With the rapid development of the power system, the number of high-voltage switchgear installations has significantly increased. In recent years, the performance and quality of high-voltage switchgear are directly related to the fault statistics of high-voltage switchgear. Statistics show that due to insulation defects, creepage, flashover, and small animal climbing, faults account for 30% of the total faults. Most old operating switchgear cannot meet the insulation distance required by national standards. There are hidden dangers in high tide or high-altitude areas. If the equipment malfunctions, it is generally believed to be caused by poor equipment quality. The level is low, so we often strive to improve the level of equipment indicators. In fact, the insulation level of equipment is also an important issue. This article introduces methods to increase the insulation level of high-voltage switchgear, effectively solving equipment failures caused by insulation issues in high-voltage switchgear.

長期以來，一些高壓開關柜制造商沒有嚴格執行相關技術標準，因此一些正在運行的開關柜中帶電體的相位和相位。相位和地面之間的空氣絕緣間隙大多在100~125mm之間。《高壓配電裝置設計技術規程》作為一種純空氣絕緣的電氣設備，明確規定10kV系統純空氣絕緣的小間隙為125mm。從交流耐壓試驗和事故分析的結果可以看出，10kV高壓開關柜中帶電體的相位和相位與地面之間的小空氣絕緣間隙小于125mm，容量發生事故。

For a long time, some high-voltage switchgear manufacturers have not strictly implemented relevant technical standards, so some operating switchgear cabinets have phases and phases of live parts. The air insulation gap between the phase and the ground is mostly between 100-125mm. The Technical Specification for Design of High Voltage Distribution Equipment, as a pure air insulated electrical equipment, clearly stipulates that the small gap for pure air insulation in 10kV systems is 125mm. From the results of AC voltage withstand test and accident analysis, it can be seen that the phase of the charged body in the 10kV high-voltage switchgear and the small air insulation gap between the phase and the ground are less than 125mm, resulting in an accident in capacity.

使用復合絕緣時，空氣間隙不應忽視：

When using composite insulation, the air gap should not be ignored:

在一些10kV高壓開關柜中，安裝了一個由絕緣材料制成的隔板，形成一個帶電體。空氣間隙。絕緣隔板。復合絕緣模式，如接地體。從實際情況來看，使用這種復合絕緣，不能忽視空氣間隙，空氣間隙不小于30mm，否則很容易造成絕緣事故。

In some 10kV high-voltage switchgear cabinets, a partition made of insulating material is installed to form a charged body. Air gap. Insulating partition. Composite insulation mode, such as grounding body. From the actual situation, using this composite insulation cannot ignore the air gap, which should not be less than 30mm, otherwise it is easy to cause insulation accidents.

接觸容量不足或接觸不良，引起開關柜發熱：

Insufficient contact capacity or poor contact, causing heating of the switchgear:

當接觸點容量不足或接觸不良時，局部溫度升高，嚴重情況下，載流部分燒斷，導致地面或相間閃電弧，導致絕緣閃光絡。110kV變電站發生了——由于刀閘下樁發熱和燒斷，導致開關屏起火。爆炸事故。

When the capacity of the contact point is insufficient or the contact is poor, the local temperature increases. In severe cases, the current carrying part burns out, leading to ground or interphase lightning arcs and insulation flashover. A 110kV substation occurred - due to the heating and burning of the pile under the knife switch, the switch panel caught fire. Explosion accidents.

運行環境差，維修質量低：

Poor operating environment and low maintenance quality:

通常情況下，10kV高壓開關柜的運行環境較差，經常會受到灰塵、煙霧、蒸汽等因素的影響，導致絕緣層表面腐蝕，產生導電材料，形成絕緣缺陷。另外還有一些開關柜使用單位，不重視設備的維修。維修，不能及時發現和各種絕緣缺陷，終造成絕緣事故。

Usually, the operating environment of 10kV high-voltage switchgear is poor, and it is often affected by factors such as dust, smoke, steam, etc., resulting in corrosion of the insulation layer surface, the generation of conductive materials, and the formation of insulation defects. In addition, some switchgear users do not attach importance to equipment maintenance. Repair, failure to timely detect and eliminate various insulation defects, ultimately leading to insulation accidents.

附件絕緣性能差：

Poor insulation performance of accessories:

有許多10kV高壓開關柜的制造商。為了降低成本，一些制造商采用低絕緣水平的配套配件，降低了整個開關柜的污染閃電壓，不能滿足額定標準要求。根據《6~10kV高壓開關柜選擇原則》，結合實際運行經驗，附件沿表面絕緣爬電比不應低于以下要求：瓷絕緣件18mm/kV，有機絕緣件

There are many manufacturers of 10kV high-voltage switchgear in China. In order to reduce costs, some manufacturers use matching accessories with low insulation levels to reduce the pollution flashover voltage of the entire switchgear, which cannot meet the rated standard requirements. According to the "Selection Principles for 6-10kV High Voltage Switchgear" and combined with practical operating experience, the creepage ratio of accessories along the surface insulation should not be lower than the following requirements: porcelain insulation parts 18mm/kV, organic insulation parts

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