Overview
The “Neutral current unbalance” element responds to a differential current signal measured as a vectorial current difference between neutral currents of parallel banks. In case of ungrounded banks, regular, preferably low-ratio CT can be used. In case of grounded banks, a window or core-balance CT shall be used for increased accuracy/sensitivity.
For more detailed information on “Neutral current unbalance” 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 |
| C70 | 650E | Neutral Current Unbalance 1 Function | 0 to 1 | — | 1 | F102 | 0 (Disabled) |
| " | 650F | Neutral Current Unbalance 1 Bank Source | 0 to 5 | — | 1 | F167 | 0 (SRC 1) |
| " | 6510 | Neutral Current Unbalance 1 k Magnitude | 0 to 0.15 | — | 0.000 1 |
F001 | 0 |
| " | 6511 | Neutral Current Unbalance 1 k Angle | 0 to 359 | ° | 1 | F001 | 0 |
| " | 6512 | Neutral Current Unbalance 1 Stage 1 Pickup | 0 to 5 | pu | 0.001 | F001 | 20 |
| " | 6513 | Neutral Current Unbalance 1 Stage 1 Slope | 0 to 10 | % | 0.1 | F001 | 20 |
| " | 6514 | Neutral Current Unbalance 1 Stage 2 Pickup | 0 to 5 | pu | 0.001 | F001 | 30 |
| " | 6515 | Neutral Current Unbalance 1 Stage 2 Slope | 0 to 10 | % | 0.1 | F001 | 20 |
| " | 6516 | Neutral Current Unbalance 1 Stage 3 Pickup | 0 to 5 | pu | 0.001 | F001 | 40 |
| " | 6517 | Neutral Current Unbalance 1 Stage 3 Slope | 0 to 10 | % | 0.1 | F001 | 20 |
| " | 6518 | Neutral Current Unbalance 1 Stage 4 Pickup | 0 to 5 | pu | 0.001 | F001 | 50 |
| " | 6519 | Neutral Current Unbalance 1 Stage 4 Slope | 0 to 10 | % | 0.1 | F001 | 50 |
| " | 651A | Neutral Current Unbalance 1 Stage 1 Pickup Delay | 0 to 600 | s | 0.01 | F001 | 3000 |
| " | 651B | Neutral Current Unbalance 1 Stage 2 Pickup Delay | 0 to 600 | s | 0.01 | F001 | 1000 |
| " | 651C | Neutral Current Unbalance 1 Stage 3 Pickup Delay | 0 to 600 | s | 0.01 | F001 | 100 |
| " | 651D | Neutral Current Unbalance 1 Stage 4 Pickup Delay | 0 to 600 | s | 0.01 | F001 | 20 |
| " | 651E | Neutral Current Unbalance 1 Dropout Delay | 0 to 600 | s | 0.01 | F001 | 25 |
| " | 651F | Neutral Current Unbalance 1 Stage 1 Block | 0 to 4294967295 | — | 1 | F300 | 0 |
| " | 6521 | Neutral Current Unbalance 1 Stage 2 Block | 0 to 4294967295 | — | 1 | F300 | 0 |
| " | 6523 | Neutral Current Unbalance 1 Stage 3 Block | 0 to 4294967295 | — | 1 | F300 | 0 |
| " | 6525 | Neutral Current Unbalance 1 Stage 4 Block | 0 to 4294967295 | — | 1 | F300 | 0 |
| " | 6527 | Neutral Current Unbalance 1 Target | 0 to 2 | — | 1 | F109 | 0 (Self-Reset) |
| " | 6528 | Neutral Current Unbalance 1 Events | 0 to 1 | — | 1 | F102 | 0 (Disabled) |
| " | 6529 | …Repeated for Neutral Current Unbalance 2 | |||||
| " | 6544 | …Repeated for Neutral Current Unbalance 3 |
| 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
Neutral current unbalance connections
Neutral current unbalance logic
