Reverse Supply

Reverse supply or also called Backfeeding is the flow of electric power in the direction reverse to that of the generally understood or typical flow of power. Depending on the source of the power, this reverse flow may be intentional or unintentional. If not prevented (in the case of unintentional backfeeding) or properly performed (in cases of intentional backfeeding), backfeeding may present unanticipated hazards to electrical grid equipment and service personnel.

>> Causes
1. Hooking up battery backwards (wrong polarity)
2. Accidental short circuits.
3. Faulty Capacitor or higher load than rated load can cause capacitors to reverse supply.
4. UPS stores energy and due to various reasons like harmonic filter damage or less load can cause UPS to give back the power to the grid.

Vampire Energy

Devices like televisions, microwaves, scanners, and printers use standby power, even when off. Some chargers continue to pull small amounts of energy, even when plugged in (a good judge of this is if a charger feels warm to the touch). Studies have found that vampire energy loads account for 5-10% of the total electricity in residential homes and accounts for about 1% of the world’s carbon dioxide emissions.
>> Take these actions to avoid paying for these vampire energy drainers
  1. Unplug electronics, chargers, and appliances when not in use.
  2. Set electronics to energy save mode; turn your monitor off when you step out. 
  3. Use a power strip to turn all devices off at once


Neutral Current

The more the system is balanced, the less current is in the neutral. If the three-phases have the same amount of current in them, then the neutral current would be zero.

High neutral currents in Industrial and Commercial premises usually result from two situations. The first, and most common, is one where there are simply heavily unbalanced loads. The second situation involves current harmonic distortion i.e. whenever the current in the power system is no longer sinusoidal.

>> Unbalanced Load Solution
  1. Using Oneunit app, determine 3 phase unbalanced currents.
  2. Rewire or relocate devices to bring balance in the system.
>> Harmonic distortion solution
  1. Using Oneunit App, Check harmonic distortions of the entire premise.
  2. Use a passive filter to reduce the current from one or two specific harmonics.
  3. Use an active filter to reduce all the harmonic currents. It is more costly and complex to use, but it works better than passive filters.
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