Siemens 38-3AH3 38 kV

Questions and Answers

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Norma MorganJul 31, 2025
What to do if closing springs charge but Siemens 38-3AH3 38 kV circuit breaker doesn't close?
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  spencer32Jul 31, 2025
  If the closing springs charge but the circuit breaker doesn't close, possible causes include a de-energized secondary control circuit or blown control circuit fuses, requiring you to correct the issue. There might be no closing signal to secondary disconnect pin 13, so check for continuity and correct protective relay logic. Also, secondary disconnect contacts 13 or 15 may not be engaging, and you should check and correct them as needed. Other potential issues are failure of the anti-pump relay (52Y) contacts, failure of the close coil (solenoid) (52SRC), auxiliary switch NC contacts 41 to 42 being open, or the spring-charged switch LS9 NO contacts remaining open after springs are charged. Check and replace or adjust these components as necessary.
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Michael ZamoraAug 8, 2025
Why won't the closing spring automatically charge on my Siemens 38-3AH3 38 kV Accessories?
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  Sydney AdamsAug 8, 2025
  If the closing spring won't automatically charge, it could be due to several reasons. The secondary control circuit might be de-energized, or the control circuit fuses could be blown; in this case, check and energize or replace the fuses as necessary. Alternatively, the secondary disconnect contacts 15 or 16 may not be engaging, requiring a check and possible replacement. Damage to wiring, terminals, or connectors could also be the cause, so inspect and repair them as needed. Other potential causes include failure of the charging motor (88.0), which would require replacement, or failure of the motor cut-off switch LS21 or LS22, also requiring replacement.
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Karen MooreAug 15, 2025
What to do if Siemens 38-3AH3 38 kV tripping coil (52T) does not energize?
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  Elizabeth RogersAug 15, 2025
  If the tripping coil (52T) does not energize, check for the following potential issues: damage to wiring, terminals, or connectors, and repair as necessary. Verify that there is a tripping signal to secondary disconnect contact 1, checking for continuity and correcting protective relay logic if needed. Also, check if the secondary disconnect contacts 1 or 2 are not engaging and replace them if required. Finally, the trip coil (52T) itself may have failed, requiring a check and replacement if necessary.
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Mary CrawfordAug 22, 2025
How to fix Siemens 38-3AH3 38 kV Accessories when tripping coil (52T) energizes but circuit breaker contacts don't open?
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  Sherry GarrettAug 22, 2025
  If the tripping coil (52T) energizes and a tripping sound is heard, but the circuit breaker contacts do not open, one or more of the vacuum interrupters may be held CLOSED. Check and replace them as necessary.