2 Functions
213
SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015
the maximum expected operational phase-to-ground voltage, but less than the
minimum expected operational phase-to-phase voltage. For V
Nom
= 100 V, approxi-
mately 75 V is a typical setting. These settings have no significance in a grounded
system.
Displacement
Voltage V
0
Displacement voltage
64-1 VGND
(address
3108
or
3109
) or
64-1 VGND
(address
3110
) is used to pick up ground fault detection. At the same time, pickup of the voltage
element is a condition for initiation of directional determination. Depending on the
setting at address
213
VT Connect. 3ph
, only the applicable threshold address
3108
64-1 VGND
,
3109
64-1 VGND
or
3110
64-1 VGND
is accessible:
That is, if two phase-to-phase voltages and the displacement voltage V
0
are supplied
to the device, the measured displacement voltage is used directly for ground fault rec-
ognition. The threshold for V
0
is set at address
3108
(7SJ62/63) or
3109
(7SJ64),
where a more sensitive setting can be made than with a calculated displacement volt-
age. The upper setting threshold for 7SJ64 is higher than for 7SJ62/63 (see Technical
Data). Please note that with phase-to-phase voltage V
0
, the factor (in normal case =
1.73; see also Section 2.1.3.2) specified with parameter
206
Vph / Vdelta
is used.
For display of parameter
3108
64-1 VGND
or
3109
64-1 VGND
in primary values,
the following conversion formula applies:
If three phase-to-ground voltages are connected to the device, the displacement
voltage 3 · V
0
is calculated from the momentary values of phase-to-ground voltages,
and address
3110
is where the threshold is to be set. For the display of the parame-
ters
3110
in primary values, the following applies:
If secondary values of (for example) parameter
3109
and
3110
are set the same, their
primary values differ by the adaptation factor
Vph / Vdelta
.
Example:
Parameter 202
Vnom PRIMARY
= 12 kV
Parameter 203
Vnom SECONDARY
= 100 V
Parameter 206
Vph / Vdelta
= 1.73
Parameter 213
VT Connect. 3ph
= Vab, Vbc, VGnd
Parameter 3109
64-1 VGND
= 40 V
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 ...