The connection heavy loads may lead voltage variations the short-circuit power point supply undersized. Several types faults are then defined: overvoltage, voltage dip, outage, etc. This set measurements will help the installation manager size the capacitor banks correctly. further complication the fact that electricity market deregulation could lead increase the frequency general network blackouts. The causes mainly lie the installation itself. The voltage amplitude crucial parameter for electricity quality. Electricity suppliers penalize consumers whose displacement power factor (cos phi DPF) lower than 0.Power, ENERGY AND DISTURBANCE
A phase analysis essential precisely identify the behaviour the installations and determine which solutions implement. Flicker: rapid voltage fluctuations. The disturbances called harmonics are caused connecting non-linear loads, such equipment incorporating power electronics, the network. Today's measurement instruments have capable performing this harmonic analysis order order, well measuring the Total Harmonic Distortion (THD) for more detailed diagnosis the installation. The quality requirements have become much more demanding and stringent than the past. measurement provides the foundation for optimizing your installations' energy efficiency, supervising your electrical networks and fairly allocating the costs. 10-minute interval considered acceptable compromise for evaluation the short-term flicker (Pst)... This may have instant consequences certain electronic equipment: operating problems (synchronization, switching), untimely tripping, measurement errors energy meters, etc.4 (in France). Some faults are encountered very frequently. The arrival new quick-switching components leading large number low-order harmonic currents (3, 11, . For private customers, reactive power neither measured nor billed separately. Electricity clean energy source and less harmful for the environment, but does affect nevertheless. All the equipment factories and buildings now includes digital electronics which are known sensitive micro-outages, peaks and dips, harmonics and disturbances general. When variable loads such arc furnaces, laser printers, microwave ovens air-conditioning systems are started up, they cause rapid voltage variations. This phenomenon called flicker. The voltage amplitude varies abnormally and may even drop level close zero. The rated network voltage variation range set the power distributor.
Power measurements
Power measurement key element for the definition, success and longterm effects energy optimization programme. Harmonics and interharmonics. The complexity industrial equipment makes vulnerable the voltage disturbances that occur the electrical network.
Electrical network analysers capable recording disturbances for industrial companies and professionals the electricity sector (producers, transmission companies, electricity users) are essential tools for satisfactory supervision and timely maintenance installations. The measurement duration defined then hours, time considered appropriate for the load operating cycle the time during which observer may sensitive long-term flicker (Plt). This current distortion implies distortion the voltage also depending the impedance the source. They have provide direct measurements, allow much parameterization possible for recording and facilitate subsequent analysis. Reducing electricity consumption also simple, painless way saving money. the combined effect several disturbance-generating loads operating random way (e. reality, the flicker value the result statistical calculation based measurements the rapid voltage variations. general, most disturbances are caused by: Slow and transient voltage variations.
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. The waveform the current consumed loads connected the electrical network often longer purely sinusoidal. Things are very different for industrial customers, however.
Detection disturbances
With the spread systems incorporating electronics using switching power supplies, the electrical network becoming increasingly polluted.). Instead included flat rate the active power price. the medium term, the extra heating caused this may reduce the life span rotating machines, capacitors, power transformers and neutral conductors. welding units motors) has taken into account when flicker sources with long variable operating cycles are involved (electric arc furnace), the resulting disturbance must assessed over longer time..g.93 (in France) whose tan phi higher than 0. The various parameters the installation are measured regularly, including the different power values used size the electrical network and the phase shift data, well the voltage, current and frequency measurements. The measurements made help ensure that the solutions are pertinent and that the gains achieved are maintained over the long term the context energy optimization programme
