30 results about "Arc duration" patented technology

An apparatus and technique are provided for generating a plasma using a power supply circuit and arc detection arrangement. The power supply circuit has a cathode enclosed in a chamber, and is adapted to generate a power-related parameter. The arc detection arrangement is communicatively coupled to the power supply circuit and adapted to assess the severity of arcing in the chamber by comparing the power-related parameter to at least one threshold. According to various implementations, arc occurrences, arcing duration, intensity and/or energy are measured responsive to comparing the power-related parameter to the at least one threshold. According to further implementations, the above-mentioned measured quantities are accumulated and/or further processed. An apparatus and method are also provided for detecting arc events when the current spikes above a threshold level. The method and apparatus is also for classifying the arc events based on the voltage and current signals and the duration each is beyond a threshold value.

Disclosed is a vehicle which includes an electrical system monitoring system which results in detecting arcing in the electrical distribution system of the vehicle and the ability to provide notification and protection for such arcing. The system functions to monitor the electrical distribution system of the vehicle to sense the frequencies of signals in the system using appropriate filtering. One type of filtering which may be used is based upon a heterodyning circuit which provides variable frequency filtering for filtering a signal representative of the current in at least one electrical circuit of the vehicle. The heterodyning circuit output is configured to produce a signal which may be logarithmically related to the filtered signal. If the output signal exceeds a predetermined limit (representative of noise) for a predetermined period (representative of a typical arc duration), the system generates an arc signal. The arc signal may then be used to operate a circuit interrupter or an indicator in a circuit protection system or both.

The invention provides an arc welding method and an arc welding system. The arc welding method repeatedly includes unit welding periods of a droplet transfer period, an arc duration preparation period (T2) and an arc duration period (T3). In the droplet transfer period, welding currents are made to flow through in a method of determining a time average value of an absolute value to be a first value while a maximum value of the absolute value to be a second value between a consumption electrode and a base material, thereby making the droplet transferred to the base material from the consumption electrode. And in the period T2, the welding currents are made to flow through in a method that the maximum value of the absolute value is larger than the second value. And in the period T3, the welding currents are made to flow through in a method that the time average value of the absolute value is smaller than the first value, thereby generating arc duration between the consumption electrode and the base material. Thus, short circuit of the consumption electrode and base material in the arc duration period can be inhibited.

The invention discloses a cable initial-stage arc fault modeling method. Initial-stage arc faults are main manifestation forms of early degradation of cable insulation. The method comprises the following steps: for a widely used cross-linked polyethylene (XLPE) cable, measuring a typical characteristic curve of initial-stage arc fault voltage of a cable through a high-voltage experiment; analyzing and counting four key characteristic quantities including an arc starting time point, arc duration time, arc combustion duration voltage and insulation recovery overvoltage of the initial-stage arc fault, and fitting voltage characteristics of the initial-stage arc fault by adopting a CSC function; and finally, based on the fitted initial-stage arc fault voltage function, constructing a cable initial-stage arc fault model of the time-varying voltage-controlled nonlinear resistor, and giving model parameters. According to the method, the blank in the aspect of cable initial-stage arc fault modeling is filled, a model basis is provided for early warning, analysis and positioning of subsequent cable initial faults, and the method has important practical value.

The invention provides an ignition device for an engine. The device adopts a piston and a cylinder cover which are provided with needle electrodes at the same time, wherein two kinds of electrodes are correspondingly arranged, and ignition is carried out when the distance is shortest, and long arc duration ignition is maintained by utilizing high voltage arc ionized air in a process that the piston moves far away from the cylinder cover to ensure that combustible gas can be sufficiently burnt and achieve the effect of comprehensively improving the efficiency and emission of the engine. To ensure stable arc, the electrodes adopt a multi-needle structure.

The invention discloses an intelligent arc suppression and overvoltage protection system, which includes a power grid, an isolation switch module, a voltage mutual induction module, a control module, a vacuum circuit breaker module, a vacuum contact module, a voltage detection drive module, a control switch module, and a rectification and voltage stabilization module , infrared detection module and alarm module. Beneficial effects: the present invention can be used to detect the voltage of the power grid by setting the voltage detection drive module 7, and protect the power system from being burned by high voltage through the setting of the MOS tube. When a single-phase intermittent arc ground fault occurs, the control The device 4 sends an action command to the vacuum circuit breaker module 5 capable of single-phase operation, transforms the unstable arc grounding into a stable metal grounding, limits the overvoltage caused by the arcing grounding to the online voltage level, and greatly reduces the single-phase grounding arc. Time and the resulting insulation breakdown short circuit accident and arrester explosion accident.

The invention is suitable for the technical field of electronic engineering, and provides a gunfire simulator. The gunfire simulator comprises a firing electrode set, a discharging electrode set, a firing circuit and an energy storage circuit, wherein the firing electrode set is located on the inner side of the discharging electrode set, the height of the firing electrode set is lower than that of the discharging electrode set, and the firing circuit comprises a high-voltage generation circuit and an arc duration circuit; and a first connection point of the high-voltage generation circuit is connected with a positive electrode of the firing electrode set and a first connection point of the arc duration circuit, a second connection point of the high-voltage generation circuit is connected with a negative electrode of the firing electrode set and a second connection point of the arc duration circuit, a third connection point of the arc duration circuit is connected with a first connection point of the energy storage circuit, a fourth connection point of the arc duration circuit is connected with a second connection point of the energy storage circuit, a third connection point of the energy storage circuit is connected with a positive electrode of the discharging electrode set, and a fourth connection point of the energy storage circuit is connected with a negative electrode of the discharging electrode set. The gunfire simulator is small in size, light in weight and convenient to carry, and the problems that simulated gunfire in existing shooting training is low in sound level and distorted in sound quality are solved.

The invention belongs to the technical field of traction power supply system detection and monitoring and discloses a pantograph catenary arcing measurement sensor calibration device. The device comprises a measurement module and an arcing module, simulates actual data such as guide height and pull-out value through an adjusting structure, limits a working distance between a sensor to be calibrated and a light source for simulating arcing, three-way adjustment of the to-be-calibrated pantograph catenary arcing sensor is realized based on an adjustment platform structure, and different light source light transmission frequencies are adjusted through a rotating plate provided with light transmission holes, so pantograph catenary arcing duration, pantograph catenary arcing times and pantograph catenary arcing interval time measured by the pantograph catenary arcing sensor are calibrated in a mode closest to a use environment. The calibration device can calibrate multiple types of arcing sensors at the same time, and the influence of environmental interference light on the arcing sensors is considered at the same time. The invention further discloses a calibration method based on the calibration device for the pantograph catenary arcing measurement sensor.

The invention provides a welding control method, a welding machine control device and a welding machine. The welding control method comprises the steps that after a welding pulse is output, whether ashort circuit occurs in a current pulse period or not is detected; when the short circuit is detected, a short circuit duration and an arcing duration are obtained; a filtering voltage calculation method is determined according to the ratio of the short-circuit duration to the arcing duration; and the filtering voltage of the welding pulse is calculated in real time according to the calculation method, and when the filtering voltage reaches the preset voltage, next welding pulse is output. According to the embodiment of the invention, the problems of unstable arc and inconsistent arc length caused by short circuit in the welding process can be avoided.

The invention provides a thermal stability principle-based intermittent grounding protection method for a small-resistance grounding system and aims to solve the problem that the single arcing duration of an intermittent grounding fault is often smaller than a protection action time limit, and the problem that traditional grounding fault protection is difficult to process, and other problems,so as to effectively remove intermittent grounding faults. According to the technical schemes, zero-sequence current is used for constructing heating characteristic values of all outgoing lines in a fault arcing period, heat difference is used for constructing heat dissipation characteristic values after arc extinguishing, protection action is conducted after the heating characteristic values exceed the limit, and intermittent grounding faults are removed. The method provided by the invention can be used as backup protection for outgoing line protection of the existing small-resistance grounding system, and improve the operation and power supply reliability of the system.

The invention provides a quick arc-extinguishing device for extinguishing an arc of a high-voltage switch cabinet. The quick arc-extinguishing device structurally comprises a fixed contact 2, an arc-extinguishing chamber ceramic shell 3, a moving contact 4, a grounding contact 5, a watchband contact finger 6 and a miniature gas generator 7, wherein the fixed contact 2 is located at the upper part of the arc-extinguishing chamber ceramic shell 3; the grounding contact 5 is located at the lower part of the arc-extinguishing chamber ceramic shell 3 and is grounded; the watchband contact finger 6 is arranged in a groove of the moving contact 4; the moving contact 4 is arranged in a hole in the grounding contact 5; and the miniature gas generator 7 is arranged at the bottom part of the grounding touch 5. The quick arc-extinguishing device has the advantage that a main loop of the switch cabinet is grounded; and a switch cabinet protecting device sends out a circuit breaker breaking command of the cabinet, so that the switch cabinet is powered off. The time from the moment when an arc probe sends out a signal to the moment when an electronic detection device receives the signal is about 2ms; the time from the moment when the electronic detection device sends out the signal to the moment when the quick arc-extinguishing device extinguishes an arc light is about 2ms; and the condition that the arc duration is about 4ms is ensured, so that the arc energy is reduced and the safety of switch cabinet equipment is ensured.