MV Intelligent Load Shedding Recloser China Factory
- Product Name:
- MV Intelligent Load Shedding Recloser
- Model Number:
- SLC
- Brand:
- SMICO
- Voltage:
- 3.3kV–38kV
Description
MV Intelligent Load Shedding Recloser
SLC:Intelligent MV load switching/shedding recloser. SFS body supports basic control & sensing; SWK module adds virtual 3-phase interlock, advanced protection, SCADA. 3.3–38kV, all-vacuum, SF6-free.
Key attributes
| Brand | SMICO |
| Series | SLC |
| Rated Voltage | 3.3kV–38kV |
| Rated Load Current | Up to 320A |
| Interruption Method | Pure vacuum interruption, solid insulated pole |
| Rated Frequency | 50/60Hz |
Description
Pure Vacuum Interruption | SFS+SWK Architecture | SMICO
The SLC Intelligent Load Switching and Shedding Recloser is an outdoor medium-voltage distribution assembly.
It uses the SFS pure vacuum switch body as the core for execution, sensing, and basic control, and the RWK intelligent control box as an upgrade module for virtual three-phase linkage, advanced protection, and SCADA communication.
It is dedicated to overhead line sectionalizing, loop coupling, capacitor bank switching, DG integration, and peak-valley load shedding.
What is the relationship between RLC / RFS / RWK?
- SLC: The complete assembly model, representing a deliverable and operational intelligent load switching and shedding switchgear.
- SFS Switch Body: The physical core of the assembly, responsible for current carrying, pure vacuum interruption, electrical sampling, basic time strategies, mode management, and local interlocking.
- RWK Intelligent Control Box: An optional upgrade module that does not replace the SFS. It overlays virtual three-phase linkage, advanced protection algorithms, and high-level communication capabilities on top of the RFS.
Quick Mnemonic: SLC = Complete Assembly; SFS = The "Brain + Hands" of the body; SWK = The advanced "Cloud Brain".
Product Positioning & Core Keyword Coverage
The SLC targets load intelligent switching and shedding scenarios in medium-voltage distribution networks (3.3kV–38kV). It is a pole-mounted switchgear that is SF6-free, features pure vacuum interruption, supports local autonomous operation, and allows for remote upgradeable control.
Compared to traditional load switches, the advantages of SLC are:
- The SFS body has built-in basic control, allowing it to run local strategies even during power or communication outages.
- With the SWK upgrade, it supports virtual three-phase linkage for coordinated switching across multiple devices.
- The entire series uses pure vacuum interruption—no greenhouse gases, no gas pressure maintenance.
- Basic and advanced functions are decoupled, allowing customers to select configurations based on scenarios without being forced into unnecessary costs.
SFS Switch Body: Trinitized Execution, Sensing, and Basic Control
Structure & Interruption
The SFS adopts an outdoor pole-mounted structure, using a pure vacuum interrupter as the sole arc-extinguishing medium, encapsulated in solid insulating poles.
It is free from SF6, oil, and gas pressure monitoring. Vacuum interruption offers fast arc extinction, strong dielectric recovery, long electrical life, and requires minimal maintenance. It is highly resistant to high humidity, salt spray, pollution, and extreme temperatures.
Key Parameters
| Item | Specification |
|---|---|
| Rated Voltage | 3.3kV – 38kV (covers typical MV ratings: 12/15.6/24/33kV) |
| Rated Load Current | Up to 320A |
| Interruption Method | Pure vacuum interruption, solid insulated pole |
| Breaking Capacity | Load current, overload current, unloaded lines, unloaded transformers, and capacitor bank currents |
| Short-circuit Coordination | Permanent short circuits are isolated by upstream circuit breakers or fuses |
| Operating Mechanism | Permanent magnetic actuator, three-phase synchronous drive, high mechanical endurance |
| Insulation Level | Power frequency and lightning impulse withstand voltages configured per voltage class, meeting high outdoor pollution levels |
Basic Control Functions Integrated into SFS
| Item | Specification |
|---|---|
| Time Strategies | Four independent daily cycle windows (C01–C04) with 1-minute resolution, supporting cross-midnight scheduling. |
| Mode Management | Dual-dimensional permission separation for AUTO/MANUAL × LOCAL/REMOTE. |
| Basic Protection | Phase overcurrent, zero-sequence overcurrent, undervoltage, overvoltage, no-current, inrush current identification, and cold load pickup suppression. |
| Basic Interlocking | Position feedback verification, operating power detection, capacitor discharge blocking, and reverse operation blocking. |
| Local HMI | Front panel LCD and navigation keys for independent configuration and monitoring. |
| Event Logging | Categorized archiving of operations, alarms, and mode changes, marked distinctly as Success, Denied, Failed, or Unknown. |
RWK Intelligent Control Box: An Upgrade Module, Not a Replacement
The SWK is stacked on top of the RFS to solve problems that a "single switch cannot handle alone":
Virtual Three-Phase Linkage Control
Achieves phase synchronization, load balancing, and coordinated switching among multiple SLC units. Ideal for multi-node capacitor banks, distributed generation clusters, and flexible feeder dispatch.
Advanced Protection Algorithms
Overlays on top of SFS basic protection:
- Adaptive overcurrent identification
- High-impedance ground fault precision criteria
- Directional zero-sequence protection
- Complex fault classification and adaptive reclosing strategies
Advanced Communication & SCADA Integration
- Communication: 4G/5G, Ethernet, Fiber Optic, RS485/RS232
- Protocols: Modbus, DNP3, IEC 60870-5-104/101
- Systems: SCADA, DMS, Feeder Automation (FA)
- 3-RTU Functions: Telemetry, Teleindication, Telecommand (commands undergo final interlocking verification by SFS)
