Transcript Slide 1

Power Systems Protection
Test Equipment
PCA2
Protection Condition Analyser
What is it?
• All-in-one quick tester for Breaker & Protection
• Can test circuit Online or Offline
• Provides all data required for CBM / RCM
maintenance programs
• Secondary Current Injection Set with timer
What does it test?
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Relay Op-Time
Breaker Op-Time & Condition (+ reclose)
Trip coil current profile
Battery Condition, CT & Wiring Integrity
‘Snapshot’ of entire protection & breaker
system in actual, live operation
Connections
• Only 2-wires + clip-on
CT
• Substation wiring not
altered
• No connections broken
or removed
• More connections gives
more info
• No need for test blocks
Connections – In use
Online Testing – Why?
• Captures critical ‘First Trip’
• Minimal Outage Time – can use reclose
• Protection remains active to point of trip
• Quick, cost-effective
Online Injection – How?
• Software based
control-loop
• Feedback from clipon CT
• Synchronised to
Zero-crossing of
load current
Background
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Developed with EDF Energy UK
1000’s of 11 & 33kV circuits
Alternative to manual injection trip-testing
Safer
Combined test with Relay Op-Time
Single instrument
Modern, on-site results viewing, printing &
archiving
Results
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Instant oscillographic & numeric display
On-screen measurements
IEEE COMTRADE format
Saved to internal Flash or USB-drive
PC display using any COMTRADE viewer
Built-in printer
Results
Oscillographic Results
Numerical Results
TRLY:
Relay Op time
IPK1:
Amplitude of first current peak
LTCH:
Trip latch release time
IPLT:
Max current peak
BFFR:
Time when TC slug reaches stop
VINI:
Initial battery voltage
ACON:
Time the ‘a’ contact interrupts the TC current
VMIN:
Minimum battery voltage
END:
Time when TC current reaches zero
MCON:
Time of transition of main interrupter contacts
Typical Faults/Impending Faults
Identified
Conclusion
• Single multipurpose
instrument
• Rapid Testing
• Online test (first trip)
• Archived test results
• On-site printout
• Enables cost-effective
CBM / RCM program