A Current Differential Relay for a 1000-kV UHV Transmission Line

Zhang, Xu; Du, Zhi; Li, Ran; Wu, Yuchong; Qi, Yang; He, Jiali

doi:10.1109/tpwrd.2007.900274

Cited by 111 publications

(71 citation statements)

References 4 publications

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“…With the rapid development of optical fiber communication technology, current differential protection, owing to its simplicity of principle, higher sensitivity and inherent ability of phase selection, has been extensively used [18]. Current differential relaying works on the detection of the unbalance in current flow into and out of a definite protected zone and it is especially attractive to subtransmission systems since the dynamic changes of power system impedance and power direction are solved in a simple and elegant manner.…”

Section: Traditional Protective Principlesmentioning

confidence: 99%

Development and research on integrated protection system based on redundant information analysis

Liu

et al. 2016

Prot Control Mod Power Syst

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Facing the growth of energy demand and the worldwide interests in renewable energy sources, smart grid has been proposed in order to accommodate the needs of power grid development. In China, digital substations have been widely applied. Moreover, as the worldwide interest and development in smart grid have increased significantly, the digital information availability and communication capability of modern substation have been improved. Different with traditional substation protection configuration based on local information, Integrated Protection (IP) is used to denote the integration of several protective devices for multiple power equipment within the substation into one protective relay, obtaining all the real time information of the substation by communication network. The analysis of sharing information and cooperation among different protection functions helps to realize more reliable and sensitive fault detection. This paper describes several different integrated protection schemes and their respective advantages and disadvantages. The principles and functions applied in integrated protection systems are addressed to provide an overview of the current state of the technology. A new coordinated protection system based on inter-substation information is proposed and simulation study is discussed to verify the improved reliability and sensitivity.

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Section: Traditional Protective Principlesmentioning

confidence: 99%

Development and research on integrated protection system based on redundant information analysis

Liu

et al. 2016

Prot Control Mod Power Syst

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“…The -equivalent circuit is an "exact" two-port equivalent of (11) and (12). In that sense, methods based upon -equivalent model are equivalent to method proposed in [7] which uses an explicit long line model.…”

Section: Error Analysis Using Dynamic Phasorsmentioning

confidence: 99%

“…In traditional pilot wire schemes, relaying sensitivity will have to be compromised to prevent the mal-operation. Reference [7] proposes a current differential relay which uses distributed line model to consider line charging current. An adaptive GPS-synchronized protection scheme using Clarke transformation is proposed in [8].…”

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confidence: 99%

Adaptive current differential protection schemes for transmission-line protection

Dambhare

Soman

Chandorkar

2010

IEEE PES General Meeting

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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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“…The main reason for using this relay type is due to their simplicity and high sensitivity. So, with the development of digital relays and communication technology, current differential relays have also been used for the protection of transmission lines [4,5,6]. However, when this relay type is applied to transmission lines there are some problems such as sampling misalignment, time delay of the communication channel, line capacitive charging current and errors in current transformers make current comparison difficult to achieve.…”

Section: Introductionmentioning

confidence: 99%

A current differential line protection using a synchronous reference frame approach

Pires

Guerreiro²

2008

IET 9th International Conference on Developments in Power Systems Protection (DPSP 2008)

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This paper presents a new approach for a current differential protection of the transmission lines. This approach is based on the Park transformation or ABC-dqo transformation. Using the ABC-dqo transformation the three phase quantities are transformed into a synchronous rotating reference frame. In this way, the line currents of the three phase system are measured and transformed into three dc components. So, immunity to problems such as sampling misalignment and time delay of the communication channel will be improved. Several test results are presented in order to show the effectiveness of the proposed approach.

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A Current Differential Relay for a 1000-kV UHV Transmission Line

Cited by 111 publications

References 4 publications

Development and research on integrated protection system based on redundant information analysis

Development and research on integrated protection system based on redundant information analysis

Adaptive current differential protection schemes for transmission-line protection

A current differential line protection using a synchronous reference frame approach

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