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An autotransformer is different from a "normal" transformer in that it uses the same winding for both input and output, with a tap somewhere along the winding for an additional connection for the input or output (whichever is the smaller value).
When an autotransformer is configured to output a lower voltage than the input, the input AC line is connected to the ends of the winding and the output line is connected between one end of the winding and the tap at some midpoint that is proportional to the difference between the input voltage and the desired output voltage. The input voltage induces a magnetic field in the core, and the magnetic field then induces a voltage between the tap and the common end of the transformer. To use an autotransformer to output a higher voltage than the input, the input is connected between the tap and the common end, and the output is connected between both ends.
Autotransformers are most often used as variable Transformers with a sliding tap that runs along the outside of the winding which is wound around a toroidal core. Moving this tap changes the output voltage of the transformer. A major disadvantage of the autotransformer is that it doesn't completely isolate the output side from the input side, and dangerous voltages and currents can appear on the output side, especially DC voltages and currents which can travel through the coil unimpeded.
To automate the voltage without the Network controller. Different times of the day the MVAr Gains and losses on the system affect the voltage due to loading. midday, more current, night time, less current. etc.
Auto transformers are often used in substations for step up/step down where the ratio of high to low voltage is small (less than 4). These are used because they are significantly smaller than a wye/wye, which translates into cost savings.
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Can you use ordinary transformer in place of auto transformer?
yes we can place auto transformer in place of original transformer
Type of transformers used in gas insulated substation?
Current transformer and voltage transformer . This transformers are actually measuring instruments which measures the quantity of current and voltage coming out of the substation.
What does a primary substation do?
Primary substation - when the transformer is HV/MV or MV/MV. e.g. substation designed for 132kV/33kV or 230kV/22kV or 33kV/11kV etc stepped down for MV distribution (mainly for utilities and heacy industries) Secondary substation - when the transformer is HV/LV or MV/LV. e.g. substation designed for 11kV/400V or 6.6kV/400V etc stepped down for LV distribution (mainly for residential, commercial) sometime referred to as a kiosk substation.
Can a a electric substation in a city use transformers to increase the power output?
No! A transformer changes voltage levels, not power levels. In fact, the output power of a transformer is actually a little lower than its input power, due to the efficiency of a transformer.
Why auto transformer is lighter than conventional type?
because the copper is saved in the auto transformer that is the ratio of weights of copper in auto transformer to normal transformer is (1-(1/a)) where a is transformer ratio
What is the main function of a current transformer in switchyard substation?
use of CT
Can you use ordinary transformer in place of auto transformer?
yes we can place auto transformer in place of original transformer
Why the capacitive voltage transformer and voltage transformer both are used in a substation?
three phases
Type of transformers used in gas insulated substation?
Current transformer and voltage transformer . This transformers are actually measuring instruments which measures the quantity of current and voltage coming out of the substation.
What do you mean by package substation?
Prefabricated power distribution substation Its basically a whole 11kv substation but in one unit. It contains a transformer, ring main unit, fuse board and circuit breakers etc. It still uses as much space as a normal substation that houses a separate transformer, ring main unit etc but is easier to transport and is probably cheaper.
What does a primary substation do?
Primary substation - when the transformer is HV/MV or MV/MV. e.g. substation designed for 132kV/33kV or 230kV/22kV or 33kV/11kV etc stepped down for MV distribution (mainly for utilities and heacy industries) Secondary substation - when the transformer is HV/LV or MV/LV. e.g. substation designed for 11kV/400V or 6.6kV/400V etc stepped down for LV distribution (mainly for residential, commercial) sometime referred to as a kiosk substation.
Can a a electric substation in a city use transformers to increase the power output?
No! A transformer changes voltage levels, not power levels. In fact, the output power of a transformer is actually a little lower than its input power, due to the efficiency of a transformer.
What is pocket substation?
the pocket substation have three major parts and they are transformer , ring main unit (RMU) and low voltage distribution bored (LVDB).
What is the capacity of power transformer for 132kva substation?
A 132 kV substation is normally called a grid substation. It would normally use two or more 132/33 kV transformers rated at 90 MVA, or two or more 132/11 kV transformers rated at 30 MVA.
Why auto transformer is lighter than conventional type?
because the copper is saved in the auto transformer that is the ratio of weights of copper in auto transformer to normal transformer is (1-(1/a)) where a is transformer ratio
Why would you use a three phase transformer in place of a single phase transformer?
the necesscity of two three phase transformers operating in parallel are as follows...if the one transformer fails to give supply,then another transformer can be used in parallel and hance,continuity of supply can be maintained.one transformer can be easily take out from the supply for repair & maintanance.if the load on the substation increases beyond the rated values of transformer, then another transformer can be used to share rhe load of the substation.
What do you mean by packages?
Prefabricated power distribution substation Its basically a whole 11kv substation but in one unit. It contains a transformer, ring main unit, fuse board and circuit breakers etc. It still uses as much space as a normal substation that houses a separate transformer, ring main unit etc but is easier to transport and is probably cheaper.
