How does shunt reactor work?
A shunt reactor is a piece of electrical equipment used in high voltage power transmission systems to stabilize the voltage during load variations. A traditional shunt reactor has a fixed rating and is either connected to the transmission line all the time or switched in and out depending on the load.
What is the function of the shunt reactor in a substation?
Shunt reactors provide voltage control and reactive power compensation. They are arranged between line voltage and ground. Their place of installation is usually located at the start or end of a long overhead power line or cable connection, or in central substations.
Why does a shunt capacitor work?
The shunt capacitors with high voltage support the voltage of the transmission system, which is frequently required whenever the transmission grid is moved. Since these capacitors generate reactive power, generators no longer require generating as much, allowing them to work at high PFs & generate more real power.
What is the difference between a transformer and shunt reactor?
While a Power Transformer is designed for efficient power transfer from one voltage system to another, a shunt reactor is intended only to consume reactive VArs (or in other words it can be stated as to produce lagging VArs).
What is series and shunt capacitor?
The shunt capacitor does it by changing the power factor of the load, whereas the series capacitor does it by directly offsetting the inductive reactance of the circuit to which it is applied.
What is a shunt capacitor and what is its purpose in a network?
2. Shunt Capacitors. Shunt capacitors, that is, capacitors connected in parallel with lines, are used extensively in distribution systems. Shunt capacitors supply the type of reactive power or current to counteract the out-of-phase component of current required by an inductive load.
How voltage can be controlled using shunt capacitor?
Voltage control by using shunt capacitors The line experiences IXL drop due to this lagging current. Switching in shunt capacitors compensate this inductive reactance, thereby, decreasing the IXL drop. Thus, shunt capacitors can be used to control the line voltage when the load is highly inductive.
What is the purpose of shunt and series reactor?
Shunt reactor limits the over voltage but series reactor limits the high current. Shunt reactor uses as reactive power absorber, series reactor uses as current limiter and increase the impedance of the circuit.
How do you test a shunt reactor?
Type Tests of Shunt Reactor
- Measurement of Winding Resistance.
- Measurement of Insulation Resistance.
- Measurement of Reactance.
- Measurement of Losses.
- Dielectric Withstand Tests.
- Temperature Rise Test.
Why do we use capacitors in series?
Series capacitors are used to compensate the inductance of transmission line. They will increase the transmission capacity and the stability of the line. These are also used to share the load between parallel lines.
Why series reactor is used in capacitor bank?
As a matter of fact, the main function of the series reactor is to restrain the higher harmonic or limit the switching surge, prevent the harmonic wave from endangering the capacitor, avoiding the excessive amplification and resonance generation of the access of the capacitor to the power grid harmonic.
Why capacitor is used in substation?
Purpose of capacitor bank Thus, they are installed in substations to: Correct power factor, consequently minimizes voltage drop at the load end, by injecting reactive volt-amp a.k.a. VARs.
What is purpose of capacitor bank?
In electric power distribution, capacitor banks are used for power-factor correction. These banks are needed to counteract inductive loading from devices like electric motors and transmission lines, thus making the load appear to be mostly resistive.
What is shunt capacitor placement?
Shunt capacitors are placed in a combination of fixed and switched (variable) capacitor banks. The size of fixed capacitor bank depends on average reactive power demand of the system while switched capacitor banks supply difference of current reactive power demand and fixed capacitive power available.
What is a three phase shunt reactor?
A three phase shunt reactor is generally connected to 400KV or above electrical bus system for capacitive reactive power compensation of the power system and to control dynamic over voltage occurring in the system due to load rejection.
What is 3 phase power shunt capacitor?
The 3 phase power shunt capacitor is installed at low voltage electrical system in parallel for improving power factor and self-healing performance of electrical power. 50 kvar rating capacity, can be used in 50Hz or 60Hz, 450V AC circuit system.
What is the maximum rated voltage of a shunt reactor?
VSR are mainly used in extra high and high voltage networks (rated voltage of the network ≥ 60 kV). Maximum rated voltage of shunt reactors is nowadays 800 kV and rated power goes up to 300 MVAr. Same like power transformers, shunt reactors may be designed like Oil-immersed and Dry type transformer as well.
How to measure the loss of a shunt reactor?
This difficulty can be overcome, by measuring the losses of the shunt reactor at any voltage lower than the system voltage of the reactor. Then this measured loss is multiplied by the square of the ratio of rated current to the current of the reactor at applied reduced test voltage to obtain the loss at rated voltage.