Tvimenning’s VEE engine: validates, estimates and edits metering series with versioned time series and a full audit trail, before data goes to Elhub.
Definition
SEFTA is the workflow engine for VEEValidation, Estimation, Editing - systematic process to ensure quality of raw metering data from electricity meters. - validationThe first step in VEE - automated checks of metering data against technical and logical limits to detect obviously erroneous values., estimationThe second step in VEE - calculation of missing or rejected metering values based on historical patterns, neighbouring meters or statistical models. and export of metering dataData from electricity meters - the foundation for billing, balance settlement and market processes in the power market.. Metering data from tens of thousands of meters is never perfect: meters lose connection, clocks drift, and quality codes are read differently from one system to the next. Meanwhile the regulations require complete, quality-assured data to reach ElhubNational hub for metering data and market processes in the Norwegian electricity market. by the deadline. SEFTA closes that gap with eight validation rules covering everything from physically impossible values to clock drift and stuck meters, and an estimation cascade that fills gaps in a fixed, documented order. Every change is versioned, so it is always possible to show what the original reading was, what it was changed to, by whom and why. The name is Old Norse for mending nets - repairing what has been torn so it holds again.
In practice it is the audit trail that decides whether a VEE engine is usable. Estimating a missing value is easy; being able to explain six months later why that particular value was estimated that way is the hard part. That is why versioning is not an add-on in SEFTA but the premise: the original reading is never deleted. Order matters too - validation and estimation belong before submission to Elhub, not after a message has been rejected.
In practice
In practice it is the audit trail that decides whether a VEEValidation, Estimation, Editing - systematic process to ensure quality of raw metering data from electricity meters. engine is usable. Estimating a missing value is easy; being able to explain six months later why that particular value was estimated that way is the hard part. That is why versioning is not an add-on in SEFTA but the premise: the original reading is never deleted. Order matters too - validationThe first step in VEE - automated checks of metering data against technical and logical limits to detect obviously erroneous values. and estimationThe second step in VEE - calculation of missing or rejected metering values based on historical patterns, neighbouring meters or statistical models. belong before submission to ElhubNational hub for metering data and market processes in the Norwegian electricity market., not after a message has been rejected.
