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Assumption
Assumption
Surge current = 40 A
Continuous Current = 15A (DC)
BS 1361 fuse is used
Source: Fuse - DIYWiki >> Incomer Fuses (BS 88 "HRC" & BS 1361)
Figure 1 Time/current characteristics for fuses to BS 1361
Step 10.1 Select the fuse
Step 10.1 Select the fuse
Continuous DC Current (A) <= Fuse rating (A)
Fuse rating is the curve line in time/current characteristics figure.
From Figure 1, the curve line (5A, 15A, 20A, 30A, 45A, 60A, 80A, 100A) shows available fuse rating.
15A fuse is selected because it equal to continuous current = 15A (DC).
Step 10.2 Determine the maximum time duration when a surge/shorted current occurred
Step 10.2 Determine the maximum time duration when a surge/shorted current occurred
Surge/shorted current = X-axis (Prospective current, A)
Maximum time duration = Y-axis (Time, s)
The fuse will blow if a surge current of 40 A flows through it for longer than 10s.
Step 10.3 Determine the maximum current that won't cause fuse blow all the time
Step 10.3 Determine the maximum current that won't cause fuse blow all the time
Maximum current that won't cause fuse blow all the time = X-axis (Prospective current, A) which not intersect with curve line
The fuse will not blow all the time if the current less than red line, example 20 A.
Reference
Reference
Fundamental of Solar Photovoltaics Technology - SEDA Malaysia- 3rd edition 2023
Example 7.8
SEDA GCPV Tutorial Fundamental - 28 Nov 2024
Balance of System Components - Question 9
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