Technical FAQs

Ask a Question

Why is my recloser/sectionaliser showing incorrect system voltage readings after SCEM replacement?

Issue
Recloser or sectionaliser is displaying incorrect system voltage after SCEM replacement

Product Line
U, N, W, RL series switchgear

Environment
Calibration

Resolution
Each switchgear (U, N, W, RL series) is calibrated in factory for voltage measurement in order to have voltage readings in the expected specifications. Calibration (CVT) data for each switchgear 
is stored in SCEM and used by the controller to interpret signals from CVTs into the primary voltage readings on control panel. When the SCEM is replaced, it is very likely that CVT data (as well as other data) in the new SCEM is not correct.
 
Therefore, in order to have expected voltage readings again, the CVT data must be corrected by one or both of the following steps:
1. Reload the latest CVT data calibration file (cal file) of the same switchgear.
- How to get this cal file? Please to refer to FAQ “How I can get Cal files” or attached CVT Calibration procedure.
2. Recalibrating the voltage measurement. This is done on Calibration menu in WSOS.
- Please refer to FAQ on "How to recalibrate the CVT measurements of a Recloser/Sectionalizer using WSOS" here: FA336164
Was this helpful?
What can we do to improve the information ?