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The mains of the world were constructed as a giant copper causeway to transport electricity from the generating station to our homes and factories.
Multisim transformer full#
Torus Power with NBT can restore your audio and video to it’s maximum potential and offer full enjoyment pleasure. Poor power quality is especially detrimental to entertainment systems, and causes adverse effects and discernably inferior performance on audio and video systems.
Multisim transformer series#
This technology eliminates series inductors and filter capacitors in the primary circuit. NBT transformer design carefully balances the inherent inductance, capacitance, and resistance characteristics of the toroidal transformer, enabling the transformer to act as a very effective low-pass filter. No other external components are required. Torus Power Toroidal Isolation transformers restore incoming power to its clean original state using Plitron’s NBT transformer technology. NBT can be adapted to most transformer-based power applications. It is very effective for attenuating high and high frequency signals whether the origin is on the line or generated due to asymmetrical loads. This patented technology gives the transformer the ability to dampen distortion on the line due to harmonics and spikes. NBT transformers restrict electromagnetic energy to a very narrow passing frequency band. NBT reduces line distortion within isolation or power transformers. NBT harnesses the transformer’s inherent L, C, and R components as a tuned low pass filter, and requires no other external components to attenuate unwanted noise from the mains. Narrow Bandwidth Technology (NBT) is transformer based filtering system that removes noise and harmonics from the incoming power lines that protects your equipment and ensures it is supplied with clean sinusoidal power to achieve it’s maximum performance. Large dphi/dt produced at flux inversion generates high voltage spikes (250 V).What is Narrow Bandwidth Technology? (NBT) The flux has a square waveshape chopped at +10 and -10 pu. Restart the simulation and observe the large overvoltage produced when the CT secondary is opened. Reprogram the primary breaker closing time at t = 1.25/50 s (no flux asymmetry) and change the secondary switch opening time to t = 0.1 s. However, after 3 cycles, the flux asymmetry produced by the primary current causes CT saturation, thus producing large distortion of CT secondary voltage.ģ. The CT voltage output V2 then follows the primary current. Observe that for the first 3 cycles, the flux stays lower than the saturation knee point (10 pu). This switching instant will now produce full current asymmetry in the shunt reactor. Now, change the breaker closing time in order to close at a voltage zero crossing. The flux contains a DC component but it stays lower than the 10 pu saturation value.Ģ. As expected the CT current and voltage are sinusoidal and the measurement error due to CT resistance and leakage reactances is not significant. Start the simulation and observe the CT primary current and secondary voltage (first trace of Scope block). This switching produces no current asymmetry. In this test, the breaker is closed at a peak of source voltage (t = 1.25 cycle). This switch will be used later to illustrate overvoltages produced when CT secondary is left open. The switch connected in series with the CT secondary is normally closed. The CT flux, measured by the Multimeter block is converted in pu and sent to trace 2. The primary current reflected on the secondary and the voltage developed across the 1 ohm resistance are sent to trace 1 of the Scope block. The CT is assumed to saturate at 10 pu and a simple 2 segment saturation characteristic is used. Open the CT dialog box and observe how the CT parameters are specified. In steady state, the current flowing in the secondary is 1000*5/2000 = 2.5 A (2.5 Vrms or 3.54 Vpeak read by the voltage measurement block V2). A voltage sensor connected at the secondary reads a voltage which should be proportional to the primary current. The secondary winding consisting of 1*2000/5 = 400 turns is short circuited through a 1 ohm load resistance. The primary winding which consists of a single turn passing through the CT toroidal core is connected in series with the shunt inductor rated 69.3 Mvar, 69.3 kV (120kV/sqrt(3)), 1 kA rms.
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A current transformer (CT) is used to measure current in a shunt inductor connected on a 120 kV network.