Procedure for Phase Change

Created by Patrícia Siqueira, Modified on Wed, 4 Oct, 2023 at 3:39 PM by Patrícia Siqueira

Through the Bushing Exchange submenu is possible to change the parameters of the bushings in operation, allowing the replacement by the backup bushing without losing the parameters of the bushings monitored in any of the following situations:

Entry into operation of the reserve unit;
Exiting operation of the backup unit and returning to usual unit operation;
Replacement of any bushing monitored with a new bushing.

ℹ️ To access this menu, follow the step-by-step instructions below:

Press the P key for about 5 seconds;
Insert the password to access the Treetech menus (default: 0000) and press Enter;
On the Menus, go to Measurement Module;
After selecting, go to Measurement Module, navigate for Bushing Exchange and choose the ideal configuration for your equipment.

This feature is helpful in applications with single-phase equipment banks since the data for the backup unit can be pre-programmed in the BM. For service entrance or exit, it is only necessary to inform this condition in the Bushing Exchange menu.

First, select the desired three-phase set.

Set: to which set the bushing to be changed belongs.
1. Adjustment Range: set 1, 2, 3, or All.
Bushing Exchange: this is the selection of the bushings that will remain in operation.
1. Adjustment Range:
  - ABC (bushings A, B, and C in operation, Reserve out of service),
  - ABR (Bushings A, B, and Reserve in operation, Reserve out of service),
  - ARC (Bushings A, Reserve, and C in operation, B out of service), or
  - RBC (Reserve, B and C bushings in operation, A out of service).

⚠ It is crucial to update the Initial Capacitance and Initial Delta Tangent values for the changed phase. And redo the Reference Calculation to ensure optimal BM operation after bushing changes.

When any bushing is changed, the bushing monitor will automatically go to the Recalculate Reference parameter. The bushing change will happen if you confirm the YES option in this parameter.

⚠ It is relevant to check the values parameterized as Address for the BM-MM that will return to use or set as Backup to ensure optimum communication between HMI and MM.

If you have any problems or difficulties with the procedure, please do not hesitate to contact us!

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