CN-224231883-U - Recognition device for overvoltage waveform of electrical equipment

Abstract

The utility model discloses an identification device of overvoltage waveforms of electrical equipment, which comprises a lightning overvoltage induction module, a sampling module and a calculation module, wherein the lightning overvoltage induction module is electrically connected with the sampling module and is used for monitoring the overvoltage flowing on an electrical circuit in real time, the sampling module is electrically connected with the calculation module and is used for collecting the overvoltage waveforms on the electrical circuit, sending the collected overvoltage waveforms to the calculation module for calculation and comparison to identify the types of the overvoltage waveforms, the calculation module is electrically connected with a threshold judgment module and is electrically connected with the sampling module, and the threshold judgment module is used for collecting the overvoltage waveforms higher than a set threshold and waking up the calculation module. The utility model can accurately judge the lightning stroke fault type aiming at the overvoltage waveform, so that different methods are adopted to carry out fault elimination and maintenance, thereby having important significance for overvoltage protection of power equipment and lightning protection of electric circuits.

Inventors

• SHANG XUESONG
• ZOU BIN

Assignees

• 南京世都科技有限公司

Dates

Publication Date

20260512

Application Date

20241227

Priority Date

20231230

Claims (9)

1. 1. The device for identifying the overvoltage waveform of the electrical equipment is characterized by comprising a lightning overvoltage sensing module, a sampling module, a threshold judging module and a calculating module, wherein the lightning overvoltage sensing module is electrically connected with the sampling module and is used for monitoring the overvoltage flowing on an electrical circuit in real time, the calculating module is electrically connected with the threshold judging module and is electrically connected with the sampling module, the sampling module is electrically connected with the calculating module, the overvoltage higher than a set threshold is selected through the threshold judging module, the collecting and processing of the overvoltage signal are carried out through the sampling module, the processed overvoltage signal is sent to the calculating module, an array and a variance of the waveform data of the overvoltage flowing on the electrical circuit are firstly collected in the calculating module, the covariance and the cross correlation coefficient of the waveform data and the typical waveform array are calculated, and the type of the overvoltage of the lightning is identified through the cross correlation coefficient.
2. 2. The device for recognizing overvoltage waveforms of electrical equipment according to claim 1, wherein the sampling module is further electrically connected to the calculating module, and the filtering module is used for filtering interference in the collected and processed overvoltage signals.
3. 3. The device for recognizing overvoltage waveforms of electrical equipment according to claim 2, wherein the calculation module is further electrically connected to the data storage module for storing the collected overvoltage signals and the calculation data of the calculation module.
4. 4. The device for recognizing overvoltage waveforms of electrical equipment according to claim 1, wherein the sampling module comprises an operational amplifier chip, an input end and an output end of the operational amplifier chip are connected with a feedback resistor in a crossing manner, and the input end of the operational amplifier chip is further connected with a TVS tube and a diode.
5. 5. The device for recognizing overvoltage waveforms of electrical equipment according to claim 4, wherein the threshold judging module comprises two identical comparison circuits, the comparison circuits further comprise an input positive voltage dividing resistor, an input negative voltage dividing resistor and a comparator, and a signal wire led out from one end of the input positive voltage dividing resistor is connected to the input end of the operational amplifier circuit chip.
6. 6. The device for recognizing overvoltage waveforms of electrical equipment according to claim 3, wherein the computing module comprises an MCU control chip, and the MCU control chip is STM32L151RCT 6.
7. 7. The device for recognizing overvoltage waveforms of electrical equipment according to claim 3, wherein the data storage module comprises a FLASH memory chip, and the FLASH memory chip is of a W25Q64 type.
8. 8. The device for recognizing overvoltage waveforms of electrical equipment according to claim 4, wherein the operational amplifier circuit chip is of an AD8541ARZ type.
9. 9. The device for recognizing overvoltage waveforms of electrical equipment according to claim 5, wherein the comparator is an LMV7271 type.

Description

Recognition device for overvoltage waveform of electrical equipment Technical Field The utility model relates to the technical field of overvoltage identification, in particular to an identification device for overvoltage waveforms of electrical equipment. Background The important function of the electrical equipment in our life and production is not neglected, and the electrical equipment brings great convenience to us, and becomes an important energy source in our production and life. With the current wide distribution of power lines, but the insulation protection level is lower, electric equipment on the power lines is extremely easy to be struck by lightning, so that flashover faults of the power lines are caused and power supply interruption accidents are caused. Types of lightning overvoltage include direct lightning overvoltage, induced lightning overvoltage, lightning counterattack overvoltage and the like. When lightning directly strikes the power line, strong lightning current can generate direct lightning overvoltage, or inductive lightning overvoltage generated by induction of nearby conductors when the lightning strikes an object, and both the lightning overvoltage and the lightning overvoltage can cause lightning overvoltage faults on the power line. Since the direct lightning overvoltage and the induced lightning overvoltage are different in invasion manner, the mechanism of fault formation is different. If the type of lightning overvoltage cannot be determined, the method is easy to cause lack of objective basis for the application of lightning strike countermeasures, so that the lightning protection effect is difficult to improve. However, most of the current devices for distinguishing the type of lightning overvoltage are based on the distinguishing method for analyzing the current signal or the spectrum analysis of the overvoltage signal, however, the distinguishing cannot be accurately distinguished, and whether the type of lightning overvoltage is the type of lightning overvoltage or the operation type of overvoltage is not. Accordingly, there is a need for an apparatus that can identify overvoltage waveforms of electrical devices. Disclosure of utility model The summary of the utility model is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. The summary of the utility model is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter. Aiming at the problems and defects existing in the prior art, the utility model provides the recognition device for the overvoltage waveforms of the electrical equipment, which can realize the category of the overvoltage waveforms flowing through an electrical circuit by a lightning overvoltage induction module, a sampling module, a threshold judgment module, a filtering module and a calculation module, so that workers can quickly take corresponding modes to process, and the lightning overvoltage faults on the power line are reduced. To solve the problems set forth in the background art. The lightning overvoltage sensing module is electrically connected with the sampling module and used for monitoring overvoltage flowing on an electric circuit in real time, the calculating module is electrically connected with the threshold judging module and electrically connected with the sampling module, the sampling module is electrically connected with the calculating module, overvoltage higher than a set threshold value is selected through the threshold judging module, overvoltage signals are collected and processed through the collecting module, the processed overvoltage signals are sent to the calculating module, and the type of the overvoltage is obtained through calculation, comparison and identification in the calculating module. Preferably, the sampling module is further electrically connected with the calculating module, and is used for filtering interference in the collected and processed overvoltage signals. Preferably, the calculation module is further electrically connected with the data storage module, and is used for storing the collected overvoltage signals and the calculation data of the calculation module. Preferably, the sampling module comprises an operational amplifier circuit chip, wherein the input end and the output end of the operational amplifier circuit chip are connected with the feedback resistor in a crossing way, and the input end of the operational amplifier circuit chip is also connected with a TVS tube and a diode. Preferably, the threshold judging module comprises two groups of identical comparison circuits, the comparison circuits further comprise an input positive voltage dividing resistor, an input negative voltage dividing resistor and a comparator, and a signal wire led out from one end of the input positive voltage dividing resistor is con