CN111443242B - Auxiliary device for direct-current volume resistivity test of composite insulator core rod - Google Patents
Auxiliary device for direct-current volume resistivity test of composite insulator core rod Download PDFInfo
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- CN111443242B CN111443242B CN201910044813.3A CN201910044813A CN111443242B CN 111443242 B CN111443242 B CN 111443242B CN 201910044813 A CN201910044813 A CN 201910044813A CN 111443242 B CN111443242 B CN 111443242B
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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Abstract
The invention discloses an auxiliary device for a core rod direct current volume resistivity test of a composite insulator, which comprises a base, a heating hearth, a first support and a second support, wherein a heating furnace bottom plate is arranged on the base; the heating hearth can be arranged on the base in an opening and closing manner; the first support is arranged on a bottom plate of the heating furnace, and an upper electrode is assembled on the first support; the second bracket is arranged on the heating furnace bottom plate, and a lower electrode is assembled on the second bracket; when the heating hearth is in a closed state, the heating hearth is buckled on a heating furnace bottom plate, the heating hearth and the heating furnace bottom plate enclose a test cavity, and the upper electrode and the lower electrode are respectively positioned in the test cavity; when the heating hearth is in an open state, the heating hearth is separated from the heating furnace bottom plate. The core rod direct-current volume resistivity test auxiliary device of the composite insulator is provided with a first support and a second support, and an electrode can be installed in a test cavity.
Description
Technical Field
The invention relates to the technical field of mechanical industry, in particular to an auxiliary device for a core rod direct-current volume resistivity test of a composite insulator.
Background
The composite insulator is used in an overhead transmission line and plays a role in supporting a lead and preventing current from flowing back to the ground.
The insulation performance of the core rod in the composite insulator has an important influence on the electrical performance of a composite insulator product, the volume resistivity of the core rod is required to be tested in corresponding standards DL/T810-2012, DL/T1580-.
In view of the above, it is an urgent need for those skilled in the art to provide an auxiliary device for testing the volume resistivity of a mandrel to which an electrode can be attached.
Disclosure of Invention
In view of this, the invention provides an auxiliary device for testing direct current volume resistivity of a core rod of a composite insulator, which comprises a bracket and can install an electrode in a cavity.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a compound insulator's experimental auxiliary device of plug direct current volume resistivity, includes:
the heating furnace comprises a base, wherein a heating furnace bottom plate is arranged on the base;
the heating hearth can be arranged on the base in an opening and closing manner;
the first support is arranged on the heating furnace bottom plate, and an upper electrode is assembled on the first support;
the second support is arranged on the heating furnace bottom plate, and a lower electrode is assembled on the second support;
when the heating hearth is in a closed state, the heating hearth is buckled on the heating furnace bottom plate, the heating hearth and the heating furnace bottom plate form a test cavity in an enclosing mode, and the upper electrode and the lower electrode are respectively located in the test cavity; and when the heating furnace is in an open state, the heating furnace hearth is separated from the heating furnace bottom plate.
Preferably, in the mandrel direct-current volume resistivity test auxiliary device, an operation panel is arranged on the upper surface of the base, a hollow structure is arranged on the operation panel, and the heating furnace bottom plate is arranged on the operation panel in a suspended manner through an outward extending pad and is located above the hollow structure.
Preferably, in the above mandrel direct-current volume resistivity test auxiliary device, an anti-scald slot is formed in the edge of the operation panel.
Preferably, in the mandrel straight-flow volume resistivity test auxiliary device, the heating furnace is provided with a heating wire;
the heating furnace is characterized by further comprising a temperature sensor arranged on the inner wall of the top of the heating furnace and a temperature controller arranged inside the base, wherein the temperature controller is used for controlling the current of the heating wire according to the temperature measurement result of the temperature sensor.
Preferably, in the auxiliary device for testing direct-current volume resistivity of the mandrel, the temperature controller is connected with a temperature control instrument fixed on the outer surface of the base, and the temperature control instrument is used for collecting a temperature rise rate signal, a highest temperature signal and a heat preservation time signal input by a user.
Preferably, in the mandrel direct-flow volume resistivity test auxiliary device, the heating furnace comprises an inner wall, a middle high-temperature-resistant layer, a heat-insulating layer and a shell which are sequentially arranged from inside to outside; the heating wire is arranged on the inner wall.
Preferably, in the above mandrel direct current volume resistivity test auxiliary device, a height of at least one of the upper electrode and the lower electrode is adjustable.
Preferably, in the apparatus for assisting a mandrel straight-flow volume resistivity test, the first support includes:
the high-voltage insulating sleeve is fixed on the heating furnace base, is hollow and is used for arranging a high-voltage cable lead led out from the base;
the upper electrode connecting rod is electrically connected with the upper electrode and is arranged on the high-voltage insulating sleeve; the high-voltage cable lead is electrically connected with the upper electrode connecting rod.
Preferably, in the mandrel direct-current volume resistivity test auxiliary device, the upper electrode connecting rod is inserted into the insertion hole of the high-voltage insulating sleeve, and the height of the upper electrode connecting rod in the vertical direction is adjustable;
a carbon brush connected with the high-voltage cable lead is arranged in the high-voltage insulating sleeve, and the carbon brush is positioned on the inner wall of the insertion hole;
and the first elastic piece is respectively abutted against the carbon brush and the high-voltage insulating sleeve and is used for applying a driving force towards the axis of the insertion hole to the carbon brush.
Preferably, in the mandrel direct current volume resistivity test auxiliary device,
the second bracket includes:
the ceramic fixed guide rail is fixed on the heating furnace bottom plate, and a guide hole is formed in the middle of the ceramic fixed guide rail;
the lower electrode connecting rod is slidably arranged in the guide hole, and the upper end of the lower electrode connecting rod is fixedly connected with the lower electrode; the lower end of the lower electrode connecting rod is connected with a grounding wire led out from the base and is connected with a lead of the current collecting module;
a second elastic member sandwiched between the lower electrode and the ceramic stationary rail and adapted to apply an upward force to the lower electrode.
Preferably, in the device for testing direct current volume resistivity of the mandrel, a current collecting and protecting circuit is arranged in the base and connected with the lower electrode.
Preferably, in the mandrel direct current volume resistivity test auxiliary device, a shield electrode grounding column is fixed to the heating furnace bottom plate.
Preferably, in the mandrel straight flow volume resistivity test auxiliary device, the heating furnace is provided on the base so as to be openable and closable by a drive mechanism.
The invention provides an auxiliary device for a core rod direct current volume resistivity test of a composite insulator, which comprises a base, a heating hearth, a first support and a second support, wherein a heating furnace bottom plate is arranged on the base; the heating hearth can be arranged on the base in an opening and closing manner; the first support is arranged on a bottom plate of the heating furnace, and an upper electrode is assembled on the first support; the second bracket is arranged on the heating furnace bottom plate, and a lower electrode is assembled on the second bracket; when the heating hearth is in a closed state, the heating hearth is buckled on a heating furnace bottom plate, the heating hearth and the heating furnace bottom plate enclose a test cavity, and the upper electrode and the lower electrode are respectively positioned in the test cavity; when the heating hearth is in an open state, the heating hearth is separated from the heating furnace bottom plate.
The core rod direct-current volume resistivity test auxiliary device of the composite insulator is provided with the first support and the second support, and an electrode can be installed in a test cavity.
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 is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic view of a main structure of a direct-current volume resistivity test auxiliary device for a core rod of a composite insulator according to an embodiment of the present invention;
fig. 2 is a schematic side view of a core rod dc volume resistivity test auxiliary device of a composite insulator according to an embodiment of the present invention;
FIG. 3 is an assembly view of an upper electrode, a lower electrode and a core rod sample provided in accordance with an embodiment of the present invention;
fig. 4 is an assembly view of the upper electrode connecting rod 9 and the high voltage insulating bushing according to the embodiment of the present invention;
fig. 5 is a schematic diagram of a current collection protection circuit according to an embodiment of the present invention;
wherein, in fig. 1-4:
1. heating the hearth; 2. an upper electrode; 3. a shield electrode ground post; 4. a temperature control instrument; 5. an operation panel; 6. heating a furnace floor; 7. a high voltage insulating bushing; 8. adjusting the bolt; 9. an upper electrode connecting rod; 10. core rod test samples; 11. a lower electrode; 12. a temperature sensor; 13. a drive mechanism; 14. a lower electrode connecting rod; 15. a second elastic member; 16. fixing a guide rail by ceramics; 17. a sealing plug; 18. fixing the screw rod; 19. a first elastic member; 20. a carbon brush.
Detailed Description
The embodiment of the invention discloses an auxiliary device for a direct-current volume resistivity test of a core rod of a composite insulator, which is provided with a support, and an electrode can be arranged in a cavity.
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.
Referring to fig. 1 to 5, an embodiment of the invention provides an auxiliary device for a direct current volume resistivity test of a core rod of a composite insulator, which includes a base, a heating furnace 1, a first bracket and a second bracket, wherein a heating furnace bottom plate is arranged on the base; the heating hearth 1 is arranged on the base in an opening and closing manner; the first bracket is arranged on a heating furnace bottom plate 6, and the first bracket is provided with an upper electrode 2; the second bracket is arranged on the heating furnace bottom plate 6, and a lower electrode 11 is assembled on the second bracket; when the heating hearth 1 is in a closed state, the heating hearth 1 is buckled with the heating furnace bottom plate 6, the heating hearth and the heating furnace bottom plate enclose a test cavity, and the upper electrode 2 and the lower electrode 11 are respectively positioned in the test cavity; when the heating hearth 1 is in an open state, the heating hearth 1 is separated from the heating furnace bottom plate 6.
The auxiliary device for the direct-current volume resistivity test of the core rod of the composite insulator is provided with the first support and the second support, and an electrode can be installed in a test cavity.
Specifically, in the mandrel direct-current volume resistivity test auxiliary device provided in the above embodiment, the heating furnace 1 is provided with a heating wire; in order to control the temperature in the test cavity conveniently, the mandrel direct-current volume resistivity test auxiliary device further comprises a temperature sensor 12 arranged on the inner wall of the top of the heating hearth 1 and a temperature controller arranged inside the base, wherein the temperature controller is used for controlling the current of the heating wire according to the temperature measurement result of the temperature sensor 12.
Furthermore, the temperature controller is connected with a temperature control instrument 4 fixed on the outer surface of the base, and the temperature control instrument 4 is used for collecting a heating rate signal, a highest temperature signal and a heat preservation time signal input by a user.
As can be understood by those skilled in the art, the volume resistivity tests for the core rods in the standards DL/T810-2012, DL/T1580-2016, GB/T34937-2017 and GB/T1410-2006 are as follows: 5 core rod samples with the length of (10 +/-0.5) mm are tested for 96 hours continuously after the test temperature is increased from room temperature to 140 ℃ and the temperature rising speed is not more than 20 ℃/h and the temperature reaches 140 ℃ under the test voltage of +6kV, the current flowing through the samples is continuously monitored, the power supply is not interrupted during the test, the temperature control instrument is arranged in the device provided by the embodiment, so that a user can conveniently set the heating rate, the maximum temperature and the heat preservation time according to the test requirement, a temperature controller can conveniently set the temperature control instrument according to the collected heating rate signal, the collected maximum temperature signal and the collected heat preservation time signal, and the temperature measurement result of the temperature sensor 12 adjusts the current of the heating wire to ensure that the temperature of the test cavity is raised to 140 ℃ at the speed of not more than 20 ℃/h, and then keeping the temperature at 140 ℃ for 96h to ensure that the test conditions meet the test requirement regulations of various standards and ensure that the test result is accurate. The temperature controller adopts PID adjustment to control the temperature in the test cavity.
Specifically, in the mandrel direct-current volume resistivity test auxiliary device provided in the above embodiment, the heating furnace 1 is barrel-shaped, preferably, is barrel-shaped, so as to match the shape of the mandrel sample 10 used for testing, thereby saving the furnace space and reducing the cost. The heating hearth 1 comprises an inner wall, a middle high temperature resistant layer, a heat preservation layer and a shell which are sequentially arranged from inside to outside; the heating wires are arranged on the inner wall, particularly on the annular side surface of the inner wall, and form coils which are uniformly distributed along the axial direction so as to uniformly heat the test cavity, and the heating wires are resistance wires; the combined action of the middle high-temperature-resistant layer and the heat-insulating layer can insulate the test cavity, prevent operators from being accidentally injured, and the middle high-temperature-resistant layer is a mullite layer and the heat-insulating layer is a fiber heat-insulating layer. The top surface of the shell is provided with a heat dissipation hole, and the heat dissipation hole is circular in shape and used for dissipating heat of a high-temperature part and ensuring the uniform temperature in the test cavity.
In the mandrel dc volume resistivity test auxiliary device provided in the above embodiment, the upper electrode 2 and the lower electrode 11 may be configured to be fixed on the first support and the second support, respectively, but for facilitating the assembly and disassembly of the mandrel sample 10, the upper electrode 2 and the lower electrode 11 are preferably configured to have at least one of the heights thereof adjustable.
In the apparatus for assisting direct-current volume resistivity test of a mandrel provided in the above embodiment, the first support includes:
the high-voltage insulating sleeve 7 is fixed on the heating furnace bottom plate 6, is hollow and is used for arranging a high-voltage cable lead led out from the base;
the upper electrode connecting rod 9 is electrically connected with the upper electrode 2, and the upper electrode connecting rod 9 is arranged on the high-voltage insulating sleeve; the high voltage cable lead is electrically connected to the upper electrode connecting rod 9.
Among the technical scheme that this embodiment provided, 7 cavitys of high voltage insulation sleeve are used for being provided with the high tension cable lead wire of being drawn forth by the base, need not to set up the lead wire opening on heating furnace 1, ensure that the heat preservation is complete to avoid producing because of the heat preservation trompil produces the problem that temperature distribution is inhomogeneous, whole thermal insulation performance is poor, prevent that it from producing harmful effects to the accuracy of test result in long-time heating process.
On the basis of the structure of the first support, the upper electrode 2 can be set to be height-adjustable, specifically as follows:
the upper electrode connecting rod 9 is arranged to be inserted into an insertion hole of the high-voltage insulating sleeve 7, the height of the upper electrode connecting rod 9 in the vertical direction is adjustable, namely the position of the upper electrode connecting rod 9 in the insertion hole is adjustable, and the height of the upper electrode 2 in the vertical direction is changed in the adjusting process;
a carbon brush 20 connected with a high-voltage cable lead is arranged in the high-voltage insulating sleeve, and the carbon brush 20 is positioned on the inner wall of the insertion hole; the carbon brush 20 can slide in the high-voltage insulating sleeve 7 along the direction perpendicular to the axial direction of the insertion hole;
the first elastic piece 19 is abutted against the carbon brush 20 and the high-voltage insulating sleeve 7 respectively, and is used for applying driving force towards the axis of the insertion hole to the carbon brush 20; the first elastic element 19 prevents the carbon brush 20 from sliding in the sleeve along the direction perpendicular to the axial direction of the insertion hole, so that the upper electrode connecting rod 9 can move up and down in the high-voltage insulating sleeve 7, and the head of the carbon brush 20 is ensured to be in close contact with the upper electrode connecting rod 9.
In use, the first elastic member 19 drives the carbon brush 20 to press the upper electrode connecting rod 9 and provide a frictional force to the upper electrode connecting rod 9, so that the upper electrode connecting rod 9 is positioned in the insertion hole. The contact surface of the head of the carbon brush 20 with the upper electrode connecting rod 9 is preferably set to an arc surface matching the shape of the side surface of the upper electrode connecting rod 9. The upper electrode connecting rod 9 is preferably screwed to the upper electrode 2 to replace the upper electrode 2 of a different size and shape.
The number of the carbon brushes 20 may be two, the two carbon brushes are distributed on two opposite sides of the upper electrode connecting rod 9, and the two first elastic pieces 19 are respectively matched with the two carbon brushes 20. The first elastic pieces 19 are arranged as springs, so that in order to adjust the driving force of the springs on the carbon brush 20, the high-voltage insulating sleeve 7 is provided with adjusting bolts 8, one of the first springs 19 abuts against the adjusting bolt and the carbon brush 20 respectively, when the adjusting bolts are tightened, the springs are compressed and provide larger driving force for the carbon brush 20, the friction force between the carbon brush 20 and the upper electrode connecting rod 9 is increased, and the upper electrode connecting rod 9 is ensured to be reliably positioned; when the adjusting bolt is unscrewed, the spring extends, the driving force provided for the carbon brush 20 is reduced, the friction force between the carbon brush 20 and the upper electrode connecting rod 9 is reduced, and the user can conveniently adjust the position of the upper electrode connecting rod 9 in the insertion hole. After the adjusting bolt 8 is removed, the carbon brush 20 and the spring installed in the high-voltage insulating bushing 7 can be replaced, which is convenient for maintenance.
Specifically, in the mandrel direct-current volume resistivity test auxiliary device provided in the foregoing embodiment, the second support includes:
the ceramic fixed guide rail 16 is fixed on the heating furnace bottom plate 6, and a guide hole is formed in the middle of the ceramic fixed guide rail 16;
the ceramic fixed guide rail 16 is preferably made of high-strength insulating and heat-insulating ceramic; the bottom of the ceramic fixed guide rail 16 is of a disc-shaped structure, is provided with a unthreaded hole and is fixed on the back of the heating furnace bottom plate 6 through a screw, and a sealing gasket is arranged between the ceramic fixed guide rail 16 and the heating furnace bottom plate 6 so as to improve the sealing property of the bottom of the test cavity; the upper end of the ceramic fixed guide rail 16 extends out of the heating furnace bottom plate 6, and a certain height difference is formed between the ceramic fixed guide rail and the heating furnace bottom plate 6;
a lower electrode connecting rod 14, wherein the lower electrode connecting rod 14 is slidably arranged in the guide hole, and the upper end of the lower electrode connecting rod 14 is fixedly connected with the lower electrode 11; the lower end of the lower electrode connecting rod 14 is connected with a grounding wire led out from the inside of the base and is connected with a lead of the current collecting module;
the lower electrode connecting rod 14 is in threaded connection with the lower electrode 11 so as to replace the lower electrode 11; the lower end of the lower electrode connecting rod 14 extends to the back of the heating furnace bottom plate 6, the outermost end of the lower electrode connecting rod is provided with an inner screw hole, a grounding wire and a lead of a current acquisition module are fixed on the lower electrode connecting rod 14 through installing a fixing screw 18, and the lower electrode connecting rod 14 is prevented from falling out of a guide hole and entering a test cavity;
and a second elastic member 15, the second elastic member 15 being sandwiched between the lower electrode 11 and the ceramic fixed rail 16, and being configured to apply an upward force to the lower electrode 11, so that the lower electrode 11 is pressed against the core rod sample 10.
Further, a sealing plug 17 is arranged at the bottom end of the lower electrode connecting rod 14, the sealing plug 17 is wrapped on a fixing screw 18, the inner wall of the ceramic fixing guide rail 16 is smooth, the lower electrode 11 is pulled upwards through the elasticity of the second elastic piece 15, the sealing plug 17 can move up and down in the inner wall of the ceramic fixing guide rail 16, the sealing plug is similar to a piston sealing mode of an injection needle cylinder, the tail end of the lower electrode 11 is sealed, and the sealing performance of the whole test chamber is guaranteed.
Be equipped with current acquisition protection circuit in the base, this current acquisition protection circuit links to each other with the bottom electrode, specifically lies in between the current acquisition lead-out wire that directly links to each other with bottom electrode 11 and current output BNC for the current acquisition module of protection and current output end connection causes the damage to test system when overflowing. The current acquisition protection circuit consists of a protection resistor R1, a sampling resistor R2, an OC optical coupler and a normally closed relay and is used for ensuring the impact of instantaneous overvoltage and overcurrent on the current acquisition module. The principle of the current collection protection circuit is shown in fig. 5, when the current flowing out from the low-voltage end of the core rod sample 10 exceeds a certain value, the OC optical coupler connected in series with the collection resistor R2 works in an induction manner to control the normally closed relay connected with the current collection module, the normally closed relay is opened at the moment, the current in the loop is directly grounded and is not output to the current collection testing device connected with the core rod direct-current volume resistivity test auxiliary device (the current collection module is located in the current collection testing device), so that the impact of instantaneous overvoltage and overcurrent on the current collection module is ensured.
In the mandrel direct current volume resistivity test auxiliary device, a shielding electrode grounding column 3 is fixed on a heating furnace bottom plate 6 and is used for grounding a shielding electrode arranged on a mandrel sample 10.
Preferably, in the mandrel direct current volume resistivity test auxiliary device provided by the above embodiment, the upper surface of the base is provided with the operation panel 5, the operation panel 5 is provided with the hollow structure, the heating furnace bottom plate 6 is arranged on the operation panel 5 in a suspension manner through the overhanging pad foot, and the heating furnace bottom plate 6 is arranged above the hollow structure, namely, the heating furnace bottom plate 6 is separated from the operation panel 5 through the overhanging pad foot, the heat transfer from the heating furnace 1 to the operation panel 5 can be reduced, the operation panel 5 and the base are prevented from being heated, the stability of other electrical components is prevented from being influenced, and the test operator can be prevented from touching the operation panel 5 and being scalded. The heating furnace bottom plate 6 is provided with a high-temperature fluorine rubber sealing ring which plays a sealing role when the heating furnace hearth 1 falls down and is closed so as to ensure the temperature stability of the whole heating furnace. The periphery of the heating furnace bottom plate 6 is of a circular ring structure, and the middle part of the heating furnace bottom plate is a circular metal plate.
The operation panel 5 is arranged on the base, and the part of the middle of the operation panel corresponding to the heating furnace bottom plate 6 is of a circular hollow structure. The size of the operation panel 5 is larger than that of the base; 5 borders of operating panel have prevents scalding fluting, and its function separates panel outermost edge and panel middle part, can avoid the temperature on the panel to transmit above-mentioned border, avoids scalding when protection testing personnel touches 5 borders of operating panel.
The heating furnace 1 is provided on the base so as to be openable and closable by a drive mechanism 13. Specifically, one end of the operation panel 5 is provided with a fixed bracket, a movable shaft is fixed on the heating hearth 1, and the movable shaft can be rotatably arranged on the fixed bracket around the axis of the movable shaft; the driving mechanism comprises an electric opening and closing assembly and an interlocking switch, wherein the electric opening and closing assembly comprises a direct current motor, a speed reducer and the movable shaft. The working mode is that the direct current motor is matched with the rotation of the speed reducer to drive the movable shaft to rotate, the movable shaft drives the heating furnace 1 to open and close, the opening and closing are convenient, after the heating furnace 1 rotates and rises, the support and the test sample are installed at the heating furnace bottom plate 6, the operation space is large, and the installation and operation of the personnel are convenient. In this scheme, the interlock switch sets up in actuating mechanism, and only when furnace falls automatically, just can exert voltage to the plug sample 10 of placing in the test cavity to guarantee tester's safety.
The base is the bearing structure of whole device, and each operating switch and temperature-sensing meter all install in the front of base, and temperature control system's temperature controller and electric mechanism 13's that opens and shuts power device (including direct current motor and speed reducer) all set up inside the base. The opening and closing switches of the temperature control instrument 4 and the heating hearth 1 are arranged on the same side and are arranged on the front side of the base of the test platform. The power switch, the power jack, the voltage input interface, the current output interface and the grounding column are arranged on the back of the test platform base. And the grounding wire and the current acquisition lead are connected inside the base and are respectively connected with the lower electrode 11, the grounding column and the current output port. The upper electrode, the lower electrode and the connecting rod thereof are made of H62 brass. Wherein the high-voltage insulating sleeve 7 is a polytetrafluoroethylene high-voltage insulating sleeve and is fixed on the heating furnace bottom plate 6.
The outer wall of the heating hearth 1 and the heating furnace bottom plate 6 are made of stainless steel plates, and when the heating hearth 1 is closed and high-pressure test is carried out, the heating furnace formed by the heating hearth 1 and the heating furnace bottom plate 6 is equivalent to a shielding box, so that interference caused by external interference on the accuracy of test data can be prevented.
The bracket system composed of the first bracket and the second bracket reduces the use of high-voltage wires, and adopts a design mode that the high-voltage insulating sleeve 7, the conductive carbon brush 20 and the lower electrode 11 lead are led out of the heating furnace. The purpose of this kind of design mode is in order to reduce the interference that internal factor caused in the experimentation to improve the accuracy of experimental data.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (11)
1. The utility model provides a compound insulator's experimental auxiliary device of plug direct current volume resistivity which characterized in that includes:
the heating furnace comprises a base, wherein a heating furnace bottom plate is arranged on the base;
the heating hearth can be arranged on the base in an opening and closing manner;
the first support is arranged on the heating furnace bottom plate, and an upper electrode is assembled on the first support;
the second support is arranged on the heating furnace bottom plate, and a lower electrode is assembled on the second support;
when the heating hearth is in a closed state, the heating hearth is buckled on the heating furnace bottom plate, the heating hearth and the heating furnace bottom plate form a test cavity in an enclosing mode, and the upper electrode and the lower electrode are respectively located in the test cavity; when the heating furnace is in an open state, the heating furnace hearth is separated from the heating furnace bottom plate;
the first bracket includes:
the high-voltage insulating sleeve is fixed on the heating furnace bottom plate, is hollow and is used for arranging a high-voltage cable lead led out from the base;
the upper electrode connecting rod is electrically connected with the upper electrode and is arranged on the high-voltage insulating sleeve; the high-voltage cable lead is electrically connected with the upper electrode connecting rod;
the second bracket includes:
the ceramic fixed guide rail is fixed on the heating furnace bottom plate, and a guide hole is formed in the middle of the ceramic fixed guide rail;
the lower electrode connecting rod is slidably arranged in the guide hole, and the upper end of the lower electrode connecting rod is fixedly connected with the lower electrode; the lower end of the lower electrode connecting rod is connected with a grounding wire led out from the base and is connected with a lead of the current collecting module;
a second elastic member sandwiched between the lower electrode and the ceramic stationary rail and adapted to apply an upward force to the lower electrode.
2. The mandrel direct-current volume resistivity test auxiliary device according to claim 1, wherein an operation panel is arranged on the upper surface of the base, a hollow structure is arranged on the operation panel, and the heating furnace bottom plate is arranged on the operation panel in a suspended mode through an overhanging foot rest and is located above the hollow structure.
3. The mandrel direct current volume resistivity test auxiliary device according to claim 2, wherein the edge of the operation panel is provided with an anti-burn slot.
4. The mandrel direct current volume resistivity test auxiliary device according to claim 1, wherein the heating hearth is provided with heating wires;
the heating furnace is characterized by further comprising a temperature sensor arranged on the inner wall of the top of the heating furnace and a temperature controller arranged inside the base, wherein the temperature controller is used for controlling the current of the heating wire according to the temperature measurement result of the temperature sensor.
5. The mandrel direct-current volume resistivity test auxiliary device according to claim 4, wherein the temperature controller is connected with a temperature control instrument fixed on the outer surface of the base, and the temperature control instrument is used for collecting a temperature rise rate signal, a maximum temperature signal and a heat preservation time signal which are input by a user.
6. The mandrel direct-current volume resistivity test auxiliary device according to claim 4, wherein the heating hearth comprises an inner wall, a middle high-temperature-resistant layer, an insulating layer and an outer shell which are sequentially arranged from inside to outside; the heating wire is arranged on the inner wall.
7. The mandrel dc volume resistivity test aid of claim 1, wherein a height of at least one of the upper electrode and the lower electrode is adjustable.
8. The mandrel direct-current volume resistivity test auxiliary device according to claim 7, wherein the upper electrode connecting rod is inserted into the insertion hole of the high-voltage insulating sleeve, and the height of the upper electrode connecting rod in the vertical direction is adjustable;
a carbon brush connected with the high-voltage cable lead is arranged in the high-voltage insulating sleeve and is positioned on the inner wall of the insertion hole;
and the first elastic piece is respectively abutted against the carbon brush and the high-voltage insulating sleeve and is used for applying a driving force towards the axis of the insertion hole to the carbon brush.
9. The mandrel direct-current volume resistivity test auxiliary device according to claim 1, wherein a current collection protection circuit is arranged in the base and connected with the lower electrode.
10. The mandrel direct current volume resistivity test auxiliary device according to claim 1, wherein a shielding electrode grounding column is fixed on the heating furnace bottom plate.
11. The mandrel direct-current volume resistivity test auxiliary device according to claim 1, wherein the heating furnace is openably and closably provided on the base by a driving mechanism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910044813.3A CN111443242B (en) | 2019-01-17 | 2019-01-17 | Auxiliary device for direct-current volume resistivity test of composite insulator core rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910044813.3A CN111443242B (en) | 2019-01-17 | 2019-01-17 | Auxiliary device for direct-current volume resistivity test of composite insulator core rod |
Publications (2)
| Publication Number | Publication Date |
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| CN111443242A CN111443242A (en) | 2020-07-24 |
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