Customization Process for Single-Core Relay Protection Wall-Mounted Wiring Boxes

The customization process involves defining system requirements, selecting core components, designing the enclosure, wiring, testing, and ensuring compliance with relevant standards.

1. Preliminary Requirements and Core Parameters

The first step is to define the electrical and environmental requirements of the relay protection system. Key parameters include system voltage (e.g., 230/400V AC single-phase or three-phase), total capacity, number of circuits, branch current, and short-circuit breaking capacity (Icu/Ics). Environmental factors such as indoor/outdoor installation, IP rating (IP30 for indoor, IP54/IP66 for outdoor), and material selection (cold-rolled steel, 304/316 stainless steel) are also critical. Functional requirements like metering, surge protection, dual-power ATS switching, and remote monitoring should be specified at this stage .

2. Core Component Selection

Select reliable protective devices and components that meet mandatory standards (IEC 61439, GB 7251.1). Components typically include MCCBs (NSX/XT), MCBs (EA9/A9), ATS units (WATSN), and surge protection devices. All components should have CCC and CE certifications, and the manufacturer must hold low-voltage assembly qualifications . The relay selection should consider operating characteristics such as definite time, inverse time, differential, over-fluxing, and logic-based protection schemes .

3. Enclosure Design and Configuration

Wall-mounted enclosures are commonly sized 400×500×200 mm or 600×800×250 mm, with coatings like RAL7035 for indoor use. Outdoor enclosures may include sealing gaskets, rain hoods, and corrosion-resistant materials (316 stainless steel for coastal environments). The design must accommodate wiring, terminal strips, and mounting of relays and auxiliary devices .

4. Wiring and Assembly

Wiring should follow standard lead and device numbering, color codes, and multicore cable practices. Single-core wiring is typically used for precise relay connections, ensuring clear separation of control, trip, and indication circuits. Proper ferrule labeling, terminal connections, and routing are essential for reliability and maintenance . All wiring should be executed according to IEC/GB standards and manufacturer guidelines.

5. Testing and Commissioning

After assembly, the panel undergoes functional testing to verify relay operation, trip accuracy, and alarm circuits. Tests include simulation of fault conditions, verification of close and trip circuits, and confirmation of correct interlocks. On-site commissioning ensures proper integration with the system, and as-built documentation (drawings, certificates, test reports) is provided .

6. Delivery and Integration

Customized panels are typically factory-built, wired, and tested to minimize on-site labor. Only incoming and outgoing connections are required after installation. Panels are designed for durability, environmental protection, and seamless integration into control buildings or substations .

Summary

The customization process for single-core relay protection wall-mounted wiring boxes involves a systematic approach: defining requirements, selecting compliant components, designing the enclosure, precise wiring, rigorous testing, and ensuring compliance with international standards. This ensures reliable, safe, and efficient operation of the protective relay system.