Overview
The “Neutral voltage unbalance” element responds to the voltage signal at the neutral point of the capacitor bank. The operating equations are properly compensated for both the system unbalance such as during close-in external faults, and the inherent bank unbalance.
For more detailed information on “Neutral voltage 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 | 655F | Neutral Voltage Unbalance 1 Function | 0 to 1 | — | 1 | F102 | 0 (Disabled) |
| " | 6560 | Neutral Voltage Unbalance 1 Neutral-Point Source | 0 to 5 | — | 1 | F167 | 0 (SRC 1) |
| " | 6561 | Neutral Voltage Unbalance 1 Bus Source | 0 to 5 | — | 1 | F167 | 0 (SRC 1) |
| " | 6562 | Neutral Voltage Unbalance 1 Bus 3V0 | 0 to 1 | — | 1 | F241 | 0 (Calculated) |
| " | 6563 | Neutral Voltage Unbalance 1 Ground | 0 to 1 | — | 1 | F255 | 0 (VT (ungrnd)) |
| " | 6564 | Neutral Voltage Unbalance 1 AB Ratio | 0.75 to 1.25 | — | 0.000 1 |
F001 | 10000 |
| " | 6565 | Neutral Voltage Unbalance 1 AC Ratio | 0.75 to 1.25 | — | 0.000 1 |
F001 | 10000 |
| " | 6566 | Neutral Voltage Unbalance 1 Stage 1 Pickup | 0.001 to 1 | pu | 0.001 | F001 | 10 |
| " | 6567 | Neutral Voltage Unbalance 1 Stage 1 Slope | 0 to 10 | % | 0.1 | F001 | 0 |
| " | 6568 | Neutral Voltage Unbalance 1 Stage 2 Pickup | 0.001 to 1 | pu | 0.001 | F001 | 20 |
| " | 6569 | Neutral Voltage Unbalance 1 Stage 2 Slope | 0 to 10 | % | 0.1 | F001 | 0 |
| " | 656A | Neutral Voltage Unbalance 1 Stage 3 Pickup | 0.001 to 1 | pu | 0.001 | F001 | 20 |
| " | 656B | Neutral Voltage Unbalance 1 Stage 3 Slope | 0 to 10 | % | 0.1 | F001 | 50 |
| " | 656C | Neutral Voltage Unbalance 1 Stage 4 Pickup | 0.001 to 1 | pu | 0.001 | F001 | 30 |
| " | 656D | Neutral Voltage Unbalance 1 Stage 4 Slope | 0 to 10 | % | 0.1 | F001 | 50 |
| " | 656E | Neutral Voltage Unbalance 1 Stage 1 Pickup Delay | 0 to 600 | s | 0.01 | F001 | 3000 |
| " | 656F | Neutral Voltage Unbalance 1 Stage 2 Pickup Delay | 0 to 600 | s | 0.01 | F001 | 1000 |
| " | 6570 | Neutral Voltage Unbalance 1 Stage 3 Pickup Delay | 0 to 600 | s | 0.01 | F001 | 100 |
| " | 6571 | Neutral Voltage Unbalance 1 Stage 4 Pickup Delay | 0 to 600 | s | 0.01 | F001 | 20 |
| " | 6572 | Neutral Voltage Unbalance 1 Dropout Delay | 0 to 600 | s | 0.01 | F001 | 25 |
| " | 6573 | Neutral Voltage Unbalance 1 Stage 1 Block | 0 to 4294967295 | — | 1 | F300 | 0 |
| " | 6575 | Neutral Voltage Unbalance 1 Stage 2 Block | 0 to 4294967295 | — | 1 | F300 | 0 |
| " | 6577 | Neutral Voltage Unbalance 1 Stage 3 Block | 0 to 4294967295 | — | 1 | F300 | 0 |
| " | 6579 | Neutral Voltage Unbalance 1 Stage 4 Block | 0 to 4294967295 | — | 1 | F300 | 0 |
| " | 657B | Neutral Voltage Unbalance 1 Target | 0 to 2 | — | 1 | F109 | 0 (Self-Reset) |
| " | 657C | Neutral Voltage Unbalance 1 Events | 0 to 1 | — | 1 | F102 | 0 (Disabled) |
| " | 657D | …Repeated for Neutral Voltage Unbalance 2 | |||||
| " | 659B | …Repeated for Neutral Voltage 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 | ||||||
| F241 | 0 = Calculated, 1 = Measured | ||||||
| F255 | 0 = VT (ungrnd) = ungrounded, 1 = CTxR (grnd) = grounded | ||||||
Logics & highlights
Neutral voltage unbalance basic connection
Neutral voltage unbalance logic
