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Power Fault RecordingMonitoring Power Supply of Electrical Railway Systems
Nowadays, the electrical energy supply of railways is in many places autonomic and disconnected from the classical railway business. Modern energy service companies also have a clear separation of electrical energy supply and transmission in this case. These transmission companies work in the same way as all grid companies and are subject to similar market regulations. The railroad network is often used by other locomotive operators. These compete against each other and against the railway companies. A free market has developed with defined regulations. For energy supply this means that these companies have recently become service providers in the field of energy supply, have customers, distribute and transmit current and have to obey similar product liability law as do conventional energy service providers. Power quality has also become a keyword in this field.
Task
On the one side, transformer stations in railroad networks provide transformation and transmission of electric energy from customer generation to other sub-plants. On the other side, they are often connection points between the original railroad networks (overhead traction line) and a pre-located public power supply.
Thus, there are explicit property lines of electric energy and the supplier must assure power quality (service reliability). Monitoring systems for power supply of electric railroads can provide clear information on the voltage waveform. Railroad networks often have other frequencies than public networks (16.7 Hz, 25 Hz, DC etc.) and are furthermore not synchronous.
On the one hand, the network operator is interested in voltage quantity, harmonics, power flow direction, reactive power flow and on the other hand, in conventional disturbance records. A system that unifies all this, that can observe differently frequent power grids at the same time and that can take use of modern communication systems is required in this case.
Solution
Hardware
Due to very different requirements of individual transformer stations a very flexible and basic hardware system is necessary. Based on the DEWE-818-PFR systems these requirements can be fulfilled. Arbitrary numbers of channels, easy change of voltage and current input channels, user-friendly maintenance and cascading possibilities characterize this instrument group. Moreover, highest EMC standards are necessary. Differential input channels, isolated circuits and secure current paths are guaranteed by the DAQP-HV and DAQP-LA module. For portable applications we offer module based DEWETRON instruments among which the DEWE-2600-PM is the most qualified and applicable one.
Software
The measurement software DEWSoft combined with the analysis package PMT fulfils all requirements of a monitoring system for power quality in railway networks.
- U,I
- P, Q, S, cosPhi
- Fundamental components
- Harmonics, THD, K-factor
- Flicker (50 Hz)
- Fault records
- 3~ systems
- 2~ systems
- Differently frequent systems on one data acquisition system
- Flexible reporting system
- Monitoring can be done while being on any plant location
- Remote maintenance
- Time synchronisation via LAN or GPS
Customers
- Operators of railroad networks
- Plant manufacturer
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