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Do you mean "back-feeding"?
Normally a power transformer takes a primary voltage and steps it up or down (usually down) to a secondary voltage. However, Transformers are symmetrical; you can just as easily feed the secondary and generate the primary voltage.
This is particularly a problem with utility power distribution systems in a storm, such as a hurricane situation...
In a protracted power outage, some people are tempted to run backup generators to supply their inhouse loads while the utility company is effecting repairs. An intelligent user, one that reads the directions, will isolate the generator from the service distribution system so that it is impossible to back feed the service source.
Some people might ignore the directions and attempt to back feed their entire home. If they don't isolate the incoming mains breaker, this can back feed the distribution transformer and energize the primary line on the street, raising it to high voltage, such as 7620 volts.
This actually happened during Hurricane Gloria in 1985, and a utility worker was killed. Yes, the worker was At Fault for assuming that the line was dead, but the homeowner was also at fault for ignoring the directions that came with the generator.
Unless you have the proper equipment to synchronize, backfeed, and isolate your generator, DO NOT EVER DO THIS.
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∙ 12y ago
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What are precautions to be taken at the time of back charging of generator transformer?
Nothing. If your system can run your house while the main breaker to the power grid is off, then back charging will occur as a byproduct while the main breaker to the power grid is on and you are using less power than you are generating. During times of a power outage, you'll want to cut the main breaker to the power grid, so that your system doesn't try to power the entire neighbor hood.
What is the difference between power transformer and instrument transformer?
A power transformer is used to provide power (to your home, for example), an instrument transformer is used to measure voltage or current (for metering, for example).
What is Back to back test of a transformer?
Back to back testing of a transformer can be better explained if you check the diagram in the resource area.
How a rectifier transformer deffer from a power transformer?
rectifier transformer converts acinto dc.but,power transformer convert step up or step down ac energy without changing frequency
Bil of power transformer?
B.I.L. stands for Basic Impulse Level for the transformer. It should be on the faceplate of the transformer.
What are precautions to be taken at the time of back charging of generator transformer?
Nothing. If your system can run your house while the main breaker to the power grid is off, then back charging will occur as a byproduct while the main breaker to the power grid is on and you are using less power than you are generating. During times of a power outage, you'll want to cut the main breaker to the power grid, so that your system doesn't try to power the entire neighbor hood.
What is the effect of back charging of 250MVA 15.75KV 240KV generator transformer and how many times one can back charge the generator transformer?
Generator Transformer back-charging is done because of the following reasons:- 1. To ensure the healthiness of Generator transformer after performing all the transformer related tests before synchronising with the grid. 2. To ensure all the protections of transformer before putting it into actual operation. 3. To check the polarity, ratio & connections of transformer. 4. To check all the PTs & CTs in circuit & their availability to the relays for protection & metering. 5. To check Voltage level & polarity at LAPT. 6. To perform change-over operation checks of UATs & the tie breakers with main breakers. Since all the protection system related to relays acts in the same way for forward & reverse power, we check the availabilty of each equipment before final synchronisation with the grid.
What is meant by the term ideal transformer?
ideal transformer is that which has no power losses.if any transformer transfer power to secondary without power loss then that call a ideal transformer
What are the components required for charging mobile using sound energy or noise?
transformer
Is transformer an amplifier?
No. In an amplifier, Power Out > Power in. In a transformer Power Out ~= Power In (minus internal losses). An AC generator is more like an amplifier than a transformer.
What is the difference between power transformer and instrument transformer?
A power transformer is used to provide power (to your home, for example), an instrument transformer is used to measure voltage or current (for metering, for example).
What will happen you f the rated power of transformer is changed?
You cannot 'change' the 'rated power' of a transformer except by changing the transformer for another one. You can, though, operate the transformer below its rated power or, for short periods of time, operate the transformer aboveits rated power.
Can I exchange a 12V 400MA transformer with a 12V 1.25 amp transformer without damaging the unit?
if used for charging-NO if used for supply voltage-yes
How do you stop the charging of samsung laptop battery?
The way to stop your laptop from charging is to unplug the charger from the computer. When the battery starts to get low on power plug it back in.
What is meant by the term transform?
ideal transformer is that which has no power losses.if any transformer transfer power to secondary without power loss then that call a ideal transformer
Can you use a 12v to 240v step up transformer for a residential Electrical Vehicle charging station?
You would need to have a 12 v ac supply available to step it up to 230 v with a transformer. Please explain what kind of power supply you are working with so that an answer can be provided.
What is Back to back test of a transformer?
Back to back testing of a transformer can be better explained if you check the diagram in the resource area.
