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1. Classification and models of power transformers
2. 1. Classification by use
3. (1) Step-up transformer: used by the power plant to transmit electricity to the outside.
4. (2) Step-down transformer: The substation of the power supply bureau is used for voltage conversion.
5. (3) Distribution transformer: used to supply power to users.
6. (4) Plant transformer: Provides internal electricity for the power plant.
7. (5) Transformer for station: Provide internal electricity for the substation.
8. (6) Converter transformer: for DC power transmission, one side is connected to AC power, and one side is connected to the converter valve.
9. (7) Rectifier transformer: used in thermal power plants to supply power to electrostatic precipitators.

1. What does △/Y0-11 mean on the transformer nameplate?
Answer: According to the different connection methods of the primary coil and the secondary coil of the transformer, the phase angle of the line voltage on the primary side and the secondary side of the transformer is different. Transformer △/ Y0-11 means that the phase angle difference between the two line voltages of the transformer is 330°. It is customary to use the clock notation, that is, 11 o'clock.

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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

01 Inrush current
When a transformer is first energized, a phenomenon called magnetizing inrush occurs. Although inrush currents are generally not as disruptive as fault currents, the duration of magnetizing inrush currents is on the order of seconds (compared to periods with fault currents).

No-load test: Apply the rated voltage of the sine wave rated frequency from a certain winding of the transformer (generally from the secondary low-voltage side), and open the other windings to measure the no-load current and no-load loss. If the test conditions are limited and the power supply voltage cannot reach the rated voltage, the test can be performed under non-rated voltage conditions. This test method has a large error and is generally only used to check whether the transformer is faulty. Only the test voltage reaches more than 80% of the rated voltage. can be used to test the no-load loss.

Introduction
transformer
A device that changes voltage, current, or phase by coupling a magnetic circuit
Why learn Transformers?
Transformers are also known as stationary AC motors

The transformer is a static device in continuous operation, which is relatively reliable in operation and has less chance of failure. However, since most of the transformers are installed outdoors, and are affected by the load during operation and the short-circuit fault of the power system, various faults and abnormal situations inevitably occur during operation.

1. Analysis of abnormal operation of transformers
(1) The sound of the transformer is abnormal
As 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.

The parallel operation of transformers means that the primary windings of two or more transformers are connected in parallel on the busbar of the same voltage, and the secondary windings are connected in parallel on the busbar of another voltage.






Its meaning is: when one transformer fails, other transformers running in parallel can still continue to operate to ensure the power consumption of important users; or when the transformer needs to be repaired, the standby transformer can be connected in parallel, and then the transformer to be repaired is powered off and repaired. , which can not only ensure the planned maintenance of the transformer, but also ensure that the power supply is not interrupted and improve the reliability of the power supply.

There are two main causes of transformer oil leakage: on the one hand, problems left over in the process of transformer design and manufacturing process; On the other hand, leakage is caused by improper installation and maintenance of transformer. The main leakage parts of the transformer often appear at the radiator interface, flat butterfly valve cap, sleeve, porcelain bottle, weld, sand hole, flange and other parts.