high voltage testing.ppt

Digital Testing of HVcircuit BreakerPresented by –Ragni kumari Roll no – 10/FET/EE(S)/2010

Introduction Need for testing Testing of circuit breaker Digital testing Advantage & Disadvantage Application C conclusion

Outlines

What is circuit breaker Circuit breaker is a mechanical switching device which

capable of making, carrying and breaking current under normal & abnormal condition

Circuit breaker can make and break manually or Automatically

It break no load, full load and short circuit condition It also break a specified time

Introduction

Diagram

In close position they are good conductor

In open position they are excellent insulator

They can close a shorted circuit quickly and safely without unacceptable

contact erosion

They can interrupt a rated short-circuit current or lower current quickly

without generating an abnormal voltage

Essential qualities of HV circuit breaker

Circuit breaker

Need for testing HV circuit breaker

Circuit breaker is a mechanical device

which are subject to deterioration due to wear, corrosion and environmental contamination.

When an overload or a short circuit occurs in the home or industry, the usual result is a blown fuse or a tripped circuit breaker.

Setup of circuit breaker

Testing of high voltage circuit breaker

1. Routine tests

2. Types test

Digital testing

This project started with the following parties :

•KEMA high power laboratories The Netherlands. •Delft University of technology, The Netherlands. •Siemens AG, Germany •RWE Energy ,Germany

Aim of Digital testing

Digital offers a wide range of new possibilities for users, manufactures, standardizing bodies and test laboratories for fine tuning circuit breaker abilities in relation with standard and real power systems

It is a software.

Measurement & data analysis

This system consists a number of battery powered, single channel 40MHz 12bit AD converters each storing data temporarily in on board local RAM (256k each samples )

After the remote RAM is filled, data is transmitted serially through optical fibres to the processing unit in the command centre

Circuit Diagram

Working process of digital testing of HV circuit breaker

The arc voltage is measured with standard broad band RCR type voltage dividers. Current is measured with a special Rogowski coil. After the remote RAM is filled, data is

Advantage Evaluation of the relevance of future standards for different circuit breaker technologies and extinguishing media Estimation of circuit breaker’s interrupting limit Reduction of full scale testing in high-power laboratoriesExpansion of services for high-power laboratories It provides ease testing

Disadvantage This circuit breaker testing is costlier compare than other circuit breakerThis circuit breaker is time consumingIt is a touch processThis circuit breaker result is more accurate

ApplicationIt play important role in laboratories test

It play very important role in transmission and distribution system

finger prints are obtained from real tests can be estimated in other circuits also

Conclusion

Digital testing gives precise information about the breaker, as obtained from laboratory tests. This is useful for the development of future standards. Powerful possibilities with digital testing are created when arc model and data analysis is coupled with a circuit analysis package. The performance of a circuit breaker whose finger prints are obtained from real tests can be estimated in other circuits also

Thank you