הגנת מרחק
English translation: distance (relay) protection
| 17:31 Oct 10, 2013 |
| Hebrew to English translations [PRO] Tech/Engineering - Electronics / Elect Eng / Electricity | |||||||
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|  Selected response from: Ty Kendall United Kingdom Local time: 00:09 | ||||||
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| 3 | distance (relay) protection |
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| 2 | screen |
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Answers
1 day 15 hrs confidence: 
distance (relay) protection Explanation: I think you may be right, see: http://en.wikipedia.org/wiki/Power_system_protection#Types_o... "Distance (Impedance Relay)– Distance protection detects both voltage and current. A fault on a circuit will generally create a sag in the voltage level. If the ratio of voltage to current measured at the relay terminals, which equates to an impedance, lands within a pre-determined level the circuit breaker will operate. This is useful for reasonable length lines, lines longer than 10 miles, because its operating characteristics are based on the line characteristics. This means that when a fault appears on the line the impedance setting in the relay is compared to the apparent impedance of the line from the relay terminals to the fault. If the relay setting is determined to be below the apparent impedance it is determined that the fault is within the zone of protection. When the transmission line length is too short, less than 10 miles, distance protection becomes more difficult to coordinate. In these instances the best choice of protection is current differential protection." And also... "Distance relay The most common form of protection on high voltage transmission systems is distance relay protection. Power lines have set impedance per kilometre and using this value and comparing voltage and current the distance to a fault can be determined. The ANSI standard device number for a distance relay is 21.It is also called as the impedance relay as it calculates the line fault with the use of the impedance per meter of the transmission line" http://en.wikipedia.org/wiki/Protective_relay#Distance_relay |
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3 days 11 hrs confidence:
screen Explanation: Just a guess, but not completely wild |
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