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Agarwal, Yugal
- Interpretation of NSDD and Restrike in Capacitive Current Switching Test on Medium Voltage Vacuum Circuit Breaker
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Authors
Affiliations
1 Switchgear Testing and Development Station, Central Power Research Institute Govindpura, Bhopal – 462023, Madhya Pradesh, IN
1 Switchgear Testing and Development Station, Central Power Research Institute Govindpura, Bhopal – 462023, Madhya Pradesh, IN
Source
Power Research, Vol 17, No 2 (2021), Pagination: 81-87Abstract
Capacitor banks are installed in an increasing number to control power quality issues and improving the power factor to counteract the reactive power in the transmission and distribution networks. Due to load fluctuations switching of capacitor banks is a typical phenomenon. Capacitor bank is normally having concentrated capacitance in contrast with distributed capacitance. It generally draws more current than unloaded cableor line in practical cases up to several hundred amperes. Hence, switching of capacitor bank causes a very high rate of rise of transient recovery voltage across circuit breaker contacts. This scenario can be simulated in testing laboratories by a voltage source connected to a circuit breaker which again is connected to a large capacitance in terms of IEC called capacitive current switching test. Non-sustained disruptive discharge (NSDD) is a voltage breakdown after the vacuum circuit-breaker open the fault current which will not cause the recovery of power frequency current. Restrike is different from NSDD, the recovery of power frequency current between the contacts will make the breaker failed. It’s not easy to show the distinction between NSDD and restrike during some type tests. The paper presents the study of performance evaluation of the circuit breaker during the capacitor current switching duties. A statistical analysis of failure of circuit breaker during capacitor current switching tests are included in the paper to help the manufacturers & utilities, so that the care can be taken for trouble free services. The paper also discusses the changes made in the IEC 62271 – 100, Amendment1:2012 for conducting the capacitive current switching tests.Keywords
Capacitor Switching Duty Cycle, Non-sustained Disruptive Discharge (NSDD), Voltage Breakdown, Capacitive Current Switching Test,Current Switching Test, Inadequate Synchronization.
References
- Thielens DW. Circuit Influences on Non-Sustained Disruptive Discharges in Vacuum Switching Devices. Eindhoven University, M.Sc. report S433649; 2003.
- Smeets RPP, Wiggers R, Bannink H, Kuivenhoven S, Chakraborty S, Sandolache G. The impact of switching capacitor banks with very high inrush current on switchgear. CIGRE Conference, paper A3; 2012.
- IEC 62271-100; 2008.
- IEEE C37.012.
- Smeets RPP, Lathouwers AGA, Falkingham LT. Assessment of Non-Sustained Disruptive Discharges (NSDD) in Switchgear. Test experience and standardisation status. CIGRE Conference, paper A3-303; 2004.
- Performance Evaluation of Circuit Breakers under Asymmetrical Fault Condition (Test Duty T100a)
Abstract Views :72 |
PDF Views:0
Authors
Affiliations
1 Central Power Research Institute, Govindpura, Bhopal – 462023, Madhya Pradesh, IN
1 Central Power Research Institute, Govindpura, Bhopal – 462023, Madhya Pradesh, IN
Source
Power Research, Vol 17, No 2 (2021), Pagination: 113-119Abstract
Among several switchgear equipment largely used in high voltage Transmission systems, which change the grid configuration, isolates faulty parts from the grid, etc. circuit breaker is a remarkable one. For the reason to analyse the interrupting capabilities, a circuit breaker has to undergo various test duties according to IEC 62271-100 among which Test duty T100a is considered as the most onerous one. During this test the breaker has to prove its Interrupting capability during maximum arc energy condition. This article focuses on the Performance evaluation of circuit breaker under asymmetric condition Test duty T100a.Keywords
Asymmetrical Fault, Circuit Breaker, IEC 62271-100, Luminous Electric Discharge, Test Duty T100a.References
- High Voltage switchgear and control gear for Alternating circuit breakers, IEC 62271-100, 2017 Edition 2.0.
- Cigre Guide for Application part-2 of IEC 62271-100 & IEC 62271-1 for making and breaking tests.
- Guide to the interpretation of IEC 62271–100: Edition 2.0 2008-04 High-voltage switchgear and control gear part 100: High-voltage alternating-current circuit-breakers, Issue 9.0, 01-05-2011.