Insulation test of entire storage bundle

Required tools:

  • Measuring instrument for insulation test
  • Insulated single-core cable (e.g. H07V-K), cable ends with M8 and M10 forked cable lugs:
    • Cross section: ≥ 2.5 mm2
    • Length: approx. 1 m
  • Wrench SW 13
  • Wrench SW 17

 

Preparation:

  1. Disconnect the DC link connections from the storage bundle (DSK+ on the first module and DSK- on the last module installed).
  2. Unscrew all signal monitoring cables.
  3. Short-circuit the DSK storage bundle with the prepared insulated single-core cable (yellow cable between DSK+ on module 1 and DSK- on module 8).
  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.

If you measured a measured value less than 1 MOhm during the insulation test of the entire storage bundle, you must measure each module individually. In this case, skip the following steps 6 and 7. Only perform step 5 and then continue with chapter Insulation test of a single DSK module.

Ending the insulation test:

  1. Remove the short circuit between DSK+ on module 1 and DSK- on module 8 on the storage bundle (yellow cable).
  2. 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.