Prevention of Backfeeding in Diesel Generators

Definition of Backfeeding: Backfeeding refers to the situation where a self-provided diesel generator feeds electricity back into the municipal power grid.

Switching Devices Between Diesel Generators and Municipal Power: Three main switching methods are used: double-throw knife switches, mutually interlocked circuit breakers, and automatic transfer switches. Users must install an independent grounding device for the generator set, serving as both protective grounding and repeated grounding. This grounding device not only prevents electric shock hazards caused by generator leakage but also crucially avoids neutral point drift when the generator’s load is three-phase unbalanced. If the transformer’s working grounding is poor, backfeeding into the power grid may occur. Although the neutral drift voltage is not high, it can be stepped up by the transformer, posing a lethal threat to maintenance and construction personnel.

Consequences of Backfeeding from Self-provided Diesel Generators:

1.If the municipal power grid is not blacked out: The grid power supply and the self-provided generator power supply will form an asynchronous parallel operation, inevitably damaging the generator set. If the generator capacity is large, it may even cause grid instability.

2.If the municipal grid is blacked out and under maintenance: Backfeeding from the self-provided generator will result in fatal electric shocks to power supply department maintenance personnel.

Preventive Measures for Backfeeding:

To avoid such accidents and protect power generation equipment, Dingbo Power reminds users to strictly follow generator operation rules. The following management measures for diesel generator sets should be implemented:

1.Strengthen publicity on laws and regulations regarding self-provided generator management, and strictly comply with the Power Supply Business Rules.

2.Publicize lessons learned from personal injury accidents caused by poor generator management to raise awareness of the severe hazards of backfeeding and the importance of prevention.

3.Enhance management of the generator’s power supply scope: strictly prohibit unauthorized wiring and prevent users from resupplying electricity generated by the set to other users.

4.Improve training for on-site electrical operators to ensure they are proficient in the switching operation procedures of diesel generator sets.

5.Regularly inspect and maintain anti-backfeeding devices; conduct safety tests on electrical interlocking devices at least annually to ensure reliable operation.

Guangxi Dingbo Power Equipment Manufacturing Co.,Ltd was founded in 1974 and is one of the earliest manufacturers of generators and diesel generator sets in China. The company has a registered capital of 218.88 million yuan. The company covers an area of 86,000 square meters and a building area of 55,000 square meters. There are more than 660 employees, including 456 professional technicians and 106 senior technicians. It has 46 sales and service outlets nationwide. The main products are diesel engines, generator sets, and diesel generators, providing users with a one-stop service of design, supply, debugging and maintenance at any time. Dingbo has always insisted on using first-class talents, building first-class enterprises, manufacturing first-class products, creating first-class services, and making every effort to build a first-class domestic enterprise. If any question please feel free to visit our website https://www.dieselgeneratortech.com/ or send email to [email protected].