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PCA2 - On-Load Protection Condition
Analyser
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• Quick,
simple ON-LOAD or OFF-LOAD injection & trip testing
• Tests Relay, Breaker and Battery simultaneously
• Captures critical ‘first trip’
• 25A high power intelligent current source
• Injects a precise current into relay independently of the
actual load current
• Records entire protection operation sequence: relay, breaker
trip and reclose
• Built-in printer for on-site hardcopy
• PC data transfer via supplied USB flash drive |
Developed in conjunction with a major European
utility, the PCA2 is a complete substation protection performance
evaluation and recording system. It tests several elements of the
protection system (Relay, Breaker & Battery) simultaneously. Its
advanced software-controlled current source can inject a precise
current into the relay even whilst the system is ON-LOAD. The
critical ‘first-trip’ of both relay and breaker can then be captured
and analysed.
It is well known that some relays and breakers can become sluggish
after a long period of inactivity. The ideal way to test any
protection system is to simulate the precise conditions that occur
during a fault whilst simultaneously recording its performance.
Performing such a test on a system that has not operated for a long
time then yields very useful data as to how the system would perform
given a real fault.
Traditionally the different protection parts (relay, breaker &
battery) have been tested individually with the circuit first being
taken off-line manually. Modern maintenance strategies call for
quick non-intrusive methods that can exercise and provide a secure
digital record of the performance of the entire protection system
with minimal outage times.
As well as operate times, the battery voltage and trip-coil current
profile can also be recorded providing data on vital aspects of
breaker and overall protection system condition. The PCA2 is a key
tool that enables a truly cost-effective Reliability Centred
Maintenance Program (RCM) for substation protection.
Features
Current Output
(General-Purpose Current Mode)
- 0-25A Range
- ±45V peak Compliance Voltage
- Duty cycle: 250VA or 10A (continuous), 500VA or
25A for 30sec.
- <0.5% Magnitude Error Typ., 1% Max, <0.2% Distortion DC-1kHz with 0.001 Hz Freq
Resolution,
< ±50 ppm (< ± 0.005%) Freq Error
- Injection start synchronised with zero
crossing and data recording
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Inputs
2x Current & 4x Voltage/Contact
(Voltage/contact channels can also be used to measure current
via additional CT-HE2A clip-on Hall probes)
Current Input (via use of CT-HE2A clip-on Hall probe)
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Resolution: 16-bits (15+sign)
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Range: +/-35A (25 RMS)
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Bandwidth: DC to 4kHz
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Current Output
(ON-LOAD Mode)
Specs as above except for:
- Software automatically phase-locks (45-65Hz)
and instantly
corrects for any load-current variation during injection.
Time Resolution/Sampling Rate
- 10,000 samples/sec
- ±0.1msec resolution
Physical
- 274x247Wx180m
- 9.5kg Weight
Interfaces
- 10/100Mbs Ethernet
- 2x USB (for MemoryStick, Barcode-reader, ext. Printer, etc.)
- 15way expansion connector for future expansion devices
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Voltage/ Contact Inputs
Each is software selectable for either voltage or contact mode.
Can be used to measure & record any arbitrary voltage or contact
(e.g. battery voltage, relay trip contacts, breaker auxiliary contacts
on-line or main breaker contacts during off-line testing)
Voltage Mode
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Resolution: 16-bits (15+sign)
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Range: +/-10V & +/-300V
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Bandwidth: DC to 4kHz
Contact Mode
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Software selectable as wet/dry,
contact/2.5-300V AC/DC voltage
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Records actual contact voltage over time (not just
on/off status)
Current Mode
(via additional CT-HE2A clip-on Hall probes)
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Specs as for dedicated current input above
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Protected against wrong polarity or incorrect
wet/dry selection
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Input Power
- 95-260VAC input / 45-65Hz AC
- 40W no load, 600W continuous max
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Environmental
- 0-50°C Operating Temperature
- 5-95% Relative humidity (non-condensing)
- IP65 Protected Enclosure (when closed), airtight, watertight.
- CE Marked, Tested to EN50081-2 (emissions) & EN50082-2
(susceptibility)
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Download the full PCA 2 brochure
 Download FREE PDF
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