SF₆ Gas-Insulated Ring Main Unit
Featuring a fully modular design with 20 years of maintenance-free operation, it offers flexible modular expansion and safe, reliable performance, driving the automation upgrade of distribution networks.
Product Description
The HXGN-type SF₆ gas-filled fully-insulated ring main unit is suitable for distribution lines and widely applied in urban power supply ring networks and terminal power supplies. It is especially applicable to small secondary distribution substations, switching stations, industrial and mining enterprises, urban residential quarters, airports, railways, tunnels, high-rise buildings, and other power systems to receive and distribute electrical energy.
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Product Advantages
Safety
Featuring a fully enclosed design to prevent accidental contact and satisfy mechanical interlocking requirements.
Scalability
The modular design allows for the addition of various functional units as needed. Different units can be combined arbitrarily into an RMU, saving investment costs.
Easy Upgradability
Convenient for upgrading distribution network automation functions.
Reliability
All high-voltage live parts and components are sealed within a stainless steel enclosure filled with SF₆ gas to achieve full insulation, full sealing, and full protection. The enclosure surface is electrostatically sprayed, making it corrosion-resistant and anti-aging.
Cost-Effectiveness
The product has a long service life, and the enclosure is maintenance-free for 20 years, which greatly reduces customers' operation and maintenance expenses.
SF₆ Gas-Insulated Ring Main Unit
HXGN-12
Product Parameter Table
| Item | Value | |||||||
| 12KV Load Switch | 12KV Combined Apparatus | 12KV Circuit Breaker | 17.5KV Circuit Breaker | 40.5KV Load Switch | 40.5KV Combined Apparatus | 40.5KV Circuit Breaker | ||
| Rated Voltage kV | 12 | 12 | 12 | 17.5 | 40.5 | 40.5 | 40.5 | |
| Rated Current A | 630 | 125 | 630 | 200 | 630 | 100 | 630 | |
| Rated Frequency Hz | 50 | 50 | 50 | 60 | 50 | 50 | 50 | |
| Rated Short-Circuit Breaking Current kA | 31.5 | 20 | 21 | 20 | ||||
| Rated Transfer Current | 1750 | 750 | ||||||
| Rated Power-Frequency Withstand Voltage for 1 min | Phase-to-Phase/Phase-to-Ground kV | 42 | 42 | 42 | 38 | 95 | 95 | 95 |
| Across Open Contact kV | 48 | 48 | 48 | 45 | 118 | 118 | 118 | |
| Rated Lightning Impulse Withstand Voltage Peak | Phase-to-Phase/Phase-to-Ground kV | 75 | 75 | 75 | 95 | 185 | 185 | 185 |
| Across Open Contact kV | 85 | 85 | 85 | 110 | 215 | 215 | 215 | |
| Rated Short-Time Withstand Current and Duration kA/s | 20/4 | 20/4 | 21/1 | 20/3 | 20/3 | |||
| Rated Peak Withstand Current kA | 50 | 50 | 54.6 | 50 | 50 | |||
| Rated Short-Circuit Making Current kA | 50 | 50 | 54.6 | 50 | 50 | |||
| Mechanical Life times | 5000 | 5000 | 20000 | 10000 | 5000 | 10000 |
DTU Technical Specifications
| Item | Configuration |
| Power Supply | AC/DC220V + Backup Power Supply |
| AC/DC110V + Backup Power Supply | |
| Maximum Monitoring Capacity | Digital Input Channels: 105 |
| AC Analog Input Channels: 56 | |
| DC Analog Input Channels: 2 | |
| Digital Output Channels: 34 | |
| Line/Switch Monitoring Quantity: 16 | |
| Communication Interfaces | 2 Ethernet Ports, 4 RS232/RS485 Ports |
| DLT634.5101, DLT634.5104, ModBUS, DNP3.0 | |
| Relay Protection | Phase-to-Phase Short Circuit and Single-Phase Ground Fault Monitoring |
| Three-Stage Three-Phase Overcurrent and Two-Stage Zero-Sequence Overcurrent, Reclosing, Post-Acceleration | |
| Fault Recording | Sampling Frequency: 6.4KHz, 1128 Points/Cycle |
| Configurable Number of Cycles, Comtrade 1999 Standard Format | |
| Historical Data Storage | Event Sequence Recording |
| Remote Control Operation Recording, Load Curve | |
| Fixed Point and Extreme Value Recording, Fault Recording Records | |
| Information Security | Dedicated Security Chip Hardware Encryption |
| X.509 Standard Format SM2 Digital Certificate | |
| Performance Indicators | Analog Accuracy: Voltage/Current 0.5%, Others 1% |
| Communication Resolution: 2ms |
Product Dimensions and Packaging
| Name | SF6 Insulated Ring Main Unit (Example: Three-Compartment Combined Cabinet) |
| Equipment Dimensions | 1500*1100*2000 |
| Packaging Method | Wood-Steel Edge Box |
| Packaging Dimensions (mm) | 1900*1500*2200 |
| Packaging Weight (kg) | 650 |
| 20ft Container Capacity L*W*H:5.89*2.39*2.69m | 3 |
| 40ft Container Capacity L*W*H:12.03*2.35*2.69m | 7 |
