CN113125914B - Test platform for water diffusion test of composite insulator with jacket core rod - Google Patents

Abstract

A test platform for water diffusion test of composite insulator with sheath mandrel, including voltage regulator, test transformer, voltage divider, test bench, infrared imaging camera, infrared remote control switch, upper plate, lower plate, insulation Bracket, digital microammeter, controller, display and residual current action relay; the test transformer is connected with the voltage regulator and the voltage divider. The input terminal is connected, the infrared remote control switch is connected with the high voltage lead output terminal and the upper plate; the lower plate is connected with the digital microammeter, the digital microammeter is connected with the controller, the display is connected with the infrared imaging camera and the controller, and the residual current is activated. The relay is installed in the power supply box. The infrared remote control switch is controlled by the controller to be disconnected, so as to avoid the failure of any insulator to be tested to affect the continuation of the test of other insulators to be tested, so that multiple insulator tests to be tested can be performed simultaneously.

Description

A test platform for water diffusion test of composite insulator with sheath mandrel

technical field

The invention relates to the field of high-voltage test platforms, in particular to a test platform for water diffusion test of composite insulators with sheathed mandrels.

Background technique

Composite insulators have the advantages of light weight, high strength, convenient manufacturing and installation, and resistance to pollution flashover. They are widely used in power transmission lines, which not only prevent large-scale pollution flashover accidents, but also greatly reduce the operation and maintenance of polluted areas. cost, and achieved good operating results. When the outer skin of the composite insulator is damaged or the interface of the mandrel sheath is not firmly bonded, moisture will penetrate from the surface of the sheath to the mandrel, causing partial discharge of the mandrel due to moisture, and the insulation performance of the mandrel will decrease for a long time. The sheath mandrel water diffusion test is a routine inspection test for composite insulators, which can test the mandrel of the insulator and the insulation performance between the mandrel and the sheath.

At present, there is no test platform specially suitable for the water diffusion test of composite insulators with sheathed mandrels on the market. Most of the test projects are carried out using traditional pressure-resistant equipment and external microammeters, because each insulator sample needs to be tested. For data monitoring and analysis, only samples can be tested one by one, which has low work efficiency and test results are affected by human analysis errors. At the same time, the frequent replacement of composite insulators under test not only produces a lot of repetitive labor, but also easily forgets the grounding wire during the wiring replacement process, causing a series of safety problems.

SUMMARY OF THE INVENTION

In order to overcome the deficiencies of the prior art, the present invention provides a test platform for water diffusion test of composite insulators with sheathed mandrels, so that multiple insulator tests can be carried out at the same time.

In order to realize the above-mentioned purpose of the invention, the present invention adopts the following technical solutions:

A test platform for water diffusion test of composite insulator sheathed mandrel, including voltage regulator, test transformer, voltage divider, test bench, infrared imaging camera, infrared remote control switch, upper pole plate, lower pole plate, insulation Stands, digital microammeters, controllers, displays and residual current operated relays. The test transformer is connected to a voltage regulator and a voltage divider, the test bench is provided with a high-voltage lead input end and a number of high-voltage lead output ends, the voltage divider is connected to the high-voltage lead input end, and the infrared remote control switch is connected to the high-voltage lead. The lead output end is connected with the upper plate; the lower plate is connected with the digital microammeter, the digital microammeter is connected with the controller, the display is connected with the infrared imaging camera and the controller, and the residual current acts as a relay Installed in the power supply box, set the action current threshold, and the action time is quick action without delay.

The voltage regulator, the test transformer and the voltage divider constitute a boosting system. By adjusting the voltage regulator to change the voltage, the test transformer increases the voltage to the test voltage, and the voltmeter of the voltage divider shows the voltage to be Test the withstand voltage of the insulator.

Further, the top of the test bench is provided with a high-voltage lead input end and a number of high-voltage lead output ends, the high-voltage lead input end and a number of high-voltage lead output ends are installed with insulating materials, and the high-voltage lead input end and the high-voltage lead output end are connected by high-voltage wires. For connection, the high-voltage wire used has an insulating sheath, so that the high-voltage wire is not exposed.

Further, the infrared imaging camera is installed on the top of the test bench, and the installation place of the infrared imaging camera is made of insulating materials, and all insulating materials can withstand 30KV overvoltage, so as to prevent the high-voltage system from interfering with the low-voltage system and affecting the infrared imaging. The camera collects the image signal of the insulator to be tested.

Further, the insulating bracket is used to support the lower electrode plate, and the lower electrode plate is installed with insulating material to prevent current from flowing into the ground and affecting the test result.

Further, the infrared imaging camera has an alarm function of abnormal temperature rise, and sets an abnormal temperature rise threshold. When the abnormal temperature rise exceeds the abnormal temperature rise threshold, an abnormal temperature rise alarm is issued, and the corresponding abnormal temperature rise alarm is issued. The insulator to be tested is unqualified, and the insulator to be tested corresponding to no abnormal temperature rise alarm is qualified; the infrared imaging camera has a large enough viewing angle, so that all the insulators to be tested are reflected in the viewing angle of the infrared imaging camera.

Further, the controller collects the current of the insulator to be tested, and sets an infrared remote control current threshold. When the current value of the insulator to be tested collected by the controller is greater than the infrared remote control current threshold, the controller controls the infrared remote control switch to disconnect, And carry out data processing, and transmit the data to the display.

Further, the display shows a number of microammeters of the insulator to be tested-time line graph and has an acousto-optic alarm function, if the current value of the insulator to be tested rises with time, the display corresponds to the numbered sub-window to issue an acousto-optic alarm, if When the insulator to be tested exceeds the current threshold of the infrared remote control, the corresponding numbered sub-window of the display also emits an audible and visual alarm, the insulator to be tested corresponding to the audible and visual alarm is judged to be unqualified, and the insulator to be tested corresponding to no audible and visual alarm is qualified.

Beneficial effects of the invention: the test platform has sound and light alarms and alarms for abnormal temperature rise, automatically recognizes whether the insulator to be tested is qualified, and controls the infrared remote control switch to disconnect through the controller, so as to avoid any unqualified insulator to be tested affecting other to-be-tested insulators The test of the insulator to be tested continues, so that multiple tests of the insulator to be tested can be carried out at the same time.

Description of drawings

FIG. 1 is a schematic structural diagram of a test platform for a water diffusion test of a composite insulator tape-sheathed mandrel according to the present invention.

The reference numbers are as follows:

1-voltage regulator, 2-test transformer, 3-voltage divider, 4-test bench, 5-infrared imaging camera, 6-infrared remote control switch, 7-upper plate, 8-lower plate, 9-insulation bracket , 10-digital microammeter, 11-controller, 12-display, 13-residual current action relay, 14-high voltage lead input, 15-high voltage lead output.

Detailed ways

The embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings.

As shown in Figure 1, a test platform for the water diffusion test of composite insulator sheathed mandrels includes a voltage regulator 1, a test transformer 2, a voltage divider 3, a test bench 4, an infrared imaging camera 5, an infrared remote control Switch 6 , upper plate 7 , lower plate 8 , insulating support 9 , digital microammeter 10 , controller 11 , display 12 and residual current action relay 13 . The test transformer 2 is connected to the voltage regulator 1 and the voltage divider 3. The test bench 4 is provided with a high-voltage lead input end 14 and several high-voltage lead output ends 15. The high-voltage lead input end 14 is connected to the voltage divider 3, and the infrared remote control switch 6 is connected to The high-voltage lead output end 15 is connected with the upper plate 7; the lower plate 8 is connected with the digital microammeter 10, the digital microammeter 10 is connected with the controller 11, and the display 12 is connected with the infrared imaging camera 5 and the controller 11; the described The residual current action relay 13 is installed in the power supply box, and the action current threshold is set, and the action time is quick action without delay.

The voltage regulator 1, the test transformer 2 and the voltage divider 3 form a boosting system. The voltage is changed by adjusting the voltage regulator 1, and the test transformer 2 increases the voltage to the test voltage. The voltmeter of the voltage divider 3 displays the insulator to be tested. Withstand voltage, and control regulator 1 to increase the voltage to the test voltage according to this table reading.

The top of the test bench 4 is provided with a high-voltage lead input end 14 and a number of high-voltage lead output ends 15. The high-voltage lead input end 14 and a number of high-voltage lead output ends 15 are installed with insulating materials. The high-voltage lead input end 14 and the high-voltage lead output end 15 are installed. Connected by high-voltage wires, the high-voltage wires used have an insulating sheath, so that the high-voltage wires are not exposed.

The infrared imaging camera 5 is installed on the top of the test bench 4, and the installation place of the infrared imaging camera 5 is made of insulating materials. All insulating materials can withstand 30KV overvoltage, so as to avoid the interference of the high-voltage system to the low-voltage system and affect the infrared imaging camera 5 to collect the insulator to be tested. image signal. The infrared imaging camera 5 has a large enough viewing angle, so that all the insulators to be tested are reflected in the viewing angle of the infrared imaging camera 5. The infrared imaging camera 5 is connected to the display 12 through a low-voltage secondary circuit, so that the image signal collected by the infrared imaging camera 5 is output. To the display 12, the infrared imaging camera 5 has an alarm function of abnormal temperature rise, and a threshold value of abnormal temperature rise is set. The measured insulator is unqualified, and the insulator to be tested corresponding to no abnormal temperature rise alarm is qualified.

The infrared remote control switch 6 is controlled by the controller 11 to open or close the infrared remote control switch 6 through the infrared remote control, and the infrared remote control current threshold is set. When the current value of the digital microammeter 10 is greater than the infrared remote control current threshold, the controller 11 is controlled by the infrared remote control. The infrared remote control switch 6 is disconnected. Through infrared remote control, it is possible to avoid the interruption of the test of other insulators to be tested due to the failure of any one of the insulators to be tested. The infrared remote control switch 6 does not have the arc extinguishing function, and cannot break the strike through current. Therefore, a breaking delay (0.5s) should be set, and the strike through current is broken by the residual current action relay 13, and the disconnected residual current action relay 13 Both the infrared remote control switch 6 and the infrared remote control switch 6 need to be reset manually after the test.

The pole plate includes an upper pole plate 7 and a lower pole plate 8, the upper pole plate 7 and the lower pole plate 8 constitute a movable pole plate, the upper pole plate 7 is provided with a raised conductive input end, and the raised conductive input end is connected to the high-voltage wire. Connection, the upper pole plate 7 is connected with the infrared remote control switch 6 through a high-voltage wire, the lower pole plate 8 is provided with a raised conductive output terminal, and the raised conductive output terminal is connected with the high-voltage wire, and the lower pole plate 8 is connected with the digital microammeter. 10 connections. The movable pole plate formed by the upper pole plate 7 and the lower pole plate 8 is used to fix the insulator to be tested. The upper electrode plate 7 and the lower electrode plate 8 constitute a capacitor. In this test power system load, because there is no other load except the electrode plate and the insulator to be tested, the load shows capacitance. voltage at the voltage terminal), so the voltage divider 3 has a voltmeter to accurately measure the load voltage and reduce the influence of the capacity rise effect.

The insulating bracket 9 is used to support the lower pole plate 8, and the installation place of the lower pole plate 8 is made of insulating material to prevent the current from flowing into the ground and affecting the test result.

The digital microammeter 10 is connected to the lower plate 8 and the controller 11 through a secondary loop circuit, and the digital microammeter 10 is calibrated regularly to ensure the reliability of the verification data.

The controller 11 collects the current readings of several digital microammeters 10 in real time, and sets the infrared remote control current threshold value. When the current value collected by the controller 11 is greater than the infrared remote control current threshold value, the controller 11 controls the infrared remote control switch 6 to disconnect, and conducts the operation. The data is processed, and the data is transmitted to the display 12, and the display 12 displays the test results.

The display 12 has the functions of displaying the signal image collected by the infrared imaging camera 5, displaying the current value of the digital microammeter 10 according to the label of the insulator to be tested, displaying the digital microammeter data-time line graph and sound and light alarm. The display 12 displays the label of the insulator to be tested and displays the microammeter-time line chart in turn. If the current value of the digital microammeter 10 keeps rising with time, considering the deterioration of the insulation performance of the insulator, the display 12 corresponding to the numbered sub-window issues an audible and visual alarm. If the data of the microammeter 10 exceeds the current threshold of the infrared remote control, the corresponding numbered sub-window of the display should also send out an audible and visual alarm. The insulator to be tested corresponding to the audible and visual alarm is judged to be unqualified, and the insulator to be tested corresponding to no audible and visual alarm is qualified. .

The residual current action relay 13 is installed in the power supply box, and the action current threshold is set, and the action time is quick action without delay.

Example 1:

The embodiment of the present invention provides a test platform for a water diffusion test of a composite insulator tape sheathed mandrel. The specific implementation method includes the following steps:

Step 1: Use a diamond circular saw blade to cut 6 samples on 1 insulator under running cool water, the cutting direction is 90° to the axis of the core, and the length of the sample should be 30mm±0.5mm (mm). The cutting surface of the sample should be polished with 180-mesh fine abrasive cloth, and the two cutting end surfaces should be clean and parallel to each other.

Step 2: After scrubbing the cut samples with isopropanol and filter paper before boiling, immediately place them in a suitable container (such as glass or stainless steel container) and cook in deionized water containing 0.1% NaCl (by weight). 100h±0.5h(h:hour).

Step 3: After boiling, the sample should be taken out from Rongduhu and placed in another container (such as glass or stainless steel container) filled with tap water at room temperature for at least 15min (min:min).

Step 4: Number the boiled insulators to be tested as 1-6, and place them in sequence between the upper plate 7 and the lower plate 8 of the test platform and fix them firmly. The high voltage leads are clamped on the flat iron of the upper plate 7 through iron clips.

Step 5: Manually close the infrared remote control switch 6 and the residual current action relay 13. Turn on the secondary power supply of the power distribution box, manually reset the digital microammeter 10, select the appropriate range (AC 1mA), initialize the infrared imaging camera 5, adjust the focal length to make the image clear, and reset the sound and light alarm of the display 12.

Step 6: Pull out the grounding wire, manually adjust the voltage regulator 1 to increase the voltage slowly at a speed of 1kV/s, observe the voltmeter reading of the voltage divider 3 during the boosting process, and withstand the voltage for 1min after 12kV.

Step 7: During this 1min, pay attention to whether the display 12 alarms. If there is an alarm, pay attention to the sample number of the insulator that alarmed. The insulator corresponding to the alarm is judged to be unqualified.

Step 8: If there is an insulator that exceeds the infrared remote control current threshold of 500 microamps within 1 minute, the insulator corresponding to the infrared remote control switch 6 is automatically disconnected, the sample is unqualified, and other samples continue to be tested.

Step 9: If there is an instantaneous breakdown of the sample, considering the reasons for protecting equipment and personnel, the residual current action relay 13 trips, and the experiment ends.

Step 10: If there is no residual current action relay 13 tripping, after 1min, manually lower it to zero, power off, hang the ground wire, record the display 12 alarm insulator number or infrared remote control switch 6 disconnect the insulator number or breakdown the insulator number (The insulator after breakdown will obviously turn black and have holes).

Step 11: The test of this batch of insulator samples is over, and the next batch of insulation samples should be replaced. The test of all insulators to be tested should be completed within 3 hours after being taken out of the boiling container.

In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "top/bottom", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for convenience The invention is described and simplified without indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention.

In the description of the present invention, the test platform can simultaneously perform the water diffusion test of 6 tested insulators with sheathed mandrels. The number 6 is only an example of the present invention. Those of ordinary skill in the art can change the number of tested insulators. within the scope of protection of the present invention.

The above is only to illustrate the embodiments of the present invention, and not to limit the present invention. For those skilled in the art, all within the spirit and principle of the present invention, without any modification, equivalent replacement or improvement made by creative work etc., should be included within the protection scope of the present invention.

Claims (7)

1. a test platform for composite insulator band sheath mandrel water diffusion test, is characterized in that, comprises voltage regulator, test transformer, voltage divider, test stand, upper pole plate, lower pole plate, insulating support, Digital microammeter, residual current action relay, infrared remote control switch, display, infrared imaging camera and controller; the test transformer is connected with a voltage regulator and a voltage divider, and the voltage regulator, the test transformer and the voltage divider are composed of Step-up system, the voltage is changed by adjusting the voltage regulator, and the test transformer increases the voltage to the test voltage; the test bench is provided with a high-voltage lead input end and a number of high-voltage lead output ends, and the voltage divider is connected to the test bench. The high voltage lead input end of the infrared remote control switch is connected to the high voltage lead output end of the test bench and the upper plate, the lower plate is connected to the digital microammeter, and the digital microammeter is connected to the controller; The top of the test bench is provided with an infrared imaging camera, the insulating bracket is used to support the lower plate, the residual current action relay is installed in the power supply box, the action current threshold is set, and the action time is fast action without delay; The display is connected with the infrared imaging camera and the controller, and the display receives the image signal collected by the infrared imaging camera and the data of the controller, the controller controls the infrared remote control switch to open and close; the controller collects the current of the insulator to be tested , and set the infrared remote control current threshold. When the current value of the insulator to be tested collected by the controller is greater than the infrared remote control current threshold, the controller controls the infrared remote control switch to disconnect, and performs data processing to transmit the data to the display. 2. The test platform for the water diffusion test of composite insulators with sheathed mandrels according to claim 1, wherein the infrared imaging camera has an alarm function of abnormal temperature rise, and an abnormal temperature rise threshold is set, When the abnormal temperature rise exceeds the abnormal temperature rise threshold, an abnormal temperature rise alarm is issued, the insulator to be tested corresponding to the abnormal temperature rise alarm is unqualified, and the insulator to be tested corresponding to no abnormal temperature rise alarm is qualified; The viewing angle of the infrared imaging camera should be enough to make all the insulators to be tested be reflected in it. 3. the test platform for composite insulator tape sheath mandrel water diffusion test according to claim 1, is characterized in that: described display shows several microammeters of insulators to be tested-time line graph, and has sound and light alarm Function, if the current value of the insulator to be tested keeps rising with time, the display will send out an audible and visual alarm corresponding to the numbered sub-window. The insulator to be tested corresponding to the sound and light alarm is judged to be unqualified, and the insulator to be tested corresponding to the sound and light alarm is not qualified. 4 . The test platform for water diffusion test of composite insulator sheathed mandrels according to claim 1 , wherein the installation place of the infrared imaging camera adopts insulating material. 5 . 5 . The test platform for water diffusion test of composite insulator sheathed mandrels according to claim 1 , wherein the high-voltage lead input end of the test platform and the installation places of several high-voltage lead output ends adopt insulating material. 6 . 6. The test platform for composite insulator tape sheathed mandrel water diffusion test according to claim 1, characterized in that: the upper pole plate and the lower pole plate constitute a movable pole plate for fixing the insulator to be tested, The lower pole plate is installed with insulating material to prevent current from flowing into the ground and affecting the test results. 7. The test platform for the water diffusion test of composite insulators with sheathed mandrels according to claim 6, wherein the upper plate and the lower plate constitute a capacitor, and the voltage divider has a voltmeter, It is used to accurately measure the load voltage and reduce the influence of the capacitance rise effect by adjusting the voltage.

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