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Gas all-insulated ring main unit RN8-12(24)

Product Description:

RN8 gas insulated ring main unit (referred to as RN8 ring main unit) is a complete indoor distribution device with three-phase AC 50Hz. It is a new generation of shared gas insulated switchgear in China. Its technology draws on the advantages both domestically and internationally, and meets the requirements of domestic users in terms of insulation. The RN8 ring main unit is equipped with internationally advanced SF6 load switches or circuit breakers.

The RN8 ring main unit uses SF6 gas as the insulation and arc extinguishing medium. SF6 gas has strong electronegativity, high dielectric strength, and its insulation strength is 2-3 times that of air. SF6 gas is non-toxic, odorless, non-flammable, and non-explosive. It has excellent arc extinguishing and insulating performance, allowing load switches/circuit breakers to quickly extinguish arcs after breaking the current. The internal design of the unit is compact and small to save space. The gas box is weld with stainless steel and fully sealed. The operating mechanism adopts spring type with a simple structure and flexible operation, and the operating speed is not affected by the manpower. The mechanism has complete mechanical locking and reliable interlocking. With modular design, it can be flexibly combined into various distribution schemes to meet the needs of different users.

At the same time, in order to meet the needs of development of power grid and reduce the initial cost of investment, the company has developed an expandable RN8 ring main unit with reserved expansion interfaces for users.


combination circuit breaker

Technical parameter: 

No.

Component name

Unit

Technical parameter

Load switch

GIS

circuit breaker

Load switch

GIS

circuit breaker

1

Rated voltage

KV

12

24

2

Rated frequency

Hz

50

3

Rated current of the main bus

A

630

4

Rated current

A

630

125

200

630

80

200

630

630

5

Rated short-circuit breaking current

kA


31.5

20


31.5

16

6

Rated transfer current

A


2200



1400


7

Rated short-circuit duration

s

3

8

Rated short-time tolerant current (effective value)

kA

20


20

20


20

9

Rated peak tolerant current

kA

20


50

20


50

10

Load switch and grounding switch
Rated short-circuit making current (peak value)

kA

50


50

50


50

11

1min power-frequency withstand voltage

phase-phase, phase-earth

kA

42

50(65)

Isolation fracture

48

64(79)

12

Lightning impulse withstand voltage

phase-phase, phase-earth

kA

75

95(125)

Isolation fracture

85

110(145)

13

Rated Active load breaking current

A

630

14

Rated closed-loop breaking current

A

630

15

Rated no-load transformer breaking current

A

16

15

16

Rated cable-charging breaking current

A

30

25

17

Mechanical life

次

5000

18

SF6 gas Rated pressure gauge

MPa

0.02

0.03

19

Annual leakage rate of SF6 gas


≤0.5%

≤0.1%


Technical features and advantages:

1. The main components and springs of the mechanism are made of imported materials, ensuring reliable operation. The operating life of the load switch and circuit breaker reaches 5000 times.

2. Injection molding parts and sealing parts are advanced in processing technology, and have been strictly tested. Their service life is ≥30 years.

3. Advanced equipment such as ABB automatic welding robots and Leyboll helium leak detection system are used to ensure that the annual relative leakage rate of SF6 gas is ≤ 0.1%.

4. By using vacuum dehumidification technology, the moisture content of SF6 gas can be controlled within ≤ 150ppm.

5. The three-station straight-barrel blowing load switch can easily break 2200A current in combined electrical unit applications.

6. The inflation pressure is low, and the instrument pressure is 0.02MPa. And under zero gauge pressure rated operating conditions, the switchgear can operate normally and achieve rated current opening and closing 10 times.

7. The circuit breaker adopts the three-station air-blown arc extinguishing and magnetic spinning arc extinguishing integrated arc extinguishing chamber. The breaking and isolation functions are carried out simultaneously

8. Humanized and visible grounding system. The opening and closing status of the grounding switch can be clearly observed through a transparent observation window.