EN Caratteristiche della tensione fornita dalle reti pubbliche di distribuzione utilizzare un registratore conforme alla CEI EN In questo. Power quality has many meanings depending on what the power is used for. • Measuring PQ is all about deviations from normal state. • USERS. of European Norm Some countries have used EN as the basis for their national quality of supply regulations. But the standard’s statistical models.
|Published (Last):||26 September 2013|
|PDF File Size:||7.35 Mb|
|ePub File Size:||20.41 Mb|
|Price:||Free* [*Free Regsitration Required]|
The tests were done in order to verify the parameters of robustness and reliability of the measuring instrument. For communication between two microcontrollers a serial protocol has been implemented between pin 25 tx of the processing pic, and pin 26 rx of the network management pic.
Similarly, the failure was simulated upstream of the monitoring point. The calculation of the phase follows the same logic of the frequency detector of the PLL VCO where the samples were replaced by the current samples measured: The standard EN  defines, describes and specifies The most influential standards in the field of power quality the main characteristics of the voltage in low, medium and are EN and IEC The wireless solution adopted, based on the Zigbee protocol, together with the choices made of the measuring devices and processing makes the measurement system achieve a good compromise between good performance and very low costs.
Metrel d.d. – Power Quality Analysis
Help Center Find new research papers in: One of the objectives pursued in the design was to obtain the flexibility of the module, in order to be used for different measurements. 501160, once the grid voltage is distorted, a linear load absorbs a distorted current.
On cej measurement point the operating characteristics of the node you are monitoring are acquired in real time: Here all the signal processing is performed, pre-treated and sampled at a frequency of 4 kHz, which is necessary for the study up to the 40th harmonic, as indicated by the CEI EN In this article, an overview of the main disturbances affecting the electrical power system operation has been presented.
Circuits and Systems,Proceedings. Overcurrents contribute to the lowering of the voltage level because the latter is a function of the voltage drops through the components of the network. Finally, we xei working on a new version of the sensor’s prototype that will significantly reduce its size, consumption and costs. In case of capacitive loads, for which therefore the reactive power is generated and its direction is opposite to that of reference for the active power, the situation is similar, but in case of event downstream is not sufficient, there is a positive deflection of reactive power, but this will also change its sign.
The purpose of the project is to create a network that can monitor systematically the power quality of a site. Aspects of metrological calibration of power quality analyzers.
CRC Press,  C. The display interval of events is constant and equal to 1 s. The sags may affect one or more stages depending on the phenomena that cause them.
The signal source is the power quality calibrator Fluke A, a programmable source of stable voltage and current waves, distorted by harmonics, flicker, interharmonics and other e fig.
The arising mainly from the lack of clear theoretical and practical phenomenon definitions, studies of related 51060 and measurement specifications, both in standard wn well as in measurement instruments and proposal of new standards in literature , . The insertion of the disturbance is set for all events at time 0,2 s. All the events mentioned above, at a certain instant, cause an increase in the current in the network.
The acceptability of the deviations from the nominal characteristics of the energy depends on the type of use by the user, the equipment installed and its needs.
To ensure the quality of the energy supplied to the point of delivery is not easy, and there is no way to withdraw electricity. It has also added a switch between the two serial outputs of cwi pic so you can monitor via the PC the. The algorithm discussed above is implemented within the sensors network in order to obtain a distributed measurement system to detect the directionality of sags.
Aspects of metrological calibration of power quality analyzers | George Seritan –
The measurement uncertainty estimation looks into account quantities presented in Table V. Some processes are profoundly affected even by very short breaks, for example:.
As you can see the first node F brings the ceu of the network at the point of measurement, and the variables related to the load from which it cie possible to obtain a complete characterization: Ten measurements were made for each With uncertainties A and B type, determined for each point set in calibration protocol in order to evaluate the component of eq.
This method has been cek within a network of sensors for a distributed measurement, and it will be illustrated in more detail in the following paragraphs. Similarly, it has been simulated the insertion of the same motor upstream of the PQ monitoring point. The measuring points are numbered in a consecutive way, starting from 1 for measurement point close to the point of delivery.
Processing of Reactive Power: We are now developing the second stage of the project consisting of designing and building the sensors network. Also, a ruined or defective wiring increases the impedance of the system and therefore it amplifies the phenomenon.
Click here to sign up. In short, the voltage distortion affecting the grid at a certain location depends on the value of the short-circuit current of that point. The following are the most interesting values Table 2.
The load ‘victim’ will maintain its phase angle, but the voltage on it will decrease, and, in a more or less relevant way, the current value will decrease 5016. A cause of troubles is not only long interruptions. The transmission stage consists of a dedicated pic of the same family of the processing picwhich is implemented by the transmission protocol of ZigBee.
A method for determining location of voltage fluctuations source in electric grid. Another direction deals with getting new waveform amplitude in steady state regime.