Overview
The “Compensated overvoltage” function provides protection against an overvoltage due to the opening of the remote terminal of a transmission line—the so called the Ferranti effect. This can be achieved using a transfer-tripping scheme.
For more detailed information on “Compensated overvoltage” element, refer to GE, Universal Relay (UR) family of products, Version 8.0x manuals.
To see other supported elements, click here.
Setting Parameters
Modbus memory map for Setting parameters
| Products | Hex address | Register name | Range | Units | Step | Format | Default |
| D60, L60, L90x | 23B5 | Compensated OV Function | 0 to 1 | — | 1 | F102 | 0 (Disabled) |
| " | 23B6 | Compensated OV Source | 0 to 5 | — | 1 | F167 | 0 (SRC 1) |
| " | 23B7 | Compensated OV Zc Mag | 0 to 500 | ohm | 0.01 | F001 | 200 |
| " | 23B8 | Compensated OV Zc Ang | 30 to 90 | degrees | 1 | F001 | 90 |
| " | 23B9 | Compensated OV I_1max | 0.01 to 1 | pu | 0.01 | F001 | 20 |
| " | 23BA | Compensated OV STG1 PKP | 0.25 to 3 | pu | 0.001 | F001 | 1300 |
| " | 23BB | Compensated OV STG1 Delay | 0 to 600 | sec | 0.01 | F001 | 100 |
| " | 23BC | Compensated OV STG2 PKP | 0.25 to 3 | pu | 0.001 | F001 | 1300 |
| " | 23BD | Compensated OV STG2 Delay | 0 to 600 | sec | 0.01 | F001 | 100 |
| " | 23BE | Compensated OV SGT3 PKP | 0.25 to 3 | pu | 0.001 | F001 | 1300 |
| " | 23BF | Compensated OV STG3 Delay | 0 to 600 | sec | 0.01 | F001 | 100 |
| " | 23C0 | Compensated OV Block | 0 to 4294967295 | — | 1 | F300 | 0 |
| " | 23C2 | Compensated OV Target | 0 to 2 | — | 1 | F109 | 0 (Self-reset) |
| " | 23C3 | Compensated OV Events | 0 to 1 | — | 1 | F102 | 0 (Disabled) |
| F102 | 0 = Disabled, 1 = Enabled | ||||||
| F109 | 0 = Self-reset, 1 = Latched, 2 = Disabled | ||||||
| F167 | 0 = SRC 1, 1 = SRC 2, 2 = SRC 3, 3 = SRC 4, 4 = SRC 5, 5 = SRC 6 | ||||||
Logics & highlights
Phasor diagram for a transmission line with remote terminal open
Calculation
Compensated overvoltage logic
