|HGTXGN□-12 Type Solid Insulated Fully-enclosed Ring Main Unit(RMU)|
SummaryHGTXGN□-12 type solid insulated fully-enclosed ring main unit(RMU) is a kind of fully-sealed power supply unit. All the living parts and switch are fully sealed in an epoxy resin shell without any gas, therefore the whole switch device is not affected by external environment, and this can ensure operation stability and personal safety and realize free of maintainance. This RMU has two types of indoor and outdoor. Sealing the indoor type of RMUs in a metal enclosure makes up the outdoor mutil loops ring networks power supply unit.The RMU is used in power distribution systems with rated voltage 12kV, three phases, AC 50/60Hz for ring network power supply or terminal power supply. The RMU 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 outdoor typies RMUs can realize power distribution antomation.
Ambient conditions1. Altitude: ≤3000m;
2. Ambient temperature: outdoor, -60℃～+60℃；indoor, -10℃～+25℃；
3. Wind speed: ≤35m/s (wind pressure ≤700Pa);
4. Earthquake intensity: ≤grade 8;
5. Relative humidity: monthly average ≤90%; daily average ≤95%.
6. Ice thickness: ≤10mm
7. Sunlight intensity: ≤1000W/m2
8. Pollution degree: ≤Ⅳ(GB5582);
9. Applicable occasions: ambient air should not be obviously polluted by dust, water vapor, salt fog, corrosive gases or inflammable gas. But the outdoor type can be used in the harsh environmental conditions.
Rated parameters for RMU
Mechanical property parameters for VCB
Main function features1. The high voltage load break switch and high voltage live parts are sealed in an epoxy resin insulated sleeve shell without any gas. The vacuum arc-extingushing chamber is small and with the function of reliable arc extinction. With grounding switch, the load break switch has three stations of closing, opening and grounding. The grounding knife also has the function of isolating knife.
2. The switchgear can accommodate 1 to 5-way load break switch units, or 1 to 5-way vacuum circuit breaker units. The outgoing lines for each unit are through three high voltage bushings which are convenient for cable connection.
3. The sealed box is made of imported materials. The joint of the operation mechanism and high voltage bushing adopt strict sealing measures to ensure the good performance.
4. The high voltage bushings and insulating cylinders are made of imported epoxy resin with APG technology. They are tightly fitted and connected by silicon rubber sleeve with good sealing performance.
5. Each way is equipped with an independent operation mechanism which is mounted on the front of the cabinet body with a variety of mechanical interlock functions.
6. Both of the load break switch and grounding switch are provided with spring operating mechanism, the load break switch can be for manual or electric operation, while the grounding switch is only for manmual operation.is not only for earthing, but also for isolating. The grounding switch is not only for earthing purpose, but also for isolating purpose.
7. The vacuum circuit breaker is provided with a permanent magnetic actuator which can be for electric closing and opening, or only for manual opening, not for manual closing. The vacuum circuit breaker can also be euipped with a spring operation mechanism which can be for manual operation and electric operation. It is provided with the distribution automation interface for future connection.
8. There is a visible window on the panel of RMU for observation of the opening or closing state of the isolating knife.
9. Each RMU has three separate and parallel insulated cylinders for convenient installation, easy replacement. Its biggest advantage is to avoid the white discharge between phases.
Outline and installation dimension