Complete transposition multi-strand circular stranded wire and wound non-inductive resistor

Abstract

The invention relates to the technical field of resistor manufacturing, and particularly relates to a complete transposition multi-strand circular stranded wire. The complete transposition multi-strand circular stranded wire comprises an encapsulating insulating layer, a forward stranding wire, a backward stranding wire, a single-strand stranded wire insulating layer and a forward and backward stranding wire insulating layer, wherein the encapsulating insulating layer wraps outside the forward stranding wire and the backward stranding wire; the forward stranding wire and the backward strandingwire are respectively composed of a six-strand stranded wire; each strand is stranded by no less than three single circular wires; the single-strand stranded wire insulating layer adopts two polyester films with a thickness of 25[mu]m, and the two polyester films are respectively wound on the forward stranding wire and the backward stranding wire in a forward-backward crosswise manner; the forward and backward stranded wire insulating layer separates the forward stranding wire and the backward stranding wire and is formed by winding a layer of DMD with a thickness of 0.4mm in an accompanyingmanner. Aluminum wires / copper wires are adopted to replace nickel-chromium, the temperature rise under the continuous current is not less than 20K, the temperature control is not more than 60 DEG C, and the short-term temperature is not higher than 180 DEG C under impact short-circuit current, thereby not causing secondary failure, and being safe and reliable.

Description

technical field [0001] The invention relates to the technical field of manufacturing resistors, in particular to a fully transposed multi-strand round twisted wire and a winding non-inductive resistor. Background technique [0002] In recent years, with the gradual increase in the number of HVDC converter stations and urban rail transit system construction and operation, the AC substation near the ground electrode and the rail line caused by the DC power supply system of urban rail transit has been caused by the single pole operation of DC transmission. A fairly common DC bias problem occurs with transformers. [0003] At present, the technical solutions adopted by the DC bias suppression device mainly include the resistance current limiting type and the capacitor DC blocking type. Resistor current-limiting type is widely used because of its simple and reliable structure and low cost. High-voltage resistors mainly have rod structure and chip structure. For high-power or hi...

AI Technical Summary

Problems solved by technology

Since the DC blocking device is very close to the main transformer, it can trigger the smoke alarm in the station and even endanger the safe operation of the main transformer;

[0005] 2) Under the impact of large current, even if there is a small amount of inductance, its mechanical stability is extremely poor;

[0006] 3) Each unit resistance is composed of dozens of resistance pieces connected in series and parallel by welding. There are many welding positions, and the material has high hardness but poor toughness, which is easy to cause the pieces to be welded without aging and fracture;

Due to the large difference in the spatial positions of the front and back layers in this way, a very considerable inductance content (up to 1mH or more) appears, and the winding commutation is very difficult and the production efficiency is low.

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