Energy consumption type multi-column parallel lightning arrester

Abstract

The invention discloses an energy-consuming multi-column parallel lightning arrester, which is characterized in that a plurality of resistor discs of the lightning arrester are connected in parallel, and the lightning arrester comprises a plurality of rows of parallel combinations generated by the plurality of resistor discs; the plurality of resistance sheets in each parallel combination in the plurality of parallel combinations are connected in series in a layered manner according to a preset layer number, and the lightning arrester comprises a plurality of series branches; and each series branch of the lightning arrester is connected in series with a fuse. According to the energy consumption type multi-column parallel lightning arrester provided by the invention, the fault rate of the lightning arrester can be reduced, or fault parts can be short-circuited, so that system shutdown caused by tripping or locking is avoided, and the reliability of a power transmission system is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of direct current power transmission systems, and more specifically, to an energy-consuming multi-column parallel lightning arrester. Background Art

[0002] Energy-consuming multi-column parallel arresters are widely used in DC converter stations, AC series compensation devices and other fields. Their main function is to absorb redundant energy in the system and limit overvoltage. However, due to the large number of parallel columns, the failure rate of this type of arrester has always been high.

[0003] Traditional energy-consuming multi-column parallel arresters generally adopt a "series first, then parallel" structure, and each column resistor is directly connected in parallel with the protected equipment. The advantages of this structure are simple structure, easy installation and low cost. However, its disadvantages are also obvious: when any column defect fails, it will directly short-circuit the protected equipment, causing the AC system to trip and the DC system to lock, seriously affecting the system power supply reliability.

[0004] Arrester action current monitoring is one of the main means of operation, maintenance and inspection of multi-column parallel arresters. However, for many years, there have been problems such as unreasonable defect warning criteria and poor actual effect, and relevant issues have not been effectively resolved. Summary of the invention

[0005] The technical solution of the present invention provides an energy-consuming multi-column parallel arrester to solve the problem that the multi-column parallel arrester has a high failure rate, causes tripping or locking, and causes the power transmission system to stop operating.

[0006] In order to solve the above problems, the present invention provides an energy-consuming multi-column parallel arrester, which is characterized by comprising:

[0007] The multiple resistors of the arrester are connected in parallel, and the arrester comprises a plurality of resistors that are connected in parallel in multiple columns;

[0008] The plurality of barriers in each parallel combination of the plurality of parallel combinations are connected in series in layers according to a preset number of layers, and the arrester comprises a plurality of series branches;

[0009] Each series branch of the arrester is connected in series with a fuse.

[0010] Preferably, it is characterized by comprising:

[0011] The operating current of each series-connected branch is measured by a current sensor.

[0012] Preferably, it is characterized by comprising:

[0013] The current sensor measures the current sharing coefficient at any time when the average current is greater than 10A, and sends a defect warning signal when the measured current sharing coefficient at any time is greater than the factory setting value of 0.5 and lasts for 1ms.

[0014] Preferably, it is characterized by comprising:

[0015] The current sensor measures the current sharing coefficient at any time when the average current is greater than 10A, and issues a defect warning signal when the current sharing coefficient at the current peak is greater than the factory setting value of 0.5.

[0016] Preferably, it is characterized by comprising:

[0017] The current sensor measures the current sharing coefficient at any time when the average current is greater than 10A, and sends a defect warning signal when the current sharing coefficient is greater than 5 in the current decreasing stage.

[0018] Preferably, it is characterized by comprising:

[0019] When the current sensor measures that there is an obvious sudden change or abnormality in the current waveform of any series branch action current, a defect warning signal is issued.

[0020] Preferably, it is characterized by comprising:

[0021] After each action of the arrester, when it is not energized for the first time, the insulation resistance of each layer of series branches of the arrester is measured. When the insulation resistance of a layer of series branches is less than 2500MΩ, it is determined that there is a faulty component in the arrester on the layer where the series branches are located.

[0022] Preferably, it is characterized by comprising:

[0023] The DC reference voltage of each layer of the series branches of the arrester is measured. When the DC reference voltage of a layer of series branches drops by more than 5%, it is determined that there is a faulty component in the arrester of the layer where the series branches are located.

[0024] Preferably, it is characterized by comprising:

[0025] The multiple barriers in each parallel combination of the multiple parallel combinations are layered and connected in series according to a preset number of layers, wherein the number of layers is at least 3 layers.

[0026] Preferably, it is characterized by comprising:

[0027] The fuse can reliably withstand a normal impulse current with a duration of 50ms and an amplitude not greater than 400A;

[0028] The fuse can be reliably blown under a normal impulse current with a duration of 50ms and an amplitude of not less than 2000A;

[0029] After the fuse is actuated, it can reliably withstand a normal impulse voltage with a duration of 50ms and an amplitude not greater than 150kV.

[0030] The technical solution of the present invention provides an energy-consuming multi-column parallel arrester, characterized in that it includes: multiple resistors of the arrester are connected in parallel, and the arrester includes multiple parallel combinations of multiple resistors; multiple resistors in each parallel combination of the multiple parallel combinations are layered and connected in series according to a preset number of layers, and the arrester includes multiple series branches; each series branch of the arrester is connected in series with a fuse. The present invention proposes a method that can reduce the failure rate of the arrester or short-circuit the faulty components, thereby avoiding system shutdown caused by tripping or locking, and improving the reliability of the power transmission system. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] A more complete understanding of exemplary embodiments of the present invention may be obtained by referring to the following drawings:

[0032] Figure 1 The structure diagram of an energy-consuming multi-column parallel lightning arrester according to a preferred embodiment of the present invention is shown. DETAILED DESCRIPTION

[0033] Now, exemplary embodiments of the present invention are described with reference to the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely and to fully convey the scope of the present invention to those skilled in the art. The terms used in the exemplary embodiments shown in the accompanying drawings are not intended to limit the present invention. In the accompanying drawings, the same units / elements are marked with the same reference numerals.

[0034] Unless otherwise specified, the terms (including technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it is understood that the terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.

[0035] Figure 1 The structure diagram of an energy-consuming multi-column parallel lightning arrester according to a preferred embodiment of the present invention is shown.

[0036] like Figure 1 As shown, the present invention provides an energy-consuming multi-column parallel arrester, characterized in that it includes:

[0037] The multiple resistors of the arrester are connected in parallel, and the arrester includes a plurality of resistors that are connected in parallel in multiple columns;

[0038] Preferably, it includes:

[0039] The multiple barriers in each parallel combination of the multiple parallel combinations are layered and connected in series according to a preset number of layers, wherein the number of layers is at least 3 layers.

[0040] The arrester of the present invention adopts a layered structure. The present invention adopts a layered series-parallel structure as a whole, first parallel and then series; the number of layers m≥3, determined by the reference voltage and energy; the number of columns n is appropriately increased, determined by the energy.

[0041] If there is a defective resistor, the component where the defective resistor is located will be short-circuited when a fault occurs, and the remaining (m-1) layers will assume all the functions of the lightning arrester. The system does not need to trip / shut down and can pass through the overvoltage normally.

[0042] The technical parameters such as the design energy of (m-1) layers*(n-1) columns of the present invention are not less than the engineering requirements, that is, the energy margin is not less than m*n / (m-1)*(n-1) during normal operation.

[0043] There are many hot spares, and faulty components can be removed after inspection or monitoring.

[0044] The multiple barriers in each parallel combination of the multiple parallel combinations are connected in series in layers according to a preset number of layers, and the lightning arrester includes multiple series branches;

[0045] Each series branch of the lightning arrester is connected in series with a fuse.

[0046] Preferably, it includes:

[0047] The operating current of each series-connected branch is measured by a current sensor.

[0048] Preferably, it includes:

[0049] The current sensor measures the current sharing coefficient at any time when the average current is greater than 10A. When the measured current sharing coefficient at any time is greater than the factory setting value of 0.5 and lasts for 1ms, a defect warning signal is issued.

[0050] Preferably, it includes:

[0051] The current sensor measures the current sharing coefficient at any time when the average current is greater than 10A. When the current sharing coefficient at the current peak is greater than the factory setting value of 0.5, a defect warning signal is issued.

[0052] Preferably, it includes:

[0053] The current sensor measures the current sharing coefficient at any time when the average current is greater than 10A, and issues a defect warning signal when the current sharing coefficient is greater than 5 during the current decreasing stage.

[0054] Preferably, it includes:

[0055] When the current sensor measures that there is an obvious sudden change or abnormality in the current waveform of any series branch operating current, a defect warning signal is issued.

[0056] The present invention also proposes a warning criterion for detecting defects in operating current of multi-column parallel lightning arresters.

[0057] The present invention monitors the operating current of the energy-consuming multi-column parallel arrester:

[0058] It should be possible to measure the operating current of each component (series branch) to improve the monitoring sensitivity; it is not possible (according to traditional practices) for multiple parallel components to share one current sensor.

[0059] The consistency of the measurement results is no more than 5%.

[0060] The current sharing coefficient at any time when the average current is greater than 10A and above should be given. A defect warning signal will be issued when the current sharing coefficient at any time is greater than the factory value of 0.5 and lasts for 1ms.

[0061] The current averaging coefficient at any time when the average current is greater than 10A and above should be given. A defect warning signal will be issued when the current averaging coefficient at the current peak is greater than the factory value of 0.5.

[0062] When the current sharing coefficient is greater than 5 during the current decreasing phase, a suspected defect warning signal is issued.

[0063] When the current waveform of a column changes obviously / is abnormal, a defect warning signal is issued.

[0064] Preferably, it includes:

[0065] After each action of the arrester, when it is not energized for the first time, measure the insulation resistance of each layer of series branches of the arrester. When the insulation resistance of one layer of series branches is less than 2500MΩ, it is determined that there is a faulty component in the arrester on the layer where the series branches are located.

[0066] Preferably, it includes:

[0067] The DC reference voltage of each layer of series branches of the lightning arrester is measured. When the DC reference voltage of one layer of series branches drops by more than 5%, it is determined that there is a faulty component in the lightning arrester of the layer where the series branches are located.

[0068] The present invention provides a power outage maintenance method:

[0069] After each operation of the lightning arrester, routine inspection should be carried out to observe whether there is any abnormality in the appearance of the lightning arrester.

[0070] After each operation of the arrester, when it is not energized for the first time, measure the insulation resistance of each layer of arrester; when the insulation resistance is less than 2500MΩ, it can be determined that there is a faulty component in the arrester of this layer.

[0071] The DC reference voltage test shall be carried out at least once a year. When the DC reference voltage drops by more than 5%, it can be determined that there is a faulty component in the lightning arrester on that layer.

[0072] Preferably, it includes:

[0073] The fuse can reliably withstand normal impulse current with a duration of 50ms and an amplitude not greater than 400A;

[0074] The fuse can be reliably melted under normal impulse current with a duration of 50ms and an amplitude of not less than 2000A;

[0075] After the fuse is operated, it can reliably withstand normal impulse voltage with a duration of 50ms and an amplitude not exceeding 150kV.

[0076] The present invention provides backup protection through fuses, and each lightning arrester element of the present invention is connected in series with a fuse.

[0077] The fuse should be able to reliably withstand normal impulse current with a duration of 50ms and an amplitude not greater than 400A.

[0078] The fuse should be able to melt reliably under normal impulse current with a duration of 50ms and an amplitude of not less than 2000A.

[0079] After the fuse is operated, it should be able to reliably withstand a normal impulse voltage with a duration of 50ms and an amplitude not exceeding 150kV.

[0080] The present invention proposes an energy-consuming multi-column parallel arrester and an operating current monitoring system thereof, which can solve the problem that the energy-consuming multi-column parallel arrester has a high failure rate and the failure will inevitably lead to tripping or locking, resulting in system shutdown.

[0081] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes. The schemes in the embodiments of the present invention may be implemented in various computer languages, for example, object-oriented programming language Java and literal scripting language JavaScript, etc.

[0082] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0083] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0084] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0085] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0086] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

[0087] The invention has been described above with reference to a few embodiments. However, it is readily apparent to a person skilled in the art that other embodiments than the ones disclosed above are equally within the scope of the invention, as defined by the appended patent claims.

[0088] Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a / said / the [means, components, etc.]" are to be openly interpreted as at least one instance of the means, components, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not necessarily have to be performed in the exact order disclosed, unless explicitly stated otherwise.

Claims

1. An energy-consuming multi-column parallel arrester, characterized in that: include: The multiple resistors of the arrester are connected in parallel, and the arrester comprises a plurality of resistors that are connected in parallel in multiple columns; The plurality of barriers in each parallel combination of the plurality of parallel combinations are connected in series in layers according to a preset number of layers, and the arrester comprises a plurality of series branches; Each series branch of the arrester is connected in series with a fuse.

2. The energy-consuming multi-column parallel arrester according to claim 1 is characterized in that: include: The operating current of each series-connected branch is measured by a current sensor.

3. The energy-consuming multi-column parallel arrester according to claim 2 is characterized in that: include: The current sensor measures the current sharing coefficient at any time when the average current is greater than 10A, and sends a defect warning signal when the measured current sharing coefficient at any time is greater than the factory setting value of 0.5 and lasts for 1ms.

4. The energy-consuming multi-column parallel arrester according to claim 2 is characterized in that: include: The current sensor measures the current sharing coefficient at any time when the average current is greater than 10A, and issues a defect warning signal when the current sharing coefficient at the current peak is greater than the factory setting value of 0.

5.

5. The energy-consuming multi-column parallel arrester according to claim 2 is characterized in that: include: The current sensor measures the current sharing coefficient at any time when the average current is greater than 10A, and sends a defect warning signal when the current sharing coefficient is greater than 5 in the current decreasing stage.

6. The energy-consuming multi-column parallel arrester according to claim 2 is characterized in that: include: When the current sensor measures that there is an obvious sudden change or abnormality in the current waveform of any series branch action current, a defect warning signal is issued.

7. The energy-consuming multi-column parallel arrester according to claim 1 is characterized in that: include: After each action of the arrester, when it is not energized for the first time, the insulation resistance of each layer of series branches of the arrester is measured. When the insulation resistance of a layer of series branches is less than 2500MΩ, it is determined that there is a faulty component in the arrester on the layer where the series branches are located.

8. The energy-consuming multi-column parallel arrester according to claim 1 is characterized in that: include: The DC reference voltage of each layer of the series branches of the arrester is measured. When the DC reference voltage of a layer of series branches drops by more than 5%, it is determined that there is a faulty component in the arrester of the layer where the series branches are located.

9. The energy-consuming multi-column parallel arrester according to claim 1, characterized in that: include: The multiple barriers in each parallel combination of the multiple parallel combinations are layered and connected in series according to a preset number of layers, wherein the number of layers is at least 3 layers.

10. The energy-consuming multi-column parallel arrester according to claim 1, characterized in that: include: The fuse can reliably withstand a normal impulse current with a duration of 50ms and an amplitude not greater than 400A; The fuse can be reliably blown under a normal impulse current with a duration of 50ms and an amplitude of not less than 2000A; After the fuse is actuated, it can reliably withstand a normal impulse voltage with a duration of 50ms and an amplitude not greater than 150kV.

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