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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].
Figure 4.5-1 Characteristics of OVr1 and OVi1
Undervoltage-relay elements (UVr1, UVi1)
(ii)
Two undervoltage-relay elements (UVr1 and UVi1) are provided to determine the absence of
voltage on the running and incoming lines. In Figure 4.5-2 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].
Figure 4.5-2 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).
V r † , V i ‡
0
Pickup Voltage
V r † , V i ‡
0
Drop-off Voltage
- 597 -
6F2T0207 (0.01)
V
V
GRE200 (5,6)
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