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HXGN-12 Ring Main Unit - Reliable 12kV AC Switchgear from China Suppliers and Factory
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ring main unit

HXGN-12 Ring Main Unit - Reliable 12kV AC Switchgear from China Suppliers and Factory

The HXGN□-12ZF(R)AC metal enclosed ring main unit, commonly known as a ring main unit, is an ideal solution for AC 50Hz, 12kV networks. This unit effectively serves as a load and short-circuit breaking device, as well as a short-circuit current closing device. Manufactured in China, this advanced ring main unit features both manual and electric spring mechanisms to operate the load switch, ground switch, and isolation switch, ensuring versatility and reliability. Its compact design offers strong completeness while minimizing fire and explosion risks. With an emphasis on safety, it incorporates the reliable five prevention function. As a leading supplier and factory of electrical equipment, we are committed to providing high-quality ring main units that meet industry standards
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    Product Details

    Model meaning

    Model meaning diagram of Derui Electric RMU

    Normal service condition

    ✔ The upper limit of ambient temperature is +40℃, and the lower limit is -25℃;
    ✔ Altitude should not exceed 2000m;
    ✔ The daily average relative humidity of the air should not exceed 95%, and the monthly average should not exceed 90%; The daily average value of water vapor shall not exceed 2.2×10-3Mpa, and the monthly average value shall not exceed 1.8×10-3Mpa;
    ✔ The ambient air should not be significantly polluted by corrosive or flammable gas, water vapor, etc;
    ✔ No frequent severe vibration.

    Main technical parameters

    Item name Unit Argument
    Rated voltage/maximum operating voltage kV 10/12
    Rated current A 630
    Main busbar current Incoming cabinet A 630
    Outgoing cabinet 125
    Rated short-time withstand current kA 20
    Rated short-circuit duration s 4
    Rated peak withstand current kA 50
    Rated short-circuit making current kA 50
    Rated active load breaking current A 630
    Closed-loop breaking current A 630
    Rated cable charging current kA 20
    Rated short-time withstand current of ground switch kA 20
    Rated short-circuit duration of ground switch s 4(2)
    Rated peak withstand current of ground switch kA 50
    Rated short-circuit making current of ground switch kA 50
    1min rated power frequency withstand voltage Phase-phase, phase-ground, isolating distance of vacuum load switch kV 42
    Isolating distance of isolation switch 48
    Rated lightning impulse withstand voltage Phase-phase, phase-ground, isolating distance of vacuum load switch kV 75
    Isolating distance of isolation switch 85
    Mechanical life Vacuum load switch Time 10000
    Ground switch(knife), isolation switch(knife) 2000
    Take-over current A 3150

    Technical requirement

    The ring main unit equipped with FZN □-12/630 vacuum load switch should be able to meet all the corresponding technical requirements of FZN-12/630 vacuum load switch.

    This ring main unit is insulated with air and mainly equipped with FZN □-12/630 vacuum load switch. The main solutions include incoming and outgoing cabinets.

    ◆
    Incoming cabinet solution

    The main circuit of the cabinet has one FZN□-12/630 vacuum load switch, which is equipped with isolation knife and ground knife if necessary. The above three are installed on one frame and interlocked with each other. Therefore, it can achieve the operation of connecting the busbar, isolating and grounding three workstations, and the cabinet can also be flexibly equipped with CT, PT and other components.

    ◆
    Outgoing cabinet solution

    The main circuit inside the cabinet consists of a FZRN □-12/T200 vacuum load switch, a fuse with an striker(acting as an isolation switch) and a ground knife, which can also achieve three-station operation. The cabinet can also be flexibly equipped with components such as CT/PT and YH series lightning arrester, so sometimes the metering cabinet can be omitted. Both the incoming and outgoing cabinets are equipped with insulation protective partitions interlocked with the ground switch. The switches, partitions and cabinet doors inside the cabinet are mechanically interlocked and meet the "five prevention" requirement. The protection level of the cabinet shell is IP2X.

    Use of product

    ◆
    Usage

    Please strictly follow the following steps, otherwise it may cause damage.

    ◆
    Operation sequence of load switch
    ◇ Closing: When the load switch is in the open status, insert the operating handle into the operating hole of the load switch and turn it clockwise (about 180°) to close it.
    ◇ When the load switch is in the closed status, it can be operated by manual trip button or trip electromagnet to switch off the load switch. For load switch equipped with fuse with striker, after the fuse is blown, the striker can also switch off the load switch.
    ◆
    Power outage operation sequence
    ◇ Switch off the load switch to release the interlock between it and the isolation and ground switch.
    ◇ Insert the operating handle into the isolation and ground switch operating hole, and turn it clockwise (about 90°) to open the isolation knife.
    ◇ After rotating clockwise (about 90°) again, the ground switch quickly switches on.
    ◇ Insert the insulation partition to release the door interlock.
    ◇ Open the door for maintenance.
    ◆
    Power transmission operation sequence
    ◇ Close the cabinet door.
    ◇ Remove the insulation partition and lock the cabinet door.
    ◇ Insert the operating handle into the isolation and ground switch operating hole, rotate counterclockwise (about 90°) to disconnect the ground switch.
    ◇ Rotate the operating handle counterclockwise (about 90°) to disconnect the ground switch.
    ◇ Operate the load switch and switch it on to transmit power.

    Fault handling

    ⚠
    Fault handling instructions:

    If the fasteners of the ring main unit become loose, the mechanical parts are poorly lubricated, and the vacuum degree of the vacuum extinguishing chamber decreases during operation, methods such as tightening, adding lubricant and applying pressure resistance should be used to check and eliminate the above faults after power outage.

    Outline and installation dimension

    Outline and installation dimension diagram of the switchgear
    Frequently Asked Questions (FAQ)
    Q What are the key ambient temperature limits for the Ring Main Unit?
    The Ring Main Unit is designed to operate safely within an ambient temperature range where the upper limit is +40℃ and the lower limit is -25℃.
    Q What is the mechanical life expectancy of the vacuum load switch?
    The main vacuum load switch features a robust mechanical life rating of up to 10,000 operations, ensuring long-term durability.
    Q How does the interlocking mechanism protect operators in the outgoing cabinet?
    The switches, insulation protective partitions, and cabinet doors are mechanically interlocked to meet the strict "five prevention" requirements, preventing accidental access and misoperation.
    Q What is the rated short-time withstand current of the unit?
    The unit has a rated short-time withstand current of 20 kA for a rated short-circuit duration of 4 seconds.
    Q How should common mechanical issues or loose fasteners be resolved?
    Any maintenance, such as tightening loose fasteners, lubricating mechanical components, or checking vacuum pressure, must only be performed after a complete power outage to ensure system safety.