Solution for outdoor use of split core current transformers

For the split current transformer installed in outdoor overhead lines or cable trenches, the cut surface of the transformer will be exposed to the air and will be exposed to rain or soaked in water in the cable trench, which will cause rust and affect the product performance. Water accumulation in the secondary terminal will also cause short circuit, so measures need to be taken to prevent rain or water immersion. Based on our many years of practical experience in manufacturing split current transformers, there are currently two solutions that can be used, which are briefly introduced as follows:

The first solution is to bury the secondary wire directly into the resin casting body (the wire uses a three-proof silicone wire) to prevent short circuits in the secondary terminal, and add a waterproof silicone ring to the cut surface for sealing and waterproofing. This solution has good protection for the secondary end and the cut surface, and can be widely used in all rain and water immersion occasions. In addition, because the base cannot be fixed in the cable trench, the base installation method is not used. The inner hole with a rubber plug is fixed on the cable. This installation method is shown in the figure below.

The second solution is the "open type current transformer + silicone rubber sleeve" solution, which is also used by customers for installation on low-voltage outdoor lines. However, this method can only prevent light rain and cannot prevent immersion in water, so it cannot be used for installation in places where water may accumulate, such as cable trenches. This solution is limited by the specifications of the silicone rubber sleeve and the inner diameter of the transformer can only be 50mm. The actual product is shown in the following photos: