟動、閃絡(luò)保護等保護功能 (三)設(shè)備遵循標準 GB50150-2006 《電氣儀器安裝工程電氣設(shè)備交接試驗標準》 DL/T849.6-2004 《電力設(shè)備專用測試儀器通用技術(shù)條件第6部分:高壓諧振試驗儀器》 JB/T9641-1999 《試驗變壓器》 GB10229 《電抗器》 GB/T.311-1997 《高壓輸變電設(shè)備的絕緣與配合》 DL/T846-2004 《高電壓測試設(shè)備通用技術(shù)條件》 GB4793-1984 《電子測量儀器安全要求》 GB2900 《電工名詞術(shù)語》 GB4208 《外殼防護等級》 GB191 《包裝貯運標志》 GB/T16927-1997 《高電壓試驗技術(shù)》 (四)設(shè)備主要配置及技術(shù)參數(shù)說明: 1.變頻電源(一臺): 1.1技術(shù)參數(shù) 1.1.1 額定功率:5.5-500kW; 1.1.2 輸入電壓:三相 380V±5% 或單相220V±5% 45~65Hz,當電源為380V時,可做額定負載試驗;當電源為220V時,只可做1/2負載試驗。 1.1.3 輸出電壓:0~400V可調(diào) 1.1.4 輸出電壓頻率:20~300Hz 1.1.5 頻率調(diào)節(jié):0.1Hz步進可調(diào) 1.1.6 頻率不穩(wěn)定度:≤0.02% 1.1.7 輸出電流:13~1250A 1.2 性能特點: 1.2.1放置方式:變頻電源的放置為縱向和橫向,特別適合現(xiàn)場操作及觀察。 1.2.2防震保護:內(nèi)外部具備特殊減震橡膠支撐腳和保護鋁箱,可有效減緩運輸中的顛簸震動和吊裝時的沖擊。保證了變頻電源的長期穩(wěn)定性和可靠性。 1.2.3參數(shù)顯示:觸摸或外接鼠標大屏幕液晶界面顯示系統(tǒng)。 可顯示諧振電壓(即試驗前設(shè)置的目標電壓)、試驗頻率、測量頻率、低壓電壓、低壓電流、耐壓時間、過壓保護、過流保護、閃絡(luò)保護、階段升壓及階段計時、操作模式切換、電容,電感,頻率互換計算、參數(shù)查詢等, 還可顯示頻率曲線、電壓曲線等可直觀地判斷當次試驗諧振頻率準確及穩(wěn)定性。 1.2.4參數(shù)設(shè)置:大屏幕觸摸液晶彩屏和外接鼠標直接完成各種參數(shù)的設(shè)置。可對起始頻率、終止頻率、起始電壓、階段升壓和計時、測量分壓器變比、激勵變變比、過壓保護、過流保護、閃絡(luò)保護、試驗?zāi)J健㈦娙蓦姼蓄l率互換計算、參數(shù)設(shè)置提示以及幫助等參數(shù)進行設(shè)置或選擇。 1.2.5試驗?zāi)J剑河|摸屏和外接鼠標操作,有全自動、半自動、手動三種運行狀態(tài)。具備升壓、調(diào)諧(含手動、自動)、分段加壓和計時、運行狀態(tài)、模式切換、故障提示、電容電感頻率互換計算功能等。 1.2.6 保護功能及其信息提示:具備高壓過壓保護、低壓過流、過流保護,以及失諧保護、零位、閃絡(luò)保護、緊急停機、欠壓保護等多重保護功能。 1.2.7數(shù)據(jù)存儲功能:試驗結(jié)果保存、打印、上傳、回查等。 a、試驗結(jié)果:手動或自動試驗完畢后,在試驗結(jié)果界面中可顯示出試驗時的詳細參數(shù),當試驗發(fā)生中斷時,可提示中斷狀態(tài)。可將參數(shù)保存在存儲器中,該存儲器為非易失存儲器,可保存50次試驗記錄。 b、數(shù)據(jù)查詢:可將已保存的試驗結(jié)果數(shù)據(jù)顯示到屏幕上。同時具有USB接口,可將數(shù)據(jù)輸出打印或利用設(shè)備所攜帶打 印機打印。 1.2.8自動穩(wěn)壓功能:系統(tǒng)根據(jù)設(shè)定的試驗電壓或手動升壓結(jié)果,自動跟蹤并維持穩(wěn)定的試驗電壓,電壓穩(wěn)定度可達1.5%。 1.2.9 調(diào)頻范圍及頻率分辨率均可設(shè)定:調(diào)頻范圍可設(shè)為20~300Hz、45~100Hz、50Hz、按需設(shè)置,可加快調(diào)諧過程;頻率分辨率根據(jù)需要,可預(yù)設(shè)為0.1Hz、0.05Hz、0.02Hz、或0.01Hz,在調(diào)諧效率與調(diào)諧度之間取得優(yōu)化平衡。 頻率調(diào)節(jié)分為粗調(diào)和細調(diào),并可自動尋找試驗諧振點,保證諧振頻率在整個試驗過程中不發(fā)生漂移。 2.高壓電抗器 2.1 技術(shù)參數(shù) 2.1.1 額定工作電壓:0-1000kV 2.1.2 額定工作電流:1-10A 2.1.3 額定電感量:30-600H 2.1.4 連續(xù)工作時間:15min 2.1.5 溫 升:小于60度 2.1.6 工作頻率:20~300Hz 2.2 性能特點 2.2.1 電抗器的設(shè)計采用鐵芯式結(jié)構(gòu),漆包導(dǎo)線繞組,干式或油浸式自冷。電抗器可以自由方便疊裝及吊裝。環(huán)氧樹脂絕緣筒外殼,具有足夠的電氣、機械強度、必要的散熱能力以及油熱脹冷縮的裕度。電抗器外殼自帶底座,與另一節(jié)電抗器上端采用。外殼噴涂橘紅色絕緣漆。 2.2.2電抗器外殼自帶底座,與另一節(jié)電抗器上端采用采用卡槽結(jié)合,方便現(xiàn)場使用。 3.激勵變壓器(一臺): 3.1 技術(shù)參數(shù) 3.1.1 額定容量:3.5-500kVA 3.1.2 輸入電壓:當容量在5.5-20kW輸入是200V/400V 當容量在20-500kW輸入是400V 3.1 性能特點 3.2.1 冷卻方式:鐵箱式結(jié)構(gòu),絕緣耐熱等級為B級。 3.2.2冷卻方式:油浸全封閉式,絕緣耐熱等級為*。 3.2.3 高、低壓繞組及鐵芯間均設(shè)靜電屏蔽層,既作為勵磁變壓器,又是隔離變壓器。 4.電容分壓器(一臺): 4.1 技術(shù)參數(shù) 4.1.1自身電容量:300-5000pF 4.1.4額定電壓:10-1000kV 4.1.2工作頻率:20~300Hz 4.1.3不確定度:1.0% 4.2 性能特點 4.2.1 額定電壓下可連續(xù)運行60min。 4.2.2 在20~300Hz范圍內(nèi),其精度和穩(wěn)定度保持要求不變。 4.2.3 在20℃、0.4~0.5UN下介損值:≤0.0025 4.2.4 分壓比誤差:有效值時≤1.0%,峰值時≤1.5%。 4.2.5 高、低壓臂的電容采用一致的介質(zhì)結(jié)構(gòu),溫度系數(shù)小,角位移小,在20~300H內(nèi)分壓比不變。 4.2.6 電壓測量通過專用測試引線引至變頻電源進行測量。
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產(chǎn)品技術(shù)指標:
環(huán)境溫度: -10℃~45℃
工作濕度: ≤90%
海拔度: ≤2000m
電源輸入: 380V±10%三相或 220V±10%單相(10kW以下),50Hz
額定試驗容量: 0~5000kVA
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