FL(R)N36 Indoor AC High Voltage SF6 Load Break Switch and LBS-Fuse Combination
The FL(R)N36 Indoor AC High Voltage SF6 Load Break Switch and LBS-Fuse Combination are designed for use in three-phase AC 50/60Hz RMUs (Ring Main Units) and terminal power stations. These switches are suitable for protecting power systems operating at 10kV, 24kV, and 35kV under on-load conditions. They are capable of interrupting on-load current, closed-loop current, no-load transformer capacity, and cable charging current. When equipped with a fuse combination, they can cut off any current within the range of the rated short-circuit breaking current. These devices find application in RMUs and combined transformers, among others.
Description
FL(R)N36 Indoor AC High Voltage SF6 Load Break Switch and LBS-Fuse Combination
The FL(R)N36 Indoor AC High Voltage SF6 Load Break Switch and LBS-Fuse Combination are designed for use in three-phase AC 50/60Hz RMUs (Ring Main Units) and terminal power stations. These switches are suitable for protecting power systems operating at 10kV, 24kV, and 35kV under on-load conditions. They are capable of interrupting on-load current, closed-loop current, no-load transformer capacity, and cable charging current. When equipped with a fuse combination, they can cut off any current within the range of the rated short-circuit breaking current. These devices find application in RMUs and combined transformers, among others.
Compliance and Environmental Considerations:
- These devices comply with the standards of GB3804-1990, IEC60256-1 (1997), GB16926, IEC60420, and other relevant standards.
Operating Environment:
- Air Temperature: Maximum temperature: +40℃; Minimum temperature: -35℃
- Humidity: Monthly average humidity 95%; Daily average humidity 90%.
- Altitude above sea level: Maximum installation altitude: 5000m
- Ambient air should not be apparently polluted by corrosive or flammable gases or vapors.
- No frequent violent shaking is expected.
Technical Specifications:
- Rated Voltage:
- 12kV (FL(R)N36 Indoor AC High Voltage SF6 Load Break Switch and LBS-Fuse Combination)
- 24kV (FL(R)N36 Indoor AC High Voltage SF6 Load Break Switch and LBS-Fuse Combination)
- Rated Current: 630A
- Rated Power Frequency: 50/60Hz
- Short Circuit Making Capacity:
- 62.5KA Peak (12kV)
- 50KA Peak (24kV)
- Peak Withstand Current:
- 62.5KA Peak (12kV)
- 50KA Peak (24kV)
- Short Time Current:
- 25KA for 1 Sec. (12kV)
- 20KA for 2 Sec. (12kV)
- Max. Breaking Capacity in Cooperation with Fuses:
- 1530A (12kV)
- 920A (24kV)
- Mainly Active Load Breaking Capacity: 630A
- Cable Charging Current: 630A
- Power Frequency Withstand Voltage (50Hz, 1 min):
- To Earth and Between Poles:
- 42kV (12kV)
- 55kV (24kV)
- Across Isolating Distance:
- 45kV (12kV)
- 70kV (24kV)
- To Earth and Between Poles:
- Impulse Withstand Voltage (1.2/50μs):
- To Earth and Between Poles:
- 75kV (12kV)
- 125kV (24kV)
- Across Isolating Distance:
- 85kV (12kV)
- 145kV (24kV)
- To Earth and Between Poles:
- Mechanism Endurance: 1000 cycles
The primary loop of the FL(R)N36 Indoor Load Break Switch and its combination is sealed in an epoxy resin cast insulate unit using APG (Apgar) technology. This insulate unit offers excellent insulating properties and is resistant to dust and moisture. It contains upper and lower insulate covers and is charged with 0.4 bars pressure SF6 gas. The lower cover features a thin, protective layer that will burst in case of malfunction, safely releasing over-pressured gas to protect the equipment.
The SF6 load break switch and its fuse combination provide three working positions: open, close, and earth. These devices are essential components for ensuring the safety and reliability of high-voltage power distribution systems.
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