Results 11 to 20 of about 635 (126)

Design of Mine-used Protection Device for Override Trip

open access: yesGong-kuang zidonghua, 2012
The paper analyzed causes of override trip of underground power supply lines based on characteristics of multi levels and short lines of power supply lines of coal mine underground, designed a reverse locking type longitudinal protection device for ...
GENG Qing-e
doaj   +1 more source

An Anti-Override Trip System Based on Principle of Zone Protectio

open access: yesGong-kuang zidonghua, 2012
The paper introduced an anti-override trip system based on principle of zone protection, described basic idea and working process of zone protection technology and generating and control logic of blocking signal in details, and analyzed an example of ...
ZHAO Fu-yu
doaj   +1 more source

Technology for leakage fault prevention and anti-override trip in coal mine intelligent power supply system and its development prospect

open access: yesMeikuang Anquan
The research on leakage and anti-tripping technology of coal mine power supply system is carried out, involving two parts: high voltage power supply system and low voltage power supply system.
Jianwen ZHAO, Fuyang ZENG, Yuyang ZHAO
doaj   +2 more sources

Research of preventing override trip scheme of coal mine underground based on GOOSE

open access: yesGong-kuang zidonghua, 2013
In order to solve problem of frequent override trip in high-voltage distribution network of coal mine underground, the paper analyzed causes of override trip in underground high-voltage distribution network and problems of common solutions in application
MA Xing-he   +2 more
doaj   +1 more source

Protection technology of coal mine power based on GOOSE network with information sharing

open access: yesGong-kuang zidonghua, 2015
For problems of override trip in short-circuit fault and fault line selection in single-phase earth fault of coal mine power system, a protection technology of coal mine power based on GOOSE network with information sharing was proposed.
YAO Fuqiang, BAI Meng, ZOU Wenbing
doaj   +1 more source

Status and prospect of microcomputer protection device for mine-used high-voltage explosion-proof switch

open access: yesGong-kuang zidonghua, 2018
Status of microcomputer protection device for mine-used high-voltage explosion-proof switch was introduced from aspects of hardware structure and basic functions.
LU Donggui, RONG Xiang, ZENG Ke
doaj   +1 more source

Celluloid Saviours: Angels and Reform Politics in Hollywood Film, by Emily Caston

open access: yesAlphaville: Journal of Film and Screen Media, 2012
The emergence of the term film blanc as a category for Hollywood films is a relatively new development. Peter L. Valenti was one of the first film scholars to use this term in 1978 to describe those Hollywood films that “show contemporary Americans ...
Mithuraaj Dhusiya
doaj   +1 more source

New technologies and new equipments of coal mine monitoring

open access: yesGong-kuang zidonghua, 2015
The paper analyzed the national coal production,the total number of accidents, the death rate per million tons and the changes of serious accidents. On average per year, the coal production had increased by 194 million tons, the number of accidents had ...
SUN Jiping
doaj   +1 more source

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