Results 261 to 270 of about 127,637 (306)

Pilot protection communication channel requirements

57th Annual Conference for Protective Relay Engineers, 2004, 2004
Pilot relaying has been applied for transmission line protection since the 30's. The well known communication channels (pilot wire or power line carrier) are increasingly being replaced by digital channels. Dark fiber (dedicated fiber optic cable), multiplexed fiber optic systems (T1 and SONET) and 56 kbps phone lines (DDS - digital data service) are ...
S. Ward, T. Dahlin, B. Ince
openaire   +1 more source

A primer on pilot protection with digital relays

2015 68th Annual Conference for Protective Relay Engineers, 2015
The paper summarizes carrier aided distance protection schemes that have been used successfully for a very long time. Each scheme, their communication requirements have been discussed as well as their application conditions. It is noted that with the introduction of digital technology the capabilities of distance relays and their performance has been ...
Sinan Saygin, Ilia Voloh, Zhiying Zhang
openaire   +1 more source

An Evaluation of a Pilot Protected Mealtime Program in a Canadian Hospital

Canadian Journal of Dietetic Practice and Research, 2015
The study evaluated the impact of a pilot "protected mealtime" program on meal experience and care of hospitalized acute care patients. A 4-month pilot protected mealtime program was implemented on a 35-bed acute, older adult ward. A pre- and post-observational audit was implemented to examine interruptions during lunch, food intake, hand hygiene, and ...
Jan, Chan, Christine, Carpenter
openaire   +2 more sources

Pilot Protection Systems

2009
This chapter contains sections titled: Introduction Physical Systems for Pilot Protection Non-Unit Pilot Protection Schemes Unit Protection Pilot Schemes An Example of Extra High Voltage Line Protection Pilot Protection Settings Traveling Wave Relays Monitoring of Pilot Performance References ...
openaire   +1 more source

Incorrect Operations of Pilot Scheme with Ground Overcurrent Protection

2019 IEEE Canadian Conference of Electrical and Computer Engineering (CCECE), 2019
The incorrect operations of the pilot scheme Permissive Overreaching Transfer Trip (POTT) with ground overcurrent element are evaluated in this paper. The practical experience of several in practice incorrect operations are gathered to list the associated reasons in setting relay steps.
F. A. O. Gouveia, Washington L. A. Neves, Ricardo L. A. Reis   +2 more
openaire   +1 more source

Pilot-wire protection of transmission lines

Electrical Engineering, 1960
THE PRESENT pilot-wire protective systems for transmission lines employing leased pilot-wire circuits are an outgrowth of conventional differential protective systems for other types of electric apparatus. Thus, these line-protective systems are characterized by the fact that the pilot wires are part of the differential connection between the current ...
openaire   +1 more source

Pilot Backup Protection Based on Wireless Communication

2017 Ninth Annual IEEE Green Technologies Conference (GreenTech), 2017
The paper presents a back-up protection scheme for loop system from all types of fault based on the directional element. The traditional back-up protection schemes such as distance protection and overcurrent protection are not suitable for the loop system.
Zhenmin Tang, Qiushi Wang, George Karady
openaire   +1 more source

Anti-dazzling protection for Air Force pilots

SPIE Proceedings, 2012
Under certain conditions, laser directed at aircraft can be a hazard. The most likely scenario is when a bright visible laser causes distraction or temporary flash blindness to a pilot, during a critical phase of flight such as landing or takeoff. It is also possible, that a visible or invisible beam could cause permanent harm to a pilot's eyes.
Ariela Donval, Tali Fisher, Ofir Lipman, Moshe Oron   +3 more
openaire   +1 more source

Application of digital radio for distribution pilot protection

2008 IEEE Rural Electric Power Conference, 2008
The traditional solutions for protecting networked distribution lines, sub-transmission lines, and industrial facility incoming supply lines use some form of pilot protection. A significant challenge for pilot protection, especially in retrofit situations, is the cost of installing pilot communications channels.
Rich Hunt, Mark Adamiak, Steel McCreery, Al King   +3 more
openaire   +1 more source

Pilot Protection Applied in Distribution Network with DG

Advanced Materials Research, 2012
Abstract: Once DG is connected into distribution system, the system will turn from single-source radical network to multi-source network. The power flow will also be changed, which might lead to unreliability of the relay protection. Firstly, the paper analyzes the factors which cause these issues, and then proposes a method to accomplish the procedure
Yu Sheng Zhou, Yi Yang, Pan Zheng, Jian Wu Zheng   +3 more
openaire   +1 more source