P12x/EN AP/A96
Application Guide
Page 10/80
MiCOM P120/P121/P122/P123
t
I
I>>
I>
t_I>
I> >> >>>Interlock NO
P0358ENa
I>
t
I>>
t
I>>>
t
I>
t
I>>
t
I>>>
t
t
I
I>>
I>
t_I>>
I> >> >>>Interlock YES
t_I>>>
I>>>
2.3
DMT thresholds
The three phase (earth) overcurrent thresholds can be selected with a time constant delay.
The time to operate is equal to the time delay set, plus the time for the output contact to
operate (typically about 20 to 30 ms ; 20ms for a current exceeding or equal to 2 times the
threshold) and the time required to detect the overcurrent state (maximum 20ms at 50Hz).
For DMT curves, a reset timer "t Reset" is associated with the first and second thresholds
(phase and earth elements).
2.4 IDMT
thresholds
2.4.1
Inverse time curves
The first and second phases (earth) overcurrent threshold can be selected with a dependent
time characteristic. The time delay is calculated with a mathematical formula.
There are eleven inverse time characteristics available.
The mathematical formula applicable to the first ten curves is:
t=T x (
K
(I/I
S
)
α
–1
+L )
Where:
t
= Tripping time
K
= Coefficient (see table)
I
= Value of measured current
I
S
= Value of the programmed threshold (Pick-up value)
α
= Coefficient (see table)
L
= ANSI/IEEE coefficient (zero for IEC curves)
T
= Time multiplier between 0.025 and 1.5
Содержание MiCom P120
Страница 1: ...MiCOM P120 P121 P122 P123 Overcurrent Relays Version 11 Technical Guide P12X EN T A96...
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Страница 13: ...Introduction P12x EN IT A96 MiCOM P120 P121 P122 P123 INTRODUCTION...
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Страница 515: ...Communications P12x EN CT A96 MiCOM P120 P121 P122 P123 IEC 60870 5 103 MiCOM P120 P121 P122 P123 VERSION V11 A...
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Страница 553: ...Commissioning and Maintenance P12x EN CM A96 MiCOM P120 P121 P122 P123 COMMISSIONING AND MAINTENANCE GUIDE...
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Страница 573: ...Connection Diagrams P12x EN CO A96 MiCOM P120 P121 P122 P123 CONNECTION DIAGRAMS...
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Страница 579: ...Commissioning Test Record Sheets P12x EN RS A96 MiCOM P120 P121 P122 P123 COMMISSIONING TEST RECORD SHEETS...
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