What would you like to do?
Are high voltage tests on current power transformers recommended and if not why?
Hi-pot and megger tests are common to check the insulation on transformers, motors, refrigeration compressors, etc. They help check the condition of equipment to avoid a future falure. High votage test are conducted in current transformers by shorting the seconday and earth,can apply 3 times the rated voltage
Was this answer useful?
Thanks for the feedback!
connect 3 - phase supply to transformer primary winding.....keep transformer secondary winding open..... apply 3-phase voltage i.e.400v ac, and measure the amount o…f current flowing in each phase of the transformer primary winding...this current is the transformer magnetising current..... we can keep multimeters in series with the source....so we can measure directly the current readings.....(keep multimeters in current mode, and generally magnetising current will come in terms of milli amps for 400 v )
For any given load, the higher the supply voltage, the lower the resulting load current. A lower load current results in an acceptable voltage drop along the line, that conduc…tors with lower cross-sectional areas can be utilised, and line losses are minimised. So high voltages are essential for energy (not 'power') transmission.
The wire used to transmit the electricity has a specific resistance per unit length. Since power is equivalent to I^2 * R, the power loss in the wire becomes greater as th…e current increases, which results in less energy to sell. It's more economical to transmit power at very high voltages because of this energy loss. Answer For any given load, the higher the supply voltage, the lower the load current. It's necessary, therefore, to transmit/distribute electrical energy at high voltages to minimise voltage drop along the cable, to reduce line losses, and to enable cables of practical sizes to be used. T
Why During transmission of power it is transformed as high voltage rather than high current how is this possible as current and voltage are directly proportional?
Voltage and current are actually inversely proportional to one another. The formula P=IV is what you need to look at here, where P is Power, V is voltage, and I i…s current. Rearranging the equation you will see that V = P/I. You can see that if you increase voltage, while holding power constant, current is reduced. Now, to your question. The losses on a transmission line are proportional to the current flowing on the line, so transmitting at high voltage (and hence low current) is beneficial as it reduces the amount of power that is lost due to resistance in the line itself.
The High voltage transformer allows the microwave to run using the magnetron. With ony 120v to the magnetron, the cooking will be like with a 50-100W microwave. The high curre…nt is to manage current to the MOT with out oveheating while delivering current to the other parts of the microwave A CT. and PT. are required for any service enterance distributions over 200 amps. The CT's maximum amperage output is 5 amps and the PT's output is usually 120 volt in North American installations. These two values are inputted into a Watt hour meter. The total on the meter is then calculated by the utility company's rate and a bill for use is sent to the customer.
Current Transformers cannot be used as a voltage transformers, they are used to measure large electrical currents. They are manufactured in the shape of a dough nut, round wit…h a single hole in the middle. The conductor carrying the current passes thru this hole. the CT has two terminals, these would be connected to a ammeter or can be shorted together. When they are shorted together you can use a standard clamp on ammeter by passing the wire shorting the CT terminals together thru the meter jaws. The CT is sized by ratio of turns for the current is measuring, standard ratios of 200 to 5 or 500 to 5 .So if you were meassuring a current of 200 amps, your clamp on meter would read 5amps. A panel ammeter would be set up to display the amps as 200 amps. Current transformers, when installed should always have their ouput termianls shorted together or attached to an ammeter, to do so otherwise will damage the CT. No. A transformer is simply windings on a core, and simply changes the voltage of a signal. It doesn't add power, so as the voltage goes up, the amperage goes down, maintaining constant power (minus losses). In my mind, an amplifier adds power.
A current transformer is a transformer that takes a ratio of primary current, and delivers this ratio to the secondary. The voltage across the primary will be insignificant, a…nd the voltage across the secondary is dependent upon the resistive burden put across it (since the current is a constant ratio of the primary current). A voltage transformer is a transformer that takes a ratio of primary voltage and steps this down to a specific secondary voltage. Primary current is typically very small and secondary voltage is typically very small. A power transformer is a voltage transformer that is designed for "large" primary and secondary currents.
What would be the power in the secondary of a transformer that has a voltage of 48 vac and a current of 2.2 a?
48*2.2 = 105.6VA
A step-up transformer.
Yes Anyways You need thin copper wire, the thinner the more voltage output. Tear the secondary out of the transformer (The thicker wire) and save it for another project. Now w…ind the thinner wire where the thicker wire was and do it at about 1-2 volts added output per wind. Make sure you know where the two ends of the coil are and use the one end where the primary end is. Take the 2nd end of the new coil and put it on the other side. This is your output. No, a CT can not be used as a PT. They are two different types of transformers that are designed to do two specific operations in relation to voltage and amperage monitoring.
A common meter cannot withstand high voltage current if it is not rated to do so it will be damaged due to excessive current
A transformer works through mutual induction, whereby a changing current in one coil induces a voltage into a second coil. The transformer winding (coil) connected to the sup…ply is termed the primary winding, while the winding connected to the load is termed the secondary winding, and it is the ratio of the turns in each of these winding that determines whether the transformer is a step-up transformer or a step-down transformer. For example, if the secondary winding has twice as many turns as the primary winding, then the secondary voltage will be twice the primary voltage. The secondary current, which is determined by the load, determines the primary current by the reciprocal of the turns ratio. So, in the above example, the primary current will be twice the value of the secondary current.
H.V.test carried out by Keeping L.V.side short cktd. & supply will be provide to h.V. side
because it needs to explode
A transformer is used to step up (increase) or step down (decrease) an alternating voltage with very little loss of energy.
An ideal transformer (one with no losses, and not a bad approximation for the real thing) has an input power equal to its output power. In simple terms, since power is the pro…duct of voltage and current, then for a given value of power, as the voltage goes up, the corresponding current will go down.
A high dc voltage would be applied to test the insulation between the windings.