Ampcontrol Pty Ltd
– ABN 28 000 915 542
IPD USER MANUAL
IPDB014 Version 14
– SEP/2020
Uncontrolled Copy - Refer to Ampcontrol Website for Latest Version
Page 25 of 96
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To avoid nuisance tripping and false readings, consider the following during installation:
1. Keep cables as close to the centre of the toroid as possible. Do not tie them to one side of the
toroid. Remember to aim at symmetry.
2. Do not bring the cables back past the toroid within one diameter of the CT, trying to cram cables
into a small space reduces symmetry and may lead to problems, which are difficult to solve.
3. Avoid placing the CT near any device, which produces magnetic fields - whether it is a
transformer or other cables. Try to maintain several CT diameters clearance.
4. Many small cables tend to be worse than say three large ones. Try to position the CT in the
circuit with this in mind.
There are two standard sizes of Earth Leakage Toroid that are permitted for use with the IPD Relay: a
60mm Inner Diameter and a 112mm Inner Diameter.
Figure 5.7: Earth Leakage Transformer Dimensional Details
There are two standard sizes of Phase Current Transformer that are permitted for use with the IPD
Relay: a 45mm Inner Diameter and an 88mm Inner Diameter.
