What is the condition of zero voltage regulation?
What is the condition of zero voltage regulation?
Zero Voltage Regulation of A Transformer ‘Zero voltage regulation’ indicates that there is no difference between its ‘no-load voltage’ and its ‘full-load voltage’. This means that in the voltage regulation equation above, voltage regulation is equal to zero.
At what power factor the voltage regulation of transformer is zero?
Zero voltage regulation of a transformer is achieved at 1 pf leading.
In which of the following case will the voltage regulation of a line be zero?
Explanation: Since voltage regulation of a transformer in the leading loading condition is not additive in nature, at particular power factor in leading we can get zero voltage regulation.
What is the condition for maximum regulation occurs?
The regulation is maximum when the load power factor angle is equal to the impedance angle of the transformer. i.e., Equation (1.58) shows the power factor of the load at which voltage regulation is maximum.
What is poor voltage regulation?
Poor power line voltage regulation causes lights in a home to dim each time the refrigerator starts. Similarly, if a change in the current from a power supply causes the voltage to vary, the power supply has poor voltage regulation. An uncertain supply voltage can result in poor circuit performance.
What does negative voltage regulation indicate?
Negative voltage regulation means the voltage increases with the load. This is a very undesirable condition because it can lead to an unstable condition. Many loads use more power as the voltage increases. Thus, the voltage goes up, causing the power to go up, potentially causing the voltage to go up some more.
Which is not loss in transformer?
What are No-Load Losses (Excitation Losses)? It is the loss in a transformer that is excited at rated voltage and frequency, but without a load connected to the secondary. No-load losses include core loss, dielectric loss, and copper loss in the winding due to exciting current.
How do you find voltage regulation?
Voltage Regulation for 11KV, 22KV, 33KV Overhead Line
- % Voltage Regulation = (1.06 x P x L x PF) / (LDF x RC x DF)
- RC = (KV x KV x 10) / ( RCosΦ + XSinΦ)
- Required size of Capacitor (Kvar) = KVA1 (Sin ø1 – [Cos ø1 / Cos ø2] x Sin ø2)
- L = [1 – (KVARC / 2 KVARL) x (2n – 1)]
- % Voltage Rise = (KVAR(Cap) x Lx X) / 10 x Vx2.
What is the maximum voltage regulation?
For Maximum Voltage Regulation, d(VR) / dƟ2 = 0 assuming load current constant. Thus we can say that, maximum Voltage Regulation occurs when load power factor is equal to leakage impedance angle.
What are the factors affecting voltage regulation?
The voltage regulation of the transformer is the percentage change in the output voltage from no-load to full-load. And since power factor is a determining factor in the secondary voltage, power factor influences voltage regulation. This means the voltage regulation of a transformer is a dynamic, load-dependent number.
Which voltage regulation is best?
The ideal voltage regulation should be zero.
How can voltage regulation be reduced?
Using shunt capacitors, using shunt capacitors at receiving end or at selected points across your TL will compensate part of the inductive reactance, and hence will decrease the current that flows in the TL and this will decrease the voltage drop and hence increases the voltage.
Is it possible to have zero voltage regulation?
Zero Voltage Regulation – Is it possible? Yes, zero regulation is possible for a slightly leading power factor situation. For large leading power factor, the regulation will be negative. The following calculator can be used to calculate the voltage regulation considering the load power factor.
Which is the worst case for voltage regulation?
It is normal to calculate regulation at 50% load, 80% load etc. However, the worst case is usually the full load. Note that only the voltage magnitudes are considered. The phase angle of the voltage is not a factor in the regulation equation.
Which is the best definition of voltage regulation?
To engineers, ‘regulation’ means variation of output speed or voltage as the load on that device is increased from zero to rated full load of the device. For transformers, voltage regulation can be defined as the ratio of the difference in the secondary voltage from no load to the full load to the full load voltage.
What are the initial conditions for zero voltage switching?
Initial Conditions: Time interval < to Before analyzing the individual time inter- vals, the initial conditions of the circuit must be deflDed. The analysis will begin with switch Ql on, conducting a drain current ID equal to the output current Io, and VDs = VCR = O (ideal).