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China DR-XGN-24 KV Ring Main Unit - Reliable Suppliers and Factory for Metal Closed Switchgear Solutions
Model meaning
Normal service condition
Altitude
≤1000m
Maximum ambient temperature
+40℃
Minimum ambient temperature
-35℃
Maximum daily temperature difference
25K
Daily average relative humidity
≤95%
Monthly average relative humidity
≤90%
Earthquake resistance
level 8
System rated frequency
50Hz
SF6 leakage rate
≤0.1%
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
DR-XGN□-24 Primary system diagram (DC01)
DR-XGN□-24 Primary system diagram (DC08)
DR-XGN□-24 Primary system diagram (DC01 Alt)
DR-XGN□-24 Primary system diagram (DC08 Alt)
| Primary plan number | DC01 | Primary plan number | DC08 |
|---|---|---|---|
| Main bus TMY-3(40×8) | DR-XGN□-24 Primary system diagram | Main bus TMY-3(40×8) | 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)
Q:
What are the normal environmental service conditions for this ring switchgear?
The equipment is designed to operate at altitudes ≤1000m, with ambient temperatures ranging from a maximum of +40℃ to a minimum of -35℃. The maximum daily temperature difference should not exceed 25K, and the daily average relative humidity must be ≤95% (monthly average ≤90%). It also features earthquake resistance up to level 8.
Q:
What is the rated voltage and SF6 leakage rate of this equipment?
This SF6 Ring Switchgear has a rated voltage of 24kV (suitable for 20kV systems) and features an extremely low SF6 leakage rate of ≤0.1% per year.
Q:
How does this switchgear improve the substation and distribution line capabilities?
It increases the main transformer capacity, improves the substation's power supply capacity, enhances the power transmission capacity of distribution lines (reducing the overall number of lines needed), and increases the power supply radius of medium voltage lines.
Q:
What is the enclosure protection class and mechanical life of the switches?
The enclosure protection class is rated at IP3X. The load switch has a mechanical life of 3000 operations, while the ground switch has a mechanical life of 2000 operations.
Q:
What are the physical dimensions of the standard cabinet layout?
For both incoming (DC01) and outlet (DC08) cabinet schemes, the standard physical dimensions are 650mm in width, 1200mm in depth, and 2000mm in height.
Q:
What components are configured in the DC01 and DC08 primary schemes?
The DC01 incoming cabinet is equipped with one FLN□-24D load switch, one DXN-T/Q live display, and three HY5WS-33/85 lightning arresters. The DC08 outlet cabinet features one FLRN□-24D load switch, one DXN-T/Q live display, three JDZ-24 voltage transformers, and three XRNT-24/□A fuses. Both schemes support manual operation.