Xantrex Technology PV-225208 Section Safety, Isolation Procedure, Anti Island Protection

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SECTION 2

SAFETY

Over/Under Voltage and Frequency

The over/under frequency and voltage detection setpoints have been chosen to be in compliance with IEEE-929 and UL1741.

Fault Condition

Voltage Range

Trip Time

(% of Nominal)

 

 

 

 

 

VAC < 50%

VAC < 104

6 Cycles

 

 

 

50% < VAC < 88%

104 < VAC < 183

2 Seconds

 

 

 

88% < VAC < 110%

183 < VAC < 228

Normal Operation

 

 

 

110% < VAC < 137%

228 < VAC < 285

2 Seconds

 

 

 

137% < VAC

285 < VAC

2 Cycles

 

 

 

f < rated -0.7

f < 59.3

6 Cycles

 

 

 

f > rated +0.5

f > 60.5

6 Cycles

 

 

 

Anti Island Protection

A digital phase-shift-loop (PSL) circuit is implemented in the DSP inverter controller to prevent “Islanding” of the PV-225208.

The DSP continuously makes minor adjustments to the power factor phase angle above and below unity. In the event of a utility outage, these adjustments destabilize the feedback between the inverter and the remaining load, resulting in an over/under frequency or voltage condition. The PV-225208 then performs an orderly shutdown. The fault condition will remain until the utility voltage and frequency have returned to normal for 5 minutes.

This method has been extensively tested and proven to exceed the requirements of UL 1741.

ISOLATION PROCEDURE

The following procedure should be followed to de-energize the PV-225208 for maintenance:

WARNING

The terminals of the PV input may be energized if the arrays are energized. In addition, allow 5 minutes for all capacitors within the main enclosure to discharge after disconnecting the PV-225208 fromAC and DC sources.

1.Turn the on/off switch to the off position.

2.Open the DC interface (PV array) disconnect switch.

3.Open the AC interface disconnect switch.

4.Open the isolation transformer circuit breaker.

5.Install lockout devices on the isolation transformer circuit breaker and PV disconnect switch.

DOCUMENT: 151811

PV-225208 Photovoltaic Inverter

2-2

 

Operation and Maintenance Manual

 

Copyright 2003, Xantrex Technology Inc.

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Contents Manual Table of Contents Operation and Maintenance Manual Section Product Description IntroductionMajor Components Main EnclosureSection Product Description Control ComponentsPower Control Unit PCU Interconnection Standards ComplianceSection Product Description Specifications Equipment SymbolSection Safety Safety Features Main Enclosure Door Interlock SwitchFault Reporting PV Ground Fault DetectionSection Safety Isolation ProcedureOver/Under Voltage and Frequency Anti Island ProtectionTorque and Wire Gauge Specifications Utility Side Isolation Transformer RequirementsInstallation Section Installation and Initial TURN-ONInstallation Instructions Cable Entry Area Array Grounding Interconnection Wiring Ground Fault DetectionPV-225208 Inverter Wiring Diagram Chassis Gnd Transformer PV Array Frame Ground DC InterfaceInterface Circuit BreakerVisual Inspection, PV Array Wiring Initial PowerVisual Inspection, Isolation Transformer WYE/WYE Visual Inspection, PV-225208System Verification Power Tracker Fine Tuning Operating States Section Operation Description of System OperationOverview Operation Features Fixed Unity Power Factor OperationUtility Voltage/Frequency Fault Automatic Reset Section OperationPeak Power Tracking Operator InterfaceCurrent Imbalance Detection DC Overvoltage DetectionSection Operation Commanding Goal State Changes Setting the Date and TimeManual State Transitions Changing Write Parameter ValuesSleeping → Power Tracking → Sleeping Automatic State TransitionsAny State → Fault AUTO-RESTART FeatureTURN-ON Procedure Section Troubleshooting General Alarm and Fault ConditionsSection Troubleshooting Programming Mode SPV Overvoltage S Bad Memory SDoor Interlock Switch Open H PV Auxiliary Switch Open HAC Voltage Too Low S AC Voltage Too High SXX25/XX26 Line Gate Drive Fault S YY27/YY28 Line Over-Current Fault SPV Over-Current Fault S DC Bus Voltage High HSection Preventative Maintenance Periodic Maintenance Section Preventative Maintenance Read-Only Parameters Section Appendix Faults CodesREAD/WRITE Parameter Menu Section Appendix Inverter StatesADC Warranty and Certification Drawings ListXantrex PV Series Limited Warranty and Registration Page Page Page Page Page Fab, Enclosure, Upper, 2 Bay, PV225208 Page Fab, Enclosure, DC Interface, PV225208 Page TB5 Source Control Specification