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油浸式試驗變壓器分類及保養(yǎng)
2019-01-03
油浸式試驗變壓器分類及保養(yǎng)按照單臺試驗變壓器的相數(shù)來區(qū)分,可以分為三相變壓器和單相變壓器。在三相電力系統(tǒng)中,一般應(yīng)用三相變壓器，當容量過大且受運輸條件限制時，在三相電力系統(tǒng)中也可以應(yīng)用三臺單相式變壓器組成變壓器組。按照繞組的多少來分，可分為雙繞組變壓器和三繞組變壓器。通常的變壓器都為雙繞組變壓器，即在鐵芯上有兩個繞組，一個為原繞組，一個為副繞組。三繞組變壓器為容量較大的變壓器（在5600千伏安以上），用以連接三種不同的電壓輸電線。在特殊的情況下，也有應(yīng)用更多繞組的變壓器。按照...
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避雷器放電計數(shù)器檢驗儀試驗注意事項
2019-01-03
避雷器放電計數(shù)器檢驗儀試驗注意事項1、避雷器放電計數(shù)器檢驗儀使用前請先充電，為確保充電效果和延長電池使用壽命，需使用專配的充電器?？针姵氐匠錆M約需3-4小時，充電器上紅燈亮表示正在充電。每次連續(xù)20次試驗后必須充電。2、根據(jù)計數(shù)器安裝高度，適當拉出伸縮放電桿。3、避雷器放電計數(shù)器檢驗儀專配的接地線，一端插頭插入校驗器尾部插孔，另一端夾子接大地。4、按下紅色按鈕，接通高壓約1秒鐘，指示燈亮起（微閃），必須松開按鈕。才可輕輕點擊計數(shù)器與避雷器的連接端進行測試。否則按鈕因為放電電流...
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絕緣油介質(zhì)損耗測試儀-油杯清洗方法
2019-01-02
絕緣油介質(zhì)損耗測試儀-油杯清洗方法絕緣油介質(zhì)損耗測試儀測量前，對油杯的清洗是非常重要的。因為絕緣油對極微小的污染都有極敏感的反應(yīng)，因此必須嚴格按照下述方法進行清洗。㈠*清洗程序：⑴松開定位鎖緊螺釘，手持把手將電極芯從外電極內(nèi)拔出，擰下內(nèi)電極。⑵依次用化學(xué)純的石油醚（餾程60~90℃）*清洗所有部件。⑶用丙酮對所有部件進行漂洗，然后用中性洗滌劑清洗。⑷將所有部件放入5%磷酸三鈉的蒸餾水中煮沸5分鐘，然后用蒸餾水漂洗幾次。⑸把所有部件放入蒸餾水中煮沸至少1小時。⑹將所有部件放入溫...
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絕緣油介質(zhì)損耗測試儀使用注意事項
2019-01-02
絕緣油介質(zhì)損耗測試儀使用注意事項1、絕緣油介質(zhì)損耗測試儀必須可靠接地，否則儀器報警，不進入主菜單。2、從絕緣油介質(zhì)損耗測試儀上取放油杯前，一定要關(guān)閉電源。3、油杯裝好后，先檢測空杯，電容值應(yīng)為60±5pF，介損小于0.005%；若電容值大于65時，應(yīng)重新安裝，介損不合格時，應(yīng)重新清洗油杯。4、由于新油杯可能有灰塵或布屑，所以新油杯裝好后，要用試樣油清洗三次（加入試樣油，上下左右轉(zhuǎn)動內(nèi)電極，然后倒掉），加熱后清洗效果更好。5、在安裝瓷柱時，要注意用力適度，不可過度...
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回路電阻測試儀現(xiàn)場測試常見問題
2018-12-28
回路電阻測試儀現(xiàn)場測試常見問題市場上大部分回路電阻測試儀原理是采用典型的四線制測量法，由高頻開關(guān)電源提供大于100A的測試電流，按下測量鍵時，高頻開關(guān)電源輸出大于100A以上的測試電流，同時采樣電路開始采樣，取得的信號經(jīng)放大器放大，由A/D轉(zhuǎn)換器將模擬信號轉(zhuǎn)換成數(shù)字信號后，再經(jīng)微處理器對數(shù)據(jù)進行濾波、運算、處理，后送顯示器顯示出此次測量的電流和電阻值。并可以在當電流測試回路出現(xiàn)斷線或接觸不良時，儀器會根據(jù)電流分流器上的電壓判斷出電流回路接觸不良或開路。回路電阻測試儀采用全新電...
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三相微機繼電保護測試儀試驗步驟
2018-12-28
三相微機繼電保護測試儀試驗步驟(1)三相微機繼電保護測試儀功率方向繼電器動作區(qū)和靈敏角的測量在"遞變試驗"軟件模塊中，設(shè)定Uab、Ia為額定值，設(shè)置Uab相角步長，加減電壓相位角，測出動作區(qū)兩邊邊界角φ1、φ2，則靈敏角φLM=1/2(φ1+φ2)。(2)三相微機繼電保護測試儀小動作功率的測量在"遞變試驗"軟件模塊中，將角度設(shè)置在靈敏角φLM，設(shè)定Ia(或Uab)為額定值、Uab(或Ia)為零，設(shè)置Uab(或Ia)的步長，增加電壓(或電流)。測出小動作功率。(3)三相微機繼電...
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直流高壓發(fā)生器的耐壓試驗步驟
2018-12-27
直流高壓發(fā)生器的耐壓試驗步驟直流高壓發(fā)生器在電力器件領(lǐng)域中發(fā)揮著安全防護的作用，是專門用來檢測電力器件的電氣絕緣強度和泄漏電流的設(shè)備。為了了解相關(guān)設(shè)備的絕緣預(yù)防性，就需對其進行直流高壓發(fā)生器耐壓試驗，該試驗有哪些步驟。一、直流高壓發(fā)生器在做負載試驗前，需要在倍壓筒上的高壓輸出端上裝好高壓屏蔽微安表，同時把相應(yīng)的高壓線分別接到測試品和微安表上。二、檢查測試品、直流高壓發(fā)生器、倍壓筒、放電棒、接地線、試品聯(lián)接線，確保正確性，檢查接地線是否準確連接，檢查高壓安全距離是否在標準范圍內(nèi)...
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直流高壓發(fā)生器常見故障及解決
2018-12-27
直流高壓發(fā)生器常見故障及解決直流高壓發(fā)生器，又叫直流耐壓儀，常用于對高壓電器設(shè)備的直流耐壓實驗中，以檢測泄漏電流和電氣絕緣強度。既然是機器，就不可避免地會有故障的發(fā)生，那么該如何解決呢？故障一：已經(jīng)打開電源開關(guān)，但數(shù)顯表不顯示解決辦法：查驗直流高壓發(fā)生器所有的電源線和保險管，如果是保險管有損壞則更換新保險管，注意要按照旁邊標注的安培數(shù)。故障二：已經(jīng)打開電源開關(guān)并且數(shù)顯表顯示，但高壓顯示燈不工作，加不了高壓。這種故障一般又可分為兩種情形：1.由于一些旋鈕沒有轉(zhuǎn)回零位導(dǎo)致回零燈亮...
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