CN219201771U - Automatic insulation resistance measuring device for high-voltage insulator - Google Patents
Automatic insulation resistance measuring device for high-voltage insulator Download PDFInfo
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Abstract
The utility model discloses an automatic measuring device for insulation resistance of a high-voltage insulator, which comprises: the direct-current high-voltage generator and the high-voltage capacitor form a charging loop, and the charging loop is used for outputting direct-current high voltage to the high-voltage capacitor so as to charge the high-voltage capacitor; wherein, at this time, the high-voltage switch is in an off state; the high-voltage capacitor, the high-voltage divider, the current transformer and the measured high-voltage insulator form a discharge loop, and the discharge loop is used for performing RC discharge when the high-voltage generator is in a closed state and the high-voltage switch is in a closed state; the high-voltage divider is connected with the measurement and control module and is used for dividing voltages during charging and discharging respectively, acquiring a first divided voltage signal and a second divided voltage signal respectively, and inputting the first divided voltage signal and the second divided voltage signal to the measurement and control module respectively; and the measurement and control module is used for determining the insulation resistance of the measured high-voltage insulator based on the first voltage division signal and the second voltage division signal.
Description
Technical Field
The utility model relates to the technical field of high-voltage insulator detection, in particular to an automatic insulation resistance measuring device for a high-voltage insulator.
Background
In the operation equipment of the power system, the insulators are the most widely distributed and most abundant insulation equipment, and the zero value of the insulators is common and has multiple faults, and in long-term operation, the insulators are influenced by severe natural environment factors such as lightning strokes, pollution, bird damage, ice and snow, high temperature, temperature difference and the like; the electric power is subjected to the actions of a strong electric field, lightning impulse current and power frequency arc current; mechanical forces such as long-term working load, comprehensive load, wire galloping and the like are born mechanically. When the neck of the insulator porcelain has defects such as micro-pores and the like or cracks appear in operation, the insulation resistance of the insulator can be greatly reduced, and a low-value insulator or a zero-value insulator appears. Once the insulator has a low zero defect, its ability to withstand voltage is greatly reduced. When a certain proportion of low-value or zero-value insulators exist in the insulator string, flashover accidents are easy to occur under the pollution environment, overvoltage and even working voltage. When lightning overvoltage acts on the low zero-value insulator, the low zero-value insulator is easy to break down completely, strong lightning current and power frequency follow current flow through a porcelain gap at the head part of the zero-value insulator, and the low zero-value insulator is caused to be overheated and fried open, so that the line is caused to fall. Therefore, the low-zero-value insulator is a hidden danger causing major accidents of the power transmission line, and seriously threatens the safe operation of the power system.
In recent years, new methods for detecting zero-value insulators are continuously explored at home and abroad. From analysis of the characteristics of deterioration and the cause of deterioration of an insulator, it is known that the deteriorated insulator is different from the good insulator in various aspects such as electrical performance, partial discharge, and temperature distribution. Starting from these differences, a series of degraded insulator detection methods can be derived, which are largely divided into two categories: one type of non-contact detection method and the other type of contact detection method. The non-contact detection method mainly comprises an ultrasonic detection method, a laser Doppler vibration method, an infrared temperature measurement method, a corona camera method, a radio wave detection method and the like. The non-contact detection method has the advantages of no direct contact with the measured object and no trouble of high-voltage insulation, so that the method is safer, but in specific application, various auxiliary equipment is needed, so that the detection cost is higher. The detection equipment and the detected object are more or less affected by external environmental factors, and the detection equipment is imperfect and has errors of manual operation in the use process, so that the detection equipment and the detected object have certain difficulty in wide application. The contact detection method mainly comprises an alternating current bypass measuring resistance method, a voltage distribution method, a leakage current detection method, a pulse current detection method, an insulation resistance detection method and the like according to the working principle, and the direct detection method is used for measuring the partial deteriorated insulator in a inaccurate measurement mode, and the measured value is not quantized and is invisible because the voltage acted on the insulator by the direct detection method is not high enough.
Therefore, there is a need for an automatic insulation resistance measuring device for high voltage insulators.
Disclosure of Invention
The utility model provides an automatic measuring device for the insulation resistance of a high-voltage insulator, which aims to solve the problem of how to efficiently and accurately measure the insulation resistance of the high-voltage insulator.
In order to solve the above-described problems, according to an aspect of the present utility model, there is provided an insulation resistance automatic measurement apparatus of a high-voltage insulator, the apparatus comprising: the measurement and control module is connected with the direct current high-voltage generator, the high-voltage capacitor, the high-voltage divider, the high-voltage switch and the measured high-voltage insulator in sequence; wherein,,
the direct current high voltage generator and the high voltage capacitor form a charging loop for outputting direct current high voltage to the high voltage capacitor so as to charge the high voltage capacitor; wherein, at this time, the high-voltage switch is in an off state;
the high-voltage capacitor, the high-voltage divider, the current transformer and the high-voltage insulator to be detected form a discharge loop, and the discharge loop is used for performing RC discharge when the high-voltage generator is in a closed state and the high-voltage switch is in a closed state;
the high-voltage divider is connected with the measurement and control module and is used for dividing voltage during charging and discharging respectively, obtaining a first divided voltage signal and a second divided voltage signal respectively, and inputting the first divided voltage signal and the second divided voltage signal to the measurement and control module respectively;
and the measurement and control module is used for determining the insulation resistance of the measured high-voltage insulator based on the first voltage division signal and the second voltage division signal.
Preferably, wherein the apparatus further comprises: and the power supply is respectively connected with the high-voltage generator and the measurement and control module and is used for supplying power to the device.
Preferably, the power supply is a portable rechargeable battery.
Preferably, wherein the high voltage generator is capable of generating a DC high voltage of 60 KV/125W; the charging voltage of the high-voltage capacitor is 60kV.
Preferably, the high voltage divider has a two-stage voltage dividing structure, wherein the one-stage voltage dividing is 1000mΩ, and the ratio of the two-stage voltage dividing is 1000:1, a step of; the secondary voltage division adopts 10MΩ resistor voltage division, and the voltage division ratio is 15:1.
preferably, wherein the apparatus further comprises:
the current transformer is respectively connected with the high-voltage divider, the high-voltage insulator to be detected and the measurement and control module, and is used for acquiring a current signal in a loop where the high-voltage insulator to be detected is located and outputting the current signal to the measurement and control module so that the measurement and control module judges whether a short circuit exists or not based on the current signal.
Preferably, the measurement and control module further includes:
and the touch screen display unit is used for displaying the voltage and current data in the test process.
Preferably, the measurement and control module further includes:
and the storage unit is used for storing the data and the test result in the test process.
The utility model provides an automatic measuring device for insulation resistance of a high-voltage insulator, which comprises: the direct-current high-voltage generator is used for outputting direct-current high voltage to the high-voltage capacitor so as to charge the high-voltage capacitor; wherein, at this time, the high-voltage switch is in an off state; the high-voltage capacitor is used for performing RC discharge when the high-voltage generator is in a closed state and the high-voltage switch is in a closed state; the high-voltage divider is used for dividing voltages during charging and discharging respectively, acquiring a first divided voltage signal and a second divided voltage signal respectively, and inputting the first divided voltage signal and the second divided voltage signal to the measurement and control module respectively; and the measurement and control module is used for determining the insulation resistance of the measured high-voltage insulator based on the first voltage division signal and the second voltage division signal. According to the device, a lightning impulse voltage generator principle is introduced into a measuring loop, and the automatic measurement of the insulation resistance of the high-voltage insulator is realized through a high-voltage pulse method, so that whether the insulator is qualified or not is judged through the resistance value of the edge resistance, and the high-efficiency and accurate measurement of the insulator resistance can be realized.
Drawings
Exemplary embodiments of the present utility model may be more completely understood in consideration of the following drawings:
fig. 1 is a schematic view of an insulation resistance automatic measuring apparatus 100 of a high voltage insulator according to an embodiment of the present utility model;
fig. 2 is a connection relation diagram of an insulation resistance automatic measuring apparatus of a high voltage insulator according to an embodiment of the present utility model;
FIG. 3 is a schematic diagram of a voltage testing circuit according to an embodiment of the present utility model;
fig. 4 is a graph of an insulator discharge according to an embodiment of the present utility model.
Detailed Description
The exemplary embodiments of the present utility model will now be described with reference to the accompanying drawings, however, the present utility model may be embodied in many different forms and is not limited to the examples described herein, which are provided to fully and completely disclose the present utility model and fully convey the scope of the utility model to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the utility model. In the drawings, like elements/components are referred to by like reference numerals.
Unless otherwise indicated, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, it will be understood that terms defined in commonly used dictionaries should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a schematic view of an automatic insulation resistance measuring apparatus 100 for a high-voltage insulator according to an embodiment of the present utility model. As shown in fig. 1, the insulation resistance automatic measurement device for the high-voltage insulator provided by the embodiment of the utility model introduces the principle of a lightning impulse voltage generator into a measurement loop, and realizes automatic measurement of the insulation resistance of the high-voltage insulator by a high-voltage pulse method so as to judge whether the insulator is qualified or not by the resistance value of the edge resistance, thereby realizing efficient and accurate measurement of the insulator resistance. The automatic insulation resistance measuring device 100 for a high-voltage insulator according to an embodiment of the present utility model includes: the measurement and control module 101 is connected with the direct current high-voltage generator 102, the high-voltage capacitor 103, the high-voltage divider 104, the high-voltage switch 105 and the measured high-voltage insulator 106 in sequence.
Preferably, the dc high voltage generator 102 and the high voltage capacitor form a charging loop, and is configured to output a dc high voltage to the high voltage capacitor to charge the high voltage capacitor; wherein, at this time, the high-voltage switch is in an off state.
Preferably, the high voltage capacitor 103, the high voltage divider, the current transformer and the measured high voltage insulator 106 form a discharge loop, and the discharge loop is used for performing RC discharge when the high voltage generator is in a closed state and the high voltage switch 105 is in a closed state.
Preferably, the high voltage divider 104 is connected to the measurement and control module, and is configured to divide voltages during charging and discharging, respectively, obtain a first voltage division signal and a second voltage division signal, and input the first voltage division signal and the second voltage division signal to the measurement and control module, respectively.
Preferably, the measurement and control module 101 is configured to determine an insulation resistance of the measured high voltage insulator based on the first voltage division signal and the second voltage division signal.
Preferably, wherein the apparatus further comprises: and the power supply is respectively connected with the high-voltage generator and the measurement and control module and is used for supplying power to the device.
Preferably, the power supply is a portable rechargeable battery.
Preferably, wherein the high voltage generator is capable of generating a DC high voltage of 60 KV/125W; the charging voltage of the high-voltage capacitor is 60kV.
Preferably, the high voltage divider has a two-stage voltage dividing structure, wherein the one-stage voltage dividing is 1000mΩ, and the ratio of the two-stage voltage dividing is 1000:1, a step of; the secondary voltage division adopts 10MΩ resistor voltage division, and the voltage division ratio is 15:1.
preferably, wherein the apparatus further comprises:
the current transformer is respectively connected with the high-voltage divider, the high-voltage insulator to be detected and the measurement and control module, and is used for acquiring a current signal in a loop where the high-voltage insulator to be detected is located and outputting the current signal to the measurement and control module so that the measurement and control module judges whether a short circuit exists or not based on the current signal.
Preferably, the measurement and control module determines the insulation resistance of the measured high voltage insulator based on the first voltage division signal and the second voltage division signal, and includes:
starting timing when the high-voltage capacitor discharges, acquiring a time t when the second partial pressure signal=the first partial pressure signal multiplied by 0.37, and calculating the insulation resistance according to R=t/C; wherein C is the capacitance of the high-voltage capacitor.
Preferably, the measurement and control module further includes: and the touch screen display unit is used for displaying the voltage and current data in the test process.
Preferably, the measurement and control module further includes: and the storage unit is used for storing the data and the test result in the test process.
Referring to fig. 2, the automatic insulation resistance measuring device for a high voltage insulator according to the present utility model includes: the device comprises a power supply, a direct-current high-voltage generator, a high-voltage capacitor, a high-voltage divider, a sample (namely a measured high-voltage insulator), a high-voltage switch, a current transformer and an embedded measurement and control system (namely a measurement and control module).
The power supply can adopt a portable rechargeable battery, and is respectively connected with the direct-current high-voltage generator and the embedded measurement and control system for supplying power to the device.
The direct current high voltage generator adopts a miniaturized high-integration direct current high voltage generator, can generate the direct current high voltage of 60KV/125W at most, and can adjust the output high voltage, thereby realizing the short circuit self-protection.
Wherein, 60KV high-voltage capacitor is used as charging and discharging medium, and 60KV high-voltage switch controls a discharging loop. During testing, the high-voltage generator generates 60KV high voltage to charge the capacitor, and after the capacitor is charged, the high-voltage generator is closed, the high-voltage switch is closed, and RC discharging is performed. The insulator resistor can be equivalent to a capacitor resistor parallel structure.
In the voltage/current sampling loop, the high-voltage divider is responsible for voltage sampling, and the primary voltage division is 1000MΩ, and the resistance-capacitance voltage division is 1000:1 partial pressure; the second-stage voltage division adopts 10MΩ resistance voltage division, 15: and 1, dividing the voltage, and then entering a high-speed analog-digital conversion channel of the embedded measurement and control system to perform voltage acquisition. Fig. 3 is a schematic diagram of the voltage test circuit. In the utility model, the high-voltage divider divides the voltage in the charging link and the discharging link, and respectively inputs a first voltage division signal and a second voltage division signal to the measurement and control system.
The current transformer is used for acquiring a current signal in a loop where the high-voltage insulator to be detected is located and outputting the current signal to the measurement and control module, so that the measurement and control module judges whether a short circuit exists or not based on the current signal. If a short circuit exists, the device is determined to be abnormal, and the resistance value is not calculated.
The embedded measurement and control system can adopt an ARM9 industrial processor and is provided with a color touch screen, the display is visual, the operation is simple and convenient, the portable requirements are met, and meanwhile, the embedded measurement and control system has the following characteristics: is convenient to carry and use; the operation is visual, and the current test state can be displayed in real time; test data and a real-time curve can be directly displayed; the measurement results can be analyzed in real time, and reports can be generated; test data statistics, etc. can be performed.
In the utility model, the device carries out millisecond-level rapid charge and discharge on the insulator through the high-voltage capacitor and the high-voltage generator, and forms steady-state high voltage with peak value of 60kV and attenuation of an RC circuit on the insulator. And during testing, the high-voltage generator generates 60KV high voltage to charge the capacitor, the high-voltage generator is closed to perform RC discharge after the capacitor is charged, and the measurement and control system calculates the equivalent impedance of the insulator according to the obtained voltage division signal.
In the utility model, when the high-voltage capacitor C discharges through R, the voltage on the high-voltage capacitor at any time t is as follows: vt=vu×exp (-t/RC), it can be derived from the above formula: when t=rc, vt=vu×0.37. Therefore, the measurement and control system continuously records Vt, and when vt=vu×0.37, t is recorded at this time, r=t/C can be calculated. Wherein t is the timing of discharge from the off high voltage; exp is an exponential function with e as the base; vu is a first divided signal, and is measured by a voltage divider; vt is the second voltage division signal at the time t, and is measured by a voltage divider.
Accordingly, in the present utility model, determining the insulation resistance of the high voltage insulator under test based on the first voltage division signal and the second voltage division signal includes:
starting timing when the high-voltage capacitor discharges, acquiring a time t when the second partial pressure signal=the first partial pressure signal multiplied by 0.37, and calculating the insulation resistance according to R=t/C; wherein C is the capacitance of the high-voltage capacitor.
For example, by testing an insulator of 100mΩ and measuring a discharge curve as shown in fig. 4, an actual measured resistance value of 105.6mΩ can be calculated by the above method.
The device can realize automatic measurement and calculation of the insulation resistance of the high-voltage insulator; meanwhile, the method has a stronger data post-processing function, can be used for recording and evaluating the impedance and the performance of the high-voltage insulator, and eliminates unqualified high-voltage insulators.
The utility model has been described with reference to a few embodiments. However, as is well known to those skilled in the art, other embodiments than the above disclosed utility model are equally possible within the scope of the utility model, as defined by the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise therein. All references to "a/an/the [ means, component, etc. ]" are to be interpreted openly as referring to at least one instance of said means, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In the description of the present utility model, terms of directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", etc., are based on the directions or positional relationships shown in the drawings, are merely for convenience of description, and do not indicate or imply that the apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those skilled in the art according to the specific circumstances.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present utility model and not for limiting the same, and although the present utility model has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the utility model without departing from the spirit and scope of the utility model, which is intended to be covered by the claims.
Claims (8)
1. An automatic insulation resistance measuring device for a high voltage insulator, the device comprising: the measurement and control module is connected with the direct current high-voltage generator, the high-voltage capacitor, the high-voltage divider, the high-voltage switch and the measured high-voltage insulator in sequence; wherein,,
the direct current high voltage generator and the high voltage capacitor form a charging loop for outputting direct current high voltage to the high voltage capacitor so as to charge the high voltage capacitor; wherein, at this time, the high-voltage switch is in an off state;
the high-voltage capacitor, the high-voltage divider, the current transformer and the high-voltage insulator to be detected form a discharge loop, and the discharge loop is used for performing RC discharge when the high-voltage generator is in a closed state and the high-voltage switch is in a closed state;
the high-voltage divider is connected with the measurement and control module and is used for dividing voltage during charging and discharging respectively, obtaining a first divided voltage signal and a second divided voltage signal respectively, and inputting the first divided voltage signal and the second divided voltage signal to the measurement and control module respectively;
and the measurement and control module is used for determining the insulation resistance of the measured high-voltage insulator based on the first voltage division signal and the second voltage division signal.
2. The apparatus of claim 1, wherein the apparatus further comprises: and the power supply is respectively connected with the high-voltage generator and the measurement and control module and is used for supplying power to the device.
3. The apparatus of claim 2, wherein the power supply is a portable rechargeable battery.
4. The apparatus of claim 1, wherein the high voltage generator is capable of generating a high dc voltage of 60 KV/125W; the charging voltage of the high-voltage capacitor is 60kV.
5. The apparatus of claim 1, wherein the high voltage divider has a two-stage voltage dividing structure, one stage of voltage dividing is 1000mΩ, and the ratio of the divided voltages is 1000:1, a step of; the secondary voltage division adopts 10MΩ resistor voltage division, and the voltage division ratio is 15:1.
6. the apparatus of claim 1, wherein the apparatus further comprises:
the current transformer is respectively connected with the high-voltage divider, the high-voltage insulator to be detected and the measurement and control module, and is used for acquiring a current signal in a loop where the high-voltage insulator to be detected is located and outputting the current signal to the measurement and control module so that the measurement and control module judges whether a short circuit exists or not based on the current signal.
7. The apparatus of claim 1, wherein the measurement and control module further comprises:
and the touch screen display unit is used for displaying the voltage and current data in the test process.
8. The apparatus of claim 1, wherein the measurement and control module further comprises:
and the storage unit is used for storing the data and the test result in the test process.
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| CN202320110913.3U CN219201771U (en) | 2023-01-17 | 2023-01-17 | Automatic insulation resistance measuring device for high-voltage insulator |
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| CN202320110913.3U CN219201771U (en) | 2023-01-17 | 2023-01-17 | Automatic insulation resistance measuring device for high-voltage insulator |
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