CN111487510A - Insulating pull rod characteristic testing device - Google Patents
Insulating pull rod characteristic testing device Download PDFInfo
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- CN111487510A CN111487510A CN201910080119.7A CN201910080119A CN111487510A CN 111487510 A CN111487510 A CN 111487510A CN 201910080119 A CN201910080119 A CN 201910080119A CN 111487510 A CN111487510 A CN 111487510A
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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
Abstract
The invention relates to an insulating pull rod characteristic testing device which comprises a closed air chamber with an observation window, a voltage loading piece and a grounding piece, wherein the voltage loading piece and the grounding piece are arranged in the closed air chamber or extend into the closed air chamber at opposite intervals so as to form an installation fracture in the closed air chamber, the voltage loading piece and the grounding piece are respectively provided with a connecting end used for being connected with an insulating pull rod to be tested at the installation fracture, and the testing device further comprises a force loading mechanism which is in transmission connection with the grounding piece so as to apply tensile force to the insulating pull rod to be tested through the grounding piece. The insulating pull rod that awaits measuring can receive voltage load and mechanical action's superposition simultaneously, and the mutual coupling influences between the two, and the experimental environment of the insulating pull rod that awaits measuring this moment is unanimous with the actual service environment of the insulating pull rod that awaits measuring, and the insulating properties of the insulating pull rod that awaits measuring who tests from this is close to actual conditions more, and the reliability is higher.
Description
Technical Field
The invention relates to the field of power transmission insulating equipment, in particular to an insulating pull rod characteristic testing device.
Background
When the insulating pull rod is used, the connecting lever and the moving contact part are connected, the driving force of the operating mechanism is transmitted, the moving contact part is driven to be switched on and off, and the insulating performance of the insulating pull rod plays a role in isolating the moving contact part from the operating mechanism. Therefore, the mechanical property and the insulating property of the insulating pull rod influence the normal on-off of the switch.
For example, the chinese patent application with application publication No. CN103353574A discloses an insulation test device for an insulation pull rod for a GIS, which specifically includes a cylindrical housing, wherein an upper support seat and a lower support seat are arranged in the housing at an interval from top to bottom, and a high-voltage contact conductor is further arranged in the housing.
Chinese utility model patent as the grant publication number CN206056943U discloses an insulating pull rod test device, this test device includes the bottom plate and installs circuit breaker operating mechanism, buffer on the bottom plate, during the test, with the both ends of the insulating pull rod that awaits measuring respectively with circuit breaker operating mechanism and buffer fixed connection, circuit breaker operating mechanism drives the insulating pull rod reciprocating motion that awaits measuring, the buffer provides the resistance when reciprocating motion, whether connect in the insulating pull rod that awaits measuring deciliter certain number of times with the insulator firm in connection.
From the above, the mechanical properties and the insulation properties of the insulating tie rod are separately tested in the prior art. Because the insulating pull rod can receive continuous effort when using, need guarantee specific insulating properties under the prerequisite of atress. However, at present, the insulation performance test of the insulation pull rod is completed in a static environment, the insulation pull rod is not subjected to other acting forces except gravity in the whole test process, the test environment is not consistent with the actual working environment of the insulation pull rod, and the measured insulation performance of the insulation pull rod has deviation with the insulation performance in the actual working process, so that the reliability of the test result is relatively low.
Disclosure of Invention
The invention aims to provide an insulation pull rod characteristic testing device for simultaneously carrying out voltage loading and acting force loading, and aims to solve the technical problem that the reliability of an insulation performance testing result of an insulation pull rod is low due to the fact that only voltage loading is carried out in the prior art.
In order to achieve the purpose, the technical scheme of the device for testing the characteristics of the insulated pull rod is as follows: the utility model provides an insulating pull rod characteristic test device, includes the closed air chamber that has the observation window, still includes and is in the closed air chamber or extends into the relative interval arrangement in the closed air chamber in order to form the voltage loading piece and the ground connection piece of installation fracture in the closed air chamber, voltage loading piece and ground connection piece have respectively and are used for being in the link that the insulating pull rod that awaits measuring of installation fracture department is connected, and test device still includes and is connected in order to exert tensile force load mechanism to the insulating pull rod that awaits measuring through the ground connection piece with the ground connection piece transmission.
The invention has the beneficial effects that: the invention provides an insulation pull rod characteristic testing device which comprises a closed air chamber, wherein a voltage loading piece and a grounding piece are arranged in the closed air chamber at intervals, or the voltage loading piece and the grounding piece extend into the closed air chamber, a mounting fracture is formed by the voltage loading piece and the grounding piece, and the testing device further comprises a force loading mechanism for applying tension to the grounding piece. During the use, install respectively on voltage loading piece and ground connection piece the both ends of the insulating pull rod that will await measuring, apply voltage in the insulating pull rod that awaits measuring through voltage loading piece, through power loading mechanism, the pulling force is applyed to the insulating pull rod that awaits measuring to ground connection piece, make the insulating pull rod that awaits measuring can receive voltage load and tensile superposition effect simultaneously, the intercoupling influences between the two, the experimental environment of the insulating pull rod that awaits measuring this moment is unanimous with the actual service environment of the insulating pull rod that awaits measuring, the insulating properties of the insulating pull rod that awaits measuring who tests from this is close to actual conditions more, the reliability is higher.
Furthermore, one end of the grounding piece, which is far away from the voltage loading piece, extends to the outside of the closed air chamber, and the force loading mechanism is positioned outside the closed air chamber and is in transmission connection with the corresponding end of the grounding piece. The arrangement of the force loading mechanism in the closed gas chamber can pollute the insulating gas in the closed gas chamber, generate metal particles harmful to an electric field and the like, and influence the insulation characteristic test.
Furthermore, the force loading mechanism is a hydraulic loading mechanism to continuously apply tension to the insulating pull rod to be tested. Adopt hydraulic pressure loading mechanism can continuously exert pressure to ground connection spare, be close to the in-service use operating mode more.
Furthermore, the testing device comprises a high-voltage sleeve fixedly arranged outside the closed air chamber and an electric connector arranged in the high-voltage sleeve, the voltage loading piece is a loading rod fixedly arranged on the electric connector in a split mode, the loading rod is provided with a corresponding connecting end extending into the closed air chamber and used for being connected with the insulating pull rod to be tested, and the loading rod is in conductive connection with the electric connector. The electric connector can be conveniently arranged by additionally arranging the high-voltage sleeve, the loading rod is arranged on the electric connector in a split mode, the loading rod can be replaced to complete testing aiming at the to-be-tested insulating pull rods with different specifications and parameters, and the universality is higher.
Furthermore, the electric connector is provided with a groove with a notch facing the grounding piece, the loading rod is assembled at the bottom of the groove in a threaded manner, and the groove wall of the groove is electrically connected with the outer peripheral surface of the loading rod through an electric connection contact finger. Set up the recess on the electric connector, be provided with electric connection contact finger between the cell wall of recess and the outer peripheral face of loading pole, can guarantee the stable electrically conductive continuous between electric connector and the loading pole through electric connection contact finger.
Furthermore, the testing device also comprises an electrostatic measuring device, the electrostatic measuring device comprises an electrostatic probe which is positioned in the closed air chamber and is used for measuring the surface potential of the insulating pull rod to be measured, and an electrometer which is connected with the electrostatic probe and is positioned outside the closed air chamber. The potential on the surface of the insulating pull rod to be measured after voltage loading can be measured by arranging the electrostatic measuring device, and the electrometer is positioned outside the closed air chamber, so that the pollution to the insulating gas in the closed air chamber is reduced as much as possible.
Furthermore, the static measuring device comprises a potential measuring rod with one end penetrating into the closed air chamber, the static probe is fixedly arranged at the end of the potential measuring rod, and the driving mechanism is positioned outside the closed air chamber and used for driving the potential measuring rod to reciprocate along the interval arrangement direction of the voltage loading piece and the grounding piece. When the device is used, the driving mechanism can drive the potential measuring rod and the electrostatic probe to reciprocate along the interval arrangement direction of the voltage loading piece and the grounding piece, and the multi-position potential of the insulating pull rod to be measured from the high-voltage side to the low-voltage side can be measured.
Furthermore, the voltage loading part and the grounding part are rotatably assembled on the closed air chamber along the axis of the voltage loading part and the grounding part, so that the circumferential potential measurement of the insulating pull rod to be measured is realized. The voltage loading piece and the grounding piece can drive the insulating piece to be tested to rotate around the axis of the voltage loading piece and the grounding piece, and potential measurement is carried out on all circumferential positions of the insulating piece to be tested.
Further, the testing device comprises an electric connector fixedly arranged on the closed air chamber, and the voltage loading piece is assembled on the electric connector in a threaded mode. The voltage loading piece is installed on the electric connector in a threaded assembly mode, so that firm connection between the voltage loading piece and the electric connector can be guaranteed, and rotation of the voltage loading piece is facilitated.
Furthermore, the testing device comprises a high-voltage bushing fixedly arranged outside the closed air chamber, the electric connector is arranged in the high-voltage bushing, and the corresponding connecting end of the voltage loading piece extends into the closed air chamber. Through additionally arranging the high-voltage bushing, the electric connector is convenient to install.
Drawings
FIG. 1 is a schematic view illustrating a usage status of an embodiment of an insulation pull rod characteristic testing apparatus according to the present invention;
description of reference numerals: 1-a high voltage power supply; 2-electrical connection contact fingers; 3-high-pressure metal pull rod; 4-an electrostatic probe; 5-an observation window; 6-a wiring terminal; 7-an electrometer; 8-a potential measuring rod; 9-hydraulic tensile machine; 10-a grounded metal tie; 11-an insulating pull rod to be tested; 12-a closed air chamber; 13-pressure gauge; 14-a high voltage bushing; 15-an electrical connector; 16-patch panel.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
In the specific embodiment of the insulating pull rod characteristic testing device, as shown in fig. 1, the insulating pull rod characteristic testing device in the embodiment can simulate the actual use working condition of the insulating pull rod, and can realize the test of the insulating performance of the insulating pull rod under the simultaneous voltage loading and acting force loading.
The insulating pull rod characteristic testing device comprises a closed air chamber 12, wherein the closed air chamber 12 is a closed cylinder, and the closed air chamber 12 can be arranged on a movable support when in specific use. The gas in the closed gas chamber 12 may be sulfur hexafluoride gas or other test gas. A pressure gauge 13 is installed on the closed air chamber 12 to measure the air pressure in the closed air chamber 12, and an air charging and discharging port (not shown) is opened on the closed air chamber 12 to charge and discharge air into and out of the closed air chamber 12. An observation window 5 is arranged on the closed air chamber 12 so as to observe the internal condition of the closed air chamber 12 in real time.
The upper part of the closed air chamber 12 is provided with an opening, a high-pressure sleeve 14 is arranged at the opening, and the high-pressure sleeve 14 is hermetically arranged at the opening of the closed air chamber 12 through a flange. The terminal board 16 of the high-voltage bushing 14 is connected with a high-voltage power supply 1, specifically a high-voltage alternating current and direct current power supply. An electric connector 15 which is electrically connected with a wiring board 16 is arranged in the high-voltage bushing 14, as can be seen from fig. 1, the electric connector 15 integrally extends up and down, a U-shaped groove is arranged below the electric connector 15, an internal thread is arranged at the bottom of the groove, and an electric connection contact finger 2 is arranged on the groove wall of the groove. The electrical connection finger 2 is a structure of the prior art, and may be a spring finger or a watch band finger available on the market, for example.
A voltage loading part is connected to the electric connector 15 in a threaded manner, a grounding part is further arranged in the closed air chamber 12 in a penetrating manner, an obvious installation fracture is formed between the voltage loading part and the grounding part, and the installation fracture refers to the existing voltage difference between two ends of the installation fracture and can also be used for installing the insulating pull rod 11 to be tested. The voltage loading part in this embodiment is actually a high-voltage metal pull rod 3, the upper end of the high-voltage metal pull rod 3 is in threaded connection with an electric connector 15, and meanwhile, the high-voltage metal pull rod 3 is electrically connected with the electric connector 15 through an electric connection contact finger 2 to ensure conductive connection. The high-pressure metal tie rods 3 extend into the enclosed air chamber 12. The grounding member in this embodiment is actually a grounding metal pull rod 10, the lower end of the grounding metal pull rod 10 extends to the outside of the closed air chamber 12, the insulating pull rod characteristic testing device further comprises a hydraulic tension machine 9 located outside the closed air chamber 12, and the hydraulic tension machine 9 is connected with the grounding metal pull rod 10 and applies a tension action to the grounding metal pull rod 10. As can be seen from fig. 1, the closed air chamber 12 and the grounding metal tie rod 10 are grounded, specifically, in this embodiment, the closed air chamber 12 and the grounding metal tie rod 10 are grounded respectively, in other embodiments, only the closed air chamber 12 may be grounded, and the grounding metal tie rod 10 is electrically connected to the closed air chamber 12. Wherein, the grounded metal pull rod 10 penetrates through the closed air chamber 12 in a sealed manner, and a sealing structure (not shown in the figure) such as a sealing ring is arranged at the junction of the grounded metal pull rod 10 and the closed air chamber 12.
As can be seen from fig. 1, the device for testing the characteristics of the insulating pull rod further comprises an electrostatic measurement device for measuring the potential on the surface of the insulating pull rod 11 to be tested, the electrostatic measurement device comprises an electrostatic probe 4, the electrostatic probe 4 is located in a closed air chamber 12, a measurement signal of the electrostatic probe 4 is led out of the closed air chamber 12 from a connection terminal 6 and led to an electrometer 7, and the electrometer 7 is located outside the closed air chamber 12. The electrostatic measurement device further comprises a potential measurement rod 8, the electrostatic probe 4 is installed on the potential measurement rod 8, the lower end of the potential measurement rod 8 penetrates out of the closed air chamber 12 and guarantees sealing performance, specifically, a sealing ring sealing mode can be adopted, the potential measurement rod 8 can move up and down in a reciprocating mode relative to the closed air chamber 12, and therefore multi-position potential measurement of the insulating pull rod 11 to be measured from the high-voltage side to the low-voltage side surface is achieved.
In this embodiment, the power supply that drives the reciprocating motion about the electric potential measuring stick 8 is the motor, and the motor drives the reciprocating motion about the electric potential measuring stick 8 through transmission structure, and transmission structure specifically is rack and pinion structure, and in other embodiments, transmission structure still can be the crank arm structure. The high-voltage metal pull rod 3 and the grounding metal pull rod 10 are conductive pieces.
The insulating pull rod characteristic testing device is used as follows, an insulating pull rod 11 to be tested is arranged at an installation fracture formed by a high-voltage metal pull rod 3 and a grounding metal pull rod 10, the upper end of the insulating pull rod 11 to be tested is connected with the high-voltage metal pull rod 3, the lower end of the insulating pull rod 11 to be tested is connected with the grounding metal pull rod 10, and the specific connection mode is pin shaft connection. The distance between the electrostatic probe 4 and the insulating pull rod 11 to be measured is adjusted in advance according to the shape of the insulating pull rod 11 to be measured. Insulating gas is introduced into the closed air chamber 12 through the charging and discharging port, after the insulating pull rod 11 to be tested is connected between the high-voltage metal pull rod 3 and the grounding metal pull rod 10, the hydraulic tension machine 9 pressurizes, the upper end of the insulating pull rod 11 to be tested is fixedly connected with the high-voltage metal pull rod 3, the insulating pull rod 11 to be tested is subjected to continuous two-end tension, and then the high-voltage power supply 1 is electrified for a period of time and then is powered off. Then, the electrostatic probe 4 measures the potential on the surface of the insulating pull rod 11 to be measured, and the potentials at a plurality of positions in the axial direction of the insulating pull rod 11 to be measured can be measured by the up-and-down movement of the potential measuring rod 8.
For the insulating pull rods 11 to be tested with different cross-sectional shapes and different specifications, only the corresponding high-voltage metal pull rod 3 and the corresponding grounding metal pull rod 10 need to be designed in a matching manner.
In this embodiment, high-pressure metal pull rod 3 and ground connection metal pull rod 10 all can revolve around the axis of self, specifically, place hydraulic tension machine 9 on the carousel, because high-pressure metal pull rod 3 threaded mounting is on electric connector 15, rotate through the drive carousel and can drive hydraulic tension machine 9, ground connection metal pull rod 10, the insulating pull rod 11 that awaits measuring, high-pressure metal pull rod 3 rotates around the axis of self, can carry out comprehensive measurement to the insulating pull rod 11 that awaits measuring through electrostatic probe 4. In order to avoid the high-voltage metal pull rod 3 from being separated from the electric connector 15, the rotation of the insulating pull rod 11 to be tested can be performed in a mode of rotating anticlockwise and clockwise alternately.
The above embodiment is described by taking an example of measuring the electrostatic potential on the insulating rod 11 to be measured. This insulating pull rod characteristic test device can load voltage waveform examination such as lightning impulse, operation impact, power frequency voltage and await measuring the breakdown voltage value change of insulating pull rod 11 when different atresss, and at this moment, can observe the flashover phenomenon that insulating pull rod 11 that awaits measuring takes place when being punctured through observation window 5. When the electric potential measuring device is used for performing breakdown test on the insulating pull rod 11 to be tested, the electric potential measuring rod 8 and the electrostatic probe 4 are moved to the bottom of the closed air chamber 12 through the motor, so that the electrostatic measuring device is prevented from being broken down and damaged.
In this embodiment, in the actual test process, the air can be introduced into the closed air chamber 12 through the air inlet and outlet to change the pressure value in the closed air chamber 12, so that various characteristic measurements can be performed in a closed and pressure-adjustable gas environment.
In this embodiment, the tension value applied to the insulating pull rod 11 to be measured can be read by the hydraulic tension machine 9, or in other embodiments, the tension value applied to the insulating pull rod to be measured, the grounding metal pull rod or the high-voltage metal pull rod can be read by arranging the force sensor on the insulating pull rod to be measured, the grounding metal pull rod or the high-voltage metal pull rod.
In this embodiment, the hydraulic tensile machine 9 constitutes a hydraulic loading mechanism, i.e., a force loading mechanism, and in other embodiments, the force loading mechanism may be a pneumatic structure. The high-pressure metal tie rod 3 is actually a loading rod. The voltage loading piece and the grounding piece are connected with one end of the insulating pull rod to be tested to form a connecting end.
In this embodiment, the motor constitutes a driving mechanism, and in other embodiments, the driving mechanism may be a link mechanism or the like that drives the electric potential measuring rod to move up and down.
In the embodiment, the electrostatic probe 4 is fixed on the potential measuring rod 8, and the two move up and down together, in other embodiments, the potential measuring rod can be fixed on the closed air chamber, a chute extending up and down is formed in the potential measuring rod, the electrostatic probe is installed in the chute, and the electrostatic probe is driven by the driving mechanism to move up and down relative to the potential measuring rod.
In other embodiments, the potential measuring rod can be eliminated, and the electrostatic probe can be movably assembled on the inner wall of the closed air chamber.
In the above embodiments, the voltage loading part and the grounding part are both structures extending into the closed air chamber, and in other embodiments, the voltage loading part and the grounding part can be completely arranged in the closed air chamber.
In the above embodiments, the electrical connector is fixed to the closed air chamber through the high-voltage bushing, and in other embodiments, the electrical connector may be directly mounted to the closed air chamber.
Claims (10)
1. The utility model provides an insulating pull rod characteristic test device which characterized in that: the testing device comprises a closed air chamber with an observation window, and further comprises a voltage loading part and a grounding part which are arranged in the closed air chamber or extend into the closed air chamber at intervals relatively to form an installation fracture in the closed air chamber, wherein the voltage loading part and the grounding part are respectively provided with a connecting end used for being connected with an insulation pull rod to be tested at the installation fracture, and the testing device further comprises a force loading mechanism which is in transmission connection with the grounding part so as to apply pulling force to the insulation pull rod to be tested through the grounding part.
2. The insulation pull rod characteristic testing device according to claim 1, characterized in that: one end of the grounding piece, which is far away from the voltage loading piece, extends to the outside of the closed air chamber, and the force loading mechanism is positioned outside the closed air chamber and is in transmission connection with the corresponding end of the grounding piece.
3. The insulated draw bar characteristic testing device according to claim 1 or 2, wherein: the force loading mechanism is a hydraulic loading mechanism and is used for continuously applying tension to the insulating pull rod to be tested.
4. The insulated draw bar characteristic testing device according to claim 1 or 2, wherein: the testing device comprises a high-voltage sleeve fixedly arranged outside the closed air chamber and an electric connector arranged in the high-voltage sleeve, a voltage loading piece is a loading rod fixedly arranged on the electric connector in a split mode, the loading rod is provided with a corresponding connecting end extending into the closed air chamber and used for being connected with an insulating pull rod to be tested, and the loading rod is electrically connected with the electric connector.
5. The insulation pull rod characteristic testing device according to claim 4, wherein: the electric connector is provided with a groove with a notch facing the grounding piece, the loading rod is assembled at the bottom of the groove in a threaded manner, and the groove wall of the groove is electrically connected with the outer peripheral surface of the loading rod through an electric connection contact finger.
6. The insulated draw bar characteristic testing device according to claim 1 or 2, wherein: the testing device further comprises an electrostatic measuring device, the electrostatic measuring device comprises an electrostatic probe which is positioned in the closed air chamber and is used for measuring the surface potential of the insulating pull rod to be measured, and the electrostatic measuring device further comprises an electrometer which is connected with the electrostatic probe and is positioned outside the closed air chamber.
7. The insulation pull rod characteristic testing device according to claim 6, wherein: the static measuring device comprises a potential measuring rod with one end penetrating into the closed air chamber, the static probe is fixedly arranged at the end of the potential measuring rod, and the static measuring device also comprises a driving mechanism which is positioned outside the closed air chamber and used for driving the potential measuring rod to reciprocate along the interval arrangement direction of the voltage loading part and the grounding part.
8. The insulation pull rod characteristic testing device according to claim 6, wherein: the voltage loading part and the grounding part are rotatably assembled on the closed air chamber along the axis of the voltage loading part and the grounding part, so that the circumferential potential measurement of the insulating pull rod to be measured is realized.
9. The insulation pull rod characteristic testing device according to claim 8, wherein: the testing device comprises an electric connector fixedly arranged on the closed air chamber, and the voltage loading part is assembled on the electric connector in a threaded mode.
10. The insulation pull rod characteristic testing device according to claim 9, wherein: the testing device comprises a high-voltage bushing fixedly arranged outside the closed air chamber, the electric connector is arranged in the high-voltage bushing, and the corresponding connecting end of the voltage loading piece extends into the closed air chamber.
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| CN201910080119.7A CN111487510B (en) | 2019-01-28 | 2019-01-28 | Insulating pull rod characteristic testing device |
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| CN201910080119.7A CN111487510B (en) | 2019-01-28 | 2019-01-28 | Insulating pull rod characteristic testing device |
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| CN114184913A (en) * | 2021-11-30 | 2022-03-15 | 国网重庆市电力公司电力科学研究院 | C5F10O-mixed gas electrical insulation characteristic test method |
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