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A line reactor acts not only as a current-limiting device, but it also filters the waveform and attenuates electrical noise and transients associated with the system. In situations where you have drives located very close to the incoming facility power source, such as a substation, they may be susceptible to any incoming spikes and other transients.
On the other hand, if you have drives located far from the facility power source (as often seen in hospitals), they may be affected by line harmonics caused by other harmonic-generating equipment (nonlinear loads). This phenomenon, known as long lead effect, can stress and consequently degrade the insulation around the stator windings of motors, resulting in shorter motor life. Where a motor, by necessity, is extremely far from its drive, you can install a high-frequency compensated reactor on the load side of the drive, either at the drive end or motor end, to help protect the motor from overvoltage, stress from PWM voltage pulses, overheating and resulting stator insulation degradation, while reducing the motor whine. By slowing the rate of rise of current, the reactor allows time for protection circuits in the drive to react to the short circuit and trip out safely, saving the IGBTs.
Looking at the load side reactor from the motor view, the ability of the reactor to filter the waveform produced by the VFD improves the performance of both the motor and the total system.
On the line side, reactors stabilize the current waveform, which reduces harmonic distortion and the burden on upstream electrical equipment. V-Tech Power Engineering offers Engineering, Procurement and Construction (EPC) of Thermal, Gas & Solar Power Plants, Petrochemical, Oil & Gas, Fertilizer, Steel, Cement, Sugar and Other Industrial Plants in India and Overseas. Design, Detailed Engineering, Supply, Fabrication, Erection and Testing of Structures, Piping, Storage Tanks, Vessels, Ducts etc. Supply, Fabrication and Erection of Coal Handling Plant (CHP) Equipments, Conveyor system, CW System Piping, Fuel Oil System, Water Treatment Plant System etc. Mechanical Erection of Boilers & its Auxiliaries, Turbine-Generators & its Auxiliaries, ESP & its Components, Coal Mills, Air Pre Heaters, HP & LP Piping Ash Handling System, Pumps & Motors Etc. Balance of Plant ( BOP ) a€“ Supply, Installation and Commissioning for Mechanical, Electrical and Instrumentation Work Packages for Power Plants up to 660MW. Installation and Testing of Electrical, Instrumentation and Control Systems including Transformers, Generators, Panels, Cables with Trays etc.
You must have JavaScript enabled in your browser to utilize the functionality of this website. April 5, 2013 - All Russelectric on-site power control systems are equipped with dual PLC controls for automatic generator set starting and stopping, status and alarm annunciation, synchronizing, and priority load control.

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You can install reactors in HVAC equipment, pumping equipment, machine tools, elevators, robotics equipment, ski lifts, wind generators, electric cars, cranes, and many other types of equipment, to extend the service life of the VFD and motor. As the name implies, you’d typically use line reactors on the line side of a VFD, as shown in Fig. This is because there may not be enough impedance to help counteract these transient voltage spikes (such as transformers, power feeders, ect.). Some have tried to compensate for the higher frequencies and harmonic currents present in the drive output waveform by over sizing the unprotected motor. The load reactor also acts as a current-limiting device to protect the drive under motor short circuit conditions. The reactor also absorbs current surges created by the motor load that might otherwise cause nuisance tripping of the drive. The installation of load reactors with drives and motors can reduce the high-frequency currents in the motor and protect the motor from long lead effects. By absorbing line spikes and filling some sags they can prevent overvoltage and under voltage tripping problems. A primary PLC controls system operation with a backup PLC running the same program as the primary, so if the primary PLC fails, the backup PLC assumes operational control. The motors comply with Australian electrical and mechanical standards and are subject to stringent quality controls. The award will support research into the use of new materials for power electronics to support sustainable technologies through a range of applications including the next generation of power grids. They provide customized solutions to the conversion of electrical energy through design of drives, controls, motors and generators. This situation can damage the front end (diode section) of the drives or cause nuisance overvoltage tripping on the system. Look for large nonlinear loads, such as VFDs, and apply a 5% impedance line reactor on the input to those pieces of equipment to minimize the system harmonics. Fast changing pulse-width modulation (PWM) voltage pulses in PWM drives can interact with the distributed inductance and capacitance of long motor leads. A general practice is to use a 5% impedance load reactor on the load side of a VFD when the motor lead length is greater than 100 ft.
While the higher frequencies did reduce motor noise, they also aggravated PWM pulse contribution to excessive motor-shaft voltage and current that can discharge across motor bearings.

Here, the line reactor slows the rate of rise of the short-circuit current and limits the current to an acceptable level.
Machine jams, multiple motor switching, and other application changes to the drive load cause motor load surges. Basically, the reactor attempts to recreate a sine wave, thus improving overall system performance, reliability, and efficiency. For example, when the utility switches power factor correction capacitors on the electrical power grid, it creates voltage spikes.
If both PLCs were to fail, a manual control system allows operating personnel to synchronize and parallel the generators onto the bus, as well as to add and shed load. Harmonic compensated line reactors are specially designed to handle the waveform’s harmonic content. Installing a 5% impedance line reactor at the input to each drive helps counteract line spikes, prevents tripping or damage to the drives. Typically, you can use two 5% impedance reactors in series (10% impedance) if the motor leads exceed 1,000 ft in length. VFDs that use insulated-gate bi-polar transistors (IGBTs) as high-frequency switches are most likely to cause bearing discharge current. The impedance of the reactor in the input circuit helps prevent these voltage spikes and virtually eliminates nuisance tripping of drives due to overvoltage. By inserting inductive reactance into the circuit, which is a high impedance to harmonic frequencies, line reactors reduce the amount of harmonics produced by a VFD system. In fact, the longer the cable length, the higher the peak overvoltage at the motor terminals. Tests have shown motor temperatures can drop as much as 68°F (more than double the motor life) when using a harmonic-compensated 5% impedance load reactor. For harmonic reduction purposes, you typically apply 5% impedance line reactors to the input of motor drives 20 hp and higher. All systems are UL listed and are designed and built in accordance with ANSI, IEEE, and NEMA standards.
This reduces input harmonics to 35% total harmonic current distortion (THID) or less and minimizes the effects of harmonics on motors and other devices powered off the same electrical system.

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