8–6 845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
DIGITAL FAULT RECORDS CHAPTER 8: TRANSFORMER M&D
Digital Fault Records
The Transformer Digital fault record is generated by the 845 relay for every successful
transformer trip event that occurs. The recorder can only be retrieved using EnerVista 8
Series Setup
software. Six of the latest Digital fault records are supported by the 845 relay
based on the FIFO concept.
Each Digital fault record contains:
• Oscillography and pre/post configured electrical phasor data generated during a trip
condition
• Pre and post fault gas ppm data
• Electrical and thermal data captured during fault
• DGA models computed with pre/post fault gas ppm data, and
• A PDF report capturing integrated fault data
Models
Models consist of transformer operational data represented in a constructive manner
using electrical, thermal and DGA data. This section contains transformer models and DGA
models.
Transformer Models
Transformer models represent transformer operational electrical, thermal and DGA data
based on learned data in the form of a trend chart. Each trend chart consists of computed
or monitored parameter trends, classified based on relevancy as a group of 10
parameters.
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