A method for testing a tree fault model

Abstract

The present application relates to a kind of tree fault real model test methods, comprising the following steps: starting distribution network real model test system, control lap joint point is connected, until tree burns out or fault disappears or open fire distance ground reaches preset threshold when closing distribution network real model test system;Data acquisition system collects the electrical quantity data of distribution network real model test system in the test process and the image data of the tree to be measured;After the electrical quantity data and the image data are preprocessed, they are combined into tree fault data, and the tree fault characteristics are obtained by analyzing the tree fault data.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of tree fault real test method, belong to power system fault test technical field. BACKGROUND

[0002] Tree fault is a kind of grounding fault that is common in distribution network and has potential hazards. Tree fault occurs when power lines come into contact with the surrounding environment (such as trees, vegetation), which can cause line short circuit, equipment damage, and even cause fire and other serious consequences, endangering the stability and reliability of the power system.

[0003] Currently, the test method for tree fault mainly relies on digital simulation model. This kind of model is based on theoretical analysis and computer simulation, which simulates the contact between power lines and external objects, extracts the characteristics of tree fault, and proposes detection and processing methods. This kind of model often cannot accurately reflect the complex physical process and environmental changes in real scene, such as the influence of tree height, diameter, tree species, contact conditions with power lines and other factors. SUMMARY

[0004] To solve the problems existing in the prior art, the present application provides a tree fault real test method.

[0005] The technical solution of the present application is as follows:

[0006] On the one hand, the present application provides a tree fault real test method, which includes the following steps:

[0007] Start the distribution network real test system, control the overlap point to be connected until the tree burns out or the fault disappears or the distance between the fire and the ground reaches the preset threshold, then shut down the distribution network real test system;

[0008] The data acquisition system collects electrical quantity data of the distribution network real test system and image data of the tree to be tested during the test;

[0009] After pre-processing the electrical quantity data and image data, combine them into tree fault data, and analyze the tree fault data to obtain the characteristics of tree fault.

[0010] As a preferred embodiment of the present application, the test tree is of a tree species that is representative of the region, and the height of the main stem of the test tree is not less than a preset value, only the root ball, the main stem and the branches above the main branch nodes within a fixed range are retained.

[0011] As a preferred embodiment of the present application, the test area is provided with a tree planting area, and a plurality of tree planting holes with a preset diameter and depth are dug in the tree planting area for planting test trees.

[0012] As a preferred embodiment of the present application, the overlap mode of the overlap point includes:

[0013] The conductor is directly overlapped to the tree to be tested for simulating single-phase grounding tree fault;

[0014] The conductor is overlapped to the tree to be tested by the way of cross-putting branch for simulating phase-to-phase short circuit fault.

[0015] As a preferred embodiment of the present application, the power distribution network real model test system comprises a transformer, a grounding transformer, a high-voltage cabinet, an arc suppression coil, grounding equipment and a fault line, and is used for simulating a 10kV power distribution network system.

[0016] As a preferred embodiment of the present application, the data acquisition system comprises a three-phase five-column voltage transformer, a core-penetrating current transformer, an acquisition card, a visible light camera, a motion camera, an infrared thermal imager and a high-resolution camera.

[0017] The three-phase five-column voltage transformer is connected with the power distribution network real model test system, and is used for converting three-phase voltage and zero sequence voltage of the power distribution network real model test system into collectable secondary signals.

[0018] The core-penetrating current transformer is installed before and after the overlapping point of the fault line and at the connection position of the fault line and the transformer, and is used for converting fault point current and feeder zero sequence current of the power distribution network real model test system into collectable secondary signals.

[0019] The acquisition card is connected with the three-phase five-column voltage transformer and the core-penetrating current transformer respectively, and is used for collecting secondary signals of the three-phase five-column voltage transformer and the core-penetrating current transformer.

[0020] The visible light camera, the motion camera, the infrared thermal imager and the high-resolution camera are all provided with multiple cameras, and are simultaneously arranged at preset positions, and are used for collecting different types of image data.

[0021] On the other hand, the present application also provides an electronic device, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the method according to any one of the embodiments of the present application when executing the program.

[0022] In another aspect, the present application also provides a computer readable storage medium, which stores a computer program, wherein the program is executable on a processor to implement the method according to any one of the embodiments of the present application.

[0023] The present application has the following beneficial effects:

[0024] 1. The present application provides a tree fault real model test method, which can make up for the shortcomings of the existing digital simulation model, simulate the tree fault process, extract effective features of the power system tree fault, and facilitate the detection and processing of such faults. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 For the method flowchart of the present application;

[0026] Figure 2 For the structure schematic diagram of the power distribution network true type test system of the present application. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work under the premise that the embodiments in the present application fall within the scope of protection of the present application.

[0028] It should be understood that the step numbers used herein are only for the convenience of description, and are not limited to the execution sequence of the steps.

[0029] It should be understood that the terms used in the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the present application specification and the appended claims, unless otherwise clearly indicated by the context, the singular forms "a", "an" and "the" are intended to include the plural forms.

[0030] The terms "comprise" and "include" indicate the presence of described features, whole, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, whole, steps, operations, elements, components and / or sets thereof.

[0031] The term "and / or" means any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0032] Embodiment one:

[0033] Referring to Figure 1 A tree fault true type test method, comprising the following steps:

[0034] Planting the test trees into the tree planting area of the test site (selecting a representative and safe test site, simulating the conditions of terrain, climate and the like according to the test requirements), and configuring a power distribution network true type test system and a data acquisition system in the test site;

[0035] From the grounding device in the configured power distribution network true type test system, a wire about 5m long (the length is at least 5m) is connected out and is overlapped to the tree to be tested according to a preset overlapping mode;

[0036] The power distribution network real test system is started, the overlap point is connected until the tree is burned out or the fault disappears or the open fire distance from the ground reaches the preset threshold, the power distribution network real test system is closed, the tree species and test parameters can be adjusted according to the single test result, and multiple tests can be repeatedly performed;

[0037] After the test is completed, the line is checked by a professional operator, and other test personnel can enter the test area after discharge, and the data acquisition system collects electrical quantity data of the power distribution network real test system and image data of the tree to be tested during the test process;

[0038] After the electrical quantity data and the image data are preprocessed, they are combined into tree collision fault data, and basic features of the tree collision fault data are extracted, such as three-phase voltage, zero-sequence voltage, amplitude change of line zero-sequence current during tree collision, harmonic component change, texture feature of the tree after the tree collision fault, carbonization path feature and the like;

[0039] The stages can be distinguished according to the spread range of the flame or the change of the electrical quantity after the tree collision fault occurs, and the rules of each stage are summarized, such as the zero-sequence current and the zero-sequence voltage of the line in the initial stage of the tree collision, the stage of appearing open fire and the stage of complete ignition.

[0040] According to the rules of each stage, the tree collision fault influence is summarized and evaluated, and suggestions or opinions for detection and processing of the tree collision fault and optimization adjustment of the protection equipment are given;

[0041] The above test method can select tree species, set fault conditions according to actual needs, simulate the tree collision fault process under different conditions, and adapt to different test requirements.

[0042] As a preferred embodiment of the present embodiment, the selection of tree species needs to be combined with the actual situation, the test tree is a tree species with regional representation, and the height of the main stem of the test tree is not less than 3m, the diameter of the tree is determined according to the tree species, multiple trees of a single species are prepared, and only the root soft soil ball, the main stem and the branches above the main branch node within the range of 0.2-0.3m of the test tree are reserved to simulate the state of the tree in the natural environment.

[0043] As a preferred embodiment of the present embodiment, a plurality of tree planting pits with a diameter of about 1m and a depth of about 1m are dug in the tree planting area for planting test trees and filling, compacting and watering, at the same time, a safety isolation area is set, the safety distance is set to 30m to ensure the safety of the test process, warning signs and fences are set around the site to prevent non-test personnel from entering. Safety operation procedures and emergency plans are formulated, and safety training is conducted for personnel participating in the test. Professional safety equipment and protective articles such as insulating gloves, safety hats and protective clothing are provided during the test. Equipment inspection and test run are performed before the test to ensure that the equipment is in good condition.

[0044] As a preferred embodiment of the present embodiment, the preset lapping mode includes:

[0045] The wires are directly lapped to the trees to be tested through the insulating support (height adjustable) to ensure good and firm contact, which is used to simulate single-phase grounding tree collision fault;

[0046] The wires are lapped to the trees to be tested by crossing the branches between the phases, which is used to simulate phase-to-phase short circuit fault;

[0047] By controlling the contact position and distance of the lead-out wires with the trees, the tree collision fault under different conditions is simulated to provide diversified fault simulation conditions for the test.

[0048] As a preferred embodiment of the present embodiment, see Figure 2 , the distribution network real test system includes a transformer, a grounding transformer, a high-voltage cabinet, an arc suppression coil, and grounding equipment, which is used to simulate a 10kV distribution network system;

[0049] The transformer can stably output three-phase 10kV line voltage; the grounding transformer is used to generate the neutral point of the system; the high-voltage cabinet contains a π structure and a circuit breaker, the π structure is composed of high-voltage inductors, resistors and capacitors, and different impedance combinations of devices simulate high-voltage distribution lines of different lengths, and the circuit breaker can switch the simulated line; the arc suppression coil device is connected to the neutral point of the grounding transformer, and its switching can change the grounding mode of the neutral point of the system; the fault line is simulated by overhead lines, the π structure is connected at different positions of the line, and multiple simulated fault points are set; the grounding equipment is movable, connected to any simulated fault point of the fault line, and contains a controlled switch, which controls any phase of the simulated fault point through different transition resistors.

[0050] As a preferred embodiment of the present embodiment, the data acquisition system includes a three-phase five-column voltage transformer, a core-penetrating current transformer, an AD7606 acquisition card (sampling frequency not less than 10kHz) for real-time acquisition of three-phase voltage, zero sequence voltage, fault point current, feeder zero sequence current, visible light camera, motion camera, infrared thermal imager and high-resolution camera for multi-angle shooting and recording the change process of the whole plant from power-on to power-off and the wire image and tree carbonization trace after power-off, and multiple data acquisition points are set;

[0051] The three-phase five-column voltage transformer is connected with the distribution network real test system, which is used to convert the three-phase voltage and zero sequence voltage of the distribution network real test system into collectable secondary signals;

[0052] The core-penetrating current transformer is installed before and after the lapping point of the fault line and at the connection between the fault line and the transformer, which is used to convert the fault point current and feeder zero sequence current of the distribution network real test system into collectable secondary signals;

[0053] The AD7606 acquisition card is connected with the three-phase five-column voltage transformer and the core-penetrating current transformer respectively, and is used for collecting secondary signals of the three-phase five-column voltage transformer and the core-penetrating current transformer.

[0054] The visible light camera, the motion camera, the infrared thermal imager and the high-resolution camera are all provided in plurality, and are simultaneously arranged at the preset positions, and are used for collecting different types of image data.

[0055] In particular, the ground fault line selection device is installed, three-phase voltage, zero sequence voltage and zero sequence current of each line are collected, the protection device and the fault positioning device are installed at the front end of the fault line and the positions before and after the simulated fault point, and other high-voltage protection devices can be added according to requirements.

[0056] Embodiment two:

[0057] The embodiment provides an electronic device, including a memory, a processor and a computer program stored in the memory and executable on the processor, and the processor implements the method in any embodiment of the application when executing the program.

[0058] Embodiment three:

[0059] The embodiment provides a computer readable storage medium, and the computer program is stored in the computer readable storage medium, and the program is executed by the processor to implement the method in any embodiment of the application.

[0060] In the embodiments of the present application, "at least one" means one or more, and "multiple" means two or more. "And / or" describes the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B, which means that A exists alone, A and B exist together, and B exists alone. Wherein A and B can be singular or plural. The character " / " generally represents that the front and rear associated objects are in an "or" relationship. "At least one of the following" and the like means any combination of these items, including any combination of single or multiple items. For example, at least one of a, b and c can represent: a, b, c, a and b, a and c, b and c, or a and b and c, wherein a, b and c can be single or multiple.

[0061] Those skilled in the art can realize that the units and algorithm steps described in the embodiments disclosed in the present application can be realized by electronic hardware, computer software and combination of electronic hardware and computer software. Whether the functions are realized by hardware or software depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0062] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the system, device and unit described above can refer to the corresponding processes in the foregoing method embodiments, and will not be described here.

[0063] In several embodiments provided in the present application, any function realized in the form of a software function unit and sold or used as an independent product can be stored in a computer-readable storage medium. Based on such understanding, the technical solutions of the present application essentially or the parts of the technical solutions that make contributions to the prior art or the parts of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium, includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the embodiments of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (Read-Only Memory; hereinafter referred to as: ROM), a random access memory (Random Access Memory; hereinafter referred to as: RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0064] The above only describes the embodiments of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, which is made by using the content of the specification and drawings of the present application, is also included in the patent protection scope of the present application.

Claims

1. A method for conducting a realistic test of tree collision failure, characterized in that, Includes the following steps: Start the power distribution network simulation test system, control the connection of the junction point, and shut down the power distribution network simulation test system when the tree is burned down, the fault disappears, or the open flame reaches the preset threshold from the ground. The data acquisition system collects electrical quantity data from the power grid real-type test system and image data of the trees under test during the experiment. After preprocessing, electrical quantity data and image data are combined to form tree collision fault data. The tree collision fault data is then analyzed to obtain the tree collision fault characteristics. The overlapping methods of the overlapping points include: The wires are directly connected to the tree to be tested to simulate a single-phase grounding fault to the tree. The conductors are connected to the tree under test by laying branches across each phase to simulate a phase-to-phase short circuit fault. The data acquisition system includes a three-phase five-column voltage transformer, a through-core current transformer, a data acquisition card, a visible light camera, a motion camera, an infrared thermal imager, and a high-resolution camera. The three-phase five-limb voltage transformer is connected to the distribution network full-scale test system and is used to convert the three-phase voltage and zero-sequence voltage of the distribution network full-scale test system into collectable secondary signals. The through-core current transformer is installed before and after the fault line connection point and at the connection point between the fault line and the transformer. It is used to convert the fault point current and feeder zero-sequence current of the distribution network real-type test system into collectable secondary signals. The acquisition card is connected to the three-phase five-limb voltage transformer and the through-core current transformer respectively, and is used to acquire the secondary signals of the three-phase five-limb voltage transformer and the through-core current transformer. The visible light camera, action camera, infrared thermal imager, and high-resolution camera are all provided in multiple units and are simultaneously set in preset positions to collect different types of image data.

2. The tree collision failure simulation test method according to claim 1, characterized in that, The test trees are regionally representative tree species, and the trunk height of the test trees is not lower than the preset value. Only the soft soil ball at the root, the trunk, and the branches within a range of 0.2~0.3m above the main branch nodes are retained.

3. The tree collision failure simulation test method according to claim 1, characterized in that, The experimental area includes a tree planting area, in which several planting pits of predetermined diameter and depth are dug for planting experimental trees.

4. The tree collision failure simulation test method according to claim 1, characterized in that, The power distribution network simulation test system consists of a transformer, a grounding transformer, a high-voltage switchgear, an arc suppression coil, grounding equipment, and a faulty line, and is used to simulate a 10kV power distribution network system.

5. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the method as described in any one of claims 1 to 4.

6. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the method as described in any one of claims 1 to 4.

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