Insulation resistance test of a single DSK module

Preparation:

  1. Disconnect the DC link connections to the adjacent modules (DSK+ and DSK-).
  2. Unscrew all signal monitoring cables.
  3. Short-circuit the DSK module that you want to test between DSK+ and DSK-.
  4. Perform the insulation resistance test properly and record the measurement result in Test protocol for service work on the ESS.
  5. Select the largest possible value of the test device used.
    • Test voltage = at least 500 VDC; ideally up to 2 kVDC

Measuring points

DSK+/-

PE connection mounting rail

The insulation resistance test is considered as passed if a resistance value of ≥ 10 MOhm or no conductive connection is displayed at a test voltage of 500 V.

Several defective energy modules can also be present in a storage bundle. Replace them.

End the insulation resistance test:

  1. Remove the short circuit between DSK+ and DSK-.
  2. Restore the DC link connections between the individual DSK modules. Observe the tightening torques specified in the following table:

Connection point

Thread

Tightening torque

DSK+

M8

20 Nm

DSK-

M10

30 Nm

  1. Establish the DC link connection on the storage bundle (between DSK+ on module 1 and DSK- on module 8). Observe the correct sequence of the cables and the tightening torques from the following table:

Sequence of the cables

1

Connection pole

2

Storage unit connection 35 mm²

3

Discharge unit connection 2.5 mm²

4

Washer

5

Lock washer

6

Screw

Connection point

Thread

Tightening torque

DSK+

M8

20 Nm

DSK-

M10

30 Nm

  1. Screw on all signal monitoring cables.