I. Overview:

The intelligent switchgear (outdoor ring main unit) adopts and draws on advanced technology from abroad, installing and debugging 12/24kV switchgear, circuit breakers, load switches, current and voltage transformers, 12/24kV power supply PT, switchgear FTU, RTU, communication control terminal (CCU), 12/24kV i metering and automatic meter reading, USP power supply and indicator instruments into a movable, sealed and moisture-proof stainless steel box, thus achieving the integration and modular assembly of primary and secondary systems in urban distribution networks, shortening the construction period, and greatly improving the reliability of urban power grid operation.

II. Compliant with standards:

IEC 420 "Combination of High Voltage AC Load Switches and Fuses"

IEC 298 "AC metal enclosed switchgear and control gear for voltages above 1kV and below 52kV"

III. Usage environment

--Altitude: ≤ 1000m;

--Maximum ambient temperature:+40 ° C;

--Minimum ambient temperature: -25 ° C;

--Maximum daily temperature difference: 25K;

--Indoor relative humidity: daily average ≤ 95%, monthly average ≤ 90%;

--Seismic resistance: Ground horizontal acceleration of 0.2g and vertical acceleration of 0.1g acting simultaneously. Adopting resonance, sine, and beat wave test methods; Excite 5 times, 5 waves each time, with an interval of 2 seconds between each time, and the safety factor shall not be less than 1.67;

--The installation site should be free of gas vapor, chemical deposits, dust, pollution, and other explosive and corrosive media that seriously affect the insulation of the load switch;

--Used in ungrounded systems and 10kV systems grounded through low resistance or arc suppression coils.