65 results about "High voltage capacitors" patented technology

The invention discloses an electromagnetic ejection seismic source for seismic exploration in a well and an excitation method, which can continuously excite seismic waves, realize flexible output of seismic wave frequency and energy level, meet the requirement of shallow exploration for high-frequency signals in the well and adapt to the requirement of middle and deep layers for low-frequency signals. The seismic source comprises a control system, a shell and an electromagnetic ejection system, the control system is arranged at the top of the shell, the electromagnetic ejection system is arranged in the shell, the electromagnetic ejection system is connected with the control system, and the control system is used for controlling the electromagnetic ejection system, so that the electromagnetic ejection system hammers the well wall from the two sides of the shell at the same time, and the same seismic waves are generated on the well walls on the two sides of the shell at the same time; the excitation method comprises the steps of setting parameters, charging the high-voltage capacitor bank, charging the coil to enable the catapult to move in an accelerated mode, powering off the coil after the catapult reaches a balance position, enabling the hammer body to hammer a well wall when the catapult moves to a limit position, powering on the coil to enable the catapult to move reversely to enable the hammer body to return to an initial position after hammering delay time is reached, and the like.

The utility model belongs to the technical field of high-voltage test equipment, and particularly relates to a high-capacity high-voltage pulse direct-current generator, which comprises a power supply, the power supply is connected with the input side of a voltage regulator through a disconnecting link and a fuse, and the output side of the voltage regulator is connected with the low-voltage side of a boosting transformer. A live wire port of the high-voltage side of the boosting transformer is connected with an anode of the high-voltage rectification silicon stack, a cathode of the high-voltage rectification silicon stack is connected with an anode of the discharge gap ball, a cathode of the discharge gap ball is connected with an anode of a tested device, and a cathode of the tested device is connected with a null line port of the high-voltage side of the boosting transformer. A high-voltage capacitor is connected in parallel between the positive electrode of the discharge gap ball and the negative electrode of the tested equipment, and the high-capacity capacitor unit is formed by connecting two capacitors in parallel, so that compared with the direct purchase of a high-capacity capacitor, not only is the equipment cost reduced, but also the capacity of the capacitor is remarkably improved.

This invention belongs to the field of high-voltage capacitors and discloses a method and related apparatus for evaluating the dielectric loss of high-voltage capacitors. First, by collecting low-voltage dielectric loss data and corresponding rated high-voltage loss data of high-voltage capacitor samples at various voltages and frequencies, a mapping table from low-voltage to high-voltage loss is constructed. Iterative partitioning and optimization of the dividing points are then used to ensure mapping accuracy. This method learns the overall law of loss variation with voltage in a data-driven manner, thereby avoiding the deviation caused by the Garton effect in direct low-voltage measurements and avoiding errors caused by parameter sensitivity in traditional nonlinear fitting. Using this method, high-voltage dielectric loss can be conveniently evaluated in engineering sites using only low-voltage measurements, without the need for high-voltage experimental conditions and professional operators, significantly reducing measurement costs and complexity, while effectively improving the accuracy and engineering applicability of loss evaluation.

Sensored insulation plug for a medium voltage or high-voltage separable connector in a national grid, and operable to insulate a connection element of the separable connector on an elevated voltage and to simultaneously detect and sense the elevated voltage. The sensored insulation plug comprises a) a plug body formed by a solidified insulating material, b) an externally accessible detection contact, c) a primary capacitor, operable as a high-voltage capacitor in a sensing voltage divider for sensing the elevated voltage, the primary capacitor having i) a high-voltage electrode; ii) a sensing electrode embedded in the plug body; iii) a dielectric formed by a first portion of the insulating material, and d) a testpoint capacitor, operable as a high-voltage capacitor in a detection voltage divider for detecting the elevated voltage and comprising i) the high-voltage electrode, ii) a testpoint electrode, embedded in the plug body and electrically connected to the detection contact, and iii) a dielectric formed by a second portion of the insulating material.

The invention belongs to the technical field of fluid control, and discloses a high-speed electric control valve and a control method thereof, and the valve comprises a tubular valve body, an internal diaphragm, a metal explosion wire adhered to the diaphragm, a connecting electrode and a control circuit. The energy storage circuit module is composed of a high-voltage capacitor and a fast thyristor, when a trigger signal is received, the thyristor is conducted to enable the capacitor to instantly discharge to the explosion wire, the metal wire is gasified to generate shock waves to break down the diaphragm, and microsecond-level high-speed conduction is achieved. The diaphragm is preferably a polyimide film with the thickness of 10-100 microns, the explosion wire is a copper / tungsten wire with the diameter of 0.05-0.5 mm, and the explosion wire is matched with a capacitor with the charging voltage of 200-1000 V and the capacitance value of 10-1000 [mu] F. The control method comprises the steps of diaphragm installation, capacitor charging, triggering signal sending, high-voltage discharging and diaphragm breaking conduction, and reliable operation is ensured by dynamically adjusting charging voltage and adopting an optical fiber / wireless triggering mode. The invention has the characteristics of fast response and strong interference resistance, and is suitable for high pressure difference occasions needing to accurately control the on-off of gas.

The utility model relates to vehicle air conditioner compressor detection technical field, concretely relates to a kind of dynamometer function detection safety electrical connection mechanism:Including starting contactor, discharge contactor, high voltage capacitor, discharge resistance, LED pilot lamp, test start button and test stop button, starting contactor and high voltage capacitor are set in high voltage direct-current power supply and the high voltage direct-current bus of measured controller assembly, starting contactor controls power on-off, high voltage capacitor can inhibit the inrush current when contactor action, reduce the impact to measured controller assembly, avoid TVS tube burst, test stop, discharge contactor attraction, discharge through discharge resistance for high voltage capacitor, LED pilot lamp real-time display discharge state, guarantee the safety of operator, measured controller assembly is connected with measured permanent magnet synchronous motor, operating computer communication, ensure that test data accurate acquisition and analysis, improve the security and data accuracy of test process.

The utility model relates to the technical field of circuit breaker especially, a pole switch with image monitoring device, including high voltage capacitor electricity -taking power supply, camera device and 10KV high voltage circuit breaker, high voltage capacitor electricity -taking power supply and camera device are integrated in 10KV high voltage circuit breaker, and high voltage capacitor electricity -taking power supply obtains electric energy from high voltage line through 10KV high voltage circuit breaker, and high voltage capacitor electricity -taking power supply converts high voltage alternating current into low voltage direct current, and high voltage capacitor electricity -taking power supply powers camera device, and camera device is used for the monitoring of line, ground environment and forest fire prevention, and 10KV high voltage circuit breaker cuts off the line when detecting the fault. The utility model realizes real -time visual monitoring to high voltage line and its surrounding environment, can stably operate in the remote area without municipal power supply, solves the problem that traditional image acquisition equipment is difficult to deploy due to the lack of reliable power supply.

The utility model discloses peculiar smell treatment equipment for high-voltage capacitor production in the field of treatment equipment, which comprises a fixed box, a connecting frame is slidably inserted in the middle of the fixed box along the vertical direction, activated carbon is arranged on the inner side of the connecting frame and positioned above a bottom plate, and first porous screen plates are mounted in the middles of frame bodies on two sides of the connecting frame; a first fixed pipe communicated with the interior of the fixed box is installed in the middle of the surface of one side of the fixed box, and an induced draft fan is installed on the inner side of the first fixed pipe, so that in the using process, peculiar smell and harmful gas generated in the production of the high-voltage capacitor can be treated; according to the high-voltage capacitor production device, peculiar smell and harmful gas generated in high-voltage capacitor production can be conveniently extracted and filtered, harm to the body health of workers due to the peculiar smell and the harmful gas can be prevented, pollution to the surrounding environment due to the peculiar smell and the harmful gas can be avoided, and the living quality of surrounding residents can be guaranteed.

The application provides an earthquake-resistant high-voltage capacitor bank for extra-high voltage direct current transmission engineering, which comprises a high-voltage tower and a low-voltage tower, the high-voltage tower and the low-voltage tower comprise a plurality of capacitor frame layers, each capacitor frame layer comprises a frame and a plurality of capacitor units, the frame comprises six load-bearing channel steels and four vertical steel pipes, the frame has a rectangular frame structure, the load-bearing channel steels form the main body of the rectangular frame structure, the steel pipes are arranged at four corners of the rectangular frame structure, and the capacitor units are installed on the load-bearing channel steels, the capacitor frame layers are connected through interlayer composite support insulators, and the interlayer composite support insulators are connected with the steel pipes of the capacitor frame layers above and below. The application solves the problem that the high-voltage capacitor bank in the prior art cannot reach a high tower layer number and a high earthquake level acceleration on the basis of a double-tower.

The invention discloses a high-reliability small-size combined high-voltage capacitor convenient to assemble, and belongs to the technical field of high-voltage capacitor production, the high-reliability small-size combined high-voltage capacitor convenient to assemble comprises a shell and a plurality of capacitor cores arranged in the shell, the plurality of capacitor cores are sequentially arranged to form a capacitor core group, and in the capacitor core group, a plurality of capacitor cores are arranged in the shell. The first ends of all the capacitor cores and the second end of the first capacitor core are respectively provided with an extraction electrode, and after the extraction electrode at the second end of the first capacitor core is bent by 90 degrees, the end portion of the extraction electrode corresponds to the positions where the end portions of all the other extraction electrodes are located. The first end of the previous capacitor core is conductively connected with the second end of the next capacitor core through a conductive connecting sheet, an insulating isolation plate is arranged between two adjacent capacitor cores, and the conductive connecting sheet passes through a through groove or a through hole in the corresponding insulating isolation plate. The size of the whole capacitor is reduced, the assembling difficulty is reduced, the insulating property and the product reliability are improved, and application is convenient.

The utility model relates to the technical field of transformers, in particular to an indoor melting type special voltage transformer. According to the technical scheme, the device comprises a frame, and one side of the frame is fixedly provided with a grounding terminal; the oil tank is fixedly clamped between the frames, an intermediate transformer and a compensation reactor are fixedly mounted on the inner bottom surface of the oil tank, and a damper is arranged at the upper end of the compensation reactor; the liquid measuring assembly is arranged in the oil tank and is used for monitoring the insulating oil; the porcelain bushing is fixedly arranged on the upper surface of the oil tank, a high-voltage capacitor and a low-voltage capacitor are fixedly arranged in the porcelain bushing, the high-voltage capacitor is electrically connected with the low-voltage capacitor, a wiring terminal is fixedly arranged at the upper end of the porcelain bushing, and the wiring terminal is electrically connected with one end of the high-voltage capacitor. The liquid level of the insulating oil can be monitored in real time, liquid leakage is avoided, it is ensured that the voltage transformer is always in a good working state, equipment faults are reduced, and the reliability of a whole electric power system is improved.

The multilayer ceramic high-voltage capacitor comprises end electrodes and a ceramic body, the inner sides of the two end electrodes are attached to the left side and the right side of the ceramic body respectively, the inner wall of the ceramic body is connected with a capacitor structure, the outer walls of the end electrodes are connected with a reinforcing structure, and the bottoms of the outer sides of the two end electrodes are fixedly connected with bases respectively. A screw rod penetrates through two square plates from back to front, the rear portion of the outer wall of the screw rod is attached to the rear square plate, then a lantern ring is in threaded connection with the front portion of the outer wall of the screw rod till the rear portion of the outer wall of the lantern ring abuts against the front face of the front square plate, at the moment, tightening force towards the inner side is formed by the square plates, and then the square plates drive the square frame to retract towards the inner side. The pressing force is formed on the outer side of the joint of the square frame, so that the connection stability of the terminal electrode and the ceramic body is improved, the service life of the ceramic high-voltage capacitor is ensured, and the normal use of the ceramic high-voltage capacitor is ensured.

The application discloses a daisy chain communication structure and a communication method. The communication structure comprises a conversion module and a daisy chain. The conversion module is connected with an MCU. The daisy chain comprises a plurality of devices connected in sequence. The device arranged at one end is connected with the conversion module, and the device arranged at the other end is defined as a top device. DUART communication is adopted between every two adjacent devices. The MCU is used for receiving external instructions and transmitting the instructions to the conversion module. The daisy chain device of the application is provided with a built-in DUART communication interface protocol. Only two communication interfaces are needed at the top and bottom, half-duplex bidirectional setting and communication protocol support are realized, the top device is set to support bidirectional differential DUART, and the differential DUART in the voltage mode supports low-cost high-voltage capacitor isolation, improves communication efficiency, and makes power consumption more balanced.

The utility model discloses a circuit board circuit adjusting module, which comprises a circuit board, a wiring port, a radiating fin, an electric control silicon wafer, a clamping type radiating fin, a high-voltage capacitor, a fuse, an adjusting knob and a mistaken touch prevention locking block, the wiring port is arranged on the side end face of the circuit board, and the electric control silicon wafer, the high-voltage capacitor and the fuse are arranged in a circuit board body. The electronic control silicon wafer is installed in a clamping mode through the cooling fins and the clamping type cooling fins, the independent module of the adjusting knob and the circuit board are installed in a positioning mode, and the mistaken touch prevention locking block is fixedly installed on one side of the adjusting knob through a screw, and the circuit adjusting module of the circuit board is suitable for efficient cooling of electronic components and parts and mistaken touch prevention design of the adjusting knob. The electronic control silicon wafer is clamped and installed through the cooling fins and the clamping type cooling fins, the cooling silicone grease layer, the center heat conduction copper plate and the front cooling fins are matched with the cooling fins to achieve double-face efficient cooling, the tightening bolts are screwed to drive the clamping blocks to move after the adjusting knobs are adjusted, and the adjusting knobs are extruded and fixed through the anti-skid rubber cushion blocks to prevent the knobs from being touched by mistake.

The utility model provides a kind of 3VA ultra-low power consumption's primary and secondary depth fusion device, including primary switch and FTU controller, primary switch is built-in for the pole of capacitor power taking, and its power side and load side are connected with the output end of a pole respectively;Capacitor power taking module is arranged in pole, and capacitor power taking module includes capacitor voltage divider and electromagnetic unit, one end of the high voltage capacitor of capacitor voltage divider is connected with the high voltage terminal of primary switch, and the other end is connected with the low voltage terminal of primary switch by low voltage capacitor, and the medium voltage capacitor tap of high voltage capacitor and low voltage capacitor is connected with the input end of electromagnetic unit, and electromagnetic unit provides matching inductive compensation output standard 24V low-voltage alternating current.The utility model reaches the effect of easy installation and maintenance, efficient electric energy conversion, low-power operation and self-adapting power management by setting the pole of built-in capacitor power taking in primary side and the power management module of FTU controller.

A defibrillator of the present disclosure includes a H-bridge type biphasic pulse generation circuit connected to the rear stage side of a high-voltage capacitor. The biphasic pulse generation circuit includes a first switch, a second switch connected in parallel to the first switch, a third switch connected in series and to the rear stage side of the first switch, and a fourth switch connected in series and to the rear stage side of the second switch. The biphasic pulse generation circuit outputs a biphasic pulse from a first output line connected to a connection intermediate point between the first and third switches and from a second output line connected to a connection intermediate point between the second and fourth switches. In at least one of the first switch to the fourth switch, a plurality of thyristors are connected in series, and a resistor is connected in parallel to each thyristor.

A single-drive gate cascaded high-voltage MOSFET module circuit includes: a MOSFET, a static voltage equalization resistor, a high-voltage capacitor, a high-voltage avalanche diode, a transient voltage suppressor (TVS) diode, a drive resistor, and a varistor (MOV). The present invention has a simple drive structure and also has excellent switching characteristics, superior dynamic and static voltage equalization effects, and low module loss.

A gate driver circuit to receive an input drive signal and output an output drive signal is provided. The gate driver circuit may include a first capacitor having first and second terminals, a second capacitor having first and second terminals, a first set of switches to selectively couple the first terminals of the first and second capacitors to the input drive signal and a power supply voltage, a second set of switches to selectively couple the second terminals of the first and second capacitors to a reference voltage and a high impedance node, and a comparator having a first terminal coupled to the reference voltage and a second terminal coupled to the high impedance node. The comparator may output the output drive signal based on a comparison of the reference voltage and a voltage at the high impedance node.

The utility model relates to the technical field of electrode devices, in particular to a high-voltage capacitor extraction electrode device, which comprises two electrode plates, two electrode columns and a capacitor base body, the outer surfaces of the two electrode columns are fixedly connected to the interiors of one ends of the corresponding electrode plates, and the capacitor base body is fixedly connected to the outer surfaces of the two electrode columns. The outer surfaces of the other ends of the two electrode plates are fixedly connected to the upper side and the lower side of the capacitor base body respectively. The outer diameter of the two electrode plates is d1, the outer diameter of the capacitor base body is d2, and 2d1 is smaller than or equal to d2. The thickness of the electrode plate is 0.5 mm, when the material is thin, the distribution of electric field intensity and electric displacement is uniform, the electric field intensity and the electric displacement are not easily concentrated in a local area, the situation of uneven distribution of the electric field intensity is avoided, meanwhile, d1 is larger than or equal to 40mm and smaller than or equal to 60mm, the surface area of the electrode plate is increased, and the effect of improving the heat dissipation efficiency is facilitated.

The application discloses a calculation model of noise of a dry capacitor with a circular element structure at different temperatures and belongs to the technical field of dry high-voltage capacitor noise calculation. The calculation model comprises the following steps: S1, establishing a model of the influence of temperature on element and core noise; and S2, establishing a model of the influence of temperature on capacitor noise. The model of the influence of temperature on capacitor noise is further obtained by the model of the influence of temperature on element and core noise.

The utility model provides a kind of circuit board and radio frequency device, circuit board includes: board ontology is equipped with jumper area, first connection area and second connection area;Coupling line is set to board ontology, coupling line is equipped with multiple, multiple coupling lines are spaced distribution, and the one end of each coupling line is arranged in first connection area;Lightning protection wire is set to board ontology, one end of lightning protection wire is arranged in second connection area, lightning protection wire and coupling line are mutually isolated and mutually not intercommunicate;And, high voltage capacitor element is connected to lightning protection wire and located in second connection area, high voltage capacitor element is between lightning protection wire and coupling line, and high voltage capacitor element ground is set. Bypass ground high voltage capacitor influences high-frequency interference signal on nearby coupling line, reduces the signal interference between each coupling line, improves isolation index, to improve anti-interference ability, satisfy complex communication scene under high performance demand.

Sensored insulation plug (1) for being inserted into a separable connector in a power distribution network comprises a plug body (140) formed by a solidified insulating material (610), and a primary capacitor (150), operable as a high-voltage capacitor in a voltage divider for sensing the elevated voltage. The primary capacitor includes a high-voltage electrode (160) for direct electrical connection to the elevated voltage. A sensing electrode (170) of a tubular shape, embedded in the plug body (140), arranged around the high-voltage electrode, comprises a deformable mesh of conductive wires forming a plurality of apertures between the wires to allow portions of the insulating material (610) on opposite sides of the mesh to be mechanically connected with each other by insulating material in the apertures while the insulating material solidifies and thereafter. A dielectric formed by a portion (180) of the insulating material (610) is arranged between the sensing electrode (170) and the high-voltage electrode (160).

The utility model discloses a high-voltage-resistant capacitor testing device, which comprises a base, a plurality of lifting cylinders are arranged on the base, and a base plate is arranged at the end part of a piston rod of each lifting cylinder; stand columns are arranged at the four corners of the base, the same mounting plate is arranged at the tops of the stand columns, a partition plate is arranged at the center of the lower portion of the mounting plate and arranged in the length direction of the mounting plate, metal plates are arranged on the left side and the right side of the mounting plate, each metal plate is provided with a metal pressing plate in a matched mode, and the metal pressing plates are symmetrically arranged. A wire clamp fixing column and a plurality of connecting rods are arranged on the outer side of the metal pressing plate, the connecting rods penetrate through the mounting plate, a pushing cylinder is arranged on the mounting plate, the end of a piston rod of the pushing cylinder is fixedly connected with the connecting rods, and limiting grooves for the connecting rods to move are formed in the mounting plate. According to the utility model, a plurality of high-voltage capacitors can be tested at the same time, batch testing of the high-voltage capacitors is realized, and the detection efficiency is improved.

The utility model relates to the technical field of capacitor withstand voltage testing, in particular to a high-voltage capacitor withstand voltage testing conveying mechanism which comprises a base, a conveying belt is fixedly installed above the base and used for conveying capacitor cores, photoelectric sensors are fixedly installed at the two ends of the conveying belt, and an upper top plate is fixedly installed on the base through supporting columns. The upper top plate is provided with a lifting mechanism, the lifting mechanism comprises a servo motor fixedly installed on the upper top plate, an output shaft of the servo motor is connected with a worm through a transmission mechanism, the worm is meshed with a worm gear, and the interior of the worm gear is in threaded connection with a threaded rod; according to the utility model, the worm and worm gear system is driven by the servo motor, the flattening cylinder and the insulating pressure plate are accurately controlled to lift, the automation and accuracy of the capacitor core withstand voltage test are improved, meanwhile, the photoelectric sensor realizes accurate positioning and automatic conveying, the test efficiency is obviously improved, and the stability and reliability of the test process are ensured.

The application discloses a device and a method for removing elemental mercury by electric explosion of metal wires, which is composed of a wire supply mechanism, a wire clamping cylinder, a wire pulling cylinder, a positive high-voltage electrode, a negative high-voltage electrode, a reaction cavity, a high-voltage power supply, a high-voltage capacitor and a controller. The high-voltage power supply charges the high-voltage capacitor, the wire pulling cylinder pulls the metal wire from the wire supply mechanism into the reaction cavity, the wire clamping cylinder fixes the metal wire, the positive high-voltage electrode and the negative high-voltage electrode contact the metal wire, the high-voltage capacitor discharges the metal wire through the positive high-voltage electrode and the negative high-voltage electrode, high voltage and large current make the metal wire heat, melt, vaporize, explode and form iron vapor mist, the iron vapor mist condenses into nano-powder mist area of iron-based compounds such as nano-iron particles and nano-iron oxide particles in the waste gas, and the elemental mercury in the waste gas is removed after the iron-based compound nano-powder particles in the mist area fully contact with the elemental mercury.

The structure includes one or more capacitors formed in metal layers of a semiconductor die with the capacitors connected in series. The dielectric thickness of the capacitors is optimized to decrease parasitic capacitance and increase the breakdown voltage of the capacitor assembly.

The present application relates to the technical field of high-voltage measuring device of electric multiple unit power system, and particularly relates to a capacitive voltage transformer for electric multiple unit. The voltage transformer is formed into an integrated full-enclosed main insulator by epoxy resin vacuum casting, and the primary high-voltage terminal is a stepped round table type standard C head structure. The inside is composed of a high-voltage capacitor and a low-voltage capacitor to form a capacitive divider, cooperate with a reactor to realize impedance compensation, cooperate with a damper to suppress resonance and overvoltage, and set a protection gap to realize overvoltage protection, and all wiring terminals are arranged in a sealed secondary wiring table. The present application has the advantages of capacitive voltage division and electromagnetic measurement, has the characteristics of small size, flexible installation, anti-resonance, anti-interference, high precision, strong protection, maintenance-free, etc., can adapt to the compact space and harsh operating environment of electric multiple unit, and is suitable for high-voltage measurement and relay protection system of electric multiple unit.

1. Name of the product in this design: High-voltage capacitor switching switch. 2. Application of this design: This design is used for the frequent switching on and off of high-voltage active or reactive loads. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: 3D view 1.

The invention relates to the technical field of capacitor reliability evaluation, and discloses a metallized polyethylene film high-voltage capacitor storage reliability analysis method, which comprises the following steps: simulating different storage environments covering temperature, humidity and air pressure changes; periodically detecting a capacitance value, a dielectric loss value, an insulation resistance and a partial discharge amount; classifying detection data, drawing a change curve, calculating a change rate, associating environment analysis, forming a performance degradation rule, and judging whether the performance is degraded or not; and the reliability is evaluated by combining the environment and the degradation law, and the reliable storage duration in the set environment is determined. According to the method, the storage environment fits the actual working condition, the performance degradation can be accurately identified, the reliable storage duration can be quantified, and the use safety and usability of the capacitor after storage in the key field are guaranteed.

A sensored insulation plug for a medium-voltage or high-voltage separable connector in a power distribution network of a national grid, and operable to insulate a connection element of the separable connector on elevated voltage and to sense the elevated voltage. The sensored insulation plug has an outer shape generally symmetrical about a plug axis defining axial directions and radial directions, and comprises a plug body formed by an insulating material, and a primary capacitor, operable as a high-voltage capacitor in a voltage divider for sensing the elevated voltage. The primary capacitor has a high-voltage electrode for direct electrical connection to the elevated voltage, a sensing electrode of a tubular shape, embedded in the plug body, arranged around the high-voltage electrode and extending, in axial directions, between a first axial edge position (B) and a second axial edge position (A), and a dielectric formed by a portion of the insulating material arranged between at least a portion of the sensing electrode and at least a portion of the high-voltage electrode. A shield electrode of generally tubular shape, embedded in the plug body, is arranged around the sensing electrode and extending in axial directions at least between the first axial edge (B) position and the second axial edge position (A), and comprises a protruding portion extending in axial direction beyond the first axial edge position (B), such as to enhance electrical shielding, by the shield electrode, of the sensing electrode against external electrical fields.