Influence of current transformer saturation on line current differential protection algorithms

Gangadharan, P.K.; Sidhu, T.S.; Klimek, A.

doi:10.1049/iet-gtd:20060138

Cited by 32 publications

(18 citation statements)

References 3 publications

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“…3 and 4 shows the behavior of and for a severe three phase bus fault. 3 We observe that the transmission-line steady-state phasor model is erroneous immediately after a fault. For a severe fault, model accuracy improves within two cycles.…”

Section: Error Analysis Using Dynamic Phasorsmentioning

confidence: 88%

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Adaptive Current Differential Protection Schemes for Transmission-Line Protection

Dambhare

Soman

Chandorkar

2009

IEEE Trans. Power Delivery

156

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Abstract-Throughout the history of power system protection, researchers have strived to increase sensitivity and speed of apparatus protection systems without compromising security. With the significant technological advances in wide-area measurement systems, for transmission system protection, current differential protection scheme outscores alternatives like overcurrent and distance protection schemes. Therefore, in this paper, we address this challenge by proposing a methodology for adaptive control of the restraining region in a current differential plane. First an error analysis of conventional phasor approach for current differential protection is provided using the concept of dynamic phasor. Subsequently, we extend the methodology for protection of series compensated transmission lines. Finally, we also evaluate the speed versus accuracy conflict using phasorlets. Electromagnetic Transient Program simulations are used to substantiate the claims. The results demonstrate the utility of the proposed approach.

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Section: Error Analysis Using Dynamic Phasorsmentioning

confidence: 88%

“…• approximate delay equalization between local and remote end current; 1 • current transformer (CT) inaccuracies, in particular errors due to saturation of the core in the presence of decaying dc offset current [3]. Conventional current differential schemes employing GPSsynchronized current measurements are discussed in [4]- [6].…”

mentioning

confidence: 99%

Adaptive Current Differential Protection Schemes for Transmission-Line Protection

Dambhare

Soman

Chandorkar

2009

IEEE Trans. Power Delivery

156

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“…As a system fault occurs, the fault current through the primary circuit of a CT can be considered as the superposition of a sinusoidal component and an exponential component, given by (1) where , , and are the initial value of the exponential component, amplitude of the sinusoidal component, decaying coefficient, and a fault inception angle, respectively.…”

Section: Ct Characteristics and Ct Saturation Detection And Compementioning

confidence: 99%

“…Distorted secondary currents, due to CT saturation, can cause measurement error and protection relay mal-operation [1]. Thus, the CT saturation problem has to be considered when a protective relay is designed.…”

Section: Introductionmentioning

confidence: 99%

Morphological Lifting Scheme for Current Transformer Saturation Detection and Compensation

Smith

2008

IEEE Trans. Circuits Syst. I

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Current transformer (CT) saturation can cause protective relay mal-operation or even prevent tripping. The wave shape of the secondary current is severely distorted as the CT is forced into deep saturation when the residual flux in the core adds to the flux change caused by faults. In this paper, a morphological lifting scheme is proposed to extract features contained in the waveform of the signal. The detection of the CT saturation is accurately achieved and the points of the inflection, where the saturation begins and ends, are found with the scheme used. This paper also presents a compensation algorithm, based upon the detection results, to reconstruct healthy secondary currents. The proposed morphological lifting scheme and compensation algorithm are demonstrated on a sample power system. The simulation results clearly indicate that they can successfully detect and compensate the distorted secondary current of a saturated CT with residual flux.

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“…Generally, if the fault current is high and contains a dc offset, the flux in the core of CT will enter the saturated region of the B-H curve, and the secondary current will be severely distorted [10]. References [11] and [12] analyze the CT saturation impact on current differential protection. Corresponding CT saturation detection methods are put forward in [13] and [14].…”

Section: Introductionmentioning

confidence: 99%

Novel principle and adaptive scheme of phase correlation line current differential protection

et al. 2013

Int. Trans. Electr. Energ. Syst.

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SUMMARYCurrent differential protection is widely used in transmission line due to its inherent simplicity and good performance. In order to strive to increase sensitivity of protection without compromising stability on external faults, phase correlation current differential protection is presented in this paper. Current phase difference is introduced to the differential current principle so as to improve the sensitivity and reliability of differential protection simultaneously. Comprehensive analysis and comparisons of performance characteristics in Alpha Plane demonstrate that phase correlation current differential protection has preferable performance than that of conventional current differential protection. As far as CT saturation is concerned, the proposed protection scheme has flexible adaptability to ensure significant improvement in sensitivity and dependability for internal faults while still improving stability for external faults. The performance of the proposed protection is investigated for various faults of transmission line simulated by Electro-Magnetic Transients Program including DC and record fault data from real power system. The test results show that the proposed protection has satisfactory operation performance.

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Influence of current transformer saturation on line current differential protection algorithms

Cited by 32 publications

References 3 publications

Adaptive Current Differential Protection Schemes for Transmission-Line Protection

Adaptive Current Differential Protection Schemes for Transmission-Line Protection

Morphological Lifting Scheme for Current Transformer Saturation Detection and Compensation

Novel principle and adaptive scheme of phase correlation line current differential protection

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