The invention relates to a measuring system for detecting variables on planetary carriers of a planetary gearing (1) comprising at least multiple planetary gear stages (11, 12), wherein at least each planetary gear stage (11, 12) comprises a respective sun shaft (6, 162), at least one respective ring gear (15, 19) and at least one respective planetary gear (10, 25) which is connected to the respective sun shaft (6, 162) and the respective ring gear (15, 19) by a toothed engagement, and a respective planetary carrier (5, 8) which is assigned to the at least one planetary gear (10, 25) and is rotationally connected to the at least one planetary gear (10, 25), wherein at least one first sensor, having at least one connection for supplying the at least first sensor with electrical energy, is arranged on at least one of the planetary carriers (5, 8) on at least one of the planetary gear stages (11, 12) for detecting variables of the assigned planetary gears (10, 25), and wherein the planetary gearing (1) has electronics by means of which the at least one first sensor can be supplied with electrical energy and wherein the at least one planetary gear stage (11, 12) is selectable from each of the available planetary gear stages (11, 12).