A Method of Improving Thermal Response Speed of Low-Voltage Arrester
A lightning arrester and thermal response technology, applied in the field of arresters, can solve the problems of inability to apply low-voltage systems, low rated voltage/operating voltage of the arrester, and inability to break down the air gap, so as to avoid the action response lag of the disconnector, reduce fault heat loss, Accident prevention effect
Active Publication Date: 2020-09-25
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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Problems solved by technology
[0014] Existing external hot-melt disconnectors or thermal-explosive disconnectors are only suitable for high and medium voltage systems, and cannot be applied to low voltage systems below 0.5kV
The reason is that the rated voltage / operating voltage of the arrester in the low-voltage system below 0.5kV is low, the air gap between the two electrodes cannot be broken down, and the arc cannot be generated in the thermal-explosive disconnector, resulting in thermal-explosive disconnector Unable to detonate thermal explosive element to achieve ground lead "disengagement"
However, because the heat-melt disconnector is used externally, the heat generated by the fault current cannot be transmitted to the disconnector, so the disconnector cannot operate
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[0043] The present invention will be further described below in conjunction with the accompanying drawings.
[0044] In order to facilitate the understanding of this technical solution, several confusing technical issues are explained as follows:
[0045] 1. Low-voltage arresters are mainly used to prevent insulation damage caused by lightning. Therefore, for low-voltage arresters in the national standard, there are no residual voltage indicators for operation and steep wave impulse current.
[0046] 2. Due to the excellent non-linearity of the zinc oxide resistor, it can quickly discharge the current and reduce the lightning voltage amplitude under the nominal lightning impulse current, so there will be no power frequency short-circuit current.
[0047] 3. For low-voltage arresters, the short-circuit current is caused by the deterioration of the resistor sheet (also known as the valve sheet), which causes the leakage current to increase, causing the resistor sheet to heat up,...
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The invention relates to a method for increasing a thermal response speed of a low-voltage arrester and belongs to the field of arresters. A built-in hot melting separation component is arranged on the lower end of a low-voltage arrester main body; a bowl-shaped rubber sleeve is arranged on the periphery of a lower polar plate of the low-voltage arrester main body; a central hole is formed at thecenter of the bowl-shaped rubber sleeve; a guide pipe is arranged in the central hole of the bowl-shaped rubber sleeve; the built-in hot melting separation component is coaxially arranged in the guidepipe. According to the method for increasing the thermal response speed of the low-voltage arrester, the bowl-shaped rubber sleeve structure is arranged on the periphery of the lower polar plate, soas to effectively reduce the fault heat loss of the arrester, guarantee sufficient heat for making a low-temperature hot melt medium layer enter into semi-molten softening state or molten state when the low-voltage arrester is in internal fault, and avoid the response hysteresis for separator action caused by the fault heat loss of the arrester. The method can be widely applied to the fields of design, manufacturing or operating maintenance of low-voltage arresters under working voltage below 1kV-0.5kV.
Description
technical field [0001] The invention belongs to the field of lightning arresters, in particular to a lightning arrester used for overvoltage protection of a low-voltage power system. Background technique [0002] Surge arrester is an electrical device used to protect electrical equipment from transient overvoltage (lightning strike, operation, steep wave) and quickly cut off power frequency continuous current. It is usually connected in parallel with the protected line or equipment. [0003] Its internal main components are non-linear resistors (such as zinc oxide resistors), which are in a high-resistance state under normal power frequency voltage due to their good non-linearity, and the arrester will not operate. When the overvoltage occurs, the action resistance sheet of the arrester is turned on, and the overvoltage shock current absorbs part of the energy through the resistance sheet and then leaks into the ground, thereby reducing the amplitude of the overvoltage, redu...
Claims
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IPC IPC(8): H01C7/12H01C17/00H01C17/02
CPCH01C7/126H01C17/00H01C17/02
Inventor 郭磊肖金星徐洁鸣俞强徐冰雁刘卫国骆国连刘杨名曹春徐建国房睿翟万利贲飞秦岭马福弟金鼎马春华
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO