Power Systems Protection Test Equipment
description
Transcript of Power Systems Protection Test Equipment
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Power Systems Protection Test Equipment
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PCA2Protection Condition Analyser
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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
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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
What does it test?
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• 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
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Connections – In use
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• Captures critical ‘First Trip’
• Minimal Outage Time – can use reclose
• Protection remains active to point of trip
• Quick, cost-effective
Online Testing – Why?
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Online Injection – How?
• Software based control-loop
• Feedback from clip-on CT
• Synchronised to Zero-crossing of load current
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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
Background
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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
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Results
TRLY: Relay Op time
LTCH: Trip latch release time
BFFR: Time when TC slug reaches stop
ACON: Time the ‘a’ contact interrupts the TC current
END: Time when TC current reaches zero
MCON: Time of transition of main interrupter contacts
Oscillographic Results Numerical Results
IPK1: Amplitude of first current peak
IPLT: Max current peak
VINI: Initial battery voltage
VMIN: Minimum battery voltage
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Typical Faults/Impending Faults Identified
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• Single multipurpose instrument
• Rapid Testing• Online test (first trip)• Archived test results• On-site printout• Enables cost-effective
CBM / RCM program
Conclusion