Adjustable low-voltage current transformer

Abstract

The invention discloses an adjustable low-voltage current transformer. At least more than one center tap is arranged on a secondary coil, and each tap is provided with a terminal block. The current transformer disclosed by the invention realizes multistage adjustment of the transformation ratio of the current transformer under the condition of not changing puncturing number of turns and has the advantages of convenience, fast speed, safety, reliability, cost-saving property and the like, the transformation ratio adjusting efficiency is improved by more than 5 times compared with the prior art, and the current transformer has an anti-theft electric function.

Description

technical field [0001] The invention belongs to the technical field of electrical equipment, in particular to an adjustable low-voltage current transformer. Background technique [0002] In the known technology, the current transformers used in low-voltage customers are basically divided into two categories: one is a fixed ratio, such as the model LMZ-300 / 5; the other is a variable ratio, such as 300 / 5, 150 / 5, etc. These current transformers change the transformation ratio by changing the number of core turns, and their main defects are: [0003] 1. The change is more expensive than the investment. At present, the electricity load of some customers is unstable and fluctuates greatly. Some enterprises adjust production as the market changes. Large-capacity distribution transformers are replaced by small-capacity distribution transformers, and small-capacity distribution transformers are replaced by large-capacity transformers. When changing the transformation ratio, somet...

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Problems solved by technology

However, the transformation ratio is changed by using the method of distribution transformer outlet, and because the core hole of the transformer is often thin, the number of core-through turns cannot be changed at all for large-scale wires, and only one turn can be passed without adjustment.

At the same time, these two methods of modification not only take a lot of time and effort, but also lead to an increase in the cost of the enterprise

[0004] 2. If adjusting the transformation ratio of a distribution transformer, the labor intensity is high, and it is necessary to remove the outgoing line of the distribution transformer, abolish the copper and aluminum wire nose to change the number of turns through the core or replace the transformer. In actual work, adjusting the transformation ratio of a distribution transformer requires 2-3 hours, resulting in a long power outage

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