Split core current transformer - QuickField simulation example
Current transformer is used to measure the AC current. The input current is transformed to a measurable value.
How to find output voltage of split-core current transformers?
Answer Typical applications Geometry
Given
Task
Solution
Results
Engineering question
Set up a plane-parallel QuickField AC Magnetics problem for a split-core current transformer and evaluate output voltage from computed field results.
split-core current transformers, clamp-on current sensors, nonintrusive CT devices
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Simulation problem
Problem Type
Plane-parallel problem of AC magnetics.
Model z-length is 10 mm.
Input AC current is 100 A, frequency is f = 50 Hz.
Secondary winding number of turns is N= 122, conductor cross-section is Sc = 0.1964 mm², copper conductivity is σ = 58.5 MS/m.
Core permeability μ = 1000. There are 2 air-gaps at the core parts junction 0.1 mm each.
Calculate the transformer's output voltage. The inner resistance of a voltmeter is 100 kOhm.
The winding is only partially represented in the 2D geometry model. Missing parts are represented by the resistor in the electric circuit.
Average turn length is 43.2 mm. The geometry model's winding sections have a total length of (10 mm + 10 mm).
The remaining part resistance is R_winding = (1 / σ) · N · (43.2 - 10 - 10) / Sc = 0.246 Ohm.
Output voltage is 1.3 V.
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