中性點接地電阻的應用特點
1. 限制接地故障電流
中性點接地電阻的主要作用之一是限制接地故障電流。當電網發生單相接地故障時,接地電阻可以限制故障電流的大小,降低對電網設備的沖擊和損壞。同時,較小的接地故障電流也有利于故障的快速排查和處理,提高電網的可靠性。
2. 提高電能質量
中性點接地電阻的合理選擇還可以提高電網的電能質量。通過限制接地故障電流,可以減少電網中的諧波含量,降低電壓波動和閃變,改善電能質量。這對于保證電力設備的安全運行、提高用戶用電體驗具有重要意義。
3. 保護人身安全
在電力系統中,接地電阻還可以起到保護人身安全的作用。當電網發生接地故障時,接地電阻可以將故障電流迅速引入大地,降低設備外殼及周圍環境的電位,減少觸電事故的發生。同時,接地電阻還可以降低雷電侵入電網時對人身和設備的威脅。
4. 適應不同電網結構
中性點接地電阻的應用特點還體現在其能夠適應不同電網結構的需求。在配電網中,由于設備種類繁多、運行環境復雜,需要根據實際情況選擇合適的接地電阻值。例如,在架空線路為主的配電網中,可以采用較大的接地電阻值來限制接地故障電流;而在電纜線路為主的配電網中,則需要較小的接地電阻值來確保故障的快速排查和處理。
5. 便于運行維護
中性點接地電阻的選擇還需要考慮電網的運行維護需求。在電網運行過程中,接地電阻的監測和維護是保證電網安全穩定運行的重要環節。因此,接地電阻的選擇應便于運行人員進行監測和維護,如采用具有遠程監測功能的接地電阻器等設備。
中性點接地電阻的選擇原則
在選擇中性點接地電阻時,應遵循以下原則:
1. 根據電網結構、設備類型和運行環境等因素綜合考慮,確定合適的接地電阻值;
2. 確保接地電阻值滿足電網安全穩定運行的要求,同時兼顧電能質量和設備保護;
3. 考慮接地電阻的監測和維護需求,選擇便于運行人員進行監測和維護的接地電阻器;
4. 在選擇接地電阻器時,應注意其性能指標和可靠性,確保其在電網運行過程中的穩定性和安全性。
外形及尺寸:根據客戶要求訂制





技術特性:
-
故障電流:1~5000A
-
系統電壓:0.38kV~110kV(3,6,10,35)
-
發熱時間:5S,10S,30S,60S,持續
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阻值(20℃):0.01~1500Ω
-
溫升:短時溫升(10~60S) [敏感詞]不超過 760℃,持續溫升[敏感詞]不超過385℃
-
免維護,拆換快速便利
-
結構緊湊,安裝方便
-
外殼防護等級: IP20~IP56
-
可選配隔離開關、輔助開關、加熱器、CT、監控器等配件。
圖示1
|
◎ HNGR6.3-300-12-10-54
|
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額定電壓Rated Voltage: 6.3/V3KV
|
故障電流Fault current: 300A
|
額定阻值Rated resitance:12Ω
|
通流時間Rated time: 10S
|
防護等級Protection degree:IP54
|
外形尺寸Dimension:寬(W)*深(D)*高(L)
|
850*1010*1500mm
|
圖示2
|
◎ HNGR6.3-400-9.09-10-23
|
|
額定電壓Rated Voltage: 6.3/ √3KV
|
故障電流Fault current: 400A
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額定阻值Rated res itance:9.09Ω
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通流時間Rated time: 10S
|
防護等級Protection degree:IP23
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外形尺寸Dimension:寬(W)*深(D)*高(L)
|
900*1300*1800mm
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圖示3
|
◎HNGR10.5-1000-6.6-10-54
|
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額定電壓Rated Voltage: 10.5/ √3KV
|
故障電流Fault current: 1000A
|
額定阻值Rated resitance:6.06Ω
|
通流時間Rated time: 10S
|
防護等級Protection degree:IP54
|
外形尺寸Dimension:寬(W)*深(D)*高(L)
|
900*1010*2000mm
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圖示4
|
◎HNGR10.5-400-15-10-33
|
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額定電壓Rated Voltage: 10.5/ √3KV
|
故障電流Fault current: 400A
|
額定阻值Rated resitance: 15Ω
|
通流時間Rated time: 10S
|
防護等級Protection degree:IP33
|
外形尺寸Dimension:寬(W)*深(D)*高(L)
|
1600*2200*2400mm
|
圖示5
|
◎HNGR35-1300-16.5-10-33
|
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額定電壓 Rated Voltage: 35/ √3KV
|
故障電流 Fault current: 1300A
|
額定阻值 Rated resitance:16.5Ω
|
通流時間 Rated time: 10S
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防護等級Protection degree:IP33
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外形尺寸Dimension:寬(W)*深(D)*高(L)
|
1600*2600*2400mm
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電氣規格:
項目 Items
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標準值 Standard
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電流范圍 Current Range
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1-5000A
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電壓范圍 Voltage Range
|
220V-110KV
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阻值范圍 Value Range
|
0.5R-1000R
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耐壓 Dielectric Strength
|
AC2.5KV-260KV/1min 50Hz可選
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IP等級 IP Class
|
IP00~IP56可選
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額定溫升 Rated Temperature Rise
|
760℃
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溫漂 Temperature drift:
|
200ppm/℃
|
應用環境:
FNGR中性點接地電阻器使用環境按DL/T593-2006 3.1 的規
戶內:周圍空氣溫度:+40℃∽-25℃;
海拔:≤3000m
小公稱爬電比距:瓷質不小于18mm/kv,有機材料不小于20mm/KV
戶外:周圍空氣溫度:+40℃∽-35℃;
海拔:≤3000m
小公稱爬電比距:Ⅱ級,Ⅲ級25mm/kv, Ⅳ31mm/kv。
注:超過正常使用條件時,由用戶與制造廠協商確定。
性能特點:
-
獨特的鋼柵結構設計:便于散熱;
-
電阻片的熱容量大:通過獨特的加工工藝,單片電阻片的額定功率可達到1200瓦
-
阻值偏差?。弘娮杵闹圃旃羁尚∮凇溃?
-
電阻片的阻值可調節范圍廣:單片范圍0.005-11.7Ω;
-
電阻片絕緣性強:電阻BANK與支撐件耐壓可達8.3kv;
-
熱態時阻值變化率?。弘娮杵捎脟膺M口不銹鋼材料,溫度系數低,熱態阻值變化率可不高于20%;
-
抗震性強:電阻片之間采用不銹鋼螺栓連接,抗震性強;
-
耐腐蝕性強:電阻片采用高溫合金材料,具有極強的耐腐蝕性;
-
性價比高:結構緊湊,電阻片數量可調,性價比高。
型號說明:

郵箱
-
微信
-
電話
- 電話:18617185077
客服
TOP
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