Note: The two ranges given for full load ratings of 15 and 25 Amps require two primary
wraps of the current transformer whereas all other ranges require a single through primary.
Figure 4.3 shows the HF3A current transformers with a single through primary hook-up
and with two primary wraps. When taking multiple primary wraps on the HF3A current
transformers, ensure that the wraps are wound to the sides and not across the top or
bottom of the current transformer.
9
Figure 4.2
Full Load Current Ratio Primary HPL110 Range Effective Range
Amps Transformer Primary : Secondary Turns Setting Amps
1 Internal 1 : 1 1 1 1
3 Internal 1 : 1 1 3 3
5 Internal 1 : 1 1 5 5
8 Internal 1 : 1 1 8 8
10 HF3A,050/5 50 : 5 1 1 10
15 HF3A,050/5 50 : 5 2 3 15
25 HF3A,050/5 50 : 5 2 5 25
30 HF3A,050/5 50 : 5 1 3 30
50 HF3A,050/5 50 : 5 1 5 50
75 HF3A,075/5 75 : 5 1 5 75
100 HF3A,100/5 100 : 5 1 5 100
150 HF3A,150/5 150 : 5 1 5 150
Figure 4.3
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