2158 results about "Fuse cutout" patented technology

The invention discloses a new energy automobile fuse life expectancy prediction system based on current sensing, and belongs to the technical field of power transmission and distribution monitoring. In order to solve the problems that life early warning of a dynamic adjustment mechanism is lacked and variable factors in a complex working environment cannot be handled, the system can recognize different load modes by accurately collecting current, temperature and vibration data related to a fuse and combining multi-dimensional factors such as temperature and vibration, and the service life of the fuse is accurately adjusted. The performance of the fuse under various working conditions is comprehensively evaluated, thermal load and loss conditions of the fuse can be estimated by combining a loss model and temperature influence calculation, the accuracy of life prediction is improved, an early warning threshold value is adjusted in real time through a dynamic threshold value adjusting mechanism, and the service life of the fuse can be predicted by dynamically adjusting residual life threshold values at different stages. According to the utility model, the health state of the fuse can be accurately grasped, the maintenance and replacement time can be reasonably adjusted, unnecessary shutdown or delay can be avoided, the fault risk can be effectively reduced, and the safety and reliability of a new energy automobile system can be enhanced.

The invention relates to the technical field of fuses, and discloses a novel high-voltage fuse, which comprises a fuse mechanism and a control module, and is characterized in that the control module is electrically connected with the fuse mechanism; the fuse mechanism comprises a contact part, an exhaust contact seat part, an insulator, a fuse carrying part and a fiber grating sensor, the lower part of the insulator and the lower part of the fuse carrying part are connected through the exhaust contact seat part, the fiber grating sensor is located in the fuse carrying part, and the upper part of the insulator and the upper part of the fuse carrying part are connected through the contact part. According to the invention, the sensing precision of the operation state of the fuse is improved.

The invention provides an active and passive integrated protection intelligent fuse with a single excitation source. The active and passive integrated protection intelligent fuse comprises a first conducting bar, a signal melt, a second conducting bar, a circuit board and an excitation source, the circuit board is provided with the relay and the excitation source. The relay is connected with an external control unit, the excitation source, the first conducting bar and the second conducting bar. The first conducting bar, the signal melt and the second conducting bar are connected in sequence; an isolating layer is arranged on the relay, and the isolating layer is used for shielding crosstalk of external voltage on the relay; after a plurality of pins of the relay are welded on the circuit board, an insulation processing mode is adopted among the plurality of pins; and in an inspection working condition, the external control unit outputs a first inspection signal to the relay so as to control the relay to be switched into an inspection state, and feeds back the working state of the excitation source to the external control unit.

The invention relates to the technical field of state monitoring, in particular to an intelligent fuse comprising a monitoring module, and the fuse comprises a data analysis module, a steady state recognition module, a temperature analysis module, a coupling calculation module and a state calibration module. According to the method, time consistency verification and corresponding matching are carried out on temperature and current sampling, abnormal interference is eliminated in a stable current-carrying interval, a continuous sequence is formed, and a definite time relation is established between thermal response and a current-carrying state by combining analysis of accumulated deviation and change turning of the temperature along with time; the abnormal trend of slow evolution is amplified and presented, correction is carried out according to the direction consistency of multi-segment time difference change, progressive features before fusing are recognized in advance, early warning continuity and operation decision reliability are improved, misjudgment is reduced, continuous updating of state evaluation is supported, and stability of a control closed loop is improved.

A fuse group assembly may include a first bus bar, a second bus bar in a stepped arrangement with the first bus bar, a first support plate arranged on the second bus bar, a second support plate in a stepped arrangement with the first support plate, a first fuse having a first end electrically connected to the first bus bar and a second end supported by the first support plate, and a second fuse having a first end electrically connected to the second bus bar and a second end supported by the second support plate.

The invention provides an arc resistance characteristic-based segmented modeling method of a fuse for a direct current networking system, and relates to the technical field of common direct current bus system design, and the method comprises the steps: calculating the real-time arc resistance data of the fuse according to the continuously collected short-circuit voltage and short-circuit current at the two sides of the fuse in a short-circuit test process, and forming an arc resistance curve; intercepting an arc resistance curve from the peak moment of the short-circuit current to the slope descending moment of the arc resistance curve to obtain an arc starting stage arc resistance curve, and intercepting an arc resistance curve from the slope descending moment to the moment when the short-circuit current is zero to obtain an arc burning stage arc resistance curve; respectively carrying out data fitting according to the arc starting stage arc resistance curve and the arcing stage arc resistance curve to obtain a sectional arc resistance curve equation; and taking the arc resistance curve equation as a control signal to build and obtain a fuse simulation model based on the controlled resistor. The method has the advantages that the arc resistance curve is divided into two sections, the corresponding arc resistance curve equation is designed, the simulation precision is higher, and the method can be better suitable for different working conditions.

The invention relates to the technical field of power system monitoring and fault diagnosis. The invention provides an overhead line drop-out fuse monitoring method, system and device and a storage medium, and the method comprises the steps: obtaining the temperature data of a drop-out fuse, the current data of a line where the drop-out fuse is located, and the surrounding environment parameter data of the position where the drop-out fuse is located, and obtaining an initial data set; preprocessing the initial data set, and extracting key features to obtain a feature data set; based on the feature data set, constructing a temperature-current-environment coupling model, performing multi-dimensional correlation analysis on the feature data set, and dynamically calculating a real-time operation risk index of the drop-out fuse; and if the real-time operation risk index exceeds a preset threshold value, triggering a grading early warning mechanism, and synchronously generating a diagnosis report containing an abnormal parameter, position information and a timestamp. The problem that in the prior art, a traditional manual inspection mode is difficult to meet the requirement for monitoring the temperature of the overhead line drop-out fuse terminal in real time is solved.

The invention specifically relates to a standardized fuse fault monitoring and diagnosis system, and relates to the technical field of power system protection equipment monitoring. A signal processing and impedance spectrum calculation module; an intelligent diagnosis and state evaluation module; and a benchmark management and personalized tracking module. According to the invention, controllable micro test signals are actively injected to obtain frequency domain impedance fingerprints, and accurate capture of microscopic degradation is realized; non-intrusive coupling and signal injection are adopted, the topology of a main loop does not need to be changed, the inherent protection characteristic of the fuse is guaranteed, and power frequency interference can be penetrated; the recognition amount of budding faults such as contact oxidation and melt corrosion is improved in advance, and power failure accidents caused by fault expansion are avoided.

The invention provides an intelligent fuse, and belongs to the technical field of circuit protection, and the intelligent fuse is characterized in that an upper housing is provided with at least one excitation chamber, the excitation chamber is internally provided with at least one excitation part and at least one impact part, and the excitation part releases high-pressure gas when receiving any one of an external trigger signal and an internal trigger signal; the lower shell is provided with at least one cooling cavity; the current-conducting plate is arranged between the upper shell and the lower shell, and the impact part moves towards the direction where the cooling cavity is located under the thrust action of the high-pressure gas so as to cut off the current-conducting plate; the self-control module is arranged outside the shell and comprises a current detection unit and a processing unit, and the current detection unit is used for detecting a current signal on the conductive plate; the processing unit is used for generating an internal trigger signal according to the current signal. The beneficial effects of the invention are that a dual-trigger mechanism and redundancy design of an internal trigger signal and an external trigger signal are adopted, so that normal action can still be ensured when any signal fails, and the breaking reliability is improved.

The utility model discloses an electronic protection device and a power utilization device, and belongs to the field of fuses. The electronic protection device comprises a conductive element used for being connected to a circuit to be tested; the first excitation fuse and the second excitation fuse are connected in series on the conductive element; the arc extinguishing fuse is connected with the second excitation fuse in parallel; and the controller is used for detecting the value of a current flowing through the conductive element of a circuit to be detected, and is in communication connection with the first excitation fuse and the second excitation fuse. The first excitation fuse and the second excitation fuse are connected in series, the arc extinguishing fuse and the second excitation fuse are connected in parallel, and the controller outputs a trigger signal according to the detected current, so that the electronic protection device switches the first working mode or the second working mode, and the circuit can be protected when the circuit is overloaded or short-circuited.

The invention provides a control method of an intelligent fuse for DC cabinet protection and a related device. The method comprises the following steps: acquiring first current data and a first environment parameter set of a photovoltaic module in a preset first time period; determining a first protection threshold according to the first current data; acquiring second current data and a second environment parameter set of the photovoltaic module in a preset second time period; adjusting the first protection threshold according to the first environment parameter set and the second environment parameter set to obtain a second protection threshold; acquiring reference temperature data of the DC cabinet in a preset second time period; adjusting the second protection threshold according to the reference temperature data to obtain a third protection threshold; determining a current state according to the second current data and a third protection threshold value; and the intelligent fuse is controlled to perform circuit breaking processing according to the current state so as to ensure the operation safety of the DC cabinet. By dynamically and accurately adjusting the protection threshold, the safety of the DC cabinet can be improved.

The invention discloses a full-range drop-out fuse which comprises a base, the upper end and the lower end of the base are fixedly connected with an upper contact seat and a lower contact seat respectively, and a fuse carrier is installed between the upper contact seat and the lower contact seat. The fuse carrier is of a split type and comprises a current limiting part and a spraying part which are connected with each other in a detachable mode, and a first fuse wire in the current limiting part and a second fuse wire in the spraying part are connected between the upper contact seat and the lower contact seat in series. The fuse carrier comprises a current limiting part and an injection part which are connected in series, and has the advantages that a current limiting type fuse limits peak current under large fault current and does not inject combustible materials, and an injection type fuse is reliably switched on and off under the condition of small fault current, so that full-range fault current protection is realized; and meanwhile, the system has the advantages of good compatibility, low improvement cost and the like.

The utility model relates to an intelligent excitation fuse (100). The intelligent excitation fuse (100) comprises a partially hollow insulating shell; at least one copper bar (106) in which a plurality of fractures (106A) are laid; a plurality of breaking devices (200); the control circuit board (300) is used for triggering the plurality of on-off devices (200) to carry out on-off actions; the signal fuse wire (301) is connected with at least one copper bar (106) in parallel, and the signal fuse wire (301) is electrically connected with the control circuit board (300) through a signal connecting wire (302), so that when current flowing through the signal fuse wire (301) exceeds preset threshold current, the signal fuse wire (301) is fused and is electrically connected with the control circuit board (300); wherein the control circuit board (300) responds to the fusing of the signal fuse (301) and sends an action signal to the plurality of on-off devices (200) which are connected in series.

The utility model relates to the field of electric power facilities, in particular to a stable and reliable drop-out fuse, which comprises an insulator, an upper terminal, a lower terminal, a fuse tube, an upper static contact and a lower static contact. A fuse is arranged in the fuse tube, an upper moving contact is arranged at the upper end of the fuse tube, a lower moving contact is arranged at the lower end of the fuse tube, and the lower moving contact is movably connected to the lower static contact through a trunnion; the lower moving contact is also provided with an elastic wire pressing plate which assists in tensioning the fuse wire. The lower moving contact is provided with a first line pressing terminal, the lower static contact is provided with a second line pressing terminal, and the lower end of the fuse is led out from the fuse tube, penetrates through the first line pressing terminal and then is connected with the second line pressing terminal. And an insulating sheath is arranged at a position where the fuse wire is connected with the elastic wire pressing plate. The sheath is additionally arranged at the contact position of the tail end of the fuse wire and the fuse wire pressing plate to form insulation isolation, so that current does not pass through two sides of the trunnion by the fuse wire, and the heating defect caused by poor contact between the trunnion and the lower static contact is avoided.

The invention provides a vertically-installed fuse preparation method based on secondary forming and a related device. The method comprises the steps that preparation parameters of a target vertically-installed fuse are acquired to determine preparation steps; when the preparation step is conductor preparation, obtaining a first parameter from the preparation parameters; preparing a conductor according to the first parameter; when the preparation step is first-time forming, a second parameter is obtained from the preparation parameters; carrying out injection molding according to a second parameter to obtain a base inserted with a conductor; when the preparation step is pipe body blank preparation, a third parameter is obtained from the preparation parameters; preparing a tube body blank according to the third parameter; when the preparation step is second-time forming, a fourth parameter is obtained from the preparation parameters; forming the tube body blank on the base and the electric conductor according to a fourth parameter to obtain an integrally formed initial fuse; when the preparation step is post-processing, acquiring a fifth parameter from the preparation parameters; and performing post-processing on the initial fuse according to the fifth parameter to obtain a target vertically-installed fuse.

An exemplary embodiment of an active / passive automotive fuse module in accordance with the present disclosure may include: an electrically insulating base; a fuse plate including a busbar portion disposed on a top surface of the base above a projectile cavity formed in the base, the fuse plate further including a fusible portion electrically connected to the busbar portion and adapted to disconnect when a current flowing through the fuse plate exceeds a current rating of the active / passive automotive fuse module, the active / passive automotive fuse module further including a pyrotechnic interrupter (PI) disposed on top of the base and including a projectile located above the busbar portion, the PI being configured to drive the projectile through the busbar portion when the PI is actuated.

An excitation fuse with a melt structure comprises a shell, an excitation source, at least one conducting bar and the melt structure. A first cavity and a second cavity filled with an arc extinguishing medium are arranged in the shell; the cavity where the driving force releasing end of the excitation source is located is communicated with the first cavity, and the conducting bar penetrates through the shell and the first cavity; the melt structure is arranged at least partially in the arc extinguishing medium in the second cavity or penetrates through the arc extinguishing medium in the second cavity; the fuse body structure comprises a fuse body connected with the conducting bar in parallel and insulation isolation pieces, at least one insulation isolation piece is arranged on the fuse body in the current direction, the fuse body penetrates through the insulation isolation pieces, and the insulation isolation pieces are used for partially or completely isolating electric arcs at fractures of the fuse body and releasing gas and cooling the electric arcs at the high temperature of the electric arcs. The excitation fuse uses a melt structure, so that the breaking performance of the fuse and the insulating performance and the voltage resistance after breaking can be improved.

Embodiments are directed to electronic fuse devices and systems. One such electronic fuse includes current sensing circuitry that senses a current in a conductor coupled between a power supply and a load, and generates a current sensing signal indicative of the sensed current. I2t circuitry receives the current sensing signal and determines whether the sensed current exceeds an I2t curve of the conductor. The electronic fuse further includes at least one of external MOSFET temperature sensing circuitry that senses a temperature of an external MOSFET coupled to the conductor, low current bypass circuitry that supplies a reduced current to the load in a low power consumption mode during which the external MOSFET is in a non-conductive state, or desaturation sensing circuitry that senses a drain-source voltage of the external MOSFET.

The invention provides a power storage device and a current interruption method. A power storage device is provided with a power storage device module, a voltage sensor, a current sensor, an explosion fuse, and a controller. The voltage sensor detects a voltage value of the power storage device module. The current sensor detects a value of a current flowing through the power storage device module. The explosion fuse is connected in series with the power storage device module. In the controller, a voltage condition and a current condition are set. The voltage condition is predetermined according to a voltage value detected by the voltage sensor. The current condition is predetermined according to the current value detected by the current sensor. The controller operates the explosion fuse when both a voltage condition and a current condition are satisfied.

The invention provides a combined full-range controllable protection device, which belongs to the technical field of circuit protection and comprises a trigger body, a breaker and a fuse. The trigger body and the breaker are connected in series, and the trigger body and the breaker which are connected in series are connected in parallel with the fuse; when the circuit is abnormal, the trigger body is fused to carry out primary protection on the circuit, the fused trigger body also generates an electric signal and transmits the electric signal to the breaker, the breaker cuts off the circuit to carry out secondary protection on the circuit, current flowing through the trigger body and the breaker is merged into a branch where the fuse is located, and the fuse is fused to form third-level protection on the circuit; therefore, multi-stage protection is realized through the trigger body, the breaker and the fuse, and the time sequence cooperation of multi-stage protection actions not only avoids misoperation, but also can provide redundancy protection when a serious fault occurs, so that quick response and reliable cut-off when the circuit is abnormal are realized on the basis of keeping low loss when the circuit is normal, and the circuit breaker can be suitable for high-voltage and large-current breaking.

The utility model provides a fuse state monitoring circuit and a power distribution system, the fuse state monitoring circuit comprises a fuse connected between a power supply and a load, and the other end of the load is grounded; two ends of the fuse are respectively connected with a first resistor and a second resistor, and the other end of the first resistor and the other end of the second resistor are connected in series with a third resistor to be grounded after being connected; the fuse protection circuit further comprises a voltage sampling circuit which is connected with the voltage sampling end of the third resistor through a sampling channel, and the state of the fuse is monitored according to the sampling voltage of the voltage sampling circuit to the third resistor. According to the invention, state monitoring and voltage monitoring of the fuse are realized by differentiating voltages at two ends of the fuse and connecting the resistors in series, voltage detection of a circuit can be realized, state monitoring of the fuse can also be realized, and the fuse monitoring circuit has the advantages of simple structure and low cost.

Disclosed is a switchgear cabinet with a magnetic blow-out load switch, comprising a cabinet body, wherein a cable compartment, a mechanism compartment, a sealed gas compartment, and a fuse compartment are arranged within the cabinet body. A three-phase top insulating sleeve is arranged at the top of the sealed gas compartment, a three-phase bottom insulating sleeve is arranged at the bottom of the fuse compartment, and the three-phase bottom insulating sleeve penetrates into the cable compartment to connect to an incoming cable and an outgoing cable. A three-phase magnetic blow-out load switch is installed within the sealed gas compartment, and an operating mechanism for the load switch is installed at an upper part within the mechanism compartment and located on an outer side of a front panel of the sealed gas compartment. A three-phase fuse is arranged within the fuse compartment, a fuse striker-pin tripping mechanism is installed at a bottom part within the mechanism compartment, and a small fuse grounding switch is further installed within the fuse compartment. The present invention uses a magnetic blow-out arc extinguishing assembly to increase a strong magnetic field to directionally guide and concentrate electrons and ions of an electric arc, and performs rapid arc interruption and arc extinguishing by means of an arc extinguishing apparatus, effectively improving the arc extinguishing capacity of the load switch, and solving the technical problem of load switches in high-voltage load switch cabinets having low arc extinguishing capacity.

The utility model discloses a confluence cabinet, which comprises a confluence cabinet body and a protection assembly, a first input copper bar group, a first output copper bar group, a second input copper bar group, a second output copper bar group and an isolating switch are arranged in the confluence cabinet body, and the first input copper bar group and the first output copper bar group are correspondingly arranged on two sides of the isolating switch along a first direction. And the switch is electrically connected with the isolating switch. And the second input copper bar group and the second output copper bar group are correspondingly arranged on two sides of the isolating switch along the first direction and are electrically connected with the isolating switch. And the first input copper bar group and the second input copper bar group are arranged at intervals along the second direction. And the isolating switch has a switch-on state and a switch-off state and is used for isolating the confluence cabinet from a power utilization system. The protection assembly comprises direct current fuses which are respectively arranged in the first input copper bar group and the second input copper bar group and are used for protecting circuits and equipment from being damaged by overcurrent, so that the safety and the reliability of the system are improved.

The invention relates to the technical field of transformer overload protection, in particular to a transformer overload protection device with a mechanical self-adaptive adjustment function. The transformer overload protection device with the mechanical self-adaptive adjustment function comprises a supporting frame, a transformer, an installation frame, a drop-out fuse, a sliding rail, a lifting frame, a supporting block, a closing piece, a spring, a control assembly and a self-adaptive adjustment assembly, the transformer is installed on the lower side of the supporting frame, and the installation frame is connected to the upper side of the supporting frame. Through the preset height difference of the closing piece and the linkage design of the control assembly, the standard closing sequence of a windward side, a leeward side and a middle phase is achieved, the interphase short circuit risk caused by manual operation errors is avoided, the safety of electric power operation is remarkably improved, meanwhile, the self-adaptive adjusting assembly automatically adjusts the height of the closing piece according to the wind direction, and the safety of electric power operation is improved. The closing time sequence is further optimized, and the harm of the arc to equipment and operators is reduced.

A degradation determination device determines whether each of a first opening / closing device and a fuse provided on a power path is in a degraded state. The power path has a positive electrode-side power line and a negative electrode-side power line. The first opening / closing device and the fuse are provided on the negative electrode-side power line. The degradation determination device is provided with a first potential detection unit that detects a first potential at one end of the first opening / closing device and a second potential at the opposite end thereof, a second potential detection unit that detects a first potential at one end of the fuse and a second potential at the opposite end thereof, and a control unit that determines whether each of the first opening / closing device and the fuse is in a degraded state, based on a potential difference between the first and second potentials.

The invention discloses a rapid fusing device for adaptive overload protection, and belongs to the technical field of overload protection. Comprising a multi-dimensional monitoring module used for collecting circuit current, environment temperature and humidity and equipment operation parameters in real time; the intelligent processing module is internally provided with a self-adaptive algorithm unit, and dynamically calculates and adjusts a multi-stage fusing threshold value based on real-time acquired data; the rapid execution module comprises a composite fusing structure and an arc extinguishing unit, and the composite fusing structure executes overload early warning, graded fusing or complete cutting action according to the multi-stage fusing threshold value; and the communication interaction module is used for realizing device state remote monitoring, threshold parameter remote configuration and fault information uploading. Parameters such as current, temperature and humidity are collected in real time through the multi-dimensional monitoring module, a multi-stage fusing threshold value is dynamically adjusted in combination with a self-adaptive algorithm of the intelligent processing module, the limitation that the threshold value of a traditional fuse is fixed is broken through, load fluctuation and environment change can be accurately adapted, and mistaken fusing or protection lag is avoided.

The utility model relates to a fuse for a charging pile, and relates to the technical field of fuses, the fuse comprises an insulating shell and a fuse piece located in the insulating shell, baffle plates are arranged at openings at two ends of the insulating shell, and connecting pieces are fixedly arranged on the side surfaces, far away from the insulating shell, of the baffle plates; one baffle is provided with a sand filling hole and a plugging button for plugging the sand filling hole; the edge of an opening in the end part of the insulating shell is provided with a fixed sinking groove for the baffle plate to insert, the periphery of the insulating shell is provided with a locking through hole communicated with the fixed sinking groove, and the periphery of the baffle plate is provided with a locking screw hole; a locking screw which penetrates through the locking through hole and then is screwed into the locking screw hole is arranged outside the insulating shell, and a receding sinking groove for clamping a nut part of the locking screw is formed in the edge of an opening in the outer side of the locking through hole; after the baffle is installed, the exposed outer side face of the baffle is flush with the end face of the insulating shell, and the influence of collision on the joint of the baffle and the insulating shell is reduced.

The invention relates to a primary and secondary fusion complete column-mounted circuit breaker, which comprises a circuit breaker body, a column mounting frame, a voltage transformer, an electronic sensor, a drop-out fuse and a controller, and is characterized in that the circuit breaker body is provided with an operation base and a plurality of solid-sealed polar poles arranged on the operation base; a vacuum arc-extinguishing chamber is arranged in the upper end of a vertical section of the solid-sealed polar pole, a connecting wire extending horizontally is arranged in a transverse section of the solid-sealed polar pole, opening and closing of the vacuum arc-extinguishing chamber are driven by an operation base, and the solid-sealed polar pole further comprises a limiting assembly arranged in the solid-sealed polar pole and a conductive linkage assembly arranged in the limiting assembly. The conductive wire connecting assembly is arranged in the limiting assembly, and the accelerating assembly is arranged in the limiting assembly and located below the mounting sleeve, so that the opening speed is accelerated. The beneficial effects of the invention lie in that the linkage assembly connected with the movable conducting rod and the driving rod realizes switching-on power-on and switching-off power-off, and can also cooperate with the acceleration assembly so as to accelerate the switching-off speed.

The invention relates to the technical field of high-voltage direct-current transmission, and particularly provides an overvoltage threshold self-adaptive adjustment protection method and device for an IGCT (integrated gate commutation current transformer), and the method comprises the steps: obtaining the real-time terminal voltage of a sub-module of a hybrid commutation current converter and the operation condition of the IGCT in the sub-module; and adjusting the overvoltage protection threshold of the IGCT in the sub-module of the hybrid commutation converter based on the real-time terminal voltage of the sub-module of the hybrid commutation converter and the operation condition of the IGCT in the sub-module. According to the technical scheme provided by the invention, a fuse can be omitted, the operation reliability of the converter valve is improved, the technical blank of related protection strategies of the lightning arrester of the hybrid commutation converter valve assembly is filled, and a reference basis is provided for the design of an engineering control protection system.

The invention discloses an intelligent switch cabinet self-wiring device, and relates to the field of wire installation, the intelligent switch cabinet self-wiring device comprises a fixed box, a plurality of junction boxes are arranged in the fixed box, and each junction box comprises an outer shell; two symmetrical rotating parts are rotationally connected in the outer shell, two symmetrical driving plates are arranged between the two rotating parts, a clamping device is arranged between the two driving plates, wire stripping knives and metal elastic sheets are arranged on the driving plates, and a driving device is arranged on the outer side of the outer shell; by arranging the fixing box and inserting the junction box into the fixing box to realize fixation, a plurality of junction boxes can be connected with the metal plate, and when a wire is inserted into the junction box, the functions of fixing and stripping the wire, connecting the wire and the fuse in series and electrically connecting the wire and the fuse with the metal plate together can be realized at one time by pulling the push-pull rod. The wiring process is simplified, and the wiring workload is reduced.