Toshiba GR 200 Series, Instruction Manual

Page: 697 / 1563

6F2S1915 (0.46)
GRZ200 (Soft 031 & 032)
- 676 -
operating area of OV characteristic. The OVr1 element is used to check for the presence of
voltage on the running-line; similarly, the OVi1 element is used to check for the presence of
voltage on the incoming-line. The user can set pick-up thresholds using the settings [
OVR1
]
and [
OVI1
].
V
Vr†, Vi‡
Pickup Voltage
0
Figure 4.6-1 Characteristics of OVr1 and OVi1
(ii)
Undervoltage-relay elements (UVr1, UVi1)
Two undervoltage-relay elements (UVr1 and UVi1) are provided to determine the absence of
voltage on the running and incoming lines. In Figure 4.6-2 the hatched area depicts the
operating area of the UV characteristic. The UVr1 element is used to check for the absence of
voltage on the running-line; similarly, the UVi1 element is used to check for the absence of
voltage on the incoming-line. The user can set drop-off thresholds using the settings [
UVR1
]
and [
UVI1
].
V
Vr†, Vi‡
Drop-off Voltage
0
Figure 4.6-2 Characteristics of UVr1 and UVi1
†
Note: Settings [
OVR1
] and [
UVR1
] are applied for the measurement of voltage on the
running line (Vr).
‡
Note: Settings [
OVI1
] and [
UVI1
] are applied for the measurement of voltage on the
incoming line (Vi).