250kva three phase transformer

250kva three phase transformer
250kva three phase transformer
250kva three phase transformer
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The description of 250kva three phase transformer

In order to input different voltages, the input winding can also use multiple windings to adapt to different input voltages. At the same time, multiple windings can be used to output different voltages. Three independent windings, through different connection methods to make it input three-phase AC power and its output is the same, this is 250kva three phase transformer.

The three-phase group transformer, as shown in Figure 1 that is composed of three single-phase transformers connected in three phases on the circuit and the main magnetic flux of each phase forms a separate loop along the respective iron core which has nothing to do with each other. Therefore, when a 250kva three phase transformer voltage is applied to the primary winding of a three-phase group transformer, the three-phase main magnetic flux is symmetrical. Because the 250kva three phase transformer iron core is the same, the three-phase no-load current is also strictly symmetrical.

The applications of 250kva three phase transformer

250kva three phase transformer are widely used in circuits with AC 50Hz to 60Hz and voltages below 660V. They are widely used in imported important equipment, precision machine tools, mechanical and electronic equipment, medical equipment, rectifiers, lighting, etc. The various input and output voltage levels of 250kva three phase transformer. The connection group, the number and position of the adjustment taps (usually ± 5%), the distribution of winding capacity, the provision of secondary single-phase windings, the use of rectifier circuits and whether the belt and so on that can be carefully designed and manufactured according to user requirements.

The features of 250kva three phase transformer

The establishment of a new neutral-grounding in 250kva three phase transformer can relieve the common mode interference and other neutrals in the power grid. 250kva three phase transformer converts the three-wire △ wiring into a four-wire Y0 system, and the shielding further eliminates the high frequency coupled by the transformer.Although the 250kva three phase transformer can effectively prevent the interference (pulse and high frequency noise) from various NG, the transformer must be properly grounded or the common mode interference will be ineffective.

The using condition of 250kva three phase transformer

1. Applicable altitude: ≤5000m.

2. Ambient temperature: -15 ℃ ~ + 45 ℃.

3. Relative humidity: ≤90%.

4. The installation should be free of gases, steam, chemical deposits, dirt, conductive dust, conductive dust and other materials that seriously affect the insulation strength of the 250kva three phase transformer.

The using introduction of 250kva three phase transformer

1. Transformer connection method and connection group.

2. There are two different phase angles for the domestic 60 and 35kV transmission system voltages.

250kva three phase transformer must adopt the YN, yn0, yn0 connection method, and there must be a fourth winding connected in an angular connection in the transformer and its leading end is not led out (the lead out when the electrical test is to be done on the structure is not in this case).

The high-voltage windings of 250kva three phase transformer used in domestic transformers are generally connected into a Y connection,and the connection between the medium-voltage winding and the low-voltage winding depends on the system. The so-called system condition refers to the relationship between the voltage phasor of the high-voltage transmission system and the voltage phasor of the medium-voltage or low-voltage transmission system. If the low-voltage power distribution system that can be determined according to the standards.

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