Specifications

February 2007
16-56
For more information visit: www.eaton.com CA08101001E
Transfer Switches
16
Transfer Switch Equipment
Appendix B — Transfer Switches — Inter-Tie Protective Relay
M-3410A Inter-Tie Protective Relay (Continued)
Refer to the appropriate table to make protective relaying changes.
Table 16-49. M-3410A Inter-Tie Protective Relay Set Points (Continued)

Of nominal voltage.

When DFT is selected, the time delay accuracy is ±2 cycles. When rms is selected, an additional time delay from 0 to +20 cycles may occur.

Instantaneous voltage magnitude response; intended for ferroresonance protection.

For fundamental (60 Hz/50 Hz) signal only. For distorted input signals, the accuracy degrades as the order of harmonic signal increases.

This range applies to 50 Hz nominal frequency models.

Maximum measured range for (25), (59), (59G), and (59I) function settings is ≤600 V.

When line-ground-to-line-line is selected, the relay internally calculates the line-line voltage from the line-ground voltages for all voltage-sensitive
functions. When the line-ground-to-line-line selection is applied, the nominal voltage selection should be the line-line nominal voltage (not line-ground
nominal voltage).
Device
Number
Function Set Point
Ranges
Increment Accuracy
Inverse Time Residual Overcurrent
51N Pickup 0.50 to 6.00 A
(0.10 to 1.20 A)
0.1 A ±0.1 A or ±3%
(±0.02 A or ±3%)
Characteristic Curves Definite Time/Inverse Time/Very Inverse/Extremely Inverse/IEC
Time Dial
Standard Curves #1 – #4
IEC Curves #1 – #4
0.5 to 11.0
0.05 to 1.10
0.1
0.01
±3 Cycles or ±10%
Inverse Time Overcurrent, with Voltage Control or Voltage Restraint
51V Pickup 0.50 to 12.00 A
(0.10 to 2.40 A)
0.01 A ±0.1 A or ±3%
(±0.02 A or ±3%)
Characteristic Curves Definite Time/Inverse/Very Inverse/Extremely Inverse/IEC Curves
Time Dial 0.5 to 11.0
0.05 to 1.10 (IEC Curves)
0.1
0.01
±3 Cycles or ±10%
Voltage Control (VC)
or
Voltage Restraint (VR)
4 to 150.0%

Linear Restraint
0.1%
—
±0.5 V or ±5%
—
Phase Overvoltage
59 Pickup #1, #2 100 to 150%

0.1% ±0.5 V or ±0.5%
(±0.02 A or ±3%)
Time Delay 1 to 8160 Cycles 1 Cycle ±2 Cycles

Ground Overvoltage
59G Pickup 4 to 150%

1.0% ±0.5 V or ±0.5%
(±0.02 A or ±3%)
Time Delay 1 to 8160 Cycles 1 Cycle ±2 Cycles
This function can only be enabled when the relay is configured in line-to-line VT and the 25 function is not enabled.
Peak Overvoltage
59I Pickup 100 to 150%

0.1% ±3%

Time Delay 1 to 8160 Cycles 1 Cycle ±3 Cycles
VT Fuse-Loss Detection
60FL A VT fuse-loss condition is detected by using the positive and negative sequence components of the voltages and currents.
VT fuse-loss output can be initiated from internally generated logic or from input contacts.
Time Delay 1 to 8160 Cycles 1 Cycle ±2 Cycles
Reconnect Enable Time Delay
79 Time Delay 2 to 65,500 Cycles 1 Cycle ±2 Cycles
Reconnect timer starts when all outputs designated as trip outputs reset.
Over/Underfrequency
81 Pickup #1, #2, #3, #4 50.00 to 67.00 Hz
(40.00 to 57.00 Hz

)
0.01 Hz ±0.03 Hz
Time Delay #1, #2, #3, #4 2 to 65,500 Cycles 1 Cycle ±2 Cycles or ±0.01%
The pickup accuracy applies to 60 Hz models at a range of 57 to 63 Hz, and to 50 Hz models as a range of 47 to 53 Hz. The accuracy
is ±0.15 Hz for a range of 52 to 57 Hz, and 63 to 67 Hz (for 60 Hz nominal) and 42 to 47 Hz and 53 to 57 Hz (for 50 Hz nominal).
Nominal Settings
Nominal Voltage 50 to 500 V

1 V —
Nominal Current 0,50 to 6.00 A 0.01 A —
VT Configuration Line-Line/Line-Ground/Line-Ground-to-Line-Line

Seal-in Delay 2 to 8160 Cycles 1 Cycle ±1 Cycle or ±1.0%