Sungrow MVS6840-LV User guide

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

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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
2.6 ESD_Protection..............................................................................................6
2.7 Symbols on the Device Body ...........................................................................6
2.8 Safety Warning Signs......................................................................................7
2.9 Daily Operation and Maintenance ....................................................................7
2.10 Others .........................................................................................................8
2.10.1 Manual Storage...................................................................................8
2.10.2 Disposal of Waste ...............................................................................8
2.10.3 Manual Description..............................................................................8
3 Product Description ..........................................................................................9
3.1 System Overview ...........................................................................................9
3.2 External Design............................................................................................10
3.2.1 MV Station Views................................................................................10
3.2.2 Composition .......................................................................................12
3.2.3 Exterior Dimensions ............................................................................12
3.3 Internal Design.............................................................................................13
3.3.1 Internal Composition ...........................................................................13
3.3.2 Cable Entries......................................................................................13
3.3.3 Internal Devices ..................................................................................14
4 Identify and Store the MV Station ................................................................20

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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
5.5 Clearance Requirement ................................................................................29
5.6 Removing Rain cover and Sealing Tapes .......................................................29
6 Electrical Connection .....................................................................................31
6.1 Safety Instructions........................................................................................31
6.1.1 Generals Rules ...................................................................................31
6.1.2 Five Safety Rules................................................................................33
6.2 Circuit Diagram ............................................................................................33
6.3 Preparation before Cable Connections ...........................................................34
6.3.1 Installation Tools .................................................................................34
6.3.2 Opening the Door................................................................................35
6.3.3 Checking the Cables ...........................................................................35
6.3.4 During Connection ..............................................................................36
6.4 Cable Connection.........................................................................................36
6.4.1 Ground Connection .............................................................................36
6.4.2 LV Side Connection.............................................................................37
6.4.3 MV Side Connection............................................................................42
6.4.4 Communication Connection .................................................................43
6.4.5 Auxiliary Power Supply Cable Connection.............................................45
6.5 Checking after Electrical Connection..............................................................46
7 Power On the MV Station ..............................................................................48
7.1 Checking before Power on ............................................................................48
7.1.1 MV Station Container ..........................................................................48

III
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
9.5 Painting Make-up Measures..........................................................................60
9.6 Replace the Fuse of LV Cabinet.....................................................................64
10 Appendix .......................................................................................................67
10.1 Technical Parameters .................................................................................67
10.2 Tightening Torques .....................................................................................72
10.3 Quality Assurance ......................................................................................72
10.4 Contact Information ....................................................................................73

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1About This Manual
1.1 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.
1.2 Demonstration of the Model
Model Rated power Devices can be connected
MVS6400-LV 6400 kVA@40℃20 x SG350HX
MVS6840-LV 6840 kVA@40℃24 x SG285HX
MVS8850-LV 8850 kVA@50℃30 x SG320HX
MVS8960-LV 8960 kVA@40℃28 x SG350HX
The function, appearance and wiring method of the models are the same, but the number of
inverters is different. This manual takes MVS8850-LV as an example to briefly introduce the
installation and wiring instructions of MV Station.
1.3 Target_Group
This manual is for technical personnel who are responsible for the transport, installation and
other operations of the MV Station. Only qualified personnel can perform the installation,
maintenance and troubleshooting of the MV Station. Unauthorized persons should not
perform any operation on the MV Station and should be away from the MV Station to avoid
potential hazards. Qualified personnel are:
• Equipped with certain electrical wiring and mechanical knowledge and familiar with
electrical and mechanical principle diagram
• Familiar with the construction and working principle of the PV grid-connected power
generation system; and familiar with the construction and working principle of the MV
Station upstream and downstream equipment
• Trained especially in the installation of electrical devices
• Capable of coping with the dangerous and emergency situations during the installation
and commissioning

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• Familiar with the country/regional standards and specifications
• Familiar with this manual
1.4 How to Use This Manual
Read this manual carefully before installing the device. Keep this manual and other product
component information together to ensure ease of access. In addition to this manual, the
following documentations are provided:
• MV Switchgear manual
• MV Transformer manual
• Other enclosed manuals
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.
1.5 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.
To ensure the optimum use of this manual, note the following explanations of the symbols
used.
DANGER indicates a hazard with a high level of risk which, if not avoided, will
result in death or serious injury.
WARNING indicates a hazard with a medium level of risk which, if not avoided,
could result in death or serious injury.
CAUTION indicates a hazard with a low level of risk which, if not avoided, could
result in minor or moderate injury.
NOTICE indicates a situation which, if not avoided, could result in equipment or
property damage.
1 About This Manual System Manual

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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!
Hot surface! Do not touch the hot surface of
the device.
Protective earth. Earthing securely to
ensure personal safety.
System Manual 1 About This Manual

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2Safety Instructions
2.1 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!
• Pay attention to and follow the warning signs on the device.
• Respect all safety instructions in this manual and other pertinent documents.
Electric shock or fire may occur due to device damage or system fault.
• Visually inspect the MV Station for device damages or other hazards.
• Check if the external devices and circuit connections are safe.
• Only operate the device when it is safe to do so.
All installations and operations on the MV Station must be in full accordance with
the national and local regulations and standards.
Ensure that the installation environment (such as voltage, temperature, humidity,
altitude, pollution level, water-proof and dust-proof level) is within the scope of
equipment specifications.
The locking device on the pressure relief valve must be removed before operation.
refer to """7.1.3 MV Transformer""".

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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.
2.2 Ground Fault Protection
If a ground fault occurs in the PV system, some parts that are supposedly voltage-
free may carry lethal voltage. Accidental touch may cause serious damage. Make
sure there is no system ground fault before performing operation and take proper
protective measures.
2.3 Live Line Measurement
Before electrical connection, please ensure that the substation and electrical
equipment inside it are intact and hazard-free. All electrical connections must meet
electrical standards of local country/region.
High voltages are present inside the device. Death can result from burning and
electric shock due to touching the live components of the MV Station. During live
line measurement,
• use suitable protective equipment, for example, dielectric gloves.
• accompanied by other persons.
2.4 Measuring Instrument
The instrument for measuring the electrical parameters should meet the following
requirements:
System Manual 2 Safety Instructions

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• 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.
• Use suitable protective equipment, for example, dielectric gloves during live
line measurement.
2.5 Voltage-free Operations
Perform operations on the MV Station only when all devices inside the MV Station are
completely voltage-free.
• Avoid any inadvertent re-connections.
• Verify that no voltage or current is present with appropriate testing devices.
• Ground and short-circuit whenever necessary.
• Cover possible live parts to avoid inadvertent touch.
• Ensure sufficient escape room.
• After the MV Station stops, wait at least 10 minutes before operating it.
• Ensure that the MV Station is completely voltage-free.
2.6 ESD_Protection
Devices may be damaged irreversibly by electrostatic discharge (ESD).
• Avoid unnecessary touching of the PCB.
• Observe all the ESD-related safety instructions.
• Wear proper personal protective equipment (PPE) such as wrist strap.
2.7 Symbols on the Device Body
Symbols on the device contain important information on safe operations of the MV Station
and its internal devices. Do not tear or damage them!
Do not damage or tear the symbols.
• All symbols on the device body must be clearly legible.
• Replace the symbols once any damage or illegibility is detected.
2 Safety Instructions System Manual

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2.8 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.
2.9 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.
Regularly check and maintain the MV Station and internal devices to ensure long-term and
reliable operation of the MV Station.
Make proper insulation protection during live line operation. At least two persons
are required until the operation is done.
Properfiled rescue facilities are necessary since locations of most power stations
are far away from the urban areas.
The equipment shall be operated in accordance with local laws and regulations
and strictly follow the safety precautions specified in this document.
Before maintenance or device replacement, please ensure that the substation has
been powered off and the high-voltage side switch and low-voltage side switch are
disconnected.
Take the followings into consideration during daily operation and maintenance:
• The nameplate is pasted on the MV Station body. It contains important parameter
information of the devices. Protect the nameplate during all operations.
• Wear proper PPE, such as safety glasses, safety footwear, and safety gloves, if
necessary.
• All necessary auxiliary measures are advisable to ensure personal and device safety.
System Manual 2 Safety Instructions

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2.10 Others
2.10.1 Manual Storage
Product manuals are an indispensable part of the product. Important information about the
transport, installation of the MV Station is included in this manual. All the descriptions in this
manual, especially those safety-related items, must be complied with. Please read all the
instructions thoroughly prior to performing any operation work on the MV Station.
• Transport and install the MV Station strictly following the descriptions in this manual.
Device damage, personal injury, or property loss may follow if otherwise.
• This manual and relevant documents should be available for relevant persons at all
times.
2.10.2 Disposal of Waste
When the MV Station has come to the end of its service life, it cannot be disposed of
together with household wastes. Some inside components can be recycled while some
components can cause environmental pollution.
Please contact the local authorized collection point.
2.10.3 Manual Description
For user convenience, there are a large number of pictures in this manual. These
pictures are indicative only. For details about the device, please refer to the actual
product you receive.
Keep this manual at a convenient place near the device for future reference.
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.
2 Safety Instructions System Manual

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3Product Description
3.1 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.
MV Station is a booster device used in conjunction with the inverters. The main function is to
convert the low-voltage from the inverters into medium-voltage and feed into the grid.
The MV Station integrates LV cabinet, MV transformer, MV switchgear, power distribution
cabinet ,communication box and auxiliary transformer.
The PV power generation system with the MV Station is shown in the following figure.

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3.2 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
3 Product Description System Manual

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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.
System Manual 3 Product Description

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3.2.2 Composition
No. Name Description
1 LV room
Including low voltage connection area, low voltage cable
entries, etc. It can be connected to the PV grid-
connected inverters.
2 Transformer room
Including a MV transformer.
The MV transformer converts the inverter output low-
voltage into grid-compatible medium-voltage.
3
MV room and
power distribution
room
The power distribution room is on the front side, with a
communication box and an LV power distribution cabinet
integrated inside.
The MV room is on the back side, with one MV
switchgear included inside.
3.2.3 Exterior Dimensions
Width(W) Height(H) Depth(D)
6,058 mm 2,896 mm 2,438 mm
The Clearance Requirement
The clearances around the MV Station should be sufficient for the doors to be opened .
3 Product Description System Manual

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3.3 Internal Design
3.3.1 Internal Composition
No. Name
A LV cabinet
B MV Transformer
C MV switchgear
D Communication box and power distribution cabinet
3.3.2 Cable Entries
Top View
System Manual 3 Product Description

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No. Name Description
A LV side cable entries All LV side cables connecting the MV Station go
inside through these entries.
BMV side cable
entries
All MV side cables connecting the MV Station go
inside through these entries.
C
Communication &
Power distribution
cables entry
All communication cables and power distribution
cables connecting external device go inside
through this entry.
DMaintenance entry For ease of oil tray maintenance.
*The dimensions in parts B and C above are for OMZB 36KV CCV, other manufacturers'
specifications are listed below.
3.3.3 Internal Devices
The MV Station consists of LV room, transformer room, MV room, and power distribution
room.
3.3.3.1 LV Cabinet
The LV cabinet is located at the LV room inside the MV Station. It is used to converge and
transmit low voltage from the inverter to the step-up transformer, and feed it into the MV grid.
3 Product Description System Manual