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Discussion on short-circuit current breaking capacity of low-voltage side circuit breakers of distribution transformers

The short-circuit current breaking capacity of the low-voltage side circuit breaker of the distribution transformer is too small; the influence of the thermal stability current of the cable is not verified in the low-voltage distribution system, which leads to the small cross-sectional area of some distribution circuit cables in the low-voltage distribution system.

September 13, 2022
About transformers, you have to master the knowledge points!

1. What is a transformer?In the AC circuit, the device that increases or decreases the voltage is called a transformer. The transformer can convert any value of voltage into the voltage value we need with the same frequency to meet the requirements of electric energy transmission, distribution and use.For example, the electricity from a power plant has a low voltage level, and the voltage must be increased before it can be transported to a distant power consumption area. The power consumption area must be reduced to a suitable voltage level to supply power equipment and daily electricity. Equipment.

August 25, 2022
Transformers Classic 50 Questions

1. What are the main components of oil-immersed transformers?Answer: The main components of the transformer are: iron core, winding, fuel tank, oil pillow, respirator, explosion-proof pipe, radiator, insulating sleeve, tap changer, gas relay, thermometer, net oil, etc.

August 18, 2022
Measures to improve the short-circuit resistance of power transformers

The power transformer is the hub of transmission and distribution of electric energy, and the core component of the power grid. Its reliable operation is not only related to the power quality of the majority of users, but also to the safety of the entire system. The reliability of a power transformer is determined by its health status, not only depends on the design and manufacture, structural materials, but also closely related to the overhaul and maintenance. The problem of improving the short-circuit resistance of transformers in power systems is discussed.

July 19, 2022
The difference between the action principle of the main variable light and heavy gas protection

Corresponding protection devices shall be installed for the short-circuit faults of the transformer lead wires, bushings and internals, and shall meet the following requirements: 1) The single-running transformer of 10MVA and above and the parallel running transformer of 6.3MVA and above should be equipped with longitudinal differential protection. Important transformers with 6.3MVA and below operating independently can also be equipped with longitudinal differential protection.2) Transformers below 10MVA can be equipped with current quick-break protection and overcurrent protection. For transformers of 2MVA and above, when the current quick-break sensitivity coefficient does not meet the requirements, longitudinal differential protection should be installed. 3) 0.4MVA and above, the primary voltage is 10kV and below, and the coil is a transformer with a delta-star connection, and a two-phase three-relay type overcurrent protection can be used.4) The various protection devices specified in this article shall operate to disconnect the circuit breakers on each side of the transformer.

June 20, 2022
Must see! A comprehensive explanation of the composition, structure, oil system and fault operation and maintenance

Oil-immersed transformers have the characteristics of good heat dissipation, low loss, large capacity and low price. At present, most of the power transformers running on the grid are oil-immersed transformers, of which more than 80% are cooled by natural oil circulation. It is a commonly used cooling structure to set a guide plate in the coil of a natural oil circulation transformer. This paper focuses on analyzing the structure, operation and maintenance of oil-immersed power transformers, and specifically analyzes the oil system of oil-immersed power transformers, and briefly analyzes the faults of oil-immersed power transformers. Hope to increase understanding and analysis of my country's oil-immersed power transformers.

June 08, 2022
When the transformer core is stacked, what are the seam methods? When the transformer core is stacked, what are the seam

When the transformer core is stacked, what are the seam methods? What are the characteristics of each? This article starts from the popular science of iron cores, and expands and expands to check the seam method of silicon steel sheets when the transformer iron cores are stacked. (If there are any mistakes or additions, please leave a message at the end of the article)

May 30, 2022
How to judge and deal with these abnormal phenomena in transformers?

1. Analysis of abnormal operation of transformers(1) The sound of the transformer is abnormalAs soon as the transformer is connected to the power supply, there will be a buzzing sound, which is mainly due to the effect of high-voltage magnetic flux. During normal operation, the sound of the transformer is uniform. When there are other noises, you should carefully find the cause and deal with it.

May 25, 2022
Detailed explanation of transformer silicon steel sheet!

Commonly used transformer cores are generally made of silicon steel sheets. Silicon steel is a kind of steel made of silicon (silicon is also called silicon), and its silicon content is 0.8 to 4.8%. The iron core of the transformer is made of silicon steel because silicon steel itself is a magnetic material with strong magnetic permeability.

May 23, 2022
What impact might the Russian-Ukrainian conflict have on the motor industry? Supplier

Russian President Vladimir Putin signed an order on the evening of the 21st to recognize the "Donetsk People's Republic" and "Luhansk People's Republic" in eastern Ukraine. On the 24th local time, Russian President Vladimir Putin said in an emergency televised speech that he had decided to conduct a special military operation in the Donbas region.

March 07, 2022
How much KW power consumption can a 1000KVA transformer withstand?

Question:"There is an old-fashioned transformer of 1000KVA with an existing load of about 200KW. If a new load of about 600KW is to be added, can this transformer withstand it?"

May 18, 2022
Inventory! 7 types of fault judgment methods and solutions for dry-type transformer noise, worth collecting!

This article mainly counts 7 types of fault judgment methods and solution analysis of dry-type transformer noise. If there is any error or omission, please point it out in the comment area.Analysis of 7 types of fault judgment methods and solutions for dry-type transformer noise➢Resonance problems of fans, casings and other components➢Installation problems➢Influence of installation environment➢The problem of vibration of busbar bridge➢Transformer core resonates by itself.➢Transformer coil self-resonance➢The problem of the nature of the load

May 13, 2022

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