Testing Numerical Transformer Differential Relays


  Testing Numerical Transformer.ppt (Size: 534 KB / Downloads: 8)

INTRODUCTION

Commissioning versus Maintenance Testing
Types of Transformer Differential Protection:
Restrained Phase Differential
High Set Phase Differential
Ground Differential

Commissioning

Common Practice:
Test all numerical relay settings –
verify settings properly entered
Easily facilitated using computer –
automate test set & store results
Hundreds of tests are possible –
numerical relays have many settings

CONCLUSIONS

Transformer Differential Boundary Test(Commissioning)
Ground Differential Sensitivity Test(Commissioning/Maintenance)
Harmonic Restraint for Transformer Inrush(Maintenance).