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# הגנת מרחק

## English translation: distance (relay) protection

 17:31 Oct 10, 2013
Hebrew to English translations [PRO]
Tech/Engineering - Electronics / Elect Eng / Electricity
 Hebrew term or phrase: הגנת מרחק צמד המילים האלו מופיע בערך 100 פעמים בתרגום באותו אופן דוגמאות: 1 - הערה כאשר ישנן שתי הגנות מרחק כל ההתראות מחוברות יחד למעט התראה מס' 38 2 - תקלה בהגנת מרחק של שדה X 3 - א .קווי גנרציה יצוידו בהגנות הבאות•הגנת מרחק (הגנה ראשונה) ועוד מן הסתם יש פה מיה נכונה בינתיים משתמש ב- distance protection אך זה ממש לא נשמע טוב או נכון אם מישהו יודע בוודאות אשמח לעזרה
 Local time: 18:53
 English translation: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
Selected response from:

Ty Kendall
United Kingdom
Local time: 16:53
 4 KudoZ points were awarded for this answer

3distance (relay) protection
 Ty Kendall
2screen
 cilantro

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

 Ty KendallUnited KingdomLocal time: 16:53Native speaker of: EnglishPRO pts in category: 12

3 days 11 hrs   confidence:
screen

Explanation:
Just a guess, but not completely wild

 cilantroIsraelLocal time: 18:53Specializes in fieldNative speaker of: English, ItalianPRO pts in category: 19

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