BE1-25 Basler Sync-Check Relay

The Basler BE1-25 Sync-Check Relay is a solid state synchronism check relay, designed to permit breaker closure only after the specified phase angle conditions have been verified and the condition satisfied for a specified time period. The design provides for ease of setting the phase angle and time period requirement through front panel thumbwheel switches. The design also includes up to five optional voltage measuring circuits to verify various line and bus voltage conditions prior to permitting breaker closure.

The Basler BE1-25 Sync-Check Relay is designed to measure the phase angle between the monitored single phase voltages on the line and bus sides of a breaker and verify this angle is less than or equal to the front panel setting. If the measured angle has met this criteria for the time period defined by the front panel setting, the output relay is energized and the breaker will be permitted to close. The allowable phase angle is adjustable over the range of 1 to 99 degrees. The time delay requirement is adjustable over either of two ranges: 1 to 99 cycles, 50/60 Hz (using the bus frequency as the reference); or, 0.1 to 99 seconds (using the internal crystal reference).

An optional target may be specified to indicate operation of the sync-check function.

In order to control the operation of the relay, one additional input (in addition to the Bus and Line potentials and power supply) is required. This input defines the position of the circuit breaker. If the breaker is open the relay will perform its function. When the breaker closes this input changes state and deenergizes the output. This input uses a contact of the breaker to define position. Two configurations of this input's circuitry - Isolated contact sensing and Non-isolated contact sensing - provide additional flexibility to the control/protection circuit designer. With isolated contact sensing, the relay monitors a current through a dedicated contact. With non-isolated contact sensing, the relay senses the presence of voltage at its input due to the closure of a non-dedicated contact.