What happens when transformer is saturated?

When a transformer has reached saturation, the slope of the rising Ids curve changes, and the Ids rises rapidly. This increase in current could destroy a MOSFET or other device.

What happens when CT saturate?

For example, CT1 and CT2 have different magnetizing characteristics, during external fault, high fault current of the same magnitude will flow through both CTs. CT1 saturates while CT2 does not. There will not be secondary current flow in CT1 because the primary current is used as excitation current.

What do you know about the no load current of a transformer?

Explanation: The no load current is about 2-5\% of the full load current and it accounts for the losses in a transformer. These no-load losses include core(iron/fixed) losses, which contains eddy current losses & hysteresis losses and the copper(I2*R) losses due to the no Load current.

Why transformer has current at no load?

In the case of no-load, the secondary terminal of the transformer is open. There is no path available for the current to flow on the secondary side. Hence, the transformer does not draw current from the source.

How does a transformer get saturated?

When a transformer’s primary winding is overloaded from excessive applied voltage, the core flux may reach saturation levels during peak moments of the AC sine wave cycle. If this happens, the voltage induced in the secondary winding will no longer match the wave-shape as the voltage powering the primary coil.

How does a transformer limit current?

The maximum short circuit current that can be obtained from the output of the transformer is limited by the impedance of the transformer and is determined by the multiplying the reciprocal of the impedance timed the full load current.

What causes current transformer saturation?

The dc offset—not the magnitude of the fault current itself—is what causes the saturation. The amount of flux that accumulates in the core of a CT is directly proportional to the area under the voltage (or current) curve. A given CT can handle some maximum amount of flux before it saturates.

What are the function of no load current?

The primary purpose of the no load current is setting up of the magnetic flux. The flux produced in the primary winding travels through the magnetic core and gets linked to the secomdary winding of the transformer. The no load current of a transformer show the current required to magnetise the core.

What does no load current mean?

No load current is that current which is flowing when load is disconnected or not present at a time. Lets consider an example of Transformer, when no load is attached on the secondary side of a transformer, then no current flows due to open circuit of secondary side.

What is no load and full load current?

Thanks for the A2A. Full load current is that which is drawn while the load is operating at full capacity. And no-load current that which is drawn then the load is removed and only the control circuits are drawing current.

What happens to the secondary current when current transformer gets saturated?

When current transformer gets saturated they no longer supply secondary current proportional to supplied primary current. Depending on the level of saturation the measured current on the secondary is much smaller than the value present in the primary. The non-proportional secondary current…

What happens if core flux is too high in transformer?

Saturated (overexcited) transformer is susceptible to thermal damage from excitation current. Excessive core flux can increase inter-lamination voltages causing iron damage (burning, pitting). Figure 2 shows results of a lab experiment with a small control power transformer with no load secondary.

What is the area of saturation curve in transformer?

Please refer the saturation curve between the flux density vs Voltage.. This area of magnetizing curve is called area of saturation. Area of saturation is very dangerous area for work of transformer, because in this area ferromagnetic core temperature increases and it may damage the core.

What will happen if CT current is saturated?

CT are mainly used for Measurement/Metering & Protection Purpose. If the CT gets saturated then secondary current will not be an exact replica of primary current. A saturated CT will lead to following: Incorrect reading in Metering/Measurement equipment.