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.

长期以来，一些高压开关柜制造商没有严格执行相关技术标准，因此一些正在运行的开关柜中带电体的相位和相位。相位和地面之间的空气绝缘间隙大多在100~125mm之间。《高压配电装置设计技术规程》作为一种纯空气绝缘的电气设备，明确规定10kV系统纯空气绝缘的小间隙为125mm。从交流耐压试验和事故分析的结果可以看出，10kV高压开关柜中带电体的相位和相位与地面之间的小空气绝缘间隙小于125mm，容量发生事故。

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.

使用复合绝缘时，空气间隙不应忽视：

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

在一些10kV高压开关柜中，安装了一个由绝缘材料制成的隔板，形成一个带电体。空气间隙。绝缘隔板。复合绝缘模式，如接地体。从实际情况来看，使用这种复合绝缘，不能忽视空气间隙，空气间隙不小于30mm，否则很容易造成绝缘事故。

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.

接触容量不足或接触不良，引起开关柜发热：

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

当接触点容量不足或接触不良时，局部温度升高，严重情况下，载流部分烧断，导致地面或相间闪电弧，导致绝缘闪光络。110kV变电站发生了——由于刀闸下桩发热和烧断，导致开关屏起火。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.

运行环境差，维修质量低：

Poor operating environment and low maintenance quality:

通常情况下，10kV高压开关柜的运行环境较差，经常会受到灰尘、烟雾、蒸汽等因素的影响，导致绝缘层表面腐蚀，产生导电材料，形成绝缘缺陷。另外还有一些开关柜使用单位，不重视设备的维修。维修，不能及时发现和各种绝缘缺陷，终造成绝缘事故。

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.

附件绝缘性能差：

Poor insulation performance of accessories:

有许多10kV高压开关柜的制造商。为了降低成本，一些制造商采用低绝缘水平的配套配件，降低了整个开关柜的污染闪电压，不能满足额定标准要求。根据《6~10kV高压开关柜选择原则》，结合实际运行经验，附件沿表面绝缘爬电比不应低于以下要求：瓷绝缘件18mm/kV，有机绝缘件

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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