Precision electroweak measurements in ATLAS in Run-2

The electroweak sector of the Standard Model can be tested via precision measurements of its fundamental parameters. The ATLAS collaboration has recently used such measurements to evaluate the effective leptonic weak mixing angle using data collected during the Run-1 of the LHC at a centre-of-mass energy of 8 TeV. The obtained result is $\sin^2 \theta_{eff}^{l} = 0.23140 \pm 0.00036$, yielding a precision similar to that of the recently published Tevatron legacy result and to the most precise individual observable measurements from lepton colliders. Recent measurements from the ATLAS experiment including polarisation studies in diboson final states as well as the observation of WZ and same-sign-WW production via vector boson scattering processes will be presented. These measurements can be used to constrain new physics that manifests as anomalous electroweak boson self interactions.