Used in the 10kV, 50Hz three-phase power distribution system for control and protection of power equipment such as transformer, cables, and overhead lines, especially suitable for terminal substations and box-type substations used in urban network and rural network and for control and protection of ring network and dual radiant power supply unit.
|4||Rated insulation level||Power frequency withstand voltage for 1 minute||Voltage to ground, Phase-phase voltage||kV||42||42|
|Vacuum break voltage||30||30|
|Lightning impulse withstand voltage (peak)||Voltage to ground, Phase-phase voltage||75||75|
Working environment conditions:
1.1 Ambient temperature: Upper limit: +40ºC; Lower limit: -15ºC;
1.2 The altitude does not exceed 1000m.
1.3 For relative air humidity, the daily mean is not greater than 95%, and the monthly mean is not greater than 90%;
1.4 The earthquake intensity does not exceed 8 degrees.
1.5 Installed in places free of fire, explosive risk, chemical corrosion, and violent vibration.
1.6 The installation site shall be free of flammable substance, explosive risk, chemical corrosion and violent vibration.
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