Siemens 7SG164 Ohmega 400 Series Manual page 140

Voltage Transformer Supervision
Title Voltage Transformer Supervision, version 2
Art No 2615S81153 R5
Author Ken Nickerson
Generate the latch reset from the voltage recovery
ALL_ISOLATED
VTSOV
VTS3PLOV
Perform 3 pole loss of voltage check - gives alarm out only.
Now the actual VTS logic
ALL_ISOLATED
VTSOV
&
VTSUC
VTS_LATCH
VTSLATCHENABLE
VTS_ACTIVE
VTSMODE
VTSPFMODE
©2011 Siemens Protection Devices Limited
1
1
&
VTSAlarmDelay
100 / 20
VTSLatchTimer
5000 / 1
RESET_VTS_LATCH
7SG1641 Ohmega 402 60 Diagrams
1
VTSLatch
S
R
VTSResetDelay
&
0 / 20
RESET_VTS_LATCH
LOST3PVOLTS
VTS_ACTIVE
VTSA
Q VTS_LATCH
VTSEFI
& VTSPFI
Chapter 11 Page 11 of 18