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ZGS □ American style box transformers

China Pad-Mounted Transformer Suppliers | Custom Box-type Substation Factory for Efficient Power Solutions

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The ZGS □ series combination substation, commonly known as the American type box substation, features a unique 品-shaped structure. This innovative design integrates the transformer with high and low voltage equipment, optimizing space and functionality. The transformer is exposed on three sides, allowing for excellent heat dissipation, and can be easily separated from the shell of the high and low voltage equipment for straightforward maintenance.

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Manufactured with a fully enclosed S-series oil-immersed transformer that utilizes a chip-type oil tank without an oil conservator, this substation is equipped with high and low voltage bushings, a tap changer, oil level indication, pressure relief valve, and oil relief valve, all strategically placed on the end plate of the high voltage compartment for easy observation and operation.

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The high and low voltage compartments are effectively separated by a robust steel plate, ensuring that the transformer remains relatively independent while maintaining the integrity of a complete box transformer. The structure is compact, lightweight, and space-efficient, making it ideal for various applications. As a leading product in China, this substation is designed for seamless integration of distribution switch equipment on both high and low voltage sides, meeting the demands of modern electrical systems. Whether you are looking for reliable suppliers or a reputable factory, this combination substation stands out for its quality and efficiency.

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    Product Details

    Model meaning

    Model meaning diagram

    Conditions of use

    Cooling condition: Air self-cooling;
    Altitude: <1000m;
    Ambient temperature: The outdoor ambient temperature shall not exceed 40℃, and not be lower than -45℃, the monthly average temperature shall not exceed 30℃, and the annual average temperature shall not exceed 20℃;
    Relative humidity: At 25℃, the relative humidity of the air does not exceed 95%, and the monthly average does not exceed 90%;
    Seismic intensity: horizontal acceleration shall not exceed 0.3m/s², vertical acceleration shall not exceed 0.15m/s²;
    Ambient environment: The installation environment should be free of obvious pollution, explosive, corrosive gas and dust;
    Installation site: There should be no severe vibration or impact, and it is required to be installed on a cement platform or other flat and solid platform;
    Note: When the above normal service conditions cannot meet the usage requirements, the user shall negotiate with the manufacturer.

    Product characteristics

    Small size, compact structure, easy installation;
    It can be used for ring network and terminal, and it can reliably protect personal safety;
    Low damage, low noise, superior performance;
    Low temperature rise and high load capacity.

    List of fuse configuration for high voltage protection

    Rated capacity of transformer (kVA) Low voltage side (0.4kV) rated current (A) High voltage side (10kV) rated current (A) Plug-in fuse capacity (A) Backup fuse capacity (A) Low voltage equipped main switch capacity (A)
    50 72.2 2.89 4 or 6 10 100
    80 115.5 4.62 10 20 160
    100 144.3 5.77 10 20 200
    125 180.4 7.22 10 25 250
    160 230.9 9.24 15 40 315
    200 288.7 11.55 20 40 400
    250 360.8 14.43 25 50 500
    315 454.7 48.19 31.5 80 630
    400 577.4 23.09 40 80 800
    500 721.7 28.87 50 100 1000
    630 909.3 36.37 65 125 1250
    800 1154.7 46.19 80 125 1600
    1000 14434 57.75 100 200 2000
    1250 1804.2 72.17 125 250 2500
    1600 2309.4 92.38 160 320 3200

    Main technical parameter table

    Technical parameter of 6kV and 10kV S□ series oil immersed distribution transformer

    Rated capacity kVA Voltage combination kV Connection group symbol Loss kW Off-load current % Short circuit impedance % Weight kg Outline dimension mm L×W×H Track gauge, longitudinal/ transverse
    HV LV Off-load Load 75% Body weight Oil weight Total weight
    30 10.5 10 63 0.4 Dyn11 Yzn11 Yyn0 0.08 0.63/0.6 1.5 4 185 70 310 790×660×925 550/400
    50 0.1 0.91/0.87 1.3 255 85 395 820×675×1030 550/400
    63 0.11 1.09/1.04 1.2 280 95 430 845×690×1065 550/400
    80 0.13 1.31/1.25 1.2 320 100 480 865×715×1075 550/550
    100 0.15 1.58/1.5 1.1 380 110 540 880×720×1120 550/550
    125 0.17 1.89/1.8 1.1 444 115 600 910×750×1110 550/550
    160 0.2 2.31/2.2 1 510 130 690 910×750×1200 550/550
    200 0.24 2.73/2.6 1 640 150 840 1220×745×1220 550/550
    250 0.29 3.2/3.05 0.9 720 190 950 1240×775×1345 660/660
    315 0.34 3.83/3.65 0.9 835 200 1065 1230×750×1345 660/660
    400 0.41 4.52/4.3 0.8 1010 240 1255 1330×825×1375 660/660
    500 0.48 5.41/5.15 0.8 1170 260 1485 1455×915×1390 660/660
    630 Dyn11 Yyn0 0.57 6.2 0.6 4.5 1375 320 1800 1540×920×1510 660/660
    800 0.7 7.5 0.6 1620 365 2120 1650×1035×1555 820/820
    1000 0.83 10.3 0.6 1780 405 2450 1855×1235×1600 820/820
    1250 0.97 12 0.5 2065 560 2855 1925×1285×1680 820/820
    1600 1.17 14.5 0.5 2470 650 3400 2025×1355×1730 820/820
    2000 1.55 18.3 0.4 5 2700 695 4460 2190×1900×1950 820/820
    2500 1.83 21.2 0.4 3230 870 5330 2240×1940×1980 1070/1070

    Note: 1. The load loss values above the diagonal line in the table are applicable to the Dyn11 or Yzn11 connection group, and the load loss values below the diagonal line are applicable to the Yn0 connection group.
    2. The outline dimensions are for reference only during selection, and the final dimensions are subject to the product's outline drawing.

    Basic structure

    The box substation should be installed on a horizontal concrete platform, which should be able to withstand the weight. Due to the fact that most of the weight of the box substation is concentrated at the rear of the box containing the transformer body, the front cabinet is mostly empty and relatively light in weight. Therefore, the rear of the platform should be sturdy and able to withstand the weight of the combined transformer. Meanwhile, it is also required that the front and rear countertops be flat (generally, it is not easy to achieve flatness, so the foundation of the front cabinet can be slightly lower than that of the rear transformer body, and after being in place, it can be sealed with concrete) to ensure smooth installation of the box substation.

    Basic structure layout planBasic structure layout details
    ① Regarding the combination size of dimensions;
    ② The concrete foundation should have a smooth surface. After the installation of the combined substation, the surrounding area of the base should be sealed with cement;
    ③ The shape of ground bars and cable fixing brackets can be determined according to the actual situation;
    ④ Cable fixing brackets and ground bars should be pre-embedded;
    ⑤ The position of the cable holes for incoming and outgoing lines depends on the specific situation;
    ⑥ After the installation of the combination substation, there must be a gap of no less than 1.5m on the front of the switch to facilitate operation;
    ⑦ The grounding grid can be made of 12 plated round steel or 30 x4 galvanized flat steel, and the ground wire resistance should meet the requirements of the power department.
    Note: The dimensions of L, W and H are determined according to the actual engineering configuration.

    Frequently Asked Questions (FAQ)

    What are the environmental temperature limits for operating this box substation?

    The substation is designed for outdoor ambient temperatures not exceeding 40℃ and not lower than -45℃. The monthly average temperature should not exceed 30℃, and the annual average temperature should not exceed 20℃.

    What type of cooling system does the transformer use?

    The substation uses air self-cooling under its standard operating conditions.

    What are the requirements for the installation platform and foundation?

    It must be installed on a horizontal concrete platform that can withstand the weight. Because the transformer body makes the rear side heavier, the rear platform must be particularly sturdy. Any unevenness can be corrected by placing the front cabinet slightly lower and sealing it with concrete after installation.

    How much clearance space is required in front of the switch?

    After the installation of the combined substation, there must be a gap of no less than 1.5 meters on the front of the switch to facilitate safe operation.

    What are the specifications for the grounding grid?

    The grounding grid can be constructed using either 12 plated round steel or 30 x 4 galvanized flat steel. The ground wire resistance must comply with local power department regulations.