Insulation Requirement According to IEC 60950 A CL

Insulation Requirement According to IEC 60950

總結 A. CL要依據以下來確定: 1. 2. 3. 4. 5. 6. 絕緣類型 INPUT VOLTAGE RANGE; WORKING VOLTAGE (Vpeak); Pollution Degree; (Delta select Pollution Degree 3. ); Altitude; 計算方法: CL=A+B (A: Minimum value from Table 2 H, according to the mains voltage; B: Additional value from Table 2 J, according to the actual peak working voltage, A, B取值應看大) B. CR 要依據以下來確定: 1. 2. 3. 4. 5. 絕緣類型; WORKING VOLTAGE (Vrms); Pollution Degree; (Delta select Pollution Degree 2. ); Material Group; 計算方法: 利用Table 2 L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 - Appropriate Insulation System shall be adopted - UL R/C according to UL 1446 - 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 materials according to IEC 60085 - Material of the lowest temperature rating dominates - UL R/C materials accepted, e. g. tapes, bobbins.

Requirements of Construction – Materials (con’d)

Requirements of Construction – Insulation General – Based on Working Voltage - Clearance: (based on Vpk) A = Minimum value from Table 2 H(page 29), according to the mains voltage B = Additional value from Table 2 J(page 30), 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. 6 mm -Exception: If working environment of altitude above 2000 m is specified, Annex G shall be considered.

Requirements of Construction – Insulation (con’d) Example of Creepage Determination: 1. Measured working voltage = 360 Vrms 2. Pollution Degree 2 3. Material Group II Required creepage distance = 2 X From Table 2 L: (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 (con’d) Wound Components – Triple-Insulated Wires - Minimum 3 construction layers shall apply for Reinforced Insulation - Passes Annex U tests (Insulated Winding Wires 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 (con’d) Core - Usually considered as “floating” all surrounding components 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 “E 115982” Factory Location - “DCGM” - “DET” - “DEIC” - “DEIT” - “DCWM” System Designation - “MP-130 B” - “MP-130 G” - “MP-130 I” … etc.