2.12 Ground Fault Protection 64, 67N(s), 50N(s), 51N(s)
210
SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015
50Ns–2 Element
(Definite Time)
Similar to the time overcurrent protection function the high set element is named
50Ns-2 PICKUP
(address
3113
). It is delayed with
50Ns-2 DELAY
(address
3114
)
and may be set to generate a message or to trip. The latter is only possible if address
3101
Sens. Gnd Fault
is set to
ON
.
50Ns–1 Element
(Definite Time)
The definite tripping characteristic 50Ns-1 is set with addresses
3117
and
3118
(ad-
dress
131
Sens. Gnd Fault
=
Definite Time
).
Pickup Stabilization
(Definite Time)
Pickup of the definite time elements can be stabilized by means of a configurable
dropout time. This dropout time is set in
3121
50Ns T DROP-OUT
.
51Ns Element (In-
verse Time)
The inverse tripping characteristic 51N-TOC is set with addresses
3119
and
3120
(address
131
Sens. Gnd Fault
=
User Defined PU
).
Logarithmic
Inverse
characteristic (In-
verse Time)
The logarithmic inverse characteristic (see Figure 2-75) is set in parameters
3119
51Ns PICKUP
,
3141
51Ns Tmax
,
3140
51Ns Tmin
,
3142
51Ns TIME DIAL
and
3143
51Ns Startpoint
.
51Ns Tmin
and
51Ns Tmax
define the tripping time
range. The slope of the curve is defined in
3142
51Ns TIME DIAL
.
51Ns PICKUP
is the reference value for all current values with
51Ns Startpoint
representing the
beginning of the curve, i.e. the lower operating range on the current axis (related to
51Ns PICKUP
). This factor is preset to the value 1.1, analogous to the other inverse
time curves. This factor can also be set to 1.0 since in logarithmic inverse curves the
tripping time on a current value, which is identical to the specified pickup threshold,
does not go towards infinity, but has a finite time value.
Figure 2-75
Trip-time characteristics of the inverse-time ground fault protection 51Ns with
logarithmic inverse characteristic
Logarithmic inverse
t = 51Ns MAX. TIME DIAL - 51Ns TIME DIAL·ln(
I
/
51Ns PICKUP
)
Note:
For
I
/
51Ns PICKUP
> 35 the time applies for
I
/
51Ns PICKUP
= 35
Содержание siprotec SJ62
Страница 3: ...3 SIPROTEC 4 7SJ62 63 64 Handbuch C53000 G1140 C147 A Edition 07 2015 ...
Страница 9: ...Preface 9 SIPROTEC 4 7SJ62 63 64 Handbuch C53000 G1140 C147 A Edition 07 2015 ...
Страница 21: ...Contents 19 SIPROTEC 4 7SJ62 63 64 Handbuch C53000 G1140 C147 A Edition 07 2015 ...
Страница 35: ...1 Introduction 33 SIPROTEC 4 7SJ62 63 64 Handbuch C53000 G1140 C147 A Edition 07 2015 ...
Страница 365: ...2 Functions 363 SIPROTEC 4 7SJ62 63 64 Handbuch C53000 G1140 C147 A Edition 07 2015 ...
Страница 443: ...3 Mounting and Commissioning 441 SIPROTEC 4 7SJ62 63 64 Handbuch C53000 G1140 C147 A Edition 07 2015 ...
Страница 529: ...4 Technical Data 527 SIPROTEC 4 7SJ62 63 64 Handbuch C53000 G1140 C147 A Edition 07 2015 ...
Страница 699: ...A Appendix 697 SIPROTEC 4 7SJ62 63 64 Handbuch C53000 G1140 C147 A Edition 07 2015 ...
Страница 701: ...Literature 699 SIPROTEC 4 7SJ62 63 64 Handbuch C53000 G1140 C147 A Edition 07 2015 ...
Страница 714: ...Index 712 SIPROTEC 4 7SJ62 63 64 Handbuch C53000 G1140 C147 A Edition 07 2015 ...
Страница 715: ...Index 713 SIPROTEC 4 7SJ62 63 64 Handbuch C53000 G1140 C147 A Edition 07 2015 ...