Box-Type AC Fixed Ring Main Unit HV Switchgear
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Box-Type AC Fixed Ring Main Unit HV Switchgear suppliers
Box-Type AC Fixed Ring Main Unit HV Switchgear suppliers
Box-Type AC Fixed Ring Main Unit HV Switchgear
Zhejiang Tianrun Electric Co., Ltd. is one of the leading manufacturers and suppliers of box-type ac fixed ring main unit hv switchgear in China. We are committed to providing high quality customized products with competitive price. We warmly welcome you to buy bulk advanced box-type ac fixed ring main unit hv switchgear from our factory. Also, quotation is available.
Product Overview
The XGN series of box-type fixed AC metal-enclosed switchgear is designed for 3.6 kV to 40.5 kV (including 11 kV class), three-phase AC 50 Hz power systems, used for receiving, distributing, controlling, protecting and monitoring electrical energy. The entire series employs a fixed structure with vacuum circuit breakers or load-break switch–fuse combinations as the core switching elements. The XGN15 model serves as a dedicated 11 kV Ring Main Unit (RMU), featuring four-compartment metal separation and IP3X protection, ideal for urban ring-network distribution, dual-source interconnection and fault isolation. Product performance complies with IEC 62271-200 (formerly IEC 298), GB 3906, and DL/T 404.
Product Features
Compact Structure
Box-type fixed design with small footprint, suitable for installation in box-type substations.
01
Safe & Reliable
Fully metal-enclosed with compartmentalization, complete "five-prevention" interlock, and IP67 protection for gas-insulated models.
02
Maintenance-free
Low failure rate due to fixed structure; SF6 gas-insulated models feature sealed insulation and a service life of over 30 years.
03
Flexible Configuration
XGN2 (circuit breaker type), XGN15 (ring main unit), and XGN66 (compact high-breaking type) cover a wide range of scenarios.
04
Cost-effective
Lower cost than KYN draw-out switchgear, with easy installation and maintenance.
05
Type Designation
Full-Series General Parameter Range
|
Parameter Category |
Full-Series Coverage |
Remarks |
|
Rated Voltage |
3.6 kV – 40.5 kV |
12 kV class: 3.6 / 7.2 / 12 kV; 35 kV class: 40.5 kV |
|
Rated Frequency |
50 Hz |
Three-phase AC |
|
Rated Current |
630 A – 4000 A |
From 630 A terminal distribution to 4000 A high-capacity incoming |
|
Rated Short-Circuit Breaking Current |
16 kA – 40 kA |
Vacuum CB schemes; LBS-fuse schemes carried by fuses (31.5 / 40 kA) |
|
Rated Peak Withstand Current (Dynamic) |
40 kA – 100 kA |
Corresponds to breaking current at 2.5× factor |
|
Rated Short-Time Withstand Current (Thermal) |
16 kA – 40 kA |
Same value as breaking current |
|
Rated Short-Circuit Duration |
3 s – 4 s |
XGN15: 3 s; others: 4 s |
|
1 min Power-Frequency Withstand Voltage |
42 kV – 95 kV |
12 kV class phase-to-earth: 42 kV; 40.5 kV class main circuit: 95 kV |
|
Lightning Impulse Withstand Voltage (Peak) |
75 kV – 185 kV |
12 kV class phase-to-phase/earth: 75 kV; 40.5 kV class: 185 kV |
|
Secondary Circuit 1 min Power-Frequency Withstand Voltage |
2 kV |
Uniform across series |
|
Degree of Protection |
IP2X – IP3X |
Enclosure IP2X or IP3X; internal compartments IP2X |
|
Main Switching Element |
Vacuum CB / LBS-Fuse Combination |
Vacuum CB: ZN28A / ZN12 / VS1 / VD4 / VBP / EV12; LBS: FN12-12 / FZN25-12 |
|
Operating Mechanism |
Electromagnetic / Spring-Charged / Permanent Magnetic |
Electromagnetic: CD10/CD17; Spring: CT8/CT17/CT19; Permanent Magnetic: mechanical life ≥ 100,000 ops |
|
Disconnector |
GN30 Rotary / Earthing Switch |
Moving contact rotates for open/close; visible isolating gap |
|
Busbar System |
Single / Single Sectionalized / Single with Bypass / Double Busbar |
XGN2 uniquely supports all four; others support single and sectionalized |
|
Insulation Method |
Pure Air Insulation |
No phase-to-phase/earth barriers; no SF6 gas |
|
Interlocking |
Mechanical + Electrical "Five-Prevention" |
Forced interlock among CB - disconnector - earthing switch - door |
|
Applicable Standards |
IEC 62271-200 / GB 3906 / DL/T 404 |
Uniform across series |
Per-Model Parameter Comparison
|
Parameter |
XGN2-12 |
XGN15-12 |
XGN17-12 |
XGN17-40.5 |
XGN66A-12 |
|
Rated Voltage (kV) |
3.6 / 7.2 / 12 |
12 |
12 |
40.5 |
3.6 / 7.2 / 12 |
|
Rated Current (A) |
630–4000 |
630–3150 |
630 |
630–2000 |
630 |
|
Rated SC Breaking Current (kA) |
16 / 20 / 31.5 / 40 |
20 (31.5 opt.) |
Fuse 31.5 / 40 |
25 / 31.5 |
16 / 20 / 31.5 |
|
Rated Peak Withstand Current (kA) |
40 / 50 / 80 / 100 |
50 (80 opt.) |
- |
63 / 80 |
40 / 50 / 80 |
|
Rated Short-Time Withstand Current (kA) |
16 / 20 / 31.5 / 40 |
20 |
- |
25 / 31.5 |
16 / 20 / 31.5 |
|
Rated SC Duration (s) |
4 |
3 |
- |
4 |
4 |
|
1 min PF Withstand Voltage (kV) |
42 (phase-earth) |
42 / 48 (isolation gap) |
- |
95 (main circuit) |
42 (phase-earth) |
|
Lightning Impulse Withstand Voltage (kV) |
75 (phase-phase/earth) |
75 / 85 (isolation gap) |
- |
185 |
75 (phase-phase/earth) |
|
Degree of Protection |
IP2X |
IP3X |
IP2X |
IP3X / IP2X |
IP2X |
|
Operating Mechanism |
Electromagnetic / Spring |
Spring / Permanent Magnetic |
Spring |
Spring |
Spring |
|
Main Switch |
Vacuum CB |
Vacuum CB |
LBS + Fuse |
Vacuum CB |
Vacuum CB |
|
Busbar System |
Single / Sect. / Bypass / Double |
Single / Sect. / Double |
Single / Ring |
Single |
Single / Sect. |
|
Dimensions W×D×H (mm) |
1100×1200×2650 |
800/1000/1200 width |
- |
1918×3600×3100 |
900×900×2300 |
XGN-66
XGN-17
XGN-15
XGN-12
General Service Environment Conditions
|
Environment Parameter |
General Requirement |
Per-Model Variation |
|
Altitude |
Not exceeding 1000 m |
High-altitude type available by negotiation when exceeded |
|
Ambient Temperature |
-25 °C to +40 °C |
XGN2/XGN17: -5 °C to +40 °C; XGN15: -15 °C to +40 °C; XGN66: -25 °C to +40 °C |
|
Daily Temperature Variation |
Not exceeding 15 °C |
Specified for XGN2 and XGN17 |
|
Relative Humidity |
Daily avg. ≤ 95%; Monthly avg. ≤ 90% |
XGN2/XGN17: ≤ 85% (at +25 °C); XGN15/XGN66: daily ≤ 95%, monthly ≤ 90% |
|
Water Vapor Pressure |
Daily avg. ≤ 2.2 kPa; Monthly avg. ≤ 1.8 kPa |
Specified for XGN15 |
|
Seismic Intensity |
Not exceeding degree 8 |
Specified for XGN15 and XGN66 |
|
Surrounding Environment |
No conductive dust, no corrosive gases, no explosion hazard, no severe vibration/shock |
Pollution degree not exceeding Class 3 (XGN66; corresponds to IEC 60664-1 Pollution Degree 3) |
|
Vertical Inclination |
Not exceeding 5° |
Specified for XGN2 and XGN17 |
Application
- Power plants & substations: Auxiliary power distribution, critical substation double-busbar/bypass systems, small/medium substation incoming/outgoing & metering - XGN2-12, XGN15-12, XGN66A-12.
- Industrial & mining: High-capacity loads and large motor control in steel, petrochemical, cement, mining; frequent operation sites - XGN2-12, XGN15-12, XGN66A-12, XGN17-40.5.
- High-rise buildings & data centers: 10kV substation distribution, dual-source redundant power supply - XGN15-12, XGN2-12, XGN66A-12.
- Municipal & rail transit: Water/sewage plants, pumping stations, heating plants, traction substations, power/lighting distribution - XGN15-12, XGN66A-12, XGN2-12.
- Renewable energy: PV/wind collector lines, box-type transformer HV side grid connection - XN15-12, XGN66A-12, XGN17.
- Ring-network & terminal distribution: Urban RMU, residential/industrial park end-point distribution, package substations - XGN15-12, XGN17.
- Aging equipment retrofit: Direct replacement of GG-1A, XGN2 minimum-oil cubicles, no civil modification - XGN66A-12, XGN2-12.
FAQ
Q: How to choose among the four XGN series models?
A: Choose based on core requirements:
• High capacity / double-busbar / bypass: XGN2-12 (only model supporting these, up to 4000A/40kA).
• Ring-network / four-compartment / smart grid: XGN15-12 (IP3X, spring/permanent magnetic dual mechanisms).
• 35kV class / package substation / LBS scheme: XGN17 (only model covering 40.5kV).
• Space-constrained / frequent operation / oil-switch retrofit: XGN66A-12 (most compact, 40% smaller than XGN2).
Q: What is the difference between XGN series and KYN28 (withdrawable type)?
A: The main difference is the structural form:
• XGN is fixed type: CB is permanently installed, no secondary plug, protection circuits always connected, 15%–35% lower cost.
• KYN28 is withdrawable (truck) type: CB can be rolled out for easy maintenance/replacement, but carries risk of poor secondary plug contact, higher cost.
Choose XGN for high reliability requirements, limited budgets, and retrofit projects; choose KYN28 for new projects requiring CB interchangeability.
Q: Which standards does the XGN series comply with?
A: The entire series uniformly complies with:
• IEC 62271-200 (formerly IEC 298): AC metal-enclosed switchgear and control gear for rated voltages above 1kV and up to and including 52kV.
• GB 3906: AC metal-enclosed switchgear and control gear for rated voltages 3.6kV to 40.5kV.
• DL/T 404: Technical specifications for ordering indoor AC high-voltage switchgear.
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