Sungrow SG250HX-IN-20, Руководство пользователя

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R Re ec co om mm me en nd de ed d rra atte ed d vvo olltta ag ge e
R Re ec co om mm me en nd de ed d rra atte ed d c cu urrrre en ntt
800V 250A
Never connect a load between the inverter and the circuit breaker.
Multiple inverters cannot share one circuit breaker.
M Mu ullttiip plle e IIn nvve errtte errss iin n p pa arra alllle ell C Co on nn ne ec cttiio on n
If multiple inverters are connected in parallel to the grid, ensure that the total number of
parallel inverters does not exceed 30. Otherwise, please contact SUNGROW for
technical scheme.
M MV V ttrra an nssffo orrm me err
The MV transformer used together with the inverter should meet the following
requirements:
•
The transformer may be a distribution transformer, and it must be designed for the
typical cyclical loads of a PV system (load in the day and no load at night).
•
The transformer may be of the liquid-immersed type or dry type, and shield winding
is not necessary.
•
The line-to-line voltage on the LV side of the transformer should endure the output
voltage of inverter. When the transformer is connected to to the IT grid, to-ground
withstanding voltage of the LV winding of the transformer, the AC cables, and the
secondary equipment (including the relay protection device, detection & measuring
device, and other related auxiliary devices) should not be lower than 1,500V.
•
The line-to-line voltage on the HV side of transformer should comply with local
power grid voltage.
•
A transformer with a tap changer on the HV side is recommended in order to keep
consistent with the grid voltage.
•
At an ambient temperature of 40℃, the transformer can run in 1.1 times of load for
long time.
•
Transformer with a short-circuit impedance 6% (permissible tolerance: ±10%) is
recommended.
•
The DC component that the transformer can withstand is 0.5% of the fundamental
current at rated power.
•
For thermal rating, the load curve of the transformer and environment conditions
should be taken into account.
•
The apparent power of the inverter should never exceed the power of the
transformer. The maximum AC current of all inverters connected in parallel must be
taken into account. If more than 30 inverters are connected to the grid, contact
SUNGROW.
•
The transformer must be protected against overloading and short circuit.
5 Electrical Connection User Manual