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59 - Overvoltage Relay (1-ph)


The over-voltage relay (59-OV) operates when the voltage it monitors exceeds a set of threshold values. There are five levels of settings available in this relay. Each level corresponds
to a predefined over-voltage level and a tripping delay time. The operating quantity of the relay can be the RMS value of phase voltage, or the positive, negative or zero sequence of a three-phase voltage signals. The operating quantity can be either in per unit or actual value. 

Icons and diagrams

Model overview

The over-voltage relay trips electrical equipment under its protection whenever the line voltage exceeds the selected setting. A time-delay is normally used to enable it to ride through momentary spikes and thus prevent nuisance tripping. The five-level over-voltage relay characteristics are presented below. For instance, if we use the default values as illustrated above, Level 1 voltage is 1.05 pu and tripping time is 2 sec. It means that when the input voltage is higher than 1.05 pu and continues to be higher than 1.05 pu for more than 2 seconds, the over-voltage relay will be asserted. If the voltage is higher than 1.05 pu for any time that is less than 2 seconds, its timer will be reset and will not restart until the voltage reaches the level 1 voltage threshold again. All voltage levels and delay times are tunable parameters.


The below figure shows the control panel of the 59-OV relay. 

The following parameters are tunable: 

Parameter tab of 59-OV Relay

NameUnitDescriptionSample value
Level 1 pu or VOvervoltage level 11.05
Level 2pu or VOvervoltage level 21.10
Level 3pu or VOvervoltage level 31.15
Level 4 pu or VOvervoltage level 41.20
Level 5pu or VOvervoltage level 51.25
Time 1secTime delay associated with level 12
Time 2secTime delay associated with level 20.5
Time 3secTime delay associated with level 30.4
Time 4 secTime delay associated with level 40.3
Time 5secTime delay associated with level 50.2

Input and output signals
The module has 1 input and 1 output:

59-OV Relay I/O

I/O NameType (Unit) Description

pu or V

A single dimensional signal,  it should be the RMS value of phase voltage, or the positive, negative or zero sequence of a three-phase voltage signals.


The output of overvoltage relay. By default it is 0, if an over-voltage scenario is detected, it becomes 1.

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