Results 141 to 150 of about 784,662 (197)

Current-differential protective schemes

1993
It will be clear from the previous chapter that overcurrent and earth fault protective equipment employing time grading and directional detection cannot provide correct discrimination on all power networks and in many instances the clearance times for some faults would not be acceptable.
C. Christopoulos, A. Wright
openaire   +1 more source

Distributed coordinated flexible current differential protection system

2006 China International Conference on Electricity Distribution (CICED 2006), 2006
Protection system will undergo profound evolution with the new feature coming forth with the formulation of new standard IEC 61850. Based on the flexibility come with the subscription/publish mechanism of the new standard, a new paradigm of current differential relaying are discussed in this paper.
null Sheng Su, null Xiangjun Zeng
openaire   +1 more source

Carrier-current differential protection for transformer banks

Electrical Engineering, 1943
WHEN carrier current was first applied to protective relaying of the directional type, it consisted of a simple telegraph channel. Subsequent developments have expanded the capabilities to the extent that each carrier channel for pilot relaying now may provide one or more of the following additional services:
openaire   +2 more sources

GPS synchronised current differential protection

6th International Conference on Developments in Power Systems Protection, 1997
A new technique for current differential feeder protection employing measurement synchronisation is described in this paper. The application of current differential protection to feeders can present several difficulties due to the distance between the relays at the line ends.
openaire   +1 more source

Current increment based DC differential protection method

2017 IEEE Conference on Energy Internet and Energy System Integration (EI2), 2017
Large scale application of renewable energy in distribution network generates more challenges for traditional protection methods. Longitudinal differential protection is a common backup protection method of DC system. It adopts measurements at the both ends of the line, and has a good performance in most cases except faults with high grounding ...
Yinglin Liu, Guomin Luo, Lin Zhou, Jinghan He, Ming Dai, Tianlei Zang   +5 more
openaire   +1 more source

Novel wavelet approach to current differential pilot relay protection

2003 IEEE Power Engineering Society General Meeting (IEEE Cat. No.03CH37491), 2002
Summary form only given. This paper describes a novel technique for current differential pilot relay protection (CDPR) by using wavelet analysis. PSCAD is used to generate current signals at both ends of a transmission line in a typical system with fault at various locations.
C. K. Wong, C. W. Lam, K. C. Lei, C. S. Lei, Y. D. Han   +4 more
openaire   +1 more source

Differential reactive current protection relay

Transactions of the American Institute of Electrical Engineers, Part II: Applications and Industry, 1953
The past few years have witnessed the increasing use of alternating current in large military aircraft, to the point where systems of paralleled alternators are required to meet the load demand. Such systems have problems and malfunctions of a type not encountered with isolated alternators or with paralleled d-c generators. As a result, new control and
openaire   +1 more source

Current differential protection using time-domain compensation of capacitive current

7th IET International Conference on Advances in Power System Control, Operation and Management (APSCOM 2006), 2006
A novel current differential protection using time-domain compensation of capacitive current is proposed. The capacitive current compensation is carried out in time domain using sampled data based on the differential equation of Π-equivalent circuit of the transmission line.
null Yining Zhang, null Jiale Suonan, null Bingyin Xu, null Zaibin Jiao   +3 more
openaire   +1 more source

Power Transformer Differential Protection Through Gradient of the Differential Current

Journal of Control, Automation and Electrical Systems, 2013
This paper presents a new methodology for identifying internal faults and inrush currents in power transformers based on the gradient of the differential current. The technique is to calculate the angle of the gradient vector along the curve of the differential current in the data window and through waveforms recognition techniques to identify the type
Raidson Jenner N. de Alencar, Ubiratan Holanda Bezerra   +1 more
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Design Criteria for Line Differential Current Protection Scheme

2021 IEEE/IAS 57th Industrial and Commercial Power Systems Technical Conference (I&CPS), 2021
Line current differential protection creates challenges for relay design and application. From a design perspective, the distributed nature of the line current differential system imposes limits on the differential current to enable the differential protection principle.
Naman Dwivedi, Manish Mishra
openaire   +1 more source