Insulation 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 test properly and record the measurement result in Test protocol for service work on the ESS.
    • Test voltage = 500 V

Measuring points

DSK+/-

PE connection mounting rail

The insulation test is considered as passed if a resistance value of ≥ 1 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.

Ending the insulation 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.