Recording voltage events with the PQ event recorder

In addition to the standard-compliant evaluation of the power quality, the recording of the number and duration of short-term voltage events is a decisive feature for the quality and reliability of the power supply. These events, such as sudden load changes, switching operations, mains faults or lightning strikes, can disrupt or even damage connected devices.

The EPPE RX not only records the characteristics of voltage dips, voltage peaks (surges) and short and long-term interruptions, but also records their signature as an RMS value curve with a time resolution of one half-wave (T/2).

Maximum flexibility with four freely parameterizable continuous recordings

Up to four independent RMS continuous recordings can be parameterized in the EPPE RX, which can be executed simultaneously. Any measured values can be assigned to each recording. The interval times for averaging can even be assigned individually to each measured value.

Application examples:

1. Recording of all measured values with short interval times of up to one second for detailed fault and cause analyses.
2. Load profile recording with 15-minute intervals for commercial and industrial customers.
3. Continuous load profile recording with high temporal resolution for consumption optimization.

This flexibility makes it possible to adapt the measurements to the specific requirements of different applications.

Two fault recorders for recording transient network processes

The EPPE RX is equipped with two independent fault recorder units that can record transients of a few µs.

The two fault recorders can be individually adjusted in terms of their sampling rate, recording length for pre-fault, fault and post-fault history, the recording criteria (trigger) and the downstream message chain and can therefore be adapted to different measuring tasks.

Application examples for two fault recorder units:

Automatic analysis of grid faults

A typical measurement task is the recording of actual grid faults, where an automatic fault analysis must be carried out immediately after recording and a fault report including fault characteristics, fault location calculation and event log of the associated protection and switch messages must be created and sent in order to be able to rectify the grid fault quickly and in a targeted manner.

Identifying sources of interference and improving power quality

Another task is to record transient faults that do not directly lead to grid shutdowns but can damage connected consumers in the long term or impair their function. By analyzing this data, sources of interference can be identified and the power quality improved.

Simultaneous execution and long recording duration

Both application examples can be carried out simultaneously using the two fault recorder units of the EPPE RX. The recording duration of a disturbance recording can be up to 400,000 sampling points per channel, which corresponds to a recording duration of 40 seconds at 10 kHz or 400 seconds at 1 kHz recording rate, for example.

Precise recording of dynamic grid processes with the RMS recorder

The triggered RMS(T2) recorder of the EPPE RX is specially designed to analyze slow changes such as grid oscillations or balancing processes. These can be caused, for example, by short circuits, load shedding, switching operations, generator failures or lightning strikes. Analyzing these processes is crucial for assessing and improving system stability and helps to detect and rectify potential faults at an early stage to avoid unplanned shutdowns.

The RMS recorder records important signals such as current and voltage amplitudes, frequency, unbalance, power values or impedances with a high temporal resolution of up to twice the grid frequency (T/2) and an event duration of up to 60 minutes.