17.5kV SF6 GIS for Secondary Distribution / Ring Main Unit

Introduction
Main Technical Parameter
NG7-17.5 series switchgear is a kind of modular fully insulated fully sealed ring network switchgear for medium voltage distribution network, NG7-17.5 series switchgear can be used indoors, outdoors, when used indoors,most of the composition of indoor opening and closing stations, can be installed after leaving the factory, without any special tools, switchgear inflatable compartment protection level up to IP67. When used outdoors,the box protection level is generally IP54, mainly used for medium voltage distribution network, the equipment is not affected by high altitude,condensation, pollution, small animals and chemical substances and other external environmental influences, small size, maintenance-free, widely used in urban commercial centers, industrial concentration areas, airports,highways and other distribution network systems, it is not only conducive to the flexible application of line ring network, but also can be designed as dual power supply self-invested power supply to ensure power supply reliability.Before shipment, all of our unit modules are factory tested.

Product technical characteristics

• NG7-17.5 series switchgear operates under normal indoor conditions:
• Maximum temperature: +75° C
• Minimum temperature: -40° C
• 24-hour average maximum temperature: +35° C
• Humidity: Maximum average relative humidity (2 4-hour measurement) 95%;
• Maximum average relative humidity (1 month measurement) 90%
• In the case of installation without reducing the gas pressure: the maximum altitude is 1500 m
  

NG7-17.5 series switchgear applications in outdoor operation:

• Altitude：≤4000m
• Ambient temperature: maximum temperature: +50 ° C; The average temperature within 24h does not exceed +35 ° C
• Ambient humidity: 24h relative humidity average does not exceed 95%; The average monthly relative humidity does not exceed 90%
• Installation environment: the surrounding air is free of explosive and corrosive gases, and there is no violent vibration in the installation site Impact, pollution level does not exceed THE III. level in GB/T5582;
• Ground acceleration caused by earthquakes: below the horizontal direction. 3g; Vertically below. 15g

Main Technical Parameter

Primary wiring scheme