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Power Transformer Basics
1. Classification and models of power transformers2. 1. Classification by use3. (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.
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.
The most complete explanation of transformer cooling system
The cooling system of the power transformer consists of two parts: the internal cooling system, which ensures that the heat of the winding and the iron core is dissipated into the surrounding medium; the external cooling system, which ensures that the heat in the medium is dissipated to the outside of the transformer. According to the size of the transformer capacity, the medium and the type of circulation, the transformer adopts different cooling methods.
Transformer No-load/Load Test Introduction
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.
From classification to wiring mode, the most comprehensive explanation of grounding transformer
The grounding transformer is referred to as grounding transformer for short. According to the filling medium, the grounding transformer can be divided into oil type and dry type; According to the number of phases, the grounding transformer can be divided into three-phase grounding transformer and single-phase grounding transformer. The function of the grounding transformer is to provide an artificial neutral point for the system with ungrounded neutral point, which is convenient for the use of arc suppression coil or small resistance grounding mode, so as to reduce the capacitance current to ground in case of grounding short circuit fault in the distribution network and improve the power supply reliability of the distribution system.
Do you know what conditions are required for the parallel operation of transformers?
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.
When does magnetizing inrush current occur in transformers?
01 Inrush currentWhen 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).
Analysis of Transformer Protection in Relay Protection
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.
The harm of transformer oil seepage and its treatment methods
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.
Troubleshooting of abnormal phenomena in transformers
Analysis of abnormal operation of transformersTransformer sound 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.
How to configure transformer capacity, ten years old electrician tell you these rules!
In AC circuit, there are three concepts of electric power: active power, reactive power and apparent power. KVA stands for apparent power, which includes reactive power and active power. KW stands for active power, and kVar stands for reactive power. The relation between kW and kVar and conversion there is a concept - power factor cos ф, active power kW=UIcos ф, reactive power kVar=UIsin ф, and apparent power kVA=UI(U is voltage, I is current).

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