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MYPV ClearSky Plus User Manual

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myPV ClearSky™ Plus User Manual
V2.3
Welcome
This interactive manual guides new and experienced users through the ClearSky PLUS
modular interconnection with inrush mitigation.
Additional support is available 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
Spare Parts
Torque Schedules
Troubleshooting
myPV ClearSky™ Plus User Manual
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Summary of Contents for MYPV ClearSky Plus

  • Page 1 ClearSky™ Plus User Manual V2.3 Welcome This interactive manual guides new and experienced users through the ClearSky PLUS modular interconnection with inrush mitigation. Additional support is available 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...
  • Page 2 Equipment Build Standards All myPV ClearSky PLUS equipment is built with quality 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...

  • Page 3: Standard Features

    ClearSky PLUS - 2021 Version Standard Features The myPV ClearSky PLUS product line is designed to provide a self-contained and modularized solution for both distribution and transmission interconnected generation facilities operating up to 25kV with a maximum continuous current of 600A (per MV feeder).
  • Page 4 Typical battery backup times exceed 4 hours after the loss of grid power. IEEE 386 MV Interfaces All configurations of the myPV ClearSky PLUS use industry standard bushing well and inserts MV interfaces. 200A load-break or 600A dead break interfaces may be specified at the time of order based on facility amperage requirements.

  • Page 5: Standard Options

    Standard Options The myPV ClearSky PLUS product line provides standard options to upgrade and add components in a manner that supports the most frequently requested Customer requests. Standard Options Include: Revenue Grade Metering Upgrades [DEFAULT] Basic PQ waveform recording (15th harmonic, 16 samples/cycle, 15 cycle...
  • Page 6 Contact us for specifics. myPV IQ™ - Remote Interface [DEFAULT] Installed and licensed for monitoring and control of 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.
  • Page 7 Metering and Relaying CTs are now clearly labeled for both phase and orientation in the event they are unmounted during MV cable management The myPV IQ™ - Remote Interface and integrated cellular modem have been added to the standard product offering to support remote commissioning and troubleshooting by Customers, Customer assign Engineering resources, and Solar- Ops support staff.

  • Page 8: Technical Documents

    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.
  • Page 9 Product Line Specifications The myPV ClearSky™ PLUS product line is available in two (2) frame sizes that are determined by maximum 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.
  • Page 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. Resources...

  • Page 11: Product Photos

    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. South - Front Side SE Corner - Front Side / Pre-Insertion...
  • Page 12 East - Pre-Insertion Side Potential NE Corner - Pre-Insertion Side / Back Transformers (PTs) Side West - Terminations Side (Doors Open) NW Corner - Back Side / Terminations Side Resources...
  • Page 13 West - Terminations Side LV Cabinet & Cable Entry West - Terminations Side Current Transformers (CTs) West - Terminations Side LV Cabinet Front - Doors Open Network Entry Resources...
  • Page 14 South - Front Side RVC Controller, East - Pre-Insertion Side Metering & Relay Cabinet East - Pre-Insertion Side MV Fuse East - Pre-Insertion Side Transformer HoldersFuses & Silencers Shipped w/ (Side) Equipment Resources...
  • Page 15 East - Pre-Insertion Side Transformer MV North - Back Side VFI Breakers West - Terminations Sid MV Cabinet & Cable Entry West - Terminations Side Resources...
  • Page 16 West - Terminations Side LV Cabinet West - Terminations Side LV Cabinet Terminal Blocks (#2 AWG Cu) Resources...
  • Page 17 NW Corner - Terminations Side / Front Side Frame Size by Voltage Class myPV ClearSky™ PLUS is available in two (2) frame sizes 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.
  • Page 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: Resources...
  • Page 19 Potential Transformers (PTs) and Current Transformers (CTs) are devices used to measure voltage and current respectively. The myPV ClearSky PLUS has a single set of three (3) revenue grade PTs that are shared for metering and protection relaying functions. The myPV ClearSky PLUS has two sets of three (3) CTs however. The first set is dedicated to review grade metering, while the second set is dedicated to protective relaying.
  • Page 20 The selection of instrument transformers is specific to the application, the interconnection and facility electrical characteristics, and also an Engineer’s preference. For the myPV ClearSky™ PLUS, we have assembled the following table of standard part numbers for PTs and CTs to use, unless otherwise specified buy the Customer:...
  • Page 21 Resources...
  • Page 22 Resources...

  • Page 23: Theory Of Operation

    Theory of Operation The myPV ClearSky™ PLUS provides all of the interconnection functionality of the myPV ClearSky Interconnection, as well as a fully automated inrush mitigation solution. Inrush Current & Rapid Voltage Change (RVC) Utility distribution feeders radiate out from sub-stations, delivering power to customers (loads).
  • Page 24 Due to its size, there is no 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.
  • Page 25 pre-insertion transformer limits the flow of current, preventing the rapid voltage change event. Facility is Pre-Energized Via the Pre-Insertion Transformer’s LV (Secondary) 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.

  • Page 26: Design Considerations

    Design Considerations Failing to plan is planning to fail. Although the myPV ClearSky™ PLUS is very simple to design for and incorporate into your project design, there are aspects of the equipment that should be considered in the initial design to avoid unnecessary costs and difficulties during construction.
  • Page 27 ClearSky PLUS Located at Equipment Pad Next to First ISU Orientation & 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.
  • Page 28 ClearSky PLUS 25kV - Termination Cabinet Door Swing Design Considerations...
  • Page 29 ClearSky™ PLUS Termination MV Cabinet Floor of Poured Equipment Pad Foundation Type The myPV ClearSky™ PLUS requires a smooth, flat, horizontal surface to be mounted on that is appropriately designed to support its weight and footprint. Common foundations include, but are not limited to:...

  • Page 30: Electrical Isolation

    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 functions. The pre-insertion transformer is wound with tertiary single-phase 120V control power winding, the myPV ClearSky™ PLUS is self- powered.
  • Page 31 Both the power supply and UPS are wired to the protection relay alarming contacts to support fail-safe tripping logic. Network Cable Entry On the inside wall of the myPV ClearSky PLUS’s LV Termination Cabinet, a dedicated wire gland has been installed to allow for network cable passthrough to the Control Cabinet network switch.
  • Page 32 Protection Relay Settings The myPV ClearSky™ PLUS is designed to provide a set of features that support automated inrush mitigation switching, witness testing requirements, maintenance modes, and protection requirements. Template Relay Settings File The SEL-751 Protection Relay, and the myPV ClearSky PLUS’s intended operational behaviors rely on logic programmed into the relay’s RDB settings file.
  • Page 33 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 support TRIP on-alarm- condition for the following conditions and time delays: On loss-of-control-power, when the N.O. power supply digital output OPENs, the Protection Relay will TRIP after 30 seconds.
  • Page 34 Automated Inrush Mitigation Switching The myPV ClearSky PLUS routes all OPEN/TRIP and CLOSE commands through the Protection Relay (SEL-751). The SEL-751 may be interacted with normally though the push button interface, the SEL AcSELerator software, or via SCADA command. The SEL-751 does not immediately CLOSE when commanded, instead it coordinates the CLOSE event with a secondary logic device called the “RVC Controller”.
  • Page 35 7. MV Breaker controller CLOSEs MV Breaker (52) 8. SEL-751 verifies MV Breaker CLOSE via AUX contact (52a) 9. When the RVC Controller is signaled. By the SEL-751 that the MV Breaker has CLOSEd, the RVC Controller delays 2.5s before commanding the LV Relay Contactor to OPEN 10.
  • Page 36 Single-Phase TRIP Support The myPV ClearSky PLUS’s SEL-751 is pre-programmed to support both 3-Phase and 1-Phase TRIP support functionality. I-Phase TRIP support may be used by commissioning staff validate proper inverter anti- islanding 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.
  • Page 37 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.
  • Page 38 Equipment is Wrapped & Palletized Typically Equipment Delivery Receiving...

  • Page 39: Lifting & Handling

    Four (4) SS Strap Clamps Lifting & Handling All myPV ClearSky PLUS frame sizes (with options) are less than 6,500 Lb (2,949 kg), and may be safely unloaded, lifted, and set using a forklift or telehandler. The myPV ClearSky PLUS has two (2) fork channels integrated into the device’s structural base to facilitate safe lifting.
  • Page 40 Two (2) Fork 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 Securing The myPV ClearSky™ PLUS is designed to be secured to the foundation using four (4) SS Strap Clamps (included) and secured with two (2) SS 1/2” diameter threaded stud with nut and washer set (8 sets total, not included).
  • Page 42 MV Cable Support Removal For shipping only, 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 Zip Tie Removal For shipping, zip ties are installed around the three (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.
  • Page 44 (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. Unassembled Fuse Mounting Hardware...
  • Page 45 Top Fuse Mounting Hardware Three (3) MV Fuses Fully Assembled & Installed Receiving...
  • Page 46 The myPV ClearSky™ PLUS Interconnection is designed to electrically terminate in the same manner as a pad-mounted transformer. Here’s what you can expect. Overview The myPV ClearSky PLUS is designed to be very easy to install, requiring medium voltage (MV) separable connectors, low voltage (LV) lugged terminations, and ground- ring terminations.
  • Page 47 MV Termination Cabinet 200A Bushing Wells Capped for Shipping200A Inserts Shipped w/ Device (Not Shown) Electrical Terminations...
  • Page 48 LV Termination Cabinet Secondary Voltage Connections ForLugged #2 AWG Cu Middle-Right Electrical Terminations...
  • Page 49 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 myPV ClearSky PLUS and the first ISU’s secondary connections...
  • Page 50 MV Terminations All metering and protection relay current measurements are measured from the Utility MV Conductors entering the MV Termination Cabinet. To ensure the current transformers (CTs) are easily serviceable, all six (6) CTs are installed outside the central switching cabinet. The CTs are bolted to slotted strut to allow for horizontal positioning, and even temporary removal to accommodate MV conductor pulls and routing.
  • Page 51 LV Terminations Electrically 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 LV Termination Cabinet Electrical Terminations...

  • Page 53: Conduit Entries

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

  • Page 54: Network Integration

    ClearSky™ PLUS is intended to be a first class “Connected Plant” device. Overview The myPV ClearSky PLUS may be added to the local area (LAN) Facility network via an integrated network switch. 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.

  • Page 55: Media Routing

    Media Routing Communications conduits should be run in parallel to the low voltage (LV) cable conduits, and located inside the LV Termination Cabinet. A dedicated large-bore (1-1/2” Diameter) wire gland is located on the right side wall of the LV Termination Cabinet, labeled “NETWORK” to allow media routing between termination cabinet and the Control Cabinet.
  • Page 56 Network Integration...
  • Page 57 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. Standard 8-Port Switch Optional MM Fiber Switch *Other Options Available Network Integration...

  • Page 58: Device Communications

    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: Network Integration...
  • Page 59 MODBUS Map Similar to the SEL-735 Meter 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: Pre-Energization Checks

    It is strongly recommend that a LOTO’d air-gap isolation plan be established on both the Utility side and Solar side of the myPV ClearSky PLUS device, using air-gap visible OPEN devices that are OUTSIDE the myPV ClearSky PLUS device.

  • Page 61: Grounding Verification

    Grounding Verification It is important that the myPV ClearSky PLUS be properly grounded to prevent any transient voltages from not having a safe path to ground. Due to the myPV ClearSky PLUS’s location on an equipment pad and grounding ring, Solar-Ops recommends the maximum ohmic resistance between the device grounding rod and the associated ground will be <...
  • Page 62 All Six (6) MV Elbows Fully Seated MV Insert “Yellow” Color Ring Exposed When Properly Installed, Color Should Not Show Pre-Energization Checks...
  • Page 63 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. All three (3) breaker’s positions should be visually verified to ensure they are in the OPEN (indicate GREEN) position.
  • Page 64 View of Center Switching Cabinet Through Wire-Glass Window Pre-Energization Checks...
  • Page 65 CT Orientation & Wiring Verification Metering & protection relaying functions require proper orientation and location of all six (6) CTs. A flipped CT will report current for that phase importing rather than exporting. A CT located on the wrong phase will not properly align with voltage for the same phase and provide inaccurate measurements.
  • Page 66 PT 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. Example of Fuse Indicator “Extended”, Indicating a Fuse Failure Pre-Energization Checks...
  • Page 67 View of Three (3) PT Fuses Through Wire-Glass Window Pre-Energization Checks...
  • Page 68 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. View of the front side of the ClearSky PLUS.
  • Page 69 ClearSky (Right) Control Panel Preparation Prior to energization, preparation of the Control Panel is intended to prevent damage to the electrical components due to out-of-range source voltages and also stages the Control Panel for commissioning steps that will be taken in the next section Initial Energization.
  • Page 70 Control Panel Verification Locations Reference the 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 Pre-Energization Checks...
  • Page 71 Finally, switch the ClearSky Control Panel Mode Selector into 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 Pre-Energization Checks...
  • Page 72 ClearSky PLUS (Left) Control Panel Preparation The ClearSky PLUS Control Panel layout is presented in the figure to the right with number callouts for the circuit breakers and fuses. 1. OPEN (by pulling the top and swinging down) the AC Source Fuse Holder, leave...
  • Page 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. Pre-Energization Checks...
  • Page 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 Pre-Energization Checks...

  • Page 75: Initial Energization

    Pre-Energization Checks. If you have not yet performed the Pre-Energization Checks, or have taken any actions that altered the as-left conditions of the myPV ClearSky PLUS set forth at the completion of the Pre-Energization Checks, we strongly recommend performing the Pre-Energization Checks before proceeding.
  • Page 76 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 24V DC Capable Readings) 2.
  • Page 77 ClearSky Plus Cabinet 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. View of the front side of the ClearSky PLUS.
  • Page 78 2. Phase-C identification from Interconnection, through the test-switches, to the Meter & Protective Relay For the following steps, the myPV ClearSky™ PLUS’s Control Panel door will need to be opened and the dead front swung open to allow for AC power measures.
  • Page 79 Control Power Commissioning Verify proper AC and DC voltages prior to energizing controls equipment. Addition Commissioning Verifications: 1. Proper Power Supply Operation Commissioning Steps: 1. CLOSE the 10A Fuse 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.
  • Page 80 Controls Energization Energizing the Control Panel will also energize the Meter and Protective Relay, enabling addition commissioning verifications. Addition Commissioning Verifications: 1. Proper Battery UPS Energization 2. Networking & SCADA Equipment Energization 3. Metering & Protection Relay Energization Commissioning Steps: 1.
  • Page 81 ◦ Hub-E8 - Network 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 ◦...
  • Page 82 Phase-A & Phase-B Energization With phase-C previously energized, and the Controls Cabinet powered, phase-A and phase-B may now be energized. 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.
  • Page 83 2. Instruct the MV contractor to energize phase-B, as it is labeled at the interconnection Verify phase-B voltage by using a Multimeter (set to AC RMS) to verify the presence of ~120V AC voltage (±10%, 108 - 132V) at locations (B) 601 If ~120V is present, CLOSE the 10A fuse holder associated with 601NOTE: The corresponding L-N interconnection voltage for Phase-B should also be read on both the SEL-735 Meter and SEL-751 Protection Relay...
  • Page 84 ClearSky Plus Control Panel (Left) Setup ClearSky PLUS Control Panel Verification Locations The ClearSky PLUS Control Panel layout is presented in the figure to the left with the number of callouts for the circuit breakers and fuses. During the Pre-Energization checks, the callout circuit breakers and fuses were open.
  • Page 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 Initial Energization...
  • Page 86 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: Operational Testing

    If you have not yet performed the Initial Energization, or have taken any actions that altered the as-left conditions of the myPV ClearSky PLUS set forth at the completion of the Initial Energization, we strongly recommend performing the Initial Energization before proceeding.
  • Page 88 Initial Breaker Position During the myPV ClearSky’s factory integration testing, the three (3) medium voltage (MV) MV) VFI breakers were left in the OPEN position by initiating a 3-Phase 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.
  • Page 89 Manual 3-Phase Operation 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.
  • Page 90 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 enabled by the Commissioning staff, and is only available when the Mode Selector Switch is in REPAIR SERVICE MODE.
  • Page 91 PHASE buttons may be CLOSED by simply pressing the same button again (like a toggle switch) When a single-phase is TRIPPED/ OPENED, the myPV ClearSky’s PT voltage reference is still sensing grid voltage as the PT taps are located on the Utility side of...
  • Page 92 Commercial Operation Following testing, take the following steps, once you are ready to place the myPV ClearSky™ into normal commercial operation. Commercial Operation Settings: 1. Rotate the Mode Selector Switch to AUTOMATIC (if any phase was OPEN the will cause a 3-phase TRIP) 2.
  • Page 93 Numbered Illustration of Protective Relay Indicators Operational Testing...
  • Page 94 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 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 LEDs has shown open status. RVC Panel LED illumination status while “Close” button is pressed. After ensuring that the red switch is in the automatic mode, press on the close button located on the SEL-751, the feeder protection relay in the Interconnection box.
  • Page 96 Low/ Medium Voltage “In Parallel” RVC Panel operating Parallel comparing 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.
  • Page 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 Operational Testing...
  • Page 98 After another 3 -4 seconds, the In-Parallel sequence 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”...
  • Page 99 Facility. Recommended Maintenance Schedule The myPV ClearSky PLUS is designed to be maintenance free, and requires no regular consumables or maintenance service under normal operational conditions. The following table established recommended inspection frequency for preventative maintenance scheduling.
  • Page 100 Every Description Inspection Outage (Yrs) Following isolation and LOTO, the Utility 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 fee of defects 4. All grounds and bleed wires are intact 5.

  • Page 101: Spare 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.
  • Page 102 Spare Parts...
  • Page 103 Spare Parts...
  • Page 104 Torque Schedules The myPV ClearSky™ Interconnection was designed to be mechanically assembled using the following torque schedules. Torquing Values For all bolted connections, unless otherwise specified, refers to the chart below. For electrical components, see component manufacturer’s data for all screw terminal tightening torques.

  • Page 105: Troubleshooting

    Troubleshooting Eliminate the most common myPV ClearSky™ Interconnection operational issues quickly and safely. Missing Single-Phase Current Whether in the SLE-735 Power Quality Meter, or the SLE-751 Protection Relay, a zero value (0.0A reading) is most commonly due to a CT wire lead being terminated improperly in the Utility MV Termination Cabinet.
  • Page 106 Following a TRIP event, the Protection Relay will not allow a CLOSE command if the TRIP has net been cleared. An uncleared TRIP event will cause the Red TRIP indicator to illuminate. To clear the TRIP event, press the TARGET RESET until the Red TRIP indicator is no longer illuminated.

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