摘要:
A voltage limiting composition, actually a nonlinear resistor, especially suitable for use in a gapless surge arrester is disclosed herein. This composition includes a predetermined amount of zinc oxide as its primary ingredient and one or more specifically selected additives. All of these constituents are combined and sintered so that the composition displays a nonlinear exponent .alpha. at least equal to about 35 over the current range of 1 ma to 5000 amps and such that its energy absorption capability is at least equal to about 50 joules/cm.sup.3.
摘要:
A sintered nonlinear resistor body, useful in gapless lightning arresters comprises a major amount of ZnO and additional metal oxides including at least Al.sub.2 O.sub.3 and an amount of boron oxide of from about 0.005 mole % to about 0.6 mole %, in combination with a total amount of at least one selected alkali metal oxide of from about 0.005 mole % to about 0.3 mole %.
摘要翻译:一种用于无间隙避雷器的烧结非线性电阻体包括主要量的ZnO和至少包括Al 2 O 3的另外的金属氧化物和约0.005摩尔%至约0.6摩尔%的氧化硼的量, 至少一种选自碱金属氧化物的约0.005摩尔%至约0.3摩尔%。
摘要:
A sintered nonlinear resistor body, useful in gapless lightning arresters comprises a major amount of ZnO and additional metal oxides including at least Al.sub.2 O.sub.3 and an amount of selected alkali metal oxide of from about 0.003 mole % to about 0.2 mole %.
摘要翻译:一种用于无间隙避雷器的烧结非线性电阻体包括主要量的ZnO和至少包含Al 2 O 3的额外的金属氧化物和约0.003摩尔%至约0.2摩尔%的所选择的碱金属氧化物的量。
摘要:
A sintered nonlinear resistor body, useful in gapless lightning arresters comprises a major amount of ZnO and additional metal oxides including at least Al.sub.2 O.sub.3 and an amount of boron oxide of from about 0.005 mole % to about 0.25 mole %.
摘要翻译:一种用于无缝隙避雷器的烧结非线性电阻体包括主要量的ZnO和至少包括Al 2 O 3的氧化物和氧化硼量为约0.005摩尔%至约0.25摩尔%的另外的金属氧化物。
摘要:
A gapless surge arrester is disclosed herein and includes a porcelain outer casing and a stack of zinc oxide discs located within the casing for passing surge currents therethrough. Silicon dioxide, preferably sand, is provided between this stack in the casing for transferring heat from the discs to the porcelain outer casing as a result of the surge current and for absorbing fault energy where necessary by changing states.
摘要:
A method for the nondestructive testing of voltage limiting blocks includes the steps of providing several discrete electrical contacts across the block, sequentially applying to each of the contacts a voltage to determine the corresponding current and utilizing the current and voltage values to determine constants related to the microstructure of that particular location. The constants can then be utilized to derive a contour map which will be indicative of a hot spot in such block as determined by a maxima of the contour map.
摘要:
A non-linear voltage limiting device displaying a particular stability characteristic and designed to eliminate flashover failure across its circumferential edge is disclosed herein along with a specific method of fabrication. The voltage limiting device is characterized by a rising resistive current with time at predetermined temperature and voltage levels and includes a disc-shaped wafer composed primarily of zinc oxide. In accordance with the method disclosed herein, after this wafer is formed and sintered in accordance with prescribed temperature and time requirements, its circumferential edge is provided with an anti-flashover coating which requires curing. Thereafter, the coated wafer is annealed in a way which cures the coating and, at the same time, reduces and preferably minimizes the resistive current rise characteristic referred to above.
摘要:
There is provided by this invention a current limiting fuse having a zinc oxide core electrically connected in parallel with an array of wire fuse elements capable of shaping and controlling the arc voltage developed during current interruptions.
摘要:
A fixture attached to the rear of the base plate of a semi-automatic screen printer includes an element holder having a vertical recess or pocket for receiving an assembly, such as a substrate, of LTCC laminate material lengthwise therein so as to expose only one side surface to the printing head which would otherwise be prevented because of the height restrictions imposed by the printer head.
摘要:
Slots or apertures are formed in the connector shroud of a T/R module in a plane perpendicular to the axis of the connector so as to allow plating solution to flow freely through the entire inner portion of the connector, particularly the rear portion, during fabrication of the T/R module. The slots are formed prior to the shroud being brazed on to the module substrate. By allowing plating solution to flow through the connector, the interior of the connector can be more thoroughly plated, thereby improving the yield of the assembly while reducing cost.