High and low voltage complete equipment includes: metal enclosed switchgear (switch cabinet), gas insulated metal enclosed switchgear (GIS), and electrical equipment such as high-voltage/low-voltage prefabricated substations, low-voltage switchgear, distribution boards, control boxes, switch boxes, etc.

1、高压成套设备按其功能和作用的不同，可以分为：

1. High voltage complete equipment can be divided into:

（1）元件及其组合: 包括断路器、隔离开关、接地开关、重合器、分断器、负荷开关、接触器、熔断器以及上述元件组合而成的负荷开关-熔断器组合电器、接触器-熔断器（F-C）组合电器、隔离负荷开关、熔断器式开关、敞开式组合电器等。

(1) Components and their combinations: including circuit breakers, isolation switches, grounding switches, reclosers, disconnectors, load switches, contactors, fuses, and load switch fuse combination appliances, contactor fuse (F-C) combination appliances, isolation load switches, fuse type switches, open type combination appliances, etc.

（2）成套设备：将上述元件及其组合与其他电器产品（诸如变压器、电流互感器、电压互感器、电容器、电抗器、避雷器、母线、进出线套管、电缆终端和二次元件等）进行合理配置，有机地组合于金属封闭外壳内，具有相对完整使用功能的产品。如金属封闭开关设备(开关柜)、气体绝缘金属封闭开关设备（GIS）和高压/低压预装式变电站等。

(2) Complete equipment: the above components and their combinations are reasonably configured with other electrical products (such as transformers, current transformers, voltage transformers, capacitors, reactors, lightning arresters, buses, incoming and outgoing line bushings, cable terminals and secondary components), organically combined in a metal enclosed enclosure, and have relatively complete use functions. For example, metal enclosed switchgear (switch cabinets), gas insulated metal enclosed switchgear (GIS), and high-voltage/low-voltage prefabricated substations.

高压电器的主要技术参数包括额定电压、额定电流、额定开断电流、动态稳定电流、热稳定电流等。额定电流是指设备在特定条件下可以长时间通过的工作电流。额定断开电流是指设备在特定条件下可以正常断开的电流。

The main technical parameters of high-voltage electrical appliances include rated voltage, rated current, rated breaking current, dynamic stable current, thermal stable current, etc. Rated current refers to the working current that a device can pass through for a long time under specific conditions. Rated breaking current refers to the current that a device can break normally under specific conditions.

动态稳定电流是指电器在特定条件下能够承受的峰值电流，主要反映电器承受短路电流电动力作用的能力。热稳定电流是指电器在规定条件下能在短时间内承受的电流，主要反映电器承受短路电流热效应的能力。此外，还有高工作电压、燃弧时间、分断时间、合闸电流、超范围、刚性合闸速度等。高压电器的技术参数必须合理协调，否则其技术性能不稳定，影响经济指标。

Dynamic stable current refers to the peak current that an electrical appliance can withstand under specific conditions, mainly reflecting the ability of the appliance to withstand the electrodynamic effect of short-circuit current. Thermal stable current refers to the current that an electrical appliance can withstand in a short period of time under specified conditions, mainly reflecting its ability to withstand the thermal effects of short-circuit current. In addition, there are also high working voltage, arcing time, breaking time, closing current, out of range, rigid closing speed, etc. The technical parameters of high-voltage electrical appliances must be reasonably coordinated, otherwise their technical performance will be unstable and affect economic indicators.