CN110491634B - Double-insulation transformer and method for testing insulation resistance of transformer - Google Patents
Double-insulation transformer and method for testing insulation resistance of transformer Download PDFInfo
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- CN110491634B CN110491634B CN201910729760.9A CN201910729760A CN110491634B CN 110491634 B CN110491634 B CN 110491634B CN 201910729760 A CN201910729760 A CN 201910729760A CN 110491634 B CN110491634 B CN 110491634B
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- 238000009413 insulation Methods 0.000 title claims abstract description 84
- 238000012360 testing method Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims description 15
- 238000013016 damping Methods 0.000 claims abstract description 38
- 238000010521 absorption reaction Methods 0.000 claims description 22
- 230000010287 polarization Effects 0.000 claims description 14
- 230000001681 protective effect Effects 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 13
- 239000010410 layer Substances 0.000 description 6
- 230000035939 shock Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/02—Casings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/06—Mounting, supporting or suspending transformers, reactors or choke coils not being of the signal type
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Abstract
The invention provides a double-insulation transformer and a testing method of insulation resistance of the transformer, wherein sleeves are arranged on two sides of the upper end of a transformer bearing plate; a first auxiliary damping device is arranged in the sleeve; a placing plate is fixed at the upper end of the sleeve; a protection box is arranged above the placing plate; two transverse plates are fixed on opposite side walls in the protection box, two sliding grooves are formed in the two transverse plates, two sliding blocks are mounted in the two sliding grooves, the two sliding blocks on the same side form a group, a protection box is fixed at the upper ends of the two sliding blocks in the same group, the lower ends of the two protection boxes move through the sliding blocks moving on the sliding grooves, connecting rods are fixed on the two protection boxes, moving blocks are fixed on the connecting rods, and the two moving rods move in opposite directions; a bearing platform provided with a cavity is fixed between the bearing plates; a second auxiliary damping device is arranged in the cavity. The invention further provides a testing method of the insulation resistance of the transformer.
Description
Technical Field
The invention belongs to the technical field of transformers, and particularly relates to a double-insulation transformer and a method for testing insulation resistance of the transformer.
Background
The transformer is a device for changing alternating voltage by utilizing the principle of electromagnetic induction, and main components are a primary coil, a secondary coil and an iron core, namely a magnetic core, and the transformer has the following main functions: voltage conversion, current conversion, impedance conversion, isolation, voltage stabilization, i.e., a magnetic saturation transformer, and the like. According to the application, the method can be divided into: the transformer comprises a power transformer and a special transformer, wherein the special transformer comprises a furnace transformer, a rectification transformer, a power frequency test transformer, a voltage regulator, a mining transformer, an audio transformer, a medium-frequency transformer, a high-frequency transformer, an impact transformer, an instrument transformer, an electronic transformer, a reactor, a mutual inductor and the like.
Most of the existing transformers are single-layer insulated and do not have stability, the safety of the transformers in work cannot be guaranteed, and in the aspect of fixing and protecting the transformers, reasonable structures are not realized, so that the transformers are unstable in fixation and easy to damage, fire disasters are caused, and the life and property safety of people is harmed. Moreover, there is no feasible method for measuring the insulation resistance of the double-insulated transformer.
Disclosure of Invention
The invention provides a double-insulation transformer and a method for testing the insulation resistance of the transformer, which realize the protection of the transformer, solve the problems of instability and easy damage of a protection box, and provide a method for testing the insulation resistance of the transformer, thereby being convenient and feasible.
In order to achieve the purpose, the double-insulation transformer comprises 2 bearing plates, wherein sleeves are arranged on two sides of the upper ends of the bearing plates; a first auxiliary damping device is arranged in the sleeve;
the upper ends of the sleeves are jointly fixed with a placing plate; a protection box is arranged above the placing plate; two transverse plates are fixed on opposite side walls in the protection box, two sliding grooves are formed in the two transverse plates, two sliding blocks are installed in the two sliding grooves, the two sliding blocks on the same side form a group, a protection box is fixed at the upper ends of the two sliding blocks in the same group, the lower ends of the two protection boxes move on the sliding grooves through the sliding blocks, connecting rods are fixed on the two protection boxes, moving blocks are fixed on the two connecting rods, the two moving blocks are located on a screw rod with a forward thread and a screw rod with a reverse thread respectively, and the screw rods move by rotating a rotating wheel, so that the two moving rods are driven to move in opposite directions;
a bearing table with a cavity is fixed between the 2 bearing plates; and a second auxiliary damping device is arranged in the cavity.
Furthermore, the first auxiliary damping device comprises a sleeve fixed on the bearing plate, a second damping spring is fixed on the side wall of one end in the sleeve, a pressing plate is fixed at the upper end of the second damping spring, a second pressing rod is fixed on the pressing plate, and the upper end of the second pressing rod is fixed at the lower end of the placing plate.
Further, the second auxiliary damping device comprises a fixed plate arranged on the opposite side wall in the cavity and 2 support rods for fixing the lower end of the placing plate; the utility model discloses a damping device, including bearing platform, bracing piece, fixed plate, first depression bar, first damping spring's upper end, bracing piece one end runs through the plummer and extends to in the cavity, the lower extreme of bracing piece is fixed with first depression bar, first depression bar runs through the fixed plate and extends to the lower extreme of fixed plate, the cover is equipped with first damping spring on the first depression bar, the lower extreme at the bracing piece is fixed to first damping spring's upper end, the upper end at the.
Furthermore, one side of the protection box is hinged with a protection cover, and a rubber layer is coated on the side wall of the circumference in the protection box.
Furthermore, openings are formed in opposite side walls of the two protection boxes, a placing table is arranged between the two protection boxes, fixed blocks are fixed on the side walls of one sides of the two protection boxes, bolts are arranged on the two fixed blocks, two first threaded through holes are formed in the side walls of one sides of the fixed blocks, second threaded through holes corresponding to the first threaded through holes are formed in the side walls of the protection boxes, the two bolts penetrate through the first threaded through holes and extend into the second threaded through holes, a connecting rod is fixed between the two bolts, one end of the connecting rod is fixed on the side walls of the fixed blocks, moving blocks are fixed at the other ends of the two connecting rods, two lead screws are arranged on the opposite side walls in the protection boxes, and the moving blocks penetrate through the lead screws; a screw rod penetrates through the side wall of one side of the protection box, one end of each screw rod is rotatably connected to the side wall of one end of the rubber layer, and a rotating wheel is fixed at one end of each of the two screw rods; the protection box is characterized in that a third thread through hole is formed in the side wall of one side of the protection box, the two screw rods penetrate through the third thread through hole and extend into the protection box, forward threads and reverse threads are arranged on the screw rods, fifth thread through holes are formed in the two moving blocks, the screw rods penetrate through the fifth thread through holes, one of the moving blocks is located on the screw rod of the forward threads, and the other moving block is located on the screw rod of the reverse threads.
Furthermore, one end of the sleeve is a closed cylinder, and the closed end of the sleeve is fixed at the upper end of the bearing plate.
Furthermore, the protection box and the protection box are made of stainless steel.
Furthermore, a buckle is fixed on the side wall of one side of the protective cover, a clamping groove corresponding to the buckle is fixed on the side wall of the protective box, and a handle is hinged to the side wall of one end of the protective cover.
A testing method for insulation resistance of a transformer comprises the following steps:
s1: will be oneThe double-insulation transformer is connected with an ammeter, a switch and a direct current power supply in series to measure a capacitance current i1Sink current i2And leakage current i3A value of (d); the capacitance current i1The current is generated at the moment of pressurization for the direct-current voltage U acting on the double-insulation transformer; the absorption current i2Current resulting from slow polarization and sandwich polarization; the leakage current i3Is a constant current caused by the conductance of the medium; actual current i ═ i1+i2+i3；
S2: measuring the insulation resistance of the double insulation transformer by using a megohmmeter, and reading the value or stable value of 60S after the direct-current voltage is applied as the insulation resistance value; and judging the insulation condition of the transformer by calculating the absorption ratio or the polarization index.
Further, the insulation condition of the transformer is judged by adopting an absorption ratio for small and medium-sized transformers; the absorption ratio is a ratio of a 60S insulation resistance value and a 15S insulation resistance value;
describing the process of insulation absorption by adopting polarization indexes for a large transformer; the polarization index is the ratio of the insulation resistance of 10min to the insulation resistance of 1 min.
The effect provided in the summary of the invention is only the effect of the embodiment, not all the effects of the invention, and one of the above technical solutions has the following advantages or beneficial effects:
the embodiment of the invention provides a double-insulation transformer, wherein sleeves are arranged on two sides of the upper end of a bearing plate; a first auxiliary damping device is arranged in the sleeve; the upper ends of the sleeves are jointly fixed with a placing plate; a protection box is arranged above the placing plate; two transverse plates are fixed on opposite side walls in the protection box, two sliding grooves are formed in the two transverse plates, two sliding blocks are installed in the two sliding grooves, the two sliding blocks on the same side form a group, a protection box is fixed at the upper ends of the two sliding blocks in the same group, the lower ends of the two protection boxes move on the sliding grooves through the sliding blocks, connecting rods are fixed on the two protection boxes, moving blocks are fixed on the two connecting rods, the two moving blocks are located on a screw rod with a forward thread and a screw rod with a reverse thread respectively, and the screw rods move by rotating a rotating wheel, so that the two moving rods are driven to move in opposite directions; a bearing table provided with a cavity is fixed between the 2 bearing plates; a second auxiliary damping device is arranged in the cavity. The transformer protection box is reasonable in structure, the rubber layer is coated on the side wall of one circle in the protection box, the two protection boxes are arranged in the protection box, the transformer is protected, the shock absorption of the protection box is realized through the arrangement of the first shock absorption spring and the second shock absorption spring, the problems that the protection box is unstable and easy to damage are solved, the operation is simple, the applicability is strong, and the transformer protection box is suitable for popularization.
The embodiment of the invention provides a method for testing insulation resistance of a transformer, which is characterized in that a double-insulation transformer is connected with an ammeter, a switch and a direct-current power supply in series to measure capacitance current i1Sink current i2And leakage current i3And then the insulation condition of the transformer is judged by calculating the absorption ratio or the polarization index. The invention aims at a double-insulation transformer, can effectively detect the insulation integral moisture of the transformer, the moisture or dirt on the surface of a component and the centralized defects of penetrability, and is simple and easy to implement.
Drawings
Fig. 1 is a schematic external structural view of a double insulation transformer according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an internal structure of a double insulation transformer according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a screw structure of a double insulation transformer according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a sleeve of a double insulation transformer according to an embodiment of the present invention;
FIG. 5 is a wiring diagram of a testing method for insulation resistance of a transformer according to an embodiment of the present invention;
FIG. 6 is an equivalent circuit diagram and an absorption curve diagram of a dielectric insulation resistance in the testing method of the insulation resistance of the transformer according to the embodiment of the invention;
wherein 1-a carrier plate; 2-a sleeve; 3, placing a plate; 4-a protection box; 5-rotating wheel; 6-a first support bar; 7-a bearing platform; 8-a first damping spring; 9-a connecting rod; 10-fixing blocks; 11-a screw; 12-a moving block; 13-a chute; 14-a protective box; 15-a transverse plate; 16-a fixed plate; 17-a screw rod; 18-a second damping spring; 19-a second pressure bar; 20-pressing a plate; 21-a rubber layer; 22-first press rod.
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.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
Example 1
An embodiment 1 of the present invention provides a double insulation transformer, and fig. 1 shows an external structural schematic diagram of the double insulation transformer provided in the embodiment of the present invention.
Including two loading boards 1, the upper end of loading board 1 is equipped with two sleeve pipes 2, and four sleeve pipe 2's upper end is fixed with jointly and places board 3, and the supplementary damping device of sleeve pipe 2 is fixed with plummer 7 between two loading boards 1 to placing board 3 and assisting the shock attenuation, is equipped with the cavity in the plummer 7.
Fig. 2 is a schematic diagram of an internal structure of a double insulation transformer according to an embodiment of the present invention.
Be fixed with fixed plate 16 on the relative lateral wall in the cavity, the lower extreme of placing board 3 is fixed with 2 bracing pieces (6), carry out fixed stay to placing board 3, the one end of bracing piece 6 runs through plummer 7 and extends to in the cavity, the lower extreme of bracing piece 6 is fixed with first depression bar 22, first depression bar 22 runs through fixed plate 16 and extends to the lower extreme of fixed plate 16, the cover is equipped with first damping spring 8 on first depression bar 22, the lower extreme at bracing piece 6 is fixed to first damping spring 8's upper end, the upper end at fixed plate 16 is fixed to first damping spring 8's lower extreme.
A protection box 4 is fixed at the upper end of the placing plate 3, a rubber layer 21 is coated on a periphery of the side wall in the protection box 4, two transverse plates 15 are fixed on the opposite side walls in the protection box 4, two sliding grooves 13 are respectively arranged on the two transverse plates 15, two sliding blocks are respectively arranged in the two sliding grooves 13 and move in the sliding grooves 13, the two sliding blocks on the same side form a group, a protection box 14 is fixed at the upper end of the two sliding blocks in the same group, the protection box 14 moves along with the movement of the sliding blocks, openings are arranged on the opposite side walls of the two protection boxes 14, a placing table is arranged between the two protection boxes 14 and is used for placing a transformer, fixed blocks 10 are respectively fixed on the side walls on one sides of the two protection boxes 14, bolts are respectively arranged on the two fixed blocks 10, the fixed blocks and the protection boxes 14 are connected through the bolts in a threaded manner, two first threaded through holes are arranged on the side wall on one side of the, two bolts penetrate through the first threaded through hole and extend into the second threaded through hole, a connecting rod 9 is fixed between the two bolts, one end of the connecting rod 9 is fixed on the side wall of the fixed block 10, the other ends of the two connecting rods 9 are both fixed with a moving block 12, two lead screws 17 are arranged on opposite side walls in the protection box 4, the moving block 12 penetrates through the lead screws 17, the lead screws 17 fix the position of the moving block 12, a screw 11 penetrates through the side wall of one side of the protection box 4, and the schematic structural diagram of the screw of the double-insulation transformer provided by the embodiment of the invention is shown in figure 3; one end of each screw 11 is rotatably connected to one end side wall of the rubber layer 21, one end of each of the two screws 11 is fixedly provided with a rotating wheel 5, the screws 11 are rotated by rotating the rotating wheels 5, one side wall of the protection box 4 is provided with a third thread through hole, the two screws 11 all penetrate through the third thread through hole and extend into the protection box 4, the screws 11 are provided with forward threads and reverse threads, the two moving blocks 12 are provided with fifth thread through holes, the screws 11 penetrate through the fifth thread through holes, one moving block 12 is located on the screw 11 with the forward threads, the other moving block 12 is located on the screw 11 with the reverse threads, and the two moving blocks 12 move on the screw 11 with the forward threads and the screw 11 with the reverse threads respectively through the movement of the screws 11, so that the protection boxes 14 move in opposite directions to protect the transformer on the placing table.
Fig. 4 is a schematic structural diagram of a sleeve of a double insulation transformer according to an embodiment of the present invention;
the first auxiliary damping device comprises a sleeve 2 fixed on the bearing plate 1, a second damping spring 18 is fixed on the side wall of one end in the sleeve 2, a pressing plate 20 is fixed on the upper end of the second damping spring 18, a second pressing rod 19 is fixed on the pressing plate 20, the upper end of the second pressing rod 19 is fixed on the lower end of the placing plate 3, the pressing plate 20 is pressed through the second pressing rod 19, so that the second damping spring 18 is pressed, the second damping spring 18 is stretched and contracted, the placing plate 3 is damped through the elastic force of the second damping spring 18, one end of the sleeve 2 is a closed cylinder body, the closed end of the sleeve 2 is fixed on the upper end of the bearing plate 1, one side of the protection box 4 is hinged with a protective cover, the protective cover protects the protection box 4, the protection box 14 and the protection box 4 are made of stainless steel, a buckle is fixed on the side wall of one side of the protective cover, a clamping groove corresponding to the buckle is fixed, the one end lateral wall of visor articulates on has the handle, opens the visor through the handle.
In the invention, in the installation process, firstly, a protection box 4 is placed on a placing plate 3, four corners of the lower end of the placing plate 3 are all fixed with a sleeve 2, the lower end of the sleeve 2 is fixed on a bearing plate 1, when the protection box 4 presses downwards, a second pressure rod 19 in the sleeve 2 presses a pressure plate 20, the pressure plate 20 presses a second damping spring 18, the protection box 4 is damped under the action of the elastic force of the second damping spring 18, two protection boxes 14 are arranged on two transverse plates 15 in the protection box 4, the lower ends of the two protection boxes 14 move on a sliding chute 13 through a sliding block so as to be convenient for protecting a placing table in the protection boxes 14, connecting rods 9 are fixed on the two protection boxes 14, moving blocks 12 are fixed on the two connecting rods 9, the two moving blocks 12 are respectively positioned on a screw rod 11 with forward threads and a screw rod 11 with reverse threads, and by rotating a rotating wheel 5, the screw rod 11 is moved to drive the two movable rods 12 to move in opposite directions, so that the two protection boxes 14 are closed, and the transformer on the placing table is protected.
The invention provides a method for testing insulation resistance of a transformer, aiming at a double-insulation transformer, which can effectively detect the centralized defects of the whole insulation damp of the transformer, the damp or dirty surface of a component and the penetrability, such as: the insulator is broken, the lead is close to the shell, the inside of the transformer body has the defects of metal grounding, serious aging of winding apron, serious moisture of insulating oil and the like. The double-insulation transformer is non-conductive equipment as insulation equipment, but based on the existing process, absolute non-conductivity cannot be achieved, and weak current flows in a dielectric medium under the action of direct-current voltage. The weak actual current in the dielectric is the capacitance current i, depending on the nature, composition and structure of the dielectric material1Sink current i2And leakage current i3And (4) forming.
A double-insulated transformer is connected in series with an ammeter, a switch and a direct current power supply to measure a capacitance current i1Sink current i2And leakage current i3Value of (d), capacitance current i1The direct current voltage U acts on the double-insulation transformer and generates current instantly when being pressurized; sink current i2Current resulting from slow polarization and sandwich polarization; leakage current i3Is a constant current caused by the conductance of the medium; actual current i ═ i1+i2+i3(ii) a FIG. 5 is a wiring diagram of a testing method for insulation resistance of a transformer according to an embodiment of the present invention; FIG. 6 is an equivalent circuit diagram and an absorption curve diagram of a dielectric insulation resistance in the testing method of the insulation resistance of the transformer according to the embodiment of the invention; the three currents add together the actual current in the dielectric, and this current curve is called the absorption curve. The absolute resistance is the ratio of the DC voltage to the leakage current applied to the double-insulated transformer, i.e. R ═ u/i3。
The insulation resistance of the double insulation transformer is measured by adopting a megohmmeter, the insulation value is gradually increased along with the time due to the influence of the medium absorbed current, and the value or the stable value of 60S after the direct-current voltage is applied is usually read as the insulation resistance value in engineering. Due to i3Depending on the condition of the insulating material, i when the medium is wetted, aged, soiled or otherwise defective3Increases and decreases R, so measuring insulation resistance is one of the simplest and most common means of knowing the insulation of electrical equipment.
For small and medium-sized transformers, the absorption phenomenon is weaker, and the insulation condition can be judged according to the change of the absorption ratio, wherein the absorption ratio is the ratio of the 60S insulation resistance value to the 15S insulation resistance value.
For a large transformer, the absorption ratio is not enough to reflect the whole process of absorption, the insulation resistance ratio for a long time is adopted, and the insulation polarization index is adopted to judge the insulation condition, namely the ratio of the insulation resistance of 10min to the insulation resistance of 1 min.
And selecting a megohmmeter with corresponding specification for the specification of different double-insulation transformers. As shown in the following table:
the foregoing is merely exemplary and illustrative of the present invention and various modifications, additions and substitutions may be made by those skilled in the art to the specific embodiments described without departing from the scope of the present invention as defined in the accompanying claims.
Claims (9)
1. A double-insulation transformer is characterized by comprising 2 bearing plates, wherein sleeves are arranged on two sides of the upper ends of the bearing plates; a first auxiliary damping device is arranged in the sleeve;
the upper ends of the sleeves are jointly fixed with a placing plate; a protection box is arranged above the placing plate;
two transverse plates are fixed on opposite side walls in the protection box, two sliding grooves are formed in the two transverse plates, two sliding blocks are installed in the two sliding grooves, the two sliding blocks on the same side form a group, a protection box is fixed at the upper ends of the two sliding blocks in the same group, the lower ends of the two protection boxes move on the sliding grooves through the sliding blocks, connecting rods are fixed on the two protection boxes, moving blocks are fixed on the two connecting rods, the two moving blocks are located on a screw rod with a forward thread and a screw rod with a reverse thread respectively, and the screw rods move by rotating a rotating wheel, so that the two moving rods are driven to move in opposite directions;
a bearing table with a cavity is fixed between the 2 bearing plates; a second auxiliary damping device is arranged in the cavity;
the protection device comprises two protection boxes, wherein opposite side walls of the two protection boxes are provided with openings, a placing table is arranged between the two protection boxes, fixed blocks are fixed on the side walls of one sides of the two protection boxes, bolts are arranged on the two fixed blocks, two first threaded through holes are arranged on the side walls of one sides of the fixed blocks, second threaded through holes corresponding to the first threaded through holes are arranged on the side walls of the protection boxes, the two bolts penetrate through the first threaded through holes and extend into the second threaded through holes, a connecting rod is fixed between the two bolts, one end of the connecting rod is fixed on the side walls of the fixed blocks, the other ends of the two connecting rods are fixed with moving blocks, two lead screws are arranged on the opposite side walls in the protection boxes, and the; a screw rod penetrates through the side wall of one side of the protection box, one end of each screw rod is rotatably connected to the side wall of one end of the rubber layer, and a rotating wheel is fixed at one end of each of the two screw rods; the protection box is characterized in that a third thread through hole is formed in the side wall of one side of the protection box, the two screw rods penetrate through the third thread through hole and extend into the protection box, forward threads and reverse threads are arranged on the screw rods, fifth thread through holes are formed in the two moving blocks, the screw rods penetrate through the fifth thread through holes, one of the moving blocks is located on the screw rod of the forward threads, and the other moving block is located on the screw rod of the reverse threads.
2. The double-insulated transformer of claim 1, wherein the first auxiliary damping device comprises a sleeve fixed on the loading board, a second damping spring is fixed on a side wall of one end inside the sleeve, a pressing board is fixed on an upper end of the second damping spring, a second pressing rod is fixed on the pressing board, and an upper end of the second pressing rod is fixed on a lower end of the loading board.
3. A transformer according to claim 1, wherein said second auxiliary damping means comprises a fixing plate disposed on the opposite side walls in the cavity, 2 support rods for fixing the lower end of the placing plate; the utility model discloses a damping device, including bearing platform, bracing piece, fixed plate, first depression bar, first damping spring's upper end, bracing piece one end runs through the plummer and extends to in the cavity, the lower extreme of bracing piece is fixed with first depression bar, first depression bar runs through the fixed plate and extends to the lower extreme of fixed plate, the cover is equipped with first damping spring on the first depression bar, the lower extreme at the bracing piece is fixed to first damping spring's upper end, the upper end at the.
4. A double insulated transformer as claimed in claim 1, wherein a protective cover is hinged to one side of said protective box, and a rubber layer is coated on a peripheral side wall inside said protective box.
5. A double insulated transformer according to claim 1, characterized in that one end of said sleeve is a closed cylinder, and the closed end of said sleeve is fixed to the upper end of the loading plate.
6. A double insulated transformer according to claim 1, characterized in that the protective box and the protective box are made of stainless steel.
7. A double-insulation transformer according to claim 4, wherein a buckle is fixed on one side wall of the protection cover, a slot corresponding to the buckle is fixed on the side wall of the protection box, and a handle is hinged on one side wall of the protection cover.
8. A method for testing insulation resistance of a transformer is characterized by comprising the following steps:
s1: a double-insulated transformer is connected in series with an ammeter, a switch and a direct current power supply to measure a capacitance current i1Sink current i2And leakage current i3A value of (d); the capacitance current i1The current is generated at the moment of pressurization for the direct-current voltage U acting on the double-insulation transformer; the absorption current i2Current resulting from slow polarization and sandwich polarization; the leakage current i3Is a constant current caused by the conductance of the medium; actual current i ═ i1+i2+i3；
S2: measuring the insulation resistance of the double insulation transformer by using a megohmmeter, and reading the value or stable value of 60S after the direct-current voltage is applied as the insulation resistance value; and judging the insulation condition of the transformer by calculating the absorption ratio or the polarization index.
9. The method for testing the insulation resistance of the transformer according to claim 8, wherein the insulation condition of the transformer is judged by adopting an absorption ratio for small and medium-sized transformers; the absorption ratio is a ratio of a 60S insulation resistance value and a 15S insulation resistance value;
describing the process of insulation absorption by adopting polarization indexes for a large transformer; the polarization index is the ratio of the insulation resistance of 10min to the insulation resistance of 1 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN1127361A (en) * | 1995-01-20 | 1996-07-24 | 刘志万 | Insulativity testing method for electric power equipment |
| CN108536307A (en) * | 2018-04-16 | 2018-09-14 | 日照职业技术学院 | A kind of portable computer input device |
| CN208131476U (en) * | 2018-01-27 | 2018-11-23 | 威海卓锐羽绒制品股份有限公司 | A kind of stable supporting device of five casees wool ranking machines |
| CN208175185U (en) * | 2018-03-17 | 2018-11-30 | 孙赵辰 | A kind of novel computer management company host storage and managenent device |
| CN208290575U (en) * | 2018-05-04 | 2018-12-28 | 常州雅得印刷有限公司 | A kind of regulating device suitable for packing box production |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106787491B (en) * | 2016-12-23 | 2019-02-12 | 江苏未来智慧信息科技有限公司 | A kind of power distribution station stator core in motor intelligence cleaning robot |
| CN208753106U (en) * | 2018-10-23 | 2019-04-16 | 成都华变电气有限公司 | A kind of transformer of shock-absorption air bag type |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1127361A (en) * | 1995-01-20 | 1996-07-24 | 刘志万 | Insulativity testing method for electric power equipment |
| CN208131476U (en) * | 2018-01-27 | 2018-11-23 | 威海卓锐羽绒制品股份有限公司 | A kind of stable supporting device of five casees wool ranking machines |
| CN208175185U (en) * | 2018-03-17 | 2018-11-30 | 孙赵辰 | A kind of novel computer management company host storage and managenent device |
| CN108536307A (en) * | 2018-04-16 | 2018-09-14 | 日照职业技术学院 | A kind of portable computer input device |
| CN208290575U (en) * | 2018-05-04 | 2018-12-28 | 常州雅得印刷有限公司 | A kind of regulating device suitable for packing box production |
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