Results 211 to 220 of about 130,007 (263)

Impedance-Differential Protection: A New Approach to Transmission-Line Pilot Protection

IEEE Transactions on Power Delivery, 2015
Differential protection is able to provide the most selective protection compared with other protective schemes. In this paper, a new differential scheme is proposed for pilot protection of transmission lines. The concept of differential impedance ( ${\rm Z}_{\rm diff}$ ) is introduced using the synchronous voltages and currents of both terminals of
Tohid Ghanizadeh Bolandi, Heresh Seyedi, Sayyed Mohammad Hashemi   +2 more
exaly   +2 more sources

Protection of Pilot-Wire Circuits

Transactions of the American Institute of Electrical Engineers, 1942
THIS paper reviews the problem of protecting pilot-wire circuits, briefly discusses the sources of disturbing voltages, describes two types of neutralizing transformers, and illustrates how they are used to distribute the disturbing voltage most favorably throughout the pilot-wire circuit.
E. L. Harder, M. A. Bostwick
openaire   +2 more sources

Pilot wire relay protection

Electrical Engineering, 1935
Recent developments in relay protective schemes, using metallic pilot channels for isolating a transmission line during fault conditions, reduce conditions, considerably the magnitude of the currents which must be handled. Schemes recently developed have many other advantages over the older pilot wire schemes being more economical to install and ...
E. E. George, W. R. Brownlee
openaire   +1 more source

Protection of Pilot Wires From Induced Potentials

Transactions of the American Institute of Electrical Engineers, 1946
The use of pilot-wire relays for protection of power transmission circuits usually requires a reliable pilot channel which is free of any induced potentials Which may cause transient voltages to appear between wires even though they may be of relatively low magnitude.
R. B. Killen, G. G. Law
openaire   +1 more source

Justifying pilot protection on transmission lines

2010 63rd Annual Conference for Protective Relay Engineers, 2010
This paper concerns the justification of the use of pilot protection on transmission lines.
Gary Kobet, Bogdan Kasztenny, Mark Allen, Art Buanno, Albert N. Darlington, Alla Deronja, Hyder DoCarmo, Jerry Finley, George Gresko, Larry Henriksen, Mike Jensen, Bill Kennedy, Kazik Kuras, Vahid Madani, Walter McCannon, Mike McDonald, John Miller, Mukesh Nagpal, Jim O'Brien, Frank Plumptre, Elmo Price, Sam Sambasivan, Mark Simon, Jian Cheng Tan, Ilia Voloh, Solveig Ward, Ray Young   +26 more
openaire   +1 more source

Protective films for pilot‐plant deodorizers

Journal of the American Oil Chemists' Society, 1951
SummaryWith mild agitation, soybean oil is not appreciably contaminated by contact with clean steel surfaces unless the fatty acid content is above 0.1% and the temperature above 150°C.It has been shown that an oxidized oil film is an effective coating for metals used in the construction of pilot‐plant deodorizers.
R. E. Beal, E. B. Lancaster
openaire   +1 more source

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