92results about How to "No power outage" patented technology

The invention provides a three-phase load imbalance automatic adjusting method of a power distribution network. A phase change switch module and a central control region module are arranged. The central control region module comprises a control module and a carrier wave module. The phase change switch module comprises an electric power electronic switch unit and a phase selection switch controller unit. The three-phase load imbalance automatic adjusting process comprises steps of acquiring three-phase current data into the central control region module; calculating imbalance degree; adopting the genetic algorithm during over-limit; coding a vector gene for a three-phase switch switching state corresponding to each load branch; obtaining an optimal phase change control instruction according to corresponding target function of the phase change module; transmitting the optimal phase change instruction to a phase selection switch controller unit of a phase change switch module on each load branch through the carrier wave module; and controlling the electric power electronic switch unit to finish the phase change operation. According to the invention, the method is used for supporting automatic detection during operation of an electric power system, so large quantity of manpower and materials are saved, device safety is improved and power supply reliability is improved.

The invention discloses a detection terminal for improving the efficiency of station area topology identification and the precision of line loss, comprising a management terminal, a topology identification terminal and a handheld PDA device, wherein, the topology identification terminal is used for acquiring electric energy and topology data of a branch access point and uploading the power and topology data to the management terminal; A handheld PDA device for transmitting binding information between the topology identification terminal and the branch access point to the management terminal; The management terminal is configured to draw a topology map according to the received power and topology data and the binding information between the topology identification terminal and the branch access point. The invention solves the problem of large fluctuation of line loss rate detection in the prior art, In order to improve the efficiency of topology identification and the precision of lineloss, the power frequency communication technology is used to measure, collect, store and transmit the topology information of low voltage distribution, which improves the high quality and high efficiency management of power supply enterprises to customers.

The invention discloses an electric appliance electrifying assembly. The electric appliance electrifying assembly comprises an inserting-connecting socket fixedly mounted in a wall body and an inserting-connecting plug connected with an electric appliance; inserting-connecting grooves are symmetrically formed in the inserting-connecting socket front and back; a telescopic groove is formed in the left end wall of the inserting-connecting socket; a power supply column is glidingly mounted in the telescopic groove; a first sliding groove which runs through the inserting-connecting groove is also formed in the inserting-connecting socket; a second sliding groove which extends up and down and is positioned in the left side of the first sliding groove is formed in the inserting-connecting socket; a first through groove is formed between the first sliding groove and the second sliding groove; a second through groove is formed between the second sliding groove and the inserting-connecting groove; a first sliding block which can slide up and down is mounted in the first sliding groove; a second sliding block which can slide up and down is mounted in the second sliding groove; racks are arranged on both of the inner side end planes of the first sliding block and the second sliding block respectively; a rotational gear is rotationally mounted in the first through groove, and the rotational gear extends into the first sliding groove and the second sliding groove to be connected with the racks in a matching manner; and a partition plate is glidingly mounted in the second through groove.

The invention discloses a high-safety electrical appliance electrifying assembly. The electrical appliance electrifying assembly comprises an inserting-connecting socket fixedly mounted in a wall body, and an inserting-connecting plug connected with an electrical appliance, wherein inserting-connecting grooves are formed in the inserting-connecting socket in front-back symmetry; a telescopic groove is formed in the left end wall of the inserting-connecting socket; a power supply column is glidingly mounted in the telescopic groove; a first sliding groove penetrating the inserting-connecting groove is also formed in the inserting-connecting socket; a second sliding groove which extends up and down and positioned on the left side of the first sliding groove is formed in the inserting-connecting socket; a first through groove is formed between the first sliding groove and the second sliding groove; a second through groove is formed between the second sliding groove and the inserting-connecting groove; a first sliding block which can slide up and down is mounted in the first sliding groove; a second sliding block which can slide up and down is mounted in the second sliding groove; racks are arranged on the inner side end surfaces of the first sliding block and the second sliding block separately; a rotational gear is rotatably mounted in the first through groove, and the rotationalgear extends into the first sliding groove and the second sliding groove to be connected with the racks in a matching manner; and a partition plate is slidably mounted in the second through groove.

The invention discloses an improved electric power safety power supply assembly. The improved electric power safety power supply assembly comprises an inserting-connecting base body and an inserting-connecting plug body; transverse sliding grooves which extend left and right are symmetrically formed in the inserting-connecting base body up and down; inserting-connecting grooves which have rightward openings and are symmetrical up and down are formed between the two transverse sliding grooves in the inserting-connecting base body; conductive sheets are fixedly mounted in the inserting-connecting grooves; longitudinal sliding grooves connected with the two transverse sliding grooves are also longitudinally formed in the inserting-connecting base body; transverse sliding arms which can slideleft and right are mounted in the transverse sliding grooves; a first rack is arranged on the end plane on the right side, towards the inserting-connecting groove, of each transverse sliding arm; a connecting arm which can slide left and right is mounted in each longitudinal sliding groove; the connecting arm is fixedly connected with the corresponding transverse sliding arm; a power supply blockis fixedly arranged in the central position of the right end plane of each connecting arm; a power supply groove matched with the power supply block is formed in the central position of the right endplane of each longitudinal sliding groove; and conductive inserting rods which are symmetrical up and down are arranged on the left end plane of the inserting-connecting plug body.

The invention discloses an electric power safety power supply assembly. The electric power safety power supply assembly comprises an inserting-connecting base body and an inserting-connecting plug body; transverse sliding grooves which extend left and right are symmetrically formed in the inserting-connecting base body up and down; inserting-connecting grooves, which have rightward openings and are symmetrical up and down, are formed, between the two transverse sliding grooves, in the inserting-connecting base body; conductive sheets are fixedly mounted in the inserting-connecting grooves; longitudinal sliding grooves connected with the two transverse sliding grooves are also longitudinally formed in the inserting-connecting base body; transverse sliding arms which can slide left and right are mounted in the transverse sliding grooves; a first rack is arranged on the end plane on the right side, towards the inserting-connecting groove, of each transverse sliding arm; a connecting arm which can slide left and right is mounted in each longitudinal sliding groove; the connecting arm is fixedly connected with the corresponding transverse sliding arm; a power supply block is fixedly arranged in the central position of the right end plane of each connecting arm; a power supply groove matched with the power supply block is formed in the central position of the right end plane of each longitudinal sliding groove; and conductive inserting rods which are symmetrical up and down are arranged on the left end plane of the inserting-connecting plug body.

The invention belongs to the field of power systems and discloses an artificial pollution accumulation characteristic testing system and an operating method thereof. The system comprises a wind source power section, a test section and an air duct diffusion and dust removal section which are communicated in sequence; the wind source power section is used for providing natural wind for the test section; the test section is used for simulating the pollution accumulation condition of an insulator of a power grid; the air duct diffusion and dust removal section is used for collecting dust and providing an air duct outlet; and the wind source powder section is provided with a base for supporting the testing system. The testing system is internally provided with a draught fan, a dust spreading device, the insulator and the like, so that the artificial simulation for the natural pollution accumulation conditions of the insulator in typical environments such as wind, rain, fog and the like and different pollution degrees in a laboratory is realized; compared with the traditional method for researching the natural pollution accumulation characteristic through circuit sampling, the operating method is time-saving and labor-saving, safe and reliable as well as wide in research range; and a research result has important significance for the operation maintenance as well as the design and selection of the insulator of a power transmission line.

The present invention provides an artificial contamination deposition characteristic test system, which comprises a wind source power segment, a test segment and a wind channel diffusion dust removing segment, wherein the wind source power segment, the test segment and the wind channel diffusion dust removing segment are sequentially communicated, the wind source power segment is provided for providing nature wind for the test segment, the test segment is provided for simulating a contamination deposition condition of insulators of a power grid, the wind channel diffusion dust removing segment is provided for collecting dust and providing a wind channel outlet, and the wind source power segment is provided with a base for supporting the test system. According to the present invention, the fan, the dust sprinkling device, the insulator and the like are arranged inside the test system, such that artificial simulation comprising nature contamination deposition on the insulator under typical environments such as wind, rain, fog and the like and under different contamination degrees can be performed in the laboratory, characteristics of time saving, labor saving, safety, reliability and wide research range are provided compared with the traditional nature contamination deposition characteristic research method adopting line sampling, and research results provide important significances for operation maintenance and design type selection of the transmission line insulator.

The invention relates to a main transformer gas relay online inspection device, the device comprises a main transformer body and an oil conservator arranged on the top of the main transformer body, the device also comprises a main transformer body connecting pipe, an oil inlet working solenoid valve, a first t-branch pipe, a second t-branch pipe, an oil outlet working solenoid valve and an oil conservator leading-down pipe which are connected in sequence, and the gas relay is arranged on the connecting portion of the first t-branch pipe and the second t-branch pipe; the device also comprises an oil inlet pipe, an oil storage tank, an oil outlet valve of the oil storage tank, an online inspection device for inspecting whether the gas relay is qualified and an oil outlet pipe which are connected in sequence, the other end of the oil inlet pipe is connected with the third end of the second t-branch pipe through an oil outlet inspection solenoid valve, and the other end of the oil outlet pipe is connected with the third end of the first t-branch pipe through an oil inlet inspection solenoid valve; and the invention also relates to a main transformer gas relay online inspection method. According to the invention, online inspection can be performed on the gas relay at any time in uninterruptible power supply online state.

The invention discloses an electric power secure power supply assembly. The electric power secure power supply assembly comprises an inserting-connecting base body and an inserting-connecting plug body; transverse sliding grooves which extend left and right are symmetrically formed in the inserting-connecting base body up and down; inserting-connecting grooves, which have rightward openings and are symmetrical up and down, are formed, between the two transverse sliding grooves, in the inserting-connecting base body; conductive sheets are fixedly mounted in the inserting-connecting grooves; longitudinal sliding grooves connected with the two transverse sliding grooves are also longitudinally formed in the inserting-connecting base body; transverse sliding arms which can slide left and rightare mounted in the transverse sliding grooves; a first rack is arranged on the end plane on the right side, towards the inserting-connecting groove, of each transverse sliding arm; a connecting arm which can slide left and right is mounted in each longitudinal sliding groove; the connecting arm is fixedly connected with the corresponding transverse sliding arm; a power supply block is fixedly arranged in the central position of the right end plane of each connecting arm; a power supply groove matched with the power supply block is formed in the central position of the right end plane of eachlongitudinal sliding groove; and conductive inserting rods which are symmetrical up and down are arranged on the left end plane of the inserting-connecting plug body.

The invention provides a capacitive current test method, device and system. The method comprises the steps that the primary side of an electromagnetic voltage transformer is electrically connected with the a-phase end, the b-phase end and the c-phase end of a switch cabinet live indication device; the high frequency voltage module of the capacitive current test device outputs the preset abnormal frequency current signal; the test module acquires the abnormal frequency voltage of the secondary side of the electromagnetic voltage transformer under the abnormal frequency current signal; and the total ground capacitance and the ground capacitive current of the isolated neutral system can be calculated according to the abnormal frequency voltage, the abnormal frequency current and the capacitance of the live indication sensor. The abnormal frequency signal is injected and measured by ingeniously using the open delta of the electromagnetic voltage transformer so as to have the characteristics of high safety, high anti-interference capacity and convenient measurement in comparison with the method of direct signal injection. The method is simple in test loop and high in safety without power outage so as to be suitable for the ungrounded system capacitive current test.

The invention discloses a hospital pan-and-tilt camera. The hospital pan-and-tilt camera comprises a base, the upper portion of the base is provided with a housing through a first sealing bearing, theinside of the housing is provided with a first motor and a second motor, the rotating shaft of the first motor is fixedly connected with the center of the upper portion of the base, the body end cover of the first motor is fixedly connected with the center of the top wall inside the housing, the second motor is fixedly mounted onto the inner top wall of the housing through a connecting base, therotating shaft of the second motor is fixedly connected to the center of one side of a driving belt pulley, the driving belt pulley is drivingly connected with a driven belt pulley through a belt, andthe center of one side of the driven belt pulley is fixedly connected with one end of a first connecting shaft. The hospital pan-and-tilt camera is large in adjusting angle range and capable of achieving panoramic monitoring, and meanwhile, is good in waterproof performance, applicable to remote monitoring and control and worth generalizing and popularizing.

The invention discloses a construction project environmental monitoring device which comprises a box body. A support plate is installed above the box body. The upper surface of a support seat is fixedly equipped with a pair of telescopic supporting columns, and the top ends of the telescopic supporting columns are provided with a fixed plate. A vertical column is fixedly installed on the fixed plate, left and right sides of the vertical column are equipped with high definition cameras through connection rods, and the connection rods are equipped with multiple lighting lamps. The top of the vertical column is provided with a control box, the left side of the control box is orderly provided with a temperature sensor and a PM2.5 sensor from top to bottom, and the right side of the control box is orderly provided with a noise sensor and a wind speed sensor from top to bottom. According to the device, the sensor technology is used to realize the collection of information, through respectively collecting dust concentration, temperature, wind speed, noise intensity and scene picture information and transmitting the collected information to a monitoring station computer through a wireless sensor, the monitoring station computer controls an alarm device to emit alarm according to the monitored data.

The invention provides a village supercharger, comprising a transformer device, an automatic control device and a selector switch device, wherein the automatic control device is connected to the selector switch device; the transformer device is connected to the selector switch device. The invention provides a village supercharger which uses a transformer for regulating voltage stepped at a low voltage side, and the fixed voltage mode is transformed into multilevel on-load voltage regulation mode; the structure is simple and the cost is reduced greatly.

The invention discloses a new energy vehicle charging pile device, which includes a charging pile, a charging port arranged in the right side end face of the charging pile, and a charging head connected with a new energy vehicle. The bottom of the charging pile is fixedly provided with a base. The top of the charging pile is fixedly provided with a rain shelter. A jack is arranged in the charging port in a front and back corresponding manner. A pushing groove is arranged in the left end wall of the charging port. A power distribution head is smoothly installed in the pushing groove. The charging port is provided with a first sliding slot penetrating the jack. The charging port is further provided internally with a second sliding slot which extends up and down and is located on the left side of the first sliding slot. A first through slot is disposed between the first sliding slot and the second sliding slot. A second through slot is disposed between the second sliding slot and the jack.

A self-climbing lifting apparatus for lifting up the iron tower of high-voltage transmission lines is composed of at least two lifting screw rod, the fixer on each lifting screw rod of fixing the gradually lifted supporting plate for said iron tower and the supporting base to the lifting screw rod, and jack on the supporting base for lifting said supporting plate. Its lifting method features that installing said apparatus to each leg of iron tower, and operating the jacks to lift up the iron tower gradually.

The invention provides a junction box with a load for replacing a metering device, and aims to solve the problem that power needs to be cut off when the metering device is replaced in the prior art. The junction box comprises a box body, a short-circuit plug, two live wire terminals and two null wire terminals; the live wire terminals are connected between a live wire and a corresponding live wire connector of the metering device, and the null wire terminals are connected between a null wire and a corresponding null wire connector of the metering device; the live wire terminals and the null wire terminals are arranged on the box body; and the box body is provided with a jack matched with the short-circuit plug, the two live wire terminals are turned on by the short-circuit plug, and the two null wire terminals are turned on by the short-circuit plug. The box body, the two live wire terminals and the two null wire terminals connect the live wire and the null wire with the metering device; when the short-circuit plug is plugged, the current of the live wire and the null wire passes through the short-circuit plug instead of the metering device, so when the metering device is replaced, a user does not need to cut off power; and more convenience is brought to power utilization of users.

The invention relates to a transmitter for testing radiation fan, which can test several fans at one time, wherein transmitter comprises a workbench, a transmitter, several movable carriers on the transmitter and the first and second tracks under each carrier; the transmitter comprises one transmitting element and one power element moving the transmitting element; each movable carrier comprises one support plate, one testing circuit on the support plate and two distanced first and second conductive plates on the bottom of support plate; the first and second tracks both have positioning plate and several micro tacks on the plates; with the tracks and the transmitting element, the radiation fan on the carrier can test and transmit synchronously.

The invention provides a method, a device and a system for testing the capacitive current. The method comprises the following steps: respectively and electrically connecting the test terminals m of the current output module of a capacitive current testing device with the a-phase terminal, the b-phase terminal and the c-phase terminal of a switch cabinet electrified indication device; electricallyconnecting the grounding terminal o of the current output module of the capacitive current testing device with the grounding terminal of the switch cabinet electrified indication device; controlling the high-frequency voltage module of the capacitive current testing device to output an abnormal-frequency current signal; acquiring the abnormal-frequency voltage of the current output module of the capacitive current testing device under the abnormal-frequency current; according to the abnormal-frequency current signal and the abnormal-frequency voltage of the current output module under the abnormal-frequency current, calculating to obtain the total ground capacitance of a neutral point ungrounded system; and calculating to obtain the ground capacitive current according to the total ground capacitance. According to the method, the test loop is simple. The ground capacitance of each phase of the power system, relative to the ground, can be calculated respectively. Meanwhile, the conditionof power outage is not required and the safety is high. The method can be used for testing the capacitive currents of ungrounded systems.

The invention discloses a safe power supply device for a power consuming apparatus. The safe power supply device comprises a plug socket fixedly mounted in a wall and a plug head connected with the power consuming apparatus via an electric wire, the plug socket is provided with a sliding chamber which opens to the right, a sliding block is mounted in the sliding chamber in a sliding way, plugging grooves which open to the right are symmetrically arranged in an upper part and a lower part of the sliding block, first elastic electric conduction sheets are mounted in the plugging grooves, a power supply block is fixedly arranged on a left end face of the sliding block, a power supply groove matched with the power supply block is arranged in a left end wall of the sliding chamber, telescoping grooves that extend up and down are symmetrically arranged in upper and lower end walls of the sliding chamber, and sliding arms are mounted in the telescoping grooves in a sliding manner; second elastic electric conduction sheets are fixedly mounted on end faces, positioned away from the sliding chamber, of the sliding arms; third elastic electric conduction sheets opposite to the second elastic electric conduction sheets are mounted in the telescoping grooves, electric conduction arms matched with the plugging grooves are symmetrically arranged on an upper part and a lower part of a left end of the plug head, a lengthwise groove of which an upper end and a lower end are communicated with each other is arranged in the plug head, and a horizontal groove which opens to the left and runs through the lengthwise groove is arranged in the plug head.

The invention discloses a voltage providing system for detecting the performance of electronic products on-line without turning off power. The system comprises a work installation board, an electricity conducting device of detecting work station, a voltage switching device, a voltage switching control module and a detecting voltage providing module. Wherein the back side of the work installation board is equipped with conducting bar for contacting with the electricity conducting device of detecting work station; the detecting voltage providing module is connected with the voltage switching device for selectively connecting with the electricity conducting device of detecting work station under the control of the voltage switching device; the voltage switching device is connected with the voltage switching control module. The system also comprises a normal voltage providing module which is connected with the voltage switching device for selectively connecting with he electricity conducting device of detecting work station under the control of the voltage switching device; the gaps between the electricity conducting device of detecting work station with the electricity conducting devices on its two adjacent work station is less the length of the conducting bar on the back side of the work installation board.

The invention discloses a high temperature rotor water cycle cooling device which is used for cooling an excitation rotor. The device comprises a stator and a rotor, the rotor comprises a rotor body, an extending section is arranged at one end of the rotor body, a water storage cavity is arranged on the extending section, a water pipe penetrates through the water storage cavity of the extending section from the position of a central axis line outside the stator and extends into the rotor body, a water inlet is arranged on the water pipe which is arranged on the outer side portion of the stator, a recycled water channel which is communicated with the water storage cavity and the water pipe is arranged in the rotor body, a water outlet hole of the water storage cavity is arranged on the side wall of the extending section, and a water outlet channel which is capable of discharging water in the water storage cavity to the outside of the stator is arranged at the position corresponding to the water outlet hole. By means of the structure, heat generated by high speed rotation of the rotor can be taken away through cooling water in the recycled water channel, the rotor is excellently cooled, the long-term usage of the rotor is facilitated, particularly the phenomenon of power failure in generating devices caused by the fact that the rotor is damaged by high temperature is prevented, and remarkable convenience is brought for users.

The invention discloses a waterproof and breathable underground cable capable of preventing mistaken digging and breaking. The waterproof and breathable underground cable comprises an outer pipe and an inner pipe, wherein the outer pipe sleeves the inner pipe, the outer pipe comprises a connecting end and a contact end, a clamping groove is formed in the contact end, the connecting end is connected with the front of the inner wall of the clamping groove through a rubber pipe, the connecting end is matched with the clamping groove, a first rubber plug and a second rubber plug are embedded in the connecting end and the contact end respectively in a penetrating mode, a puncture needle is arranged on the first rubber plug and the second rubber plug in one set in a penetrating mode, the puncture needle is connected with the output end of the draught fan, the inner pipe comprises a first air pipe, and a plurality of L-shaped connecting rods are fixedly arranged in the first air pipe. The waterproof and breathable underground cable has the beneficial effects that the length of the whole outer pipe is released, the flexibility of the cable is increased, the probability of being broken by digging is reduced, the opportunity of adjusting the digging angle is provided for related personnel, and the situation of power failure of corresponding electrical apparatus elements is avoided.

The invention relates to a diagnosis device for an insulation fault of a power distribution system. The diagnosis device comprises a current transformer, a partial discharge sensor, an infrared thermal imaging sensor, an ARM core processing unit and a man-machine interaction unit. Compared with the prior art, the diagnosis device has the advantages of high integration, multi-source research and judgment, comprehensive analysis based on ultrahigh frequency partial discharge, infrared temperature measurement and current break variable, and determination of the fault type, and is more accurate and efficient. Multiple sensors are fused and applied, the equipment cost is saved, and deployment is convenient. Non-contact installation is mainly adopted, live-line installation is achieved, and power failure is not needed. The diagnosis device has a plurality of network access modes, has a data aggregation function, can access a plurality of data sensing information through a plurality of wireless and wired communication modes, and performs data interaction with a superior system. According to a multi-parameter fusion analysis equipment state diagnosis and early warning technology, various monitoring data can be fused, fusion analysis is carried out, fault deduction is carried out by referring to historical data, and an operation and maintenance strategy is guided.

The invention discloses a nitrogen and phosphorus removal MBR integrated device using a submerged blower and sludge return. The device comprises an adjustment tank connected to a sewage pipe network,the adjustment tank is connected to a water inlet in an anoxic zone through a sewage lifting pump, sewage flows into an aerobic zone through a water outlet in the anoxic zone through an opening of thebottom of a partition plate, the sewage in the aerobic zone is pushed into a film zone through hydraulic power, a water outlet of the film zone is connected to a self-priming pump through a pipe, a water outlet of the self-priming pump is connected to a final discharge pipe through a pipe, the front end of the film zone is provided with a sludge return pump, the sludge is returned into the anoxiczone, the aerobic zone and the film zone are respectively connected to an air outlet of the submerged blower and are subjected to aeration, the submerged blower is installed on a damping cushion, anair inlet of the submerged blower passes through a filter screen and enters the blower, and air inlet and outlet pipes are provided with silencers and flexible connection members. The device has a reasonable structure, reduces film pollution, reduces backwash frequency and prolongs a service life of the film.

The invention provides a water-supply cable for a point welding machine. The technical scheme adopted by the water-supply cable is as follows: cabling conductors in pairs and isolating layers form a conductive cable core; a water channel sheath is arranged outside the cable wire; a heat-resistant insulating layer and a nylon silk screen wrap the exterior of the conductors; and a cooling water channel is arranged between the water channel sheath and the cable core. The water-supply cable can be used for overcoming the defects of a matched cable for a point welding machine in production of vehicle engineering and certain engineering products that the possibility of friction between two poles is high, the conductors emit heat, fracture of wire occurs, the water channel is blocked, and the conductors are dispersed because the compactness of conductor cabling twisting does not reach the requirement; and the water-supply cable is suitable for being used as a matched cable of a point welding machine for various special engineering test platforms and heavy-current equipment, such as the matched cable of point welding equipment used in various defense engineering equipment testing platforms, various automobiles, motor bicycles, tractors, household appliances, environment protection, machine manufacturing and special engineering, and is especially suitable for being used as a matched cable of DN3-series suspended movable point welding machines, DN2-series fixed point welding machines and defense engineering equipment.

The invention provides an intelligent vacuum storage tank. The intelligent vacuum storage tank comprises a tank body and a cover body, wherein the cover body covers the tank body in a combined mode. The intelligent vacuum storage tank is characterized in that an air release assembly, an air pumping assembly, a control assembly, a vacuum motor and a negative pressure detection switch are arranged in the cover body. The cover body is of a rotatable elastic press structure, and controls the air release assembly through rotating press. The control assembly is connected with the air release assembly through communication, one end of the vacuum motor is connected with the control assembly, and the other end of the vacuum motor is connected with the air pumping assembly through communication. Oneend of the negative pressure detection switch is connected with the tank body, and the other end of the negative pressure detection switch is connected with the control assembly through communication. The negative pressure detection switch is used for sending a detected negative pressure signal to the control assembly, the control assembly controls the vacuum motor according to the detected negative pressure signal, and therefore the vacuum motor controls the air pumping assembly to stop to conduct air pumping. According to the intelligent vacuum storage tank, an upper cover is rotated and pressed so that air pumping and air release of the vacuum storage tank can be directly controlled, and a user can conveniently operate the intelligent vacuum storage tank. In addition, the vacuum tank body comprises a recharging connector and can be connected with an external recharging device to conduct recharging operation at any time, and therefore the intelligent vacuum storage tank is conveniently carried outdoors.

The invention discloses a server power line fixing device, which comprises a fixing unit and is characterized in that the fixing unit comprises a fixing plate, an inserting head arranged at the upperside of the fixing plate and an adjusting tape arranged at the lower side of the fixing plate, and the inserting head is matched with a circular hole arranged in a case body. The adjusting tape is provided with a binding unit, wherein the binding unit comprises a moving plate arranged on the adjusting tape, the front side surface of the moving plate is fixedly provided with a binding tape, and theouter side surface of a suspended end of the binding tape is provided with second clamping teeth. The moving plate is provided with an inserting hole at the position corresponding to the suspended end of the binding tape. The server power line fixing device enables a power line to pass through the binding unit, and realizes fixed connection between the power line and the sever case body through fixing a power supply, thereby preventing the power line from falling off. The server power line fixing device is simple and easy to implement, convenient to install and low in cost.

The invention provides a capacitance current testing method, device and system. The method comprises the steps that a testing terminal of a voltage output module of the capacitance current testing device is electrically connected with an a phase terminal of an electrified indicating device of a switch cabinet, and an earth terminal of the voltage output module of the capacitance current testing device is electrically connected with an earth terminal of the electrified indicating device of the switch cabinet; a pilot frequency voltage signal is output; a testing module acquires a phase currentof the voltage output module; the testing terminal of the voltage output module of the capacitance current testing device is respectively and electrically connected with a b phase terminal and c phaseterminal of the electrified indicating device of the switch cabinet, and b phase current and c phase current of the voltage output module are respectively acquired; direct earth capacitance of each phase is calculated; and direct earth capacitance current is calculated according to the direct earth capacitance of each phase. The capacitance current testing method, device and system have the advantages that a test loop is simple, the direct earth capacitance of each phase of a power system can be respectively calculated, power failure is not needed, and the safety is high. The capacitance current testing method, device and system are applied to the capacitance current test of different earth-free systems.