GN30-12 series indoor rotary high voltage isolating switch is a new type of rotary contact knife type isolating switch. The main structure is on a three-phase common chassis and two lower planes. Two sets of insulators and contacts are fixed. Touch the knife to open and close the switch.
The GN30-12D series switch is a form of adding a grounding knife to the GN30-12 switch to meet the needs of different power systems. This product is compact in design, takes up little space, has strong insulation, and is easy to install and adjust. Its performance conforms to GB1985- The requirements of 89 "AC high-voltage isolating switch and grounding switch" are applicable to indoor power systems with a rated voltage of 12kV AC 50Hz and below, and are used for opening and closing circuits under voltage and no load conditions. It can be used together with high-voltage switchgear or alone.
Using the environment conditions:
1. The height above sea level: ≤1000m
2. Ambient air temperature: Max. + 40 ° C; Min. -10 ° C
3. Relative humidity: daily average is not greater than 95%, monthly average is not greater than 90%
4. Earthquake intensity: not exceed 8 degrees.
5.It should be installed in the places without fire, explosion, serious filth, and chemical erosion and violent vibration.
High-voltage isolation switch is an important switching device in the electrical system of power plants and substations. It must be used in conjunction with high-voltage circuit breakers. Its main function is to ensure the safety of high-voltage electrical equipment and devices during maintenance work, and to play the role of isolation voltage. Cut-off, load-load current, and open-circuit short-circuit current can only be used for certain switching operations that do not generate a strong arc, that is, it does not have an arc extinguishing function; it is divided into indoor and outdoor types according to the installation location, according to the number of insulating pillars It is divided into single-column type, double-column type and three-column type, and each voltage level has optional equipment.
The main technical parameters
Thermally stable current(kA)
Thermal stabilization time(S)
Dynamic stable current(kA)
Rated insulation level
Lightning impulse withstand voltage
Phase to phase/phase to ground 75, fracture 85
1 min power frequency withstand voltage
Phase to phase/phase to ground 42, fracture 48
Outline and installation dimension drawing