English to Portuguese Tech/Engineering Energy / Power Generation

Can anyone help me, please? Este termo "clearing time" está-me a dar problemas. Exemplos contextualizados:
- Juntar cerca de 3 a 4 ciclos ao clearing time do disjuntor médio
- A six second clearing time is equal to 360 cycles
- fault clearing time

Por outro lado há o "clearance", que me parece que aqui não é naquele sentido da autorização. Exemplos:
- avaria do sistema de clearance
- Guards shall be provided around all live parts operating at more than 150 volts
to ground without an insulating covering, unless the location of the live parts
gives sufficient horizontal or vertical or a combination of these clearances to
minimize the possibility of accidental employee contact
- Guidelines for the dimensions of clearance distances about electric equipment in
substations are contained in ...

Se alguém me puder ajudar, fico mesmo muito grata. Help would be much appreciated!! Thanks!!