33results about How to "Small transition resistance" patented technology

An electrical plug includes a housing and a spring clamp to connect a flexible electric conductor to an end piece of a rigid holder. The clamp spring includes a contact leg and a clamp leg. The clamp leg is bent closed in a loop onto the contact leg end providing a clamp opening through which the contact leg end protrudes. The clamp leg and a clamp opening edge positioned opposite to the clamp leg form a clamp location in which the electric conductor passed through the clamp opening is clamped before mounting the plug on the holder. After mounting, the holder extends through the clamp opening displacing the contact leg from the electric conductor. The holder and clamp spring clamp the electric conductor and form an electrical connection between the holder and electric conductor.

The invention discloses a method for protecting a double-end direct current distribution network. The method comprises the steps of: 1) performing regional division on the double-end direct current distribution network by using a direct current circuit breaker and a direct current bus; 2) when the direct current distribution network has a single-pole ground or double-pole short-circuit fault, judging the fault current direction in each divided region; 3) performing information interaction on the fault current direction in each region, thus distinguishing the fault type; and 4) removing the fault according to the fault type. The line of the direct current distribution network is short, and the information interaction is only performed in the adjacent regions, so that the influence of delay on data transmission can be ignored; only digital signals are transmitted, so that the transmission time can be nearly ignored; the current direction is changed on the millisecond level, and the fault is removed by using the solid direct current circuit breaker, so that the operation speed is high, and quick protection of the double-end direct current distribution network can be realized; and the scheme has certain transition resistance tolerance, and is thus universal for protection of double-end direct current distribution networks.

The invention discloses a lap-joint type copper-aluminum transition wire clip, which comprises an apparatus clamping part and a lead wire clamping part. The apparatus clamping part and the lead wire clamping part are transited through lap joint, and fixed by welding. The copper-aluminum transition wire clip provided by the invention has the characteristics of simple structure and convenient application. The lap-joint structure substitutes for the conventional butt-joint structure, which effectively increases a copper-aluminum transition area, reduces a transition resistance, and alleviates heat generating phenomenon. Meanwhile, the stress of the wire clip during application is changed, and the mechanical strength of the wire clip is improved. By the adoption of the advanced brazing technique, the welding quality is improved.

The invention discloses a method for manufacturing a steel-aluminum composite conductor rail, comprising the following steps of: a) preparing an aluminum rail: preparing an I-shaped aluminum rail by a mould through hot extrusion molding, wherein the two side surfaces of the upper end of the aluminum rail are provided with grooves; b) prefabricating a C-shaped stainless steel strip: cutting a stainless steel coil into stripy stainless steel strips, and cold bending and rolling by a cold bending unit to form a stainless steel strip with a C-shaped section, wherein the formed stainless steel strip comprises a base part, a first bending part, a second bending part and a clip part, the first bending part is formed by extending from the two sides of the base part and bending downwards, the second bending part is formed by extending from the first bending part and bending inwards, and the clip part is formed by extending from the second bending part; and c), compounding the C-shaped stainless steel strip and the aluminum rail, wherein the clip parts at two ends of the C-shaped stainless steel strip are embedded in the grooves on the two sides of the upper end of the aluminum rail, and the C-shaped stainless steel strip is completely attached to the upper part of the aluminum rail. According to the method in the invention, the stainless steel strip and the aluminum rail are closely combined, the combined surface is large, the transition resistance is small, deformation is not liable to occur after forming, a local heating mode is adopted during rolling compounding to facilitate forming, machining is not needed after rolling forming, and the production efficiency is greatly improved.

The invention relates to an RFID (Radio Frequency Identification Device) label of a silver paste antenna process and a chip packaging method, and an RFID label chip comprises a label base material, asilver paste antenna, glue and a chip, the packaging method comprises the following steps: printing a conductive silver paste antenna on a label substrate by using a printing unit; curing the silver paste antenna, so that the surface of the silver paste antenna is dry, and the interior of the silver paste antenna is in a wet film state; packaging a chip on the silver paste antenna; and integrallycuring the packaged silver paste antenna and the packaged chip. The RFID silver paste antenna packaging procedure can be optimized. Chip packaging is simpler, dependence on high-precision equipment isreduced, standardized and process production is achieved. Meanwhile, the packaging percent of pass is increased, cost and energy consumption are reduced. Optimization of the silver paste antenna printing process before packaging is driven, and the packaging capacity and the RFID label capacity are improved.

The invention relates to a calculation method of short-circuit current contributed by an alternating-current system during the direct-current fault of a multi-end alternating current / direct current hybrid distribution network. The method includes the following steps that: 101, a post-direct-current inter-pole short-circuit fault equivalent circuit of the alternating current / direct current hybrid distribution network is provided according to the characteristics of fault current and contribution made by the alternating-current system to the fault current after an inter-pole short-circuit fault of a direct-current line occurs, wherein the equivalent circuit is composed of an alternating-current voltage source 301, an alternating-current system equivalent resistor 302, an alternating-current system equivalent inductor 303, a converter station direct-current side capacitor 206, direct-current line resistors 304 and 306, and direct-current line inductors 305 and 307; 102, an analytical expression of the short-circuit current contributed by the alternating-current system is derived according to the analysis of the step 101; and 103, the calculation method of the short-circuit current contributed by the alternating-current system during the direct-current fault of the multi-end alternating current / direct current hybrid distribution network is provided according to the analysis of the step 102, the steady-state average value, transient peak value time and transient peak value of the method are calculated.

The invention relates to a contact-making and connection arrangement on the basis of film conductors introduced in a housing, wherein ends of the film conductors have a contact-making section and at least partly lie one above another. According to the invention, a double-sided self-adhesive or adhesive-coated conductive nonwoven material is situated between the contact-making sections facing one another, said material mechanically and electrically connecting the ends of the film conductors. Furthermore, the housing is embodied such that it is divided in the plane of the film conductors that have been introduced or are to be introduced, wherein the housing parts form half-shells and, in at least one half-shell, stamp-like projections are provided which lead to a deformation of the contact-making layer in such a way that a reduction of the electrical contact resistance of the connection occurs.

The invention discloses a method for manufacturing a steel-aluminum composite conductor rail, comprising the following steps of: a) preparing an aluminum rail: preparing an I-shaped aluminum rail by a mould through hot extrusion molding, wherein the two side surfaces of the upper end of the aluminum rail are provided with grooves; b) prefabricating a C-shaped stainless steel strip: cutting a stainless steel coil into stripy stainless steel strips, and cold bending and rolling by a cold bending unit to form a stainless steel strip with a C-shaped section, wherein the formed stainless steel strip comprises a base part, a first bending part, a second bending part and a clip part, the first bending part is formed by extending from the two sides of the base part and bending downwards, the second bending part is formed by extending from the first bending part and bending inwards, and the clip part is formed by extending from the second bending part; and c), compounding the C-shaped stainless steel strip and the aluminum rail, wherein the clip parts at two ends of the C-shaped stainless steel strip are embedded in the grooves on the two sides of the upper end of the aluminum rail, and the C-shaped stainless steel strip is completely attached to the upper part of the aluminum rail. According to the method in the invention, the stainless steel strip and the aluminum rail are closely combined, the combined surface is large, the transition resistance is small, deformation is not liable to occur after forming, a local heating mode is adopted during rolling compounding to facilitate forming, machining is not needed after rolling forming, and the production efficiency is greatly improved.

The system (10) has input device (20) comprising input terminal (32) and ground terminal (34). An input circuit (70) is connected between input terminal and ground terminal for detecting an input signal. A sensor device (100) is connected to input terminal, and is optionally connected to ground terminal. A supply voltage source (40) is provided for supplying the sensor device with energy. A switched current increasing unit (80) is connected to input terminal and ground terminal, to supply high current to input circuit as a function of applied voltage for adjustable time period.

The invention relates to an electromechanical protection switch (100) with: - at least one main contact pair (1, 1'), wherein one main contact (1) is arranged on a main contact bridge (2) , - at least one pair of secondary contacts (4, 4') with a higher melting point material than the primary contact (1), wherein one secondary contact (4) is arranged in a On the secondary contact bridges (5) connected in parallel with the contact bridges (2), - the first armature (10) for the movement of the main contact bridge (2), - the second armature (for the movement of the secondary contact bridge (5) 15), wherein the armature (10, 15) is formed such that the pair of secondary contacts (4, 4') opens after the pair of primary contacts (1, 1') and before the pair of primary contacts (1, 1') closure.

The invention discloses a fast line selection method for a single-phase grounding fault in a small current grounding system. First, the instantaneous value of the three-phase current at the outlet of each feeder line in the substation is collected in real time; secondly, according to the instantaneous value of the current, the instantaneous value of the zero-sequence current of the line is calculated, and the second-order derivative of the instantaneous value of each zero-sequence current is obtained by interpolation method; then, Taking the fault occurrence time as the zero time, find out the maximum value and minimum point of the second order derivative of the zero-sequence current instantaneous value of each line within 3ms; finally, find out the characteristic quantity of the zero-sequence current change trend of each line, and find out the maximum characteristic quantity , that is, it is judged that the line is a faulty line. The method of the invention is less affected by line length, transition resistance and arc suppressing coil, and can quickly select a single-phase grounding fault line.

The invention relates to the monitoring of support mechanisms in elevator installations. Specifically, it relates to a bearing mechanism for elevator equipment, which includes a plurality of tension carriers and coverings arranged in parallel to each other. In this case, the tension carrier is surrounded by the sheath, wherein the tension carrier extends along the longitudinal axis of the supporting means. The tension carrier is at least partially exposed from the casing over a section of the longitudinal axis of the carrier. On said section, contact elements for electrical contacting of the tension carrier are permanently fastened to the tension carrier. Furthermore, it relates to an elevator installation, a method for monitoring the state of a tensioned carrier in a support mechanism, and a plug for electrical sampling of the support mechanism.