BECKWITH ELECTRIC Syncrocloser M-3410A Manuale - Pagina 9

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Minimum Frequency Difference

The guaranteed minimum frequency difference for Auto-Sync operation is 0.0005 Hz. However, typical units

consistently operate with frequency difference of 0.0001 Hz.

Zero Phase Prediction

Figure 4 illustrates the average closing phase error as a function of frequency difference for 80 ms, 100 ms,

200 ms, 400 ms and 800 ms breaker closing times. This data was taken under lab conditions with a constant

frequency difference.

1.5

1.0

0.8

0.6

0.4

0.2

.01

Anti‑Motoring

The Anti-Motoring feature prevents closing of the breaker when the generator frequency is slower than

the line/system frequency, thus preventing motoring power from flowing into the generator. This function is

enabled by an internal toggle switch. The default toggle switch position is "OFF" (disabled).

Anti‑Pump

The breaker close contact of the automatic synchronizer will close for approximately 0.5 second. Power

supply to the automatic synchronizer must be removed for approximately 10 seconds before another

closure is possible, regardless of the other inputs. A front panel LED (M-0193B READY) indicates that the

automatic synchronizer is active and ready to operate, provide input conditions meet their respective limits.

The automatic synchronizer can be ordered without the Anti-Pump Option. In this case, the automatic

synchronizer will close once on each slip cycle when all input conditions are within their limits and the unit

is enabled. The anti-pump option must be specified on order.

Operator Window Option

The Operator Window Option allows an operator to work in conjunction with the automatic synchronizer. The

operator's contact must be closed within a variable time and phase angle "window", otherwise the automatic

synchronizer will block closing of the breaker. The unit will then automatically reset for the next attempt to

close. The operator window option must be specified on order.

0.1

.05

FREQUENCY DIFFERENCE IN HERTZ

Figure 4 Zero Phase Prediction

M‑5625 Digital Synchronizing System

0.4

0.3

–9–

800 ms

400 ms

200 ms

100 ms

80 ms

0.5