Diesel generator set type and functionDiesel generator set
In a communication system, switches and other dc and ac loads are powered by municipal power. The dc load is provided by the city power rectifier. If the power supply is interrupted, the ac load will be cut off synchronously and the work will be stopped immediately. The working time of the dc load provided by the battery group is limited. As the capacity of the battery decreases gradually, the dc load will stop working soon. Therefore, it is very important to generate electricity and turn on the power supply in time when the city power is out of power.
An overview of the
Diesel generator set is a type of ac power supply equipment of self-owned power station. Because it is flexible, less investment, can start at any time wait for a characteristic, is widely used in communications, mining, road construction, forest, farmland irrigation and drainage, field construction and national defense engineering departments.
Composition of diesel generators
Diesel generator set consists of two parts: diesel engine and generator. Diesel engine as power, driven by three-phase ac generators, diesel engine and generator through the coupling in together, so that diesel engine at 1500 revolutions per minute (generators for the two pairs of poles) drag the synchronous generator, the generator of 330 v / 220 v, 50 hz alternating current (ac), through the power cable, sent to the generator power distribution panel, through the mains power cable to the machine conversion screen, the screen to ac distribution panel, assigned to the load.
The type and function of the unit
There are many types of oil generator units, which can be divided into the following types according to their structural forms, control modes and protection functions.
1. Basic unit
Such units are the most common, the diesel engine, enclosed water tank, fuel tank, muffler, synchronous ac generator, excitation voltage regulating device, control box (screen), coupling and chassis, etc. The unit has the function of voltage and speed automatic adjustment. It can be used as main power source or backup power source.
2. Self-starting unit
The unit is based on the basic unit to add automatic control system. It has the function of automation. When the power is suddenly cut off, the unit can start automatically, switch automatically, operate automatically, send electricity automatically and stop automatically. When the oil pressure is too low, the oil temperature or the cooling water temperature is too high, the alarm signal can be sent automatically. When the unit overspeed, can automatically stop the emergency protection.
3. Microcomputer control automation unit
The unit consists of a diesel engine with perfect performance, a three-phase brushless synchronous generator, an automatic fuel supply device, an automatic oil supply device, an automatic cooling water supply device and an automatic control screen. The automatic control screen is controlled by PLC with programmable automatic controller. It besides have since the launch, switching, since since the operation, the investment and the downtime, and other functions, and is equipped with all kinds of fault alarm and automatic protection device, in addition, it through RS232 communication interface, and the main computer connection, for centralized monitoring, realize the remote control, remote and remote sensing, achieve unattended.
The structure of the unit
Modern diesel engine generator set consists of diesel engine, three-phase ac brushless synchronous generator, control box (screen), the cooling water tank, coupling, fuel tank, muffler and public base components such as rigid as a whole. Except the control panel and fuel tank of the high-power unit are designed separately, the other main parts are installed on the common base welded by the section steel, which is convenient to move and install.
The axial direction of the flywheel housing of diesel engine and the front cover of the generator is directly connected by the convex shoulder positioning. This kind of connection is fixed together by screws, so that the two are connected into a rigid body, ensuring the concentricity between the crankshaft of diesel engine and the rotor of generator within the specified allowable range.
In order to reduce the vibration of the unit, vibration dampers or rubber dampers are usually installed at the joint between the main components such as diesel engine, generator, water tank and electrical control box and the common bottom frame.