Why does the transformer charge from the high voltage side? Hazards of transformer charging from the low-voltage side

Transformer is one of the most commonly used power equipment in power transmission systems. It converts high-voltage current into low-voltage current and plays an important role in power transmission. In practical applications, we usually charge the transformer from the high voltage side. Is there any special reason for this? What are the hazards if charging from the low voltage side? This article will introduce these issues in detail.

1. The working principle of the transformer

In order to better understand why charging is from the high voltage side, we need to first understand the working principle of the transformer. The transformer is mainly composed of two coils, called high-voltage coil and low-voltage coil. They are sealed together by an iron core and form the main body of the transformer. When we apply voltage to the high-voltage coil, it will be transmitted to the low-voltage coil through the magnetic lines of the iron core, ultimately producing the effect of voltage conversion.

2. Why charging from the high voltage side

Usually in traditional power systems, we charge the transformer from the high voltage side. Mainly because in the substation, the high-voltage current passing through the transformer is transformed into low-voltage current, and then the power is supplied to the low-voltage network. Charging on the high-voltage side can make the low-voltage coil of the transformer safer than the high-voltage coil. Because the conductors of the high-voltage coil in the transformer use wire bundles or large-section cables, they need to be reasonably arranged and explosion-proof when used. Using wire bundles and cables at the same time can also reduce wire number confusion and market procurement costs. In addition, the wires drawn from the low-voltage coil of the transformer are usually relatively thin, and the wire numbers may be complicated and confusing. If we charge from the low-voltage side, the wires on the low-voltage side will be exposed to high voltage, and accidents such as short circuit or leakage will occur, causing huge losses.

3. The hazards of charging from the low-voltage side

If we have to charge from the low-voltage side, we usually encounter the following problems:

1 . Safety issues

If charging from the low-voltage side, the low-voltage coil will be fully charged first. When the current flows to the high-voltage side, it may cause unexpected electric shock or explosion. The whole process is very dangerous.

2. System stability issues

When using distribution transformers, charging from the low voltage side will lead to insufficient stability because the power system load changes over time. This will affect the power supply capacity of the system and thus affect the normal power consumption of users.

3. The problem of reduced efficiency

If charging from the low-voltage side, due to the small current, the current density of the transformer will become lower, which will affect the working efficiency of the transformer, causing voltage drop, The resistance rises, the power loss increases, and the power supply cost increases.

4. Summary

Transformers play a very important role in the power system, but in practical applications, we need to pay attention to the charging method of the transformer. Charging the transformer from the high voltage side is a safe and reliable way, which can effectively ensure the safety and efficiency of the transformer. Charging from the low-voltage side will bring about very obvious safety issues, and will also affect the stability of the transformer and the efficiency of power utilization. In actual work, please be sure to pay attention to the charging method of the transformer to ensure the safety, stability and efficient use of energy.