单根电线的耐压测试

stevenyu · 发表于 2009-7-31 16:27

UL 2556中對絕緣耐壓測試有三種方式.
6.2 Dielectric voltage-withstand
6.2.1 Scope
This test establishes the methods for determining the dielectric voltage-withstand of a wire or cable.
6.2.2 Apparatus
The apparatus shall consist of
a) an isolation transformer capable of supplying a test potential of 48 to 62 Hz, whose output
potential is continuously variable from near zero to at least the specified rms test potential;
b) a voltmeter having an accuracy of ±5%, on the high voltage side of the transformer. If
analog, it shall have a response time that does not introduce a lagging error greater than 1% of
full scale at the specified rate of increase in voltage;
c) a fault current indicator;
d) a forced-air oven as described in Clause 4.2.3 Item (i), having insulated bushings for
connection of the test voltage while the oven is closed;
e) a temperature-measuring device with an accuracy of ±1 °C;
f) a tank filled with tap water; and
g) a means of grounding, maximum impedance of 15W.
6.2.3 Preparation of specimens
6.2.3.1 Method 1 (in water)
Both ends of the individual conductors shall be made bare.
In preparing the wire for test, each end of the specimen shall be brought out well above the water level
in the tank, where applicable, and the covering removed from the surface of the insulation for a short
distance if necessary to prevent surface leakage. The temperature of the water in which the specimen is
immersed need not be controlled unless specified in the product standard.
Unless specifically required by the product standard, a shielded or metal-covered single-conductor
specimen need not be immersed in water, the test voltage being applied between the conductor and the
shield or metal covering.
Unless specifically required by the product standard, a multiconductor cable need not be immersed in
water, the test voltage being applied between each conductor and the electrode, consisting of all other
conductors connected together and to all shields and metal coverings, as applicable.
In all cases, the ends of the conductor of the specimen shall be spaced from the grounded electrode a
sufficient distance to prevent corona or flashover at the ends during application of the test voltage.
6.2.3.2 Method 2 (in air)
Both ends of the individual conductors shall be made bare.
For a single-conductor cable, a grounding electrode, when not present as a component, shall be applied.
A snug-fitting close-weave copper braid, a metallic tape, or graphite have been found to be acceptable.
6.2.3.3 Method 3 (in air at elevated temperature)
Both ends of the individual conductors shall be made bare.
For a single-conductor cable, a grounding electrode, when not present as a component shall be applied.
A snug-fitting close-weave copper braid, a metallic tape, or graphite have been found to be acceptable.

zy3618 · 发表于 2010-6-25 23:44

浸水，或在空气中

pz02010 · 发表于 2010-6-26 11:26

本人认为都可以，但是从个方面考虑和看的实验来说，才用绝缘包铝铂只最使用的。
虽然存在偏差，但是几千伏的电压也不会太在乎那些，再说耐压测试机本身的电压也是存在电压不稳的可能，所以为了安全和方便，本人支持绝缘包铝铂

jeremyho88 · 发表于 2010-6-26 14:28

要说方便与安全，在水中并无什么不妥。水箱外面有水也无妨，反正是接在低压端，不存在安全性。金属箔包覆在电线外表，如果电线长的话，就不太方便

keyou · 发表于 2010-6-26 16:50

引用第9楼wwnw_007于2009-07-31 16:15发表的 :
2 k& N( h. o7 q+ r- D水浴法是标准要求的方法，一是采用塑料盆，外表不能湿；二是采用金属盆，需要接地，此方法只须高压棒接触电线芯就行，三是采用标准的水槽，四是采用金属箔包裹电线绝缘外，也可以的。

一、二、四方法，水温如何控制？

pz02010 · 发表于 2010-6-28 10:45

水温控制可以通过恒温水箱来控制，但是短一点还没什么关系，但是200~300M

jeremyho88 · 发表于 2010-6-28 11:46

耐电压测试需要加温吗？还是第一次听说

bub01 · 发表于 2010-6-28 11:54

今天受教了，我还不知道有水浴法，我只知道外部包裹铝箔进行耐压！

yycchh · 发表于 2010-6-28 12:02

标准要求应该是用水槽！

jiejie · 发表于 2010-6-28 17:26

我们公司都是放到水槽里面测试的，放水中测试的结果更准确~！

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[线缆测试] 单根电线的耐压测试