Recent Advancements in Production Testing of AC High-Voltage Outdoor Circuit Breakers (original) (raw)
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2019 Progress in Applied Electrical Engineering (PAEE), 2019
Ratings of circuit breakers are currently as high as 1100 kV of rated voltage and at the same time 63 kArms of short circuit rated current to enable developments of power transmission grids up to Ultra High Voltage levels of 1100 kV and more. These voltage and current ratings correspond to a rated short circuit power of 120 GVA. Testing of such highly rated circuit breakers is not feasible with direct circuits where the short circuit power is to be supplied from power grid directly or by means of large synchronous generators. Synthetic test circuits are widely used to reproduce the switching conditions of circuit breaking by separating high current and high voltage phases of the switching process and thus allowing to significantly increase the testing capabilities of short-circuit laboratories. The aim of this paper is to present simulations of three principle synthetic test circuit topologies and to discuss their applicability for development of synthetic test circuit at a short ci...
Digital testing of high-voltage circuit breakers
IEEE Computer Applications in Power, 2002
circuit hreaker is a switching device that the American National Staiidarcls Institute (ANSI) defines as: "A mechanical switching device, capable of making, carrying, ancl breaking currents under normal circuit conditions and also making, carrying for a Pieter Jj, Schauemaker,i Lou uan der Suis; Rent+ P P Smeets! Vikror Kert&sz2
Test Result Utilization in the Development Process of High Voltage SF6 Circuit-Breaker
Acta Polytechnica Hungarica, 2020
During the development tests of high voltagecircuit-breakers (HVCB), the manufacturers obtain a large amount of information regarding the behavior and parameters of the equipment. Such valuable conclusions can be deduced from processing, analyzing and evaluating them by scientific methods that are appropriate for developing a new decision-supporting model. The Author describes the methodology of the development process of such part of the new decision-supporting model (Circuit Breaker Design algorithm CBDa) which systematizes and evaluates the information from tests as results and illustrates the possible ways of usage.
Study and Application of On-site AC Withstand Voltage Test System to 750kV Circuit Breaker
The standard and time sequence of on-site AC withstand voltage test of 750kV breaker is presented in the paper. Based on series resonant principle, test method and parameters of each equipment in the test system are analyzed. On the basis of that, a whole set of on-site AC withstand voltage test system of 750kV breaker is configured. Actual instance shows that AC withstand voltage test for main circuit and fracture of 750kV breaker can be completed successfully.
The influence of the topology of test circuits on the interrupting performance of circuit breakers
IEEE Transactions on Power Delivery, 1995
Absrracr-High-voltage circuit breakers are tested in the High Power Laboratory where transient recovery voltages (TRVs) are generated by networks consisting of lumped elements. In the IEC and ANSI standards the TRV waveforms are described, but not the topology of the test circuits. This paper compares different direct TRV test circuits which generate the same initial part of the TRV waveform. It is demonstrated that the surge impedance of the TRV test circuit is an important parameter. The difference in interrupting performance of the TB in the test circuits with the different surge impedances is caused by the influence of the arc-circuit interaction.
A Test of Circuit Breakers Under Harmonic Loading Conditions
1995
WV 420 Hz 7th Harmonic currents in Army installation power systems can cause voltage distortion, overheating of system components, and load disruption. The U.S. Army Center for Public Works also has periodically received reports of unexplained nuisance circuit breaker tripping, which in theory might be caused by harmonics. No industrystandard literature is available on the behavior of circuit breakers under harmonic loading conditions, however. The objective of this work was to test the effects of harmonic loading conditions on three common types of low-voltage, molded-case circuit breakers used indoors on Army installations: thermal-magnetic, magnetic-only, and solid state. This experiment detected no nuisance tripping with any of the breakers tested. Additionally it was found that varying harmonic loading conditions did not affect manufacturerspecified trip times for thermal-magnetic or solid state circuit breakers. However, under moderate overload conditions, the same experimental harmonic conditions caused hazardous overheating and trip failure in the magnetic-only circuit breakers. Based on a review of related nonexperimental industry literature on circuit breaker design and performance, the authors postulate that inherent design characteristics leave thermal-magnetic and solid state circuit breakers unaffected by harmonics. The literature also suggests that the construction of the instantaneous tripping element in the magnetic-only breakers may account for their overheating and trip failure in the experiment.
A Three-phase Test Circuit Design for High Voltage Circuit Breaker Based on Modelling .
AL-Bahir Quarterly Adjudicated Journal for Natural and Engineering Research and Studies, 2016
Modern electric power systems performance depend significantly on the operation of circuit breakers. Circuit breaker are used to detect disturbance in the electrical network and to protect the sensitive equipment and costly instruments such as: generators, transformers, and many more. So, they must operate within extremely tight tolerances especially at the electrical network that operate under a short circuit fault conditions. Evaluation of work efficiency for circuit breaker is an important procedure for demonstrating its ability to curb fault currents, especially short circuit currents and for optimizing reliability of network. This paper aims to design a three-phase test circuit used to evaluate the performance of high voltage circuit breaker under short circuit fault by simulation. By this method, the difficulties of practical tests will be overcome, where it doesn't need high electrical power of real sources, unlimited flexibility to adjust the elements value of test circuit, safe from the risks, and economic because it dependent on modelling.
Teaching Short Circuit Breaking Test on High-Voltage Circuit Breakers
This article describes an efficient method of teaching short circuit breaking test of high-voltage circuit breakers, to undergraduate students of power system groups in electrical engineering departments, as a part of a high-voltage course for senior undergraduate students. The article shows how to simulate the components of testing circuit and breaker in order to teach students the test. Evaluation of the simulation over several semesters with more than 40 students is very positive in terms of their developing confidence in and understanding of short circuit breaking test on high-voltage circuit breakers.
Safe and quick High voltage circuit breaker testing using DCM dual ground technology
Safety is one of utmost important factors during testing, commissioning and maintenance of HV equipment. Especially for high voltage circuit breakers, regulation requires that both sides of a circuit breaker to be grounded during testing. Timing test, is one of most important tests for HV circuit breaker, traditionally was not possible using dual ground method since open and close cannot be sensed as it is always shorted by ground loop. This puts testing personnel to danger and requires additional safety steps which also increase testing time. DRM method was developed 15 years ago which made it possible on some outdoor HV breakers. However, DRM had lot of limitations which simply was not possible in some instances like GIS switchgear. As a result, DCM resonance method was developed and patented to solve these issues. This paper, will discusses how DCM method works and what benefits it provides to safety and testing time. This paper also discussed the benefits DCM method provides over older DRM method.