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Insert 179
(Extract from the CEE Publication 17, dated 1958)
The insulating material components containing voltage-carrying parts
must resistant creepage current. the surface. the results are doubtful, the test must repeated
with new set test objects.9 The circuit includes overcurrent relay that has a
minimum triggering delay 0.
. When the electrodes are short-circuited, the total impedance of
the circuit adjusted variable resistor for current 1.
A flat surface the test object with area least (if
possible) placed horizontal position. The drop volume ±5-mm3.
The electrodes are connected 175-VA(/50-Hz source (practically
sinusoidal). The entire
width both rounded edges must contact the test object.
This test not performed with equipment rated nominal voltages V
or less. The solution is
dropped from height mm.
The interval between the drops seconds.
A revision this testing method pending.1 A,
for cos 0.
Each electrode exerts force approx. The solution’s
volume resistivity 400 ohms 25° This equivalent a
concentration approx 0.
The electrodes must clean, properly rounded and properly positioned at
the start every test.
Non-ceramic materials are tested specified below. 4.1%.0 ±0.
Two electrodes, made sintered Wolfram carbide another sufficiently
corrosion-proof material and whose dimensions comply with Fig.
There may breakdowns sparkovers between the electrodes before a
total drops have been applied.215, are
placed the surface the test object, shown this figure.5 seconds.
The surface the test object moistened between the two electrodes with
drops solution ammonium chloride and distilled water
