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generally open circuit test is performed on the low voltage side.....not on high voltage side.... becuase on low voltage side, we can apply that low voltage very easily ( i.e with a less amount of source is required)... whereas on high voltage side, we need a large power source in order to apply full voltage... in short circuit test, we will test on high voltage side by keeping Low voltage side being short circuit.because high voltage side needs less current source than low voltage side....
Wiki User
∙ 14y ago
Wiki User
∙ 14y agoSometimes short circuit tests are performed by applying voltage to the low voltage side of a transformer because a lower voltage must be produced to satisfy the testing parameters (i.e. it takes cheaper equipment to do the test).
Wiki User
∙ 12y agothe voltage required to produce the rated short circuit current will be only 1/10 of the rated voltage.so in order to have a measurable value of voltage while conducting sc test the test should be conducted on HV side .If it is done on LV side the voltage will be inconveniently small practically.
Wiki User
∙ 11y agoDuring open ckt test high voltage side is kept open because for the safety reasons .
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Why rated voltage is to be applied to primary for open circuit test?
Open circuit test on a transformer is usually performed to measure the IRON losses.Iron losses are produced due to eddy current and hysteresis losses. In open circuit test, the LV side, generaly the secondary winding, is kept open and the HV side, generaly the primary winding is fed with the rated voltage and frequency. The rated voltage is applied in order to setup normal flux in the transformer, which in return further produces the normal iron losses at rated voltage. the wattmeter connected at the primary side will show the power consumed due to iron losses. this calculation further utilized for determing the efficiency of transformer.
Why were instrument of a transformer placed on a high voltage side in short circuit test?
I assume "tension" in this question should be replaced with "voltage". Short circuit tests are often performed from the lower voltage side of the transformer, since a lower voltage source is then required to perform the test. Often times the test lab may not have a source that can output a high enough voltage to perform from the high voltage winding.
What is a unilateral circuit?
Unilateral circuits is consists of unilateral elements which allows the current flow in only one direction. It applies the electricity from one side to the other side just like an open circuit.
What is the resistance when switch is open?
Nothing will happen to the resistance of the circuit. However, with the switch open, it will be 'seen' as having infinite resistance from the supply side.
Why do you use isolator on both side of circuit breaker?
Opening a circuit breaker merely interrupts the current flowing through that circuit. It doesn't remove the voltage from the circuit breaker. Isolators (called 'disconnects' in North America) place a visible gap between the circuit breaker and energised conductors, allowing work to be performed on the circuit breaker safely. The full procedure involves: 1. Tripping the circuit breaker (CB). 2. Opening both isolators. 3. Applying temporary earth (ground) connections on either side of the CB. 4. Placing barriers and warning signs around the CB. 5. Issuing a permit to work card to the maintenance supervisor.
Where is the high side of transformer on open circuit test?
high voltage side call primary
Why does a phase in secondary side in distribution transformer give low voltage?
transformer is busted; if input voltage is normal you have short circuit or open circuit somewhere
Why is open ckt test conducted on lv side?
in the open circuit test, the high voltage winding is open circuited and the measurements are made on the low winding side i.e, the open circuit test is performed on the L.V side. This is because if the measurements are made on HV side then voltage applied must be large and the current would be unsuitably small, for which the high voltage sources may not be readily available and at the same time the instrument ranges required should be very high, Also the result obtained may not be accurate. NOTE: iron loss will be same, if measured from either of the winding. in short circuit test. the low voltage winding is short circuited and the measurements are made on the high voltage winding side i,e,. the sort circuit test is performed on H.V side. This is because if the test is performed on the L.V side, the current will be suitably large for which the instruments used should be of very high ranges. moreover instruments of such high ranges and the auto-transformer capable of handling such high currents may not be readily available.
Why rated voltage is to be applied to primary for open circuit test?
Open circuit test on a transformer is usually performed to measure the IRON losses.Iron losses are produced due to eddy current and hysteresis losses. In open circuit test, the LV side, generaly the secondary winding, is kept open and the HV side, generaly the primary winding is fed with the rated voltage and frequency. The rated voltage is applied in order to setup normal flux in the transformer, which in return further produces the normal iron losses at rated voltage. the wattmeter connected at the primary side will show the power consumed due to iron losses. this calculation further utilized for determing the efficiency of transformer.
What would be the most effective method to test a broken circuit?
Do a voltage test. Start at one end of the circuit and progress along device by device. If there is voltage on the down stream side of the device move on to the next. If there is no voltage on the down stream side of the device then go up stream of the device. If you have voltage there then the current device that you are at is the problem causing an open or broken circuit.
Why high voltage is kept open in open circuit and low voltage is shorted in short circuit test?
In Short circuit test High Voltage side is feeded with 2-5% of the High Voltage rating to circulate approximately full load current in low voltage winding by short circuiting it. Low voltage is generally short circuited to facilitate measurements because it is more difficult to measure the quantities at high voltages.
Why does a low voltage circuit create more amperage than a high voltage circuit?
That depends on what you mean. If you mean why does a circuit which has a high voltage side and a low voltage side have a greater average current on the low voltage side, it is probably because of power conservation: P = IV. If this is not what you mean, you will have to be more specific!
What will happen to the transformer if double the rated voltage is applied to the winding during the open circuit test?
no voltage will be induced on the secondary side of the motor as the windings will become saturated.
Why is an open circuit test performed on the low voltage side of a single phase transformer?
You always need to apply rated voltage to the primary in open circuit test (oc test helps to find iron loss which depends on the voltage applied which remains constant)so with smaller voltage applied to the low voltage side rated voltage can be achieved in primary.Further,the ammeter ,voltmeter and wattmeter connected to the primary can be of lower rating.
Is the neutral wire energized when the appliance is off?
No current flows in the circuit when the circuit is open, as in when the appliance is switched off. The voltage is on the "hot" side of the switch when it is in the open position but the neutral is not energized until the switch is closed.
Why short circuit test is done at high voltage side?
1)Short circuit test is performed at rated current. As the rated current on high voltage side is much less than low voltage side, so the rated high voltage side current is easily achieved compared to low voltage side. 2)Also because we cannot short circuit high voltage side, as, if we short circuit high voltage side, voltage of high voltage side essentially falls to zero and since VI=constant, so the high voltage side current will be very high and will burn the winding.
Why were instrument of a transformer placed on a high voltage side in short circuit test?
I assume "tension" in this question should be replaced with "voltage". Short circuit tests are often performed from the lower voltage side of the transformer, since a lower voltage source is then required to perform the test. Often times the test lab may not have a source that can output a high enough voltage to perform from the high voltage winding.
