CN-121276202-B - Capacitor voltage dividing type electricity taking device

CN121276202BCN 121276202 BCN121276202 BCN 121276202BCN-121276202-B

Abstract

The invention discloses a capacitor voltage-dividing type electricity taking device, and belongs to the technical field of electricity taking. The integrated fault risk prediction system comprises a data acquisition module, a temperature field analysis module, an impedance spectrum analysis module, an electrical state analysis module, a fault risk assessment module, a judging module and a judging module, wherein the data acquisition module acquires ambient temperature, high-voltage arm capacitor temperature, rectifying tube temperature, impedance amplitude, phase angle offset, resonant frequency offset, low-voltage arm voltage before rectification and output power, the temperature field analysis module builds a temperature field model output temperature field coefficient based on temperature data, the impedance spectrum analysis module outputs an impedance spectrum analysis coefficient based on impedance parameters, the electrical state analysis module fuses the coefficients to build a power-voltage matching model output matching coefficient, the fault risk assessment module outputs a risk coefficient through a risk quantification model, and the judging module compares each coefficient with a threshold to generate a shutdown maintenance instruction. According to the invention, through multi-parameter coupling analysis and dynamic correction model, accurate quantitative prediction of fault risk is realized, and the operation and maintenance efficiency is remarkably improved.

Inventors

GAN CAIGEN
GAN WEINIU

Assignees

宁波鹿鼎电子科技有限公司

Dates

Publication Date: 20260512
Application Date: 20251013

Claims (8)

1. The utility model provides a electric installation is got to electric capacity partial pressure formula which characterized in that includes: The fault risk prediction system is used for predicting the fault risk of the device and comprises the following steps: The temperature field analysis module is used for constructing a temperature field model output temperature field coefficient based on the ambient temperature, the high-voltage arm capacitor temperature and the rectifier tube temperature; The impedance spectrum analysis module is used for constructing an impedance spectrum analysis model output impedance spectrum analysis coefficient based on the impedance amplitude, the phase angle offset and the resonance frequency offset; The electric state analysis model is used for constructing a power-voltage matching model output power-voltage matching coefficient based on the impedance spectrum analysis coefficient, the output power under the temperature field coefficient and the low-voltage arm voltage before rectification; The fault risk assessment module is used for constructing a risk quantification model to output a risk quantification coefficient based on the temperature field coefficient, the impedance spectrum analysis coefficient and the power-voltage matching coefficient; the judging module is used for respectively comparing the temperature field coefficient, the impedance spectrum analysis coefficient, the power-voltage matching coefficient and the risk quantization coefficient with corresponding thresholds so as to obtain judging information; The risk quantization model is expressed as: Wherein, the Representing the risk quantification factor(s), Indicating the current power-voltage match, Indicating an ideal power-voltage match, Represents the standard deviation of the power-voltage matching degree, Represents the analysis coefficient of the impedance spectrum, The temperature field coefficient is represented by a temperature coefficient, Representing the response weight.
2. The capacitive voltage division type power taking device according to claim 1, further comprising a data acquisition module, wherein the data acquisition module is used for acquiring ambient temperature, high-voltage arm capacitor temperature, rectifier tube temperature, impedance amplitude, phase angle offset, resonance frequency offset, low-voltage arm voltage before rectification and output power.
3. The capacitive voltage division type power taking device according to claim 1, wherein the step of comparing the temperature field coefficient, the impedance spectrum analysis coefficient, the power-voltage matching coefficient and the risk quantization coefficient with the corresponding threshold values respectively to obtain the judgment information comprises: Comparing the temperature field coefficient with a preset temperature field coefficient threshold value, and if the temperature field coefficient is not within the temperature field coefficient threshold value, forming judging information of shutdown maintenance; Comparing the impedance spectrum analysis coefficient with a preset impedance spectrum analysis coefficient threshold value, and forming judging information of shutdown maintenance if the impedance spectrum analysis coefficient is not within the impedance spectrum analysis coefficient threshold value; Comparing the power-voltage matching coefficient with a preset power-voltage matching coefficient threshold, and forming judging information of shutdown maintenance if the power-voltage matching coefficient is not within the power-voltage matching coefficient threshold; and comparing the risk quantization coefficient with a preset risk quantization coefficient threshold, and if the risk quantization coefficient is not within the risk quantization coefficient threshold, forming judging information of shutdown maintenance.
4. The capacitive voltage division type power extraction device according to claim 1, wherein the step of constructing the output power-voltage matching coefficient of the power-voltage matching model based on the impedance spectrum analysis coefficient, the output power under the temperature field coefficient, and the low-voltage arm voltage is: constructing an efficiency correction model output efficiency correction factor according to the impedance spectrum analysis coefficient and the temperature field coefficient, wherein the efficiency correction model is expressed as: Wherein, the Representing the efficiency correction factor(s) and, The temperature field coefficient is represented by a temperature coefficient, Represents the analysis coefficient of the impedance spectrum, Represent weight coefficients and ; Constructing a theoretical power reference model to output theoretical power according to the low-voltage arm voltage before rectification and the equivalent load resistance, wherein the theoretical power reference model is expressed as: Wherein, the The power of the electric motor is represented by a theoretical power, Representing the voltage of the low-voltage arm, Representing the equivalent resistance of the resistor, Indicating the efficiency of the rectifier bridge, Representing an efficiency correction factor; Constructing a power-voltage matching model output power-voltage matching coefficient according to theoretical power and output power, wherein the power-voltage matching model is expressed as: Wherein, the Indicating the degree of power-voltage matching, Which represents the output power of the device, Representing the voltage of the low-voltage arm, Representing the equivalent resistance of the resistor, Indicating the efficiency of the rectifier bridge, Representing the efficiency correction factor.
5. The capacitive voltage division type power taking device according to claim 1 or 4, wherein the step of constructing the temperature field model output temperature field coefficient based on the ambient temperature, the high voltage arm capacitance temperature, and the rectifier tube temperature is: The current environment temperature, the current high-voltage arm capacitor temperature and the current rectifying tube temperature are led into a temperature gradient model to obtain a temperature gradient value; the current environment temperature, the current high-voltage arm capacitor temperature and the current rectifying tube temperature are led into a temperature distribution standard deviation model to obtain a temperature distribution standard deviation; Subtracting a reference temperature from the maximum value of the current environment temperature, the current high-voltage arm capacitor temperature and the current rectifying tube temperature to obtain a temperature deviation value; Respectively carrying out maximum-minimum normalization treatment on the temperature gradient value, the temperature distribution standard deviation and the temperature deviation value to obtain a current temperature gradient index, a current temperature distribution standard deviation index and a temperature deviation index; Constructing a temperature field model to output a temperature field coefficient according to the temperature gradient index, the temperature distribution standard deviation index and the temperature deviation index, wherein the temperature field model is expressed as: Wherein, the The temperature field coefficient is represented by a temperature coefficient, The index of the temperature gradient is indicated, Represents the standard deviation index of the temperature distribution, The temperature deviation index is indicated as such, Represent weight coefficients and 。
6. The capacitive voltage division type power taking device according to claim 1 or 4, wherein the step of constructing the impedance spectrum analysis model output impedance spectrum analysis coefficient based on the impedance amplitude, the phase angle offset, and the resonance frequency offset is: performing maximum-minimum normalization processing on the current impedance amplitude, the current phase angle offset and the current resonant frequency offset to obtain an impedance amplitude index, a phase angle offset index and a resonant frequency offset index; constructing an impedance spectrum analysis model output impedance spectrum analysis coefficient according to the impedance amplitude index, the phase angle offset index and the resonance frequency offset index, wherein the impedance spectrum analysis model is expressed as: Wherein, the Represents the analysis coefficient of the impedance spectrum, Representing the impedance magnitude index, Representing the phase angle shift index, Representing the index of the shift in the resonant frequency, Represent weight coefficients and 。
7. The capacitive voltage division type power extraction device according to claim 5, wherein the temperature gradient model is expressed as: Wherein, the The value of the temperature gradient is indicated, Indicating the surface temperature of the high voltage arm capacitor, Indicating the temperature of the environment and, Indicating the rectifier tube temperature.
8. The capacitive voltage division type power taking device according to claim 5, wherein the temperature distribution standard deviation model is expressed as: Wherein, the The standard deviation of the temperature distribution is indicated, The number of items is indicated and the number of items, The temperature of each point is represented, The arithmetic mean of the temperatures at each point is shown.

Description

Capacitor voltage dividing type electricity taking device Technical Field The invention belongs to the technical field of power taking devices, and particularly relates to a capacitor voltage dividing type power taking device. Background In power equipment, stability and reliability of a power taking device are critical, and the capacitive voltage division type power taking device is widely applied to high-voltage line monitoring, but faces two major challenges in long-term operation: environmental sensitivity-temperature abrupt change (environmental/element temperature difference) is likely to cause capacitance drift, resulting in partial pressure imbalance; the hidden faults are difficult to early warn, gradual shift of impedance spectrum parameters (resonant frequency/phase angle) is coupled with abnormal output power, and the fault risks are difficult to quantify by the traditional threshold method. The prior art lacks a multidimensional collaborative analysis model for temperature field distribution, impedance characteristics and electrical states, so that fault prediction is lagged, and the operation and maintenance cost is high. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a capacitor voltage division type electricity taking device, which solves the problems. In order to achieve the purpose, the invention is realized by the following technical scheme that the capacitor voltage dividing type electricity taking device comprises: The fault risk prediction system is used for predicting the fault risk of the device and comprises the following steps: The temperature field analysis module is used for constructing a temperature field model output temperature field coefficient based on the ambient temperature, the high-voltage arm capacitor temperature and the rectifier tube temperature; The impedance spectrum analysis module is used for constructing an impedance spectrum analysis model output impedance spectrum analysis coefficient based on the impedance amplitude, the phase angle offset and the resonance frequency offset; The electric state analysis model is used for constructing a power-voltage matching model output power-voltage matching coefficient based on the impedance spectrum analysis coefficient, the output power under the temperature field coefficient and the low-voltage arm voltage before rectification; The fault risk assessment module is used for constructing a risk quantification model to output a risk quantification coefficient based on the temperature field coefficient, the impedance spectrum analysis coefficient and the power-voltage matching coefficient; And the judging module is used for respectively comparing the temperature field coefficient, the impedance spectrum analysis coefficient, the power-voltage matching coefficient and the risk quantization coefficient with corresponding thresholds so as to obtain judging information. Based on the technical scheme, the invention also provides the following optional technical schemes: The system comprises a data acquisition module, a control module and a control module, wherein the data acquisition module is used for acquiring ambient temperature, high-voltage arm capacitor temperature, rectifying tube temperature, impedance amplitude, phase angle offset, resonant frequency offset, low-voltage arm voltage before rectification and output power. The further technical scheme includes the steps of comparing a temperature field coefficient, an impedance spectrum analysis coefficient, a power-voltage matching coefficient and a risk quantization coefficient with corresponding thresholds respectively to obtain judgment information, wherein the steps are as follows: Comparing the temperature field coefficient with a preset temperature field coefficient threshold value, and if the temperature field coefficient is not within the temperature field coefficient threshold value, forming judging information of shutdown maintenance; Comparing the impedance spectrum analysis coefficient with a preset impedance spectrum analysis coefficient threshold value, and forming judging information of shutdown maintenance if the impedance spectrum analysis coefficient is not within the impedance spectrum analysis coefficient threshold value; Comparing the power-voltage matching coefficient with a preset power-voltage matching coefficient threshold, and forming judging information of shutdown maintenance if the power-voltage matching coefficient is not within the power-voltage matching coefficient threshold; and comparing the risk quantization coefficient with a preset risk quantization coefficient threshold, and if the risk quantization coefficient is not within the risk quantization coefficient threshold, forming judging information of shutdown maintenance. The risk quantization model is expressed as: Wherein, the Representing the risk quantification factor(s),Indicating the current power-voltage match,Indicating an ideal power-vol