Distance Relay Protection based in "Travelling Waves" not Impedance.

[JuanGomez]

Hi everyone.

I am investigating to use a system based in Protection for transmission line or or other aplication (Ex. ANSI 21: Distance Protection) based in "Travelling Waves" instead of the usual calculation impedance.

1.- They know some relay, model, manufacturer of such equipment?
2.- What may be the advantages or disadvantages of this method?
3.- They know that cases are recommended to use such technology and which is not recommended, that the decision depends on factors?
4.- someone has some typical diagram of implementation?

thanks in advance for the information.
Juan Gómez

 

[gunax]

It's make sense, but I never heard this before except for fault locator/estimator.

Rgds
Guna

 

[JuanGomez]

There are studies about this method of calculation for protection relays (Faults).

You can find basic information about the operation at the following links:

- CIRED EVALUATION OF TRAVELLING WAVE BASED PROTECTION SCHEMES

http://www.eeh.ee.ethz.ch/downloads/psl/publications/geidl_cired_05.pdf

- Relay Protection of EHV Shunt Reactors Based on. the Traveling Wave

http://www.ipst.org/TechPapers/2005/IPST05_Paper254.pdf

- HIGH SPEED DIGITAL PROTECTION. OF EHV TRANSMISSION LINES. USING TRAVELING WAVES.

http://library2.usask.ca/theses/available/etd-04302004-143430/unrestricted/Thesis_hss408.pdf

- Protección de sistemas eléctricos mediante reconocimiento de patrones de onda viajera

http://ingenierias.uanl.mx/30/30_proteccion de sistemas.pdf

I know little of the subject but I understand that it is much faster in detecting that the traditional method due to use higher frequencies injected into the network and detect the bug in cycles faster by getting a wave of increased frequency of 50/60Hz.

In some cases one negative aspect is that for distances close to the relay point (starting point of the traveling wave), is not as accurate a few miles <7-10km, for distances> 7-10K is a good way (maybe this aspect was fixed in the new schemes).

Thanks.