Generator sets used in the telecommunications industry generally include mobile diesel generators and stationary diesel generators. They are widely used in computer rooms and data centers. By function, they are categorized into standard generator sets, automated generator sets, monitored generator sets, automatic transfer generator sets, and automatic parallel generator sets. By structure: open-frame generator sets, enclosed generator sets, and mobile generator sets. Enclosed generator sets can be further classified into: rainproof enclosed generator sets, low-noise generator sets, ultra-quiet generator sets, and containerized power stations. Mobile generator sets can be classified into: trailer-mounted mobile diesel generator sets and vehicle-mounted mobile diesel generator sets.
Product Requirements and Challenges
1. Automation Functions
Automatic Start-up and Automatic Load Engagement
The unit automatically starts upon receiving an automatic or remote start command, with a start-up success rate exceeding 99%. A start-up cycle consists of three start attempts, with an interval of 10–15 seconds between attempts;
After successful start-up, the unit should automatically engage the load when the oil pressure reaches the specified value; the load engagement time is typically 10 seconds;
If the unit fails to start after three attempts, it will cease further attempts and issue a start failure alarm signal; if a standby unit is available, the start command should be transferred to the standby unit.
Automatic Unloading and Shutdown
Upon receiving an automatic or remote shutdown command, the unit can automatically unload and shut down. There are two shutdown modes: normal shutdown and emergency shutdown. Normal shutdown procedure: Disconnect the main circuit (trip the circuit breaker or switch the ATS to the utility power side); Emergency shutdown procedure: Immediately disconnect the main circuit and fuel supply.
The unit is equipped with automatic protection against low oil pressure, overvoltage, overspeed, overload, short circuit, and phase loss. Water-cooled units feature high water temperature protection, while air-cooled units feature high cylinder temperature protection.
2. Remote Monitoring Function
Meets technical requirements for remote monitoring, featuring telemetry, telecontrol, and remote signaling capabilities. It enables real-time, long-distance monitoring of the unit's operating parameters and status. In the event of abnormalities or severe faults, it automatically alerts the monitoring system and allows for remote control of the unit. It supports standard communication protocols.
3. Series and Parallel Operation Functions
Series Backup Function: Can be integrated with an ATS (Automatic Transfer Switch) to achieve automatic switching between mains power and the diesel generator set, or dual-standby switching between two diesel generator sets.
Parallel Expansion Function: Two or more three-phase generator sets of exactly the same specifications and models can operate in stable parallel mode within a range of (20–100%) of rated power at the rated power factor. To improve the accuracy of active and reactive power distribution and operational stability, the diesel engine governor in the unit must be equipped with a device capable of adjusting the steady-state speed variation within the range of (2–5). The voltage regulation device within the control cabinet (panel) allows the steady-state voltage regulation rate to be adjusted within a range of 5.
4. Operating Conditions
Operable at altitudes below 3,000 meters;
Ambient temperature range: minimum -15°C, maximum 40°C; units for other ambient conditions are available upon request.
5. Stable Performance and High Reliability
The unit's mean time between failures (MTBF) is no less than 2,000 hours.
6. Convenient Fueling Facilities and Safety Measures
The unit is equipped with an external fueling system featuring a lockable mechanism;
A large fuel tank is typically required to support 12–24 hours of operation.
Solution
This high-performance, stable generator set features a low-noise design and is equipped with a PLC-5220 control system with AMF functionality. By connecting to an ATS, it ensures that the communication station receives immediate power from the backup system in the event of a main power failure.
Advantages
Comprehensive product and solution offerings reduce technical requirements for users, making unit operation and maintenance simpler and easier;
The control system features AMF functionality for automatic startup, along with multiple monitoring-based automatic shutdown and alarm functions;
Optional ATS; smaller units can be equipped with a built-in ATS;
Ultra-low noise operation; noise levels for units below 30 kVA are 60 dB(A) or lower at 7 meters;
Stable performance; the average time between failures (MTBF) is no less than 2,000 hours;
Compact unit size; optional accessories are available to meet operational requirements in cold and high-temperature regions;
Custom design and development are available to meet the specific needs of certain customers.