The optimization of 500 kV breaker failure protection

Jiang, Yu; Hong-yang, Zhou; Chen, Zhaohui; Li, Jie; Li, Yiquan; Shaofan, Zhang

doi:10.1109/ciced.2014.6992256

Cited by 1 publication

(6 citation statements)

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“…All the variations in relay operate times were statistically modeled and sorted into three generations of protection devices. The circuit breaker's complex physics is statistically modeled based on ranges of opening and arcing times obtained from the type tests of a widely used CB model and additionally, using statistics from CB operations in China Southern Grid [6]. Finally, >1 million fault cases were simulated and average fault clearing times were calculated for each one of the three generations of protective relays.…”

Section: Fault Clearing Time Evaluation Methodologymentioning

confidence: 99%

“…The BFP will send a trip signal after a predefined time delay if the fault current is still present (despite the initial relay operating signal). Typical time delay of BFP is between 7.2 cycles and 15 cycles (144 ms -300 ms in 50 Hz systems [6]). As an example, in recent years in China Southern Grid (CSG) several cases of breaker failures occurred and CCT of some 500kV stations was around 350 ms [6].…”

Section: A Power System Stability Requirementmentioning

confidence: 99%

“…Typical time delay of BFP is between 7.2 cycles and 15 cycles (144 ms -300 ms in 50 Hz systems [6]). As an example, in recent years in China Southern Grid (CSG) several cases of breaker failures occurred and CCT of some 500kV stations was around 350 ms [6]. Despite all these aspects, in most of the scientific publications, a simplified interpretation of protection systems is present, whereby only the relay operate time is considered as the important part of the overall protection system.…”

Section: A Power System Stability Requirementmentioning

confidence: 99%

“…In this scenario single-phase to ground faults are only considered, while FCT for other types of faults will be even longer than the one presented in this paper. Similarly, data from the second scenario, a study conducted in China, were used for additional evaluation [6].…”

Section: Impact Of Circuit Breakers On Fault Clearing Timementioning

confidence: 99%

“…8b. where percentages in 10 ms time intervals are provided in [6]. The difference in the range of the CB interrupting times in Fig.…”

Section: Impact Of Circuit Breakers On Fault Clearing Timementioning

confidence: 99%

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Line Protection Operate Time: How Fast Shall It Be?

2021

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An ultra-high-speed protective relay has been an important topic within the scientific community, and specifically within the power industry, for decades. The main drivers are the anticipated improvements in power system stability and power transfer capability which have become even more important with the increased penetration of renewable generation sources. The relay operate time is a relatively small part of the required improvement, since the circuit breaker interrupting time contributes the major part of the total fault clearing time. The first promising results in reducing the fault clearing time, from two or three cycles, down to one power system cycle, date back to 1976 when the relay operate time of 1.5 ms was achieved. Availability of sub-cycle breakers was anticipated in the early 1980-s. Nevertheless, almost forty years later, commercially viable ¾ cycle breakers are still not available and their impact on the total fault clearing time has been omitted from most of the literature. The numerical relays operate time improvement has become the only goal and results are wrongly equalized with improvements in the total fault clearing time and directly correlated with improvements in power system stability. In this paper the real benefits of ultra-high-speed relay operate time are analyzed, considering the characteristics of the state-of-the-art circuit breakers and their interrupting time of 1.5-2 power system cycles (older circuit breakers are slower). A more holistic view, including interactions between protective relays and circuit breakers, as well as final benefits to utilities, is given in the paper.

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Section: Fault Clearing Time Evaluation Methodologymentioning

confidence: 99%

Section: A Power System Stability Requirementmentioning

confidence: 99%