FANOX SIA-C User Manual

Also see for SIA-C: User manual

Contents

www.fanox.com Rev.26 108/1885.12.4. 24 Vdc or 48 Vdc auxiliary power supplyThe 24 Vdc auxiliary power is taken from the transformation centre RTU power supply. SIA-Cconsumes approximately 200 mW in normal operation and 300 mW if SCADA communicationis active. The consumption is so reduced that it practically does not charge the transformationsubstation battery of 24Vdc, being able to supply from it, with a total guarantee and withoutbeing a loss of functionality with communications equipments because it will extract 20mA/hour. Therefore, the equipment can be powered all the time, allowing it to be continuallymonitored (status, measurements of transformation centre current, events,…).The equipment is totally operational at this power and if a fault occurs, the trip time matches thetime setting. In a situation where the centre is deenergized, if this is energized and a faultinduced with the instantaneous function set at 20 ms, the trip time will be 20 ms.It is also available a wider range of power supply (85-265 Vac/Vdc) if it is required (selection &ordering data page 58 of this manual)5.13. Equipment starting up time. Fault trip time during starting up of theequipment.SIA-C is an electronic equipment, which provides a starting up time (time from equipmentactivation to operational capacity). Logically, it is a desirable to have a minimum time for thestarting up the equipment.Depending on cases, it is a desirable to assess the necessity of a fast tripping time during thestart of the equipment. For example, if the installation provides short-circuit fuses, it makes nosense a protection capable of tripping in extremely short times. In installations with guaranteedauxiliary voltage, the equipment gets the energy for the trip in a very short time. It also dependson the type of striker which will be used: there are strikers which need less energy for theiractivation.The most critical case is produced when there is self-power (without auxiliary voltage norbattery) and low current faults.In order to reduce to the maximum the SIA-C tripping time when there is a fault during theenergization of the equipment, the model SIACXXXXXXX2XX has developed (with non-volatileRAM memory and fast startup).The pickup time is 70 ms with fast startup and 140 ms with normal pickup.To sum up, there are a lot of factors which influence on the starting up time: self power,auxiliary voltage, tripping time…Next, we provide the trip curves for the specified conditions: