64/110kv代表著voltages of 110 kv yjlw03,02的額定電壓等級--《南網附錄2014》
gb/z 額定電壓220 kv 交聯聚乙烯絕緣電力電纜及其附件
power cables with cross-linked polyethylene insulation and their accessories for rated
voltages of 220 kv
gb/t 22078-2008 額定電壓500 kv 交聯聚乙烯絕緣電力電纜及其附件
power cables with cross-linked polyethylene insulation and their accessories for rated
voltages of 500 kv
四、使用特性 operating characteristics
1、 額定電壓 rated voltage
電纜額定電壓用u0/u 和um 表示。
rated voltage of cable is described as u0/u and um.
u0—電纜設計用的導體對地或金屬屏蔽之間的額定工頻電壓;
u-電纜設計用的導體間的額定工頻電壓;
um-設備可承受的“高系統電壓”的大值。
notes:
u0:rated a.c. voltage between conductor and ground/l screen;
u:rated a.c. voltage between conductors
um:the maximum system voltage which the equipments can be beared。
額定電壓如下:
u0/u=50/66,um=72.5;
u0/u=64/110,um=126;
u0/u=127/220,um=252;
u0/u=290/500,um=550。
2、 導體額定工作溫度the rated temperature of conductor
電纜導體的高額定工作溫度為90℃。
短時過負荷溫度105℃。
短路時(長持續時間不超過5s)電纜導體的高溫度不超過250℃。
the maximum assigned temperature of the cable conductor is 90℃.
short time over current temperature is 105℃.
during having a short circuit, lasting less than 5 seconds, the maximum temperature of the cable conductor
shall not be above 250℃.
3、 安裝彎曲半徑the bend radius
安裝時電纜小彎曲半徑為電纜直徑的25 倍。
the minimum bend radius is 25d.
4、 電纜敷設時導體大允許牽引力和電纜大允許側壓力
the maximum allowed haul-off force and lateral pressure of cable
導體大允許牽引力計算方法:
the calculating method of the maximum allowed haul-off force :
——銅導體(cu):f=70×s(n/mm2)。
——鋁導體(al):f=40×s(n/mm2)。
側壓力計算方法:the calculating method of the maximum allowed lateral pressure:
p=f÷r(n/m),大允許側壓力不超過3000n/m。
p=f÷r(n/m),the maximum allowed lateral pressure≤3000n/m
式中:f-牽引力,n; f-lateral pressure,n;
s-導體截面,mm2; s-conductor section,mm2;