A digital protection technique for parallel transmission lines using a single relay at each end

Gilany, Mahmoud; Malik, O.P.; Hope, G.S.

doi:10.1109/61.108897

Cited by 55 publications

(24 citation statements)

References 10 publications

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“…R arc represents the arc resistance. The value of arc resistance is considered as 0.5 V for both types of inter-circuit faults [20]. As the ground path is involved in phase-to-phase-toground type of fault, the value of fault-resistance plays a key role in the measurement of apparent impedance.…”

Section: Resultsmentioning

confidence: 99%

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New adaptive digital distance relaying scheme for double infeed parallel transmission line during inter-circuit faults

Makwana¹,

Bhalja²

2011

IET Gener. Transm. Distrib.

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Section: Resultsmentioning

confidence: 99%

“…1 and 2 that the value of arc resistance is very small during the early stage of an arc and hence, its value does not exceed 0.5 V for both types of inter-circuit faults [20]. Moreover, the voltage drop produced by an arc resistance is also neglected.…”

Section: Impedance Measured By the Proposed Schemementioning

confidence: 98%

New adaptive digital distance relaying scheme for double infeed parallel transmission line during inter-circuit faults

Makwana¹,

Bhalja²

2011

IET Gener. Transm. Distrib.

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“…Some of the situations that have to be carefully looked into when designing a protection scheme for a parallel transmission lines paralleled along the same right-ofway are mutual coupling of zero sequence currents, high-fault resistance, inter-circuit faults, single-end supply, and remote end fault located in the vicinity of remote bus. Many transmission line relaying scheme have been proposed to solve the problems associated with double-circuit lines [3][4][5][6][7]. But none of these solutions could completely solve the problem as they might fail either in differentiating internal and external faults or in classifying inter-circuit faults.…”

Section: Introductionmentioning

confidence: 98%

Percentage Differential Protection of Double-circuit Line Using Wavelet Transform

Bhalja

Maheshwari

2007

Electric Power Components & Systems

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This article presents development of a new percentage differential protection scheme for double-circuit transmission line using wavelet transform (WT). The work presented addresses the problems encountered by conventional distance relays when protecting double-circuit transmission lines sharing the same right of way. By the use of powerful analyzing and decomposing features of WT, a new technique is presented that takes care of the problems faced by pilot independent distance relay. The suggested technique depends on the six line currents of the two parallel lines at each end. The idea of the protection algorithm is based on the percentage of the difference of the two line current of each corresponding phase at each terminal. The measured six line currents at the relay location are decomposed into three levels of decomposition using the db4 mother wavelet. The summation of third level approximation coefficients are used as bias current whereas third level detailed coefficients are used as differential current. The proposed method eliminates many of the problems associated with double-circuit lines, such as high fault resistance, cross-country fault, mutual coupling effects, remote infeed, and avoids the problem of single-end supply. The stability of the relay under varied system configurations and operating conditions is examined. The relay algorithm is tested for various probable fault inception angles and loading conditions and with varying fault resistance between 0-150 ohms. The proposed wavelet based scheme provides encouraging results for different fault and system conditions. Relaying signals under different fault conditions were obtained by simulating the system using PSCAD/EMTDC.

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“…Reliability and tripping times of both schemes are negatively affected during communication channel failure. Thereafter, many relaying schemes have been proposed to solve the problems associated with doublecircuit transmission lines [6][7][8][9][10]. But all of these methods suffer from the problems such as mutual coupling, current and/or voltage reversal, misclassification of inter-circuit faults, improper discrimination between internal and external faults, and the need for simultaneous opening and closing of circuit breakers.…”

Section: Introductionmentioning

confidence: 99%

Protection of Double-circuit Transmission Line Using Superimposed Current

Bhalja¹,

Purohit

2011

Electric Power Components and Systems

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This article presents a differential protection scheme for a double-circuit transmission line using a superimposed component of current. The proposed scheme is based on the ratio of directional current difference setting value to directional current bias setting value of the respective phase at both ends. These two quantities are derived based on the difference and the summation of the superimposed currents of the respective phase. The proposed scheme provides proper discrimination between in-zone faults and out-of-zone faults during complete loss of generation at one of the buses. Further, it is highly sensitive toward high-resistance faults and provides instantaneous operation to the entire line. Moreover, the relay provides reliability and selectivity for discriminating cross-country faults and internal faults and remains stable against external faults. The proposed scheme has been tested under different fault conditions with varying fault resistance between 0-200 . A series of tests using test signals generated by PSCAD/EMTDC (Manitoba HVDC Research Centre Inc., Winnipeg, Manitoba, Canada) on realistic data of a part of the Indian 400-kV power transmission system network have proved the accuracy and effectiveness of the proposed scheme.

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A digital protection technique for parallel transmission lines using a single relay at each end

Cited by 55 publications

References 10 publications

New adaptive digital distance relaying scheme for double infeed parallel transmission line during inter-circuit faults

New adaptive digital distance relaying scheme for double infeed parallel transmission line during inter-circuit faults

Percentage Differential Protection of Double-circuit Line Using Wavelet Transform

Protection of Double-circuit Transmission Line Using Superimposed Current

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