66 6LE008146B
Advanced protection functions
5.3 Overvoltage protection (OV-59)
The overvoltage protection (OV-59), ANSI 59 permanently monitors the installation voltage.
When the voltage exceeds acceptable limits, either the circuit breaker trips and a trip alarm
is generated, or only an advanced protection alarm is generated. In addition, continuous
monitoring of phase-phase or phase-neutral voltages allows the appropriate action to be
performed to secure the electrical installation such as load-shedding, switch of power source,
start of a backup generator.
Operating principle
These overvoltage protections allow the three phase-phase voltages to be monitored or the
three phase-neutral voltages.
It launches at the end of the activation time delay when one of the three voltages reaches the
activation threshold.
Vmax
tVmax
Adjustment parameters
OV-59
ANSI 59
Config.
Configuration of the protection
Inhibit Inhibition of the protection
Type U/ V
Choice of the voltage to monitor: L-L = phase-phase voltage, L-N =
phase-neutral voltage
Threshold Activation threshold Vmax
Time Activation time delay tVmax
Configuration
The parameter configuration defines the protection behaviour when the activation threshold
and the time delay are reached.
Trip Circuit breaker tripping
Alarm Alarm without tripping the circuit breaker
O Protection deactivated (default setting)
Inhibition
This parameter allows the protection action to be inhibited temporarily based on a command
sent in one of the following ways:
- sentinel Energy display from the MODE menu
- Hager Power setup software (Commands menu)
- Digital input (DI): assignment of the digital input to the inhibition required
- Modbus communication.
On The protection is inhibited while the inhibition command is at On
O The protection is fully operational while the inhibition command is at O
Vmax: activation threshold of the overvoltage
protection
tVmax: activation time delay of the overvoltage
protection
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