BECKWITH ELECTRIC Syncrocloser M-3410A Manuel - Page 3

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BECKWITH ELECTRIC Syncrocloser M-3410A Manuel

SYNCHRONIZING SYSTEM FUNCTIONS

Device

Number

Function

Sync Check

Phase Angle Window

Upper Voltage Limit

Lower Voltage Limit

Delta Voltage Limit

Delta Frequency Limit

Sync Check Time Delay

Dead Voltage Limit

Dead Time Delay

* Of nominal voltage.

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.

Phase Undervoltage

Pickup #1, #2

Time Delay #1, #2

* Of nominal voltage.

** When DFT is selected, the time delay accuracy is 2 cycles. When RMS magnitude is selected, an

additional time delay from 0 to +20 cycles may occur.

Directional Power

Pickup #1, #2

Time Delay #1, #2

The per‑unit pickup is based on nominal VT secondary voltage and nominal CT secondary current settings

for currents less than 14 A (2.8 A). This function can be selected as overpower or underpower in the forward

direction (positive setting) or reverse direction (negative 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).

* 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).

Negative Sequence Overvoltage

Pickup #1, #2

Time Delay #1, #2

* Of nominal voltage.

Inverse Time Overcurrent

Pickup

Characteristic Curve

Time Dial

Values in parentheses apply to 1 A CT secondary rating.

Setpoint

Ranges

0° to 90°

100.0 to 120.0%*

70.0 to 100.0%*

1.0 to 50.0%*

0.001 to 0.500 Hz

1 to 8160 Cycles

0.0 to 50.0%*

1 to 8160 Cycles

4 to 100%*

1 to 8160 Cycles

–3.00 to +3.00 PU

1 to 8160 Cycles

4 to 100%*

1 to 8160 Cycles

0.50 to 12.00 A

(0.10 to 2.40 A)

Definite Time/Inverse/Very Inverse/Extremely Inverse/IEC Curves

0.5 to 11.0

0.05 to 1.10 (IEC curves)

–3–

M‑5625 Digital Synchronizing System

Increment

Accuracy

1°

0.1%

0.5 V or 0.5%

0.1%

0.5 V or 0.5%

0.1%

0.001 Hz

0.001 Hz or 5%

1 Cycle

0.1%

0.5 V or 0.5%

1 Cycle

2 Cycles

0.1%

0.5 V or 0.5%

1 Cycle

2 Cycles**

0.01 PU

0.02 PU or 2%*

1 Cycle

2 Cycles

0.1%

0.5 V or 0.5%

1 Cycle

2 Cycles

0.01 A

0.1 A or 3%

(0.02 A or 3%)

0.1

3 Cycles or 10%

0.01

1°

0.5 V