The switch must be turned off before starting the diesel generator set

在Diesel generator setOne point in the starting rules has been emphasized many times, that is, the switch must be turned off before starting. Many people expressed doubts about this regulation, and Haixing gave the answer. The main reason for doing this is to prevent the phenomenon of reverse power transmission.

What is the phenomenon of reverse power transmission, and what are the consequences of this phenomenon?

Each generator set will be equipped with a load output switch for the customer. Before the generator set is started, the load switch must be disconnected. Only when there is a power outage and there is no current on the grid, can the generator set be switched on The current is transmitted to the power grid. At this time, the power grid switch must be ensured to be in the off state, otherwise, when the mains power comes in, reverse power supply may easily occur.

The situation of self-prepared diesel generators delivering power to the city grid is called reverse power delivery. There are two serious consequences:

1) If there is no power outage from the city grid, the power supply of the city grid and the power supply of the self-prepared generator set will be paralleled out of synchronization, which will destroy the generator set. If the capacity of the self-provided generating set is large, it will also cause the municipal power grid to oscillate.

2) The municipal power grid has been out of power and is undergoing maintenance. If the self-prepared generator set sends power backwards, the maintenance personnel of the power supply department will be electrocuted.

Therefore, the rules for disconnecting the switch before starting must be strictly followed to avoid accidents. This point should be emphasized in the workshop operating regulations.