EN IEC 62793:2020 pdf free.Thunderstorm warning systems – Protection against lightning (IEC 62793:2020).
A lightning and surge protection study should be performed to ensure that direct lightning andinduced surges cannot affect the TWS, especially when a single thunderstorm detector is used.
lInstallation according to instructions and prior study are key factors for a successfulthunderstorm warning system.
For an LLS or a network of detectors based on single detectors, the maintenance is theresponsibility of the network operator.
For a single thunderstorm detector, the maintenance period of the TWs should be provided inthe manufacturer’s instructions and may depend on location and environment.Tests in Annex Eprovide information on how the sensor will resist environmental conditions (UV,marine andindustrial pollution, dust, etc).Maintenance of the systems integrated in a TWS, including alarmdelivery,is indispensable. The precision of the information provided by a TwS is directlydetermined by the physical conditions of its sensors, their environment (i.e. growing vegetation,buildings, towers,etc.), communication links between the sensors and the control unit as wellas between the Tws and end users.
NOTEMaintenance tasks can include for example: cleaning, re-adjustment of parameters,periodic calibration,verification of good operation, communication ability.
Real-time self-checking methods should be provided to ensure the TWS is still working properly.The provider of the TWS has to ensure that the full chain from lightning data acquisition to thedelivery of an alarm to the user is working properly.
Following the maintenance instructions is a key factor for a thunderstorm warning system longterm behaviour.
For an LLS or network of detectors based on single detectors, the performance evaluation isthe responsibility of the network operator.
By evaluating the operation of the TWS, it is possible to optimize its parameters and thenimprove the quality and the reliability. The alarm can thus be better adapted to the end-userapplications.
Performance evaluation provides valuable information for future alarm settings,preventiveaction improvements and increases the knowledge of the lightning environment at the target. Itis recommended that this performance evaluation be based on a procedure established by theTws manufacturer. In this procedure the user should provide information about previousexperiences when available (e.g. number of alarms, potential failure to warn, effective alarms,false alarms, damages) with a particular alarm set-up.
The evaluation can be performed in different ways depending on the availability of validationinformation, such as:
cross-correlation with other sources of information: data from other TWSs, meteorological
radar or satellite, etc.;
processing archived data to verify and adjust the settings of the alarm parameters.EN IEC 62793 pdf download.