Ring main unit
Standard Specification
【Summary】
Ring network switchgear is mainly used for the incoming and outgoing lines of loop and radiation distribution in the distribution system of 24 kV and below. It is widely used in the cable splitting, disconnection and multi-power point connection, as well as the control and connection of the incoming and outgoing lines of underground cable and overhead .
【Model Description of Ring Network】
【Usage environment】
|
Serial number |
project |
numerical value |
|
1 |
Altitude |
≦1000m |
|
2 |
ambient temperature |
-25℃- +40℃ |
|
3 |
Maximum wind speed |
≦30m/s |
|
4 |
relative humidity |
≦95% |
|
5 |
Seismic capacity |
≦8grade |
|
6 |
Dirt grade |
≦IIIgrade |
|
7 |
Installation environment |
Places free from fire, explosion, corrosive gases and violent vibration |
|
8 |
Remarks |
If the use environment is not included in the list, please provide written instructions to our company. |
【Structural characteristics】
SF6 gas insulated arc extinguishing, sealed with stainless steel box, light in volume, light in weight, maintenance-free, can be used in harsh environment;
The unique pressure-air (rotary) load switch has the advantages of low inflatable pressure, large interruption capacity and long service life.
The operation state of main switch and grounding switch can be clearly observed by using the observation window with a diameter of 100 mm.
It is equipped with a density meter to monitor the gas pressure inside the box and an explosion-proof pressure relief device to ensure safe operation and operation.
Fuse protection, any phase fuse can be fused by pre-stored energy in the operating mechanism to make the load switch off;
The main switch and the grounding switch are mechanically interlocked, and the grounding switch operating mechanism and the fuse door are mechanically interlocked, so the operation is safe and reliable.
Distributable electric operation mechanism to realize the functions of distribution automation such as "three remote" and so on.
The cable connector achieves fully sealed, fully insulated and fully shielded structure.
Easy to install and operate.
Fully insulated, fully sealed structure, resistance to harsh environmental conditions, moisture, flood, pollution, corrosive gases, steam, dust and small animals, etc.
The strict quality management system has passed the ISO 9001 certification and the inspection by China"s authoritative testing institutions.
【Main components】
Three-position SF6 load switch (direct-acting and rotary) has three working states: closing, opening and grounding (optional). The operation mechanism has strict function of preventing misoperation. SF6 gas is used as arc-extinguishing medium, and the switch housing is equipped with a fracture observation window. The switch is equipped with live display showing live state. Operating mechanism can be electrically operated and manually operated. Outgoing circuit can be protected by appropriate type of fuse, which has long service life and 30 years maintenance-free.
【 Technical parameters of load switch】
|
Serial Number |
Parameter name |
unit |
numerical value |
|
|
1 |
Rated voltage |
kV |
12 |
24 |
|
2 |
Rated current |
A |
630 |
630 |
|
3 |
Rated power |
Hz |
50 |
50 |
|
4 |
Rated Active load breaking current |
A |
630 |
630 |
|
5 |
Rated closed open current |
A |
630 |
630 |
|
6 |
Rated Cable Charging Open-Out Current |
A |
10 |
10 |
|
7 |
Rated power frequency withstand voltage inter-phase/ground/fracture |
kV |
42/48 |
65/79 |
|
8 |
Rating Lightning Impulse Tolerance Voltage Interphase/Ground/Fracture |
kV |
75/85 |
125/145 |
|
9 |
icw |
kA |
20 |
20 |
|
10 |
Rated short circuit duration |
S |
4 |
4 |
|
11 |
Rated peak tolerable current |
kA |
50 |
50 |
|
12 |
Rated short circuit switching current (peak value) |
kA |
50 |
50 |
|
13 |
Mechanical life |
次 |
5000 |
5000 |
|
14 |
Average closing speed (arc extinguishing chamber) |
m/s |
>4 |
>4 |
|
15 |
Average Switching Speed (Arc Extinguishing Chamber) |
m/s |
>4 |
>4 |
|
16 |
Isolation fracture opening |
mm |
>50 |
>50 |
|
17 |
Main circuit resistance |
µΩ |
≦200 |
≦200 |
【Internal circuit breaker】
The protection of transformer or line by circuit breaker can be realized by using universal current transformer as the signal source, and the protection modes can be varied.
According to the user"s needs, the circuit breaker can choose permanent magnet or spring operating mechanism, which can be realized by both manual and electric modes at the same time. By installing external operating power supply, various uninterrupted protection and monitoring can be realized, which is convenient, safe and reliable to operate.
【Technical parameters of circuit breaker】
|
Name of parameter |
Company |
parameter values |
|
|
Rated voltage |
kV |
12 |
24 |
|
Rated lightning impulse voltage |
kV |
75(相间、相对地)/85（断口） |
125(相间、相对地)/145（断口） |
|
Rated short-term power frequency withstand voltage |
kV |
42(相间、相对地)/48（断口） |
65(相间、相对地)/79（断口） |
|
Rated frequency |
Hz |
50 |
50 |
|
Rated short-time interruption current |
kA |
20 |
20 |
|
Rated current |
A |
630/1250 |
630/1250 |
|
Rated short circuit duration |
S |
4 |
4 |
|
Icw |
kA |
20 |
20 |
|
Rated peak tolerable current |
kA |
50 |
50 |
|
Rated short circuit switching current (peak value) |
kA |
50 |
50 |
|
Power frequency withstand voltage of secondary circuit (1 min) |
V |
2000 |
2000 |
|
Operation sequence |
|
off-0.3S-on/off-180S- on/off |
off-0.3S-on/off-180S- on/off |
|
Rated single back-to-back capacitor bank turn-off current |
A |
400 |
400 |
|
Mechanical life |
次 |
10000 |
10000 |
|
Rated number of short circuit breaking current |
次 |
30 |
30 |
|
Rated switching voltage |
V |
AC：110/220 DC：110/220 24/48 |
AC：110/220 DC：110/220 24/48 |
|
Voltage of Energy Storage Motor |
V |
AC：110/220 DC：110/220 24/48 |
AC：110/220 DC：110/220 24/48 |
|
Different Periods of Three-Phase Shut-in and Shut-in |
mS |
≦2 |
≦2 |
|
Main circuit resistance |
µΩ |
≦60（630A） ≦50（1250A） |
≦60（630A） ≦50（1250A） |
【Main Scheme and Outward Size】
