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SF6 Ring Main Unit RMR-12/24N Type

12kV ,. Up to 24kV,……

Provided Customized manufacture

High reliable, compact, environmental protection…

2008/6

Best solution for your power!

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1.Company Introduce Wenzhou Rockwill Electric Co., Ltd is one of the leading high technical enterprises professional deals in medium high voltage switchgear and components develop , manufacture and sales. Located in NO.1 Fazhan Road, Wengyang Industrial Zone, Wenzhou, used to known as Yueqing Real Electric Works(Registered in 1986), registered in 2008.We have more than 20 years experiences in Medium & high voltage field. We strategically cooperate with worldwide high reputation medium & high voltage switchgear manufacturer and research institute, successfully developed series of medium voltage mutually; filled the blank in China. We also teamed up with province grade intelligence high voltage switch laboratory, together developed new generation intelligence simultaneous technical vacuum switch, electronic current transformer, digital integrated substation etc. Through the cooperation we obtain plenty achievements and build up experience technical team. Plentiful talent backup, advanced production equipment, perfect quality control system and reverse inspection procedure are powerful guarantee of our reliable product quality and high reputation. Our high reputation due to provide high quality products and service to domestic and foreign market, besides Chinese market, our products also widely sales to Middle Europe, Southeast Asia,Africa market, etc. Beside plenty products on optional,we also provide full design solution and technical support,you only need to tell us what you want, our engineer will design for you, provide whole set solution accordingly . We have always insisted the faith on grow together with customers, and to provide a safe, simply, green and efficient medium & high voltage switchgear and components

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2. Summary 2.1 General The RMR series is completely insulated SF6 Ring Main Unit, This product is in conformity with the standards the GB/IEC standard and the design of a high safety combined switch cabinets.One of the main components of circuit breaker and load break switch, high technical level, superb technology, stable performance, safe and reliable operation. RMR series SF6 Ring Main Unit will take several functional units and connecting busbar assembly in sealed SF6 gas box, without any live parts exposed, with advantages completely insulated , live parts maintenance free, small volume, compact structure, convenient operation etc. . The stainless steel plate of cabinet with 3.0mm thick , which can effectively prevent moisture, corrosion caused by salt spray; Products passed the breaking and making test, dynamic thermal stability test, sealing test and mechanical test etc, the maximum guarantee the safety of persons and equipment. The cabinet is suitable for indoor and outdoor installation, and it is not affected by the external environment, with high performance of anti harsh environment RMR series SF6 Ring Main Unit is widely used in industrial and civil ring network distribution system and power supply terminal, especially suitable for small Secondary distribution substation, urban residential district, and other places 2.2 Standards and specifications 2.2.1 Switchgear manufacture The switchgear complies with the following specifications in accordance with relevant IEC publications: ----IEC62271-200 ----IEC62271-100 ----GB3804-2004 ----GB3906-1991 ----GB16926-1997 ----GB/T11022-1999 2.3 Operating conditions 2.3.1 Normal operating conditions Design to relevant standard, with the following limit values: a)Air temperature: ±40 ; Daily average ≤25°C℃ b)Altitude above sea level: Maximum installation altitude: 4000m c)Wind: less than 35m/s;

d)Earthquake intensity: no more than 8 degrees;

3. Main new advantages of RMR 3.1 The SF6 gas tank feature: RMR use SF6– gas (Sulphur hexafluoride) as insulation and quenching medium.

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The SF6 is contained in a welded stainless steel tank, which is sealed for life.The pressure system is defined as a sealed for life system with an operating life time exceeding 30 years. The leakage rate is less than 0.1% per year. In order to ensure a reliable and tight welding, all welding work is carried out by computer controlled robots. Electrical and mechanical bushings penetrating the tank are clamped and sealed to the tank by high quality O-rings.

The mechanical bushing has in addition a rotating shaft which connects the shaft of the switch to the corresponding shaft of the mechanism. The rotating shaft is sealed by a double set of gas seals. All SF6-tanks have to pass a leakage test before gas fill-ing. Leakage test and gas filling are done inside a vacuum chamber. The first step in the leakage test is to evacuate all air inside both SF6-tank and vacuum chamber simultaneously. Then the SF6-tank is filled with Helium. Due to the characteristics of Helium this test will detect all possible leakages. If the SF6-tank passes this test, the Helium will be evacuated and replaced by SF6.The SF6-tank has a degree of protection of IP65 and can be immersed into water and still maintainable functions in a satisfactory way.

4.Primary schemas and layout sheet 4.1 Main indoor application schemas & layout application

Combination CCC Combination VVV

Note: All above combination dimension is same: 1020×750×1345mm.

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Combination CVC/CCV/CVV/VCV Combination CCF/CFC/CFF/FCF/CCF

Note: All above combination dimension is same: 1020×750×1345mm. 4.2 Special required indoor application schemas & layout application

Combination CFV Combination CFF/FFF

Note: If any special required to adding additional panels like: C,F,V, or metering unit , cable connector, please consult with us before order.

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5. Standard module function and dimension Type Type function Width(mm)

C Load break switch 325 F Switch-fuse combination 325

V/CB 3-position switch+VCB 325 M Metering module 700 Sv Bus bar section +VCB 650

Rest unit dimension is same: 325mm

Note: All above combination dimension is same: 1020×750×1345mm.

6. Extension type with bushing

F + Side-extension bushing V + Side-extension bushing C + Side-extension bushing

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7. Technical Parameters No Item Unit Data

1 Rated voltage 12/24

Dry Power Frequency withstand voltage

Wet 42/50

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Lightning Impulse withstand Voltage (peak value)

kV

75/65

3 Rated Current A 630/1250

4 Rated short circuit breaking current (peak) kA 20

5 Rated closed-loop breaking current A 630/1250(C)

6 Rated cable charging interrupting current A 50(C)

7 Rated line cable charging interrupting current A 10(C)

8 Rated off circuit transformer breaking current A 16

9 Rated making current (peak)

10 Rated withstand current (peak)

50/2.5(main switch/grounding)

11 Rated short time withstand current

kA

16/20

12 Rated short time withstand time S 3/4

13 Mechanical life times C/F（2000）V(10,000)

14 Main busbar A 630/1250

14 SF6 rated pressure (20℃) MPa 0.014

15 SF6 Annual leakage rate % ≤0.05

16 Secondary circuit rated power voltage kV 2

17 Secondary citcuit 1min power frequency voltage V AC220/DC48/DC24

18 Enclosure IP65

19 Protection degree

Cabinet and operation mechanism

IP3X

Note: If any special required please consult with us before order. For example: 1, High current 1250A. 2, Big breaking current; 3, Higher insulation. Etc.

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8. Switch Device Wide selection of reliable quality switching products are avaiable,the load break switch,vaccum circuit breaker. 10.1 Load break switch The load break switch is a 3-position switch disconnector and earthing switch using SF6 gas as an arc quenching meduim,the switch positioning is close-open-earthed. In the open position the switch satisfies the disconnector requirements.

3-position load break switch (closed,open,and earthed) Spring mechanism consists of single spring action, double spring operating mechanism. Among them, the double spring operating mechanism used in switchgear unit, can realize the automatic tripping trip.

10.2 Vacuum circuit beaker

RMR Vacuum circuit breaker has vacuum bottles as interrupters of the current.In series with the circuit-breaker main circuit is connected a 3-position disconnector/earthing switch. The operation between vacuum circuit breaker and disconnector/earthing switch is mechanically interlocked. Compact, simple structures and safe operation.

10.3 Fuse By means of tripping device it operates as a switch-fuse combination. Two earthing switches are equipped in both sides of the fuse-links in order to ensure the personal safety of operators. Both earthing switches are operated in one operation. The switch-fuse and earthing switch is mechanically interlocked to prevent unauthorized access to the fuse-links. The lower cover which gives access to the fuse-link is also mechanically interlocked with the earthing switch. The fuse holder is sealed tightly,so it is anti electirc dust and moisture. Note: Fuse selection for transformer protection selection refer to IEC fuse standard.

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11. The accessories 11.1Gas pressure/density meter

Density meter with Low voltage pressure alarm General density meter Each tank of RMU is equipped with density meter to monitor the gas pressure inside. The pointer of the meter is in the green area, that means the normal pressure in the gas tank, if the pointer is in the red zone, it means the pressure of the tank is low. It is required to periodically inspect the density meter, to ensure the pressure in the normal range. Additionally, density meters with low pressure alarm is also available as an option. The meter is provided as the customer specified. 11.2 Type C Bushing

The connection of the HV-cables is made by cable Type C bushings. See right side pictute. The Type C bushings are made of cast resin epoxy with moulded-in conductors. This C type is used together with full-screened elbow cable connectors which is an ideal solution for areas with humidity or condensation problems is achieved.

11.3 Voltage indicator

Each unit is equipped with voltage indicator with phase check outlet,which feature: Stable performance, High brightness, Wide viewing angle,long life.

11.4 Fault indicator

Fault indicator is provided as an option Fault indicator for detection of a short circuit, single phase earth fault. Accurate detection and clear indication.

Note: Above components of RMU is standard equipped, any special requirement pls consult us.

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11.5 CT/Zero sequence CT CT/Zero sequence CT are provided according to the customer’s requirement. a.Installed on external bushings when need. CT should be earthed reliable,and open circuit of secondary side is not allowed,or it will lead to severe damage to the equipment and even dangers to the individuals. 11.6 Elbow cable connector and relevant accessories -Frontal Elbow Cable connectors -Copper conductors -Press cores -Copper lugs -Additional back cable connector optional -Additional elbow connector type surge arrester

11.7 Operating Handle

The operating handle has two sides,for both Load break switch,circuitBreaker,and earthing switch manual operation,

11.8 Protection relay RP260 protection device is numerical protection relay with self-powered. -OC/EF protection -Fault report -UV/OV protection -Frequency protection -Other required is discussable

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12. Dimension of Outdoor application RMU

Note: Above is dimension for three unit combination, all the dimension about CCC, FFF,CCV, VVV, CVV, CFV, FFV, CCF is same.

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13. Extension way by top connection

For normal Ring main unit combined by three unit together, above picture reference is shown us. If special required more, pls consult us.

14. Technical service Rockwill,China. Provide with best support, If you have any question pls consult below. Rockwill, CHINA. Tel: 0086-577-27869968 Rockwill, CHINA. Email: Rockwell@rockwill.cn