Solcon HRVS-DN series - High-Pot Test in HRVS-DN from 10 Kv and Up, EPT-Tx Connected

103 • High-Pot Test of the HRVS-DN Cabinet
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You can perform a Megger test (5kVDC) between each phase to ground.
11.3 High-Pot Test in HRVS-DN from 10kV and Up, EPT-Tx Connected
Preparations (refer to Figure 43):
Short circuit the L1 and U busbars of phase L1.
Short circuit the L2 and V busbars of phase L2.
Short circuit the L3 and W busbars of phase L3.
Short circuit input-output phases of the Line Contactor.
Short circuit input-output phases of the Bypass Contactor.
Short circuit U, V W bus bars at the output of the soft starter.
High-pot test procedure:
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 basbars.
Set the tester to the correct test voltage, as specified above.
Perform the test for 1 minute.
Figure 43 – HRVS-DN from 10kV and Up – Preparations for High-pot Test
Note: You are allowed to 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 so, make sure that the L1-U,
L2-V, L3-W connections are performed.
Since the EPT-Tx is connected between the phases, the following resistances are expected (all
values are ±5%):
HRVS-DN Rated
Voltage
L1 – L2 L2 – L3 L1 – L3
10kV 18MΩ 3MΩ 21MΩ
11kV 20MΩ 3.3MΩ 23.3MΩ
13.2kV 24MΩ 4MΩ 28MΩ
13.8kV 24MΩ 4MΩ 28MΩ
15kV 26MΩ 4.3MΩ 30.3MΩ