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    XGN□-12(Z) Type Indoor HV AC Gas Insulated Metal-clad Switchgear
    Summary
    XGN□-12(Z) indoor HV AC gas insulated metal-clad switchgear is a kind of floor-stand box type sectionalized vacuum circuit breaker and corollary equipment for installaion and operation at the user branch T connecting point or end sectional point in 10kV cable distribution line. It is mainly composed of vacuum circuit breaker canbinet, sectionalized switch controller and power transformer. The switchgear is used in power distribution systems with rated voltage 12kV, three phases, AC 50/60Hz for ring network power supply or terminal power supply. It is applicable to the power distribution systems for industrial & mining enterprises, residential communities, schools and gardens. It can also be equipped into a compact box type substation to control and protect the power distribution transformers. So both of the indoor and ourdoor typies RMUs can realize power distribution antomation.
    Ambient conditions
    1. Altitude: ≤2000m;
    2. Ambient temperature: -25℃~+55℃;
    3. Relative humidity: monthly average ≤90%; daily average ≤95%.
    4. Sunlight intensity: ≤1000W/m2
    5. Annual thunderstorm days: ≤70days
    6. Earthquake intensity: ≤grade 8;
    7. Pollution degree: ≤Ⅳ(GB5582);
    8. Applicable occasions: no fire and explosion danger, no chemical corrosion and no frequent severe vibration.
    Model

    Technical specification
    No. Item Unit Data
    1 Rated voltage kV 12
    2 Rated insulation level 1min P.F withstand
    voltage
    phase to phase, phase to
    earth,across open contacts
    42
    across isolating distance 48
    auxiliary loop and control loop 2
    Lightning impulse
    withstand voltage
    phase to phase, phase to
    earth,across open contacts
    75
    across isolating distance 85
    3 Rated frequency Hz 50/60
    4 Rated current A 630
    5 Rated short-circuit breaking current kA 20
    6 Rated short-circuit making current(peak) 50
    7 Rated operating sequence O-0.3s-CO-180s-CO
    8 Breaking times of rated short-circuit breaking current times 30
    9 Rated cable charging current A 25
    10 Rated peak withstand current kA 50
    11 Rated short-time withstand current 20
    12 Rated short-circuit duration s 4
    13 Averge opening speed m/s 1.2±0.2
    14 Averge closing speed 0.6±0.2
    15 Opening time At rated operating voltage ms 25±2.5
    At max/min. operating voltage 20~40
    16 Closing time At rated operating voltage 42±4.2
    At max/min. operating voltage 20~60
    17 Opening rebound mm ≤2
    18 Contact close-bouncing time ms ≤2
    19 Three-phase opening non-simultaneity ≤2
    20 Three-phase closing non-simultaneity ≤2
    21 Phase-to-phase spacing mm 135±1
    22 Resistance of loop μΩ ≤150
    23 Rated operating voltage V AC 220
    24 Rated energy storage voltage V AC 220
    25 Rated gauge pressure of SF6 gas MPa 0.01(20℃ gauge pressure)
    26 Rated min functional gauge pressure of SF6 gas 0.01(20℃ gauge pressure)
    27 Annual leakage rate of SF6 gas %/year <0.5
    28 Resistance of main loop (one unit) μΩ ≤200
    29 Protection class of housing IP 3X
    30 Menchanical life times 10000

    Main function features
    1. Structure: The switchgear is composed of integrated VCB, voltage transformer, three-phase and zero-sequence current transformer and watchdog protection controller by integration design. It has indoor type and outdoor type. It can be expanded to the multi-loop group cabinets through the busbars or it can be combined with other brand cabinets.
    2. Principle: The switchgear can distinguish line fault and achieve automatic cut-off and isolation through detection and analysis of zero sequence current.
    3. Functions: 1) can automatically cut off the single-phase grounding fault occurred on loading side of cable watchdog;
    2) can automatically isolate the short-circuit fault occurred on loading side of cable watchdog;
    3) can intiatively send the fault information to the users through the customized communication way or submit the operating voltage and current datas as per the superior’s calling.
    4. The switchgear adopts vacuum arc-extingushing method and N2 gas as insulation.
    5. The switchgear is composed of main body box which is equipped with high voltage main loop system and transmission parts, upper disconnect switch, the vacuum arc-extinguishing chamber assembly, lower grounding switch and operation mechanism.
    6. The cover for the actuator and the top cover of the casing are respectively filled holes.
    7. All the parts, wearing parts and spare parts for the vacuum circuit breaker produced according to the same pattern are interchangeable.
    8. The incoming and outgoing line bushings for the switchgear adopt American type bushings which are integrally casted by epoxy resin. They can bear 5000N of static tension along the wire horizontal direction.
    9. The upper of the box body is provided with lifting device for crane to lift the switchgear. The position of the lifting device is on the switchgear’s center of gravity so that the switchgear can keep horizontal when it is being lifted and can avoid the friction between the lifting rope and other mechanical parts.
    10. There are the obvious indicators of “Energy storage”, “Opened”, “Closed” and “Grounded” on the panel of the cabinet body to clearly show the positions of Opened/Closed/Grounded.
    11. The switchgear has a M12 grounding bolt on the shell and has a obvious grounding mark.
    12. The control parts for the switchgear have the measures of proof-moisture and anti-interference.
    13. The switchgear is equipped with a spring operating mechanism which has the breaking capacity of breaking and making the short-circuit current.
    Outline and installation dimension

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