Overview
Drawout type high voltage switchgear is a modular electrical distribution system designed for medium to large power applications. The 'drawout' or 'withdrawable' design allows circuit breakers and other components to be safely removed for maintenance without de-energizing the entire system. These switchgear systems typically operate in the 3.6kV to 40.5kV range and are essential for industrial plants, power stations, and commercial buildings requiring reliable power distribution. The design emphasizes safety, with clearly defined disconnect, test, and service positions.
Structure and Working Principle
The main components include a steel enclosure, withdrawable circuit breaker truck, busbar system, current transformers, and protective relays. The breaker truck can be moved between three positions: connected (service), test, and fully withdrawn. When in service position, the breaker is fully engaged with both primary and secondary contacts. The test position allows control circuits to be tested while main contacts remain isolated. Safety interlocks prevent unsafe operations, such as opening the door when the breaker is energized.
Key Features
Modern drawout switchgear offers several advantages. The modular design enables quick replacement of faulty breakers without system shutdown. Arc-resistant construction contains internal faults, while visible disconnects provide confirmation of circuit status. Advanced models incorporate digital protection relays, condition monitoring sensors, and remote operation capabilities. The design typically complies with international standards such as IEC 62271 and ANSI C37.20 for performance and safety.
Application Areas
These switchgear systems are widely used in industrial plants for motor control centers and main power distribution. Utilities employ them in substations for feeder protection and transformer switching. Specialized versions serve mining operations, oil refineries, and data centers where high reliability is critical. The drawout design is particularly valuable in applications requiring minimal downtime for maintenance.
Maintenance and Precautions
Regular maintenance should include contact resistance measurements, insulation testing, and mechanical operation checks. Always follow lockout/tagout procedures before servicing. Key precautions include verifying the breaker is fully disconnected before withdrawal, checking for proper grounding, and ensuring all interlocks function correctly. Environmental factors like humidity and dust accumulation should be monitored as they affect performance.
B2B Procurement Guide
When procuring drawout switchgear, consider your system's voltage requirements, short-circuit withstand capacity (typically 25kA-50kA), and future expansion needs. Evaluate manufacturer reputation, lead times, and after-sales support. For large projects, request type test reports and factory acceptance testing. Consider total cost of ownership including maintenance requirements rather than just initial purchase price. Common procurement quantities range from single units for replacement to dozens for new installations.
Related Manufacturers
- 主营：起动器、补偿柜、mns低压、开关柜、高压柜、电解粉、软启动、xdq低压、液阻柜、svg无功、软起动、电解液、启动器、启动柜、进相器、电解质、电动机、滤波柜、启动粉、水阻柜、滤波器、新百特、智能环保、工作电压、专一定制
- 主营：高压开关柜、箱式变压器、电缆分支箱、电气成套设备
- 主营：充气柜、预制舱、光伏升压站、高压中置柜、高压充气柜、高压开关柜、箱式变电站、35KV高压开关柜、高压柜、环网柜、GIS充气柜、光伏预制舱、环保柜、35KV充气柜、35KV环网柜、35KV电缆分支箱、大电流环网柜、35KV升压变、华氏箱变、电缆分支箱、六氟化硫断路器、35KV环保柜、箱变、充气柜GIS、开闭所
- 主营：真空断路器、10KV隔离开关、计量箱、高压真空断路器、户外高压真空断路器、高压隔离开关、高压永磁真空断路器、高压计量箱、10KV高压计量箱、10KV高压真空断路、10KV户外高压真空、高压分界开关、挂墙式真空断路器、35KV户外高压真空、35KV高压真空断路、35KV高压柱上真空、智能真空断路器、负荷开关、接地开关、10KV柱上真空断路、柱上分界开关、35KV永磁真空断路
- 主营：配电箱、配电柜、变压器、箱式变电站、箱式变压器、干式变压器、开关柜、高压开关柜、低压开关柜、高压配电柜、箱变、电力变压器、低压配电柜、电柜、电箱、预制舱变电站、动力柜、控制柜、防爆配电箱、变频柜、计量表箱、电缆分支箱、成套配电柜、动力配电柜
- 主营：控制柜、启动柜、起动柜、高压柜、开关柜、高压电容、高压电机、高压中置柜、高压电动机、高压软启柜、中高压进线柜、高压固态软起柜、进相器、补偿柜、出线柜、空压机、水阻柜、液阻柜、补偿装置、起动装置、控制装置、低压电容柜、无功控制器、补偿控制器、封闭开关设备
- 主营：测试仪、多功能测量仪、变压器消磁仪、直流高压发生器、便携式故障录波仪、高压绝缘设备、串联谐振试验装置、局部放电巡检仪、多倍频感应耐压装置、试验变压器、变压器绕组变形测试仪、变压器综合测试仪、断路器开关测试仪、继电保护测试仪、电缆线路测试仪、避雷器绝缘子测试仪、蓄电池测试仪、发电机检测仪器、回路测试仪、变压器测试仪
- 主营：开关柜触头盒、隔离开关、避雷器、户内外真空断路器
- 主营：测试仪、电流表、报警器、10kv高压、高压验电器、无线高压核相仪、相位表、感应电、电流钳形、台区识别仪、无线核相仪、交流钳形表、接地电阻表、在线检测仪、接地电阻仪、彩屏锂电池、绝缘电阻表、在线监测仪、高精度钳型表、智能预警装置、接地状况监测、直流低值电阻表、接地故障巡查仪、高精度电流测量、电能质量分析仪
- 主营：补偿柜、电解粉、中压柜、高压液、开关柜、高压柜、10kv高压、软启动、水电阻、进相柜、软起动、启动柜、进相器、电容柜、变频器、软起柜、水阻柜、电容器、液阻柜、控制柜、起动柜、配电柜、变频柜、低压柜、10kv电容
- 主营：环网柜、电容补偿柜、电机软启动柜、高压开关柜、低压开关柜、成套配电柜等一系列电气控制柜
- 主营：断路器、隔离开关、避雷器、开关柜、熔断器、绝缘子
- 主营：全绝缘全密封充气柜、固体绝缘环网柜、电缆分支箱、高压中置柜、高压环网柜、箱式变电站、真空断路器、环保气体柜
- 主营：10KV充气柜、10KV调压器、10KV自动化断路器、欧式箱变、箱式变电站、高压开关柜、高压环网柜、高压电缆分支箱、高压电容补偿柜、高压并联电容器、高压真空断路器、户外高压隔离开关、高压氧化锌避雷器、防风型高压跌落式熔断器、高压计量互感器、KYN28-12开关柜、TBBW-12框架式电容补偿、低压配电柜、一二次融合断路器、35KV真空断路器、SVR馈线调压器、SVG电容补偿
- 主营：起动器、进相器、补偿柜、开关柜、高压笼、高压柜、电解粉、柜安装、切电容、软启动、液阻柜、电气柜、软起动、进相机、电解液、启动器、启动柜、变频器、电解质、电动机、调速器、水阻柜、户外笼、水比例、控制柜