Calculation model for metal oxide arrester in substation
A calculation model and lightning arrester technology, applied in the direction of instruments, measuring electricity, measuring electrical variables, etc., can solve the problem that parameters such as MOA resistor body capacitance and stray capacitance cannot be considered
Active Publication Date: 2017-01-04
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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[0006] In the embodiment of the present invention, a calculation model for metal oxide arresters in substations is provided to solve the problem that the calculation model of metal oxide arresters in the prior art cannot consider parameters such as MOA resistor body capacitance and stray capacitance.
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[0022] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described The embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.
[0023] see figure 1 , is a schematic circuit diagram of a calculation model for a metal oxide arrester in a substation provided by an embodiment of the present invention.
[0024] Such as figure 1 As shown, the calculation model for the metal oxide arrester in the substation provided by the embodiment of the present invention includes...
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The invention discloses a calculation model for a metal oxide arrester in a substation, which comprises a linear resistor, a bulk capacitor, a nonlinear resistor, a bulk inductor, a stray capacitor and an equivalent inductor, wherein the linear resistor and the bulk capacitor are serially connected to form a first serial branch; the nonlinear resistor and the bulk inductor are serially connected to form a second serial branch; the first serial branch and the second serial branch are parallelly connected to form a parallel circuit; a first loop after the parallel circuit and the equivalent inductor are serially connected is parallelly connected with the stray capacitor; one end of the stray capacitor is electrically connected with a voltage input end, and the other end is electrically connected with a ground end. Through decomposing the metal oxide arrester earth capacitor into the stray capacitor and a resistor disc bulk capacitor, the resistor disc bulk capacitor and the stray capacitor are equivalent respectively, the electrical characteristics of the metal oxide arrester in very fast transient overvoltage can be better simulated, and all parameters can be calculated.
Description
technical field [0001] The invention relates to the technical field of electric equipment detection, in particular to a calculation model for metal oxide arresters in substations. Background technique [0002] Since GIS (Gas-insulated metal-enclosed Switchgear, gas-insulated metal-enclosed switchgear) came out in the mid-1960s, due to its small footprint, little impact on the natural environment, safe and reliable operation, and long maintenance and repair cycles, etc. The advantages have been developed rapidly, and have been widely used in power systems at home and abroad. GIS in operation will face various overvoltage threats, especially VFTO (Very Fast Transient Overvoltage, very fast transient overvoltage). Close to 3.0p.u., the overvoltage rise time can be as fast as nanoseconds, which is extremely harmful to the safe operation of GIS and power systems. Therefore, the protection of VFTO in GIS is very important. [0003] MOA (Metal Oxide Arrester, Metal Oxide Arrester...
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IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 谭向宇王科马仪钱国超彭晶徐肖伟程志万彭兆裕刘红文杨明昆李昊郭晨鋆
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST