Method and system for measuring current, especially the battery charging and discharging current

Method and system for measuring current, especially the battery charge and discharge current is applied in telecommunications and is used for contactless current measurement in the power systems of the telecommunications devices. The storage batteries of high or medium capacity are joined in parallel to the first battery clamp (BAT1), the second battery clamp (BAT2) and the third battery clamp (BAT3). After connecting of the battery, the capacitor of the reversible converter (PR) is charged through the thermistor (PTC) with a voltage of the battery, then a cycle of control charging/discharging of the battery begins by switching-on the reversible converter (PR) and switching the contacts of the excess current circuit-breaker (W), and the current value is measured using the first transducer (LM) and the second transducer (LD). In the system for measuring the charging/discharging current of the battery, the first battery clamp (BAT1) is connected to the second input (LM2) of the first transducer (LM), while the first input (LM1) of the first transducer (LM) is connected to the second contact (2) of the excess current circuit-breaker (W) and the second terminal (PTC2) of the thermistor (PTC), and the second clamp (BAT2) is connected to the fourth contact (4) of the excess current circuit-breaker (W), while the third clamp (BAT3) is connected to the sixth contact (6) of the excess current circuit-breaker (W).