Overview
The “Stator differential protection” element is intended for use on the stator windings of rotating machinery. This element has a dual slope characteristic. The main purpose of the percent-slope characteristic is to prevent a maloperation caused by unbalances between CTs during external faults.
For more detailed information on “Stator differential protection” 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 |
| G60, M60 | 49CC | Stator Differential Function | 0 to 1 | — | 1 | F102 | 0 (Disabled) |
| " | 49CD | Stator Differential Pickup | 0.05 to 1 | pu | 0.001 | F001 | 100 |
| " | 49CE | Stator Differential Slope 1 | 1 to 100 | % | 1 | F001 | 10 |
| " | 49CF | Stator Differential Slope 2 | 1 to 100 | % | 1 | F001 | 80 |
| " | 49EA | Stator Differential Break 1 | 1 to 1.5 | pu | 0.01 | F001 | 115 |
| " | 49EB | Stator Differential Break 2 | 1.5 to 30 | pu | 0.01 | F001 | 800 |
| " | 49EC | Stator Differential Block | 0 to 4294967295 | — | 1 | F300 | 0 |
| " | 49EE | Stator Differential Targets | 0 to 2 | — | 1 | F109 | 0 (Self-reset) |
| " | 49EF | Stator Differential Events | 0 to 1 | — | 1 | F102 | 0 (Disabled) |
| " | 49F0 | Stator Differential Line End Source | 0 to 5 | — | 1 | F167 | 0 (SRC 1) |
| " | 49F1 | Stator Differential Neutral End Source | 0 to 5 | — | 1 | F167 | 0 (SRC 1) |
| 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
Stator differential characteristic
Stator differential logic
Saturation detection state machine
Phase comparison principle
Stator differential final output logic
