Beckwith M-0193B Synchronizer Debugging and System Integration Guide

Important rule: The programming value must be equal to "actual circuit breaker closing time+20ms (average closing time of output relay)". For example, if the circuit breaker is actually closed for 100ms, it should be programmed for 120ms (i.e. TB1-20 to TB1-11, corresponding to 120ms).

3.2 Multiple Circuit Breaker Scenarios

If the system contains multiple circuit breakers with different closing times, external auxiliary relays need to be used to switch the time programming contacts separately. Wiring requirements:

The auxiliary relay contacts must be gold-plated dry contacts (low voltage, low current) to prevent time errors caused by changes in contact resistance.

Connect wires as short as possible (<2 feet) and use twisted pair shielded wires.

Only one time programming loop can be closed at a time, otherwise the predicted time will be incorrect.

The typical wiring is shown in Figure 3, where each circuit breaker selects a switch to control the corresponding auxiliary relay, and the relay contacts are connected to the corresponding TB1 terminal.

Detailed explanation of advanced options

4.1 Anti Moting Function

This function is enabled through an internal dip switch (default OFF). After activation, M-0193B only allows the generator to close when the frequency is higher than the system frequency (i.e. in the "fast" direction) to prevent the generator from operating as an electric motor (reverse power). This is particularly important for steam turbines, as it can prevent blade vibration damage during low-speed operation and also avoid conflicts with sensitive reactive power protection.

After activation, the Δ F OK indicator light only lights up when the generator frequency is higher than the system and the difference is within the set range. If combined with the M-0194 generator control unit, M-0194 will continue to emit "speed up" pulses until the frequency meets the conditions.

4.2 Operator Window

This option allows the operator to manually confirm before closing the switch. After the operator closes the external contact, the system will check whether the closing time of the contact meets two conditions:

Phase window: The current phase angle must be less than the preset maximum value (0 °~30 ° or 0 °~180 °, depending on the Δ F range).

Time window: The time between the contact closing moment and the predicted closing moment must be within the range of 0.2 to 6.2 seconds.

If the operator closes the contacts too early or too late, the system will prevent this closing and automatically reset to wait for the next slip cycle. This function is set through internal potentiometers R160 (phase) and R148 (time). The specific voltage angle relationship and calculation formula can be found in Section 3.0 of the manual. It is recommended to set the phase angle to no less than 15 ° to avoid false locking caused by phase jitter.

4.3 Anti Jump Function

When this function is enabled (default optional), after each closing, the internal capacitor of the device discharges to maintain the output relay for about 0.5 seconds. After that, the device power supply (TB1-27) must be disconnected for at least 10 seconds to reset and prepare for the next closing. This prevents the circuit breaker from automatically reclosing after a fault trip. If this function is cancelled when ordering, the closing pulse will continue to be issued every time the slip cycle meets the conditions, and external logic is required to prevent multiple closing.

System integration and redundancy plan

To improve reliability, M-0193B is often used in conjunction with the following devices:

M-3410A synchronous inspection/interlocking/generator protection relay or M-0188 synchronous inspection relay: These two devices provide independent phase angle supervision, which allows the closing contact to be connected in series with the closing contact of M-0193B, forming a "dual channel" redundancy. Even if one of them malfunctions, the other can still be locked and closed. The product of the failure probabilities of the two reduces the probability of closing misoperation to an extremely low level.

M-0194 Generator Control Unit: This unit provides automatic voltage and speed regulation functions, adjusting the generator voltage and frequency to match the system, and then executing precise closing by M-0193B. The combination of the two can achieve fully automatic grid connection.

Refer to Figure 1 (in conjunction with M-3410A) and Figure 1A (in conjunction with M-0188) for the connection method. The phase angle limit of M-0188 should be set slightly higher than the calculated value: Φ=360 × Δ F × (t_b+T), where Δ F is the Δ F limit of M-0193B, t_b is the closing time of the circuit breaker, and T is the time delay setting of M-0188 (recommended 0.1~0.5 seconds).

On site debugging and troubleshooting

6.1 Pre operation inspection

Power supply: Confirm that TB1-26 (N) and TB1-27 (L) are connected to 90-140Vac, with a power consumption of approximately 7VA.

Voltage input: Confirm that the Gen/Line (TB1-4, 3) and Bus (TB1-1, 2) voltages are rated at 120Vac and have the correct polarity (but can be reversed due to isolation).