Sungrow MVS6250 User manual

MVS6250_6800-SEN-Ver11-202003
MVS6250/MVS6800
MV Station
Transportation and Installation Guide

I
Contents
1About This Manual................................................................... 1
1.1 Validity .........................................................................................................1
1.2 Target Group ...............................................................................................1
1.3 Symbols Explanation...................................................................................1
1.4 Terminology.................................................................................................3
2Safety 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..................................................................................6
2.9 Daily Operation and Maintenance ...............................................................7
2.10 Others ................................................................................................7
2.10.1 Manual Storage.................................................................................7
2.10.2 Disposal of Waste .............................................................................8
2.10.3 Manual Description ...........................................................................8
3Product Description ................................................................. 9
3.1 System Overview ........................................................................................9
3.2 External Design ...........................................................................................9

II
3.2.1 Composition ........................................................................................9
3.2.2 MV Station Views ............................................................................. 10
3.2.3 Exterior Dimensions ......................................................................... 11
3.3 Internal Design ......................................................................................... 11
3.3.1 Internal Composition ........................................................................ 11
3.3.2 Bottom Cable Entry .......................................................................... 12
3.3.3 Internal Devices ............................................................................... 13
4Identify and Store the MV Station ........................................... 16
4.1 Identifying the MV Station ........................................................................ 16
4.2 Checking for Transport Damages ............................................................ 16
4.3 Storage of the MV Station ........................................................................ 17
5Mechanical Installation........................................................... 18
5.1 Transport .................................................................................................. 18
5.2 Hoisting the MV Station ............................................................................ 19
5.2.1 Safety Precautions ........................................................................... 19
5.2.2 Hoisting ............................................................................................ 20
5.2.3 Fastening of Connectors .................................................................. 21
5.3 Foundation................................................................................................ 22
5.3.1 Selection of Installation Site ............................................................. 22
5.3.2 Foundation Requirements................................................................ 22
5.3.3 Recommended Foundation Construction Plan ................................ 23
5.3.4 Other Precautions ............................................................................ 25
5.4 Securing the MV Station(optional)............................................................ 25
5.5 Removing Sealing Plates, Sealing Tapes and Fasteners ........................ 26
5.6 Opening the Door of Transformer Room .................................................. 27
5.7 Clearance Requirement............................................................................ 28

III
6Electrical Installation .............................................................. 29
6.1 Safety Instructions .....................................................................................29
6.1.1 General Rules ...................................................................................29
6.1.2 Five Safety Rules ..............................................................................31
6.2 Circuit Diagram..........................................................................................31
6.3 Cable Connection......................................................................................32
6.3.1 Ground Connection ...........................................................................33
6.3.2 LV Side Connection ..........................................................................34
6.3.3 MV Side Connection .........................................................................37
6.3.4 Communication Cable Connection ...................................................37
6.3.5 Auxiliary Power Supply Cable Connection .......................................37
6.4 Checking after Electrical Connection ........................................................38
7Checking before Power-On and Power- Off............................ 40
7.1 MV Station Container ................................................................................40
7.2 MV Switchgear ..........................................................................................40
7.3 MV Transformer ........................................................................................41
7.4 LV Cabinet.................................................................................................43
8Troubleshooting..................................................................... 44
9Routine Maintenance ............................................................. 46
9.1 Safety Instructions .....................................................................................46
9.1.1 Safety Rules......................................................................................47
9.2 Maintenance ..............................................................................................47
9.2.1 Introduction .......................................................................................47
9.2.2 Maintenance Interval.........................................................................47
9.3 Maintenance Items ....................................................................................48
10 Routine Maintenance ............................................................. 52

IV
10.1 Safety Instructions .......................................................................... 52
10.1.1 Five Safety Rules ........................................................................... 53
10.2 Maintenance ................................................................................... 53
10.2.1 Introduction .................................................................................... 53
10.2.2 Maintenance Interval...................................................................... 53
10.3 Maintenance Items ......................................................................... 54
11 Parameters............................................................................ 56
11.1 Technical Parameter....................................................................... 56
11.2 Tightening Torques......................................................................... 57
12 Contact Information................................................................ 58

1
1 About This Manual
1.1 Validity
This manual is intended for the following product
MVS6250
MVS6800
Hereinafter it will be referred to as " MV Station" unless otherwise specified.
1.2 Target Group
This manual is for technical personnel who are responsible for the transport, installation and
other operations on the MV Station.
Only qualified personnel can perform the installation. 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
Familiar with the country/regional standards and specifications
Familiar with this manual
1.3 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.

1 About This Manual System Manual
2
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.
NOTE indicates additional information, emphasized contents, or tips to help
you solve problems or save time.
The symbols below may be pasted on the electrical parts of the MV Station or its internal
device. 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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1.4 Terminology
Name
For short
MV Station
MV Station
COM100 Communication Box
COM100 / communication Box
The foregoing devices are expressed in the abbreviation form in this document unless
otherwise specified.

4
2 Safety Instructions
Read the safety instructions carefully before installing the MV Station. Refer to
corresponding manuals for the safety instructions on the internal devices.
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.

System Manual 2 Safety Instructions
5
The locking device on the pressure relief valve must be removed before operation. Refer
to "Fig. 7-1 Remove the locking device of the pressure relief valve".
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
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, and
accompanied by other persons.
2.4 Measuring Instrument
The instrument for measuring the electrical parameters should meet the following
requirements:
The instrument for 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 Safety Instructions System Manual
6
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 5 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.
2.8 Safety Warning Signs
During transport, installation, maintenance, and troubleshooting of the MV Station, keep
unauthorized persons away.

System Manual 2 Safety Instructions
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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.
Proper filed rescue facilities are necessary since locations of most power stations are far
away from the urban areas.
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.
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 Safety Instructions System Manual
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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.

9
3 Product 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.
The PV power generation system with the MV Station is shown in the following figure.
PV Array PV Array Combiner Box
DC AC Communication
Grid
MV Station
Inverter
Remote
Monitoring
Inverter
3.2 External Design
3.2.1 Composition
The MV Station consists of a transformer room and a switchgear room, as shown in the
figure below.
1 2
No.
Name
Description
1
Transformer room
Including one MV transformer and an LV room inside. The
MV transformer converts the inverter output low-voltage AC
current into grid-compatible medium-voltage level.

3 Product Description System Manual
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No.
Name
Description
2
Switchgear room
Including an MV switchgear, a control panel, and a
communication box.
The MV switchgear is connection point of the MV Station and
grid and also the main protection device for the connection
and disconnection from the grid.
3.2.2 MV Station Views
View
Description
Front view.
Front of the MV Station.
A
Back view.
Back of the MV Station.
Left view
Left of the MV Station.
Right view
Right side of the MV Station.
*Figures are indicative only, and actual product may differ.
Installation Area of Fire Extinguisher(optional)
Figure A above shows the installation area of the fire extinguisher. On site, fire extinguishers
need to be installed according to the requirements of the installation location.

System Manual 3 Product Description
11
3.2.3 Exterior Dimensions
Dimensions
Width（W）
Height
（H）
Depth（D）
Width(W)
Height(H)
Depth(D)
6,058 mm
2,896 mm
2,438 mm
Clearance Requirements
8219
5349
3.3 Internal Design
3.3.1 Internal Composition
Device layout inside the MV station is as follows:
AB
D
C
No.
Name
A
LV connection area
B
MV Transformer
C
MV switchgear

3 Product Description System Manual
12
No.
Name
D
Communication box and control panel (upper part and lower part respectively)
3.3.2 Bottom Cable Entry
Cable entries are designed on the bottom of MV Station. All cables connecting MV Station
and external devices run in and out through the bottom cable entries.
Bottom View
B
C
A
580
1040 D
200
200
3x
Table 3-1 Cable entry of MV Station
No.
Name
Description
A
LV side cable entry
All LV side cables connecting the MV transformer go inside
through this entry.
B
Maintenance entry
This entry is designed for future cleaning and oil tray
maintenance.
C
Communication and
power distribution
cables entry
All communication and power distribution cables
connecting external device go inside through this entry.
D
MV side cable entries
All MV side cables connecting downstream MV grid go
inside through these entries.

System Manual 3 Product Description
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MV Side Cable Entries
(1) (3)
260
225
240
274
276
258
(2)
395
277
395
262
370
350
(4)
Table 3-2 Cable entry of the MV switchgear
Manufacturer of the MV switchgear
Grid voltage
Dimensions
Siemens
24kV
Refer to the foregoing figure
(1)
ABB
24kV
Refer to the foregoing figure
(2)
ABB
36kV
Refer to the foregoing figure
(3)
OMAZABAL
24kV/
36kV
Refer to the foregoing figure
(4)
3.3.3 Internal Devices
The MV Station consists of the MV transformer, MV switchgear, communication box, and
control panel.
MV Transformer
Figure
Name
Description
20
40 60
80
100
120
Oil temperature
Indicator
The alarm temperature is set to 90°C.
When the oil temperature reaches the
value, alarm signals will be sent to the
communication unit.
The tripping temperature is set to
100°C. When the oil temperature
reaches the value, tripping signals will
be sent to the communication unit. At
the same time, the transformer will be
disconnected from the upstream and
downstream devices.

3 Product Description System Manual
14
Figure
Name
Description
20
40 60
80
100
120
Winding temp indicator*
To obtain the temperature of the
winding. The alarm temperature is set to
be 100°Ca)
The tripping temperature is set to be
110°Cb)
Pressure gauge
The pressure gauge is used to obtain
the pressure inside the oil tank.
Pressure relief valve
The valve automatically releases when
the oil pressure inside the oil tank
reaches 55kPa.
The locking device on the pressure relief
valve must be removed before
operation. refer to "Fig. 7-1 Remove the
locking device of the pressure relief
valve".
MIN
-30 C
MAX
Oil level indicator
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 safe operation of
the transformer.
When the oil level is excessively high,
open the drain valve to lower the oil
level.
When the oil level is excessively low,
disconnect the transformer and check
the oil tank for leakage. If so, open the
oil filling valve to fill the oil tank.
Tap changer
The tap changer has five tap positions.
For the voltage and current
corresponding to each tap position, refer
to the nameplate on the transformer.
Drain valve with
sampling
Open the valve for oil drainage when the
oil level is excessively high or when
operations such as maintenance are
required.