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27/59 - Voltage Relay
Model Overview
27 Undervoltage Relay
The undervoltage element picks up whenever the line or phase voltage drops below the selected settings. A timer is normally used to enable it to ride through momentary sags and thus prevent nuisance tripping.
The five-level undervoltage relay characteristic is presented in Figure 1.
For instance, if level 1 voltage is 0.8 pu and tripping time is 1 sec. It means that when the input voltage is lower than 0.8 pu and continues to be lower than 0.8 pu for more than 1 second, the undervoltage relay will be asserted. If the voltage is lower than 0.8 pu for less than 1 second, its timer will reset and will not restart until the voltage amplitude violates the level 1 voltage threshold again. All voltage levels and delay times are tunable parameters.
59 Overvoltage Relay
The overvoltage element trips electrical equipment under its protection whenever the line or phase 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 overvoltage relay characteristics is presented in Figure 2.
For instance, if 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 overvoltage 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 violates the level 1 voltage threshold again. All voltage levels and delay times are tunable parameters.
Figure 1 Undervoltage relay characteristic
Figure 2 Overvoltage relay characteristic
Mask and Parameters
General parameters
Name | Unit | Description |
---|---|---|
Enable | - | Enable and disable relay operation |
Frequency | Hz | The frequency of the measured current signals. Both 50 and 60 Hz are supported within the model. |
Base Voltage (L-L) | V | The base voltage (L-L) at the measurement location |
Operating Quantity | N/A | Two types of operating quantity are provided in this model: Phase-Neutral Voltage or Phase-Phase Voltage among three phases. |
Sample Time | s | Model time step |
27 Undervoltage
Name | Unit | Description |
---|---|---|
Enable 27UV | - | Enable and disable for 27UV element |
27UV Level 1 | pu | Undervoltage level 1. |
27UV Level 2 | pu | Undervoltage level 2. |
27UV Level 3 | pu | Undervoltage level 3. |
27UV Level 4 | pu | Undervoltage level 4. |
27UV Level 5 | pu | Undervoltage level 5. |
Time for 27UV Level 1 | s | Time delay associated with 27UV Level 1. |
Time for 27UV Level 2 | s | Time delay associated with 27UV Level 2. |
Time for 27UV Level 3 | s | Time delay associated with 27UV Level 3. |
Time for 27UV Level 4 | s | Time delay associated with 27UV Level 4. |
Time for 27UV Level 5 | s | Time delay associated with 27UV Level 5. |
59 Overvoltage
Name | Unit | Description |
---|---|---|
Enable 59OV | - | Enable and disable for 59OV element |
59OV Level 1 | pu | Overvoltage level 1. |
59OV Level 2 | pu | Overvoltage level 2. |
59OV Level 3 | pu | Overvoltage level 3. |
59OV Level 4 | pu | Overvoltage level 4. |
59OV Level 5 | pu | Overvoltage level 5. |
Time for 59OV Level 1 | s | Time delay associated with 59OV Level 1. |
Time for 59OV Level 2 | s | Time delay associated with 59OV Level 2. |
Time for 59OV Level 3 | s | Time delay associated with 59OV Level 3. |
Time for 59OV Level 4 | s | Time delay associated with 59OV Level 4. |
Time for 59OV Level 5 | s | Time delay associated with 59OV Level 5. |
Inputs and Outputs
Inputs
Name | Description |
---|---|
Vabc | A 3-dimension voltage input for three-phase voltages, in the order of Va, Vb and Vc. |
Reset | The reset signal for the relay. The relay will be reset when this signal becomes 1. |
Outputs
Name | Description |
---|---|
Trip | The output of the relay. By default, it is 0, if an overvoltage/undervoltage scenario is detected, it becomes 1. |
Available monitoring signals
Name | Description |
---|---|
Trip_59 | Trip output of the 59OV element. |
Trip_27 | Trip output of the 27UV element. |
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