Applications And Parameter Configuration of Separable Connectors

Introduction

Separable connectors, also know as plug-and-play connectors, are critical components in medium-voltage (MV) and high-voltage (HV) electrical systems. They enable safe, flexible, and reliable connections/disconnections between cables, transformers, switchgear, and other power distribution equipment. Their modular design ensures ease of installation, maintenance, and system reconfiguration while maintaining high insulation and mechanical performance.

Key Applications

1. Switchgear and Ring Main Units (RMUs)

  Used to connect/disconnect cables to switchgear or RMUs without de-energizing the entire system.  

  Facilitates isolation for maintenance or fault repair.

2. Transformers

  Provide a safe interface for connecting transformers to MV/HV networks.  

  Enable rapid replacement or testing of transformers.

3. Cable Termination

  Terminate underground or overhead cables in substations, wind farms, or industrial grids.  

  Support transitions between different cable types (e.g., PILC to XLPE).

4. Temporary Power Distribution

  Deployed in mobile substations or emergency power systems for rapid deployment.

5. Renewable Energy Systems

  Connect solar/wind farms to grids with modularity to accommodate variable layouts.

Parameter Configuration

When selecting separable connectors, key parameters must align with system requirements:  

1. Voltage Rating

  - Standard ratings: 15 kV, 25 kV, 35 kV, or 38 kV.  

  - Must exceed the system’s maximum operating voltage.  

2. Current Rating

  - Continuous current capacity: Typically 200 A to 600 A.  

  - Short-circuit withstand: 10–25 kA for 1–3 seconds.  

3. Insulation Material

  - Silicone rubber or EPDM for weather resistance, UV stability, and pollution protection.  

4. Interface Standards

  - IEEE 386, IEC 60502, or ANSI standards for compatibility with bushings, elbows, or dead-break systems.  

5. Mechanical Lifespan

  - Number of mating cycles (e.g., 100–500 cycles) based on contact material (e.g., silver-plated copper).  

6. Environmental Ratings

  - IP67/68 for waterproof/dustproof performance.  

  - Operating temperature: –50°C to +50°C.  

7. Connector Type

  - Elbow Connectors: For 90° cable terminations.  

  - In-Line Connectors: Straight-through connections.  

  - T-Connectors: Branching applications.  

8. Shielding

  - Electrostatically shielded designs to manage electric field stress.  

9. Arc Performance

  - Load-break or fault-interrupting capability (optional for specific models).  

Configuration Examples

1. Urban Distribution Network

  Voltage: 24 kV  

  Current: 400 A  

  Interface: IEEE 386-compliant, 200A load-break elbow  

  Environment: IP68, silicone rubber insulation.  

2. Wind Farm Collector System

  Voltage: 36 kV  

  Current: 630 A  

  Interface: IEC 60502, shielded T-connector  

  Temperature Range: –40°C to +50°C.  

Advantages

  Safety: Live-dead-live indicators and insulated design reduce arc/flash risks.  

  Flexibility: Modularity supports grid expansion or reconfiguration.  

  Durability: Resists harsh environments (moisture, chemicals, temperature swings).  

By tailoring parameters to specific use cases, separable connectors enhance grid reliability, reduce downtime, and streamline operations in modern power systems.