Toshiba GR200 Series - (ii) UVS trip signal; (iii) Operation of UVS function; (iv) Under voltage test; 2.25.4 Scheme logic

6F2S1914 (0.49)
GRL200 (Soft 033 & 037)
- 335 -
(ii) UVS trip signal
The UVS1 element issues a trip signal for the trip circuit (TRC†) when Trip is set for scheme
switch [UVS1-UseFor] as the normal tripping. However, when an alarm signal in place of the
trip signal is required, the user can set Alarm for the scheme switch [UVS1-UseFor].
†Note: For more information about tripping, see Chapter Relay application: Trip circuit .
(iii) Operation of UVS function
Set On for scheme switch [UVS1-EN]. Otherwise, set Off for the scheme switch [UVS1-EN] if
the UVS1 element is not required to operate.
(iv) Under voltage test
Setting [UVS-Test] =On is not to operate UVS blocking element (UVSBLK) for testing.
2.25.4 Scheme logic
Figure 2.25-4 show the logic of the UVS function. PLC connection points “UVS*_BLOCK” are
provided for blocking the operation of the UVS elements. Other PLC connection points
“CB_*PH_OPEN” are provided so that the UVS function can determine its operation using the
open/closed information of a circuit breaker (CB). For testing, the UVS1-PU element is
provided; it generates a pick-up signal when the entering voltage is below the threshold
anytime. For example, in the IDMT characteristic, using both PLC monitoring points
“8000011B20” and “8000011B24” can facilitate to measure the pickup time after the deficiency.