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6.11. Switch on to fault characteristic (SOTF).
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
volt
age, 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.
Содержание SIA-B
Страница 9: ...www fanox com Rev 32 9 114 The dimensions are in mm Cut out pattern ...
Страница 11: ...www fanox com Rev 32 11 114 Cut out pattern 2 3 Striker dimensions 2 3 1 PRT 15 ...
Страница 12: ...www fanox com Rev 32 12 114 2 3 2 PRT A 44 5 B 49 5 C 56 5 D 64 5 E 42 5 ...
Страница 19: ...www fanox com Rev 32 19 114 3 3 Functional Diagram ...
Страница 24: ...www fanox com Rev 32 24 114 Dimensions ...
Страница 27: ...www fanox com Rev 32 27 114 Dimensions Model CT16 5 Model CT08 5 ...
Страница 42: ...www fanox com Rev 32 42 114 ...
Страница 43: ...www fanox com Rev 32 43 114 ...
Страница 44: ...www fanox com Rev 32 44 114 ...
Страница 45: ...www fanox com Rev 32 45 114 ...
Страница 47: ...www fanox com Rev 32 47 114 ...
Страница 48: ...www fanox com Rev 32 48 114 ...
Страница 49: ...www fanox com Rev 32 49 114 ...
Страница 101: ...www fanox com Rev 32 101 114 Trip Voltage Level 17 Vdc C Nominal current 8 C CT type CT008 ...
Страница 113: ...www fanox com Rev 32 113 114 NOTES ...
Страница 114: ...www fanox com Rev 32 114 114 ...
