Rev. 06
46/99
6.10. Equipment starting up time. Fault trip time during starting up of the
equipment.
SIA-B is an electronic device, which provides a starting up time (time from equipment activation
to operational capacity). Logically, it is a desirable to have a minimum time for the starting up the
equipment.
Depending on cases, it is a desirable to assess the necessity of a fast tripping time during the
start of the equipment. For example, if the installation provides short-circuit fuses, it makes no
sense a protection capable of tripping in extremely short times. In installations with guaranteed
auxiliary voltage, the equipment gets the energy for the trip in a very short time. It also depends
on the type of striker which will be used: there are strikers which need less energy for their
activation.
This tripping time depends on the setting “Trip Voltage Level” as well. At equal supplied current
(low levels of current), a greater value of this setting implies a longer time to trip because the
equipment requires more time to achieve the necessary energy for the trip. At high levels of
current, this setting may have no effect on the tripping time because the energy is easy and
quickly achieved.
The most critical case is produced when the relay is self-powered (without auxiliary voltage or
battery) and low current faults.
To sum up, there are a lot of factors which influence on the starting up time: self-power, auxiliary
voltage, tripping time…
Next graphics provide different trip curves depending on the fault current and Trip Voltage Levels.
In the following image it is shown the result using CT16 but tis result is valid for the rest of the
CTs.
Summary of Contents for SIA B
Page 7: ...www fanox com Rev 06 7 99 2 DIMENSIONS AND CONNECTION DIAGRAMS 2 1 Frontal view...
Page 8: ...www fanox com Rev 06 8 99 2 2 Case dimensions The dimensions are in mm Cut out pattern...
Page 9: ...www fanox com Rev 06 9 99 2 3 Connection diagram NOTE STRIKER 6 24 Vdc 0 1 W s...
Page 18: ...www fanox com Rev 06 18 99 Dimensions...
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