Saturated Reactor(SR) & Thyristor Controlled Reactor(TCR)

This ppt explained the basic concepts , VI characteristics , Advantages and disadvantages of Saturated Reactor & Thyristor Controlled Reactor.

1. SATURATED REACTOR AND THYRISTOR CONTROLLED REACTOR Submitted By, M. Pratheep , ICE – 4 th Year , SCE, Trichy.

2. SATURATED REACTOR ( SR ) : Saturated reactor is used for controlling reactive power. It consist of reactor and shunt capacitor bank. It is like a magnetic switch which control current during each half cycle. It is also called as tapped reactor and it is single phase. It have multiple taps for varying the inductance according to the requirements of loads .

3. SR - Circuit Diagram :

4. Saturated Reactor (SR) : When it get saturated further increase in current will not cause increase in magnetic flux and when it became saturated, the reactor (inductor) losses its inductance property and hence decrease in inductive reactance will allow increase in Ac current flow. Controlling element of saturated reactor is Saturable magnetic core. This can be controlled directly or remotely. Controlling winding consists of DC and it is separated from AC power. Saturated Reactor is a magnetic amplifier.

5. Saturated Reactor ( sr ) : The relation between DC control volt amp and AC control volt amp is called Amplification factor. V-I characteristic :

6. Advantage And Disadvantage : The advantage of saturated reactor is it low maintenance and performance at high temperature. The disadvantage of saturated reactor is its slow response.

7. THYRISTOR CONTROLLED REACTOR (TCR) The controlled element is the reactor and the controlling element is the thyristor controller consisting of two opposite poled thyristors which conduct every half cycle of the supply frequency. Currently available thyristors can block voltage upto 4000-9000 V and conduct current upto 3000-6000 A. Practically 10-20 thyristors are connected in series to meet the required blocking voltage .

8. TCR - Circuit Diagram :

9. V–I Characteristics Of TCR :

10. Thyristor Controlled Reactor : A thyristor controlled reactor is usually a three-phase assembly, normally connected in a delta arrangement to provide partial cancellation of  Harmonics . Often the main TCR reactor is split into two halves, with the thyristor valve connected between the two halves. This protects the vulnerable thyristor valve from damage due to flashovers, lightning strikes etc.

11. Thyristor Controlled Reactor : The thyristor valve is phase controlled which give reactive power according to system requirements TCR can be used for limiting voltage rise on lightly loaded transmission line. The current in TCR is continuously vary from zero to maximum by phase control.

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