1 / 7

CIGRE SC B5 Colloquium in Calgary 2005: SR for PS#3 Question 14

CIGRE SC B5 Colloquium in Calgary 2005: SR for PS#3 Question 14. Joint Meeting and Colloquium of the CIGRE’ Study Committee B5 - Protection & Automation and IEEE Power System Relaying Committee Question #14:

adila
Télécharger la présentation

CIGRE SC B5 Colloquium in Calgary 2005: SR for PS#3 Question 14

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. CIGRE SC B5 Colloquium in Calgary 2005: SR for PS#3 Question 14 Joint Meeting and Colloquium of theCIGRE’ Study Committee B5 - Protection & Automation andIEEE Power System Relaying Committee Question #14: What influences of shunt capacitor banks on protection measurement are reported and how are the effects mitigated ?

  2. ACRE-RONDONIA Power System 188 km 302 km Strong Infeed Weak Infeed Shunt Capacitor Banks

  3. L2 Thevènin Reduction of the ELN Acre-Rondonia System for Computer-Aided Analysis & Simulations Shunt Capacitor Bank Rio Branco S/S Abuna S/S Porto Velho S/S 20 MVAr 07 03 C2 A1 A2 C1 E2 E1 08 04 06   L1 ZS1 , ZS10 ZS2 ,ZS20 Strong Infeed 02 Weak Infeed 188 km 302 km 160 MVAr 01 05 09 130 MVAr Shunt Capacitor Banks

  4. The problems • Shunt capacitors have a considerable impact on the circulating currents and transient behaviour of the protection relay during line faults under weak infeed conditions. • Some faults can challenge the basic principles and, unless measures are taken, incorrect operation of the protection devices can result. • Some examples of such conditions are close-up faults where the faulted voltage is virtually zero, so that the correct direction is more difficult to determine. • Reverse faults in Porto Velho S/S may be seen as a forward fault when one side of the transmission system is weak. • Moreover, the apparent fault resistance depends on the fault location and is very pronounced in Abuna S/S (Semaphore effect). This has a similar effect as an additional strong infeed, and thereby increases enormously the measured fault resistance when the fault location approaches the opposite line-end near Porto Velho S/S.

  5. F1 F3 F2 I1 I2 E2  E1 ZL1 , ZL0 ZS2 ,ZS20  ZS1 , ZS10 Directional Characteristics of Distance Protection F3 Fault trajectory is crossing the tripping area F2 F1

  6. I1 I2 F2 E2  E1 ZL1 , ZL0 ZS2 ,ZS20  ZS1 , ZS10 X RRE/2 RR/2 0 -RR -R X/8 -RRE R F2 ZS F2 a = 3° 7° / 14° -X HEST 045 014V For Ph-Ph & 3Ph Loop Adapted Directional Characteristics for Acre-Rondonia Power System Fault trajectory is crossing the tripping area Enough room available for the fault trajectory excursion in the backward direction

  7. Conclusions • In geographically large countries, the power must often be transferred from remote power generation centres to the load centres. In the case presented, the transmission system angle can therefore exceed 60°. • For the majority of faults, distance protection operates correctly in the Acre-Rondonia system. • To achieve the best results under all system conditions, more than one polarisation quantity for the directional decision must be used:- directional decision built-in each of the 6 measured loops- directional decision based on more than one polarising quantity (adaptive measurement characteristics with automatic selection) - directional decision using cross-polarising healthy phases in conjunction with memory polarisation, selectivity conditions and filtering techniques.

More Related