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Eccentric Silver Hollow Conductor

The Eccentric Silver Hollow Conductor is a precision‑engineered copper profile designed specifically for the rotor windings of large turbo‑generators in thermal, nuclear, and hydroelectric power plants. The conductor features an asymmetrically positioned internal cooling channel (eccentric bore) that maximizes both electrical conductivity and coolant flow efficiency. Manufactured from silver‑bearing oxygen‑free copper, this product delivers exceptional resistance to thermal softening and mechanical creep under extreme centrifugal and electromagnetic loads.

Applications

Primary Application: Rotor coils for large turbo‑generators (≥ 1,000 MW) in thermal, nuclear, and large hydroelectric power stations.

Secondary Applications: High‑current busbar systems requiring internal liquid cooling; specialized high‑field magnet windings.

This product is particularly critical for power generation equipment manufacturers seeking high‑reliability components that meet IEC 62067 and equivalent international standards.

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Technical Specifications

Parameter	Unit	Specification / Typical Value	Tolerance / Requirement
Material Designation	—	CuAg0.10P (CW013A) / CuAg0.07	Per EN 1652 / ASTM B187
Silver (Ag) Content	%	0.07 – 0.12	±0.01
Electrical Conductivity	% IACS	≥ 98.0	At 20°C
Oxygen Content	ppm	≤ 10	OxygenFree Grade
Tensile Strength (Annealed)	MPa	220 – 260	—
Elongation (A50)	%	≥ 35	—
Softening Temperature	°C	≥ 350	Silverbearing advantage
Outer Width Tolerance	mm	As per drawing (e.g., 10–40 mm)	± 0.03 / ± 0.05
Outer Height Tolerance	mm	As per drawing (e.g., 5–20 mm)	± 0.03 / ± 0.05
Inner Hole Diameter Tolerance	mm	As per drawing (e.g., 3–15 mm)	± 0.05
Wall Thickness Deviation (Eccentricity)	% of nominal wall	≤ 5%	Critical control parameter
Corner Radius (R)	mm	0.5 – 1.5 (customizable)	Per customer drawing
Straightness	mm / 1000 mm	≤ 1.0	—
Twist	° / 1000 mm	≤ 1.0	—
Internal Surface Roughness (Ra)	μm	≤ 0.8	Optimized for coolant flow
External Surface Condition	—	Bright, clean, oxidefree	No scratches, burrs, or defects

FAQs

Q1: Why is Silver (Ag) added to the copper?

Silver raises the softening temperature by ~100–150°C, preventing coil deformation under high thermal and centrifugal stress.

Q2: How is wall thickness deviation (eccentricity) controlled?

Real-time laser measurement (ODAC/UMAC) and closed-loop die adjustment maintain deviation ≤5% of nominal wall.

Q3: What surface condition is supplied?

Bright, clean, and oxide-free with Ra ≤0.8 μm. Ready for mica tape or insulation application.

Q4: Does the eccentric design reduce ampacity?

No. It maximizes copper cross-section while maintaining required coolant flow for improved overall efficiency.

Q5: Can custom dimensions be ordered?

Yes. Custom tooling lead time is approximately 30–45 days from drawing approval.