Parameter Value
Description
NPS
This method should be used for most applications.
ZPS
This method can be used to suit older customer speci-
fications which specify this method but NPS is
preferred.
Parameter:
Gn 60VTS V
•
Default setting:
7 V
This setting is the threshold for negative or zero sequence unbalance voltage that is used to detect that a
voltage supply is not present.
Parameter:
Gn 60VTS I
•
Default setting: 0.1 x I
n
(0.1 ⋅ I
rated
)
This setting is the threshold for negative or zero sequence unbalance current that is used to detect that a
system fault may be present and therefore the presence of sequence voltage may not indicate a fuse
failure.
Parameter: Gn 60VTS V
PPS
•
Default setting:
15 V
If the balanced positive phase sequence voltage is below this threshold the 60VTS element can detect a 3
phase voltage failure depending on assessment of current level. If the balanced positive phase sequence
voltage is above this threshold, 60VTS will reset for 1, 2 or 3 phase operation.
Parameter: Gn 60VTS I
PPS
Load
•
Default setting: 0.1 x I
n
(0.1 ⋅ I
rated
)
If the balanced positive phase sequence current is below this threshold the 60VTS element will not detect
a 3 phase VF failure.
Parameter: Gn 60VTS I
PPS
Fault
•
Default setting: 10 x I
n
(10 ⋅ I
rated
)
If the balanced positive phase sequence current is above this threshold it is assumed that a fault is
present and the 60VTS element will not detect a 3 phase VF failure.
Parameter:
Gn 60VTS Delay
•
Default setting:
10 s
This is the delay applied to the 60VTS operate output. Protection element blocking for VT failure is instan-
taneous but a delay is applied to the 60VTS indication output to prevent nuisance indications.
If the conditions persist for a time greater than
60VTS Delay
an alarm output signal is raised for use as
indication. If normal current levels resume before the time delay expires the VTS condition is reset but if
the time delay has elapsed with VTS conditions met, the alarm output is raised and the VTS status is
latched and will not reset for reset of current conditions. Reset of voltage conditions at any time will reset
the VTS function element.
Supervision Functions
6.3 60VTS VT Supervision
Reyrolle 7SR5, Transformer Protection Device, Device Manual
353
C53000-G7040-C015-1, Edition 11.2019
