Vacuum Ring Main Unit | Terminal Distribution Equipment

RING MAIN UNIT

Vacuum RMU

The HXGN口-12 vacuum ring main unit is a power supply unit and terminal distribution equipment designed for power distribution systems for industrial and mining enterprises, residential areas, high-rise buildings and schools where the indoor AC voltage is 10kV and rate is 50Hz. It can open and close rated load currents and transformers with no-load currents. And it can also open and close a certain distance of the capacitor current of overhead lines, cable lines and capacitor combinations. The load switch (fuse combination cabinet) can close rated short-circuit currents instantly. In the power system, the vacuum ring main unit is used as protection for distribution equipment, distribution of electricity, and protection and control of the transformer.

Application

The HXGN口-12 vacuum ring main unit is used as protection of distribution equipment, distribution of electricity, and protection and control of the transformer; which is suitable for city networks, distribution network transformation, and residential areas.

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Technical Specifications

Rated Voltage (kV): 12

Rated Frequency (Hz): 50

Rated Current of Main Busbar (A): 630

Rated Short-Time Withstand Current (kA/s): 20/4

Rated Peak Withstand Current (kA): 50

Rated Short-Time Closing Current (kA): 50

Rated Active Power Load Breaking Current (A): 630

Rated Closed-Loop Breaking Current (A): 630

Rated Cable Charging Current (A): 10

Rated Short-Circuit Breaking Current (Circuit Breaker) (kA): 20

Rated Transfer Current (A): 1750

Power Frequency Withstand Voltage (kV): 42/48

Lightning Impulse Withstand Voltage (kV): 75/85

Mechanical Life (times): 10,000

Operating Conditions

Maximum Ambient Temperature: +60℃

Minimum Ambient Temperature: -40℃

Relative Humidity: Daily average ≤95%, monthly average ≤90%

Seismic Grade: 8

Note: Contact HCRT if a different condition is required. We offer customized solutions as well.

Features

The cabinet of the vacuum ring main unit is made of bent zinc aluminum coated steel sheet, so that it has firm structure, good sealing, and IP3X shell protection.

The cabinet has two completely isolated intervals: bus room and switch room. This kind of interval does not append isolated board to ensure safety and replace the fuse. The bus room is sealed by metal, and the bus is connected by a wall-through sleeve. According to the requirements, the front of the bus room can be equipped with fully isolated instrument room, special for installation of secondary equipment. The switch room is mainly used for installation of primary equipment and cable connection. The door and switch of the switch room is mechanical interlocking, which is simple and reliable. The cabinet door is equipped with an observation window to observe the isolated fracture and inspect the running state.

The main switch is a FZ(R)N series, this kind of switch is simple to operate, safe and reliable. The opening and closing uses manual operation, coordinating with the CS6 operation structure, so that it can open and close rapidly.

The product can be divided into three parts: cable compartment, bus compartment and control department. There is a locking device in the front and back doors, you can open the front and back door only if the medium-voltage is disconnected.