CN112946445A - External application voltage withstand test device for power transformer - Google Patents
External application voltage withstand test device for power transformer Download PDFInfo
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- CN112946445A CN112946445A CN202110532019.0A CN202110532019A CN112946445A CN 112946445 A CN112946445 A CN 112946445A CN 202110532019 A CN202110532019 A CN 202110532019A CN 112946445 A CN112946445 A CN 112946445A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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Abstract
The invention discloses an external voltage withstand test device of a power transformer, which comprises a bearing frame used for simultaneously testing a plurality of transformers, the invention synchronously realizes the safe separation and connection strengthening actions of the connecting end by connecting the triggering mechanism, and the conductive connecting mechanism can guide the input column and the grounding column to perform test actions during implementation, in the process, the connection triggering mechanism can detect the connection part of the grounding pole and the transformer so as to obtain the charged information of the surface of the transformer to carry out the grounding failure detection action, when the grounding failure detection action is carried out, the connection triggering mechanism can also guide the input column to be separated from the transformer according to the charged information on the surface of the transformer and increase the connection surface and the connection force of the connection part of the grounding column and the transformer so as to carry out column separation strengthening action.
Description
Technical Field
The invention relates to the technical field of power tests, in particular to an external withstand voltage test device of a power transformer.
Background
The transformer is a device which changes alternating voltage by applying the principle of electromagnetic induction, is an extremely important device in power construction, is extremely widely applied in the current production and life, and due to the important status, a withstand voltage test needs to be carried out on the transformer, and the externally applied withstand voltage test is a test of applying power frequency high voltage of one minute to the tested transformer, which is also called a power frequency withstand voltage test. The method is only suitable for the full-insulation transformer because the insulation performance between different side windings and the insulation performance between windings and the ground are checked, namely the level of main insulation of the transformer is checked. Therefore, different side windings of the tested transformer are connected together during the test, voltage is applied to one side winding, and the other side winding is grounded. When a withstand voltage test is externally applied, switching on when the power supply voltage is lower; when the test power supply voltage reaches below 40% of the test voltage, the boosting speed is arbitrary; above 40%, it should rise uniformly at a rate of 3% per second; after reaching the specified voltage and duration, the voltage should be rapidly and uniformly reduced to the test voltage within 5 s.
When a voltage withstand test is carried out, a voltage withstand test device is needed, but the voltage withstand test device of a common transformer has a complex structure, the number of transformers which can be tested at one time is small, and the working efficiency is low.
In view of the above problems, according to the prior art, for example, patent application No. 201911073298.8, the patent name is an invention of a withstand voltage test apparatus for transformer processing, which is characterized in that a plurality of transformers can be placed at one time through a transformer support, a withstand voltage test can be performed on a winding and a magnetic core of a transformer through a first probe card and a second probe card, and due to a first air cylinder and a second air cylinder, when performing the withstand voltage test, a worker only needs to place the transformer in a transformer positioning groove and after the test is performed
The transformer take out can, very big improvement work efficiency, solved general transformer test device, the structure is comparatively complicated, and the transformer that once only can be tested is quantity not many, the lower problem of work efficiency.
However, such operation has limitations when the grounding wire is bad, for example, when a plurality of transformers are simultaneously tested, once the grounding wire of a single transformer is not firmly connected, the winding leading to the high-voltage end is easily damaged, and even the leakage phenomenon occurs in severe cases, so that the electric shock probability of an operator is greatly increased.
Therefore, the external withstand voltage test device of the power transformer in the prior art cannot solve the problem that the leakage and electric shock probability of the transformer is increased due to poor grounding of the transformer during the test.
Disclosure of Invention
The invention aims to provide an external withstand voltage test device of a power transformer, which aims to solve the technical problem that the leakage and electric shock probability of the transformer is increased due to poor grounding of the transformer in the test in the prior art.
In order to solve the technical problems, the invention specifically provides the following technical scheme:
an externally applied voltage withstand test device of a power transformer comprises a bearing frame used for testing a plurality of transformers simultaneously, wherein a conductive connecting mechanism is connected to the bearing frame, an input column and a grounding column are arranged on the surface of the conductive connecting mechanism, the conductive connecting mechanism is used for guiding the input column to be connected with one side of the transformer so as to lead external voltage into the transformer, and the grounding column is connected with the other side of the transformer so as to lead the electricity into the ground;
the conductive connecting mechanism comprises a movable frame connected with the bearing frame, and a fixed regulator for fixing the input column and the grounding column is connected to the movable frame;
the conductive connecting mechanism is connected with a connecting and triggering mechanism, and the connecting and triggering mechanism is connected with the fixed adjuster;
the connection trigger mechanism comprises a detection trigger arranged on the fixed regulator, and the detection trigger is used for carrying out bad detection action and detecting to obtain the charged information on the surface of the transformer; the input column is also used for guiding the input column to be separated from the transformer according to the charged information on the surface of the transformer;
one end of the detection trigger is connected with the input column, the other end of the detection trigger is provided with a deflection clamping device, and the deflection clamping device is connected with the grounding column; the deflection clamping device is used for performing column releasing and strengthening actions under the driving of the detection trigger, increasing the area of a connecting surface of a connecting part of the grounding column and the transformer and enhancing the connecting force between the grounding column and the transformer.
Optionally, the fixed adjuster comprises a fixed block connected with the movable frame, one end of the fixed block is provided with a fixed auxiliary release cover for fixing the input column, the other end of the fixed block is provided with an installation sleeve for fixing the grounding column, and the longitudinal section of the installation sleeve is U-shaped;
a stepped ring hole for guiding the deflection of the input column is formed in the fixed auxiliary release cover.
Optionally, the input post includes a deflection ball attached within the stepped annular bore, and guide posts mounted at both ends of the deflection ball.
Optionally, the grounding post comprises a main connecting post penetrating through the mounting sleeve, an air exhaust groove is formed in the main connecting post along the axial lead of the main connecting post, and a suction disc communicated with the air exhaust groove is mounted on the side wall of the main connecting post;
the lateral wall of keeping away from the one end of installing sleeve on the main spliced pole has been seted up a pair of dress and has been put the ladder groove, and the dress is put the ladder inslot and is connected with the grip block group, and the dress is put the ladder inslot and is equipped with and is used for driving the grip block group and revolute axis pivoted pulling strip, and the pulling strip is connected with the grip block group, and the one end that the grip block group was kept away from to the pulling strip is connected with.
Optionally, the detection trigger comprises an inflation and deflation seat connected with the fixed block, one end of the inflation and deflation seat is provided with a pushing column for pushing the deflection ball to deflect in the stepped annular hole, the pushing column is connected with the guide column, and the other end of the inflation and deflation seat is connected with the deflection clamping device;
the bottom of inflating and deflating the seat is connected with the extension pipe that runs through fixed block to the outside, installs in the extension pipe and leads electrical pillar, and the extension pipe is kept away from the one end of inflating and deflating the seat and is installed the magnetic block ring, the other end of extension pipe with inflate and deflate seat sealing connection.
Optionally, the inflation and deflation seat comprises a fixed cavity, a pushing block and a driving sheet which are all connected with the surface of the fixed block, a separation cover is arranged in the fixed cavity, a return spring is arranged on the inner wall of the top of the separation cover, an air isolation block is arranged at one end, close to the fixed block, of the return spring, and an exhaust hole with an I-shaped longitudinal section is formed in the air isolation block;
the bottom of the separation cover is provided with an attraction electromagnetic block which is used for guiding the air isolation block to move towards one side of the fixed block, and the attraction electromagnetic block is connected with the conductive post;
the pushing block is connected to the inner wall of one end of the fixed cavity close to the input column, and a left end chamber is formed between the pushing block and the separation cover; the driving sheet is connected to the inner wall of the other end of the fixed cavity, and a right end chamber is formed between the driving sheet and the separation cover;
the surface of the pushing block, close to one side of the input column, is connected with the pushing column, the surface of the other side of the pushing block is provided with a suction pushing spring for pushing the pushing block to suck gas at the right end of the fixed cavity into the left end of the fixed cavity, and the suction pushing spring is connected with the side wall of the separation cover.
Optionally, the side wall of the separation cover is provided with an air guide hole for communicating the left end of the fixed cavity with the right end of the fixed cavity, and the length of the left end of the fixed cavity is greater than that of the right end of the fixed cavity.
Optionally, the deflecting clamping device comprises an air guide column and a fixing cover, the end part of the air guide column is hermetically connected with the fixing chamber, and the fixing cover is connected to one end, far away from the fixing chamber, of the air guide column;
the side wall of the gas guide column is provided with a pumping and releasing pipe for pumping gas in the gas guide column, the pumping and releasing pipe is connected with an external pumping device, and the gas guide column and the pumping and releasing pipe are combined to form a T-shaped structure; an air exhaust bag communicated with the air exhaust groove is arranged in the fixed cover, a fixing sheet is arranged at one end of the air exhaust bag far away from the fixed cover, and one end of the pulling strip far away from the clamping block group extends into the fixed cover and is connected with the fixing sheet;
the surface of the fixed sheet is provided with a flexible metal sheet connected with the driving sheet, and the flexible metal sheet enters the fixed cavity along the air guide column.
Optionally, the clamping block group comprises a plurality of clamping pieces, the clamping pieces are rotatably connected to the inner wall of the stepped groove through a rotating shaft, the longitudinal sections of the clamping pieces are of U-shaped structures, and one ends, close to the rotating shaft, of the clamping pieces are connected with the pulling strip.
Optionally, the pulling strip comprises a vertical moving strip and a plurality of hook strips; the hook strip is in a V-shaped structure and is used for pulling the clamping piece.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the connection triggering mechanism is arranged, so that the safe separation and connection reinforcement actions of the connecting end are synchronously realized; when the grounding fault detection device is implemented, the conductive connecting mechanism can guide the input column to be connected with one side of the transformer so as to conduct the action of leading external voltage into the transformer, meanwhile, the grounding column is guided to be connected with the other side of the transformer so as to conduct electricity into the ground, the connection triggering mechanism can detect the connection position of the grounding column and the transformer so as to obtain the charged information of the surface of the transformer to conduct the grounding fault detection action, and the connection triggering mechanism can guide the input column to be separated from the transformer according to the charged information of the surface of the transformer and increase the connection surface and the connection force of the connection position of the grounding column and the transformer so as to achieve the purpose of column separation and reinforcement.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
FIG. 1 is a schematic overall structure diagram of an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a connection triggering mechanism according to an embodiment of the present invention;
FIG. 3 is a schematic view of a pull strip configuration according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a ground pillar according to an embodiment of the invention.
The reference numerals in the drawings denote the following, respectively:
1-a bearing frame; 2-a conductive connection mechanism; 3-connecting a trigger mechanism; 4-input column; 5-a grounding post;
21-a movable frame; 22-a fixed adjuster;
221-fixed block; 222-fixed auxiliary release cover; 223-mounting the sleeve; 224-a stepped annular ring;
31-detect a trigger; 32-a deflecting retainer;
311-inflation and deflation seat; 312-a pushing post; 313-an extension tube; 314-conductive pillars; 315-magnet ring;
3111-a stationary chamber; 3112-a push block; 3113-driving the sheet; 3114-separating cover; 3115-restoring the spring; 3116-air-tight block; 3117-exhaust holes; 3118-attracting electromagnet blocks; 3119-suction push spring; 3120-gas vents;
321-a gas guiding column; 322-a stationary shield; 323-a drainage pipe; 324-air pumping bag; 325-fixing piece; 326-flexible metal sheet;
41-deflection ball; 42-guide posts;
51-a main post; 52-air exhaust groove; 53-a holding pan; 54-placing the stepped groove; 55-clamping block group; 56-a pull bar;
551-clamping piece; 561-vertical moving bar; 562-hook strip.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the present invention provides an external withstand voltage test apparatus for a power transformer, which includes a carrier 1 for testing a plurality of transformers simultaneously, a conductive connection mechanism 2 having an input post 4 and a ground post 5 disposed on a surface thereof connected to the carrier 1, and a connection trigger mechanism 3 connected to the conductive connection mechanism 2.
The conductive connection mechanism 2 is used for connecting the input column 4 with one side of the transformer to conduct the action of introducing the external voltage into the transformer, and connecting the grounding column 5 with the other side of the transformer to conduct the electricity into the ground.
The connection triggering mechanism 3 is used for detecting the surface of the transformer so as to obtain the charged information of the surface of the transformer to perform a grounding failure detection action, and is used for guiding the input column 4 to be separated from the transformer and increasing the connection surface and the connection force of the connection part of the grounding column 5 and the transformer so as to perform a column separation strengthening action according to the charged information of the surface of the transformer in the process of performing the grounding failure detection action.
The external withstand voltage test device of the power transformer provided by the embodiment can synchronously realize the safe separation and connection strengthening actions of the connection end through the connection triggering mechanism 3, in the implementation, the conductive connection mechanism 2 leads the input column 4 to be connected with one side of the transformer to conduct the action of leading the external voltage into the transformer, and simultaneously leads the grounding column 5 to be connected with the other side of the transformer to conduct the electricity into the ground, in the process, the connection triggering mechanism 3 detects the connection part of the grounding pole 5 and the transformer so as to obtain the charged information of the surface of the transformer to perform the grounding fault detection action, and in the process of carrying out the grounding failure detection action, the connection triggering mechanism 3 can guide the input column 4 to be separated from the transformer according to the charged information on the surface of the transformer and increase the connection surface and the connection force of the connection part of the grounding column 5 and the transformer so as to carry out the column separation strengthening action.
Specifically, as shown in fig. 1 and 2, the conductive connection mechanism 2 includes a movable frame 21 connected to the carriage 1, a fixed adjuster 22 for fixing the input column 4 and the ground column 5 is connected to the movable frame 21, and the connection trigger mechanism 3 is connected to the fixed adjuster 22.
The connection triggering mechanism 3 comprises a detection trigger 31 which is arranged on the fixed adjuster 22 and used for detecting and obtaining the charged information of the surface of the transformer and guiding the input column 4 to be separated from the transformer according to the charged information of the surface of the transformer, one end of the detection trigger 31 is connected with the input column 4, and the other end of the detection trigger 31 is provided with a deflection clamping device 32 which is connected with the grounding column 5 and used for being driven by the detection trigger 31 to increase the connection surface and the connection force of the connection part of the grounding column 5 and the transformer.
In order to synchronously realize the safe separation of the connecting end and the connection strengthening action, in the implementation, the input column 4 and the grounding column 5 can be guided to be respectively connected with two sides of a transformer through the movable frame 21, after the input column 4 and the grounding column 5 are fully connected, external voltage is led into the transformer through the input column 4, electricity is led into the ground through the grounding column 5, so that a withstand voltage test action is carried out, in the process of carrying out the withstand voltage test action, the detection trigger 31 is used for detecting and obtaining the electrified information on the surface of the transformer, the input column 4 is guided and driven to be separated from the transformer according to the electrified information on the surface of the transformer, so that the safe separation action of the input column 4 is realized, and meanwhile, the detection trigger 31 is used for driving the deflection clamping device 32 to move so as to increase the connecting surface and.
In this embodiment, input post 4 and ground post 5 are connected with the winding of transformer both sides and are drawn forth the end respectively, and the structure of this winding is drawn forth the structure and is similar to patent application No. 202020958329.X, and the patent name is power transformer's the utility model patent of applying withstand voltage test subassembly outward.
As shown in fig. 1 and 2, the fixed adjuster 22 includes a fixed block 221 connected to the movable frame 21, a fixed auxiliary releasing cover 222 for fixing the input column 4 is installed on one side wall of the fixed block 221, and an installation sleeve 223 having a u-shaped longitudinal section and used for fixing the grounding column 5 is installed on the other side wall of the fixed block 221; a stepped ring hole 224 for guiding the deflection of the input column 4 is formed in the fixed auxiliary release cover 222; the input post 4 is composed of a deflection ball 41 connected in a stepped ring hole 224 and guide posts 42 installed at both ends of the deflection ball 41.
The fixed adjuster 22 is used to fixedly restrict the position of the input post 4 and the ground post 5 so that the input post 4 and the ground post 5 can be disengaged and tightened relatively quickly and sensitively.
The fixed auxiliary release cover 222 is mainly used for assisting the input column 4 to perform a releasing action, the fixed auxiliary release cover 222 may be made of an insulating material, wherein the input column 4 is connected to an external device for applying a voltage, the grounding column 5 is grounded through a wire, once the detection trigger 31 moves and applies a pushing force to one of the guide posts 42 of the deflection ball 41 (for example, the upper end of the deflection ball 41 in fig. 1), the deflection ball 41 slides and deflects in the stepped ring hole 224 to drive the guide post 42 at the lower end of the deflection ball 41 to be released from one side of the transformer, so that the transformer is not receiving a high voltage from the input column 4.
As shown in fig. 3 and 4, the ground post 5 includes a main post 51 penetrating through the mounting sleeve 223, an air suction groove 52 is formed on the main post 51 along an axial line of the main post 51, a suction disc 53 communicating with the air suction groove 52 is mounted on a side wall of the main post 51, a pair of installation stepped grooves 54 is formed on a side wall of one end of the main post 51 far from the mounting sleeve 223, a clamping block set 55 is connected in the installation stepped grooves 54, a pulling bar 56 connected to the clamping block set 55 and used for driving the clamping block set 55 to rotate around a rotating shaft is arranged in the installation stepped grooves 54, and one end of the pulling bar 56 far from the clamping block set 55 is connected to the deflection locking device 32.
The clamping block set 55 comprises a plurality of clamping pieces 551 which are rotatably connected to the inner wall of the stepped containing groove 54 through a rotating shaft, the longitudinal section of each clamping piece 551 is in a U-shaped structure, and one end, close to the rotating shaft, of each clamping piece 551 is connected with the pulling strip 56.
The pulling strip 56 is composed of a vertical moving strip 561 and a plurality of hook strips 562 in a "√" shaped structure for pulling the grip tab 551.
In order to realize the reinforcing action, when the deflection locking device 32 is implemented, once the deflection locking device 32 is driven by the trigger 31, the deflection locking device 32 guides the vertical moving bar 561 to vertically slide along the containing stepped groove 54, and the sliding vertical moving bar 561 drives the end part of the clamping piece 551 to move through the hook bar 562.
The revolving force of needle for holding piece 551 roll-off dress is put in the ladder groove 54 gradually, and holding piece 551 is at the roll-off in-process, and holding piece 551 can block the transformer winding gradually and draw forth the end, dwindles the opening of U "font gradually simultaneously, makes holding piece 551 apply the clamping-force of drawing forth the end for the transformer winding great, can not appear not hard up phenomenon easily, so just accomplished the operation of increase connection face and preliminary increase connection power.
When the deflecting locking device 32 is driven by the trigger 31, the air in the air extracting groove 52 is extracted, and at the moment, the holding disc 53 is tightly attached to the leading-out end of the transformer winding, so that when the air in the air extracting groove 52 is reduced, the holding disc 53 is gradually held on the side wall of the leading-out end of the transformer winding, and the operation of increasing the connecting force is fully achieved.
As shown in fig. 1 and 2, the detection trigger 31 includes an inflation/deflation seat 311 connected to the fixed block 221, a pushing column 312 connected to the guide column 42 and used for pushing the deflection ball 41 to deflect in the stepped ring hole 224 is disposed at one end of the inflation/deflation seat 311, the other end of the inflation/deflation seat 311 is connected to the deflection locking device 32, an extension tube 313 penetrating through the fixed block 221 to the outside is connected to the bottom of the inflation/deflation seat 311, a conductive column 314 is installed in the extension tube 313, a magnetic block ring 315 is installed on the side wall of one end of the extension tube 313 far from the inflation/deflation seat 311, and the other end of the extension tube 313 is hermetically connected to the inflation/deflation seat 311.
For the purpose of detection, in practice, the extended extension pipe 313 is pulled directly until the magnet ring 315 attracts the transformer casing, so that the detection operation can be performed; the position is not fixed, the specific holding position is set by a user, and when the transformer shell is electrified, the conductive column 314 is electrified, so that the components in the charging and discharging seat 311 work to perform safe separation (the finger input column 4) and connection reinforcement (the finger grounding column 5) of the connecting end; the suction electromagnetic block 3118 may be a relay, a fuse, or the like that is immediately activated when electricity is detected, and the suction electromagnetic block 3118 selected here may be replaced by a return spring 3115 and a gas barrier block 3116 that are flipped over to control the compression of the fuse or the like by the return spring 3115, and the return spring 3115 may push the gas barrier block 3116 to activate when the fuse is electrically blown.
In this embodiment, the side wall of the extension pipe 313 is provided with a plurality of ring grooves, so that the extension pipe 313 can freely extend in length, and the conductive pillar 314 specifically can be composed of a spiral insulating sleeve and a guide wire sleeved in the insulating sleeve, so that the conductive pillar 314 can move along with the extension pipe 313.
As shown in fig. 1 and 2, the air charging and discharging seat 311 includes a fixed chamber 3111 connected to the surface of the fixed block 221, a pushing block 3112 and a driving plate 3113, a separating cover 3114 is installed in the fixed chamber 3111, a return spring 3115 is installed on the inner wall of the top of the separating cover 3114, an air isolating block 3116 is installed at one end of the return spring 3115 close to the fixed block 221, an air discharging hole 3117 with an i-shaped longitudinal section is opened on the air isolating block 3116, so that the air discharging hole 3117 is arranged to make the air isolating block 3116 slide with a smaller resistance and easier, and an electromagnetic attracting block 3118 connected to the conductive column 314 and used for guiding the air isolating block 3116 to move to one side of the fixed block 221 is installed at the bottom of the separating cover 3114.
Promote piece 3112 and connect the one end inner wall that is close to input post 4 at fixed cavity 3111, and promote piece 3112 and separate and form the left end room between the cover 3114, drive the other end inner wall that fixed cavity 3111 is connected to piece 3113, and drive piece 3113 and separate and form the right end room between the cover 3114, promote one side surface that piece 3112 is close to input post 4 and be connected with promotion post 312, the opposite side surface mounting who promotes piece 3112 has and separates the cover 3114 lateral wall and be connected and be used for promoting the suction that promotes piece 3112 will fix the gaseous fixed cavity 3111 right-hand member left end of 3111 and push spring 3119.
In order to solve the synchronization problem of safe detachment and reinforcement, the sidewall of the separation cover 3114 is provided with a gas guide hole 3120 for communicating the left end of the fixed chamber 3111 with the right end of the fixed chamber 3111, the length of the left end of the fixed chamber 3111 is greater than that of the right end of the fixed chamber 3111, and the arrangement is such that the gas in the right end chamber can be fully sucked away, that is, the suction force of the left end chamber is greater.
When the conductive post 314 detects electricity, the attracting electromagnet block 3118 is triggered; in order to ensure that the attracting electromagnet block 3118 is not burnt, a protection device is installed on the attracting electromagnet block 3118, and the specific structure of the protection device is set according to the requirement; accordingly, the metal air-blocking block 3116 is driven to descend along the partition cover 3114 until it is closely attached to the electromagnetic block 3118, and at this time, the exhaust hole 3117 is communicated with the air guide hole 3120, that is, the left end chamber is communicated with the right end chamber.
When the left and right end chambers are not in communication, the suction push spring 3119 is in a compressed state; after left end room and right end room intercommunication, the suction pushes away the spring 3119 and can open gradually, the suction that later expands pushes away the spring 3119 and can push away the piece 3112 and move towards the direction of keeping away from the partition cover 3114, can make the space of left end room increase in the activity process of piece 3112 that promotes, the pressure of later left end room reduces and makes the indoor gas of right end room be sucked into left end room, the piece 3112 that promotes of activity simultaneously still can promote the activity of promotion post 312, make to promote post 312 and drive input post 4 and carry out the action of breaking away from safely.
In the process that the gas in the right chamber is pumped into the left chamber, the driving piece 3113 slides on the inner wall of the right chamber, and then the sliding driving piece 3113 directly drives the deflection locking device 32 to move, so that the grounding column 5 can perform the strengthening action while the input column 4 performs the safe disengaging action.
In this embodiment, in order to ensure the sealing property during sliding, the sliding member may have a structure similar to that of a piston.
As shown in fig. 2, the deflecting locking device 32 includes an air guide pillar 321 whose end is hermetically connected to the fixed chamber 3111 and a fixed cover 322 connected to one end of the air guide pillar 321 far from the fixed chamber 3111, an exhaust tube 323 connected to an external suction device and used for exhausting air in the air guide pillar 321 is installed on a sidewall of the air guide pillar 321, the air guide pillar 321 and the exhaust tube 323 are combined to form a "T" shaped structure, an exhaust bag 324 communicated with the exhaust groove 52 is installed in the fixed cover 322, a fixing plate 325 is installed on one end of the exhaust bag 324 far from the fixed cover 322, one end of the pulling bar 56 far from the clamping block set 55 extends into the fixed cover 322 and is connected to the fixing plate 325, and a flexible metal sheet 326 which enters the fixed chamber 3111 along the air guide pillar 321 and is connected to the driving sheet 3113 is installed on a surface of the fixing plate.
When the driving plate 3113 is moved, the flexible metal plate 326 is directly driven by the driving plate 3113 to pull the fixing plate 325 to slide along the inner wall of the fixing cover 322, and the fixing plate 325 directly pulls the air pumping bag 324 to perform air pumping operation in the sliding process, and when the air pumping bag 324 pumps air, the air in the air pumping groove 52 is directly pumped out, so that the holding plate 53 slowly sucks the winding leading-out end.
The fixing plate 325 also guides the pulling strip 56 to move during the sliding process, so as to perform the connecting surface enlarging action.
After the safety separation operation is completed, the test is required to be continued, at this time, the gas in the gas guiding column 321 is pumped out from the exhaust pipe 323 through an external suction device, and in the process of discharging the gas in the gas guiding column 321, the gas at one side of the driving sheet 3113 away from the separation cover 3114 is directly pumped out, at this time, the gas in the left end chamber enters the right end chamber, and then the suction push spring 3119 is driven and compressed by the push block 3112, so that the input column 4 is reset, but because the flexible metal sheet 326 is flexible, the air pumping bag 324 cannot be pushed to reset, so that the strengthening action cannot be reset easily, if the air pumping bag 324 needs to be reset, only the transformer needs to be taken away, so that the holding disc 53 releases the winding leading-out end; in this operation, the restoring spring 3115 may be provided with a self-locking post, so that the restoring spring 3115 cannot be easily reset without external force, that is, in the operation process of performing the continuous test, the self-locking post is controlled to release the restoring spring 3115 after the completion of the above operation, so that the restoring spring 3115 guides the gas barrier 3116 to reset.
In this embodiment, the flexible metal plate 326 is similar to the tape, and the inner diameter of the end of the gas guiding column 321 close to the fixed cavity 3111 is larger than the inner diameter of the end of the gas guiding column 321 far from the fixed cavity 3111, so that the gas guiding column 321 will not leak gas when the exhaust pipe 323 exhausts, i.e. only gas on the side of the driving plate 3113 far from the separating cover 3114 can be exhausted.
The above embodiments are only exemplary embodiments of the present application, and are not intended to limit the present application, and the protection scope of the present application is defined by the claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the present application and such modifications and equivalents should also be considered to be within the scope of the present application.
Claims (10)
1. The external withstand voltage test device of the power transformer is characterized by comprising a bearing frame (1) for testing a plurality of transformers simultaneously, wherein a conductive connection mechanism (2) is connected to the bearing frame (1), an input column (4) and a grounding column (5) are arranged on the surface of the conductive connection mechanism (2), the conductive connection mechanism (2) is used for guiding the input column (4) to be connected with one side of the transformer so as to guide external voltage into the transformer, and the grounding column (5) is connected with the other side of the transformer so as to guide electricity into the ground;
the conductive connection mechanism (2) comprises a movable frame (21) connected with the bearing frame (1), and a fixed regulator (22) used for fixing the input column (4) and the grounding column (5) is connected to the movable frame (21);
the conductive connection mechanism (2) is connected with a connection trigger mechanism (3), and the connection trigger mechanism (3) is connected with the fixed adjuster (22);
the connection trigger mechanism (3) comprises a detection trigger (31) arranged on the fixed regulator (22), and the detection trigger (31) is used for carrying out a bad detection action and detecting to obtain the charged information of the surface of the transformer; the input column (4) is also used for guiding the input column to be separated from the transformer according to the charged information of the surface of the transformer;
one end of the detection trigger (31) is connected with the input column (4), the other end of the detection trigger (31) is provided with a deflection locking device (32), and the deflection locking device (32) is connected with the grounding column (5); the deflection locking device (32) is used for performing column releasing strengthening action under the driving of the detection trigger (31), increasing the area of a connecting surface of a connecting part of the grounding column (5) and the transformer and enhancing the connecting force between the grounding column (5) and the transformer.
2. The external withstand voltage test device of the power transformer according to claim 1, wherein the fixed adjuster (22) comprises a fixed block (221) connected to the movable frame (21), one end of the fixed block (221) is provided with a fixed auxiliary release cover (222) for fixing the input column (4), the other end of the fixed block (221) is provided with a mounting sleeve (223) for fixing the grounding column (5), and the longitudinal section of the mounting sleeve (223) is "U" -shaped;
a stepped ring hole (224) for guiding the deflection of the input column (4) is formed in the fixed auxiliary release cover (222).
3. The external withstand voltage test device of the power transformer of claim 2, wherein the input column (4) comprises a deflection ball (41) connected in the stepped ring hole (224), and guide columns (42) installed at both ends of the deflection ball (41).
4. The external withstand voltage test device of the power transformer according to claim 3, wherein the grounding column (5) comprises a main connecting column (51) penetrating through a mounting sleeve (223), an air suction groove (52) is formed in the main connecting column (51) along the axial lead of the main connecting column (51), and a suction disc (53) communicated with the air suction groove (52) is mounted on the side wall of the main connecting column (51);
keep away from the lateral wall of the one end of installing sleeve (223) on main spliced pole (51) and seted up a pair of dress and put ladder groove (54), the dress is put ladder groove (54) in and is connected with grip block group (55), be equipped with in dress and be used for driving grip block group (55) revolute pivot pivoted pulling strip (56) in putting ladder groove (54), pulling strip (56) are connected with grip block group (55), pulling strip (56) are kept away from the one end of grip block group (55) with the card ware (32) that deflects are connected.
5. The external withstand voltage test device of the power transformer according to claim 4, wherein the detection trigger (31) comprises an air charging and discharging seat (311) connected with the fixed block (221), one end of the air charging and discharging seat (311) is provided with a pushing column (312) for pushing the deflection ball (41) to deflect in the stepped ring hole (224), the pushing column (312) is connected with the guide column (42), and the other end of the air charging and discharging seat (311) is connected with the deflection locking device (32);
the bottom of inflation and deflation seat (311) is connected with extension pipe (313) that runs through fixed block (221) to the outside, install in extension pipe (313) and lead electrical pillar (314), magnet block ring (315) are installed to the one end that extension pipe (313) kept away from inflation and deflation seat (311), the other end of extension pipe (313) with inflation and deflation seat (311) sealing connection.
6. The external application voltage withstand test device of the power transformer according to claim 5, wherein the charging and discharging seat (311) comprises a fixed chamber (3111), a pushing block (3112) and a driving sheet (3113) which are all connected with the surface of the fixed block (221), a separation cover (3114) is installed in the fixed chamber (3111), a return spring (3115) is installed on the inner wall of the top of the separation cover (3114), a gas barrier block (3116) is installed at one end, close to the fixed block (221), of the return spring (3115), and an exhaust hole (3117) with an I-shaped longitudinal section is formed in the gas barrier block (3116);
an attraction electromagnetic block (3118) for guiding the air isolation block (3116) to move towards one side of the fixed block (221) is mounted at the bottom of the separation cover (3114), and the attraction electromagnetic block (3118) is connected with the conductive column (314);
the pushing block (3112) is connected to the inner wall of one end of the fixed chamber (3111) close to the input column (4), and a left end chamber is formed between the pushing block (3112) and the separation cover (3114); the driving piece (3113) is connected to the inner wall of the other end of the fixed cavity (3111), and a right end chamber is formed between the driving piece (3113) and the separation cover (3114);
promote the surface that piece (3112) is close to one side of input post (4) and be connected with promotion post (312), the surface mounting of the opposite side of promoting piece (3112) has and is used for promoting and promotes piece (3112) to push away spring (3119) with the suction of fixed cavity (3111) right-hand member gas suction fixed cavity (3111) left end, suction push away spring (3119) with separate cover (3114) lateral wall is connected.
7. The external withstand voltage test device of the power transformer according to claim 6, wherein the side wall of the separation cover (3114) is opened with a gas vent (3120) for communicating the left end of the fixed chamber (3111) with the right end of the fixed chamber (3111), and the length of the left end of the fixed chamber (3111) is greater than the length of the right end of the fixed chamber (3111).
8. The external withstand voltage test device of the power transformer according to claim 7, wherein the deflecting latch (32) comprises an air guide pillar (321) and a fixed cover (322), the end of the air guide pillar (321) is connected with the fixed chamber (3111) in a sealing manner, and the fixed cover (322) is connected to the end of the air guide pillar (321) far away from the fixed chamber (3111);
a suction and discharge pipe (323) for sucking gas in the gas guide column (321) is mounted on the side wall of the gas guide column (321), the suction and discharge pipe (323) is connected with an external suction device, and the gas guide column (321) and the suction and discharge pipe (323) are combined to form a T-shaped structure; an air pumping bag (324) communicated with the air pumping groove (52) is installed in the fixed cover (322), a fixing sheet (325) is installed at one end, far away from the fixed cover (322), of the air pumping bag (324), and one end, far away from the clamping block group (55), of the pulling strip (56) extends into the fixed cover (322) and is connected with the fixing sheet (325);
the surface mounting of stationary blade (325) have with drive flexible sheetmetal (326) that the piece (3113) is connected, flexible sheetmetal (326) follow air guide post (321) get into in fixed cavity (3111).
9. The external withstand voltage test device of the power transformer according to claim 4, wherein the clamping block set (55) comprises a plurality of clamping pieces (551), the plurality of clamping pieces (551) are rotatably connected to the inner wall of the containing stepped groove (54) through a rotating shaft, the longitudinal section of the clamping piece (551) is in a U-shaped structure, and one end of the clamping piece (551) close to the rotating shaft is connected to the pulling strip (56).
10. The externally applied voltage withstand test device of the power transformer of claim 9, wherein the pulling bar (56) comprises a vertical moving bar (561) and a plurality of hook bars (562); the hook strip (562) is in a V-shaped structure and is used for pulling the clamping sheet (551).
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| CN114047418A (en) * | 2022-01-11 | 2022-02-15 | 南通弘宸电气设备制造有限公司 | External application voltage withstand test equipment for power transformer |
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| CN118130032A (en) * | 2024-05-08 | 2024-06-04 | 南京海关工业产品检测中心 | Product comprehensive test platform adopting button cell |
| CN118130032B (en) * | 2024-05-08 | 2024-07-05 | 南京海关工业产品检测中心 | Product comprehensive test platform adopting button cell |
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| CN118130032A (en) * | 2024-05-08 | 2024-06-04 | 南京海关工业产品检测中心 | Product comprehensive test platform adopting button cell |
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