Copper Braid for Transformer & Grounding Applications
High-conductivity copper braided connectors for power transformers, earthing systems, and electrical grounding — custom manufactured to your specifications.
Transformer Copper Flexible Connectors
Power transformers require reliable flexible connections between windings, bushings, and tap changers — connections that must endure decades of thermal cycling, electromagnetic forces, and occasional short-circuit stresses without failure. Yulian manufactures copper braided transformer connectors trusted by transformer OEMs and repair shops worldwide.
Transformer Applications
- Winding-to-bushing connections — flexible braided links between transformer windings and HV/LV bushings
- Tap changer flexible leads — high-flex-life copper braids for on-load and off-load tap changers
- Neutral grounding connectors — braided copper earthing leads for transformer neutral points
- Inter-winding jumpers — custom-shaped flexible jumpers for series/parallel winding configurations
Transformer Connector Features
- OFC (C10200) copper for maximum conductivity ≥ 101% IACS
- Tin or silver plating for oxidation resistance
- Flat-pressed terminal ends with bolt holes per your drawing
- Insulation options: PVC sleeve, silicone-coated fiberglass, Nomex
- Custom bending: 45°, 90°, Z-bend, U-bend profiles
Electrical Grounding & Earthing Solutions
Proper electrical grounding is the foundation of any safe electrical installation. Yulian's copper braided earthing connectors provide low-impedance ground paths for equipment protection, lightning protection systems, and electrical safety grounding in industrial, commercial, and utility applications.
Grounding Applications
- Switchgear & panel board grounding — flexible braided earth straps for hinged doors and removable panels
- Motor & generator frame grounding — vibration-resistant braided earth leads for rotating machinery
- Equipment rack grounding — data center and telecom rack earthing jumpers
- Lightning protection down conductors — high-surge-capacity copper braids for LPS installations
- Substation ground grid connections — heavy-duty braided connectors for above-ground bonding
Grounding Products
- Braided earth straps — flat braid with pre-punched terminal ends, 6 mm²–300 mm²
- Flexible earthing jumpers — round or flat braid with tubular or flat terminals
- Custom ground braids — any length, cross-section, terminal type, and hole pattern
- Tinned copper earth tape — corrosion-resistant for outdoor and underground use
Technical Specifications
| Parameter | Transformer Connectors | Grounding Braids |
|---|---|---|
| Copper grade | C10200 (OFC) / C11000 (ETP) | C11000 (ETP) |
| Cross-section range | 10 mm² – 800 mm² | 6 mm² – 300 mm² |
| Current rating | 100A – 4000A | 50A – 1500A (fault: up to 50kA/1s) |
| Terminal type | Flat-pressed, tubular, custom | Pre-punched flat, ring, fork |
| Surface treatment | Tin / Silver / Bare | Tin (standard) / Bare |
| Standards | IEC 60076 / IEEE C57 | IEC 62305 / IEEE 80 / UL 467 |
| Flex life | > 100,000 cycles | > 50,000 cycles |
Why Copper Braid for Transformer & Grounding?
- Highest conductivity: Copper braid provides ≥ 100% IACS conductivity, essential for minimizing heat generation in continuous-duty transformer connections.
- Skin effect mitigation: At 50/60 Hz, the individual strands in a copper braid significantly reduce skin effect losses compared to solid copper bars of equivalent cross-section.
- Flexibility under stress: Braided construction absorbs thermal expansion (copper expands at 16.5 × 10⁻⁶/°C) without transferring mechanical stress to brittle transformer bushings or insulators.
- Short-circuit withstand: Properly sized copper braids withstand rated short-circuit currents (up to 50 kA for 1 second) without fusing or mechanical failure.
- Corrosion resistance: Tin-plated braids maintain low contact resistance at bolted joints for 25+ years in indoor installations.
Transformer & Grounding Copper Connections — Made to Spec
Send your transformer rating, terminal dimensions, and environment — we'll engineer a solution and quote within 24 hours.