Sungrow MVS6250 - LV Cabinet Pre-Power-On Checks

System Manual 7 Checking before Power-On and Power- Off
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Fig. 7-2 Adjust the voltage ratio via the tap changer
7.4 LV Cabinet
No.
Checking item
1
The copper bar is not deformed, and no foreign matter is on the
copper bar.
2
Check and make sure the neutral point of the transformer is not grounded, the
input & output wiring to grounding resistance should be M Ω level; In the neutral
point grounding system, outgoing wiring copper bar resistance shall be M Ω level
and phase to phase resistance shall be M Ω level. (need to disconnect the
auxiliary circuit breaker, or phase to phase resistance is generally 0 Ω ).
3
Measure the fuse resistance. Resistances of three phases shall be small and the
value is similar.
4
Lightning protection status indicates green.
5
Pull the current terminal chip to the open position and measure the resistance at
both ends of the fracture. The value of three-phase resistance should be small and
close. After the measurement, restore the current terminal to the connected
position and tighten it. The standby current loop shall be shorted and grounded.
6
Apart the grounding yellow green wire of the secondary circuit and measure
secondary loop to the ground resistance and resistance should be M Ω level.
Recover the grounding wire and the resistance shall be 0 Ω.
7
The installation bolt of input cable has been tightened, and the cable is not loose
after pulling.
8
The cable inlet hole has been sealed.
9
Each component is intact.
10
Clear all foreign matter in the switchgear, such as tools and remaining materials.