Fast fault recording for power system faults

When a limit value violation occurs, all analog and binary signals are recorded with a configurable sampling rate of 100 Hz to 30 kHz.

The recording comprises configurable time windows for the pre-fault, fault and post-fault periods. The fault recording duration can either be set to a fixed length or can be controlled by the actual duration of the event. These recordings make it possible to carry out comprehensive and detailed analyses of power system faults, including determination of fault location.

Slow fault recording

In addition to the analog and digital signals which are measured directly, the RMS recorder can also record all the quantities calculated on the basis of these signals, such as frequency, unbalance, positive sequence system, negative sequence system and zero sequence system, active power, reactive power and apparent power, harmonics etc. The sampling rate can be set between 1 Hz and double the system frequency (100 Hz/120 Hz). The recording is ideal for detecting and assessing slow processes, such as power swings, or for generator monitoring.

Uninterrupted data recording with continuous recorder

The continuous recorder records measurement data nonstop. The recorded data can be downloaded to a central computer/database at regular intervals without interrupting the measurement. This enables continuous recording for a practically unlimited period of time. The averaging intervals can be set freely. The mean value for the interval time and the highest and lowest single RMS values are recorded for each averaging interval. These long-term recordings provide comprehensive information on the whole power system, expose slow and fast changes, show switch-on peaks and reveal potential for energy savings.

Event recording with dynamic sampling rates

Event recording provides information on the time, level and duration of limit value violations and a classification of events to EN50160, UNIPEDE, CBEMA or ITIC, for example. RMS value event signatures can also be recorded if desired. To keep memory requirements to a minimum, the sample rate can be controlled dynamically. This means that fast signal changes are recorded with a higher resolution than slow signal changes.

Power quality analysis

The continuous recording of all power system parameters allows comprehensive power quality analysis to DIN EN 50160 or quality criteria defined by the individual user. Characteristic values are captured and calculated to IEC 61000-4-30 class A, IEC 61000-4-7 and IEC 61000-4-15. 

Because quality reports can be created automatically as PDF files as well, it is easy to provide proof of quality whenever required, even without specialist knowledge.

Recording of digital events and states

Binary inputs are primarily used to read in signals from protection relays and circuit breaker positions which are of decisive importance for the analysis of fault records.

Event classes with and without an acknowledgement obligation and message texts which can be listed or printed out chronologically can be assigned to the binary inputs for the continuous recording of binary signals (SER function).