Basler BE1-60 Voltage Balance Relay Setting Test

Slowly increase the A-phase voltage of circuit 1 (while keeping the other phases rated), and observe when the output relay of circuit 2 shifts (indicating that the voltage of the phase where circuit 2 is located is relatively low). According to the manual, the change point should be between 125~127Vac (i.e. 104~106% of the rated voltage) - because at this point, the difference reaches more than 5%. Record the value and compare it with the theoretical value.

Reduce the phase voltage of circuit 1A back to 120Vac, and the relay should automatically reset (output returns to normal state) after about 0.75 seconds. Reset the target indicator.

6.2 High setting value test (verify setting range)

Set the setting switch to the highest position K (50%).

Slowly reduce the A-phase voltage of circuit 1 (while keeping the other phases rated) until the output relay of circuit 1 shifts (indicating that the voltage of circuit 1 is too low). In theory, the change point should be between 57~63Vac (i.e. 47%~53% of the rated voltage), as the difference reaches about 50% at this time.

Record the change point and calculate whether the error is within the allowable range (± 1V or ± 5% of the set value, whichever is greater).

6.3 Multiphase testing (applicable to three-phase input types B/C/D)

Repeat the above steps and perform single-phase voltage rise and fall tests on phases B and C respectively to ensure that the differential circuit of each phase is working properly.

6.4 Verification of output contacts and target indicators

If equipped with a "push test" button, use a non-conductive rod to press the corresponding test button for circuit 1 or circuit 2, observe whether the corresponding output relay is excited (target on, contact status changes), and verify the integrity of the external wiring circuit.

For current type targets, it is necessary to ensure that the tripping circuit current is not less than 200mA, otherwise the target will not light up.

6.5 System cascading adjustment (actual locking effect)

Under simulated PT disconnection conditions (such as manually disconnecting one phase voltage), observe whether BE1-60 can issue a lockout signal before the overcurrent relay acts. An oscilloscope or event recorder can be used to capture the timing of actions, ensuring that the locking contact opens before the tripping contact.

Maintenance and Storage Suggestions

BE1-60 is a solid-state relay with extremely low daily maintenance requirements. It is recommended to conduct a complete functional test once a year to confirm that the setting values and action times are still within the specifications. If the relay is kept in stock for a long time, it should be powered on for 30 minutes every year to maintain the performance of the internal electrolytic capacitor and extend its service life. In case of malfunction, on-site dismantling and repair should not be carried out, and Basler Electric technical support should be contacted in a timely manner.