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、高壓成套設備按其功能和作用的不同，可以分為：

1. High voltage complete equipment can be divided into:

（1）元件及其組合: 包括斷路器、隔離開關、接地開關、重合器、分斷器、負荷開關、接觸器、熔斷器以及上述元件組合而成的負荷開關-熔斷器組合電器、接觸器-熔斷器（F-C）組合電器、隔離負荷開關、熔斷器式開關、敞開式組合電器等。

(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）成套設備：將上述元件及其組合與其他電器產品（諸如變壓器、電流互感器、電壓互感器、電容器、電抗器、避雷器、母線、進出線套管、電纜終端和二次元件等）進行合理配置，有機地組合于金屬封閉外殼內，具有相對完整使用功能的產品。如金屬封閉開關設備(開關柜)、氣體絕緣金屬封閉開關設備（GIS）和高壓/低壓預裝式變電站等。

(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.

高壓電器的主要技術參數包括額定電壓、額定電流、額定開斷電流、動態穩定電流、熱穩定電流等。額定電流是指設備在特定條件下可以長時間通過的工作電流。額定斷開電流是指設備在特定條件下可以正常斷開的電流。

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.

動態穩定電流是指電器在特定條件下能夠承受的峰值電流，主要反映電器承受短路電流電動力作用的能力。熱穩定電流是指電器在規定條件下能在短時間內承受的電流，主要反映電器承受短路電流熱效應的能力。此外，還有高工作電壓、燃弧時間、分斷時間、合閘電流、超范圍、剛性合閘速度等。高壓電器的技術參數必須合理協調，否則其技術性能不穩定，影響經濟指標。

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.