Sungrow SG200HX-US handleiding
Handleiding
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5 Electrical Connection User Manual
• A distribution transformer can be used if it is designed for the typical cyclical loads of a PV
system (there is load in the day and no load at night).
• A liquid-immersed type transformer or a dry type transformer can be used, and the shield
winding is not a requisite.
• 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 the IT grid, to-ground withstanding volt
age of the LV winding of the transformer, the LV side AC cables, and the LV side secondary
equipment (including the relay protection device, detection & measuring device, and other
related auxiliary devices) should not be lower than 906 V.
• The line-to-line voltage on the HV side of the transformer should comply with the local
power grid voltage.
• A transformer with a tap changer on the HV side is recommended in order to keep the
voltage consistent with the grid voltage.
• At an ambient temperature of
30℃,
the transformer can run in 1.1 times of load for a long
time.
• The DC component that the transformer can withstand is 1% 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 15 inverters are connected to the grid, contact SUNGROW.
• The transformer must be protected against overloading and short circuit.
• The transformer is an important part of grid-connected PV generation system. The fault
tolerance capacity of the transformer should be taken into account at all times. The fault
include: system short circuit, grounding fault, voltage drop, etc.
• Take ambient temperature, relative humidity, altitude, air quality, and other environmental
conditions into account when selecting and installing the transformer.
• The overall technical requirements of the box-type LV cabinet are as follows:
- The breaking capacity of the branch molded case circuit breaker (MCCB) and air cir
cuit breaker (ACB) of the box-type LV cabinet should be greater than the short circuit
current at the LV side of the transformer. For example, the LV side short-circuit cur
rent of a boost transformer with a rated capacity of 3200 kVA and a short-circuit resis
tance of 7% can be calculated in the following way: I=3200/0.8/1.732/0.07/0.9=36.66k
A. Thus the MCCB Icu of the LV cabinet branch circuit should be no less than 36.66kA
at 880Vac. The LV side short-circuit current of a boost transformer with a rated capac
ity of 4480kVA and a short-circuit impedance of 8% can be calculated in the following
way: I=4480/0.8/1.732/0.08/0.9=44.91kA. Thus the MCCB lcu of the LV cabinet branch
circuit should be no less than 44.91kA at 880Vac.
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Productinformatie
| Merk | Sungrow |
| Model | SG200HX-US |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 11778 MB |
