Reasons for The Classification of Diesel Generator Sets 1

There are many classification methods for diesel generator sets, which can be divided into large, medium, and small units according to the engine speed, high and low speed, and power. According to the output voltage frequency of the generator, it can be divided into AC generator sets (intermediate frequency: 400Hz, power frequency: 50Hz) and DC generator sets. When the voltage frequency is 50Hz, the calibration voltage of small and medium-sized generators is generally 400V (three-phase) or 230V (single-phase), and the calibration voltage of large generators is generally 6.3-10.5kV. But the more commonly used classification method is based on the control mode, purpose, and appearance structure of diesel generator sets.

Classified by control method

1. Manual units are the most common type of units, which have automatic voltage and speed adjustment functions. Operators can start, close, open, and stop the units on site in the machine room. This type of unit is usually used as a main or backup power source.

2. The self starting unit is an automatic control system added to the manual unit. When there is a sudden power outage, the unit has functions such as automatic start, automatic voltage regulation, automatic frequency modulation, automatic switch on/off, and automatic shutdown; When the oil pressure of the unit is too low, the oil temperature and the cooling wood temperature are too high, it can automatically emit sound and light alarm signals. When the unit overspeeds, it can automatically stop and protect the unit. The advantage of a self starting unit is that it greatly reduces the dependence on operators and shortens the interval between mains power interruption and power supply by the unit. Such units are usually used as backup power sources.

3. The microcomputer controlled automation unit consists of a high-performance diesel engine, synchronous generator, fuel (oil, cooling water) automatic compensation device, and automatic control panel. The automatic drawing screen is controlled by a programmable logic controller (PLC), which not only has various functions of self starting the unit, but also can automatically increase or decrease the unit according to the load size, automatically handle faults, automatically record the operation report and fault situation of the printer unit, and implement comprehensive automatic control of the unit. The remote control, remote signaling, and telemetry (commonly known as "three remote") of scattered units at the central station are achieved through serial communication interfaces (RS232, RS422, or RS485), thus achieving unmanned operation. The degree of automation of the unit can be configured according to actual needs. This type of unit is particularly suitable for use as an emergency power source.

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