System Manual
7 Checking before Power-On and Power- Off
41
No.
Checking item
5
If there is a relay protection tester or current source, check the value settings of
the protective device, including the set value, control word, and soft clamping
plate. The set value must match that provided by the user.
6
Check that the trip enable/disable slicer has been put into operation.
7
The door of power cable room is closed.
8
The auxiliary AC power circuit breaker in the cabinet is switched on.
9
The conversion switch is in the remote position.
10
The local operating switch has been padlocked.
11
The load switch is opening and the grounding switch is closing.
12
Remove all foreign matters in the medium-voltage ring main unit, such as tools,
installation residual materials, etc.
7.3
MV Transformer
No.
Checking item
1
There is no crack, dent, or scratch on the transformer surface.
2
No oil leakage occurs on the transformer surface.
3
The indication of the oil level gauge of the transformer is in lower position of the
normal operating range.
4
The oil temperature indicator of the transformer is close to the ambient
temperature.
The cover of the oil temperature meter is installed securely, the surface is clean,
and the glass is intact.
The temperature measurement loop is complete and intact.
5
The scale of transformer oil level indicator will show in 4 when temperature is
20
℃
.
6
The locking device of the pressure release valve has been removed, and the
pressure release valve does not work.
If not removed, follow the steps shown in the Fig.7-1 to remove the locking device.
7
The pressure gauge indicates a pressure of 0.
8
The tap changer is set according to the requirements of the user. If there is no
special requirement, set it to the rated level (level 3). The methods to adjust the
tap changer is shown in the Fig7-2.
When setting the level, open the handle. After adjusting the level, close the handle
to the slot.
After the check is complete, tighten the protective cover for the level switch.
9
There is no packing residue on the transformer surface, and there is no foreign
matter in the transformer room.
