The box transformer switch does not respond when the energy storage is pressed

About The box transformer switch does not respond when the energy storage is pressed

Unlike a forward-topology transformer (where the primary and secondary windings are conducting at the same time), the flyback transformer must store energy during the primary switch on-time, delivering it to the load during the primary switch off-time.

To adjust the taps of no-load voltage regulating transformers such as box-type transformers and factory-based transformers, the transformer must be powered off, the switches on both sides and the isolation knife gate (the trolley switch are pulled out), and the taps can be adjusted after taking safety measures.

If the transformer cannot be immediately switched out, then it must be considered to be at risk of failure and a minimum 20m exclusion zone established preferably by evacuating the compound. On no account must the transformer be approached for oil sampling, or for any other reason, until it is known to be de-energized.

Ideally, a transformer stores no energy–all energy is transferred instantaneously from input to output. In practice, all transformers do store some undesired energy: Leakage inductance represents energy stored in the non-magnetic regions between windings, caused by imperfect flux coupling.

The use of sudden pressure relays (SPRs) has been a subject of great debate ever since their introduction in the 1950’s as a possible component of a transformer protection system. This type of device is also commonly referred to as a fault pressure relay (FPR) and rapid pressure rise relay (RPR).

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6 FAQs about [The box transformer switch does not respond when the energy storage is pressed]

Do Transformers store undesired energy?

In practice, all transformers do store some undesired energy: Leakage inductance represents energy stored in the non-magnetic regions between windings, caused by imperfect flux coupling. In the equivalent electrical circuit, leakage inductance is in series with the windings, and the stored energy is proportional to load current squared.

Why does a transformer have a sudden pressure relay?

Some transformers are subject to sudden pressure relay operation due to mechanical forces on the transformer during system faults when no electrical fault is present inside the transformer tank. This can be due to winding shift and subsequent oil movement, or it might be due the location of the SPR on the tank wall.

What happens when a transformer turns off?

When the switch turns off, the transformer magnetizing current causes the voltage to backswing, usually into a clamp. The reverse voltage causes the magnetizing current to decrease back to zero, from whence it started. The reverse volt-seconds will ex-actly equal the volt-seconds when the switch was ON.

What causes a transformer relay to fail?

The root cause of the failure was that the valve on which the relay was mounted had been closed during maintenance. Heat from the sun caused oil pressure to increase to a damaging level because the oil in the relay could not flow back to the transformer tank.

Why is my transformer relay tripping?

Heat from the sun caused oil pressure to increase to a damaging level because the oil in the relay could not flow back to the transformer tank. At least one working group member’s company has experienced a similar case of relay damage, discovered during maintenance, which would have prevented the relay from tripping.

What causes a power transformer to bubble?

Go back to Contents Table ↑ The energy released from electrical discharges in the oil, causes the oil to decompose into hydrocarbon gases. Normally these gases are absorbed into the oil, but if the activity is severe then these gases can form bubbles. Further Reading – Power transformer testing procedures and schemes Go back to Contents Table ↑