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

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

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

Relay

CT

CT

VT

VT

Relay

CT

CT

VT

VT

Source

Source

Load

B1S B1R

B2S B2R

Line 1

Line 2

RS RR

Bus S Bus R

F

Combination of two types of cross differential relay

elements:

Current-balanced relay (CBR) Directional transverse differential relay (DTR)

CIGRE Study Committee B5 Colloquium, Calgary 14-16 September 2005

Performance of Cross differential relayTests 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.

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 3New relay principles

based on non-power frequency measurement

CIGRE Study Committee B5 Colloquium, Calgary 14-16 September 2005

Example 1 Noise Generated Protection

CVT F1

F2

TS1

TS2

TR1

TR2

CS

signallimiter

Anti-aliasing A/D

operateY1

RestraintY2

Filter I

Filter II

Y1Y2

leveldetector

Relay

Ratio

Analogue

Digital

CIGRE Study Committee B5 Colloquium, Calgary 14-16 September 2005

Example 1 Frequency Response of Noise Generated Protection Scheme

CIGRE Study Committee B5 Colloquium, Calgary 14-16 September 2005

Example 2 Boundary Protection Technique

F1 F2

CS

AnalogInterface

Anti-aliasing A/D

Spectralenergy

extraction

Multichannel

filter

IopIre

leveldetector

Relay

Ratio

Analogue

Digital

I2I0

I1I1

CT

Ia

IcIb

Im1

Im2

If1

If2

Iop

Ire

operate

Restraint

CIGRE Study Committee B5 Colloquium, Calgary 14-16 September 2005

Example 2 Boundary Protection - Attenuation of Busbar Capacitance to HF Signals

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

CIGRE Study Committee B5 Colloquium, Calgary 14-16 September 2005

International Research & Development Collaboration

TsinghuaUniversity

FundamentalResearch

RelayImplementation

DynamicTests

International Research & Development Collaboration

EPRIChina

Areva T&DEAI

CollaborationCONCEPTNEW

PRODUCTSCollaboration PROVE

Top Researcher Leading manufacturer Welknown test authority

CIGRE Study Committee B5 Colloquium, Calgary 14-16 September 2005

End of Discussion

Thanks !