Sungrow MVS6840-LV System Manual
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Sungrow MVS6840-LV System Manual

Sungrow MVS6840-LV System Manual

Mv station
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System Manual
MV Station
MVS6400–LV/MVS6840–LV/MVS8850–LV/MVS8960–LV
MVS6400–LV/MVS6840–LV/MVS8850–
MV StationSystem
LV/MVS8960–LV
LV-SEN-Ver15-202310M-H-002652
MVS6400_6840_8850_8960-LV-SEN-Ver15-202310

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Summary of Contents for Sungrow MVS6840-LV

  • Page 1 System Manual MV Station MVS6400–LV/MVS6840–LV/MVS8850–LV/MVS8960–LV MVS6400–LV/MVS6840–LV/MVS8850– MV StationSystem LV/MVS8960–LV ManualMVS6400_6840_8850_8960- LV-SEN-Ver15-202310M-H-002652 MVS6400_6840_8850_8960-LV-SEN-Ver15-202310...

  • Page 3: Table Of Contents

    Contents 1 About This Manual ...................1 1.1 Validity......................1 1.2 Demonstration of the Model................1 1.3 Target_Group ....................1 1.4 How to Use This Manual .................2 1.5 Symbols Explanation ..................2 2 Safety Instructions ....................4 2.1 General Safety Rules..................4 2.2 Ground Fault Protection ..................5 2.3 Live Line Measurement...................5 2.4 Measuring Instrument ..................5 2.5 Voltage-free Operations ..................6...
  • Page 4 4.1 Identifying the MV Station................20 4.2 Checking for Transport Damages..............20 4.3 Storage......................20 5 Mechanical Installation ..................22 5.1 Transport .....................22 5.2 Hoisting the MV Station.................23 5.2.1 Safety Precautions ................23 5.2.2 Hoisting....................24 5.2.3 Fastening of Connectors..............25 5.3 Foundation....................26 5.3.1 Selection of Installation Site ..............26 5.3.2 Recommended Foundation Construction Plan........27 5.3.3 Securing the MV Station(optional) ............27 5.4 Installation Verification ..................29...
  • Page 5 7.1.2 MV Switchgear..................48 7.1.3 MV Transformer ..................49 7.1.4 LV Cabinet ..................51 7.2 Power-on Steps....................51 8 Troubleshooting ....................52 9 Routine Maintenance ..................54 9.1 Safety Instructions ..................54 9.2 Maintenance ....................55 9.2.1 Introduction ..................55 9.2.2 Maintenance Interval ................55 9.3 Checking and Cleaning the Filter ..............57 9.3.1 Checking and Cleaning the Air Inlets ............58 9.3.2 Checking and Cleaning Air inlets of the Heat Exchanger ......58 9.4 Oil Drain ......................59...

  • Page 7: About This Manual

    About This Manual Validity This manual is intended for the following product: • MVS6400-LV • MVS6840-LV • MVS8850-LV • MVS8960-LV Hereinafter it will be referred to as " MV Station" unless otherwise specified. Demonstration of the Model Rated power Model Devices can be connected 6400 kVA@40℃...

  • Page 8: How To Use This Manual

    All rights reserved including the pictures, symbols, and identifiers used in this manual. Any reproduction or disclosure, even partially, of the contents of this manual is strictly prohibited without prior written authorization of SUNGROW. Symbols Explanation This manual contains important safety and operational instructions that must be accurately understood and respected during the installation and maintenance of the equipment.
  • Page 9 System Manual 1 About This Manual NOTE indicates additional information, emphasized contents or tips to help you solve problems or save time. The symbols below may be found on the electrical parts of the product. Make sure to read the following symbols and fully understand them before installing the equipment. Symbol Explanation Lethal voltage inside! Do not touch!

  • Page 10: Safety Instructions

    Safety Instructions General Safety Rules Touching the terminals or contactors connected to the grid may lead to electric shock! • Do not touch the terminals or conductors connected to the grid. • Respect all safety instructions on the grid connection. Lethal voltages are present inside the device! •...

  • Page 11: Ground Fault Protection

    System Manual 2 Safety Instructions The installation, electrical connection, commissioning, maintenance, and troubleshooting must be carried out by professional electrical technicians conforming to local codes. Before performing operations, operators should have read this manual completely and mastered the safety issues related to the operation.

  • Page 12: Voltage-Free Operations

    2 Safety Instructions System Manual • The instrumentfor measuring the electrical parameters should be a high-quality instrument with sufficient measuring range. • Make sure the connection and use of the instrument are correct to avoid arc and other dangerous situations. •...

  • Page 13: Safety Warning Signs

    System Manual 2 Safety Instructions Safety Warning Signs During transport, installation, maintenance, and troubleshooting of the MV Station, keep unauthorized persons away. • Post warning signs near the MV Station upstream and downstream switches to prevent inadvertent connection. • Place necessary warning signs or barriers near the on-site operation areas. Daily Operation and Maintenance Make sure the doors of the MV Station are closed and locked during daily operation to prevent internal devices from damages caused by rain or rodents.

  • Page 14: Others

    All the descriptions in this manual are for the standard MV Station. Please inform us in the purchase order if you have specific requirements. The actual product you receive may differ. This manual may not cover all possible situations. Should a specific problem not explained in this manual occur, please contact Sungrow.

  • Page 15: Product Description

    Product Description System Overview The MV Station is mainly applied to large-and-medium PV power station. The MV Station can meet the modular design and quick installation requirements of the large-and-medium PV power station and can ensure the long-term, reliable, and safe power generation compliant with the grid.

  • Page 16: External Design

    3 Product Description System Manual External Design 3.2.1 MV Station Views Version 1 figure 3-1 Appearence of the MVS8850_8960–LV figure 3-2 Appearence of the MVS6400_6840–LV...
  • Page 17 System Manual 3 Product Description Version 2 figure 3-3 Appearence of the MVS8850_8960–LV figure 3-4 Appearence of the MVS6400_6840–LV This manual uses the MVS8850-LV version 1 as an example.

  • Page 18: Composition

    3 Product Description System Manual 3.2.2 Composition Description Name Including low voltage connection area, low voltage cable LV room entries, etc. It can be connected to the PV grid- connected inverters. Including a MV transformer. Transformer room The MV transformer converts the inverter output low- voltage into grid-compatible medium-voltage.

  • Page 19: Internal Design

    System Manual 3 Product Description Internal Design 3.3.1 Internal Composition Name LV cabinet MV Transformer MV switchgear Communication box and power distribution cabinet 3.3.2 Cable Entries Top View...

  • Page 20: Internal Devices

    3 Product Description System Manual Description Name All LV side cables connecting the MV Station go LV side cable entries inside through these entries. All MV side cables connecting the MV Station go MV side cable inside through these entries. entries Communication &...
  • Page 21 System Manual 3 Product Description Take MVS8850 low-voltage cabinet as an example, figure (1) shows the left side layout, figure (2) shows the front layout, and figure (3) shows the right side layout. Name Description Control the opening and closing of the main switch Lock Disconnector Connect/disconnect the connection to the inverter...
  • Page 22 3 Product Description System Manual Figure Description Name when oil level of the MV transformer oil tank is Oil filling valve low, open the valve for oil filling. The valve automatically releases when the oil Pressure Relief Valve pressure inside the oil tank reaches 55kPa. The MV transformer will stop operating if the oil level falls below the lowest scale on the oil level indicator or below the oil level scale required for...
  • Page 23 System Manual 3 Product Description Figure Description Name The tap changer has five tap positions: 1, 2 , 3, Tap changer 4 , 5. For more details, refer to "7.1.3 MV Transformer" When a fault occurs in the transformer, the oil in the oil tank will be decomposed to generate gas, and the gas will rise and enter the gas relay.
  • Page 24 3 Product Description System Manual 3.3.3.4 Power Distribution Room The power distribution room integrates a communication box and a power distribution cabinet inside. Communication Box The exterior appearance and internal components of the communication box are shown in figure below. The figure above is indicative only, and actual product may differ.
  • Page 25 System Manual 3 Product Description The figure above is indicative only, and actual product may differ. Description Power distribution area Maintenance switch QSD1...

  • Page 26: Identify And Store The Mv Station

    Therefore, once you receive the MV Station, a detailed inspection is necessary. If any damage is detected, contact the forwarding company or Sungrow immediately. Examine the contents of the shipment to check the scope of delivery for completeness.
  • Page 27 System Manual 4 Identify and Store the MV Station • If the MV Station has to be stored outdoors, elevate the MV Station base according to the geological and ambient conditions. • When the ambient temperature is too low, heat the MV Station internal devices. Temperature: -40℃~+70℃.

  • Page 28: Mechanical Installation

    Mechanical Installation Respect all local standards and requirements during mechanical installation. Transport All devices are installed inside the MV Station before delivery. The MV Station should be transported as a whole. Transport the MV Station by a crane with sufficient load capacity. The MV Station is delivered to the user by the forwarding company.

  • Page 29: Hoisting The Mv Station

    System Manual 5 Mechanical Installation • Place the MV Station carefully and gently. Do not pull or push the MV Station on any surface. • The place should be firm and flat with good drainage and no obstacles or outshoots. The MV Station should be supported by the four feet.

  • Page 30: Hoisting

    5 Mechanical Installation System Manual figure 5-1 Hoisting the MV Station 5.2.2 Hoisting During the whole hoisting process, please observe the following rules: • Hoist the MV Station in a vertical manner. Do not drag or drop the MV Station on any surface.

  • Page 31: Fastening Of Connectors

    System Manual 5 Mechanical Installation figure 5-2 Hoisting from top fittings table 5-1 The Substation Hoisting Parameters Item Requirement Steel Length(L) ＞6.5 m Steel Rope Qty. 4 pieces, the load of a single steel is not less than 30T. 5.2.3 Fastening of Connectors Use slings with hooks or U-hooks to hoist the MV Station.

  • Page 32: Foundation

    National and local safety rules should be observed at all times. • Violating relevant safety rules may void pertinent warranty claims from Sungrow. Foundation 5.3.1 Selection of Installation Site When selecting the installation site, consider the following requirements at least: •...

  • Page 33: Recommended Foundation Construction Plan

    System Manual 5 Mechanical Installation • Keep at least 50 meters away from residential areas to avoid noise pollution. • The ground at the installation site must be compacted enough. Relative compaction of the ground should be equal to or greater than 98%. Otherwise, take proper methods to strengthen the ground.
  • Page 34 5 Mechanical Installation System Manual Preparing Installation Tools The following tools may be used in installing the L-shape angle steel: Name Resource Beyond the scope of delivery Marker φ22 percussion drill Beyond the scope of delivery Angle steel In the scope of delivery M16×150 expansion Beyond the scope of delivery bolts...

  • Page 35: Installation Verification

    System Manual 5 Mechanical Installation Installation Verification • Bolts and nuts are tightened. • The container is in good contact with and evenly supported by the bases underneath. • All container doors can be smoothly opened and closed. Clearance Requirement On site, MV Station works together with the inverter.
  • Page 36 5 Mechanical Installation System Manual...

  • Page 37: Electrical Connection

    Electrical Connection Safety Instructions 6.1.1 Generals Rules High voltage! Electrical hazards! • Do not touch the live components of the device. • Make sure the MV Station are voltage-free before installation. • Never put flammable materials in the vicinity of the MV Station. If a ground fault occurs in the PV system, some parts that were voltage-free before may contain lethal voltage.
  • Page 38 Strictly follow all the instructions when connecting the cables. The installation and design of the MV Station must fulfill national and local standards and regulations. Sungrow should hold no liability for the MV Station or system fault caused by ignorance of the description in this manual.

  • Page 39: Five Safety Rules

    System Manual 6 Electrical Connection Select optical fibers as the external communication cable to lower the signal interference. 6.1.2 Five Safety Rules During electrical connections and other operations on the inside device, observe the following Five Safety Rules: • Disconnect all the external connections and disconnect the MV Station internal power supply •...

  • Page 40: Preparation Before Cable Connections

    6 Electrical Connection System Manual Item Name Recommended specifications Communication port Grounding point Preparation before Cable Connections 6.3.1 Installation Tools Installation tools include but are not limited to the following recommended ones, and other auxiliary tools or components can be used on site when necessary.

  • Page 41: Opening The Door

    System Manual 6 Electrical Connection 6.3.2 Opening the Door Opening the Door Lock Opening the Enclosure Insert the key. Turn the handle counterclockwise to unlock the door. 6.3.3 Checking the Cables Check to ensure the intactness and insulation of all cables before electrical connection.

  • Page 42: During Connection

    6 Electrical Connection System Manual 6.3.4 During Connection • Do not pull the cables hard during connection. • Make sure there is enough wire bending space for all connection cables. • Take proper methods to reduce the stress of cables. •...

  • Page 43: Side Connection

    System Manual 6 Electrical Connection It is recommended that two points of the MV Station should be connected to the ground system of the PV plant. The MV Station needs to be grounded on site. The following operations should also be conducted on site: Measure the electrical conductivity between the device ground terminals and the total equipotential connection copper bar to ensure the effectiveness of the internal ground connection.
  • Page 44 6 Electrical Connection System Manual Tighten the cable lug with relevant tools. Crimp it at least twice. Cable protectors are advisable in the cable crosses if the multi-core cables are used. step 6 Connect the cable. Select bolts matching with the cable lug. Attach the cable lug to the connection copper bar.
  • Page 45 System Manual 6 Electrical Connection figure 6-2 Double Side Copper Wire Connection Name Name Copper bus Spring washer Cable lug Flat washer Bolt • If aluminum wire is selected, a copper-aluminum adapter terminal is required, as shown below: figure 6-3 Single Side Aluminum Wire Connection Name Name Copper bus...
  • Page 46 6 Electrical Connection System Manual figure 6-4 Double Side Aluminum Wire Connection Name Name Copper bus Spring washer Copper-aluminum Flat washer adapter terminal Bolt Fasten the bolts with screwdriver or spanner. For the M12x40 bolts, the fastening torque is 60~70N.m. When the upstream inverter is SG320HX, there are four ways to connect the LV side cables.
  • Page 47 System Manual 6 Electrical Connection Name Wiring copper bar Low voltage incoming line sealing plate Tower type protective coil Cable clamp Single core cable Container base Single core double splicing cable U-shaped cable clamp Three core cable Three core dual splicing cable •...

  • Page 48: Mv Side Connection

    6 Electrical Connection System Manual • Long bolts may affect the insulation and may cause short circuit. • Remove the heat-shrink tubing between the cable lug and the copper bar if necessary. Poor contact or over-heating may follow if otherwise. •...

  • Page 49: Communication Connection

    System Manual 6 Electrical Connection 6.4.3.2 Procedure step 1 Lead the cable from external device through the cable entry on the bottom of the cable compartment. step 2 Prepare the terminals and install them tightly, where reference can be made to the cable connector installation manual.
  • Page 50 6 Electrical Connection System Manual Communication Connection Area The external cable connection terminals of the communication box shown in the figure below. Description RS485 port for connecting the Logger4000 DI port for connecting the Logger4000 DI port for connecting the IO module DO port for connecting the Logger4000 DO port for connecting the IO module PT100&AI port for connecting the Logger4000...

  • Page 51: Auxiliary Power Supply Cable Connection

    System Manual 6 Electrical Connection • High voltage inside the communication box. To be operated by qualified personnel only. • Shut off Q1 of the communication box before the maintenance of the PE power board. • Shut off Q1 of the communication box before the maintenance of the XZ4 ~ XZ6 terminal block.

  • Page 52: Checking After Electrical Connection

    6 Electrical Connection System Manual • High voltage inside the power distribution cabinet. Repair after discharge. • Turn off the maintenance switch QSD1 before maintaining power distribution. • In the area where the UPS output is connected to the terminal block, turn off UPS before carrying out maintenance.
  • Page 53 System Manual 6 Electrical Connection Checking Item Requirement The container is clean and tidy inside, without any unnecessary cables, cable heads, terminals, or tools. No obvious garbage is Container found outside the equipment. Check the bottom of the MV Station and seal the gaps between the cables with fireproof mud.

  • Page 54: Power On The Mv Station

    Power On the MV Station The operations described in this chapter must be performed by professional personnel in accordance with local regulations/standards. Checking before Power on 7.1.1 MV Station Container Checking item The installation conforms to the design requirements. The container is level, and each door can be opened properly. There is no crack, dent, or scratch on the container surface.

  • Page 55: Mv Transformer

    System Manual 7 Power On the MV Station Checking item The door is closed. The auxiliary AC power circuit breaker in the cabinet is switched on. The conversion switch is in the remote position. The local operating switch has been padlocked. The load switch is opening and the grounding switch is closing.
  • Page 56 7 Power On the MV Station System Manual Remove the Locking Device figure 7-1 Remove the locking device of the pressure relief valve Adjust Voltage Ratio via Tap Changer Tap changer can adjust transformer output voltage. When operating tap changer, ensure that transformer is in the no-excitation state, that is, the high and low voltage sides of transformer are not live.

  • Page 57: Cabinet

    System Manual 7 Power On the MV Station 7.1.4 LV Cabinet Checking item Disconnector are turned off. The copper bar is not deformed, and no foreign matter is on the copper bar. Measure the ground resistance of Circuit breaker in and out of the copper bar;...

  • Page 58: Troubleshooting

    2. The pressure relief valve is faulty. is too large, resulting in damage to the film, contact Sungrow Power Co., Ltd. for replacement. 3. Improper oiling operation before servicing or installing the 3.
  • Page 59 System Manual 8 Troubleshooting Fault Possible Reason Measures 1. Transformer overload operation. 1. Check if the transformer is Overload operation may result in a overloaded. high oil temperature alarm. 2. Check the transformer heat 2. The heat dissipation channel is temperature dissipation channel for foreign blocked.

  • Page 60: Routine Maintenance

    Routine Maintenance Due to ambient temperature, humidity, dust, and vibration, the MV Station and the inner components will age and wear. To ensure the system safety and maintain the efficiency of the MV Station, it is necessary to carry out routine and periodic maintenance. All measures, which can help the MV Station work in good conditions, are within the maintenance scope.

  • Page 61: Maintenance

    System Manual 9 Routine Maintenance Respect the following five rules in maintaining or servicing the MV Station to ensure the safety of the maintainer. • Avoid any accidental re-connections. • Verify that no voltage or current is present with appropriate measurement instrument. •...
  • Page 62 9 Routine Maintenance System Manual Check Item Check Method Check whether the insulation binding tapes on the wiring terminals of power cables are flaked. Clean or replace the dust-proof network. table 9-2 Maintenance (once every half to one year after that.) Check Item Check Method Check the working status of the fan / heat exchanger.

  • Page 63: Checking And Cleaning The Filter

    Make sure all bolts are securely fixed. Repair immediately any anomalies found during routine maintenance. If there are any doubts, contact Sungrow. Checking and Cleaning the Filter It is recommended to clean the filter every six months to one year. If the product works in harsh environments, such as desert areas, the maintenance cycle should be shortened to three months.

  • Page 64: Checking And Cleaning The Air Inlets

    Do not pull hard during cleaning and replacing of the filter cotton and filter screen. The cotton and the screen may be damaged if otherwise. Contact Sungrow to order the filter. You can cut proper filters out of the larger filter. 9.3.2 Checking and Cleaning Air inlets of the Heat Exchanger step 1 Loosen the screws at the four corners of the air inlet of the heat exchanger and remove the air inlet grid cover.

  • Page 65: Oil Drain

    System Manual 9 Routine Maintenance step 2 Take out the filter cotton and clean it. step 3 Reinstall the filter. step 4 Restore the grid cover of the air inlet. - - End Oil Drain LocationThe oil drain valve is located at the bottom of transformer. * The figure is for reference only.

  • Page 66: Painting Make-Up Measures

    9 Routine Maintenance System Manual step 2 Fix the drain hose connector. Connect one end of the steel hose to the drain valve and the other end to the tank of the transformer. step 3 Open the oil drain valve, and the transformer oil flows slowly into the oil tank. step 4 When no transformer oil flows out, stop discharging oil.
  • Page 67 System Manual 9 Routine Maintenance Figure Step 1. Clean the smudginess on the surface by using a cleaning cloth (or other cleaning tool) with water. 2. If the smudginess cannot be cleaned by water, use 97% alcohol until the surface is clean enough to accept. (Or try other local frequently-used non-corrosiveness detergent) Maintenance and Operation Steps for Situation 2: Materials:...
  • Page 68 9 Routine Maintenance System Manual Figure Step 1. Polish the rough paint surface or the scratched parts by abrasive paper until the surface is smooth. 2. Clean the target parts by cleaning cloth with water or use 97% alcohol. 3. When the surface is clean and dry, paint the scratched parts of the paint by banister brush and make sure the painting is as uniform as possible Maintenance and Operation Steps for Situation 3:...
  • Page 69 System Manual 9 Routine Maintenance • Cleaning cloth • Water • Alcohol • Zinc primer • Hairbrush • Paint RAL7035 / Munsell color JN-82 N8.2 Figure Step 1. Polish the damaged parts of the paint to remove the surface rust or other roughness. 2.

  • Page 70: Replace The Fuse Of Lv Cabinet

    9 Routine Maintenance System Manual Figure Step 3. When the surface is clean and dry, paint the base material revealed parts with zinc primer (or other local primers with the same function) for protection. The paints should cover the revealed primer completely. 4.
  • Page 71 System Manual 9 Routine Maintenance Tools Name Source Ratchet wrench Scope of supply Torque wrench Load switch operating handle New fuse Screwdriver (M5) Beyond the scope of supply Multimeter Insulating gloves safety helmet Insulated shoes Preparations • Check and confirm safety helmet, insulating shoes, working clothes and insulating gloves have been worn.
  • Page 72 9 Routine Maintenance System Manual step 2 Remove a total of 6 fixing bolts from the top and bottom of the fuse in turn, slide the fuse box to the right and take it out forward. step 3 Remove the fixing bolts (M5) of the fuse box, open the fuse box, and replace the faulty fuse. The fuse failure indicator should be facing the transparent window of the fuse box.

  • Page 73: Appendix

    10 Appendix 10.1 Technical Parameters MVS6400–LV Transformer Transformer type Oil immersed Rated power 6400 kVA @ 40℃ Max. power 7040 kVA @ 30℃ Vector group Dy11y11 MV / LV voltage 10 – 35 kV / 0.8 - 0.8 kV Maximum input current at nominal voltage 2540 A ×...
  • Page 74 10 Appendix System Manual General Data Dimensions(WxHxD) 6,058x2,896x2,438 mm Approximate weight 20 T Operating ambient temperature range -20 to 60℃ (optional: -30 to 60℃) Auxiliary power supply 5 kVA / 400 V (optional: max. 40 kVA) Degree of protection IP54 Allowable relative humidity range (non- 0 –...
  • Page 75 System Manual 10 Appendix Main switch specification 4000 A / 800 Vac / 3P, 2 pcs Disconnector specification 260 A / 800 Vac / 3P, 24 pcs Fuse specification 315A / 800 Vac / 1P, 72 pcs Protection AC input protection FUSE+Disconnector Transformer protection Oil-temperature, oil-level, oil-pressure...
  • Page 76 10 Appendix System Manual Insulation class MV Switchgear Insulation type Rate voltage 24 – 36 kV Rate current 630 A Internal arcing fault IAC AFL 20kA/1s Qty.of feeder 3 feeders LV Panel Main switch specification 4000 A / 800 Vac / 3P, 2 pcs Disconnector specification 260 A / 800 Vac / 3P, 30 pcs 400A / 800 Vac / 1P, 90 pcs...
  • Page 77 System Manual 10 Appendix Maximum input current at nominal voltage 3557 A × 2 Frequency 50 Hz / 60 Hz Tapping on HV 0, ±2×2.5% Efficiency ≥99% (option：Tier II) Cooling type ONAN (Oil Natural Air Natural) Impedance 9.5% (±10%) Oil type Mineral oil (PCB free) Winding material Al / Al...

  • Page 78: Tightening Torques

    • The customer shall give SUNGROW a reasonable period to repair the faulty device. Exclusion of Liability In the following circumstances, SUNGROW has the right to refuse to honor the quality guarantee: • The free warranty period for the whole machine/components has expired.

  • Page 79: Contact Information

    10 Appendix For faulty products in any of above cases, if the customer requests maintenance, paid maintenance service may be provided based on the judgment of SUNGROW. 10.4 Contact Information In case of questions about this product, please contact us.
  • Page 80 Sungrow Power Supply Co., Ltd. www.sungrowpower.com...

This manual is also suitable for:

Mvs6400-lvMvs8850-lvMvs8960-lv

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