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24kV Ring Main Unit DR-XGN-24 - China Suppliers and Factory for Metal Closed Switchgear Solutions
Model meaning
Normal service condition
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Altitude: ≤1000m
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Maximum ambient temperature: +40℃
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Minimum ambient temperature: -35℃
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Maximum daily temperature difference: 25K
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Daily average relative humidity: ≤95%
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Monthly average relative humidity: ≤90%
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Earthquake resistance: Level 8
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System rated frequency: 50Hz
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SF6 leakage rate: ≤0.1%
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Enclosure protection class: IP3X
Main feature
- Increase the main transformer capacity and improve the power supply capacity of the substation.
- Improve the power transmission capacity of distribution lines and reduce the number of distribution lines.
- Increase the power supply radius of the medium voltage line.
This voltage level earlier in a small area trial operation, by the requirements of the State grid company, by Jiangsu provincial pilot promotion of 20kV voltage level, now the southern network is also ready to start promoting 20kV voltage level in Guangdong and other places, it can be predicted that the final 24kV equipment will dominate the market.
Main technical parameters
| Item | Unit | 20kV SF₆ Ring switchgear | ||
|---|---|---|---|---|
| Rated voltage | kV | 24 | ||
| Rated frequency | Hz | 50 | ||
| Rated current | A | 630A≤100 (Load switch-fuse combination cabinet) | ||
| Rated short-circuit breaking current | kA | 31.5 | ||
| Rated closing current (peak) | kA | 50 | ||
| Rated heat stable current | kA/3S | 20 | ||
| Rated dynamic stable current (peak) | kA | 50 | ||
| Insulation level | Power frequency withstand voltage | Phase to phase and ground to ground | kV/1min | 65 |
| Fracture | kV/1min | 79 | ||
| Lightning impulse withstand voltage | Phase to phase and ground to ground | kV | 125 | |
| Fracture | kV | 145 | ||
| Rated active load breaking current | A | 630 | ||
| Rated cable charging breaking current | A | 25 | ||
| Main loop resistance | μΩ | ≤300 | ||
| Kinetic function | Spring type: DC/AC 220V/48V | |||
| Rated transfer current | A | 1400 | ||
| Mechanical life | Load switch: 3000; Ground switch: 2000 | |||
Primary scheme
| Primary plan number | DC01 | Primary plan number | DC08 |
| Main bus TMY-3(40×8) |
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Main bus TMY-3(40×8) |
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| DR-XGN□-24 Primary system diagram | DR-XGN□-24 Primary system diagram | ||
| Disposition | Incoming cabinet | Disposition | Outlet cabinet |
| Load switch FLN□-24D | 1 | Load switch FLN□-24D | |
| Load switch FLRN□-24D | Load switch FLRN□-24D | 1 | |
| Live display DXN-T/Q | 1 | Live display DXN-T/Q | 1 |
| The current transformer | The current transformer | ||
| Fuse XRNP-24/□A | Fuse XRNP-24/□A | ||
| Voltage transformer JDZ-24 | Voltage transformer JDZ-24 | 3 | |
| Lightning arrester HY5WS-33/85 | 3 | Lightning arrester HY5WS-33/85 | |
| Fuse XRNT-24/□A | Fuse XRNT-24/□A | 3 | |
| Measuring instrument | Measuring instrument | ||
| Protection mode | Protection mode | ||
| Auxiliary function | Auxiliary function | ||
| Mode of operation | Manual operation | Mode of operation | Manual operation |
| Cabinet width x Depth x height(mm) | 650×1200×2000 | Cabinet width x Depth x height(mm) | 650×1200×2000 |
| Primary plan number | DC01 | Primary plan number | DC08 |
| Main bus TMY-3(40×8) |
|
Main bus TMY-3(40×8) |
|
| DR-XGN□-24 Primary system diagram | DR-XGN□-24 Primary system diagram | ||
| Disposition | Incoming cabinet | Disposition | Outlet cabinet |
| Load switch FLN□-24D | 1 | Load switch FLN□-24D | |
| Load switch FLRN□-24D | Load switch FLRN□-24D | 1 | |
| Live display DXN-T/Q | 1 | Live display DXN-T/Q | 1 |
| The current transformer | The current transformer | ||
| Fuse XRNP-24/□A | Fuse XRNP-24/□A | ||
| Voltage transformer JDZ-24 | Voltage transformer JDZ-24 | 3 | |
| Lightning arrester HY5WS-33/85 | 3 | Lightning arrester HY5WS-33/85 | |
| Fuse XRNT-24/□A | Fuse XRNT-24/□A | 3 | |
| Measuring instrument | Measuring instrument | ||
| Protection mode | Protection mode | ||
| Auxiliary function | Auxiliary function | ||
| Mode of operation | Manual operation | Mode of operation | Manual operation |
| Cabinet width x Depth x height(mm) | 650×1200×2000 | Cabinet width x Depth x height(mm) | 650×1200×2000 |
Overall dimension
Frequently Asked Questions (FAQ)
What is the rated voltage and frequency of this SF6 Ring Switchgear?
The equipment has a rated voltage of 24kV and operates at a system rated frequency of 50Hz.
What are the environmental limits for installing this switchgear?
It is designed to operate at altitudes ≤1000m, within an ambient temperature range of -35℃ to +40℃, and a maximum daily temperature difference of 25K.
What is the enclosure protection class and SF6 leakage rate?
The enclosure protection class is IP3X, and it maintains a highly secure SF6 gas leakage rate of ≤0.1% annually.
How does the 24kV equipment improve power transmission?
It increases the main transformer capacity, improves the substation's supply capability, enhances transmission capacity of distribution lines, and extends the power supply radius of medium voltage lines.
What is the mechanical life expectancy of the load switch and ground switch?
The load switch has a mechanical life of 3000 operations, while the ground switch is rated for 2000 operations.
What are the dimensions and operation modes of the cabinets?
The typical cabinet dimensions are 650mm (Width) x 1200mm (Depth) x 2000mm (Height), and they support manual operation modes.