Configuration

Characteristic curves

Basic task 1

• Known quantities:
  Converter, cycle time, overload factor, overload period
• Quantities to be found:
  (min.) base load duty period and max. base load current
• Solution:
  see table 2

Example for basic task 1

• Known quantities:
  • 30 A converter
  • Cycle time 113.2 s
  • Overload factor 1.45
  • Overload period 20 s
• Quantities to be found:
  • (min.) base load duty period
  • max. base load current
• Solution:
  • Limit characterisitic
    30 A converter
  • Overload factor 1.5
  • Overload period 300 =
    300 s/113.2 s) x 20 s =
    53 s ->
  • max. base-load current =
    44 % I_Bem = 13.2 A

Basic task 2

• Known quantities:
  Converter, cycle time, overload factor, overload period
• Quantities to be found:
  max.. base load duty period and max. base load current
• Solution see table 3

Example for basic task 2

• Known quantities:
  • 30 A converter
  • Cycle time 140 s
  • Overload factor 1.15
  • Base load current =
    0.6 I_rated = 18 A
• Quantities to be found::
  • Maximum overload period
  • Minimum base-load period

Solution:

• Limit characteristic for 30 A converter
• Overload factor 1.2
• Base-load current = 60 % I_rated ->
• Overload period₃₀₀ = 127 s
• Max. overload period =
• (140 s/300 s) x 127 s = 59 s
• Min. base-load duty period =
• 140 s – 59 s = 81 s

Table 1
Explanation of terms

Table 2
Steps to solve basic task 1

Table 3
Steps to solve basic task 2