HXGN 囗-12 AC Metal Enclosed Ring Network Switchgear
HXGN-12 AC Metal-Enclosed Ring Network Switchgear is designed for closed-loop distribution networks to significantly enhance power supply reliability through multi-source interconnection. In the event of a localized line fault, the Metal-Enclosed Ring Network Switchgear(RMU) quickly isolates the issue and switches the power supply to an alternative path, ensuring uninterrupted power delivery to downstream users.
- Product Introduction
HXGN-12 AC Metal-Enclosed Ring Network Switchgear is designed for closed-loop distribution networks to significantly enhance power supply reliability through multi-source interconnection. In the event of a localized line fault, the Metal-Enclosed Ring Network Switchgear(RMU) quickly isolates the issue and switches the power supply to an alternative path, ensuring uninterrupted power delivery to downstream users.
Internal Structure
The above drawings are only schematic diagrams of internal structures, and the final design shall be subject to the contractual drawings.
Key Features
1
Advanced Switchgear Integration
Equipped with an FZN-12D vacuum load break switch featuring a dual-option (manual/motorized) spring-operated mechanism.
2
Manual Controls
Isolation blades and grounding switches are operated via robust manual mechanisms.
3
Compact, Integrated Design
Maximizes space efficiency with a minimal footprint.
4
Maximum Safety
Zero risk of fire or explosion.
Model Number Explaination
Box-type ring main unit
Fixed type
Indoors
Design serial number
Rated voltage (kV)
SF6 load break switch
Technical parameters
|
Item |
Unit |
Parameter |
|||||||||
|
Rated voltage |
kV |
12 |
|||||||||
|
Rated
frequency |
Hz |
50 |
|||||||||
| Main busbar rated current/Max. Fuse Rated Current |
A |
630,125 |
|||||||||
| Rated Short-Time Withstand Current (Iₜₕ) – Main & Earth Circuits |
kA/s |
20,3 |
|||||||||
|
kA |
50 |
||||||||||
| Rated Short-Circuit Making Current (Iₘₐ) – Main & Earth Circuits |
kA |
50 |
|||||||||
| Switch Breaking Capacity / Times of Operations |
Times |
100 |
|||||||||
| Fuse breaking current (Iₙ) |
kA |
31.5,40 |
|||||||||
| Rated closed-loop breaking current |
A |
630 |
|||||||||
|
Rated transfer current (Iₜᵣ) |
A |
1600 |
|||||||||
|
Mechanical life |
Times |
2000 |
|||||||||
| Power frequency voltage (peak)/1min |
Earth to ground and phase to phase |
kV |
42kV/min |
||||||||
|
Isolation fracture |
48kV/min | ||||||||||
| Lightning impulse voltage (peak)/1min |
Earth to ground and phase to phase |
kV |
75kV/min |
||||||||
|
lsolation gap |
85kV/min | ||||||||||
| Secondary circuit power frequency voltage /1 min |
kV |
2 | |||||||||
|
Protection grade |
IP3X |
||||||||||
Product Test
Power Frequency Withstand Voltage Requirements for HV Switchgear (12kV System)
| Test Location | Withstand Voltage | Test Condition | Key Considerations | Failure Analysis |
|---|---|---|---|---|
| Ground | 42kV/1min | Phase conductor → grounded enclosure | Verifies insulation strength during single-phase ground faults | May cause enclosure breakdown or protection malfunctions |
| Phase-to-Phase | 42kV/1min | A-B/B-C/C-A phases | Ensures reliability during phase-to-phase faults or load imbalance | Can lead to phase short circuits and system collapse |
| Isolation Gap | 48kV/1min | Open contacts (separated) | Evaluates ability to withstand system overvoltages (e.g., switching surges) when open | Risks contact reignition or insulation flashover |
Failure Mode Analysis
| Test Location | Common Causes | Mitigation Measures |
|---|---|---|
| Ground | Contaminated insulators/partial discharge | Regular cleaning, SF₆ gas purity checks |
| Phase-to-Phase | Aged insulating barriers/mechanical deformation | Use flame-retardant epoxy barriers |
| Isolation Gap | Contact erosion causing field distortion | Monitor arcing energy, replace co |
Usage Conditions
① Ambient temperature: -25℃ to +40℃
② Altitude:≤ 2000m
③ Relative humidity:daily average is not more than 95%;The monthly average is not more than 90%;
④ Surrounding environment: The surrounding air is not significantly polluted by corrosive gases or flammable gases,water vapor,etc.
⑤ No frequent violent vibration.
Application and Maintenance
Application Scenarios
Maintanance Tips
Maintanance Tips
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1
- Check the mechanical characteristics and insulation resistance of the switch every year.
2
- Regularly clean the cabinet and tighten the connecting parts
3
● The SF6 switch needs to have its gas pressure checked (if applicable)
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