101 • High-Pot Test of the HRVS-DN Cabinet
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You can perform a Megger test (5kVDC) between the three phases connected together as one group
and ground. This Megger test should give a very high resistance result.
You can also perform a Megger test between the three phases. To do this you must connect L1B-U,
L2B-V, L3B-W.
Since the EPT-Tx is connected between the phases, the following resistances are be expected (all
values are ±5%):
HRVS-DN Rated
Voltage
L1 – L2
L2 – L3
L1 – L3
2.3kV 670KΩ 4MΩ 4.67MΩ
3.3kV 1MΩ 6MΩ 7MΩ
4.16kV 1.33MΩ 8MΩ 9.13MΩ
6.6kV 2MΩ 12MΩ 14MΩ
11.2 High-Pot Test in HRVS-DN up to 6.6kV, EPT-Tx Not Connected
High-pot test procedure for L1 (refer to Figure 40):
Dismantle the EPT-Tx
Short circuit the L1B and U busbars of phase L1.
Short circuit the L2B and V busbars of phase L2.
Short circuit the L3B and W busbars of phase L3.
Short circuit input-output phases of the Line Contactor.
Connect to ground L2 and L3
Connect the ground cable of the High-pot tester to cabinet ground (earth).
Connect the live cable of the High-Pot tester to the soft starter busbars of L1.
Set the tester to the correct testing voltage, as specified above. Perform the test for 1 minute.
Figure 40 – HRVS-DN up to 6.6kV – EPT-Tx not Connected Preparations for High-pot Test, Testing L1
High-pot test procedure for L2 (refer to Figure 41):
Dismantle the EPT-Tx
Short circuit the L1B and U busbars of phase L1.
Short circuit the L2B and V busbars of phase L2.
Short circuit the L3B and W busbars of phase L3.
Short circuit input-output phases of the Line Contactor.
Connect to ground L1 and L3
Connect the ground cable of the High-pot tester to cabinet ground (earth).
Connect the live cable of the High-Pot tester to the soft starter busbars of L2.
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