Peak Withstand Current Test

 

  • new device with clean contacts

 

  • three-phase or two adjacent phases

 

  • rated duration, or not less than 0.3 sec

 

Short-Time Withstand Current Test

  • new device with clean contacts

 

  • three-phase or two adjacent phases

 

  • rated duration

 

AFTER TESTS, switch must:

  • exhibit no mechanical damage

 

  • carry continuous rated current without exceeding temp-rise limits

 

  • withstand rated voltage

 

  • be capable of its rated switching duties

 

  • if resistance increased by more than 20%, and contacts cannot be visually inspected, then add'l temp rise test may be appropriate

Peak Withstand Current Test

[1 kV £ U £ 52 kV] and

[52 kV £ U]

Reference IEC 694

 

 

 

 

 

Short-Time Withstand Current Test

[1 kV £ U £ 52 kV] and

[52 kV £ U]

Reference IEC 694

Peak Withstand Current Test

[1 kV < U]

  • new device

 

  • three-phase or two adjacent phases

 

  • minimum duration:
    10 cycles (0.167 sec)

 

Short-Time Withstand Current Test

  • new device

 

  • three-phase or two adjacent phases

 

  • rated duration

 

AFTER TESTS, switch must:

  • function mechanically

 

  • carry continuous rated current without thermal runaway

 

  • withstand 80% rated voltage

 

  • be capable of its rated switching duties

 

  • contact resistance can be checked to determine current carrying capability. Acceptable values to be specified by manufacturer.

Temperature-Rise Tests

 

 

 

  • stabilized when temp rise does not exceed 1 K/hour

 

 

  • ambient air temp between
    10° C and 40° C

 

  • resistance before and after temp rise test shall not differ by more than 20%

 

  • new device with clean contacts

 

  • air movement less than .5 m/s

Temperature-Rise Tests

[1 kV £ U £ 52 kV]

and [52 kV £ U]

 

Reference IEC 694

Continuous Current Tests

[1 kV < U]

 

  • stabilized when 3 consecutive values of temp rise, at 30-min. intervals, show max. variation of 1 degree

 

  • ambient air temp between
    10° C and 50° C

 

(no reference to before and after resistance)

 

 

(no reference to air movement or condition of device is cited)