Sungrow SG250HX, Руководство пользователя

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The transformer must be protected against overloading and short circuit.
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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.
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Take ambient temperature, relative humidity, altitude, air quality, and other
environmental conditions into account when selecting and installing the transformer.
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When the anti-PID function is enabled, observe the following items:
– If the LV side winding is in Y shape, neutral point grounding is prohibited.
– Surge protective devices (SPD) for the AC combiner box and on the LV side of
the transformer are recommended to be connected in the "3 +1" manner, as
shown in the figure below. The Min. continuous operating voltages of M1-M4 are
690VAC.
– The LV side winding of the transformer, AC cables, and secondary devices (-
including protective relay, detection and measurement instruments, and related
auxiliary devices) must withstand the voltage to ground of at least 906V.
5.6.2 Requirements for OT/DT Terminal
OT/DT terminals (not included in the delivery scope) are required for fixing AC cables to
the terminal block. Purchase the OT/DT terminals according to the following
requirements.
O OT T//D DT T T Te errm miin na allss o off P Ph ha asse e W Wiirre e
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Specification: M12;
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Dimensions: a≤46mm / 13mm≤b≤15.5mm / c≤22mm
F Fiig gu urre e 5 5--2 2 Dimensions of Terminal
O OT T//D DT T T Te errm miin na all o off P PE E W Wiirre e
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Specification: M8 / M10.
User Manual 5 Electrical Connection