What is a zero insulator
is an important index of the insulator is its insulation level. According to the DL - T596- Requirements of the '1996' regulations of power equipment preventive test, every piece of suspension insulator insulation resistance should not be less than 300 ohms, 500 kv suspension insulator not less than 500 ohms. Below that level, is generally considered to be low or zero insulator. In popular culture, is the insulation resistance is zero, zero insulator has lost the insulation detection zero, the purpose of the insulator is in order to prevent run timely find zero insulator, change in time, prevent the breakdown of insulator string. Operating conditions due to the insulator charged, the use of cremation clearance method is simple and effective. Not need to use the shake table operation under the condition of test, test more troublesome.
refers to the zero value insulator suspension insulator string in the operation of the electrical potential difference on both ends of insulator is zero.
according to DL/T596 - Requirements of the '1996' regulations of power equipment preventive test, every piece of suspension insulator insulation resistance should not be less than 300 ohms, 500 kv suspension insulator not less than 500 ohms. Below that level, is generally considered to be low or zero insulator.
by DL/T626 - 2005 'degradation disc suspension insulator testing regulation regulation:
(1) 500 kv voltage level, insulator insulation resistance less than 500 m Ω, sentence to degrade insulator;
(2) under 500 kv voltage level, insulator insulation resistance less than 300 m Ω, sentence to degrade insulator.
usually, for the deterioration of insulation resistance for more than 10 m Ω insulator called low-value insulator, and the insulation resistance is under 10 m Ω called zero insulator.
high voltage transmission lines, the conductor is relying on 'insulator string' - to tower - - - - - - - - - - - - 'Porcelain insulator string' of the insulation, with the passage of time, the outdoor weathering, voltage function for a long time, there may be individual not insulation porcelain vase, not the role of insulation; Because of the porcelain insulation damaged, insulation resistance is close to 0, take on the porcelain insulator string voltage value is close to zero, so called 'zero porcelain'. Although all left margin at the circuit design, but if not timely will have to change, breakdown of porcelain have another broken, shall not be able to, you will probably happen wire voltage breakdown all good porcelain ( The remaining porcelain) Caused by single phase grounding, affect the normal power supply. To prevent the above situation, will be measured on a regular basis, will find bad porcelain; But in order to guarantee the continuous reliability of power supply, and can't test power, the electric measurement was invented porcelain method; Discharge gap method currently used test. When measuring, will test the two electrodes in contact at both ends of the insulator ( Metal parts) , according to the size of the spark gap discharge spark to judge the stand or fall of insulator, such as no spark, this is zero insulator.
this article collected by the Beijing heng insulator manufacturer network released, reproduced please indicate.
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