At present the technical standards of the vacuum switchgear aspects are: GB3906-91 3 ~ 35kV AC metal enclosed switchgear DL404-91 Indoor AC High Voltage Switchgear order technical conditions of technical parameters and switching refuse breaker similar technical parameters, according to the loaded trip the parameters set, the only difference is, the switch refused according to the main circuit rated current electrical components (such as isolating switches, Huixian low voltage switch cabinet, or current transformer) The minimum value of the rated current. 2. The high-voltage vacuum switch refusal of type high pressure vacuum switch, there are three classifications, each category there are several basic types, each of which has its own characteristics. High Voltage Switchgear main points of fixed and withdrawable type two; as regards the structure was divided into open, semi-enclosed, closed; inner have on the environment in terms of indoor and outdoor points; it has a mode of operation in terms of electromagnetic operating mechanism, spring-operated mechanism and a manual operator. Selection of high voltage switchgear, low voltage, the decision to use the environment within the selected user type or outdoor type according to the switchgear according to the number and amount of reliability requirements were determined using fixed or withdrawable switchgear. Fixed switchgear prices cheaper, but not as flexible as withdrawable. High reliability requirements, however, the number of switch counter and fewer substations, try to use fixed switchgear to reduce investment. To combine high wiring design of a program to determine the switchgear, low voltage switch cabinet Kaifeng County, a program can be found in the relevant switchgear electrical manuals. Combined with control, metering, protection, signal and other requirements, select or design their own secondary wiring. After you have selected the main components of the switchgear cabinet according to conditions (altitude, ambient temperature, relative humidity, sunshine, wind speed, daily temperature, etc.) and short-verified. When the operating mechanism is selected, in conjunction with the power substations operating conditions. There DC operating power (silicon rectifier, batteries, etc.) to maximize the use of the electromagnetic operating mechanism. Small substations with manual operating mechanism is relatively simple, but the switching cabinet off the flow to weaken a lot. When ordering information should be provided by the manufacturer of high voltage switchgear in general are: 1. High Voltage Switchgear model, a line protocol number, substation secondary wiring diagram and operating mechanism is equipped with a 2. High Voltage Switchgear floorplan 3. High voltage Secondary switchgear wiring diagrams and terminal diagrams; when secondary wiring standard atlases program selected program number and should indicate the voltage control circuit 4 when ordering whether cabinet variable device and indicate current Variable ratio transformer 5. The need to use non-standard one or two line program or commissioned manufacturers design, in consultation with the principle of low voltage switch cabinet factory in Zhengzhou | low voltage | Xi Xi from Henan Connaught Connaught Electrical and Mechanical and Electrical Equipment Co. provided. Henan Xi Connaught Electrical Equipment Co. (www.hnxinuo.com) strong, credible, in Zhengzhou, Henan electronics, electrical products processing industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Connaught Electrical and Mechanical study into the brilliant and you work for a better future!