11kV SF6 Ring Main Unit RMU

Name: China Customized 11kV SF6 Ring Main Unit RMU Manufacturers, Suppliers - FENGYUAN
Brand: Fengyuan Power
SKU: 121324317

SF6 Ring Main Unit RMU is suitable for 11 / 17.5 / 24/36 kV secondary distribution network. It is a completely sealed system with a stainless steel storage tank containing all live parts and switching functions. Sealed steel tanks with constant atmospheric conditions ensure a high degree of...

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Description

It provides switch fuse combinations or circuit breakers with relays to protect the transformer.

SF6 is used as a gaseous dielectric in high-voltage sulfur hexafluoride circuit breakers, switchgear, and other electrical equipment in the electrical industry, typically replacing oil immersed circuit breakers (OCBs) that may contain harmful polychlorinated biphenyls (PCBs). SF6 pressurized gas is used as an insulator in gas insulated switchgear (GIS) because it has much higher dielectric strength than air or dry nitrogen.

Due to its unique dielectric properties, power companies heavily rely on SF6 in the power system to achieve voltage electrical insulation, current interruption, and arc extinguishing in transmission and distribution.

When sulfur hexafluoride (SF6) is sealed inside transmission and distribution (T&D) equipment, switchgear, circuit breakers, and isolating switches can achieve insulation by extinguishing hazardous arcs. This stable and non-toxic gas has excellent dielectric strength and is a key component of power plant safety and efficiency

The full name of GIS is gas insulated metal enclosed switchgear. It is a high-voltage distribution device composed of circuit breakers, busbars, isolating switches, voltage transformers, current transformers, lightning arresters, bushings, grounding knives, and other components. GIS uses sulfur hexafluoride (SF6) gas with excellent insulation and arc extinguishing performance as the insulation and arc extinguishing medium, and seals all high-voltage electrical components in a grounded metal cylinder.

As a traditional open type distribution equipment AIS, it is in a mature stage of development in China and has certain manufacturing and operating experience. It relies on air and insulators to insulate the live parts from the ground and from phase to phase. Its busbar is exposed and directly in contact with the air. The circuit breaker can be of the ceramic column or tank type, with the ceramic sleeve as the equipment casing and external insulation. Its characteristic is that the external insulation distance is large and the floor area is large.

Service environment:

a) Air temperature: highest temperature: +40℃; lowest temperature: -25℃

b) Humidity: monthly average humidity 95%; daily average humidity 90%.

c) Altitude: Maximum installation height: 2500m

d) Obviously there is no ambient air polluted by corrosive and combustible gases, steam, etc.

e) No frequent violent shaking

Technical data

Item	Unit	Switch	Switch-fuse	Vacuum circuit-breaker
Rated voltage	kV	12	12	12
Power frequency withstand voltage	kV	28	28	28
Impulse withstand voltage	kV	95	95	95
Rated current	A	630	2001)	200
Breaking capacities:
active load	A	630
closed loop	A	670
off load cable charging	A	141
off load transformer	A		20
earth fault	A	205
earth fault cable charging	A	117
short-circuit breaking current	kA		see 2)	16
Making capacity	kA	52.5	see 2)	40
Short time current 0,5 sec	kA			16
Short time current 1 sec	kA			16
Short time current 3 sec	kA	21

1) Depending on the current rating of the fuse-link 2) Limited by high voltage fuse-links

SF6 Ring Main Unit RMU

FENGYUAN SF6

SF6

The difference between AIS and GIS

1. Different structures

GIS is characterized by a combination of phase separation, three-phase common cylinder, and composite structures in its shell structure. The development of GIS casing from phase separation to three-phase common cylinder has further miniaturized GIS. At present, the international community has achieved the simplification of all 300kV three-phase systems and the integration of 550kV busbar three-phase systems.

The layout of AIS equipment is clear, which is conducive to daily maintenance and repair by relevant personnel. The overall structure is simple, the structural form is clear, and the electrical wiring is clear, which is conducive to operation.

2. Different areas

GIS has the advantages of small footprint, small volume, light weight, and all components are sealed without environmental interference. The operating mechanism has no oiling or gasification, and has high operational reliability. GIS adopts whole block transportation, which is easy to install, short in cycle, and low in installation cost; The maintenance workload is small and the time is short. The box type GIS adopts three-phase mechanical linkage, with a low mechanical failure rate.

AIS equipment covers a wide area and has many exposed components, which are easily affected by weather factors and are not conducive to the safe operation of the equipment.

3. Superior breaking performance

The circuit breaker adopts a self-energy arc extinguishing chamber based on the new arc extinguishing principle (a hybrid structure of self-energy thermal expansion and auxiliary compressed air device), fully utilizing the energy of the arc itself. Gas insulated fully enclosed composite electrical appliances, the electrical appliances inside the enclosure mainly include circuit breakers, isolation switches, grounding switches, busbars, lightning arresters, and other primary equipment. Many switch stations in power plants and substations are made of GIS, which occupies a small area and is easy to maintain. It's still different from high-voltage switchgear.

4. Low loss and noise

The induced magnetic field on the GIS casing is very small, so the eddy current loss is very small, reducing the loss of electrical energy. The use of spring mechanism results in low operating noise. Disadvantages: GIS has the disadvantages of high price, inconvenient installation and testing, poor flexibility, and inconvenient maintenance and expansion.

AIS is relatively cheap, easy to install and test, has good flexibility, and is more convenient for maintenance and expansion.

5. Purpose

GIS performs better than AIS, but due to differences in cost and management capabilities, AIS will not completely exit for a considerable period of time. Use intelligent monitoring and diagnostic tools to extend maintenance cycles and avoid unnecessary work.

Standard

IEC 62271-100 High Voltage AC Circuit Breaker

IEC 62271-105: AC switch fuse combination

IEC 62271-102: AC current isolation switch and earthing switch

IEC 62271-200 A.C. Metal-enclosed switchgear and control equipment, rated voltage higher than 1 kV, including up to 52 kV

IEC 62271-103 high voltage switch with rated voltage higher than 1 kV and lower than 52 kV

IEC 60694: General specification for high voltage switchgear and control equipment standards

IEC 60265-1 Switches with rated voltage higher than 1 kV and lower than 52 kV

IEC 60529: Degree of protection provided by the enclosure (IP code)

Henan Fengyuan Power Technology Co., Ltd. is a diverse electric equipment manufacturer group located in Henan, China

WORKSHOP

EXHIBITION

CERTIFICATE

CQC

Products

1. Oil Filled Transformer

2. Gas insulated switchgear (GIS)

3. Cast Resin Dry Transformer

4. Pad Mounted Transformer

5. SF6 Filled Ring main Unit

6. MV Switchgear

6. LV Switchboard

7. Compact Substation

FAQ

Q1: What is your advantage?

A: We are a very famous manufacturer of power distribution products in Henan, China. We also have our own foreign trade team. We are a company integrating industry and trade

Q2: Can the product be customized according to the size I need?

A: Yes, our factory has a professional team of engineers, we can design and develop products for you according to the detailed technical parameters and specifications you need

Q3: Can we use our own logo?

A: Yes, if you have requirements, we can customize the logo you need according to your requirements

Q4: How is the quality of your products?

A: Quality is our corporate culture, and we regard product quality as the life of the company. We have obtained many certifications and can meet customs requirements. As a factory, we can 100% control all production processes, and every product will be tested and qualified before shipment.

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