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Review of Distribution Network Protection

Review of Distribution Network Protection. Lonnie Malek Oncor Electric Delivery Distribution Planning. Review of Distribution Network Protection. Oncor’s Downtown Networks Contingency Considerations in Distribution Networks Protection Considerations for Distribution Networks

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Review of Distribution Network Protection

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  1. Review of Distribution Network Protection Lonnie Malek Oncor Electric Delivery Distribution Planning

  2. Review of Distribution Network Protection • Oncor’s Downtown Networks • Contingency Considerations in Distribution Networks • Protection Considerations for Distribution Networks • Oncor’s Network Protection Review • Lessons Learned

  3. Review of Distribution Network Protection • Oncor’s Downtown Networks • Seven Total Networks • Network Substation Design • Three Transformers per Substation • Double Synchronized Ring-bus • 12 Distribution Feeders per Network • Network Delivery Voltages • 4 kV and 15 kV Single-customer Spot Network • 277/480 volt Single-customer Spot Network • 120/208 volt Grid-connected Vaults

  4. Review of Distribution Network Protection • Contingency Considerations for Downtown Networks • Oncor’s Design is 2nd Contingency • No outages under any 1st or 2nd contingency event • Load modeling must account for every combination of 2nd contingency • Loss of any 2 combinations of equipment • Substation transformers • Primary feeders • Vault transformers • Sister feeder consideration

  5. Review of Distribution Network Protection • Contingency Considerations for Downtown Networks (Cont.) • X • X

  6. Review of Distribution Network Protection • Protection Considerations for Distribution Networks • Transmission Lines • Substation Transformers • Substation Ring Bus • Distribution Primary Cable • Vault Transformers • Vault Secondary Bus • Distribution Street Grid • Network Substation • Designed to Self Clear • Network Vault

  7. Review of Distribution Network Protection • Protection Considerations for Distribution Networks (Cont.) • B • B Substation • 480 v Spot Network • B • B • Customer • Service • V • P • B • B • B • B • V • P • Network Protector • V • P • V • P

  8. Review of Distribution Network Protection • Protection Considerations for Distribution Networks (Cont.) • B • B Substation • B • B • 480 v Spot Network • Customer • Service • V • P • B • B • B • B • V • P • V • P X • X F • V • P

  9. Review of Distribution Network Protection • Oncor’s Network Protection Review • Catalog existing settings and drawings • Model fault scenarios • Verify coordination • Document findings / make revisions

  10. Review of Distribution Network Protection • Lessons Learned • Street grid voltage can dip below 0.9 PU during certain fault conditions • Relay power redundancy is important • Verify coordination and reach with back-up device(s) during 1st contingency situations • Systems with Y-Y vault transformer connections require additional considerations when modeling faults • Do not let high reliability in your network mask the importance of network maintenance

  11. Review of Distribution Network Protection Thank You!

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