Advertisement
From OVN1 to OVN4 logics
OVN1-OPT-TRIP
OVN2-OPT-TRIP
OVN3-OPT-TRIP
OVN4-OPT-TRIP
OVN1-OPT-ALARM
OVN2-OPT- ALARM
OVN3-OPT- ALARM
OVN4-OPT- ALARM
OVN1-OPT
OVN2-OPT
OVN3-OPT
OVN4-OPT
Figure 2.18-5 Grouping logic for TRC/Recording
Application
2.18.6
Negative sequence voltage is used to detect unbalance in the system, such as three-phase motor.
When a loss of phase occurs, the motor results in the state of voltage unbalance. The voltage
unbalance produces negative sequence currents; the appearance of the negative sequence
brings the influence of its raising temperature on the motor. Another influence of the negative
sequence produces magnetic flux in air gap of the motor, and makes the motor to rotate in the
opposite direction. Thereby, the OVN is used to prevent its damage, and the feature of the OVN
detects the negative sequence.
≥1
≥1
- 200 -
6F2T0207 (0.01)
To TRC
OVN-OPT-TRIP
OVN-OPT-ALARM
OVN-ARC-BLOCK
To Recording
OVN1-OPT
OVN2-OPT
OVN3-OPT
OVN4-OPT
GRE200 (5,6)
Advertisement
