High voltage Tailfeng lan cable
conductor layer between the conductor and metal net electric field distribution in the head end more densely, especially no metal bell grounding cable is the electric field distribute more densely, make the cable short is punctured.
So what should we check the breakdown of bearing?
First: measurement of dc resistance, wire clip to clamping conductor (
Steel belt, etc. )
Touching resistance, reduce the human form.
Second, although sometimes have high voltage breakdown, but with still has infinite resistance when resistance meter measurement, can play again high pressure.
Third: can only use resistance meter measure out numerical can, need not tube breakdown point touch resistance, due to the derivation of the formula has nothing to do with the touch of breakdown point resistance.
Fourth: L1 and L2 as cable wire or single core cable wire and steel belt (
Copper tape screened)
, a, b, c, d four endpoints of the wire respectively.
X to wire at one end to the breakdown point interval, L for the entire length of the Tailfeng lan cable.
In order to facilitate understanding, let's get the resistance of the conductor to the centralized from breakdown point to both sides, the dc resistance of four conductors respectively R1, R2, R3 and R4, breakdown point touch resistance for R5.
Set A = R1 + R5 + R3, use dc resistance meter to measure the readings obtained two points A and c;
B = R2 + + R4 R5, use of dc resistance meter measuring B and d of the two readings.
Then A + B is equal to the resistance of L1 and L2 plus 2 times the breakdown point of A touch resistance, so the breakdown point touch resistance is: the R5 = [
A + B -
/ 2, in which R1 + R2, R3 and R4 is the sum of the resistance of the L1 and L2, measurement is very brief.
Using ohm's law, conductor resistance and its length is proportional to the contact, can list the following: X/L = (
= / (
= / that X = X L /, X = (
Practice can using this formula, we can see, in the above hypothetical resistor R1, R2, R3 and R4 and R5 resistance there is no direct measurement, also did not directly used in calculation, only indirectly to use them, making it a brief.
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