Toshiba GR 200 Series, Instruction Manual

Page: 278 / 1563

6F2S1915 (0.46)
GRZ200 (Soft 031 & 032)
- 257 -
2.14.4
Miscellaneous functions
(i)
OVG operation blocked by the occurrence of VT failure
Blocking the OVG function may be required when a failure in the voltage transformer occurs.
The user shall set
Block
for scheme switch [
OVG1-VTFBlk
].
Non
(as a default) is set for scheme
switch [
OVG1-VTFBlk
] in order that the OVG function is not blocked by the failure.
(ii)
Switch of OVG trip command
The OVG function issues a trip command for the TRC† when
Trip
is set for scheme switch
[
OVG1-UseFor
] as the normal trip operation. However, when an alarm signal in place of the
trip command is required, the user can set
Alarm
for the scheme switch [
OVG1-UseFor
].
†Note: For more information of the trip circuit, see Chapter
Relay application: Trip
circuit.
(iii)
Execution of OVG function
Set
On
for scheme switch [
OVG1-EN
]. Otherwise, set
Off
for the scheme switch [
OVG1-EN
] if
the OVG1 element is not required to operate.
2.14.5
Scheme logic
Figure 2.14-4 shows the OVG function logic. Signal connection points “OVG*_BLOCK” are
provided for the block of the operation of the OV elements. For testing, the OVG1-PU element
is provided; it generates a pick-up signal when the entering voltage is excesses of the threshold
anytime. Thereby, in the IDMT characteristic, using both monitoring points “8000011C23” and
“8000011C27” can facilitate to measure the pickup time after the excess.