Transformer parallel running conditions:
1 voltage ratio is the same, tolerance ± 0.5%.
2 Impedance voltage values ​​differ by <±10%.
3 The wiring group is the same.
4 The capacity ratio of the two transformers does not exceed 3:1.
If the transformers operating in parallel do not meet the above conditions:
1 When the voltage ratio is different, the circulation will be generated when operating in parallel, which will affect the output of the transformer.
2 If the impedance voltages are not equal, the load cannot be distributed according to the capacity ratio, that is, when the transformer with a small impedance voltage is fully loaded, the impedance voltage is large.
3 The wiring group is inconsistent and will cause a short circuit.
4 transformer capacity difference is large, the impedance voltage will also vary greatly.
Parallel operation of transformers has the following advantages:
1. When multiple transformers are operated in parallel, if one of the transformers fails or needs to be repaired, the other transformers can share the load and continue to supply power, thus improving the reliability of the power supply.
2. According to the change of load in the power system, the number of transformers connected in parallel can be adjusted to reduce power loss and improve operating efficiency.
3. New transformers can be installed in batches according to the increase in electricity consumption to reduce initial investment. There are certain requirements for the parallel operation state of the transformer. The most ideal parallel operation is:
1. In the no-load, there is only the no-load current of the primary side in each transformer, and the loop consisting of the busbars of the secondary windings of each transformer passes through the busbar, and there is no circulating current in the primary loop.
2. The load shared by each transformer during load should be distributed proportionally to the size of each rated capacity to prevent one of them from being overloaded or underloaded.
3. The current shared by each transformer during load should be in phase with the total load current. Thus, when the total load current is constant, the current shared by each transformer is the smallest; if the current divided by each transformer is constant, the total load current is the largest.
To achieve the above ideal parallel state, the transformers operating in parallel must have the following three conditions:
1. The rated voltage of the primary side of each transformer should be equal, and the rated voltage of each secondary side should be equal, that is, the ratio should be equal;
2. The phase difference between the potential of the secondary side of each transformer and the potential of the primary side should be equal, that is, the connection group should be the same;
3. The impedance voltage of each transformer should be equal, and the short-circuit impedance angle should be equal.
Advantages of parallel operation of three-phase transformers:
1. The power grid has a large capacity. If a transformer is used, the volume needs to be made large, which has many problems in terms of technology, economy and transportation. A number of transformers can be used to share the capacity.
2, can guarantee the reliability of power supply. When a transformer fails or is repaired, it can be replaced separately and the mountain standby transformer is put into operation.
3, can adapt to the load change. Adjust the number of parallel operation of the transformer, reduce the no-load loss of the transformer, and improve the system's power supply compliance and power factor.
4, according to the year-on-year transformation of the load, appropriate investment. Reduce one-time investment. However, in the case of the same total capacity, it is uneconomical to have too many transformers operating in parallel, which complicates the operation.
The advantages of parallel operation of three-phase transformers are quite obvious, but there are certain requirements for parallel operation of three-phase transformers.
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