AIM:- “MOTION DETECTOR FOR SECURITY”

UNDER THE GUIDANCE OFPROF:- SUSHMA.D

PRESENTED BY• GURU M USN: 2SD12EE401• KIRAN HUDDAR USN: 2SD12EE403• SANJUKUMAR BIRADAR USN: 2SD12EE408• SURYAKANTH USN: 2SD12EE410

CONTENTS:-

Objectives Introduction Components required Circuit diagram Construction details Operations Advantages Applications Result Conclusion

REINSERTION SCHEMES

• The shorter the delay the higher the

transient stability limit.

• This reinsertion time delay is dependent

on control relaying speed, bypass switch

opening time and the protective gap

voltage recovery characteristics.

CONTINUE……

Slow speed reinsertion :-

• This system typically uses a nonself-clearing gap, and starts to close the bypass switch when spakover occurs.

• Reinsertion times on slow systems are usually one second or more.

High speed reinsertion :-

• This is the one that reinserts the capacitors within a few cycles following fault clearing.

CONTINUE……

• This can be achieved with high speed switches and controls and gaps that rapidly recover dielectric strength.

Instantaneous reinsertion :-

• This has been achieved by initiating air flow to the gap when sparkover occurs,

to quickly build up insulation strength.

VARISTOR PROTECTIVE GEAR

CONTINUE……

• A new development in series capacitor protective equipment utilizes zinc-oxide varistors.

• This zinc-oxide varistors are the non linear resistor, to limit the voltage across the capacitor.

• The varistor is connected directly in parallel with the capacitor.

• The stability of zinc oxide allows the varistor to withstand continuous energization below knee voltage without significant deterioration.

CONTINUE……

• Triggered air gap is not used in this to limit the capacitor voltage, the voristor only performs that function .

• A bypass switch also necessary in the protective system to allow manual control of insertion , as well as to bypass the capacitor for abnormal system or equipment conditions.

• The discharge reactor is still needed to limit the magnitude and frequency of the capacitor current when either the gaps spark over or the bypass switch closes.

SIMULATION OF ITS OPERATION ON 500KV,60HZ IDEALIZED SYSTEM.