45
7.2.4 LV Cabinet
No.
Checking item
1 Disconnector are turned off.
2
The copper bar is not deformed, and no foreign matter is on the copper bar.
3
Measure the ground resistance of Circuit breaker in and out of the copper
bar; in the system that 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 ).
4
Measure the fuse resistance. Resistances of three phases shall be small and
the value is similar.
5
Lightning protection status indicates green.
6
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.
7
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.
8
The installation bolt of input cable has been tightened, and the cable is not
loose after pulling.
9 The cable inlet hole has been sealed.
10
Each component is intact.
11
Clear all foreign matter in the switchgear, such as tools and remaining
materials.
7.3 Power-on Steps
Before putting the MV Station into loaded operation, keep it running in the noload
state for 24 hours and ensure that there is no abnormality.
Operations such as handover test and system energization must be performed by locally
qualified electricians according to the national/local standards.
System Manual 7 Power On the MV Station
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