Overview
The “100% stator ground” element responds to third harmonic voltage measured at the generator neutral and output terminals. When used in conjunction with the neutral overvoltage (fundamental frequency) element, it provides 100% ground fault protection of the stator windings.
For more detailed information on “100% stator ground” 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
Stator Ground Source element
| Products | Hex address | Register name | Range | Units | Step | Format | Default |
| G30, G60 | 41A2 | Stator Ground Source | 0 to 5 | — | 1 | F167 | 0 (SRC 1) |
| F167 | 0 = SRC 1, 1 = SRC 2, 2 = SRC 3, 3 = SRC 4, 4 = SRC 5, 5 = SRC 6 | ||||||
100% stator ground function
| Products | Hex address | Register name | Range | Units | Step | Format | Default |
| G30, G60 | 41B1 | Stator Ground Function | 0 to 1 | — | 1 | F102 | 0 (Disabled) |
| " | 41B2 | Stator Ground Stage 1 Pickup | 0 to 0.9 | pu | 0.001 | F001 | 150 |
| " | 41B3 | Stator Ground Stage 1 Pickup Delay | 0 to 600 | s | 0.01 | F001 | 100 |
| " | 41B4 | Stator Ground Stage 1 Supv | 0.001 to 0.1 | pu | 0.000 1 |
F001 | 57 |
| " | 41B5 | Stator Ground Stage 2 Pickup | 0 to 0.9 | pu | 0.001 | F001 | 150 |
| " | 41B6 | Stator Ground Stage 2 Pickup Delay | 0 to 600 | s | 0.01 | F001 | 0 |
| " | 41B7 | Stator Ground Stage 2 Supv | 0.001 to 0.1 | pu | 0.000 1 |
F001 | 45 |
| " | 41B8 | Stator Ground Block | 0 to 4294967295 | — | 1 | F300 | 0 |
| " | 41BA | Stator Ground Target | 0 to 2 | — | 1 | F109 | 0 (Self-reset) |
| " | 41BB | Stator Ground Event | 0 to 1 | — | 1 | F102 | 0 (Disabled) |
| " | 41BC | Reserved (5 items) | 0 to 65535 | — | 1 | F001 | 0 |
| F102 | 0 = Disabled, 1 = Enabled | ||||||
| F109 | 0 = Self-reset, 1 = Latched, 2 = Disabled | ||||||
Logics & highlights
Definition
Example 1: 100% stator ground application example
Example 2
Stator ground logic
