Fluxgate current sensor is widely used because of its high precision

small size

non-contact current detection

and simple structure.The sensor probe is the core component of the fluxgate sensor

which consists of excitation coils

induction coils and magnetic cores.In order to facilitate current detection in power systems

an open-close dual-magnetic-circuit probe is optimized and designed based on the traditional fluxgate current sensor.The influences of key parameters

such as excitation frequency and number of magnetic core layers on the probe’s excitation current and induced electromotive force are analyzed by the finite element analysis method.Through simulation

the sensitivity and linearity of the fluxgate current sensor reach 79mV/A and 0.11%

respectively

within the measuring range of ±10A

which verifies the rationality of the design.