Three Phase Unbalance of Cummins 300KW Diesel Generator

If you look closely at the technical parameters of diesel generator sets, you will notice that the connection method of most diesel generator sets is three-phase four-wire. So what does three-phase four-wire mean? The 10-kilovolt high voltage output from the substation is input to the transformer and stepped down to 380V voltage. It is divided into three wires of yellow, green, and red phases. Then there is also a neutral wire coming out of the transformer. This wire is called the neutral line. The composition of these four wires is the three-phase four-wire system. Generally, this three-phase four-wire system is supplied to factories, schools, hospitals, and for civil use.

Under normal circumstances, if a pure copper motor is equipped and the power is matched with the diesel engine, it generally will not break down. However, many users do not pay attention to the wiring method of the load they are carrying during use, resulting in an unbalanced three-phase of the Cummins 300KW diesel generator set. Over time, problems are likely to occur in the generator set. What does three-phase imbalance mean? Since the electricity output by the Cummins 300kw diesel generator is three-phase four-wire, the currents output by the three wires generally need to be approximately the same. If the difference is significant, an imbalance occurs. At this time, the following situations will occur:

What will happen when the diesel generator has a three-phase imbalance?

1.First of all, it affects the operation of the equipment. The capacity of the diesel generator set is set according to the three-phase load. If the three-phase load is unbalanced, the equipment can only be limited by the phase with the largest load. Therefore, the output power of the diesel generator decreases and cannot meet the power requirements of users.

2.The three-phase voltage is asymmetrical, causing the neutral point potential of the generator set to shift.

3.The neutral current is too large, causing the operating temperature of the distribution transformer to rise. In severe cases, the transformer may be burned out.

4.The voltage of some phases is high, while the voltage of other phases is low.

5.Burn out the generator and affect normal power supply.

6.There is current flowing through the neutral line, increasing the loss of the low-voltage power supply line itself.

Therefore, when using a diesel generator set, it is necessary to pay attention to avoiding three-phase imbalance. If there is no way to change its output power, the wiring method should be frequently changed to prevent damage to the generator set.

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