Socaciu Viorica Doc. Use of symbols Safety notes Explanations of abbreviations and terms
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Index 1. Description of ATS Field of application Application example Introduction Over the past few years, service continuity in low voltage electrical installations has played an increasingly leading role. In actual fact, this requirement is a fundamental characteristic if economically and functionally efficient installations are to be created. A system able to switch the supply from the main line to an emergency line reduces problems caused by faulty conditions in the public network to the minimum.
To achieve automatic transfer switching, the installation can be fitted with an Automatic Transfer Switch ATS available in versions and featuring microprocessor-based technology. If the main line is lost, this device can control generator startup and can handle switching from one network to another by means of the commands transmitted to the circuit-breakers. This White Paper deals with the concept of automatic switching in plant engineering and then continues with a practical analysis so as to explain how the ATS units integrate with all the devices involved in the switching process.
Description of ATS As mentioned previously, to achieve automatic switching, the installation can be provided with an Automatic Transfer Switch ATS available in versions and with microprocessorbased technology. This solution has been designed to ensure a high degree of reliability thanks to the intrinsic safety systems linked to the operation of the software and hardware. The switching logic is inhibited and an alarm is activated if the state of a circuit-breaker or a switch-disconnector operating as the actuator of the system fails to match the command transmitted by the ATS.
Moreover, use of the mechanical interlock prevents any parallel between the main and the emergency line from occurring. The ATS unit continuously monitors the voltage value of the system and automatically switches to the generator or transformer, after a preset delay.
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