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Thermo Fisher Scientific

HT Cannot reach 300kV

Issue

HT cannot reach 300kV

Environment

Krios G3i

Resolution

These are possible resolutions for the issue:

  • Replace HT Tank

Cause

These are possible causes for the issue:

  • HT Tank is defective

Details

  1. High tension cannot reach maximum value, when it reaches 296kV it will drop to around 100kV, then it will rise again then fluctuate between 220kV and 270kV, and it will be stable around 200kV
  2. Inspected HT cable and visual check is passed.
  3. HT Generator Test: the result is the same as the symptom of this issue 4HT
  4. Generator Test with flange:
    • First time it is identical to the symptom of this issue
    • From the 2nd and 6th time, the test passed
    • Last time it failed again
  5. HTPOB replaced
  6. Double check the HT cables’ isolation
  7. Replaced HT Tank and the issue was fixed

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