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The myPV ClearSky™ PLUS is a standardized product, supported by documentation 
and resources to ensure your success.

Technical Documents

For the most up to date product drawings, CAD blocks, and application guides visit our 
Technical Documents page by registering on our 

Support Resources page.

MV Separable Connectors

Also referred to as “Elbows”, separable connectors are medium voltage (MV) 
components that provide a watertight, fully electrically insulated, electrical termination 
for MV conductors on both the Utility and Solar sides of the myPV ClearSky PLUS. All 
MV separable connectors support IEEE 386 compliant interfaces.

Although we do not have any preference for brand of manufacture, Eaton and ABB both 
have excellent product catalogs that illustrate the breadth of available products, how 
they may be used, and available part numbers.

Major Manufacturers Include:

ABB - Elastimold [PDF]

Eaton - Cooper Power Systems [PDF]

3M - Separable Connectors [PDF]

Summary of Contents for ClearSky Plus

Page 1: ... on our website at www myPV pro You may also contact support via phone or email Support Line M F 9am 5pm Eastern 470 387 9011 Support Email operations solar ops com Introduction Resources Theory of Operation Design Considerations Protection Relay Settings Receiving Electrical Terminations Network Integration Pre Energization Checks Initial Energization Operational Testing Commercial Operation Spar...

Page 2: ...and reliability as our top priority Built to last with heavy 11 gauge powder coated steel wide temperature industrial rated electronics and fully integrated in a UL 508a controls facility the product line conforms to the following standards Padmount gear conforms to applicable ANSI IEEE and NEMA standards Constructed with UL or ETL recognized components Circuit breaker ETL listed per file 4000068 ...

Page 3: ...ing Default configurations include SEL 735 metering with revenue grade CT and PT instrumentation Metering make model and brand may be modified to alternative hardware to satisfy individual Customer requirements Additional standard options available below Protection Relaying Reclosing All configurations of the myPV ClearSky PLUS use a SEL 751 with specific I O and software features to support the t...

Page 4: ...dashboard for commissioning agents and engineers to access metering and relay telemetry as well as relay event information Data is available quickly and early without the need for any special software or skillset This feature does not interfere with any third party monitoring or SCADA and may be disabled or upgraded by the Customer at any time Networking Communications All configurations of the my...

Page 5: ...included features UPGRADE Arc Flash Sensing w highspeed I O for fast tripping Integrated fiber optic arc flash detection UPGRADE Generator side voltage sensing for MicroGrid Vsync capabilities Arc Flash Sensing included MV Interface Dual Bushings DEFAULT Three 3 MV Interfaces on the Utility side dead front and three 3 MV Interfaces on the Solar side dead front OPTION A total of six 6 MV Interfaces...

Page 6: ...the myPV ClearSky PLUS s integrated metering relaying and automated switching devices OPTION Upgrade the myPV IQ license to support full facility device inverters trackers weather stations other monitoring and control as the primary SCADA system Utility DER Interface DEFAULT Not included OPTION Additional SEL RTAC 3505 installed inside myPV ClearSky PLUS control cabinet to support facility to offt...

Page 7: ...l push button single phase testing operations as well as remote SCADA 1 phase trip operations as well A second wire glass viewing window has been added opposite the first to allow for improved cabinet internal component inspections from the outside The control cabinet now has a dedicated chase to allow for network cable routing via the MV cabinet no external conduit runs are required Metering and ...

Page 8: ...ors are medium voltage MV components that provide a watertight fully electrically insulated electrical termination for MV conductors on both the Utility and Solar sides of the myPV ClearSky PLUS All MV separable connectors support IEEE 386 compliant interfaces Although we do not have any preference for brand of manufacture Eaton and ABB both have excellent product catalogs that illustrate the brea...

Page 9: ...aximum voltage rating A standard set of options may be added to any of the frame sizes to configure the standard product to meet individual Customer requirements The standard product specifications are listed below myPV ClearSky PLUS 2021 Product Line Representative Cross Section Product Line Specifications ...

Page 10: ...Resources 10 NOTE Contact us is you have a 35kV application we can support you this frame size is not currently within our standard product line ...

Page 11: ...e Insertion Side Doors Open East Pre Insertion Side Transformer Product Photos While myPV ClearSky products do vary in size all product frame sizes are arrange in the same manner The following orthographic photos provide a visual reference for common locations of common features ...

Page 12: ...Resources 12 East Pre Insertion Side Potential Transformers PTs NE Corner Pre Insertion Side Back Side West Terminations Side Doors Open NW Corner Back Side Terminations Side ...

Page 13: ...Resources 7 West Terminations Side Current Transformers CTs West Terminations Side LV Cabinet Cable Entry West Terminations Side LV Cabinet Network Entry Front Doors Open 13 ...

Page 14: ...urces 8 South Front Side RVC Controller Metering Relay Cabinet East Pre Insertion Side East Pre Insertion Side MV Fuse HoldersFuses Silencers Shipped w Equipment East Pre Insertion Side Transformer Side 14 ...

Page 15: ...Resources 15 East Pre Insertion Side Transformer MV VFI Breakers North Back Side West Terminations Side West Terminations Sid MV Cabinet Cable Entry ...

Page 16: ...Resources 16 West Terminations Side LV Cabinet West Terminations Side LV Cabinet Terminal Blocks 2 AWG Cu ...

Page 17: ...that are determined by the facility s line to line voltage rating Applications that have interconnection voltages equal to or below 25kV line to line are supported NOTE Contact us is you have a 35kV application we can support you this frame size is not currently within our standard product line Determine Your Facility s Voltage Class ...

Page 18: ...Resources 18 Continuous Current Sizing All myPV ClearSky PLUS frame sizes support a maximum continuous current rating of 600A Determine Your Facility s Continuous Current Sizing ...

Page 19: ...rconnection voltage to a range that the meter s inputs can accept typically a nominal 120V As an example the ratio of a PT e g 60 1 will result in a voltage at the meter of 119 993V for a 12 47kV interconnection The Math The Interconnection Voltage 12 47 kV 1000 12 470V L L The Line Voltage 12 470V L L sqrt 3 7 199 558V L N The PT s Output Voltage 7 199 558V L N 60 119 993V Most meters will accept...

Page 20: ...l operating conditions A 400 5 CT with a rating factor of 2 0 will provide measurements of up to 800A before saturating Regardless of what PT or CT ratio is ultimately selected the meter and protection relay devices are configured to understand what instruments are connected via the PTR Potential Transformer Ratio 60 1 60 and CTR Current Transformer Ratio 300 5 60 settings variables The selection ...

Page 21: ...Resources 21 ...

Page 22: ...Resources 22 ...

Page 23: ...A Electrical loads are distributed on each phase and along the distance or the distribution line to distribute the loads evenly The act of balance loads across phases and using LVR s to ensure voltage is appropriate for this loads falls to the Utility s engineering and planning teams When a moderately sized solar Facility is added to that same distribution feeder say 5MW the step up transformers r...

Page 24: ... economical Soft Start option for a solar Facility until now How Pre Energization Works The myPV ClearSky PLUS provides a soft start through a process we call pre energization During a traditional energization event the inrush current is caused because the step up transformers need to magnetize they need to be charged Grid Energized Facility is De Energized Electrically speaking the grid is energi...

Page 25: ...ondary Connection Since the Facility s MV loop and step up transformers are being energized by the grid itself they are energized at the same voltage at the same frequency and at the same phase alignment Once pre energized the pre insertion transformer is bypassed to allow for the free flow of unrestricted current between the grid and the Facility Pre Insertion Transformer is Bypassed ...

Page 26: ...y s interconnection and medium voltage MV loop feed to support the additional secondary voltage connection the same ISU Dual Primary and Secondary Electrical Connections to First ISU The myPV ClearSky PLUS s low profile and compact design provides Developers and Engineers and unprecedented level of flexibility regarding installation location While many customers choose to incorporate the padmount ...

Page 27: ... Clearances While the myPV ClearSky PLUS is very compact appropriate electrical service and door swing clearances should be considered prior to determining final pad dimensions and placement of conduits entry points All myPV ClearSky PLUS Mechanical drawings provide dimensions of electrical termination cabinet conduit locations and open door swings Visit our Technical Documents page by registering...

Page 28: ...Design Considerations 28 myPV ClearSky PLUS 25kV Termination Cabinet Door Swing ...

Page 29: ...ted on that is appropriately designed to support its weight and footprint Common foundations include but are not limited to Customer Poured Concrete Equipment Pad Pre cast Concrete Equipment Box Pad Fiberglass Equipment Box Pad Many Customers successfully mount and electrically terminate the myPV ClearSky PLUS without a vault or pit pad configuration however we recommend that you review ...

Page 30: ...dware cost of each type of isolation device but also the cost of operation While a qualified technician with appropriate PPE may operate a GOAB from ground level Disconnects and Fused Cutouts especially those mounted on taller 35 poles may require a MV Bucket Truck to operate safely Auxiliary Power The myPV ClearSky PLUS DOES NOT REQUIRE any external auxiliary power for control or communications f...

Page 31: ... cable passthrough to the Control Cabinet network switch Network cables should be routed into LV Termination Cabinet No external conduit or cabinet penetrations are required Because the LV Termination Cabinet is dead front with fully insulated electrical components and labeling there are no special network cable voltage ratings required If running any type of copper conductor based network cabling...

Page 32: ...ble for download under the myPV pro Support Resources webpage ClearSky PLUS RDB template files include 1 Repair Service vs Automatic Mode 2 Power Supply UPS Battery TRIP 3 Automated Inrush Mitigation Switching 4 Single Phase TRIP Support ClearSky PLUS RDB template files require customer settings to support 1 Interconnection protection element assignment and settings are required to be programmed b...

Page 33: ... Protection Relay can 3 Phase TRIP Only by pushbutton the Protection Relay cannot 3 Phase CLOSE Only by pushbutton the Protection Relay can 3 Phase CLOSE with Automated Inrush Mitigation Switching By pushbutton or SCADA the Protection Relay can 1 Phase TRIP Only by pushbutton the Protection Relay can 1 Phase CLOSE Power Supply UPS Battery TRIP The myPV ClearSky PLUS s SEL 751 is pre programmed to ...

Page 34: ...it coordinates the CLOSE event with a secondary logic device called the RVC Controller CLOSE SEQUENCE 1 CLOSE command to SEL 751 RVC Local Software SCADA or Reclosing 2 If ready SEL 751 signals RVC to start automated switching sequence maintained signal 3 RVC CLOSEs LV Relay Contactor maintained coil 4 RVC Controller verifies LV CLOSE via AUX contact 5 After delay RVC Controller signals SEL 751 to...

Page 35: ... 52a 5 SEL 751 inhibits RVC Controller operation with NOT READY state RELAY RVC OPERATION BEHAVIORS If the SEL 751 sends a CLOSE signal to the RVC Controller starting the switching sequence but the SEL 751 does not receive a MV CLOSE command from the RVC Controller within 30s the CLOSE attempt will be abandoned Normally the RVC Controller would request a MV CLOSE at 15s following the SEL 751 s ini...

Page 36: ...g behaviors as required by IEEE 1547 Any single phase A B or C may be toggled OPEN TRIP or CLOSED via pushbutton or SCADA operation by following the procedures described in the section Operational Testing Protection Settings File Loading Solar Ops at the time of device integration and testing will load either a template RDB file or a Customer Modified RDB file with interconnection specific setting...

Page 37: ...s Account Manager Arrival The Customer is responsible for receiving and unloading of all equipment deliveries The myPV ClearSky PLUS will arrive to your shipping address location palletized on an open flat bed truck Whenever possible your Solar Ops Account Manager will share tracking information and put the driver directly in contact with the receiving party for receiving coordination NOTE See lif...

Page 38: ...Receiving 38 Equipment is Wrapped Palletized Typically Equipment Delivery ...

Page 39: ...itate safe lifting NOTE The device s weight distribution is NOT CENTERED and lifting operations should only be performed by an experienced lifting operator using the integrated fork channels The myPV ClearSky PLUS is built tough but also contains sensitive electronics that should be treated with care Avoid events that include dropping jarring shaking or excessive vibration Any of these activities ...

Page 40: ...k Channels From Preferred Lifting Side Setting The myPV ClearSky PLUS should always be set on level flat and solid foundation that is properly designed to support it s weight and size myPV ClearSky PLUS Set on Equipment Pad ...

Page 41: ...et 8 sets total not included All eight 8 nuts should be tightened in accordance with the Torque Schedule and threaded stud specification NOTE Some EPCs will choose to install a bead of caulk around the perimeter of pad mounted equipment We encourage this as an added barrier to entry to prevent insect entry into the cabinet but caulking is not required Two of Four Installed and Torqued SS Strap Cla...

Page 42: ...the MV cables that are routed from the bottom of the MV Fused Cutouts to the Pre Insertion Transformer are supported by a L channel of fiber glass that should be removed and discarded prior to energization All zip ties should be carefully cut to prevent damage to the to the MV cables removed and discarded ...

Page 43: ...ee 3 potential transformer PT fuses inside the center switching cabinet The zip ties are installed to ensure the fuses do not come loose during shipping and need to be removed The PTs may be most easily accessed prior to any medium voltage MV conductors being pulled into the MV Termination cabinets All cut zip ties should be collected and discarded ...

Page 44: ...Insertion Transformer is electrically protected on the MV side by a set of three 3 fused cutouts The fuses require a special bracket to be assembled for both the bottom and top of the fuse for mounting All fuses and mounting hardware are shipped with the myPV ClearSky PLUS but require assembly as shown below ...

Page 45: ...Receiving 45 Top Fuse Mounting Hardware Three 3 MV Fuses Fully Assembled Installed ...

Page 46: ... separable connectors will be either 200A load break or 600A dead break IEEE 386 compatible interfaces Whether 200A or 600A all bushing wells and inserts will be shipped with the device your MV contractor only needs to purchase and install the elbows Parking stands are installed for all six 6 connections however parking bushings are not included as these are not required for normal commercial oper...

Page 47: ...Electrical Terminations 47 MV Termination Cabinet 200A Bushing Wells Capped for Shipping200A Inserts Shipped w Device Not Shown ...

Page 48: ...Electrical Terminations 48 LV Termination Cabinet Secondary Voltage Connections ForLugged 2 AWG Cu Middle Right ...

Page 49: ...ircuits be connected in parallel for a short period of time improper phasing will result in an electrical event that could be unsafe and also damage all connected equipment Required Phasing Connections Proper A B C phasing is required between the MV terminations of the myPV ClearSky PLUS and the first ISU s primary connections Proper A B C phasing is required between the LV terminations of the myP...

Page 50: ...able management scenarios the CTs may be left unmounted so long as the phase orientation and control wiring is not modified Solar Ops applies phase labels to each CT that indicate Up and Top for each CT to help avoid a CT from being flipped in the event it is unmounted during MV cable installation CTs are solid core and require being slipped over the MV conductor The CTs have been specified with l...

Page 51: ...cally tied to the first ISU the myPV ClearSky PLUS s low voltage lugged terminal blocks are designed for 2 AWG Cu Stranded conductors to be landed and torqued to complete the pre energization circuit LV Terminal Blocks for 2 AWG Cu Stranded Conductors ...

Page 52: ...Electrical Terminations 52 LV Termination Cabinet ...

Page 53: ...Electrical Terminations 53 Sealed MV Conduit Conduit Entries All conduits should be adequately sealed to prevent the ingress of water moisture and hazrdous gases into the MV termination cabinet ...

Page 54: ...ch All internal networkable devices are connected to that central switch and may be accessed via MODBUS TCP IP Web Hosted Interface or Vendor Provided Software By default the myPV ClearSky PLUS s ClearSky Control Cabinet has a 8 port Fast Ethernet unmanaged switch Using only standard features the included networkable devices will use six 6 of the ports allowing for two 2 spares In addition the Cle...

Page 55: ...l of the LV Termination Cabinet labeled NETWORK to allow media routing between termination cabinet and the Control Cabinet The gland is oversized to allow multiple media runs and pre terminated ends Communications media may be managed in parallel to the PT CT wire runs and it is recommended to foam duct seal the wire gland to prevent moisture entry into the Controls cabinet Media Routing Wire Glan...

Page 56: ...Network Integration 56 ...

Page 57: ...ard 8 Port Switch Optional MM Fiber Switch Other Options Available Media Connection Ethernet and or fiber media will need to be terminated and tested by the installer and connected to the network switch inside the Control Cabinet ...

Page 58: ...ion 58 Device Communications The myPV ClearSky PLUS supports multiple communication options for all networkable devices the support third part monitoring SCADA and even IT reporting requirements Communications Options ...

Page 59: ... and the SEL 751 Protection Relay the RVC Controller provides a dedicated MODBUS map for the purpose of remote monitoring state and alarm conditions The following register map may be used for remote monitoring of the automated inrush mitigation switching sequence ...

Page 60: ...IDE the myPV ClearSky PLUS device e g parking MV bushings in the MV Termination Cabinets IS NOT sufficient for proper isolation Improper or lack of LOTO isolation procedures will result in staff being exposed to the full interconnection voltage and could result in injury and or death The following steps should only be conducted by authorized and qualified commission staff Skills Tools Required Com...

Page 61: ...n the device grounding rod and the associated ground will be 2Ω Both the Utility side and Solar side grounds should be verified Typical Utility Side Solar Side Grounding Rod MV Termination Verification On both the Utility Side and Solar Side all six 6 MV elbows should be be fully seated on the inserts 200A load break connections are pushed on until the are fully seated and no color ring is visible...

Page 62: ...Pre Energization Checks 62 All Six 6 MV Elbows Fully Seated MV Insert Yellow Color Ring Exposed When Properly Installed Color Should Not Show ...

Page 63: ...ed to ensure they are in the OPEN indicate GREEN position Breaker OPEN GREEN Indication Example VFI Breaker Position Verification The myPV ClearSky PLUS has three 3 independent MV VFI Breakers that provide protection isolation reclosing and can support single phase drop testing as well ...

Page 64: ...Pre Energization Checks 64 View of Center Switching Cabinet Through Wire Glass Window ...

Page 65: ...and provide inaccurate measurements Visually verify that all CTs are installed on the correct phase reference Yellow phase tags above MV terminations all arrows should point Up and Top should be visible Physically inspect all twelve 12 control wire leads for the CTs to ensure they are seated firmly pull test and that the wire terminations are on the wire conductor not the wire insulation Although ...

Page 66: ...Fuse Verification Inside the center switching cabinet three 3 fused PTs may be observed using the one 1 external wire glass windows Visually verify all three 3 PT fuses are intact A fuse that is indicating see example image is not longer intact and will require replacement prior to operation ...

Page 67: ...Pre Energization Checks 67 View of Three 3 PT Fuses Through Wire Glass Window ...

Page 68: ...of the front side of the ClearSky PLUS ClearSky Plus Cabinets The ClearSky Plus has two cabinets integrated The ClearSky control cabinet locates on the right and the ClearSky Plus in rush mitigation control cabinet locates on the left ...

Page 69: ...d set Use a multimeter to verify all threes 3 fuses have continuity Two 2 spare AC fuses are included in the orange envelop mounted on the back of the Control Panel swing door Two 2 spare DC battery fuses are included in the orange envelop mounted on the back of the Control Panel swing door ClearSky Right Control Panel Preparation Prior to energization preparation of the Control Panel is intended ...

Page 70: ...e image number callouts for additional verification locations 1 Perform a gentle control wiring pull test of the AC control power terminations 2 Perform a gentle control wiring pull test of the PT CT and VFI Breaker position terminations Control Panel Wiring Pull Test Locations ...

Page 71: ...Repair Service Mode Rotate the Mode Selector counter clock wise CCW until the RED handle points to OFF While in Repair Service Mode the Protection Relay cannot CLOSE the MV breakers only TRIP commands or TRIP on fault actions will operate Mode Selector Switch Shown in ON Automatic Position ...

Page 72: ...ify both battery fuses for continuity Install both battery fuses leave installed 4 Circuit breaker Reference Fuse Holders leave Open 5 OPEN by pulling the top and swinging down all three 3 low voltage output Reference Fuse Holders leave OPEN Use a multimeter to verify all threes 3 fuses have continuity Two 2 spare AC fuses are included in the orange envelop mounted on the back of the RVC Panel swi...

Page 73: ...s 73 ClearSky PLUS Control Panel Verification Locations Finally switch the ClearSky PLUS Control Panel Mode Selector into Repair Service Mode Rotate the Mode Selector counter clock wise CCW until the RED handle points to OFF ...

Page 74: ...ergization Checks 74 While in Repair Service Mode the Protection Relay cannot CLOSE the MV breakers only TRIP commands or TRIP on fault actions will operate Mode Selector Switch Shown in ON Automatic Position ...

Page 75: ...rom the interconnection Appropriate personal protective equipment PPE electrically rated tools and knowledge of the energization process are required perform the energization process Improper PPE tools and or knowledge will result in staff being exposed to the full interconnection voltage and could result in injury and or death The following steps should only be conducted by authorized and qualifi...

Page 76: ...aff members e A written communication plan that includes who will coordinate the procedures execution and the halt of the procedure in the event of abnormal operation f A review of on site and local emergency response resources including fire extinguishers first aide kits first responders hospitals police fire and EMS myPV ClearSky PLUS Commissioning Tools PPE Required 1 Multimeter 120V AC RMS and...

Page 77: ...ts integrated The ClearSky control cabinet locates on the right and the ClearSky Plus in rush mitigation control cabinet locates on the left View of the front side of the ClearSky PLUS DANGER All Steps Following This Sentence Will Introduce Interconnection Voltage to the Facility and the myPV ...

Page 78: ...ase C as it is labeled at the interconnection 2 In the Control Cabinet use a Multimeter set to AC RMS to verify the presence of 120V AC voltage 10 108 132V at locations A 602A FU3 and B either 10A PASS If 120V AC is present phase C has been verified and control power commissioning may begin Proceed to Control Power Commissioning FAIL If 120V AC is not present phase C has not been verified and corr...

Page 79: ... Holder AC Line 001 2 Use a Multimeter set to AC RMS to verify the presence of 120V AC voltage on the bottom input side of the power supply 3 Use a Multimeter set to DC to verify the presence of 24V DC 0 1V 23 9 24 1V voltage on the top output side of the power supply 4 If the DC voltage is not 24V DC Verify the DC OK LED is illuminated Green and Use the potentiometer and a small screwdriver to ad...

Page 80: ...erifications 1 Proper Battery UPS Energization 2 Networking SCADA Equipment Energization 3 Metering Protection Relay Energization Commissioning Steps 1 Verify both automotive style DC fuses are installed on the battery 2 Use a Multimeter set to DC to verify the presence of proper voltages at the following locations on the UPS 24V DC 0 1V 23 9 24 1V voltage on the top input terminals of the UPS ...

Page 81: ...etwork Switch Based on Customer options there may be additional devices RV50 Cellular Modem myPV IQ Edge Computer for myPV IQ Remote Interface BRKR A Phase A Tavrida VFI Control Module BRKR B Phase B Tavrida VFI Control Module BRKR C Phase C Tavrida VFI Control Module 5 Located on the front swing panel dead front Verify the following components have signs for energization SEL 735 Power Quality Met...

Page 82: ...ed Commissioning Steps 1 Verify phase C voltage by using a Multimeter set to AC RMS to verify the presence of 120V AC voltage 10 108 132V at locations C 602 a If 120V is present CLOSE the 10A fuse holder associated with 602NOTE The corresponding L N interconnection voltage for Phase C should also be read on both the SEL 735 Meter and SEL 751 Protection Relay ...

Page 83: ... for Phase B should also be read on both the SEL 735 Meter and SEL 751 Protection Relay 3 Instruct the MV contractor to energize phase A as it is labeled at the interconnection Verify phase A voltage by using a Multimeter set to AC RMS to verify the presence of 120V AC voltage 10 108 132V at locations A 600 If 120V is present CLOSE the 10A fuse holder associated with 600NOTE The corresponding L N ...

Page 84: ...kers and fuses During the Pre Energization checks the callout circuit breakers and fuses were open 1 Installed Leave the two fuses in with continuity checked 2 Close by swinging up and pushing in the fuse holder until there s a click the AC Source Fuse Holder leave CLOSE Use a multimeter to verify the AC current existence 3 Close by swinging up and pushing in the fuse holder until there s a click ...

Page 85: ...Initial Energization 85 Three 3 secondary voltage monitoring fuses are included in the orange envelope mounted on the back of the ClearSky PLUS Control Panel swing door ...

Page 86: ...ng In Lock the Swing Panels At this point the Initial Energization process has been completed Both ClearSky control Panel and ClearSky Plus in rush Mitigation Panel are ready for the operation process in the next section You may now close the swing panel and lock them in place as shown in the picture below ...

Page 87: ...PLUS set forth at the completion of the Initial Energization we strongly recommend performing the Initial Energization before proceeding The following steps will allow interconnection voltage to flow through the myPV ClearSky from the Utility side through the internal MV VFI breakers to the Solar side and to any electrically equipment that is in a CLOSED circuit condition Improper PPE tools and or...

Page 88: ...se command from the Protection Relay For the following Operational testing steps please verify that the Mode Selection Switch and Protection Relay indicate the following status 1 Verify the Model Selection Switch is in the REPAIR SERVICE MODE position 2 Verify the Protection Relay indicates it is TRIPPED Red Indication next to TRIP 3 Verify the TRIP button s BREAKER OPEN Green Indication is illumi...

Page 89: ... While still in REPAIR SERVICE MODE the MV VFI Breakers may be cycled OPEN and CLOSE independent of any protection logic or recloser settings NOTE Protection Logic can still cause a TRIP event e g If the MV Breakers are manually CLOSED and there is no grid voltage the Protection Relay may still TRIP the MV Breakers on an under voltage condition The following steps demonstrate manual operation of t...

Page 90: ...REAKER CLOSED Red indicator will remain illuminated so long as any one MV VFI Breaker is still in the CLOSED position Numbered Illustration of Protective Relay Indicators Testing 1 Phase Operation In support of IEEE 1547 loss of phase testing requirement the myPV ClearSky has been designed to support pushbutton single phase testing capabilities Single phase testing is a special mode that must be e...

Page 91: ...or full IEEE testing compliance At any time a single phase is OPEN rotating the Selector Mode Switch to AUTOMATIC will enable protection logic and force a 3 phase TRIP condition The SPD TEST button will automatically reset to DISABLED after 50 minutes from the time it is first enabled A single phase that is TRIPPED by pressing and of the A PHASE B PHASE or C PHASE buttons may be CLOSED by simply p...

Page 92: ... 3 phase TRIP 2 Press and hold the TARGET RESET button until 3 the TRIP Red indicator is no longer illuminated 4 Firmly press the CLOSE button the MV Breakers should CLOSE 5 The CLOSE button s BREAKER CLOSED Red indicator should now be illuminated 6 The three 3 individual A PHASE B PHASE and C PHASE Red indicators should now also be illuminated The myPV ClearSky may be left in this condition indef...

Page 93: ...Operational Testing 93 Numbered Illustration of Protective Relay Indicators ...

Page 94: ...displays the 751 Relay and 735 status Pre Commercial Energization Check Before Energization the ClearSky Plus panel should be connected to the grid power with Grid voltage connected the rest of the systems are open waiting for the close procedure The LED indicator should reflect the connection with the red LED on the Grid Voltage on the RVC Panel ...

Page 95: ...n the Interconnection box As soon as Close is pressed the Pre Energizing LEDs on the In Rush Mitigation panel shall respond immediately to the Close command Therefore the Pre Energization LED illuminates shows the system has entered the Pre Energization phase The Closing Sequence On the RVC Panel the Grid Voltage has indicated a closed in status for the transformer s energization While rest of the...

Page 96: ...to the solar site and the transformer After the Close button is pressed the pre energizing sequence is finishing in the next 10 second and the RVC transformer is energizing and start to run in parallel with the solar site and the grid power Both the Low Voltage side and the Medium Voltage side ...

Page 97: ...Operational Testing 97 switches are closed The LEDs show the system is in Parallel and the Pre Energization has been dropped to the open status Output Ready RVC LED Illumination status for Export Ready ...

Page 98: ...uence is completed with the low voltage switch open The Export Ready LED turns red and the site starts to generate power and feed to the grid During the operation the Export ready light will be on until the Trip command is given to the ClearSkyPLUS on the SEL 751 Relay ...

Page 99: ...nspection Frequency Inspection Description Every Yrs Outage Metal Corrosion Inspect the external and internal metal surfaces for signs of corrosion If corrosion is found brush clean affected areas to remove oxidation and debris prime and paint with an outdoor rated paint specifically for metal steel surfaces 1 UPS Battery Verify the UPS battery indicator lights are not red If any of the UPS indica...

Page 100: ...ces replaced by a qualified party If poor un grounded grounds should be repaired and tested If unsealed conduits should be re sealed 2 Solar MV Terminations Following isolation and LOTO the Solar side MV Termination cabinet should be opened to 1 Inspect that it is free of debris water animals or other contamination 2 MV elbows are firmly seated 3 MV conductors are free of defects 4 All grounds and...

Page 101: ...parts Spare Parts The myPV ClearSky PLUS is designed with high quality industrial grade components that are intended to provide reliable operation throughout the commercial operating lifespan of your facility Having a complement of spare parts on hand however can prevent unnecessary prolonged downtimes Recommended Spare Parts List ...

Page 102: ...Spare Parts 102 ...

Page 103: ...Spare Parts 103 ...

Page 104: ...screw terminal tightening torques Torque Spec COURSE THREAD TORQUE FINE THREAD TORQUE 1 1 4 20 49 0 in lb5 5 N m 1 4 20 55 0 in lb6 2 N m 5 16 18 101 0 in lb11 4 N m 5 16 18 112 0 in lb12 7 N m 3 8 16 180 0 in lb20 3 N m 3 8 16 204 0 in lb23 0 N m 7 16 14 24 0 Ft lb32 5 N m 7 16 14 27 0 Ft lb36 6 N m 1 2 13 36 5 Ft lb49 5 N m 1 2 13 41 0 Ft lb55 6 N m 9 16 12 53 0 Ft lb71 9 N m 9 16 12 59 0 Ft lb8...

Page 105: ...ue to a CT wire lead being terminated improperly in the Utility MV Termination Cabinet MV installation crews typically disconnect the wire leads while installing the CTs over the MV conductors When reconnecting the wire leads the electrical connections may be landed on the wire insulation instead of the conductor opening the CT s current path See image of CT wire lead insulation deformed by improp...

Page 106: ... RESET until the Red TRIP indicator is no longer illuminated TRIP Indicator NOT Illuminated MV Breaker TRIP on CLOSE If the MV Breaker immediately TRIPs following a CLOSE the Protection Relay is commanding it to TRIP due to a protection element or logic driven fault detection Consult the Protection Relays event files to determine the cause of the TRIP command Have a question Contact Us We are Here...

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