Summary..............................................................................................................................................6 - 4

Transformer.........................................................................................................................................6 - 5

Percent Differential Current ................................................................................................................. 6 - 5

Windings ....................................................................................................................................................... 6 - 6

Thermal Elements..................................................................................................................................... 6 - 7

Tap Changer................................................................................................................................................ 6 - 7

Currents.................................................................................................................................................6 - 8

Voltages ............................................................................................................................................. 6 - 10

Frequency ......................................................................................................................................... 6 - 11

Volts Per Hertz................................................................................................................................. 6 - 12

Harmonic Magnitude................................................................................................................... 6 - 12

Harmonics 1(Harmonics 4)........................................................................................................ 6 - 13

Harmonic Detection ..................................................................................................................... 6 - 14

Synchrocheck.................................................................................................................................. 6 - 14

Power................................................................................................................................................... 6 - 15

Energy................................................................................................................................................. 6 - 16

Power Factor.................................................................................................................................... 6 - 17

Current Demand 1......................................................................................................................... 6 - 17

Current Demand K1...................................................................................................................... 6 - 18

Current Demand K2...................................................................................................................... 6 - 18

Directional Power .......................................................................................................................... 6 - 19

Arc Flash ............................................................................................................................................ 6 - 19

RTDs ..................................................................................................................................................... 6 - 20

RTD Maximums............................................................................................................................... 6 - 20

Analog Inputs................................................................................................................................... 6 - 20

FlexElements.................................................................................................................................... 6 - 21

Events.....................................................................................................................................................7 - 1

Transient Records.............................................................................................................................7 - 1

Fault Reports.......................................................................................................................................7 - 2

Data Logger.........................................................................................................................................7 - 2

Breakers ................................................................................................................................................7 - 3

Breaker Arcing Current........................................................................................................................... 7 - 3

Breaker Health ........................................................................................................................................... 7 - 3

Digital Counters.................................................................................................................................7 - 3

Remote Modbus Device.................................................................................................................7 - 4

Clear Records .....................................................................................................................................7 - 6

DGA Monitoring .................................................................................................................................8 - 2

Device Data .........................................................................................................................................8 - 3

Dissolved Gas Analysis ..................................................................................................................8 - 3

Learned Data Records....................................................................................................................8 - 4

Energization Records ......................................................................................................................8 - 5

Digital Fault Records .......................................................................................................................8 - 6

Models....................................................................................................................................................8 - 6

Transformer Models................................................................................................................................. 8 - 6

DGA Models ................................................................................................................................................. 8 - 7

Historical Maximum Record ........................................................................................................8 - 8

Transformer Health Report ..........................................................................................................8 - 8

DGA Historical Trend .......................................................................................................................8 - 9

845 TRANSFORMER PROTECTION SYSTEM - INSTRUCTION MANUAL

Table of Contents