1. CIGRE Study Committee B5 Colloquium, Calgary 14-16 September 2005 AREVA T&D Automation Protection & Control of Series Compensated Networks Z Q Bo PART 3 Non Distance Protection PART 4 Dynamic Tests

2. CIGRE Study Committee B5 Colloquium, Calgary 14-16 September 2005 Non Distance Protection PART 3 Current differential & Directional Comparison relays are little affected by series compensation Potential a problem for Current Differential relay for long UHV lines where charging current is too high Directional Comparison might be a better choice in such case Cross Differential protection relay for double circuit lines is not effected by series compensation and does not require communication link

3. CIGRE Study Committee B5 Colloquium, Calgary 14-16 September 2005 Comparison of electric quantities between the double lines Similar  no fault, or external fault Difference  internal fault Cross Differential Relay Combination of two types of cross differential relay elements: Current-balanced relay (CBR) Directional transverse differential relay (DTR)

4. CIGRE Study Committee B5 Colloquium, Calgary 14-16 September 2005 Performance of Cross differential relay Tests conducted at China EPRI show » The relay is able to offer fast response for all fault types within the instant protected zone, which is about 90% of the total line length. » The relay is able to successively trip for all types of remote in zone fault outside the instant protected zone after remote CB operates. » The relay is able to clear high resistance fault for EHV long lines both instantly and successively. » The relay is able to trip the faulted phase only for evolving faults on both of the two lines.

5. CIGRE Study Committee B5 Colloquium, Calgary 14-16 September 2005 Super-imposed Component based Protection Surge Impedance Relay Noise Generated Protection Boundary Protection AREVA – Tsinghua Research collaboration PART 3 New relay principles based on non-power frequency measurement

6. CIGRE Study Committee B5 Colloquium, Calgary 14-16 September 2005 Example 1 Noise Generated Protection

7. CIGRE Study Committee B5 Colloquium, Calgary 14-16 September 2005 Example 1 Frequency Response of Noise Generated Protection Scheme

8. CIGRE Study Committee B5 Colloquium, Calgary 14-16 September 2005 Example 2 Boundary Protection Technique

9. CIGRE Study Committee B5 Colloquium, Calgary 14-16 September 2005 Example 2 Boundary Protection - Attenuation of Busbar Capacitance to HF Signals

10. CIGRE Study Committee B5 Colloquium, Calgary 14-16 September 2005 Dynamic tests Most effective means for relay development and assessment of relay performance Critic fault positions and conditions RTDS tests for relay development Analogue & RTDS tests for relay approval AREVA – China EPRI development collaboration PART 4

11. CIGRE Study Committee B5 Colloquium, Calgary 14-16 September 2005 International Research & Development Collaboration Top ResearcherLeading manufacturerWelknown test authority

12. CIGRE Study Committee B5 Colloquium, Calgary 14-16 September 2005 End of Discussion Thanks !