Specifications

February 2007
CA08101001E For more information visit: www.eaton.com
16-55
Transfer Switches
16
Transfer Switch Equipment
Appendix B — Transfer Switches — Inter-Tie Protective Relay
Appendix B
M-3410A Inter-Tie Protective Relay
Refer to the appropriate table to make protective relaying changes.
Table 16-49. M-3410A Inter-Tie Protective Relay Set Points
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.
Of nominal voltage, maximum of 600 V. This function can only be enabled when the relay is configured in line-to-line VT and the 25 function is not enabled.
Accuracy applies for a nominal current range of 2.5 A to 6 A (5 A CT) or 0.5 A to 1.5 A (1 A CT).
Of nominal current for currents less than 14 A (2.8 A).
Accuracy applies for a nominal current range of 2.5 A to 6 A (5 A CT) or 0.5 A to 1.5 A (1 A CT), and for a pickup of >5%.
Device
Number
Function Set Point
Ranges
Increment Accuracy
Sync Check
25 Phase Angle Window 0° to 90° ±1°
Upper Voltage Limit
Lower Voltage Limit
100.0 to 120.0%
70.0 to 100.0%
0.1%
0.1%
±0.5 V or ±0.5%
±0.5 V or ±0.5%
Delta Voltage Limit
Delta Frequency Limit
1.0 to 50.0%
0.001 to 0.500 Hz
0.1%
0.001 Hz
±0.5 V
±0.001 Hz or 5%
Sync Check Time Delay 1 to 8160 Cycles 1 Cycle
Dead Voltage Limit
Dead Time Delay
0.0 to 50.0%
1 to 8160 Cycles
0.1%
1 Cycle
±0.5 V or ±0.5%
±2 Cycles
Sync Check may be operated as a stand-alone function or supervised by 79 (reconnect). Various combinations of input supervised hot/dead closing
schemes may be selected. This function can only be enabled in line-to-line VT configuration and when function 27G and 59G are not enabled.
Phase Undervoltage
27 Pickup #1, #2
Time Delay #1, #2
4 to 100%
1 to 8160 Cycles
0.1%
1 Cycle
±0.5 V or ±0.5%
±2 Cycles
Ground Undervoltage
27G Pickup
Time Delay
4 to 100%
1 to 8160 Cycles
1.0%
1 Cycle
±0.5 V or ±0.5%
±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.
Directional Power
32 Pickup #1, #2
Time Delay #1, #2
-3.00 to +3.00 PU
1 to 8160 Cycles
0.01 PU
1 Cycle
±0.02 PU or 2%
±2 Cycles
The per-unit pickup is based on nominal VT secondary voltage and nominal CT secondary current settings for currents less that 14 A (2.8 A).
This function can be selected as overpower or underpower in the forward direction (positive setting). This function can also be selected for
single phase detection for line-to-ground VT.
Minimum sensitivity of 100 mA for 5 A CT (real component of current).
Loss-of-Field (Dual-Zone Offset-MHO Characteristic)
40 Circle Diameter #1, #2 0.01 to 3.00 0.01 PU ±0.01 PU or ±5%
Offset #1, #2 -2.0 to 2.0 0.01 PU ±0.01 PU or ±5%
Time Delay #1, #2 1 to 8160 Cycles 1 Cycle ±2 Cycles
27 Voltage Control
(Positive Sequence)
4 to 100%
0.1% ±0.5 V or ±0.5%
Directional Element Fixed at -13°
Negative Sequence Overcurrent
46
Definite Time
Pickup
Time Delay
3% to 300%
1 to 8160 Cycles
1%
1 Cycle
±0.1 A or ±5%
(±0.02 A or ±5%)
±2 Cycles
Inverse Time
Pickup 3% to 100%
0.1% ±0.1 A or ±3%
(±0.02 A or ±3%)
Characteristic Curves Definite Time/Inverse Time/Very Inverse/Extremely Inverse/IEC/I
2
2
t = K
Time Dial Setting 0.5 to 11.0
0.05 to 1.10 (IEC)
1 to 95 (I
2
2
t = K)
0.1
0.01
1
±3 Cycles or ±10%
For I
2
2
t = K Curve Only
Definite Maximum
Time to Trip
Reset Time (Linear)
600 to 65,500 Cycles
4 Minutes (From Threshold of Trip)
1 Cycle
±3 Cycles or ±10%
Negative Sequence Overvoltage
47 Pickup #1, #2
Time Delay #1, #2
4 to 100%
1 to 8160 Cycles
0.1%
1 Cycle
±0.5 V or ±0.5%
±2 Cycles