Residual current analysis systems DRCA-1-Set
DRCA 1-Set measuring system for analysing discharge/residual currents

Measuring devices are used to detect residual currents or current consumption levels. Due to the increasing use of type B RCDs to protect systems with power electronics equipment (e.g. frequency converters) there are also increasingly more trips from these RCDs to monitor without being able to identify a fault in the system using conventional analysis processes. The cause of these faulty trips are usually residual currents in the form of capacitive leakage currents with frequencies that deviate from the mains frequency and that flow to the earth via real or parasitical capacitance (e.g. EMC capacitors or line capacitance). Depending on the type of electronic equipment, leakage currents may have very different frequency mixes. As these residual currents on the earth resistance of the electrical system also cause touch voltage, they must be detected by an RCD and effect a trip. Measuring systems of this class facilitate the analysis of residual currents and residual current mixes with frequencies that deviate from the mains frequency. The analysis results usually point to the cause of the leakage current, thereby providing information on measures of how to reduce it in order to use a Type B RCD without problems. Measuring devices of series DRCA offer multi-layered analysis tools for determining the source of residual currents and the selection of suitable RCDs. The set consists of the following components: 1. DRCA 1 measuring unit: The DRCA 1 measuring unit analyses the measured values and prepares them for further processing on the PC connected to the unit via a standard USB port. 2. DRCA 1-MC measuring cable: The DRCA 1-MC measuring cable ensures correct transmission of the measured values to the measuring unit. 3. DRCA 1-CT70 measuring bushing transformer: The residual current transformer covers all of the active conductors leading to the consumers and uses its output signal to illustrate the time curve of the sum of all conductor currents flowing through it. Its output signal is proportional to the residual current, which flows back to the earthing point of the supply mains via the protective earth conductor in the case of an insulation fault or via the earth. From this signal the residual current level is evaluated by the measuring unit of the analysis system and passed on for display on the connected PC. 4. DRCA?1-SW analysis software: The DRCA 1-SW analysis software provides a range of functions for displaying and evaluating the measured values.

DRCA 1-CT70 bushing transformer: 70 mm inside diameter, suitable for detecting residual currents from 10 Hz to 100 kHz, different internal diameters