Ring network 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.
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.
1. Material of cabinet body: 2 mm aluminum zinc plate.
2. Including side expansion, top expansion two types.
3. Internal arc duration of 630A/20kV is 1S.
4. With load switch (C), load switch + fuse combination (F), circuit breaker (V) and other standard units. Achieve a diverse set of units, to meet the complex and diverse power supply and distribution designs in different areas. SF6 ring main unit widely used in urban commercial centers, high-rise buildings, underground substations, industrial concentration areas, airports, highways and other ring or radiation power supply systems, can also be used for terminal power supply, installed in box-type substation, outdoor box-type switch station(outdoor ring cabinet) and other devices.
5. The outer material of the ring cabinet can be configured according to user's requirement.
|
NO.
|
Item
|
Unit
|
Data
|
|
Load switch
|
Combination unit
|
Breaker
|
|
1
|
Rated Voltage
|
kV
|
12
|
|
2
|
Rated
frequency
|
Hz
|
50/60
|
|
3
|
Rated current
|
A
|
630
|
125
|
630
|
|
4
|
1 min Power frequency withstand voltage
|
Phase to earth and phase to phase
|
kV
|
42
|
|
Isolating
distance
|
48
|
|
5
|
Lightning impulse withstand voltage
|
Phase to earth and phase to phase
|
kV
|
75
|
|
Isolating distance
|
85
|
|
6
|
Thermal stable current (effective value)
|
Main circuit 4S
|
kA
|
20
|
|
Earthing
switch 2S
|
|
Earth circuit 4S
|
17.4
|
|
7
|
Dynamic stable current (peak)
|
Main circuit 4S
|
kA
|
50
|
|
Earthing
switch 2S
|
|
Earth circuit 4S
|
43.5
|
|
8
|
Rated short-circuit making current（peak）
|
kA
|
50
|
|
9
|
Rated breaking current of active load
|
A
|
630
|
|
|
|
10
|
Rated closed-loop breaking current
|
A
|
630
|
|
|
|
11
|
5% Rated breaking current of active load
|
A
|
31.5
|
|
|
|
12
|
Rated
cable-charging breaking current
|
A
|
10
|
|
|
|
13
|
Rated short-circuit breaking current
|
kA
|
|
31.5
|
20
|
|
14
|
Rated transfer
current
|
A
|
|
1750
|
|
|
15
|
Mechanical life
|
times
|
5000
|
5000
|
10000
|
|
16
|
SF6 rated
pressure（20℃ gauge pressure)
|
Mpa
|
0.3
|
|
17
|
SF6 leakage rate
|
year
|
≤0.05%
|
|
18
|
IP grade
|
|
gas tank IP67
|
|
19
|
Arc test
|
|
20kA/1s
|
-
The allowable duration of arcing inside the ring main unit is 1S; the arc test inside the ring main unit reaches IAC-AB level;
-
In the corrosion resistance test (salt spray test), the spray duration reached 168h;
-
Earthing switch closing (E2 level): 20kA 5 times.
-
Enclosure protection level: enclosure IP4X, compartment IP2XC, air box enclosure (304/3mm stainless steel plate) protection level IP67;
-
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.
1. Altitude: ≤4000m (the equipment is fully insulated and sealed, applicable to high altitude areas.When the equipment is running at an altitude higher than 1000m, please make special note for pressure adjustment during manufacturing).
2. Surrounding temperature: -25 ~ +40℃ (the highest average daily temperature does not exceed 35℃).
3. Relative humidity: daily average is no more than 95%, and monthly average is no more than 90%.
4. Wind speed: no more than 35m/s.
5. Earthquake intensity: 8 degrees
6. Pollution level: level 2
7. Installation site: Without fire, explosion or violent vibration, well-ventilated and non-corrosive gas.
8. Ground slope: no more than 3°.
Note: If the use environment exceeds the above scope.Please contact us.
