A Butterfly Bus Ring Used in DC Current Transformer Calibration System

Abstract

The invention discloses a butterfly bus ring for a direct-current transformer calibration system. The butterfly bus ring comprises two notch rings which are identical, form a quadrangle by encircling and are symmetrically arranged on a same plane, wherein notches are formed in the same ends of adjacent edges of the two notch rings and the same ends of the adjacent edges of the two notch rings are input ends while the other ends of the adjacent edges are output ends; the output end of the first notch ring is connected with the input end of the second notch ring and the input end of the first notch ring and the output end of the second notch ring are respectively connected to two terminals of a direct-current power supply output end. When direct current emitted by the direct-current power supply flows in the butterfly bus ring, and a generated asymmetric outer magnetic field slightly influences the precision of a direct-current comparator and a tested direct current transformer installed at the center position.

Description

technical field [0001] The invention relates to a bus ring, in particular to a butterfly bus ring used in a DC current transformer calibration system. Background technique [0002] As a calibration device for various DC current transformers, the DC current calibration system is widely used in many fields, such as cross-regional high-voltage DC transmission systems, non-ferrous metal electrochemical systems, particle accelerators, etc., and its performance is subject to the power sector. highly valued. [0003] The core components in the DC current calibration system include bus bars, standard devices and DC current sources. [0004] The bus bar refers to the connecting conductors of the voltage distribution devices at all levels in the substation, as well as the connecting conductors of electrical equipment such as transformers and the corresponding power distribution devices. When the two ends of the busbar are respectively connected to the current outflow end and the cur...

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Problems solved by technology

Existing bus rings that can reduce the influence of asymmetric external magnetic fields include cross-type and series-parallel structures. Can be used in the laboratory, it is difficult to be used in occasions such as field or industrial scene (see document [1] M.ZhuandK.Xu. -714; [2] Yuan Luming. Electromagnetic Measurement. Beijing: Machinery Industry Press. 1980, 276-293; [3] Shao Haiming. Research on National DC Large Current Measurement Standards. China Metrology, 2014(3): 72-75)

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