Flexible Rogowski coil used for detecting direct-current system short-circuit current and method for designing same

Abstract

The invention discloses a flexible Rogowski coil used for detecting the direct-current system short-circuit current and a method for designing the same, the coil comprises a coil and a loop uniformly wound around an annular flexible framework with an opening, an outer layer insulating bush is sleeved outside the coil and the loop, a plug-type interface attached to the coil and the loop is installed on the opening of the annular flexible framework, the coil outgoing line is connected with a sampling resistance module after being educed through the hole of the plug-type interface, the sampling resistance module educes a signal and is connected with a post-integrating circuit. In the Rogowski coil loop winding technique adopted in the invention, the return wire and the coil winding are constituted by one wire. The head end and the tip end of the Rogowski coil are connected by the plug-type interface, which can improve the mechanical life of the Rogowski coil to a great extent, has the advantages of high reliability and convenience for disassembly and installation; the method for designing the Rogowski coil used for detecting the direct-current system short-circuit current can combine the short circuit physical circumstances and the field working condition of the direct-current system.

Description

technical field [0001] The invention belongs to electronic current transformers, and in particular relates to a Rogowski coil for short-circuit current measurement in a DC system and a design method thereof. Background technique [0002] In order to quickly detect the fault when a short-circuit fault occurs in the DC power system, and to connect with the digital intelligent unit more conveniently to realize digital measurement and protection, Rogowski coils based on the principle of electromagnetic induction are widely used. [0003] Compared with other transient current detection methods, the skeleton of the air-core Rogowski coil is a non-ferromagnetic insulating material. Since it does not contain an iron core, there is no magnetic saturation problem in theory, and it is almost not limited by the magnitude of the measured current. Very suitable for the measurement of large currents. [0004] In the measurement of transient large currents, the previous measurement based o...

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Problems solved by technology

[0004] In the measurement of transient large currents, the previous measurement based on Rogowski coils, on the one hand, still needs to be improved in terms of technical performance. The previous hollow Rogowski coils, due to the thin enameled wire used for winding, when the Rogowski coils are subjected to external forces At the same time, the enameled wire is easily broken, causing the failure of Rogowski coil products; on the other hand, there is a lack of a process design method as a guide to better connect with the digital intelligent unit to achieve digital measurement and protection

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