RCM Measuring Devices

Continuous monitoring can detect residual currents at an early stage and prevent system damage, including production downtime. The crucial factor is to detect the usually creeping increase in residual currents before fuses trip or there is a disruption in data transmission/production. Proper RCM measurement also monitors loads and cable installations for residual currents and offers an alternative to insulation measurement on fixed electrical installations (see IEC 60364-6:2016). This can circumvent downtime in high-availability installations and significantly reduce testing costs. Additionally, there are other benefits, such as preventive fire protection and the detection of stray return currents that cause EMC issues.

For this task, the RCM 202-AB measuring device is ideal. It can detect, analyze, and monitor residual currents of types A, B, and B+. The evaluation includes all types of residual currents with associated frequency analysis. For example, it can individually display 50 Hz, pure DC, or high-frequency residual currents in the range of 20 kHz. This allows for a quick identification of the type of fault, helping the user know where to look.

The RCM 202-AB can be combined with standard differential current transformers from Janitza and allows for Type B+ measurements, even with separable transformers. Due to its wide frequency range and patented measurement method, the transformers can be used flexibly. With these performance features, the RCM 202-AB is the first B+ type RCM device for retrofitting in existing installations. It is perfectly suited for high-availability installations where outages are not possible, and good EMC must be ensured, such as in data centers, hospitals, manufacturing facilities, or logistics centers.