Basic protection knowledge of transformers

Major internal faults in transformers include inter-turn short circuits, turn-to-turn short circuits in windings, and ground faults in the neutral grounding system windings. These faults are very dangerous because the high temperature electric arc produced by the short-circuit current will not only burn the winding insulation and iron core, but also decompose the insulating materials and transformer oil, producing a large amount of gas. This may cause local deformation or rupture of the transformer oil tank, or even an explosion. Therefore, when an internal fault occurs in a transformer, it must be quickly removed from service. This must be remembered.

05-15

2024

Methods for reducing transformer losses

Power transformers are one of the most important pieces of equipment in the power system and are fundamental to ensuring reliable power supply. With the rapid development of the national economy, the demand for transformers will continue to increase. However, with the increase in the installed capacity of power transformers, the energy they consume is also increasing, which is inconsistent with China's advocacy for building an energy-saving society. It is necessary to adopt corresponding technical measures to reduce the losses of transformers themselves, therefore, researching methods to reduce transformer losses has become very necessary.

03-20

2024

Interphase fault between transformer leads and adjacent busbars

Currently, the Chinese power system typically uses three-winding transformers or autotransformers, and the vast majority are single-phase transformer units. Interphase backup protection is configured to clear interphase faults on transformer leads and adjacent busbars. Because the transformers are single-phase transformer units, and both the transformer and line main protections are configured in a dual redundant manner, the interphase backup protection of the transformer is configured according to simplified principles.

02-22

2024

What does the launch of the carbon market mean for the power industry?

As early as 2010, the State Council clearly proposed to "establish and improve the trading system for major pollutants and carbon emissions" in the "Decision of the State Council on Accelerating the Cultivation and Development of Strategic Emerging Industries." The carbon emission trading system in China has a practical legal basis and foundation. Subsequently, in 2011, the State Council and the National Development and Reform Commission successively issued documents approving pilot carbon emission trading programs in seven provinces (cities): Beijing, Tianjin, Shanghai, Chongqing, Hubei, Guangdong, and Shenzhen.

01-16

2024

Small and medium-sized transformers: Future industry development direction

Mainly focusing on small and medium-sized products, this new type of distribution transformer has been recommended for use in urban and rural grid renovations. It is a seventh-generation energy-efficient product. Other products include wound core transformers, amorphous alloy transformers, fully sealed transformers, combined transformers, dry-type transformers, high-flash-point oil transformers, and gas-insulated transformers.

12-22

2023

The development of the power industry necessitates the high-end development of the transformer oil industry.

The rapid development of China's power industry necessitates the high-end development of the transformer oil industry. In recent times, the acceleration of projects such as West-to-East power transmission, inter-regional power supply, and cross-regional power grids has driven the rapid development of China's power transmission and distribution equipment industry. Simultaneously, the continuous expansion and upgrading of urban and rural power grids have led to a surge in demand for transformers, making transformer oil one of the fastest-growing lubricating products. The quality of transformer oil directly determines the operation and service life of transformers, and its performance requirements are constantly improving with the development of transformers.

12-13

2023

Transformer special inspection items

When a short circuit fault occurs in the power system or the weather suddenly changes, the personnel should conduct a spot check on the transformer and its auxiliary equipment. I. Inspection after a short circuit or transformer accident in the power system. Check the transformer for any explosions, displacement, deformation, burnt smell, flashover, oil spraying, etc., whether the oil temperature is normal, whether the external insulation is broken, and whether the grounding wire is burnt.

11-22

2023

Basic protection knowledge of transformers

Transformer internal faults mainly include inter-turn short circuits, turn-to-turn short circuits, and ground short circuits in the neutral point grounding system. These faults are very dangerous because the high temperature electric arc generated by the short-circuit current will not only burn the winding insulation and iron core, but also decompose the insulating materials and transformer oil, producing a large amount of gas, which may cause local deformation or rupture of the transformer oil tank, or even an explosion. Therefore, when a transformer has an internal fault, it must be quickly cut off. This must be remembered.

10-18

2023

Ten key points for daily maintenance of transformers in operation

Transformers require regular maintenance during operation, adhering to the "look, listen, smell, touch, and measure" five-point principle for careful inspection. What specific inspection items are involved?

09-20

2023