CIGRE SC-B5 Colloquium 2005 Sept.14-16 Calgary Canada

1
CIGRE SC-B5 Colloquium2005 Sept.14-16Calgary
Canada

• PS3Protection Control of Series Compensated
  networks
• Q3Are there any experiences of other unique
  series compensation distance relay applications
  where special adjustments to settings and/or
  logic are required to ensure correct protection
  performance?
• Zhao Xicai
• NARI-RELAYS CHINA
• Xczhao_at_nari-relays.com

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Protection for SC T/L

• Main ?
• Pilot distance relay
• Pilot zero sequence directional relay
• Under-reach DPFC distance relay
• Three zones phase distance relay
• Three zones ground distance relay
• Two delayed zones of zero sequence directional
  over-current relay

• Main ?
• Phase-segregated current differential relay
• Zero sequence differential current relay
• Under-reach DPFC distance relay
• Three zones phase distance relay
• Three zones ground distance relay
• Two delayed zones of zero sequence directional
  over-current relay

3
DPFC Distance Relay

• DPFC-Deviation of Power Frequency Component

4
Distance Relay

• Polarizing Voltage
• Positive sequence voltage and
• Memory voltage

5
Distance Relay

• Two Relays with Different Memory Decay time
• Operate simultaneously-Forward fault
• Operate one after another-Backward fault

6
Distance Relay

• UplvProtection Voltage of MOV.

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Zero-Sequence Directional Relay

• Additional Source Impedance Introduced