1333 results about "Knife switch" patented technology

A utility tool comprising a body having a first end and a second end positioned on opposite ends of the body; a removable blade cartridge positioned within the body, wherein a knife blade within the removable blade cartridge is configured to slidably extend out from the first end; as well as a first tool and a second tool configured to be selectively coupled to each other or one of either the first end and second end of the body. The utility tool includes a knife switch coupled to the knife blade, the knife blade moves from the retracted position to the extended position only when the blade cartridge is engaged within the body. The utility tool having a spring mechanism for biasing the knife blade to the retracted position and a leaf member for engaging and disengaging the blade cartridge from the blade cartridge bay by a snap fit.

The invention relates to a direct current thawing apparatus with a special rectiformer and a protection method thereof. The direct current thawing apparatus with the special rectiformer comprises an alternating current side power supply circuit breaker QF, an isolating disconnect switch K, a rectiformer, valve side current transformers Ivya, Ivyb, Ivyc, Ivda, Ivdb and Ivdc, a current converter, direct current side voltage transformers Udp and Udn, direct current side current transformers Idp, Idn and Idgnd, and direct current side knife switches S1, S2, S3 and S4. The direct current thawing apparatus has the advantages of reasonable design, low investment and low cost. The protection method ensures the direct current thawing apparatus to satisfy the demand of safe and quick thawing in all circuits, and lowers the investment into the direct current thawing apparatus. The invention has the advantages of ingenious design, favorable performance, low investment, complete protection functions, convenience and high practicality.

The invention provides an intelligent terminal device adaptive to an intelligent transformer substation, belonging to the technical field of power automation. The intelligent terminal device adaptive to the intelligent transformer substation comprises a master control board, an open-in plate, an operating loop plate, an open-out plate, an interlocking plate, a simulating input plate, a display panel and a power source panel, wherein the master control board is used for realizing functions of logic judgment, external communication, I/O (input/output) control and the like of the device; the open-in plate is used for collecting and accessing the quantity of state of a switch; the open-out plate is used for driving a loop relay of the switch; the operating loop plate can be used for realizing functions of self-maintaining trip and close of a trip and close loop of a circuit breaker, monitoring the trip and close positions, pressure locking of trip and close and preventing tripping and the like; the interlocking plate can be used for locking the switch loop such as an earthing knife-switch and the like; the simulating input plate has a function of collecting information of a state sensor; the display panel is used for displaying the condition of the device and the state of the switch; and the power supply panel is used for providing a power supply for the device. With the adoption of the technical scheme provided by the invention, a structure of open-out-interlocking-operating loop is adopted for the operating control part of the switch, so that high infusion of the device with a primary device is realized, the reliability of the operating loop of the switch is enhanced, the CAN (controller area network) communication is reserved; and the intelligent terminal device has expandability.

The invention relates to the field of transformer maintenance safety, in particular to an anti-misoperation ground protection mechanism for a dry type transformer. The anti-misoperation ground protection mechanism for the dry type transformer comprises the transformer, a shell outside the transformer, a ground operation mechanism, a protection mechanism and a control mechanism; the ground operation mechanism comprises an operation connecting rod and a ground knife switch in the shell, an operation mechanism of the ground knife is connected with one end of the operation connecting rod, and the other end of the operation connecting rod penetrates out of an operation hole in the shell; the protection mechanism comprises a baffle and a first electromagnetic lock, the baffle is arranged on one side of the operation hole, and the first electromagnetic lock controls the baffle to shield the operation hole; the control mechanism comprises an electrified display arranged on the shell, the electrified display comprises three electrified sensors and a display body, the three electrified sensors are connected with wire inlet ends of a three-phase wire on a high-voltage side of the transformer respectively, and the display body is arranged outside the shell. The anti-misoperation ground protection mechanism for the dry type transformer has the advantages that during outage for maintenance, the ground knife switch can be operated outside the shell of the transformer to finish reliable grounding of the transformer, and accordingly personal safety of maintainers can be guaranteed.

The invention discloses a current ice-melting method for overhead ground wires of an electric transmission line. The method mainly includes following steps that by means of ground wire insulators, each of the overhead ground wires is down led in an insulation mode and grounded through grounding knife switches; the overhead ground wires are reliably grounded through the closed grounding knife switches when the electric transmission line is in normal operation; the grounding knife switches break, and the overhead ground wires are to ground insulation during ice melting; and a tail end of an overhead ground wire requiring ice melting is in short circuit with another nearby overhead ground wire or a shutdown transmission line, a starting end of the overhead ground wire requiring ice melting and the another nearby overhead ground wire or the shutdown transmission line are connected with an ice melting power supply to form an ice melting loop to start the ice melting power supply, and ice-melting currents are generated in the ice melting loop and used for working and heating to achieve ice melting. According to the current ice-melting method for the overhead ground wires of the electric transmission line, the ice-melting currents are loaded to the overhead ground wires to heat the overhead ground wires to rise temperatures so that covered ice on the overhead ground wires can be effectively melted.

The invention discloses an anti-misoperation method for a transformer station based image recognition, and the method is characterized in that an image collection unit obtains static and dynamic image information of transformer station equipment; an image processing unit converts the information into a logic criterion; the logic criterion is combined with electrical quantities which are obtained by all partitioned equipment measurement and control unit in a transformer station monitoring system and are used for reflecting the switching-on and switching-off positions of equipment, thereby forming double-locking criteria; the double-locking criteria jointly serve as the control conditions for sequential control or local control of switching operation, thereby achieving the image linkage of operated equipment (switches or knife switches) on an operating interface. The method is applied to an anti-misoperation method for the transformer station based image recognition, thereby preventing the single electrical logic locking from causing equipment misoperation and improper equipment operation because of a judgment error so as to avoid electrical misoperation, effectively improving the operation safety and reliability and switching operation efficiency of a transformer station, and providing powerful support for the safe and stable operation of a power grid.

The invention discloses an alternating-current low-voltage power distributing cabinet capable of being controlled remotely. The bottom of a cabinet body is provided with cushion blocks. The lower portion of the cabinet body is provided with cooling groove holes. The cabinet body is provided with a cabinet door. An instrument board is embedded into the upper portion of the cabinet body and provided with a display screen, instruments, a conversion switch and working indicating lamps. The top of the cabinet body is provided with a cooling fan, a sound-light alarm device and an anti-theft device. The cooling fan is provided with a dustproof ventilation screen. A bus bar, a combined bus-bar clamp, a breaker, a current transformer, an insulator, a knife switch, a temperature sensor and a humidity sensor are arranged in the cabinet body. The display screen, the sound-light alarm device, a wireless communication device, the temperature sensor and the humidity sensor are electrically connected with a control module. The alternating-current low-voltage power distributing cabinet capable of being controlled remotely is reasonable in structural design and wide in application range, and the power distributing cabinet damage prevention capacity and anti-theft capacity are improved effectively while stable operation of the power distributing cabinet is guaranteed.

The invention belongs to the technical field of electric systems, and relates to an intelligent device for simulating transformer substation primary equipment behavior. The intelligent device comprises an information processing module, a function switching module, a primary equipment interface module, an analogue simulation module and a test control switch. According to the intelligent device, the state of primary equipment can be simulated, and switching off and switching on of a breaker, operations of a disconnecting switch ( and an earthing knife-switch), analog control of transformer on-load voltage regulation and primary equipment state correctness testing can be finished in a secondary system integrator. The problem that a control loop of a traditional intelligent device needs to be tested on the spot is solved, and a necessary condition is created for achieving the testing of a secondary system plant preset mode.

The invention discloses a topological structure for a voltage source converter unit. The topological structure comprises a first unit isolated knife switch (D1), a unit isolated switch (S1), a voltage source converter, a second unit isolated knife switch (D2) and a connecting lead which are serially connected, a unit bypass knife switch (D3) and a unit bypass switch (S2), wherein the beginning end and the tail end of the series loop are used as a first direct-current endpoint (X1) and a second direct-current endpoint (X2) of the voltage source converter unit respectively; the unit bypass knife switch (D3) is connected between the first direct-current endpoint (X1) and the second direct-current endpoint (X2) in a crossed manner; and the unit bypass switch (S2) is connected between the end near the voltage source converter (Y1) of the first unit isolated knife switch (D1) and the end near the voltage source converter (Y2) of the second unit isolated knife switch (D2) in the crossed manner. The invention also discloses a control method corresponding to the topological structure. The topological structure and the control method realize online investment and quit of the single voltage source converter when two or more than two converters are in series operation in a direct-current transmission system.

The invention discloses a hybrid DC converter valve group online deblocking circuit which is used for the online deblocking of a voltage source converter. The circuit at least comprises a valve groupconnection line connection switch or knife switch of a voltage source type valve group unit, a DC link connection switch or knife switch of the voltage source type valve group unit and a bypass switchor knife switch of a current source type valve unit, or at least comprises a valve group connection line connection switch or knife switch of the voltage source type valve group unit, a neutral busbar connection switch or knife switch of the voltage source type valve group unit, a bypass switch or knife switch of the voltage source type valve unit and a bypass switch or knife switch of the current source type valve unit. The invention also discloses a hybrid DC converter valve group online deblocking method and device, firstly the voltage source converter is unlocked, the voltage source converter is connected to two ends of a grid commutating converter in parallel, the grid commutating converter is locked, the grid commutating converter is connected to the voltage source converter in series, and the online deblocking of the grid commutating converter is carried out.

The invention discloses a bolt with a looseness alarm function and belongs to the technical field of fasteners. The bolt with the looseness alarm function comprises an outer hexagonal bolt body, the outer hexagonal bolt body is provided with a threaded extension portion and a hexagonal head end portion which are sequentially arranged, the hexagonal head end portion is provided with hydraulic passages axially extending along the hexagonal head end portion, the hydraulic passages include the first hydraulic passage close to one side of the threaded extension portion and the second hydraulic passage distant from the side of the threaded extension portion, the second hydraulic passage is communicated with the first hydraulic passage, an end of the first hydraulic passage, on one side of the threaded extension portion, is provided with a first plunger, the first plunger extends out of the hexagonal head end portion, the second hydraulic passage is provided with a second plunger inside, and hydraulic oil is filled between the second plunger and the first plunger. The hexagonal head end, distant from one side of the threaded extension portion, is provided with an alarm circuit comprising a direct-current power source, an alarm lamp, a sound alarm and a knife switch, and the second plunger is connected with the knife switch. When the bolt is loosened, the alarm can be sent in time, and labor cost is reduced.

The invention discloses a knife switch closing reliability judging method based on the distance between a knife switch arm feature point and a fixing end, which is applied to knife switches rotating in vertical surfaces to be opened and closed and includes the following steps of: A, module information generating, B, preprocessing after real-time image collection, and C, opening and closing in place judging through comparison of elements with state not changing or changing a little during image collection. The knife switch closing reliability distinguishing method based on the distance betweenthe knife switch arm feature point and the fixing end effectively solves the problem of automatic judging of the knife switch closing reliability.

The invention discloses a starting control method for a static frequency converter (SFC) of a pump storage group. The circuit of the starting control method is simple, and thus the control flow is enabled to be simple, and a real-time tackling measure can be easily carried out when an accident occurs. The starting control method comprises a pump storage group, an LCU 5, the SPC, an excitation system and a monitor system. The pump storage group, the LCU5, the excitation system and the monitor system are electrically connected with the SPC. The pump storage group, the LCU5 and the excitation system are electrically connected with the monitoring system. The pump storage group is electrically connected with the LCU5. The monitor system sends an instruction of SFC starting preparation to the LCU5, and then the LCU5 and the SFC jointly complete preparatory work before the pump storage group is started by the SFC. The monitor system sends an instruction to the LCU5 for pulling open a dragged knife switch of the pump storage group. The monitor system sends an instruction of running in a wattles adjusting mode to the excitation system, and sends an instruction of pulling open a starting bus knife switch to the LCU5, and thus the whole process of starting the pump storage group by the SPC is completed. The invention is mainly applied to the technology of starting the pump storage group.

The invention provides a safety electric power knife switch, comprising a pedestal, a static contact seat, and a moving contact seat. The static contact seat is interlay provided with a circumferential insulation enclosed sildeway, the insulation side wall of which is provided with a static contact which is parallel to the insulation side wall; the static contact divides the insulation side wall into two segments; the moving contact is capable of moving relative to the pedestal; the moving contact can be inserted and pulled out in the slideway on the moving contact seat in the movable range; the outer surface of the moving contact is totally matched with the inner wall of the slideway; the front segment of the moving contact forms an insulation segment; the rear end of the front insulation segment is connected to a conductive segment; when the moving contact is moved to a switching on position, the conductive segment is totally matched with the static concat; and when the moving contact is moved to a switching on position, the conductive segment is totally disconnected from the static contact. The safety knife switch is not only easy in operation and high in safety, and can effectively prevent the production of the electric arc during the process of switching on and off.

The invention discloses a knife switch state closing reliability judging method based on the distance between knife switch arm feature points, which achieves accurate positioning of a contact area of a knife switch in an image in a feature point matching mode, achieves recognition positioning of circle feature areas respectively located on two knife switch arms in an image circle detection mode, calculating the diameter of a circle on any side and the distance of two circle area centers to calculate the proportionate relationship between the diameter and the distance so as to achieve knife switch state closing reliability judging. The knife switch state closing reliability judging method based on the distance between knife switch arm feature points has the advantages of achieving knife switch closing reliability judging based on the image pattern recognition technology, replacing operators to achieve knife switch closing in place reliability judging, greatly reducing labor intensity of the operators, shortening operation time, eliminating influence of subjective factors of onsite staff, and being small in working load and system cost and high in practicality.

The invention relates to a maintenance platform, which comprises insulation straight bars, a pedal bar, a work platform, platform supporting bars, a fixing frame and a locking component. The insulation straight bars have two, the pedal bar is riveted between the two insulation straight bars, inner lateral edges of the work platform are arranged on the middle portions of the insulation straight bars, lower portions of outer lateral edges of the work platform are supported through the platform supporting bars, the lower ends of the platform supporting bars are connected onto the fixing frame, the insulation straight bars are arranged on two sides of the fixing frame, and the lower portion of the fixing frame is fixed on channel steel of a knife switch through the locking component. The maintenance platform is skillful and reasonable in structure, operators work on the work platform, stability and safety are greatly increased, the upper portion of the work platform is equipped with a rotating fence which is combined and used with a safety belt so as to provide double protection for the operators, the fixing frame and the locking component can be freely slidably adjusted according to width of the field channel steel and are fast and convenient in mounting, and the fixing frame which is in columnar design is skillful in shape and can be suitable for different using occasions.

The invention discloses an online switch-off device and method for a hybrid direct-current transmission system converter. The method comprises the following content that a converter online switch-offcommand is initiated by a master control station, a thyristor converter of a rectifier converter station is controlled to increase a trigger angle, a thyristor bypass pair is switched off, a direct-current side parallel bypass switch is switched on, the thyristor converter is locked, and a bypass knife switch assembly is controlled to isolate the converter; and an inverter converter station is controlled to switch on a direct-current side parallel bypass circuit, a voltage source converter is locked, and the bypass knife switch assembly is controlled to isolate the converter. The difficult problem in online switch-off of the hybrid converter can be effectively solved; online safe switch-off of the VSC is realized; and the safety of the direct-current transmission system can be better protected.

The invention discloses a pi-type homologous nuclear phase system and method for a gas power plant. An excitation unit of a gas turbine generator is connected with a rotor of the gas turbine generator; the output end of the gas turbine generator is connected with the low-voltage side of a gas turbine main transformer through an outlet enclosed bus of the gas turbine generator and one synchronization point unit of the gas turbine generator sequentially; the high-voltage side of the gas turbine main transformer is connected with a high-voltage bus through two synchronization point units of the gas turbine generator; the high-voltage side of a steam turbine main transformer is connected with the high-voltage bus through a synchronization point unit of the steam turbine generator; and the low-pressure side of a steam turbine main transformer is connected with the output end of the steam turbine generator through an outlet enclosed bus of the steam turbine generator. According to the systemand the method, homologous nuclear phases of the plurality of synchronization points can be completed once; it is not required to change a running mode and operate a knife switch frequently; dangerous sources are relatively few; experiment time and fuel are saved; the experiment efficiency is relatively high; and asynchronous accidents caused by wiring errors can be effectively reduced.

The invention discloses a distribution network single-phase grounding fault simulation and positioning performance test platform and a method. One end of a first isolating knife switch is connected with a line, the other end of the first isolating knife switch is connected with one end of a first circuit breaker, the other end of the first circuit breaker is connected with one end of a graded and adjustable high-power resistor, the other end of the graded and adjustable high-power resistor is connected with one end of a second circuit breaker, and the other end of the second circuit breaker is grounded through an insulating conductor. One end of a second isolating knife switch is connected with the other end of the graded and adjustable high-power resistor, the other end of the second isolating knife switch is connected with one end of a gas discharge gap, and the other end of the gas discharge gap is grounded through the insulating conductor. One end of a third isolating knife switch is connected with the other end of the graded and adjustable high-power resistor, the other end of the third isolating knife switch is connected with one end of a controllable arc discharge device, and the other end of the controllable arc discharge device is grounded through the insulating conductor. By controlling the first circuit breaker, the second circuit breaker and the graded and adjustable resistor, simulation of line single-phase grounding is realized.

The invention discloses a transformer substation knife switch temperature detection method based on unmanned aerial vehicle dual-light image fusion, which comprises the steps of identifying a knife switch in a visible light image for one group of detection objects, and marking a local image of an area where each identified knife switch device is located by adopting an identification frame; recognizing the edge contour of the knife switch equipment in each local image, and obtaining the position information of each switch contact point in the visible light image according to the characteristicsof the edge contour of the knife switch equipment; calculating to obtain position information of each switch contact point in the infrared image by combining a mapping relationship between the visible light image and the infrared image in the same group of detection objects; and calculating to obtain temperature information of each switch contact point in the infrared image. According to the invention, the disconnecting link identification and temperature detection speed in the infrared picture is improved, the temperature detection result can be obtained more quickly, possible faults or abnormal conditions can be handled and dealt with more timely, and the overall detection efficiency of the temperature of the disconnecting link of the transformer substation is improved.

The invention relates to a method for repairing indoor bus knife switch moving contact of high tension bus without power failure. The technical proposal includes following steps: breaking high-voltage circuit-breaker to be repaired, pulling bus knife switch, checking whether the moving and static contact is cut off or not and without foreign body; assembling electrification repair dielectric isolation baffle based on pulling bus knife switch moving, static contact surrounding electric equipment condition, shouldering assembled electrification repair dielectric isolation baffle with the insulating rod to put and pull between the moving, static contacts of the bus knife switch, after completely effective separating the electrification part, performing repair of the bus knife switch moving, static contacts; after work to be repaired is completed, withdrawing the electrification repair dielectric isolation baffle with the insulating rod and restoring electric transmission. The invention has beneficial effects of reducing power failure scope, making time of bus power failure processing failure decline, ensuring power supply reliability, improving work efficiency greatly and realizing quick response and operation.