Low-voltage current transformer for metering supervision

Abstract

The invention discloses a low-voltage current transformer for metering supervision, which belongs to the technical field of electric measurement. The transformer comprises an iron core, a secondary winding and a magnetic conductive ring, the secondary winding is wound on the iron core, and the iron core wound with the secondary winding is solidified and placed in the magnetic conductive ring; andthe secondary winding is connected with an automatic verification system of the low-voltage current transformer for metering. The accuracy level of the device is higher than that of a common low-voltage current transformer and can reach 0.02 level or 0.05 level, and the device has good reproducibility, stability and lifting variation and can be used for intermediate check and quality monitoring ofthe automatic verification system of the low-voltage current transformer, so that the measurement process of the automatic verification system is always in a statistical control state.

Description

technical field [0001] The invention relates to the technical field of electric measurement, and more specifically, relates to a low-voltage current transformer for metering supervision. Background technique [0002] Low-voltage current transformers for metering are installed on low-voltage power lines of 0.4kV and below to provide current for metering and other secondary equipment for metering purposes. The commonly used accuracy levels are: 0.2, 0.5S, 0.2S Wait. With the rapid development of my country's power industry, the usage of metering transformers has increased simultaneously. The traditional manual method of verifying electric energy measuring instruments has low work efficiency and high operating costs, and it is difficult to ensure that the verification standards and verification results are highly consistent. At present, the State Grid Corporation of China has built 172 automated verification systems for measuring equipment in 27 provinces across the country t...

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Problems solved by technology

[0004] However, with the rapid increase in the detection volume of each metering center, the complexity of the production line has increased accordingly. The fault point analysis and verification detection conclusions of electric energy measuring instruments are automatically generated by the system, without manual intervention in the whole process. Traditional manual supervision and management methods exist. Hysteresis, when there is a problem in a certain part of the assembly line, when the system responds incorrectly, there may be a large number of problematic products that have passed the assembly line to complete the verification process, but the supervisors cannot accurately judge that these products that may be faulty will affect the safety of the power grid or cause electricity bills Accounting error brings economic loss

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