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Power Fault RecordingPower Fault Records and Power Monitoring in Energy Transmission Grids
The changing energy market and consumer technologies have also influenced the requirements for the power fault recorders. When formerly it was sufficient to know the voltage value and curve progression, we do nowadays want to know the reason for disturbances but also anomalousness to the normal mode in detail. Power quality issues are always a part of it and power flows in all four quadrants are daily work.
Task
Such modern fault recorders are meant to take over the functions of several instruments and should additionally be of perfect use to up-to-date communication systems in order to centrally provide the data to several user groups.
- Digital fault recorders fast (wave form, a few seconds)
- Digital fault recorders slow (periodic values, several minutes)
- Voltage monitoring
- Paper recorder replacement
- Power quality monitors
- Load curve monitoring
One central data base solution should not only be able to centrally store the data but rather support an automated reporting system. E-mail notification in case of an error, automatically updated recorder feature and the integration in existing scada systems are among the required functions. Report generator and on-screen reports are standard.
Solution
- signal conditioning by DEWETRON
Hardware
DEWETRON’s reaction to this is the fault recorder concept DEWE-PFR. Due to the very different requirements of individual transformer stations a very simple and flexible hardware system is obligatory. Based on the DEWE-PFR systems these requirements can be met. Arbitrary number of channels, easy change of voltage and current input channels, user-friendly maintenance and cascading possibility characterize this instrument group. Moreover, highest EMV (electromagnetic compatibility) requirements are necessary. Differential input channels, isolated circuits and secure current paths are guaranteed by the DAQP-HV and DAQP-LA modules.
Software
The measurement software DEWESoft, combined with the analysis and evaluation package PMT, fulfills all needs of a monitoring system for energy grids.
- U,I
- P,Q,S, cosPhi
- Fault records fast, full sampling rate
- Fault records slow, periodic values
- Fundamental oscillation values
- Harmonics, THD, K-factor
- Flicker
- 3~ systems
- 2~ systems
- Flexible report generator
- Monitoring possible from any location
- Differently frequent systems on one data acquisition system
- Remote maintenance
Special Features
Time Synchronization
The chronological synchronization of the fault recorders can either be done via the LAN or externally via GPS or DCF77 clocks. Using the LAN way it does not even matter which protocol is available: SNTP or NTP via TCP or UDP.
GPS Synchronization/Phasor Measurement
The PPS impulse (synchronous impulse via satellites with an accuracy of 1 nanosecond) provides absolutely synchronous measurements between the transformer stations. This impulse is split into the sampling rate (e.g. 20 kHz) and then used as clock signal for the A/D converter. A comparison of phase angles over wide distances can thus easily be done via the online system.
Crosstrigger
Fault recording is the main feature of these instruments. It is also possible to send the trigger reason for the fault record to other fault recorders in the net and thus obtain global recordings. The synchronization is reached by sending the exact time stamp. At the same time, the data from the circular buffer are stored and evaluated.
E-Mail, SNMP
Another very useful function is the e-mail support. Triggers of fault records, the reaching of limit values, instrument errors or also communication problems are sent to personally defined user groups via e-mail. Similar possibilities are offered by SNMP. Reports such as e.g. weekly analyses can also be automatically generated and sent.
Online Monitoring
Direct access to the fault recorders provides authentic online monitoring. Additionally, saved data can be automatically updated as diagrams and fault records automatically show the latest entries.
Open Data Base Structure
The structure of the data base is disclosed for the user. Individual reports, websites or special analyses can easily be added to the data. We are also pleased to offer user-specific solutions.
Customers
- Energy supply companies
- Grid operators
- Facility management
- Operators of data processing centers
- Hospitals
Please check out our pre-configured standard models for power fault recording. Standard models meet approximately 80 % of all application requirements, are cost optimized and shipped faster.
Technologie AG