Toshiba GR200 Series Instruction Manual page 499

Supervision of voltage in zero-sequence (V0 error)
9.2.17
Zero-sequence voltage is automatically calculated using three-phase voltages measured in the
relay. If Equation (9.2-3) is made up, the supervision function can determine that a voltage in
zero-sequence is being applied erroneously.
1.
Error level
(i)
The default error level is set at level 3 (Minor error), but the user can program the level using
setting [CHK_VZ:LVl]; then, set On for the setting [CHK_VZ:Sw]. The time for the detection
can be set using [CHK_VZ:Timer] , which is set for 15 seconds as default. After the error is
cleared, it is reset in the time that is the same as the setting time to the detection.
Error message
(ii)
When detecting an error, an error message can be shown on the LCD screen and an LED is lit.
Table 9.2-34 Error messages provided by the supervisor in CHK_VZ_CBP
Message and level
V0 error
Error level
Table 9.2-35 Detailed information in Hexadecimal in CHK_VZ_CBP
Display
area
10000000:
01000000:
00100000:
Top row
00010000:
00001000:
00000100:
Middle row (No information displayed)
(No information displayed)
Bottom row
| V |
+ V + V
a b c
≥ 6.35 (V)
3
Meaning of the information
Detection of the zero-sequence voltage
Minor error (Level 3)
Meaning of the detailed information
Left column
ZoneA
ZoneB
ZoneC
ZoneD
ZoneE
ZoneF
- 485 -
Right column
00000001: ORed state in all zones
(No information displayed)
(No information displayed)
Centralized GRB200
(Soft: 030, 031, 032, 033, 034)
6F2S1931 (0.20)
(9.2-3)