Products - CHINA·LONGXI ELECTRIC CO.,LTD.

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Products

HGTXGN□-12 Type Solid Insulated Fully-enclosed Ring Main Unit(RMU)

Summary

HGTXGN□-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 conditions

1. 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.

Model

Technical specification

Rated parameters for RMU

No.	Item		Unit	Data
1	Rated voltage		kV	12
2	Rated current		A	630、1000、1250
3	Rated frequency		Hz	50/60
4	Rated short-time withstand current for isolator/granding switch(4s)		kA	16、20、25
5	Rated peak withstand current for isolator/granding switch			40、50、63
6	Rated short-circuit breaking current			16、20、25
7	Breaking times of rated short-circuit breaking current		times	30
8	Rated short-circuit making current(peak)		kA	40、50、63
9	1min P.F withstand voltage	Across contact distance, phase to phase, phase to earth	kV	42
		Across isolating distance		48
	Lightning impulse withstand voltage	Across contact distance, phase to phase, phase to earth		75
		Across isolating distance		85
10	Mechanical life	Vacuum circuit breaker	times	10000
		Isolating switch / grounding switch		2000
11	Resistance of main loop(one unit)		ｕΩ	≤100
12	Breaking current for different phases grounding fault		kA	17.4
13	Protection class of housing		IP	3X

Mechanical property parameters for VCB

No.	Item	Unit	Data
1	Rated operating sequence		O-0.3s-CO-180s-CO
2	1min P.F withstand voltage for secondary loop	kV	2
3	Distance between open contacts	mm	9±1
4	Contact over-travel	mm	3±0.5
5	Average opening speed	m/s	1.2±0.2
6	Average closing speed	m/s	0.8±0.2
7	Contact close-bouncing time	ms	≤2
8	Closing time		25～70
9	Opening time		20～50
10	Phase-to-phase spacing	mm	135±1
11	Three-phase opening non-simultaneity	ms	≤2
12	Three-phase closing non-simultaneity	ms	≤2
13	Rated closing/opening operating voltage	V	DC220
14	Max/min closing operating voltage		DC242/176
15	Max/min opening operating voltage		DC264/143
16	Opening rebound	mm	≤2

Main function features

1. 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