IEEE Recommended Practice for Protection and Co-ordination of Industrial and Commercial Power Systems

Sanderson, J.V.H.

doi:10.1049/pe:19890012

Cited by 4 publications

(2 citation statements)

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“…Standard used for short circuit analysis Industry standards have defined specific analytical techniques that adhere to appropriate guidelines to answer questions about AC and DC derating in multimachine systems [7]. This is also closely related to adjusting the existing switchgear rating structure.…”

Section: Power Flow Solution Methodsmentioning

confidence: 99%

Design of Electrical Setting Protection System Indarung VI Cement Plant (Case Study New Cement Plant Construction at PT Semen Padang)

Prasetyawan

2021

j. amp. : j. ilm. bid. tek. elect. and comp.

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Along with the rapid development of technology and the development of civilization, electrical energy is very important in all fields. This research will conduct a study on the electrical protection system design of PT Semen Padang's Indarung VI Cement Plant using the ETAP 12.6 software. PT Semen Padang's Indarung VI Cement Plant uses three transformers of 150 / 6.3 kV of 30/35 MVA (ONAN / ONAF) and each Main Substation has substations that will supply all the loads to be used. The power flow study shows that the addition of a capacitor bank and a tap changer setting will improve the power factor and voltage of the system, thereby reducing the power supply sent by PLN. The short circuit study shows that the largest short circuit current, which is 35 kA, can be protected by a circuit breaker with a breaking capacity of 40 kA. The protection system coordination study shows that the results of the overcurrent relay setting can protect the electrical system of Indarung VI Cement Plant selectively and safely.

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Section: Power Flow Solution Methodsmentioning

confidence: 99%

Design of Electrical Setting Protection System Indarung VI Cement Plant (Case Study New Cement Plant Construction at PT Semen Padang)

Prasetyawan

2021

j. amp. : j. ilm. bid. tek. elect. and comp.

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“…In general, different features about I M-3ϕ-SC have been mentioned or shown in diverse documents, for example,: (a) the decay of I M-3ϕ-SC is faster in smaller motors [8]; (b) the decay of I AC can be faster than the decay of I DC , and I M-3ϕ-SC can tend to be similar to a decaying DC current when I AC disappears [4,9,10]; (c) I M-3ϕ-SC is not necessarily in phase with the contribution from the grid [11]; (d) the leakage reactance related to I M-3ϕ-SC is considerably lower than the value during normal load conditions [12,13]; (e) the total reactance related to I M-3ϕ-SC is similar to the value during start conditions [7,14]; (f) there is a change of electrical torque in the motor axis due to I M-3ϕ-SC [10,15]; (g) I M-3ϕ-SC is dependent on the number of pole pairs [4,7,16]. Even though the traditional procedures to compute I M-3ϕ-SC are based on phasors [1,7,14,[17][18][19], it is necessary to emphasise that the waveforms of these currents are not sinusoidal. An objective of this article is to complement this disperse information about I M-3ϕ-SC with the results of a detailed analysis of experimental oscillograms and transient simulations.…”

Section: Introductionmentioning

confidence: 97%

Improved equation to describe the induction motor currents during nearby three‐phase short‐circuits

Sorrentino

Vera²

2022

IET Electric Power Appl

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This article shows an improved equation to describe the induction motor currents during a three‐phase short‐circuit near to motor terminals. The proposed equation considers three details which are not in the equation shown in the IEEE Std. 551: (a) the equivalent frequency of these currents is not strictly equal to the grid frequency; (b) the magnitude of the DC component is not strictly equal to the magnitude of the AC component; (c) an angle is included to consider the instant of fault occurrence. The proposed equation was verified by experimental results, which were also verified by simulations. It is shown that the equivalent frequency of analysed currents is not exactly the grid frequency due to the sudden change of the machine speed (caused by the high braking torque originated by high transient currents during the short‐circuit). This effect is larger in smaller motors. The AC and DC components of the analysed currents have their own time constants, which are usually estimated from motor equivalent circuit. The application of the improved equation was useful to demonstrate that such a procedure does not lead to accurate results in case of the DC time constants of small motors. Finally, an example illustrates a case that cannot be well described by the equation from the IEEE Std. 551, whereas the result from the proposed equation is very similar to the measured current.

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Risk of Loss of Protection Coordination in Distribution Grids with High Penetration of Distributed Energy Resources

Yousaf

Muttaqi

Sutanto

2021

2021 IEEE Industry Applications Society Annual Meeting (IAS)

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IEEE Recommended Practice for Protection and Co-ordination of Industrial and Commercial Power Systems

Cited by 4 publications

References 0 publications

Design of Electrical Setting Protection System Indarung VI Cement Plant (Case Study New Cement Plant Construction at PT Semen Padang)

Design of Electrical Setting Protection System Indarung VI Cement Plant (Case Study New Cement Plant Construction at PT Semen Padang)

Improved equation to describe the induction motor currents during nearby three‐phase short‐circuits

Risk of Loss of Protection Coordination in Distribution Grids with High Penetration of Distributed Energy Resources

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