EN 50182 Conductors for Overhead Lines - Round Strand, Concentric Braided Conductors

The European standard “EN 50182 Conductors for overhead lines - Concentric braided conductors with round wire” describes the electrical and mechanical properties of concentric open overhead electrical conductors with round wire, twisted in alternating directions, greased or ungreased, according to the EN 50326 standard. These conductors can be made from one or a combination of the following:

Hard-drawn aluminum, designated as AL1 according to the EN 60889 standard.
Aluminum alloy designated as AL2 to AL7 according to the EN 50183 standard.
Zinc-coated steel wire, designated as ST1A, ST2B, ST3D, ST4A, ST5E, and ST6C according to the EN 50189 standard.
Aluminum-coated steel wire, designated as 20SA (classes A and B), 27SA, 30SA, and 40SA according to the EN 61232 standard.

Conductors made solely from zinc-coated steel wires are excluded from this standard.

For the purposes of this standard, in addition to the definitions given in IEC 60050-466, the following definitions apply:

Aluminum: Used as a general term referring to both drawn aluminum and aluminum alloys.
Twisting direction: Defined as right-hand or left-hand. In right-hand twisting, when the conductor is held vertically, the wires align with the middle of the letter Z. In left-hand twisting, when the conductor is held vertically, the wires align with the middle of the letter S.
Layer ratio: The ratio of the layer length to the outer diameter of the respective wire layer in a multi-strand conductor.
Lot: A group of conductors produced by the same manufacturer under similar production conditions. A lot may consist of a portion or all of the purchased quantity. The composition of a lot can be agreed upon between the buyer and the manufacturer.
Nominal: The target value of a measurable characteristic of a conductor or conductive component, where tolerances are applied.
Wire: A drawn metal filament with a constant circular cross-section.
Nominal tensile strength: An estimate of the conductor's breaking load calculated using the specified tensile properties of the component wires.

A system of identification is used to describe multi-stranded conductors made of steel or non-steel aluminum. Conductors are identified as follows:

A code number that appropriately gives the nominal area of aluminum or steel, rounded to the nearest whole number.
A description that defines the type of wire that makes up the conductor. For composite conductors, the first description refers to the envelope, and the second to the core.

In the world of electrical engineering, reliable power transmission is of paramount importance. Overhead lines that carry electricity over long distances rely on conductors that must withstand environmental stresses, mechanical loads, and electrical demands. The EN 50182 standard is a key European standard defining the characteristics of concentric twisted-strand conductors used in these critical applications. This standard ensures uniformity, safety, and performance in the design and manufacture of these essential components.

The EN 50182 standard, published by the European Committee for Electrotechnical Standardization (CENELEC), replaces older national standards by harmonizing requirements across Europe. This standard continues to evolve with advancements in materials and test methods.

The EN 50182 standard applies specifically to multi-strand conductors made of round wires arranged in concentric layers. These form the backbone of overhead power lines, including bare conductors used in transmission and distribution networks. The standard covers:

Material properties: Conductors are typically made from aluminum, aluminum alloys, or combinations thereof with steel for reinforcement.
Construction requirements: Wires must be bent with precise twist lengths, twist directions, and tolerances to ensure uniformity and tightness.
Performance tests: Mechanical strength, electrical conductivity, and environmental resistance are rigorously defined.

This standard specifically excludes standard insulated conductors or those intended for indoor use, and instead focuses on outdoor applications where resistance to wind, ice, and thermal expansion is critical. This standard is compatible with broader IEC standards such as IEC 61089 for global interoperability.

The EN 50182 standard classifies conductors according to their composition, and each is adapted to specific power requirements:

All-aluminum conductors: These conductors are lightweight and cost-effective, making them ideal for shorter distances or low-voltage lines. These conductors are classified as follows:
AL1: Made from aluminum with a purity of at least 99,5%.
AL2: Higher purity aluminum (at least 99,7 percent), offers better conductivity.

Wires are typically no larger than 4 mm in diameter and are twisted in concentric layers. This standard specifies parameters such as cross-sectional area, kinking class, and maximum DC resistance at 20 degrees. For example, a common all-aluminum conductor size might have an area of 50 mm² with 7 wires and achieve a breaking strength of approximately 8,4 kN.

All-aluminum alloy conductors: For increased strength without added weight, these conductors utilize aluminum-magnesium-silicon alloys. These conductors deliver superior performance in high-temperature environments and over long spans, and exhibit better resistance to sagging compared to pure aluminum. The EN 50182 standard mandates the following:
Wire grades such as 1350-H19 or 6201-T81.
Manufacturing tolerances for mechanical properties and surface finish.
Wire arrangement to ensure even bending and minimal breakage during installation.

All-aluminum alloy conductors are popular in modern networks due to their corrosion resistance and up to 20 percent higher tensile strength compared to all-aluminum conductors.

Steel-reinforced aluminum conductor: These conductors combine aluminum wires around a galvanized steel core, balancing conductivity with mechanical strength. This hybrid is the primary conductor for high-voltage transmission lines hundreds of kilometers long. The essential requirements of the EN 50182 standard are as follows:
Steel wires with 1% elongation stress for tensile calculations.
Aluminum conforming to GB/T 1179-2008 standard (equivalent to IEC 61089 standard) with a resistivity not exceeding 28.264 nΩ·m.
Nominal tensile strength is the sum of aluminum and steel additives.

The EN 50182 standard applies specifically to concentric twisted-wire conductors, which consist of numerous aluminum or aluminum alloy wires arranged in layers around a central wire. These conductors are designed for use in open overhead lines, typically at voltages ranging from low to very high (up to 500 kV).

For many years, our organization, with its competent and experienced staff, has been understanding the needs of its customers, providing the advanced testing services they require, and assisting in the establishment, implementation, and improvement of management systems. Within this framework, we also provide testing services to businesses in accordance with the "EN 50182 Conductors for overhead lines - Concentric braided conductors with round wire" standard.