在電氣工程中，電力電纜、電纜橋架及母線槽的接地是確保電氣和系統(tǒng)正常運行的重要環(huán)節(jié)。這些接地要求對于從事電氣工作的人員來說是必須要了解和掌握的。

　　In electrical engineering, grounding of power cables, cable trays, and bus ducts is an important link to ensure electrical safety and normal system operation. These grounding requirements must be understood and mastered by personnel engaged in electrical work.

　　，電力電纜的接地要求關(guān)重要。電纜的接地可以有效地防止電擊事故的發(fā)生，保障人員的。同時，良好的接地還可以減少電磁干擾，提高電氣系統(tǒng)的穩(wěn)定性。在接地時，應(yīng)確保電纜的金屬護(hù)套或接地線與接地系統(tǒng)可靠連接，接地電阻應(yīng)符合相關(guān)標(biāo)準(zhǔn)。

　　Firstly, the grounding requirements for power cables are crucial. The grounding of cables can effectively prevent electric shock accidents and ensure the safety of personnel. Meanwhile, good grounding can also reduce electromagnetic interference and improve the stability of electrical systems. When grounding, it should be ensured that the metal sheath or grounding wire of the cable is reliably connected to the grounding system, and the grounding resistance should comply with relevant standards.

　　電纜橋架的接地也不容忽視。橋架作為電纜的支撐結(jié)構(gòu)，同樣需要進(jìn)行有效接地。接地不僅可以保證橋架自身的，還可以防止故障電流通過橋架傳播，保護(hù)周圍設(shè)備和人員的。此外，橋架的接地應(yīng)與整個電氣系統(tǒng)的接地網(wǎng)相連接，形成一個完整的接地體系。

　　The grounding of cable trays cannot be ignored. As a supporting structure for cables, cable trays also require effective grounding. Grounding not only ensures the safety of the bridge itself, but also prevents fault currents from propagating through the bridge, protecting the safety of surrounding equipment and personnel. In addition, the grounding of the bridge should be connected to the grounding grid of the entire electrical system to form a complete grounding system.

　　母線槽的接地要求與電纜和橋架類似。母線槽是電力傳輸?shù)闹匾M成部分，其接地質(zhì)量直接影響到系統(tǒng)的可靠性。母線槽的接地應(yīng)確保母線槽本體與接地系統(tǒng)之間的良好連接，以降低接地電阻，提高接地效果。

　　The grounding requirements for bus ducts are similar to those for cables and cable trays. Bus duct is an important component of power transmission, and its grounding quality directly affects the reliability of the system. The grounding of the bus duct should ensure a good connection between the bus duct body and the grounding system to reduce grounding resistance and improve grounding effectiveness.

　　對于干電氣的人員來說，了解和遵守這些接地要求是關(guān)重要的。在進(jìn)行電氣設(shè)計、安裝和維護(hù)工作時，必須嚴(yán)格按照相關(guān)標(biāo)準(zhǔn)和規(guī)范進(jìn)行操作，確保接地系統(tǒng)的完整性和有效性。同時，還需要定期對接地系統(tǒng)進(jìn)行檢測和維護(hù)，及時發(fā)現(xiàn)和解決可能存在的問題。下面本文就給大家分享電力電纜、電纜橋架及母線槽具體的接地要求。

　　It is crucial for electrical personnel to understand and comply with these grounding requirements. When carrying out electrical design, installation, and maintenance work, it is necessary to strictly follow relevant standards and specifications to ensure the integrity and effectiveness of the grounding system. At the same time, it is necessary to regularly inspect and maintain the grounding system to promptly identify and resolve any potential issues. Below, this article will share with you the specific grounding requirements for power cables, cable trays, and bus ducts.

　　電力電纜的接地：

　　Grounding of power cables:

　　1、110kV及以上中性點有效接地系統(tǒng)單芯電纜的終端金屬護(hù)層，應(yīng)通過接地刀閘直接與變電站接地裝置連接。

　　1. The terminal metal protective layer of single core cables with a neutral point effective grounding system of 110kV and above should be directly connected to the substation grounding device through a grounding knife switch.

　　2、在110kV及以上電纜與架空線轉(zhuǎn)彎處的終端站內(nèi)，電纜終端頭的金屬護(hù)層宜通過接地刀閘單獨接地，設(shè)計無要求時接地電阻不應(yīng)大于4Ω。電纜護(hù)層的單獨接地極與架空避雷線接地極之間應(yīng)保持3~5m距離。

　　2. At the terminal station where cables of 110kV and above turn with overhead lines, the metal protective layer of the cable terminal should be separately grounded through a grounding knife switch. If there are no design requirements, the grounding resistance should not exceed 4 Ω. The separate grounding electrode of the cable sheath should maintain a distance of 3-5m from the grounding electrode of the overhead lightning protection line.

　　3、當(dāng)接地裝置難以分開時，安裝在架空桿塔上的110kV及以上電纜終端頭金屬護(hù)層，通過接地刀閘后和架空避雷線合一接地體，設(shè)計無要求時接地電阻不應(yīng)大于4Ω。

　　3. When the grounding device is difficult to separate, the metal protective layer of the 110kV and above cable terminal installed on the overhead tower should be connected to the grounding body of the overhead lightning protection line after passing through the grounding knife switch. If there is no requirement in the design, the grounding resistance should not exceed 4 Ω.

　　4、110以下三芯電纜的終端金屬護(hù)層應(yīng)直接與變電站接地裝置連接。

　　4. The terminal metal protective layer of three core cables below 110 should be directly connected to the substation grounding device.

　　5、電力電纜接頭盒或中間接線盒外殼的接地螺栓，均必須與接地干線相連。電纜盒內(nèi)電纜的金屬包皮和鋼鎧甲，應(yīng)用等效于金屬外皮截面的銅導(dǎo)線，連接到接線盒的外殼接地螺栓上。

　　5. The grounding bolts of the enclosure of the power cable junction box or intermediate junction box must be connected to the grounding main line. The metal sheath and steel armor of the cables inside the cable box should be connected to the grounding bolt of the junction box's outer shell using copper wires with a cross-section equivalent to the metal sheath.

　　6、當(dāng)電纜穿過零序電流互感器時，電纜頭的接地線應(yīng)通過零序電流互感器后接地；由電纜頭穿過零序電流互感器的一段電纜金屬護(hù)層和接地線應(yīng)對地絕緣。

　　6. When the cable passes through the zero sequence current transformer, the grounding wire of the cable head should be grounded after passing through the zero sequence current transformer; The metal protective layer and grounding wire of the cable from the cable head to the section passing through the zero sequence current transformer should be insulated from the ground.

　　7、當(dāng)電纜保護(hù)管可觸及時必須接地，方法是與接地干線焊成一體，或者在保護(hù)管上焊一支接地螺栓后，用導(dǎo)線與接地干線相連。在一般觸及不到的地方，例如高于3.5m的電纜過橋保護(hù)管，或穿越道路時埋在地中的保護(hù)管，可不接地。在電氣工程中，電力電纜、電纜橋架及母線槽的接地是確保電氣和系統(tǒng)正常運行的重要環(huán)節(jié)。這些接地要求對于從事電氣工作的人員來說是必須要了解和掌握的。

　　7. When the cable protection tube is accessible, it must be grounded by welding it together with the grounding main line, or by welding a grounding bolt on the protection tube and connecting it to the grounding main line with a wire. In areas that are generally inaccessible, such as cable bridge protection pipes higher than 3.5m, or protection pipes buried in the ground when crossing roads, they may not be grounded. In electrical engineering, grounding of power cables, cable trays, and bus ducts is an important link to ensure electrical safety and normal system operation. These grounding requirements must be understood and mastered by personnel engaged in electrical work.

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