Equipment for testing power frequency discharge of lightning protection voltage limiter

Abstract

The utility model discloses a device for testing power frequency discharge of a lightning protection voltage limiter, which comprises a data acquisition circuit and a microcontroller MCU, an input end of the data acquisition circuit is connected with the lightning protection voltage limiter to be tested, a first output end of the data acquisition circuit is connected with the microcontroller MCU through an analog-to-digital conversion circuit, and a second output end of the data acquisition circuit is connected with the microcontroller MCU through an analog-to-digital conversion circuit. The second output end of the data acquisition circuit is connected with the data storage circuit through the real-time clock circuit, and the output end of the data storage circuit is connected with the microcontroller MCU. The device is simple in structure, low in manufacturing cost, and strong in anti-interference capability, can meet the test requirements of high voltage and large current in a high voltage test, and can effectively test the power frequency follow current interruption capability of a lightning protection voltage limiter of an electric power system.

Description

Technical Field

[0001] The utility model relates to the technical field of lightning protection voltage limiters, in particular to a device for testing power frequency discharge of a lightning protection voltage limiter. Background Art

[0002] Lightning arresters (SALs) are used to protect electronic equipment from damage caused by lightning or electrical surges. They are typically installed in power lines, signal lines, or grounding systems to absorb or limit surge voltages and protect connected equipment. SALs typically contain components such as metal oxide varistors (MOVs) and gas discharge tubes (GDTs). These components exhibit high impedance under normal operating voltages but rapidly reduce impedance when a surge voltage occurs, directing the surge energy to the ground, thereby protecting the equipment.

[0003] The power frequency discharge voltage of a lightning arrester (SAL) refers to the voltage at which a gradually increasing 50Hz power frequency voltage is applied to the arrester's insulation gap or dielectric until the gap or dielectric breaks down due to discharge. This voltage is known as the power frequency discharge voltage. The power frequency discharge voltage is one of the key electrical characteristic parameters of a SAL. Only SALs that meet specified power frequency discharge voltage requirements can function properly and protect equipment from atmospheric overvoltage damage. The purpose of measuring the power frequency discharge voltage of a SAL is primarily to verify its discharge characteristics. Comparing the measured value with the standard value provides information on the arc extinguishing capability of the arrester and the insulation condition of its internal components. However, current SAL test equipment for power frequency discharge of SALs is either complex and costly, or has poor anti-interference capabilities, making it inadequate for SAL testing. Utility Model Content

[0004] The utility model aims to provide a device for testing power frequency discharge of a lightning protection voltage limiter, so as to solve the technical problems of how to improve the anti-interference ability of power frequency discharge test of a lightning protection voltage limiter and reduce the cost.

[0005] The utility model is realized by adopting the following technical scheme: a device for testing the power frequency discharge of a lightning protection voltage limiter, comprising a data acquisition circuit and a microcontroller MCU, wherein the input end of the data acquisition circuit is connected to the lightning protection voltage limiter to be tested, the first output end of the data acquisition circuit is connected to the microcontroller MCU through an analog-to-digital conversion circuit, the second output end of the data acquisition circuit is connected to a data storage circuit through a real-time clock circuit, and the output end of the data storage circuit is connected to the microcontroller MCU.

[0006] Furthermore, it also includes a LORA module, the input end of the LORA module is connected to the output end of the microcontroller MCU, and the output end of the LORA module is connected to the relay gateway.

[0007] Furthermore, the microcontroller MCU is a microcontroller of the STM32 series.

[0008] Furthermore, the data acquisition circuit includes a single-phase voltage regulator T1 and a transformer T. The single-phase voltage regulator T1 and the transformer T are connected. The transformer T is connected to the lightning protection voltage limiter F to be tested via a current limiting resistor R.

[0009] Furthermore, the data acquisition circuit further includes a voltage sensor V, and the voltage sensor V is connected to the transformer T.

[0010] Furthermore, the data acquisition circuit further includes a power supply circuit U and a protection circuit. The power supply circuit is connected to the single-phase voltage regulator T1 and the transformer T respectively through the protection circuit.

[0011] Furthermore, the protection circuit includes a fuse FU, a first output end of the fuse FU is connected to the single-phase voltage regulator T1, and a second output end of the fuse FU is connected to the transformer T through the overcurrent relay K.

[0012] Furthermore, a button switch and an AC contactor KM are provided between the fuse FU and the overcurrent relay K.

[0013] The beneficial effects of the present invention are: the present invention has a simple structure, low production cost, and strong anti-interference ability, can meet the test requirements of high voltage and large current in high-voltage testing, and can effectively test the power frequency continuous current interruption capability of the lightning protection voltage limiter of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0015] Figure 1 This is the principle diagram of the utility model;

[0016] Figure 2 This is the data acquisition circuit diagram. DETAILED DESCRIPTION

[0017] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0018] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0019] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0020] See also Figure 1 A device for testing the power frequency discharge of a lightning protection voltage limiter includes a data acquisition circuit and a microcontroller MCU. The input end of the data acquisition circuit is connected to the lightning protection voltage limiter under test, the first output end of the data acquisition circuit is connected to the microcontroller MCU through an analog-to-digital conversion circuit, the second output end of the data acquisition circuit is connected to a data storage circuit through a real-time clock circuit, the output end of the data storage circuit is connected to the microcontroller MCU, and the device also includes a LORA module. The input end of the LORA module is connected to the output end of the microcontroller MCU, and the output end of the LORA module is connected to a relay gateway.

[0021] Specifically, the real-time clock circuit provides accurate time information for recording the timestamp of the test data, and specifically, the DS1302 low-power real-time clock chip can be used; the data storage circuit is used to store data and timestamps; the analog-to-digital conversion circuit is used to perform analog-to-digital conversion on the data acquired by the data acquisition circuit, and to convert the analog signal into a digital signal, and specifically, an analog-to-digital converter of model ADC0844 can be used, which has the characteristics of high precision, low power consumption, and low cost; the microcontroller MCU is used to further process the data signal converted by the analog-to-digital converter, and specifically, a microcontroller of the STM32 series can be used; the LORA module is used to send the data processed by the microcontroller MCU to the relay gateway through the LORA wireless communication technology, and can be sent to the server for storage through the relay gateway and for query by the user end, and the LORA module can specifically adopt the SX127 series communication module.

[0022] See also Figure 2The data acquisition circuit includes a single-phase voltage regulator T1 and a transformer T, wherein the single-phase voltage regulator T1 is connected to the transformer T, and the transformer T is connected to the lightning protection voltage limiter F under test through a current limiting resistor R; further includes a voltage sensor V, wherein the voltage sensor V is connected to the transformer T; further includes a power supply circuit U and a protection circuit, wherein the power supply circuit is respectively connected to the single-phase voltage regulator T1 and the transformer T through the protection circuit. Furthermore, the protection circuit includes a first fuse FU and a second fuse FU, the first output end of the first fuse FU is connected to the single-phase voltage regulator T1, and the second output end of the first fuse FU is connected to the overcurrent relay K through the AC contactor KM; the first output end of the second fuse FU is connected to the single-phase voltage regulator T1, and the second output end of the second fuse FU is connected to the overcurrent relay K through the button switch SB, the output end of the overcurrent relay K is connected to the transformer T, the power supply circuit U is closed, the voltage is evenly increased through the single-phase voltage regulator T1, and the power frequency discharge voltage value of the lightning protection voltage limiter is recorded in real time through the voltage sensor V. In order to meet the test voltage being higher than the arc extinguishing voltage of the lightning arrester for no more than 0.2s, this embodiment is provided with a single-phase voltage regulator T1, and the single-phase voltage regulator T1 is used to perform rapid voltage increase using a manual rapid voltage increase method.

[0023] Based on the above embodiments, the present invention has at least the following technical effects:

[0024] The utility model has a simple structure, low production cost, and strong anti-interference ability, can meet the test requirements of high voltage and large current in high voltage testing, and can effectively test the power frequency continuous current interruption capability of the lightning protection voltage limiter of the power system.

[0025] It should be noted that the terms "connected" and "set" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "connected" and "set" may explicitly or implicitly include one or more of the features. Moreover, the terms "connected", "set", etc. are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. And for the aforementioned embodiments, for the sake of simplicity of description, they are all expressed as a series of action combinations, but those skilled in the art should know that this application is not limited to the order of the actions described, because according to this application, some steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification belong to preferred embodiments, and the actions involved are not necessarily required by this application.

[0026] The above embodiments describe the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Without departing from the spirit and scope of the present invention, modifications and variations made by those skilled in the art without departing from the spirit and scope of the present invention should be within the scope of protection of the appended claims.

Claims

1. A device for testing power frequency discharge of a lightning protection voltage limiter, characterized in that: The invention comprises a data acquisition circuit and a microcontroller MCU, wherein the input end of the data acquisition circuit is connected to the lightning protection voltage limiter under test, the first output end of the data acquisition circuit is connected to the microcontroller MCU through an analog-to-digital conversion circuit, the second output end of the data acquisition circuit is connected to a data storage circuit through a real-time clock circuit, and the output end of the data storage circuit is connected to the microcontroller MCU.

2. The device for testing power frequency discharge of a lightning protection voltage limiter according to claim 1, characterized in that: It also includes a LORA module, the input end of the LORA module is connected to the output end of the microcontroller MCU, and the output end of the LORA module is connected to the relay gateway.

3. The device for testing power frequency discharge of a lightning protection voltage limiter according to claim 2, characterized in that: The model of the microcontroller MCU is a microcontroller of the STM32 series.

4. The device for testing power frequency discharge of a lightning protection voltage limiter according to claim 3, characterized in that: The data acquisition circuit includes a single-phase voltage regulator T1 and a transformer T. The single-phase voltage regulator T1 and the transformer T are connected. The transformer T is connected to a lightning protection voltage limiter F to be tested via a current limiting resistor R.

5. The device for testing power frequency discharge of a lightning protection voltage limiter according to claim 4, characterized in that: The data acquisition circuit further includes a voltage sensor V, which is connected to a transformer T.

6. The device for testing power frequency discharge of a lightning protection voltage limiter according to claim 5, characterized in that: The data acquisition circuit further includes a power supply circuit U and a protection circuit. The power supply circuit is connected to the single-phase voltage regulator T1 and the transformer T respectively through the protection circuit.

7. The device for testing power frequency discharge of a lightning protection voltage limiter according to claim 6, characterized in that: The protection circuit includes a fuse FU, a first output end of the fuse FU is connected to the single-phase voltage regulator T1, and a second output end of the fuse FU is connected to the transformer T through an overcurrent relay K.

8. The device for testing power frequency discharge of a lightning protection voltage limiter according to claim 7, characterized in that: A button switch and an AC contactor KM are also provided between the fuse FU and the overcurrent relay K.

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