30 results about "Counterpoise" patented technology

The invention provides a diagnosis device for corrosion of an earth screen of a large-size transformer substation. The diagnosis device comprises a distribution type collection box, a signal collection device, a movable calculation PC (personal computer) and a 3G (3rd Generation) wireless communication terminal, wherein the distribution type collection box is formed by a box body, a protection cover, binding posts and a measuring lead wire, wherein the protection cover detachably covers the box body; a plurality of binding posts are vertical in a mutually-insulating manner and pass through a bottom plate of the box body; the measuring lead wire is a two-core flexible lead core; one end of the measuring lead wire is electrically with the lower ends of the binding posts; and the other end of the measuring lead wire is welded with a lead-up wire of a grid node of the earth screen. The diagnosis device and the diagnosis method for the corrosion of the earth screen of the large-size transformer substation can be widely applied to corrosion fault detection of the earth screen of the transformer substation which is put into operation and are particularly suitable for the large-size transformer substation which has a larger occupied area and higher safety requirements. Furthermore, the diagnosis device and the diagnosis method for the corrosion of the earth screen of the large-size transformer substation can also be widely applied to other systems with the earth screens, such as steel, chemical engineering, a power plant and the like and have extremely great required amount and an extremely wide application prospect.

The invention discloses a double-end grounding loop resistance and ground screen resistance measuring device and method.The device comprises a measuring device for outputting constant current to a measuring loop; the measuring loop comprises a measured branch, a grounding bar and a ground screen which are connected in series; the grounding bar is provided with a sampling clamp for measuring voltage signals of the grounding bar; and the output end of the sampling clamp is connected with the input end of the measuring device. According to the method, the sampling clamp and the measuring device are used for measuring the voltage of the grounding bar to obtain the shunt proportion according to the voltage proportion, and then the measured branch resistance is calculated. According to the invention, under the condition that the grounding wire is not dismounted, the actual current value flowing through each branch can be accurately measured, so that the loop resistance or the ground screen resistance of each branch can be accurately measured, and the detection accuracy and the working efficiency are improved.

The invention discloses an indoor ground screen reconstruction method for an S band continuous wave high-power microwave system. The method specifically includes the steps: determining pile burying positions according to indoor actual situations; drilling at the pile burying positions according to the size of piles; burying the piles; producing connectors of the piles and a ground screen; connecting the piles by the produced connectors, and deeply burying the piles and part of the connectors, wherein the piles and the connectors are in one to one correspondence; laying the ground screen according to requirements of the high-power microwave system; connecting the ground screen with the connectors exposed out of the ground; and connecting the ground screen with ground points of the microwave system. The method is applied to the discharge experiment of an EAST nuclear fusion device in spring in 2012, a grounding mode of a 2.45GHz / 4MW low-hybrid wave system is optimized, and damage of high impulse current to devices of the low-hybrid wave system is avoided during repeated klystron overcurrent.

The invention discloses a double-protection grounding wire method for a double-insulation catenary system for DC traction power supply, which includes a first protection grounding wire, laid through the line, connected to the station ground grid at both ends, and connected to each pillar respectively, as a catenary The short-circuit monitoring path when the broken wire overlaps the pillar; and the second protective grounding wire, which is laid through the line, connected to the ground network of the station at both ends, and connected to the insulating neutral section between the basic insulation and the auxiliary insulation on each pillar respectively The connection, insulated from the post, serves as a monitoring path for a flashover or failure of the basic insulation. The double protection grounding wire provided by the invention is laid through the line, and both ends are connected to the ground network of the station, which provides the monitoring of basic insulation flashover or damage and the short circuit monitoring path when the catenary breaks and overlaps the pillars, and at the same time meets the safety requirements. Under the premise of reliability, taking into account the coordination needs of urban landscape.

The invention discloses a secondary cable identification method based on an asymmetrical phase signal and relates to the field of cable identification. At present, there are behaviors of dismantling and dragging cables during the secondary cable inspection, which is prone to accidents. The present invention processes the induced current waveform, and obtains the signal source frequency and current amplitude, current cycle integral value, and current time integral value through FFT decomposition; if the signal source frequency current amplitude, current cycle integral value and If the difference between the corresponding information applied on the search cable is less than the set threshold, and the difference between the integrated value of the induced current and the corresponding information under the integral multiple of the signal cycle and the power frequency cycle is less than the set threshold, then the suspected cable is determined to be the cable to be found the opposite end. The technical solution can find the cable safely, quickly, effectively and at low cost, and can also accurately identify the starting end of the cable when the ground network connection is poor, saving personnel and time, and improving work efficiency.

A transmission tower and grounding grid concealed conduction detection device comprises a measurement host and an electric current test device, wherein the measurement host comprises a measurement host shell, the measurement host shell is provided with two signal output ends, a display screen, a storage battery, a running lamp and a power button, the inner part of the measurement host shell is provided with a main control processor, a display module, a signal injection module and a wireless communication module A, t he display module, the signal injection module and the wireless communication module A is connected with the main control processor respectively, the electric current test device comprises of a controller and a current sampling device, and the current sampling device comprises a flexible electric current coil, a sampling amplify module and a wireless communication module B which are successively connected. The system uses a flexible electric current coil measurement technology, and has the advantages of eliminating interference of an overhead ground wire to a measurement result and injecting into a signal directly through an instrument.

The invention discloses a dual antenna wireless communication device in a load control system. The wireless communication device for use in a load control system for controlling one or more electrical loads may comprise a counterpoise, a first and second antennas, a RF communication circuit and a control circuit. The two antennas may be oriented differently and spaced apart from each other. For example, the first antenna may extend perpendicularly from the counterpoise while the second antenna extends in a plane substantially parallel to the counterpoise. The first antenna may extend from the counterpoise at a point substantially central to the counterpoise while the second antenna may extend along a perimeter of the counterpoise. The RF communication circuit may transmit wireless signals via the first and second antennas. The control circuit may cause the RF communication circuit to transmit a first wireless signal in a first time slot and a second wireless signal in a second time slot.

The invention relates to an accelerator ground wire system based on EMC (Electro Magnetic Compatibility) and a design method, and the system comprises a universal ground net which is arranged at a universal equipment side and is a main grounding net of universal equipment, and the universal equipment is connected with the universal ground net through a low-voltage power distribution system of a power distribution room to realize safe grounding; the process ground net is laid nearby process power distribution equipment and is a main grounding net of the process power distribution equipment, the process equipment is connected with the process ground net through a grounding box, and differential grounding of the process ground net is achieved through the grounding box; and the grounding well is used for connecting the general ground screen and the process ground screen, realizing high-frequency isolation and power frequency combination between the general ground screen and the process ground screen, and serving as a grounding test point. The device can give consideration to safety protection and electromagnetic compatibility, and can be applied to the field of accelerator electromagnetic compatibility and grounding.

The invention discloses a radio frequency interface circuit, which includes a PCB board. On the top layer of the PCB board, from one end to the other end, there are sequentially provided a first pad, a second pad and a transmission line. The first pad plate and the second pad are respectively used for dragging the shielding ground net and the core wire of the tin welding shielded cable; the first impedance matching network for compensating the impedance is also provided on the PCB board, and the first impedance matching network includes matching stubs and Metallized vias, the matching stubs are set on the bottom of the PCB, and a second hollow area is set around the matching stubs, the metallized vias are set in the PCB board, and the two ends of the metallized vias are respectively connected to the second pad and the matching stubs . The invention can eliminate the inherent impedance discontinuity of the original radio frequency interface circuit and the difference of different frequency bands, reduce the high-frequency standing wave ratio and insertion loss, thereby realizing ultra-wideband impedance matching.

A craft type omnidirectional beacon reflective net on the roof and its construction method, the reflective net is arranged on the roof of the main structure, and also includes the steel frame of the reflective net and several roof columns, the roof column is arranged on the top of the main structure, It is fixedly connected with the main structure and the steel frame of the reflection net at the same time. The column on the roof is a reinforced concrete column, which is poured integrally with the load-bearing column of the main structure, and the embedded board is buried on the side. The buried plate is welded and fixed. The reflective net is installed directly on the roof without land approval, which effectively solves the technical problems of large floor area, high material consumption, and high cost of the ground net foundation point; the height is guaranteed, the signal error is small, and the result is accurate; the roof column cooperates with the reflective net The steel frame is fixed to effectively resist the top displacement caused by wind load and ensure the rigidity. The overall stability and strength are high, which can effectively reduce the vibration and swing of the top antenna and prevent signal instability; set up fiberglass guardrails and hollow pattern plates to ensure personnel safety Strengthen the signal reflection strength.

The invention relates to a wind profile radar seine and an installation method thereof. The wind profile radar seine comprises multiple seine floors, a foundation, an earth net, conduction members, aplurality of columns, first net pieces, second net pieces, and third net pieces. The seine floors are arranged at intervals and form a square. The foundation is fixedly arranged on the ground. One side of each seine floor is connected with a fixing member, each fixing member is fixedly arranged inside the foundation, the outer side of each fixing member is provided with a connecting member, and the connecting members enable the fixing members to be connected to form an integral body. The earth net is arranged underground, and is connected with the seine floors through the conduction members. The columns are correspondingly arranged on the seine floors in a vertical manner, and first and second net pieces are arranged between every two adjacent columns. The first net pieces, arranged in a vertical manner, are positioned at the lower ends of the columns. The second net pieces, positioned at the upper ends of the columns, are arranged in an inclined manner by facing the outer sides of thesquares. The second net pieces at four corners are connected through the third net pieces. The wind profile radar seine exhibits a better shielding property and reduces interference in radar antennasignals.

The invention relates to a lightning protection and grounding method for a shared iron tower. According to the mounting position of the 5G communication antenna, lightning protection protection methods are respectively proposed. Down conductor for lightning protection grounding; when the antenna is located in other locations (within the protection range of the lightning rod), the tower body is used as the grounding conductor; and the calculation formula of grounding resistance is optimized, taking into account the horizontal grounding body, vertical grounding body and radial grounding body Based on the existing grounding system of the power tower, a ground grid transformation plan is proposed, that is, a ring grounding device is added on the basis of the original ground grid, and the ring grounding device is on the same level as the original ground grid, and every 3‑5m Welded and connected to each other once, the ring grounding device includes a horizontal grounding body, a vertical grounding body and a radial grounding body, so that the grounding resistance of the shared iron tower can meet the requirements of the power system and the communication system at the same time.