ลูกถ้วยหลักก้านตรงรับสายไฟฟ้า :
พอร์ซเลน แบบ 56 / 57-4

TIS.2623 Part 7(2)-2564 Type 56 / 57-4
DIMENSIONS
Leakage distance, minimum, mm 953
Protected leakage distance, minimum, mm 483
MECHANICAL VALUES
Cantilever strength, kN 12.5
Cantilever proof load, kN 5
ELECTRICAL VALUES
Low-frequency dry flashover, kV 140
Low-frequency wet flashover, kV 95
Critical- impulse flashover, positive, kV 225
Critical- impulse flashover, negative, kV 300
RADIO INFLUENCE VOLTAGE DATA
Low-frequency test voltage, rms to ground, kV 44
Maximum RIV at 1000 kHz, microvolts 200
Colour of Insulator BROWN
Weight of Insulators, kg 14.5