Air insulated switchgear 12kV ring network cabinet compact metal enclosed Rmu

RMU cabinets are widely used in urban ring network power supply systems due to their small space occupation, long life, maintenance-free, safe and reliable characteristics. The ring main unit in the cabinet can be equipped with SF6 ring main unit, environmental gas (N2) ring main unit, solid insulation ring m

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RMU cabinets are widely used in urban ring network power supply systems due to their small space occupation, long life, maintenance-free, safe and reliable characteristics. The ring main unit in the cabinet can be equipped with SF6 ring main unit, environmental gas (N2) ring main unit, solid insulation ring main unit, and atmospheric air ring main unit. Automatic laser welding and helium leak detection equipment are used to ensure that the gas cabinet protection level reaches IP67. Cooperating with automated terminals, functions such as protection, remote control, telemetry, automation, and centralized line loss management can be realized. Factory strict performance testing and running-in test before delivery to ensure the quality of each product.



Structure Features:

1. Cabinet material: aluminum-zinc-plate 2mm
2. Including side expansion and top expansion
3. 630A/20kV specification internal arcing duration 1S
4. Shell protection grade: Shell IP41, IK07, air box shell (304/3mm stainless steel) protection grade IP67
5. At the rated voltage Ur, the X-ray emission level at 1m away from the vacuum interrupter does not exceed 5μSv/h; at the power frequency withstand voltage Ud, the X-ray emission level at 1m away from the vacuum interrupter does not exceed 150μSv/h
6. The solubility of the salt solution is (5±1)% (mass ratio), the PH value is 6.5-7.2 at (35±2)ºC, and the spray duration is 168h

Mechanical life test: circuit breaker 10000 times (M2 level), three-station isolation/earth switch 3000 times (M1 level)

Outer box can be designed as per users' requirements.

Air Insulated Switchgear 12kV Ring Main Unit Compact Metal-Enclosed Rmu
NO.ItemUnitData
Load switchCombination unitBreaker
1Rated VoltagekV12
2Rated frequencyHz50/60
3Rated currentA630125630
41 min Power frequency withstand voltagePhase to earth and phase to phasekV42
Isolating distance48
5Lightning impulse withstand voltagePhase to earth and phase to phasekV75
Isolating distance85
6Thermal stable current (effective value)Main circuit 4SkA20
Earthing switch 2S
Earth circuit  4S17.4
7Dynamic stable current (peak)Main circuit 4SkA50
Earthing switch 2S
Earth circuit  4S43.5
8Rated short-circuit making current(peak)kA50
9Rated breaking current of active loadA630  
10Rated closed-loop breaking currentA630  
115% Rated breaking current of active loadA31.5  
12Rated cable-charging breaking currentA10  
13Rated short-circuit breaking currentkA 31.520
14Rated transfer currentA 1750 
15Mechanical lifetimes5000500010000
16SF6 rated pressure(20ºC gauge pressure)Mpa0.3
17SF6 leakage rateyear≤0.05%
18IP grade gas tank IP67
19Arc test 20kA/1s


Due to its special arc extinguishing medium and completely sealed structure, the inflatable cabinet has the characteristics of compact structure, small size, and maintenance-free compared with conventional air-insulated switch cabinets. The sealed structure can also make it suitable for high altitude, high pollution, etc. Severe working conditions and can effectively isolate external environmental influences such as chemical substances and small animals.

Air Insulated Switchgear 12kV Ring Main Unit Compact Metal-Enclosed Rmu


Our Advantage:
1.The allowable duration of arcing inside the ring main unit is 1S;
2.The arc test inside the ring main unit reaches IAC-AB level;
3.In the corrosion resistance test (salt spray test), the spray duration reached 168h;
4.Earthing switch closing (E2 level): 20kA 5 times.
5.Enclosure protection level: enclosure IP4X, compartment IP2XC, air box enclosure (304/3mm stainless steel plate) protection level IP67;
6.Ring network cabinet enclosure protection level: enclosure IP41, IK07, air box enclosure (304/3mm stainless steel plate) protection level IP67; The protection level of the ring cage is IP44W.


 
FAQ
 
Q: Are you the manufacturer or trader?
A: We are both manufacturer & trader. We have our own manufacturer named TIANYI TONGYI ELECTRIC CO.,LTD, who have 27 years experience in electric industry. It covers an totally area of 117,000 m2 with 300 employees, also is a qualified supplier of China National Nuclear Corporation(CNNC) and main supplier for State Grid & China Southern Power Grid.

Q: What is your after-sales service?
A: We always provide free online service and technical support within 24 hours. 18 months warranty for customers.

Q: What is your delivery time?
A: Normally 25~35days. It depends on the order quantity and season. We have very strong capacity to produce top quality products, please inquiry us if you have any questions.

Q: What is the quality warranty time?
A: We have quality certificate CCC, CQC, ISO9001, CE ... Meanwhile, we can provide 18 months warranty for our products. Free online service and technical support within 24 hours is always provided to our customers.

Q: Do you accept ODM and OEM?
A: Yes. We have professional R & D teams to update and develop the latest technology. We also can support ODM or OEM, please send us details drawing to discuss.

Q: What is your payment terms?
A: Generally there are two payment terms:
  1.  30% advance payment via T/T as a deposit, balance 70% against the shipping documents
  2.  Irrevocable L/C at sight

Q: If I want to visit you, how to go?
A: Our factory is located in Luoyuan County, Fuzhou City. Details address is Songshan Area, Taiwan Investment Zone, Luoyuan County, Fuzhou City, Fujian Province,China.
  1. The nearest airport is Fuzhou Airport, if you come by air, please arrive in Fuzhou Airport, it takes 1 hour from the airport to our factory
  2. The nearest train station is Luoyuan Station, if you come by train, please arrive in Luoyuan Station, it takes only 5 minutes to our factory.
Anyway, please contact us in advance, we will send the car to the airport or train station to pick you up.Sincerely welcome you to come and visit us.

Q: Do you need agents?
A: Yes, we welcome you to be a partner. Welcome to contact us for more information.


Air Insulated Switchgear 12kV Ring Main Unit Compact Metal-Enclosed Rmu
 

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