Abstract <p>The effect of zero-sequence current of the fundamental and higher harmonics on the functioning of a low-voltage electric network has been estimated. To reduce the negative effect of zero-sequence current, it has been proposed to use special technical means: zero-sequence current compensators. The principles of designing such devices in the form of longitudinal and transverse inclusion of various combinations of dual electromagnetic devices with one or two windings that are similar to harmonic filters of low or high frequencies have been shown. A mathematical model of one of the possible circuits of a zero-sequence current compensator of the fundamental and higher harmonics and an experimental estimate of the operability of such a device has been provided. The efficiency of these devices for reducing zero-sequence currents has been shown.</p>