Severity Indices for Assessment of Equipment Sensitivity to Voltage Sags and Short Interruptions

Chan, Jhan Yhee; Milanović, Jovica V.

doi:10.1109/pes.2007.385457

Cited by 43 publications

(31 citation statements)

References 9 publications

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“…As in [22], a severity index, denoted by s(V, T), is introduced to assess the impact of voltage sags and short interruptions on sensitive equipment. By substituting of (9), (10) and (11) into the optimization model (5), the most possible value of equipment status probability pr, pm and pf can be further derived.…”

Section: Arithmetic Of Equipment Sensitivity Assessmentmentioning

confidence: 99%

Maximum Hybrid Entropy Interval Probability Assessment of Equipment Failure Due to Voltage Sags

Zeng

et al. 2011

2011 Asia-Pacific Power and Energy Engineering Conference

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There is complex uncertainty involved in evaluation of equipment sensitivity to voltage sags, and that makes it difficult for the point-valued assessment method to evaluate the impact of voltage sags on the sensitive equipment, especially in the case of small sample size. Considering the multi-valued nature of equipment status during the voltage sags, the voltage tolerance level of sensitive equipment is characterized by interval data, so as to derive interval probabilities of equipment operation status. Meanwhile, hybrid entropy is then used to measure the uncertainty of randomness and fuzziness in equipment voltage tolerance level. It develops one novel model by transforming the interval probability into point-valued probability based on maximum hybrid entropy model. By the help of personal computers, the proposed model is finally verified in a test distribution system.

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Section: Arithmetic Of Equipment Sensitivity Assessmentmentioning

confidence: 99%

Maximum Hybrid Entropy Interval Probability Assessment of Equipment Failure Due to Voltage Sags

Zeng

et al. 2011

2011 Asia-Pacific Power and Energy Engineering Conference

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“…Therefore, failure risk analysis of individual process chain is needed to identify the weakest link. Reference [9] describes a procedure to identify the most vulnerable device in a process by analyzing various sensitivity indices and respective process immunity to voltage dips.…”

Section: A Customer's Process Sensitivity To Various Voltage Dipsmentioning

confidence: 99%

Assessment of the impacts of voltage dips for a MV customer

Bhattacharyya¹,

Cobben²,

Kling

2010

Proceedings of 14th International Conference on Harmonics and Quality of Power - ICHQP 2010

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“…Voltage sag severity is defined based on residual voltage and duration of a voltage sag by comparing their values with a reference curve [15][16][17]. More recently in [18], two indices Magnitude Severity Index (MSI) and Duration Severity Index (DSI) were proposed to represent the magnitude and duration severity respectively, and served as input parameters for different assessment approaches. Magnitude-Duration Severity Index (MDSI) uses single numerical value, by combing MSI and DSI, to represent the failure risk of equipment when subjected to voltage sags.…”

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confidence: 99%

Identification of Weak Areas of Power Network Based on Exposure to Voltage Sags—Part I: Development of Sag Severity Index for Single-Event Characterization

Liao

Abdel-Rahman

Guo

et al. 2015

IEEE Trans. Power Delivery

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Abstract--This paper presents new single-event characteristic, sag severity index (SSI) derived with respect to equipment sensitivity to voltage sags. It is more inclusive of associated uncertainties/variation in equipment response to voltage sags than existing sag severity indices. By changing parameter settings the index appropriately accounts for sag duration and adequately addresses the variation in equipment sensitivity. The value of the index changes continuously at the joining regions of different sag severity levels and reflects realistically the sensitivity trend of equipment embedded in voltage tolerance curves. The properties of the SSI are analysed and discussed through comparison with characteristics of five previously reported single-event indices including four numerical indices and one fuzzy voltage sag index.Index Terms-Voltage sags, equipment susceptibility, voltage tolerance curves, sag severity index. I. INTRODUCTIONoltage sags result in substantial financial losses to many utilities and industries, due to the frequent disruptions to industrial processes and malfunction of electronic equipment [1]. This issue is one of the most critical power quality problems, and sag severity assessment has been a focal point for many researchers in the area of Power Quality in the past. As a critical step of mitigation planning, it is necessary to assess the severity of voltage sags accurately.The severity of voltage sags is strongly related to the response of equipment to voltage sags. Therefore, in order to accurately evaluate the impact of voltage sags, the sensitivity of equipment and ultimately industrial processes to voltage sags must be known. The sensitivity curves of specific equipment have been intensively investigated [2][3][4], and a number of international standards have been set up to provide guidelines for system/tool design in terms of ride-through capability to voltage sags, such as the voltage tolerance curves recommended in IEEE 1346 [5]. From the customers' and equipment manufacturers' perspective, step-shaped ITIC curve [6], a successor of CBEMA curve, was proposed and recommended for use after extensive research in computer power supplies. More recently proposed SEMI F47 curve/standard with similar step-shaped curve was proposed to specify the design requirements of minimum voltage sag ridethrough capability for equipment used in semiconductor industry [7]. This standard provides a target for the facility and utility systems, and it has been used to strictly guide the design of semiconductor processing, metrology, and automated test equipment. In IEEE Standard 1564, ITIC and SEMI F47 are recommended as reference curves to calculate voltage sag severity [8]. In the absence of accurate, specific equipment and process sensitivity curves to voltage sags, standards ITIC and SEMI can be, and generally are used to approximate the response of equipment and industrial processes to voltage sags from the perspective of utility side, equipment manufactures and customers in distribution networks [8...

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Severity Indices for Assessment of Equipment Sensitivity to Voltage Sags and Short Interruptions

Cited by 43 publications

References 9 publications

Maximum Hybrid Entropy Interval Probability Assessment of Equipment Failure Due to Voltage Sags

Maximum Hybrid Entropy Interval Probability Assessment of Equipment Failure Due to Voltage Sags

Assessment of the impacts of voltage dips for a MV customer

Identification of Weak Areas of Power Network Based on Exposure to Voltage Sags—Part I: Development of Sag Severity Index for Single-Event Characterization

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