Design of height maximum boundary dimension of transposed conductor in transposed conductor standard and measurement test method of height maximum boundary dimension of transposed conductor

Abstract

The invention discloses a design and measurement test method for the maximum height boundary dimension of a transposed conductor in a transposed conductor standard, and the maximum height boundary dimension H3max of the transposed conductor is equal to the quotient obtained by dividing the product of the sum of the number n of flat wires forming the transposed conductor and 2 and the maximum boundary dimension Amax of the narrow edges of the flat wires by 2, the sum of the maximum thickness delta max of the two sides of the outer insulating layer (if a binding rope and a binding net exist) is added, the sum of the products of the theoretical minimum transposition gap lambda and the rigidity coefficient k0 is added, and the calculation formula is H3max = (n + 2) * Amax / 2 + delta max + k0 * lambda; the measuring method comprises the steps that a pair of outer measuring claws of the vernier caliper with the measuring range of 300 mm and the division value of 0.02 mm are used, the caliper body is close to the transposed conductor as much as possible, and the highest point of the top face of the outer contour of the transposed conductor and the lowest point of the bottom face of the outer contour of the transposed conductor are clamped in the length direction of the transposed conductor for measurement. The method has the beneficial effects that the defects existing in related national and departmental standards which are followed for recent 30 years are corrected, so that the national standard has wider guiding significance, and the method has constructability for improving the authority of the national standard.

Description

Technical Field

[0001] The invention relates to the design of the external dimensions in the wire and cable standards and the measurement test method thereof, in particular to the design of the maximum external dimensions of the height of a transposed conductor in the transposed conductor standards and the measurement test method thereof. Background Art

[0002] Transposed conductor is a kind of electromagnetic wire in the field of wires and cables. Since its introduction in China in the 1980s, it has been increasingly widely used in electrical products due to its excellent comprehensive performance.

[0003] The actual appearance and organizational structure of the transposed conductor product are as follows Figure 1 and Figure 2 As shown, the external dimensions of the transposed conductor are very important indicators of the transposed conductor, which are related to the production of the transposed conductor and the design, production and use of downstream products. As a standard for regulating products, it should objectively, truly and comprehensively reflect the role of the product in the industrial chain, limit the production of unqualified products, and provide protection for the downstream of the industrial chain. In particular, national standards should be more scientific and authoritative.

[0004] However, according to the provisions of the National Standard GB / T 33597-2017 Transposed Conductor (hereinafter referred to as GB / T 33597) on the maximum dimensions of the height of the transposed conductor (such as Figure 3 However, it does not fully and truly reflect the objective attributes of the products in reality, which reduces the authority of the national standards.

[0005] In addition, the relevant deficiencies in "GB / T 33597" are inherited from the original "Machinery Industry Standard of the People's Republic of China JB / T6758.1-2007 Transposed Conductors Part 1: General Provisions".

[0006] In summary, GB / T 33597 is seriously divorced from actual production, lacks guidance for the design, production and use of transposed conductors, and reduces the authority of the national standard. Summary of the invention

[0007] The problem to be solved by the present invention is: taking a transposed conductor with a core composed of 9 flat wires as an example, a design of the maximum external dimensions of the transposed conductor height and a measurement test method thereof are given, and its mathematical model is as follows Figure 4 As shown, the erroneous provisions of GB / T 33597 are corrected.

[0008] 1. The technical solution adopted by the present invention is: the design of the maximum external dimensions of the height of the transposed conductor in the transposed conductor standard and the measurement test method thereof. In the transposed conductor manufacturing standard, when designing the maximum external dimensions of the height of the transposed conductor, it is characterized in that: the maximum external dimensions H of the height of the transposed conductor 3maxIt is equal to the sum of the number of flat wires (number of roots n) that make up the transposed conductor plus two and the maximum outer dimension A of the narrow side of the flat wire. max The product of divided by two, plus the sum of the maximum bilateral thickness of the outer insulation layer (including the rope and net if any) Δmax, plus the sum of twice the product of the theoretical minimum transposition gap λ and the rigidity coefficient k0, the calculation formula is: H 3max =(n+2)*A max / 2 +Δ max +2k0*λ; the maximum dimension H of the transposed conductor height measured 3max The method is characterized in that: a pair of external measuring jaws of a vernier caliper with a measuring range of 300 mm and a graduation value of 0.02 mm are used, the ruler body is as close to the transposed conductor as possible, and the highest point of the top surface and the lowest point of the bottom surface of the outer contour of the transposed conductor are clamped along the length direction of the transposed conductor for measurement.

[0009] The beneficial effects of the present invention are as follows: the defects existing in the relevant national and ministerial standards that have been used for nearly 30 years are corrected, so that the national standards have a broader guiding significance in actual production and the use process of the upstream and downstream of the industrial chain, which is constructive for improving the authority of the national standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is the front view of a real transposed conductor core product consisting of 19 enameled rectangular wires;

[0011] Figure 2 This is a top view of a real transposed conductor core product consisting of 19 enameled flat wires;

[0012] Figure 3 It is the calculation formula for the maximum external dimensions of the transposed conductor height given in GB / T 33597;

[0013] Figure 4 The present invention takes the transposed conductor with 9 flat wires as an example to give a mathematical model schematic diagram and the maximum external dimension H of the transposed conductor height. 3max The location is shown. DETAILED DESCRIPTION

[0014] The transposed wire core is made by twisting an odd number of 9 insulated flat wires (hereinafter referred to as flat wires). The "twisted" flat wires are arranged in two rows, one row with 5 wires and the other row with 4 wires. When the transposition begins, ① the flat wire harness runs to the same horizontal position on the bottom of the two rows, with 5 wires in the front row and 4 wires in the back row. The front row has one more wire than the back row. This flat wire begins to transpose under the combined lateral (horizontal) and upward traction provided by the capstan. Under the constraint of the positioning device, it transposes from the front row to the back row. At this time, the front row becomes 4 wires and the back row becomes 5 wires, and the upper transposition is completed; thereafter, under the traction of the longitudinal (gravity direction) force of the capstan, the 1#~4# flat wires in the front row harness run upward, and the 5#~9# flat wires in the back row harness run downward, until the flat wire harness runs to 0.50 transposition pitches, and the lower transposition process is carried out. ②At this time, the flat wires in the two rows of wire harnesses after transposition are both inclined with the horizontal plane, but the angles are completely opposite. The front row is high on the left and low on the right, and the rear row is low on the left and high on the right. However, the top surfaces of the two rows of wire harnesses must be at the same horizontal position. At this time, there are 4 wires in the front row and 5 wires in the rear row. The 9# flat wires in the rear row that protrude downwards from the front row begin to transpose under the lateral (opposite to the above lateral force) traction provided by the winch. Under the constraint of the positioning device, they are transposed from the rear row to the front row. At this time, the front row is restored to 5 wires, numbered 9#, 1#, 2#, 3#, and 4# from bottom to top, and the rear row is restored to 4 wires, numbered 5# to 8# from top to bottom. The lower transposition process is completed; the wire harness after the lower transposition is completed continues to run until the complete transposition pitch is reached; at this time, the flat wires in the two rows of wire harnesses after transposition are still inclined with the horizontal plane, but the angles are completely opposite. The front row is high on the left and low on the right, and the rear row is low on the left and high on the right. The production process of the transposed wire core is to repeat the above ①② process continuously. Therefore, the top and bottom contours of the transposed conductor are a wavy line when viewed from the vertical plane. The top crest and the bottom trough are in the same vertical section, and the top trough and the bottom crest are in the same vertical section. The two vertical sections are 0.50 transposition pitches apart, that is, the top crest and the bottom trough are horizontally 0.50 transposition pitches apart, and the height H3 is:

[0015]

[0016] Where: n: the number of flat wires that make up the transposed conductor;

[0017] Amax: Maximum size of the narrow side of the flat wire;

[0018] Δmax: Maximum size of the outer wrapping layer (including rope and net) on both sides;

[0019] λ: theoretical minimum transposition gap;

[0020] K0: Rigidity coefficient.

[0021] The above formula does not include the gap between the flat wires during the manufacturing process of the transposed conductor. This gap has a negative effect on the downstream products of the transposed conductor, so the smaller the better, (n+2)*A max / 2 is used as the nominal size and controlled by ki tolerance. The tolerance grade i is determined by negotiation between the supply and demand parties.

[0022] H 3max Use the outer measuring jaws of a vernier caliper with a measuring accuracy of not less than 0.02mm and a measuring range of 0 to 300mm. Use a pair of outer measuring jaws to clamp the highest point of the top surface and the lowest point of the bottom surface of the outer contour of the transposed conductor along the length direction of the transposed conductor (where the angle between the ruler body and the transposed conductor is the smallest). Measure at least 3 locations and take the average value as the measurement result.

[0023] It is worth pointing out that the protection scope of the present invention is not limited to the above-mentioned specific implementations. For example, although the present invention only describes the upper transposition of a transposed core composed of 9 flat wires, it is also applicable to the upper and lower transpositions of a transposed core composed of N (N is a natural number) flat wires. According to the basic technical concept of the present invention, implementations that can be associated with by ordinary technicians in this field without creative work all belong to the protection scope of the present invention, and the protection scope of the present invention shall be based on the scope of its claims.

Claims

1. Design of the maximum external dimensions of the height of the transposed conductor in the transposed conductor standard and its measurement test method. In the transposed conductor manufacturing standard, when designing the maximum external dimensions of the height of the transposed conductor, it is characterized by: Maximum dimension of transposed conductor height H 3max It is equal to the sum of the number of flat wires (number of roots n) that make up the transposed conductor plus two and the maximum outer dimension A of the narrow side of the flat wire. max The product of the two divided by the quotient, plus the maximum thickness of the outer insulation layer on both sides (including the rope and net if there is one) Δ max The sum of the theoretical minimum transposition clearance λ and the product of the rigidity coefficient k0 is calculated as follows: 3max =(n+2)*A max / 2 +Δ max +k0*λ; the maximum dimension H of the transposed conductor height measured 3max The method is characterized in that: a pair of external measuring jaws of a vernier caliper with a measuring range of 300 mm and a graduation value of 0.02 mm are used, the ruler body is as close to the transposed conductor as possible, and the highest point of the top surface and the lowest point of the bottom surface of the outer contour of the transposed conductor are clamped along the length direction of the transposed conductor for measurement.

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