《绝缘距离的计算.》由会员分享，可在线阅读，更多相关《绝缘距离的计算.（28页珍藏版）》请在金锄头文库上搜索。
1、Insulation Requirement According to IEC60950 安規距離計算安規距離計算-1 -1 直線及沿面直線及沿面 直線距離：Clearance distance = CL 定義：任何可能之最短路徑，且 CLCR。 沿面距離：Creepage distance = CR 定義：攀爬物體表面之最短路徑。 安規距離計算安規距離計算-1.1 -1.1 直線及沿面直線及沿面 如果導體之間利用絕緣作為阻隔，但是在無法確保兩個不 同物質間之連結性，故其CL/CR的計算方式如下： 利用開槽來延伸CR，則X必須大於1 mm，例： 安規距離計算安規距離計算-2 -2 工作電壓決定
2、距工作電壓決定距 離離 AC to DC Product, =150VacAC to DC Product, =150Vac CL： 輸入電壓150Vac的產 品，例如輸入為100- 127Vac，其基準值為： B/I = 1.0mm R/I = 2.0mm； 若Peak電壓高於210Vpk ，則必須加上其額外值 ！ 如右圖： 例：Vpk=302，則 B/I = 1.0 + 0.2 = 1.2 mm R/I = 2.0 + 0.4 = 2.4 mm 安規距離計算安規距離計算-3 -3 工作電壓決定距工作電壓決定距 離離 AC to DC Product, =300VacAC to DC Pro
3、duct, =300Vac CL： 輸入電壓150Vac 300Vac 的產品， 例如輸入為100-127Vac/200- 240Vac or 100-240Vac，其基 準值為： B/I = 2.0mm R/I = 4.0mm； 若Peak電壓高於420Vpk，則 必須加上其額外值！ 如右圖： 例：Vpk=604，則 B/I = 2.0 + 0.3 = 2.3 mm R/I = 4.0 + 0.6 = 4.6 mm 安規距離計算安規距離計算-4 -4 工作電壓決定距工作電壓決定距 離離 DC to DC Product, =210VdcDC to DC Product, =210Vdc CL
4、： 輸入210Vdc的 DC to DC Converter， 例如輸入為36 to 75Vdc ，則基準值為： B/I = 1.0mm R/I = 2.0mm； 如右圖： 例：Vdc=96，則 B/I = 1.0 mm R/I = 2.0 mm 安規距離計算安規距離計算-5 -5 操作高度與直線距離之關係操作高度與直線距離之關係 依據研究及IEC60664-1的規範，越高海拔的大氣壓力 越小，所以必須加長直線距離，用以符合原始所需之 安規要求，如下圖，以海拔10,000英呎(3,048公尺)為例 ，最終直線距離CL必須乘上海拔係數1.15倍。 安規距離計算安規距離計算-6 -6 工作電壓決定
5、距離工作電壓決定距離 CreepageCreepage (CR): (CR): 沿面距離沿面距離 沿面距離可 使用線性內 插法。 ！點入試算 安規距離計算安規距離計算-6.1 -6.1 線性內插法。 內插法通常定義爲根據”二個已知值估計出中間值”。線 性內插法在二個已知資料點間畫一條直線，新的資料點 就位於這條直線上，具體位置要根據其值與二個端點之 一的接近程度確定。 例如: Vrms = 280時,沿面距離為 3.0mm. 總結 A.CL要依據以下來確定: 1.絕緣類型 2.INPUT VOLTAGE RANGE; 3.WORKING VOLTAGE (Vpeak); 4.Pollution
6、 Degree;(Delta select Pollution Degree 3.); 5.Altitude; 6.計算方法:CL=A+B (A: Minimum value from Table 2H, according to the mains voltage; B: Additional value from Table 2J, 1. according to the actual peak working voltage,A,B取值應看大) 2. B.CR 要依據以下來確定: 3.絕緣類型; 4.WORKING VOLTAGE (Vrms); 5.Pollution Degree;(
7、Delta select Pollution Degree 2.); 6.Material Group; 7.計算方法:利用Table 2L已知兩點列直線方程求中間點. Safety Requirements for Transformers Construction - Materials - Insulation - Markings Performance - Temperature - Abnormal Tests - Electric Strength Test 1 Requirements of Construction - Materials UL/CSA - Appropria
8、te Insulation System shall be adopted - UL R/C according to UL1446 - Depending on temperature performance requirement of different applications (Class B, Class F, etc.) - Materials limited to the Insulation System Other Certifiers No “Insulation System” requirement - Classification of insulation mat
9、erials according to IEC 60085 - Material of the lowest temperature rating dominates - UL R/C materials accepted, e.g. tapes, bobbins. Requirements of Construction Materials (cond) Requirements of Construction Insulation General Based on Working Voltage - Clearance: (based on Vpk) A = Minimum value f
10、rom Table 2H(page29), according to the mains voltage B = Additional value from Table 2J(page30), according to the actual peak working voltage Required clearance = A + B - Example: 1. Equipment rated 100-240 Vac 2. Measured maximum working voltage 600 Vpk A = 4 mm, B = 0.6 mm Determined clearance = 4
11、.6 mm -Exception: If working environment of altitude above 2000 m is specified, Annex G shall be considered. Requirements of Construction Insulation (cond) Example of Creepage Determination: 1. Measured working voltage = 360 Vrms 2. Pollution Degree 2 3. Material Group II Required creepage distance
12、= 2X From Table 2L: (400 300)/(2.8-2.2) = (360 300)/(X-2.2) X = 2.56 2.6 Required creepage = 5.2 mm Requirements of Construction Insulation (cond) Wound Components Triple-Insulated Wires - Minimum 3 construction layers shall apply for Reinforced Insulation - Passes Annex U tests (Insulated Winding W
13、ires for Use Without Interleaved Insulation) - Where two wires cross each other at an angle between 45 - 90 , an additional physical separation shall be provided, e.g. by sheet material. 45 - 90 Requirements of Construction Insulation (cond) Core - Usually considered as “floating” all surrounding co
14、mponents shall keep Basic/Supplementary Insulation from core. - Some considered as primary/secondary all components on opposite side shall keep Reinforced Insulation from core. Requirements of Construction Marking Company name or trade mark “E115982” Factory Location - “DCGM” - “DET” - “DEIC” - “DEIT” - “DCWM” System Designation - “MP-130B” - “MP-130G” - “MP-130I” etc.
