M19 Lab: Reactance and Impedance Roger Argo ECEN 150 Introduction: Purpose: 1. Practice calculating reactance and impedance. 2. Observe the phase shift between voltage and current caused by reactance and impedance. 3. Learn how to make AC voltage phase shift measurements with an oscilloscope. 4. Become more familiar with laboratory instruments and reading instrument operating manuals. Equipment / Materials 1. 0.1 UF Capacitor 2. 1 Kilo ohm Resistor 3. Oscilloscope 4. Generator
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OBSERVATION The modicom 1 board‚ first in my observation is the power input these are the electrical input connections necessary to power the module. The LJ Technical Systems’ "I.C. Power 60" or "System Power 90" is the recommended power supplies. Then second is the sampling control logic is the circuitry generates the timing and control signals that sample the input waveform‚ and also creates a sinusoidal 1 kHz signal for use during the MODICOM 1 practical exercises. It is recommended that this
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Power‚ EAF. I. INTRODUCTION OLTAGE flicker is mainly caused by rapid change of loads in power systems‚ such as electric arc furnaces (EAF). During the operation of an EAF‚ the electric poles short circuit and an enormously unstable current is produced‚ causing current flow to change significantly‚ and in turn causing serious voltage flickers that influences neighboring power consumers. According to IEEE Std-100 [1]‚ voltage flicker is luminosity variation or an image disruption caused by lower frequency
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GRAPHS § § § § § § Elements – line segments in a graph that represent network components. Nodes – the terminals of the line segment. Incident node and element – if the node is terminal of the element. Graph – shows the geometrical interconnection of the elements of a network. Subgraph – any subset of elements of a graph. Path – a subgraph of connected elements with no more than two elements connected to any one node. § Connected graph – if and only if there is a path between every pair of nodes.
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Wire Symbols Electrical Wire Conductor of electrical current Connected Wires Connected crossing Not Connected Wires Wires are not connected Switch Symbols and Relay Symbols SPST Toggle Switch Disconnects current when open SPDT Toggle Switch Selects between two connections Pushbutton Switch (N.O) Momentary switch - normally open Pushbutton Switch (N.C) Momentary switch - normally closed DIP Switch DIP switch is used for onboard configuration SPST Relay Relay open
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CURRENT PROTECTION FUNCTIONS ANSI 50/51 – Phase over-current ANSI 50N/51N or 50G/51G – Earth fault or sensitive earth fault ANSI 50BF – Breaker failure ANSI 46 -Negative sequence / unbalance ANSI 49RMS – Thermal overload CURRENT PROTECTION FUNCTIONS ANSI 50/51 – PHASE OVERCURRENT Three-phase protection against overloads and phase-to-phase short-circuits. ANSI 50N/51N OR 50G/51G – EARTH FAULT Earth fault protection based on measured or calculated residual current values: ANSI 50N/51N:
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UNISONIC TECHNOLOGIES CO.‚ LTD S8050 LOW VOLTAGE HIGH CURRENT SMALL SIGNAL NPN TRANSISTOR DESCRIPTION The UTC S8050 is a low voltage high current small signal NPN transistor‚ designed for Class B push-pull audio amplifier and general purpose applications. 1 NPN SILICON TRANSISTOR FEATURES * Collector current up to 700mA * Collector-Emitter voltage up to 20 V * Complementary to S8550 Lead-free: S8050L Halogen-free: S8050G TO-92 ORDERING INFORMATION Normal S8050-xx-T92-B S8050-xx-T92-K
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conductive path for the current. Consequently this phenomenon might damage the contacts of the switch over time. (We assume that the switch used in this circuit is rated at only 100 Vdc). FIGURE 3 From Figure 3: A diode in series with a resistor is connected across the inductor to resolve the arcing phenomena across the switch. At t 0‚ when the switch is opened‚ the diode is forward bias hence allowing current to its branch. The current‚ I in this circuit is then
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The modern steel plant receives low current‚ high voltage power from the generators of the electrical utility company. The purpose of the steel plant primary transformer is to step-down this voltage. The transformer thus provides high current‚ low voltage power for the EAF furnace. Large furnaces with transformers rated at 100MVA or higher is not uncommon. There are usually two stages to this process. The transformer first steps-down the voltage from high to medium levels. There are different
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any of the nonconductive items suggested for lifting a live wire so that the current doesn't pass from the child's body to yours. Once the current is off‚ quickly check the child's breathing‚ pulse‚ skin color‚ and alertness. If the child isn't breathing or there is no heartbeat‚ begin CPR immediately while someone else goes for medical help. Once the child is safely removed from the current‚ check him for burns and your local emergency number‚ or your pediatrician right
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