Rev.23
43/311
4.12. Function 81O/U. Overfrequency and underfrecuency protection
There are four protection units of the variation in frequency. Each one of them has an adjustment which
determines whether the unit acts as overfrequency or underfrequency. The reaction time of the unit is
determined by the set operating time.
In case the unit acts like overfrequency, activation of the function occurs at 100% frequency level set
and is reset when the measured frequency is 50 mHz lower than set start level.
If the unit is set as underfrequency, activation of the function occurs at 100% frequency level set and is
reset when the measured frequency is 50 mHz higher than set start level.
The reset is temporized and the reset time is determined by the reset time setting.
Accuracy of operating time and reset time is adjusted time plus a maximum of 30ms.
The frequency measurement is done from the voltage of phase B. It takes a minimum of 30 volts at this
stage for 81 functions to be operational. If the measured phase voltage is less than 30 volts, it activates
a state bit indicating function blocked. When the frequency measurement is again valid, function begins
in the start state with all bits and counters reset.
This protection function is adjusted by setting five different parameters:
Function
Description
Minimum
Maximum
Step
Unit
Default
81_1
81_2
81_3
81_4
Overfrequency or Underfrequency
Permission
-
-
Yes/No
-
No
Type
-
-
(1*)
-
Underfrequency
Activation level
45.00
65.00
0.01
Hz
55
Operating time
0.06
300.00
0.01
s
100
Reset time
0.2
1200.0
0,1
s
0.2
(1*) Overfrequency or Underfrequency
Содержание SIL B
Страница 1: ...EN_FANOXTD_MANU_SIL_Feeder_SILB_R023 Docx USER S MANUAL SIL B Feeder Relay...
Страница 8: ...www fanox com Rev 23 8 311 2 DIMENSIONS AND CONNECTION DIAGRAMS 2 1 Equipment front view...
Страница 9: ...www fanox com Rev 23 9 311 2 2 Equipment dimensions...
Страница 10: ...www fanox com Rev 23 10 311...
Страница 11: ...www fanox com Rev 23 11 311 2 3 Cut out pattern CUT OUT PATTERN...
Страница 12: ...www fanox com Rev 23 12 311 2 4 Connection diagrams Analog connections...
Страница 13: ...www fanox com Rev 23 13 311...
Страница 14: ...www fanox com Rev 23 14 311 Digital connections Outputs and Trip circuit supervision...
Страница 15: ...www fanox com Rev 23 15 311 2 5 Terminals IEC 61850 or DNP3 0 protocols...
Страница 17: ...www fanox com Rev 23 17 311 IEC 60870 5 103 protocol...
Страница 25: ...www fanox com Rev 23 25 311 3 3 Functional diagram...
Страница 28: ...www fanox com Rev 23 28 311 3 5 1 SIL B 1 CHARGE CURVE 3 5 2 SIL B 5 CHARGE CURVE...
Страница 38: ...www fanox com Rev 23 38 311 4 6 4 Thermal protection curves This is the thermal curve for 3 minutes...
Страница 91: ...www fanox com Rev 23 91 311...
Страница 140: ...www fanox com Rev 23 140 311...
Страница 194: ...www fanox com Rev 23 194 311 Polarization V 35 0 V C Operating Angle 180 C Halfcone Angle 3 C...
Страница 307: ...www fanox com Rev 23 307 311 50BF init Fault init 79 Closure permission 52 closure permission...
Страница 308: ...www fanox com Rev 23 308 311 12 8 LED s configuration LEDs Blinking Latch Negate d LED On LED 1 LED 2 LED 3 LED 4 LED 5...
Страница 310: ...www fanox com Rev 23 310 311 NOTES...
Страница 311: ...www fanox com Rev 23 311 311...