Huawei FusionPower6000 3.0 User Manual page 168

FusionPower6000 3.0
User Manual (Not Against a Wall)
Devices, components, and secondary circuits that will be affected by insulation
and dielectric strength tests on the customer load side must be isolated or
disconnected. Otherwise, the devices, components, and secondary circuits may be
damaged.
Step 6 Use a megohmmeter or a device with the same function to test the insulation
(500 V DC) between the three phases of the main busbar of the low-voltage
cabinet, between the three phases and the PE bar, and between the three phases
and the N bar. The insulation resistance must be at least 0.5 megohms. (In some
countries or regions, the insulation resistance must be at least 10 megohms. The
local regulations prevail.)
Step 7 (Optional) If a dielectric strength tester is available onsite, perform a dielectric
strength test.
1.
2.
3.
4.
Step 8 Reinstall the removed cables and components and restore the component status
based on the electrical diagrams and records
----End
Issue 03 (2023-02-08)
NO TICE
Check that the switches of the cable inlet cabinet and bus tie cabinet are
turned off. Remove the main ground bar connecting the transformer cabinet
to the adjacent cabinet. Remove the N and PE bars from the bus tie dense
busway, and wrap the copper bar contact surface with heat shrink tubing or
insulation tape.
Use a dielectric strength tester to test the withstand voltage between the
three phases of the main busbar of the low-voltage cabinet, between the
three phases and the ground, and between the three phases and the N bar.
The withstand voltage must be 1890 V AC or 2670 V DC for 5s. During the
test, the leakage current must not exceed 100 mA (1890 V AC) or 10 mA
(2670 V DC).
Reinstall the main ground bar connecting the transformer cabinet to the
adjacent cabinet. Remove the heat shrink tubing or insulation tape from the
contact surface of the PE bar, and reconnect the N and PE bars for the bus tie
dense busway.
NO TICE
After reinstalling the copper bars, check the torque and mark them.
Use a multimeter to check the connectivity between the main ground bar and
the N bar of the cabinet adjacent to the transformer cabinet, and between
the main ground bar and the N bar of the bus tie dense busway. Use a
multimeter to check the connectivity between the main ground bar and the
PE bar of the cabinet adjacent to the transformer cabinet, and between the
main ground bar and the PE bar of the bus tie dense busway.
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