Alternate operation of two generator sets
The use of generator sets in pairs, operating in dual mutual stand-by mode is a solution that is currently in high demand in the generator set sector, in applications where there are no mains or the supply is very weak or unreliable.
The setup for this application consists on any pair of generator sets offering remote start-up option. Both gensets will be connected to an ATS switchboard with a DSE 334 control unit. The DSE334 control unit programming will enable an alternate operation of the two gensets according to their stipulated timings and, if a failure occurs in one of them, the other one will start automatically and quickly replace it.
With this system, it is possible to:
- Ensure a prolonged and uninterrupted power supply.
- Carry out maintenance tasks without interrupting the power supply for long periods of time.
- Increase the useful life of the generator sets
When using a single generator set in applications where there are no mains and a constant power supply is required, there is a risk power supply failure due to an unexpected interruption of the genset operation or to a given maintenance work that requires the engine to be stopped. And, in the end, a continuous use of a single engine causes greater wear on the equipment, reducing its useful life.
Single-line diagrams of the two scenarios where this application is very useful:
A) Scenario in which there are no mains
The single-line diagram A shows two generators connected to 1 ATS DSE334 switchboard, which in turn is connected to the load it is supplying. Each one of them alternates the power supply according to the priority set in the DSE334 programming and, if one of them fails, the other genset will automatically start supplying power until the failing generator set is restored.
B) Scenario where there are weak or unreliable mains, or with regular failures.
In the case of single-line diagram B, there are mains available. A second ATS 2 DSE334 panel is added to the network, connected to the load, to the network, and to the ATS 1, which in turn is connected to the generator sets. The ATS 2 monitors the status of the mains so that, when the mains fail, the DSE334 on the ATS 2 sends a signal to start the gensets according to the priority set in their programming and the availability of such generator sets controlled by the DSE 334 on ATS 1.
REQUIREMENTS of the generator sets:
- Two generator sets of any kind with control panel offering the start-up by external signal
- Each of the gensets must feature preheating resistance and battery charger.
Note.- Each charger will supply the battery of the failing genset using the power generated by the genset in operation.
Automatic Switchboard that enables the alternate use of generator sets:
This panel has a DSE334 type control unit programmed to alternate the supply service of each of the G1 and G2 gensets that supply the installation. In addition, it detects failures in the generator set that is supplying the power, sending a start-up signal to the switchboard of the other generator set in stand-by, making the supply switch possible.
The changeover is made by two contactors or motorised selectors equipped with MECHANICAL and ELECTRICAL LATCHING.
The panel, provided in a metal cabinet with IP-67 protection, includes the following components:
- Two contactors or motorised selector, with mechanical and electrical latching, preventing both of them from being simultaneously closed, thus avoiding possible short-circuit situations.
- Protective fuses.
- Terminal block for controlling and operating the generator set.
- Terminal block of the generator set input power cables, mains input, and load output.
- Wiring connection of all electrical elements in the panel. Each wire is identified with its reference number at each end.
- Transformers
- Emergency stop pushbutton
- Starter switch (for control unit power supply)
- DSE 334 control unit
- Front door with locking key.
- Bottom cover for cable access.
The Rental and the Telecommunication Sectors are among the ones with the highest demand for this application.
Typical rental genset applications, such as construction, events, shows, as well as telecommunication systems usually located in remote areas where there are no mains are the typical scenarios where this is the perfect option.
Conclusion:
By using a simple system of accessories such as the ATS DSE334, it is possible to supply power in applications usually considered complex with any pair of generator sets or a fleet of rental gensets with regular control panels just featuring control units with start-up by external signal option available.