what is the working principle of contactor?
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Operating principle When current passes through the electromagnet, a magnetic field is produced, which attracts the moving core of the contactor. The electromagnet coil draws more current initially, until its inductance increases when the metal core enters the coil.
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Installation contactors and auxiliary relays are designed to switch more power (load) than the capacitance of the switching component. They are also used for so-called multiplication of contacts where more than one contact is needed. The auxiliary relays have quiet operation, LED signalling and switching contacts.
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The purpose of a tap changer is to regulate the output voltage of a transformer. It does this by altering the number of turns in one winding and thereby changing the turns ratio of the transformer. ... An OLTC varies the transformer ratio while the transformer is energized and carrying load.
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Tap changers. The purpose of a tap changer is to regulate the output voltage of a transformer. It does this by altering the number of turns in one winding and thereby changing the turns ratio of the transformer. ... An OLTC varies the transformer ratio while the transformer is energized and carrying load.
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EOT Crane Working Principle There are three working movements of EOT Crane- crane hook up and down lifting, trolley lateral movement and crane long travelling longitudinal motion. The motor exhibits a driving force of the hoisting mechanism. This transmits the power to high-speed shaft end.
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Thermistor Working Principle. The principle obeyed by the thermistor is its dependency on-resistance values on the change in temperature. The value of resistance can be measured by using an ohmmeter. These are connected in series with the battery and the meter.
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a circuit breaker is designed to break fault currents, e.g. 10,000 Amps. a contactor is designed to break load currents, e.g. 100 Amps.
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Principle : Ammonia detector works on electrochemical principle. ... Voltage, electrolyte and electrode material are selected to suit the gas being monitored so that it is transformed electrochemically on the measuring electrode and a current flows through the sensor. This current is proportional to the gas concentration.
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Low resistance ohmic contacts are used to allow charge to flow easily in both directions between the two conductors, without blocking due to rectification or excess power dissipation due to voltage thresholds.
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They work in accordance with the basic principle that P= F/A, where the pressure (P) acts on a known area of a sealed piston (A), generating a force (F). The force of this piston is then compared with the force applied by calibrated weights.
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There are three major parts of a contactor or relay: the coil, mechanical linkage and contacts. The coil is used to create a magnetic field and is rated based on voltage (24 V, 120 V, 208/204 V, 480 V). The mechanical linkage connects the armature to the contacts when the coil is energized, completing the circuit.
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The basic working principle of a vacuum tube is a phenomenon called thermionic emission. It works like this: you heat up a metal, and the thermal energy knocks some electrons loose. ... When the cathode is heated, and a positive voltage is applied to the anode, electrons can flow from the cathode to the anode.
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The working principle of the Electrodynamometer Wattmeter is very simple and easy. Their working depends on the theory that the current carrying conductor placed in a magnetic field experiences a mechanical force. This mechanical force deflects the pointer which is mounted on the calibrated scale.
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The working principle of an LDR is photoconductivity, that is nothing but an optical phenomenon. When the light is absorbed by the material then the conductivity of the material reduces. When the light falls on the LDR, then the electrons in the valence band of the material are eager to the conduction band.
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The Knock Sensor A working principle to piezoelectric elements involves the transmission of an electrical current in response to detecting a change in pressure or vibration by these elements. The piezoelectric element inside the knock sensor is tuned to detect the engine knock/detonation frequency.
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A Motor Starter is a basically a contactor with the addition of an overload relay which will drop out the coil voltage in case of motor overload condition. A Contactor is an electrically control switch same as a relay. It is used for switching the current to ON and OFF a circuit.
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A dry contact, also called a volt-free contact, is a relay contact that does not supply voltage. The relay energizes or de-energizes when a change to its input has occurred. In other words, a dry contact simply detects whether or not an input switch is open or closed.