What is The Three Phase Four Wire System of Diesel Generator Set?

As a device to compensate for the shortage of mains electricity, diesel generator sets are often used as backup or emergency power sources in the power system. They adopt a three-phase four wire system for power supply, and many users may have a vague understanding of what the so-called three-phase four wire system means. Therefore, in this article, Dingbo Power will provide you with a detailed introduction.

The so-called three-phase four wire system refers to having four wires, of which three are live wires and the other is neutral wire. When connecting, there are two methods: star shaped and triangle shaped, which bring good results. A symmetrical power supply between three phases is capable of providing three AC power sources with the same frequency and magnitude, and a phase difference of 120 degrees in electromotive force. The current supplied by a three-phase power source is called a three-phase circuit.

In the three-phase four wire system, whether it is the N wire or the PE wire, repeated grounding is required at the user's location to increase the reliability of use. However, it should be noted that repeated grounding requires connection near the grounding position, and cannot be connected at any position.

Precautions for the operation of three-phase four wire system configuration

1. The conformity of three-phase production requires maintaining balance, whether it is on the main line or branch line, the degree of imbalance generated should be controlled within 20%, in order to avoid damage and increase in voltage and power.

2. The neutral wire connection of the neutral wire must not have any problems, and fuses cannot be installed. During use, it is necessary to avoid poor contact or disconnection issues. Single phase electrical facilities that are not thermally connected to the circuit may fail to function due to high voltage.

3. When connecting the phase line and neutral line, it is important to ensure that they are not connected incorrectly, otherwise it may cause electrical equipment to burn out. Moreover, three-phase motors may burn out due to reduced torque, affecting their normal use.

The above is the explanation of the three-phase four wire system terminology for diesel generator sets introduced by Dingbo Electric Power. In recent years, with the continuous expansion of the application scope of diesel generator sets, they are often used in places where commercial power cannot meet the demand, or as emergency power sources for fire protection, outdoor mobile construction, etc. Therefore, it is particularly important to distinguish the relevant parameters of the unit and use them correctly.

Guangxi Dingbo Power Equipment Manufacturing Co.,Ltd is an early professional manufacturer of generators and diesel generator sets in China. The company has first-class national-level large-scale production and load testing equipment. Provide users with long-term diesel generator set sales, leasing, technical consultation, commissioning, maintenance, training services and generator set trusteeship business. If you would like to get more information welcome to contact us via sales@dieselgeneratortech.com.