High-Voltage Generator Set Control and Protection Systems

High-voltage generator sets play a crucial role in critical power supply and emergency power provision. Their startup, shutdown, and operational protection functions directly impact the reliability and stability of the equipment. This article will introduce the startup and shutdown control, protective functions, control systems, structural safety configurations, as well as real-time monitoring and remote control capabilities of high-voltage generator sets.

Startup and Shutdown Systems

The startup system of high-voltage generator sets is powered by a battery bank equipped with a float charge module, ensuring continuous charging of the batteries in non-operational states to maintain sufficient power. The startup devices provided by the manufacturer can successfully start the generator set within three attempts at normal temperatures, ensuring rapid power supply during grid failures or emergencies. To enhance startup reliability, the battery capacity is designed to support continuous starts of the diesel generator for more than six times in cold conditions, with a 10-second interval between each start. The automatic startup success rate of the unit is no less than 99%, supporting manual and automatic start-up switching, and equipped with manual and emergency shutdown functions. These designs ensure efficient response and safety of the generator set under any circumstances.

Protective Functions

High-voltage generator sets are equipped with a comprehensive fault protection system, divided into minor and major faults.

1. Minor Fault Protection

When minor faults such as high cooling water temperature, high oil temperature, low oil pressure, overload, or start failure occur, the system issues audio-visual alarms, and operators can choose to manually or automatically shut down to prevent equipment damage.

2. Major Fault Protection

For serious faults such as severely high cooling water temperature, severely high oil temperature, extremely low oil pressure, or overspeed, the system will automatically perform an emergency shutdown and issue a warning to prevent the fault from worsening and ensure safety.

Additionally, the generator automatically trips and alarms when encountering power system faults (such as differential protection, overcurrent, power bus short circuit, phase loss, voltage anomalies, loss of excitation, high frequency, or reverse power, etc.), ensuring stable operation of the power system.

Voltage Regulation and Monitoring Functions

The generator set is equipped with voltage regulation and protection devices, providing multiple layers of electrical protection, including grounding, differential protection, overcurrent protection, short circuit protection, reverse power protection, undervoltage and overvoltage protection, etc. The measuring instruments in the high-voltage cabinet display real-time power parameters such as voltage, current, frequency, power, power factor, and energy consumption, ensuring safe operation of the unit and stable power output.

Control System Functions

High-voltage generator sets utilize advanced microcomputer control technology with LCD or digital display methods, offering comprehensive parameter monitoring, including current, voltage, frequency, water temperature, oil pressure, speed, and power factor. The system supports automatic synchronization and parallel operation of multiple units, capable of automatically distributing active and reactive power, achieving load balancing. Auxiliary equipment (such as fuel systems, lubrication systems, cooling systems, speed and voltage regulation devices, etc.) are also under monitoring and regulation, ensuring stable operation of the equipment under various conditions.

The control system can also display detailed operational parameters, including three-phase output voltage, current, power factor, output frequency, reactive compensation value, power generation, bus/bar power voltage, bus/bar power frequency, and battery voltage. When parameters exceed the set range, the system will alarm and record fault history for reference in routine maintenance. The automatic float charger continuously charges the battery, ensuring the emergency startup capability of the high-voltage generator set; when the ambient temperature is low, the preheating device automatically starts to ensure normal operation in low-temperature environments.

Structure and Safety Configuration

The structural design of high-voltage generator sets meets high stability and safety requirements, equipped with dedicated shock absorption devices, conforming to seismic engineering standards, and suitable for high-intensity earthquake conditions. The unit adopts dual mechanical and electronic overspeed protection measures to prevent accidents caused by engine overspeed. The control cabinet has safety interlock protection functions, such as low oil pressure shutdown and overspeed shutdown, with internal components from well-known domestic brands to ensure electrical performance and reliability. The cabinet also includes an automatic dehumidifying heater system to ensure stable operation in humid environments.

Real-time Monitoring and Remote Control

The real-time monitoring system of high-voltage generator sets supports operation via computer or mobile phone networking, facilitating remote viewing of equipment operation status. The system monitors parameters such as voltage, current, frequency, power factor, and power in real-time and can perform data analysis on the server backend. When abnormal conditions are detected, the system immediately alarms, facilitating a rapid response from staff to prevent potential faults. Real-time monitoring and remote control functions greatly enhance the intelligence level of the equipment, achieving round-the-clock monitoring and timely prevention and control.

Conclusion

The startup and shutdown system design of high-voltage generator sets ensures rapid response for emergency power supply, and comprehensive fault protection functions ensure the safety of equipment and personnel. Its microcomputer control and real-time monitoring systems enhance the level of intelligence and management efficiency, meeting the high demands of power systems. Through remote monitoring, comprehensive control of equipment status is achieved, providing high reliability and safety for critical applications.