IEC 60317-0-4:2020 specifies general manufacturing and performance requirements for glass-fiber-wound enameled rectangular copper wire. This kind of wire is a key component in a variety of electrical applications, such as transformers, motors, and reactors. IEC 60317-0-4:2020 helps ensure that the glass-fiber-wound enameled rectangular copper wires meet stringent international standards.
Key Specifications for Glass-fiber-wound Enameled Rectangular Copper Wire
1. Thermal Properties
—Thermal Class: The standard specifies different thermal classes based on the maximum continuous operating temperature of the wire. For example, Class 155 (Class F) and Class 180 (Class H) indicate that the wire can operate at temperatures of 155°C and 180°C, respectively. This classification is critical for applications involving high temperatures to ensure the longevity and reliability of the wire.
—Thermal durability: The wire is exposed to high temperatures for extended periods of time to determine its thermal durability. For example, a Class 155 wire should maintain its performance after 20,000 hours of continuous exposure at 155°C with no significant degradation.
2. Electrical Properties
—Dielectric strength: This property measures the ability of the wire insulation to withstand electrical stress without breakdown. Standards typically require a dielectric strength of at least 4000 V/mm. High dielectric strength is critical to preventing electrical faults and ensuring safety in high-voltage applications.
—Insulation resistance: High insulation resistance is critical to preventing leakage currents that could cause short circuits or other failures. Standards specify a minimum value for insulation resistance, usually related to the cross-sectional area and length of the wire, to ensure reliable performance.
3. Mechanical Properties
—Tensile strength: The wire must have sufficient tensile strength to withstand the mechanical stresses during manufacturing, installation, and operation. For rectangular copper wire, a typical tensile strength requirement might be around 200 N/mm².
—Elongation: Adequate elongation is critical for flexibility and durability. Standards typically require an elongation of at least 15%, indicating that the wire will not break when stretched, which is important for handling and installation.
—Adhesion and flexibility: The insulation must adhere well to the copper conductor and remain flexible enough to not crack when bent and wound. This ensures that the wire maintains its integrity during installation and use.
4. Dimensions and Tolerances
—Rectangular cross-section dimensions: Standards specify precise dimensions and tolerances for wire width and thickness. For example, a wire with a width of 4.00 mm might have a tolerance of ±0.05 mm, while a wire with a thickness of 2.00 mm might have a tolerance of ±0.03 mm. These precise measurements are critical to ensure compatibility and performance in electrical systems.
—Conductor edge radius: The edges of rectangular wires must be smooth and rounded to prevent damage to the insulation. A typical edge radius might be around 0.20 mm, ensuring that the wire has no sharp edges that could damage the insulation.
5. Surface Quality and Coating
—Surface smoothness: The surface of the wire must be smooth and free of defects such as scratches that could compromise the performance of the insulation. A smooth surface also facilitates better winding and lamination of electrical components.
—Coating: For enameled wire, the coating must be uniform and free of pinholes. The thickness of the coating and its adhesion to the copper wire are critical to maintaining the integrity of the insulation and ensuring long-term performance.
Main Test Data about Glass-fiber-wound Enameled Rectangular Copper Wire
- Thermal Durability Test
| Temperature | 150°C |
| Test duration | 20,000 hours |
| Insulation breakdown | No significant degradation after the test duration |
2. Dielectric Strength Test
| Number of samples | 10 samples |
| Applied voltage | 5000 V |
| Number of breakdowns | 0, showing excellent dielectric strength |
3. Tensile Strength and Elongation Tests
| Tensile Strength | 220 N/mm² |
| Elongation | 32% |
| Number of Test Samples | 50 |
| Qualified Rate | 100% |
