CN111487510A - Insulating pull rod characteristic testing device - Google Patents

Abstract

The invention relates to an insulating tie rod characteristic testing device. The insulating tie rod characteristic testing device comprises a closed air chamber with an observation window, and a relatively spaced arrangement in the closed air chamber or extending into the closed air chamber to form installation fractures in the closed air chamber. A voltage loading piece and a grounding piece, the voltage loading piece and the grounding piece respectively have a connection end for connecting with the insulating rod to be tested at the installation fracture, and the testing device also includes a driving connection with the grounding piece to pass the grounding piece to the test piece. A force-loading mechanism that applies tensile force to an insulated pull rod. The insulating tie rod to be tested can be subjected to the superposition of voltage load and mechanical force at the same time, and the two are coupled with each other. At this time, the test environment of the insulating tie rod to be tested is consistent with the actual use environment of the insulating tie rod to be tested. The insulation performance of the insulation rod to be tested is closer to the actual situation, and the reliability is higher.

Description

A device for testing the characteristics of insulating tie rods

technical field

The invention relates to the field of power transmission insulation equipment, in particular to an insulation pull rod characteristic testing device.

Background technique

When in use, the insulating pull rod connects the crank arm and the moving contact part, and plays the role of transmitting the driving force of the operating mechanism to drive the opening and closing operation of the moving contact part. The role of the moving mechanism. Therefore, the mechanical properties and insulation properties of the insulating rods affect the normal on-off of the switch.

For example, the Chinese invention patent application with the application publication number CN103353574A discloses an insulation test device for an insulating pull rod for GIS, which specifically includes a cylindrical shell, and an upper support seat and a lower support seat are arranged at intervals in the shell. A high-voltage contact conductor is also provided. When in use, the two ends of the insulating rod to be tested are connected to the upper support seat and the high-voltage contact conductor respectively through metal connecting sheets with certain flexibility, and the high-voltage power supply is applied to the insulating rod to be tested through the lower support seat. Lightning impulse, 1min power frequency voltage and 30min partial discharge are used to test the insulation performance of the insulation rod to be tested.

For example, the Chinese utility model patent with the authorization announcement number CN206056943U discloses an insulating pull rod test device, which includes a base plate, a circuit breaker operating mechanism and a buffer installed on the base plate. The ends are respectively fixedly connected with the circuit breaker operating mechanism and the buffer. The circuit breaker operating mechanism drives the insulating rod to be tested to reciprocate, and the buffer provides resistance during the reciprocating movement. Whether the joint and the insulator are firmly connected.

As can be seen from the above, in the prior art, the mechanical properties and insulating properties of the insulating tie rods are tested separately. Since the insulating tie rod will be subjected to continuous force during use, it is necessary to ensure specific insulating properties under the premise of the force. However, at present, the insulation performance test of the insulation rod is completed in a static environment, and the insulation rod is not subject to other forces except gravity during the whole test process. This test environment does not match the actual working environment of the insulation rod. There is a deviation between the measured insulation performance of the insulating tie rod and the insulation performance in actual work, resulting in relatively low reliability of the test results.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a device for testing the characteristics of insulating tie rods that performs voltage loading and force loading at the same time, so as to solve the problem of low reliability of insulation performance test results of insulating tie rods due to only voltage loading in the prior art. question.

In order to achieve the above purpose, the technical scheme of the insulating tie-rod characteristic testing device of the present invention is: an insulating tie-rod characteristic testing device, including a closed air chamber with an observation window, and a relatively spaced arrangement in the closed air chamber or extending into the closed air chamber. The voltage loading piece and the grounding piece are used to form the installation fracture in the closed air chamber. The voltage loading piece and the grounding piece respectively have connection ends for connecting with the insulating rod to be tested at the installation fracture. The testing device also includes a grounding piece. The transmission connection is a force loading mechanism that applies tensile force to the insulation rod to be tested through the grounding piece.

The beneficial effects of the present invention are as follows: the device for testing the characteristics of an insulating tie rod provided by the present invention includes a closed air chamber, and a voltage loading member and a grounding member are arranged at intervals in the closed air chamber, or the voltage loading member and the grounding member extend into the closed air chamber, and the voltage loading member The installation fracture is formed with the grounding piece, and the testing device also includes a force loading mechanism for applying a tensile force to the grounding piece. When in use, install the two ends of the insulation rod to be tested on the voltage loading member and the grounding member respectively, apply voltage to the insulation rod to be tested through the voltage loading member, and apply tension to the insulation rod to be tested through the force loading mechanism and the grounding member. The insulating tie rod to be tested can be subjected to the superposition of voltage load and tensile force at the same time, and the two are coupled with each other. At this time, the test environment of the insulating tie rod to be tested is consistent with the actual use environment of the insulating tie rod to be tested. The insulation performance of the insulating tie rod is closer to the actual situation, and the reliability is higher.

Further, one end of the grounding member away from the voltage loading member extends to the outside of the closed air chamber, and the force loading mechanism is located outside the closed air chamber and is drivingly connected with the corresponding end of the grounding member. Arranging the force loading mechanism in the closed air chamber will pollute the insulating gas in the closed air chamber, and produce metal particles that are harmful to the electric field, etc., which will affect the insulation characteristic test.

Further, the force loading mechanism is a hydraulic loading mechanism, so as to continuously exert a pulling force on the insulating pull rod to be tested. The hydraulic loading mechanism can continuously exert pressure on the grounding parts, which is closer to the actual working conditions.

Further, the test device includes a high-voltage bushing fixed outside the closed air chamber and an electrical connector set in the high-voltage bushing, and the voltage loading member is a loading rod that is separately fixed on the electrical connector, and the loading rod has a The corresponding connection ends extend into the closed air chamber and are used for connecting with the insulating pull rod to be tested, and the loading rod is electrically connected with the electrical connection head. By additionally setting high-voltage bushings, the electrical connectors can be easily arranged, and the loading rods are separately arranged on the electrical connectors. For insulating rods of different specifications and parameters to be tested, the loading rods can be replaced to complete the test, which is more versatile.

Further, the electrical connector has a groove with the notch facing the grounding member, the loading rod is screwed to the bottom of the groove, and the groove wall of the groove and the outer peripheral surface of the loading rod are electrically connected to each other. The connection contacts are electrically connected. A groove is arranged on the electrical connector, and electrical connection contact fingers are arranged between the groove wall and the outer peripheral surface of the loading rod. The electrical connection contact fingers can ensure stable and conductive connection between the electrical connector and the loading rod.

Further, the test device also includes an electrostatic measurement device, the electrostatic measurement device includes an electrostatic probe located in the closed air chamber to measure the surface potential of the insulating rod to be tested, and an electrostatic meter connected to the electrostatic probe and located outside the closed air chamber. . By setting the electrostatic measuring device, the potential on the surface of the insulating rod to be tested can be measured after the voltage is loaded, and the electrometer is located outside the closed air chamber, so as to reduce the pollution to the insulating gas in the closed air chamber as much as possible.

Further, the electrostatic measuring device includes a potential measuring rod with one end penetrating into the closed air chamber, the electrostatic probe is fixed on the end of the potential measuring rod, and the electrostatic measuring device also includes a potential measuring rod located outside the closed air chamber and used for driving the potential measurement. A driving mechanism for the rod to reciprocate along the spacing arrangement direction of the voltage loading member and the grounding member. When in use, the driving mechanism can drive the potential measuring rod and the electrostatic probe to reciprocate along the spaced direction of the voltage loading member and the grounding member, and can measure the potential of the insulation rod to be measured at multiple positions from the high voltage side to the low voltage side.

Further, both the voltage loading member and the grounding member are rotatably assembled on the closed air chamber along their own axes, so as to realize the circumferential potential measurement of the insulating rod to be measured. The voltage loading part and the grounding part can rotate around their own axis with the insulating part to be tested, so as to realize the potential measurement of the circumferential positions of the insulating part to be tested.

Further, the testing device includes an electrical connector fixed on the closed air chamber, and the voltage loading member is screwed onto the electrical connector. The voltage loading member is installed on the electrical connector by means of screw assembly, which can not only ensure the firm connection between the voltage loading member and the electrical connector, but also facilitate the rotation of the voltage loading member.

Further, the testing device includes a high-voltage bushing fixed outside the closed air chamber, the electrical connection head is provided in the high-voltage sleeve, and the corresponding connection end of the voltage loading member extends into the closed air chamber. By additionally setting the high-voltage bushing, it is convenient to install the electrical connector.

Description of drawings

1 is a schematic diagram of the use state of an embodiment of an insulating tie rod characteristic testing device of the present invention;

Description of reference numerals: 1-high voltage power supply; 2-electric connection contact finger; 3-high voltage metal rod; 4-electrostatic probe; 5-observation window; 6-connection terminal; 7-electrometer; 8-potential measuring rod; 9 -Hydraulic tension machine; 10-grounded metal rod; 11-insulation rod to be tested; 12-closed air chamber; 13-pressure gauge; 14-high voltage bushing; 15-electrical connector; 16-terminal board.

Detailed ways

The embodiments of the present invention will be further described below with reference to the accompanying drawings.

A specific embodiment of the insulating tie rod characteristic testing device of the present invention, as shown in FIG. 1 , the insulating tie rod characteristic testing device in this embodiment can simulate the actual working conditions of the insulating tie rod, and can realize that the insulating tie rod is subjected to voltage loading and action at the same time. Testing of insulation properties under force loading.

The insulating tie-rod characteristic testing device includes a closed air chamber 12, which is a closed cylinder. In specific use, the closed air chamber 12 can be installed on a movable bracket. 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 in the figure) is opened on the closed air chamber 12 to measure the air pressure in the closed air chamber 12 Inflate and deflate. An observation window 5 is opened on the closed air chamber 12 so as to observe the internal conditions of the closed air chamber 12 in real time.

The upper part of the closed air chamber 12 has an opening, and a high-voltage sleeve 14 is installed at the opening. The high-voltage sleeve 14 is sealed and installed at the opening of the closed air chamber 12 through a flange. The wiring board 16 of the high-voltage bushing 14 is connected to a high-voltage power supply 1, specifically a high-voltage AC and DC power supply. An electrical connector 15 that is electrically connected to the wiring board 16 is installed inside the high-voltage bushing 14 . As can be seen from FIG. 1 , the electrical connector 15 extends up and down as a whole, and a U-shaped groove is provided below the electrical connector 15 , the bottom of the groove is provided with an internal thread, and the groove wall of the groove is provided with electrical connection contact fingers 2. In this embodiment, the electrical connection contact fingers 2 are arranged at intervals in the up and down direction. In other embodiments , the number of the electrically connected contact fingers 2 can be changed according to the actual situation. The electrical connection contact finger 2 is a structure in the prior art, for example, it may be a spring contact finger or a watch strap contact finger that can be purchased in the market.

A voltage loading member is threadedly connected to the electrical connector 15, and a grounding member is also worn in the closed air chamber 12. An obvious installation fracture is formed between the voltage loading member and the grounding member. The installation fracture refers to the two ends of the installation fracture. There is not only a voltage difference between them, but also an insulating rod 11 to be tested can be installed. The voltage loading member in this embodiment is actually a high-voltage metal tie rod 3 , and the upper end of the high-voltage metal tie rod 3 is threadedly connected to the electrical connector 15 , and at the same time, the contact finger 2 is electrically connected between the high-voltage metal tie rod 3 and the electrical connector 15 to ensure electrical conduction. connect. The high-pressure metal tie rod 3 extends into the closed air chamber 12 . The grounding member in this embodiment is actually a grounding metal tie rod 10 , and the lower end of the grounding metal tie rod 10 extends to the outside of the closed air chamber 12 , and the insulating pull rod characteristic testing device further includes a hydraulic tension machine 9 located outside the closed air chamber 12 . The hydraulic tension machine 9 is connected to the grounding metal pull rod 10 and exerts a pulling force on the grounding metal pull rod 10 . It can be seen from FIG. 1 that the closed air chamber 12 is grounded to the grounded metal rod 10. Specifically, in this embodiment, the closed air chamber 12 and the grounded metal rod 10 are grounded respectively. In other embodiments, only the closed air can be grounded. The chamber 12 is grounded, and the grounded metal tie rod 10 can be electrically connected to the closed air chamber 12 . Wherein, the grounded metal rod 10 is sealed through the closed air chamber 12, and a sealing structure such as a sealing ring is arranged at the junction of the grounded metal rod 10 and the closed air chamber 12 (not shown in the figure).

It can be seen from FIG. 1 that the insulating rod characteristic testing device also includes an electrostatic measuring device for measuring the potential on the surface of the insulating rod 11 to be tested. The electrostatic measuring device includes an electrostatic probe 4, which is located in the closed air chamber 12, and the electrostatic probe 4 The measurement signal of 1 is led out of the closed air chamber 12 from the connection terminal 6 and led to the electrometer 7 , and the electrometer 7 is located outside the closed air chamber 12 . The electrostatic measuring device further includes a potential measuring rod 8, the electrostatic probe 4 is installed on the potential measuring rod 8, and the lower end of the potential measuring rod 8 is pierced through the closed air chamber 12 to ensure tightness. Specifically, a sealing ring sealing method can be adopted. , the potential measuring rod 8 can reciprocate up and down relative to the closed air chamber 12, so as to realize the potential measurement of multiple positions on the surface of the insulating rod 11 to be measured from the high voltage side to the low voltage side surface.

In this embodiment, the power source that drives the potential measuring rod 8 to reciprocate up and down is a motor, and the motor drives the potential measuring rod 8 to reciprocate up and down through the transmission structure. The transmission structure is specifically a rack and pinion structure. In other embodiments, the transmission structure also It can be a crank arm structure. The high-voltage metal tie rod 3 and the grounded metal tie rod 10 are both conductive parts.

The use process of the insulating tie rod characteristic testing device of the present invention is as follows. The insulating tie rod 11 to be tested is installed at the installation fracture formed by the high-voltage metal tie rod 3 and the grounded metal tie rod 10. The upper end of the insulating tie rod 11 to be tested is connected to the high-voltage metal tie rod 3 The lower end is connected with the grounding metal rod 10, and the specific connection method is pin connection. The distance between the electrostatic probe 4 and the insulating rod 11 to be tested is adjusted in advance according to the shape of the insulating rod 11 to be tested. Insulating gas is introduced into the closed air chamber 12 through the air charging and discharging port, and the insulating pull rod 11 to be tested is connected between the high-voltage metal pull rod 3 and the ground metal pull rod 10, and the hydraulic tension machine 9 is pressurized. The upper end is fixedly connected with the high-voltage metal rod 3, so that the insulating rod 11 to be tested is subjected to continuous pulling force at both ends, and then the high-voltage power supply 1 is powered on for a period of time and then powered off. Afterwards, the electrostatic probe 4 measures the potential on the surface of the insulating rod 11 to be measured, and the potential of multiple positions on the axial direction of the insulating rod 11 to be measured can be measured by moving the potential measuring rod 8 up and down.

For insulating rods 11 with different cross-sectional shapes and specifications to be tested, it is only necessary to match and design the corresponding high-voltage metal rods 3 and grounding metal rods 10 .

In this embodiment, both the high-voltage metal tie rod 3 and the grounded metal tie rod 10 can rotate around their own axes. Specifically, the hydraulic pulling machine 9 is placed on the turntable. Since the high-voltage metal tie rod 3 is threadedly mounted on the electrical connector 15, By driving the turntable to rotate, the hydraulic tension machine 9, the grounding metal rod 10, the insulating rod 11 to be tested, and the high-voltage metal rod 3 can be driven to rotate around their own axes, and the electrostatic probe 4 can be used. In order to prevent the high-voltage metal tie rod 3 from coming out of the electrical connector 15 , the rotation of the insulating tie rod 11 to be tested may be performed by alternately rotating counterclockwise and clockwise.

In the above embodiments, the measurement of the electrostatic potential on the insulating rod 11 to be measured is used as an example for description. The insulating tie-rod characteristic testing device can be loaded with voltage waveforms such as lightning shock, operation shock, power frequency voltage, etc. to examine the change of the breakdown voltage value of the insulating tie-rod 11 to be tested under different forces. At this time, the observation window 5 can be used. The flashover phenomenon that occurs when the insulating tie rod 11 is broken down. When used in the breakdown test of the insulating rod 11 to be measured, the potential measuring rod 8 and the electrostatic probe 4 are moved to the bottom of the closed air chamber 12 by the motor to avoid the electrostatic measuring device from being damaged by breakdown.

In this embodiment, during the actual test process, the air in the closed air chamber 12 can be ventilated through the air charging and discharging port to change the pressure value in the closed air chamber 12, and various characteristics can be realized in a closed and adjustable gas environment. Measurement.

In this embodiment, the tensile force value of the insulating tie rod 11 to be tested can be read by the hydraulic tension machine 9, or in other embodiments, a force sensor can be arranged on the insulating tie rod to be tested, the grounded metal tie rod or the high-voltage metal tie rod to Read the force value of the insulation rod to be tested.

In this embodiment, the hydraulic tension machine 9 constitutes a hydraulic loading mechanism, that is, a force loading mechanism. In other embodiments, the force loading mechanism may be a pneumatic structure. The high-pressure metal tie rod 3 is actually a loading rod. One end of the voltage loading part and the grounding part connected with the insulating rod to be tested is the connection end.

In this embodiment, the motor constitutes a driving mechanism, and in other embodiments, the driving mechanism may be a link mechanism that drives the potential measuring rod to move up and down, or the like.

In this 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, and the potential measuring rod is provided with a chute extending up and down. , install the electrostatic probe in the chute, and drive the electrostatic probe to move up and down relative to the potential measuring rod through the driving mechanism.

In other embodiments, the potential measuring rod can be eliminated, and the electrostatic probe can be moved and assembled on the inner wall of the closed air chamber.

In the above embodiments, the voltage loading member and the grounding member are both structures extending into the closed air chamber. In other embodiments, the voltage loading member and the grounding member can be completely placed in the closed air chamber.

In the above-mentioned embodiments, the electrical connection head is fixed on the closed air chamber through the high-voltage bushing. In other embodiments, the electrical connection head can be directly installed on 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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