CN-115524536-B - Method, device and system for testing direct-current resistance and evaluating state of dry-type reactor

CN115524536BCN 115524536 BCN115524536 BCN 115524536BCN-115524536-B

Abstract

The application relates to a method, a device and a system for testing direct current resistance and evaluating state of a dry-type reactor. The method comprises the steps of obtaining the ambient temperature of a dry reactor, obtaining the collected temperature of the dry reactor, processing the temperature of the dry reactor to obtain the average temperature of the dry reactor, adjusting the temperature of the dry reactor according to the ambient temperature and the average temperature of the dry reactor so that the temperature of the dry reactor and the ambient temperature reach a heat exchange stable state, obtaining a direct current resistance value of the dry reactor when the temperature of the dry reactor and the ambient temperature reach the heat exchange stable state, converting the direct current resistance value into an actual direct current resistance value of the dry reactor at a factory temperature, comparing the actual direct current resistance value with the factory direct current resistance value of the dry reactor, and carrying out state evaluation on the dry reactor according to a comparison result. The method can solve the problem that the direct current resistance test of the dry reactor is limited by the meteorological conditions.

Inventors

JIN HUI
XIA HUI
PAN KAI
LI HONGYUAN
XIAO HUANGNENG
SHAO CHENGLIN
YANG CHENG
ZHOU YU
YANG FANGMING
WU QIANJIN
YANG DONG
LONG FANGYU
XU YI
WANG XIN
SUN KUN
WU DEGUAN

Assignees

中国南方电网有限责任公司超高压输电公司检修试验中心

Dates

Publication Date: 20260505
Application Date: 20220915

Claims (9)

1. The method is characterized by being applied to a direct current resistance testing device of the dry reactor, wherein the direct current resistance testing device of the dry reactor is connected with a wiring board of the dry reactor in a wired connection mode, and the method comprises the following steps: the method comprises the steps of acquiring the ambient temperature of a dry reactor, wherein the ambient temperature is acquired by an ambient temperature measuring unit arranged on a direct current resistance testing device of the dry reactor; Acquiring the acquired dry reactor temperature, and processing the dry reactor temperature to obtain the average temperature of the dry reactor; If the ambient temperature is greater than the average temperature of the dry reactor and the difference between the ambient temperature and the average temperature of the dry reactor is within a set adjustable range, outputting a current with a set amplitude to the dry reactor when the temperature of the dry reactor and the ambient temperature do not reach a heat exchange stable state, lifting the temperature of the dry reactor, returning to the acquired dry reactor temperature, and processing the dry reactor temperature to obtain the average temperature of the dry reactor; if the ambient temperature is greater than the average temperature of the dry reactor and the difference between the ambient temperature and the average temperature of the dry reactor is outside a set adjustable range, the dry reactor temperature and the ambient temperature do not exchange heat, returning to the acquired dry reactor temperature, and processing the dry reactor temperature to obtain the average temperature of the dry reactor; If the ambient temperature is smaller than the average temperature of the dry reactor, the temperature of the dry reactor and the ambient temperature reach a heat exchange stable state; acquiring a direct current resistance value of the dry reactor when the temperature of the dry reactor and the ambient temperature reach a heat exchange stable state; Converting the direct current resistance value into an actual direct current resistance value of the dry-type reactor at the factory temperature, comparing the actual direct current resistance value with the factory direct current resistance value of the dry-type reactor, and carrying out state evaluation on the dry-type reactor according to a comparison result.
2. The method of claim 1, wherein the acquiring the collected dry reactor temperature and processing the dry reactor temperature to obtain a dry reactor average temperature comprises: Acquiring temperature data of the inner wall of the dry reactor, which is acquired by an inner wall sensor of the dry reactor; acquiring temperature data of the outer wall of the dry reactor, which is acquired by an outer wall sensor of the dry reactor; Abnormal data checking is carried out on the temperature data of the inner wall of the dry reactor and the temperature data of the outer wall of the dry reactor; And selecting a maximum value and a minimum value from the inner wall temperature data of the dry reactor and the outer wall temperature data of the dry reactor after abnormal data investigation to obtain an average temperature of the dry reactor.
3. The method of claim 2, wherein the anomaly data investigation of the dry reactor inner wall temperature data and the dry reactor outer wall temperature data comprises: And according to the detected temperature deviation range corresponding to the ambient temperature, abnormal data checking is carried out on the inner wall temperature data of the dry reactor and the outer wall temperature data of the dry reactor.
4. The method according to claim 1, wherein the performing the state evaluation on the dry reactor according to the comparison result includes: when the deviation value of the actual direct current resistance value and the factory direct current resistance value is smaller than or equal to a set deviation value, judging that the dry-type reactor is normal; and when the deviation value of the actual direct current resistance value and the factory direct current resistance value is larger than a set deviation value, judging that the dry-type reactor is abnormal, and outputting inspection prompt information.
5. The method according to claim 1, wherein the number of the dry reactors is two or more, the converting the dc resistance value into an actual dc resistance value of the dry reactors at a factory temperature, comparing the actual dc resistance value with a factory dc resistance value of the dry reactors, and after evaluating the state of the dry reactors according to the comparison result, further comprising: Calculating the average value of the actual direct current resistance values obtained by the current measurement of each dry-type reactor to obtain the average value of the actual direct current resistance; calculating a numerical average value of the factory direct current resistance values of each dry-type reactor to obtain a factory direct current resistance average value; according to the actual direct current resistance average value and the factory direct current resistance average value, respectively obtaining an actual direct current resistance variance and a factory direct current resistance variance; dividing the actual direct current resistance variance by the factory direct current resistance variance to obtain a variance ratio; and comparing the variance ratio with a variance ratio threshold corresponding to the set confidence coefficient, and obtaining the whole test working error analysis of the current measurement of each dry reactor according to the comparison result.
6. The method according to claim 1, wherein the converting the dc resistance value into an actual dc resistance value of the dry reactor at a factory temperature, comparing the actual dc resistance value with the factory dc resistance value of the dry reactor, and after performing the state evaluation on the dry reactor according to the comparison result, further comprises: sequentially calculating the difference between the actual direct current resistance value obtained by the current measurement of the dry-type reactor and all the previous actual direct current resistance values, and calculating the standard deviation of the difference to obtain a detection value; and comparing the detection value with a detection threshold value corresponding to the set significance level, and carrying out evaluation analysis on the running state of the dry-type reactor according to a comparison result.
7. A dry reactor dc resistance testing and condition assessment apparatus, the apparatus comprising: The system comprises an environment temperature measuring module, a temperature measuring module and a temperature measuring module, wherein the environment temperature measuring module is used for acquiring the environment temperature of the dry-type reactor; the dry reactor temperature measurement module is used for acquiring the acquired dry reactor temperature and processing the dry reactor temperature to obtain the average temperature of the dry reactor; A temperature adjustment module, configured to output a current with a set amplitude to the dry reactor if the ambient temperature is greater than the average temperature of the dry reactor and the difference between the ambient temperature and the average temperature of the dry reactor is within a set adjustable range, and the current does not reach a stable heat exchange state between the dry reactor temperature and the ambient temperature, to raise the temperature of the dry reactor, and to return the acquired dry reactor temperature, and to process the dry reactor temperature to obtain the average temperature of the dry reactor; if the ambient temperature is greater than the average temperature of the dry reactor and the difference between the ambient temperature and the average temperature of the dry reactor is outside a set adjustable range, the dry reactor temperature and the ambient temperature do not exchange heat, the acquired dry reactor temperature is returned, and the dry reactor temperature is processed to obtain the average temperature of the dry reactor; The test module is used for obtaining the direct current resistance value of the dry reactor when the temperature of the dry reactor and the ambient temperature reach a heat exchange stable state; The analysis module is used for converting the direct current resistance value into an actual direct current resistance value of the dry-type reactor at the factory temperature, comparing the actual direct current resistance value with the factory direct current resistance value of the dry-type reactor, and carrying out state evaluation on the dry-type reactor according to a comparison result.
8. The system is characterized by comprising a dry reactor direct current resistance testing device and a temperature sensor, wherein the dry reactor direct current resistance testing device and the temperature sensor are in wireless connection, and an environment temperature measuring unit is arranged on the dry impedance direct current resistance testing device; the environment temperature measuring unit is used for collecting the environment temperature of the environment where the dry-type reactor is located; the dry reactor direct current resistance testing device is used for carrying out direct current resistance testing and state evaluation on the dry reactor according to the method of any one of claims 1-6.
9. The system of claim 8, wherein the dry reactor dc resistance testing device comprises a housing, a test port, a wireless communication unit, an interactive device, and a control board, the control board disposed within the housing, the test port, the ambient temperature measurement unit, and the interactive device all disposed on the housing and connected to the control board, the wireless communication unit in communication with the temperature sensor and connected to the control board.

Description

Method, device and system for testing direct-current resistance and evaluating state of dry-type reactor Technical Field The application relates to the technical field of reactor testing, in particular to a method, a device and a system for testing direct current resistance and evaluating state of a dry reactor. Background With the continuous development of power systems in China, the AC/DC dry reactor has been widely applied to ultra-high voltage and ultra-high voltage power systems due to the simple structure and low operation and maintenance cost. The dry reactor is not only impacted by various system harmonic waves for a long time to continuously accumulate the action of electric force to cause winding disconnection, turn-to-turn short circuit and the like, but also affected by external environmental factors such as earthquake, ultraviolet irradiation, large day-to-night temperature difference and the like to cause encapsulation aging cracking to cause interlayer or turn-to-turn dielectric breakdown and the like during operation. Therefore, the direct current resistance of the dry reactor needs to be tested, and hidden danger of the dry reactor is timely checked. In the conventional technology, when testing the direct current resistance of the dry reactor, the measurement method for the temperature of the dry reactor mostly begins to measure by measuring the ambient temperature, assuming that the ambient temperature is the temperature of the dry reactor. However, in order to obtain more accurate data, the dry-type reactor needs to be in an environment with stable meteorological conditions such as no sunlight irradiation, no wind, no rain and snow, and the like, so that certain accuracy can be ensured. However, the time for stabilizing meteorological conditions is limited every day, and the detection window period of the dry reactor is short, so that the direct current resistance test of the dry reactor is seriously influenced due to the limitation of the meteorological conditions. Disclosure of Invention In view of the foregoing, it is desirable to provide a method, apparatus and system for testing and evaluating the dc resistance of a dry reactor that can solve the problem that the dc resistance test of the dry reactor is limited by meteorological conditions. In a first aspect, the present application provides a method for testing direct current resistance and evaluating state of a dry reactor, the method comprising: acquiring the ambient temperature of the dry reactor; Acquiring the acquired dry reactor temperature, and processing the dry reactor temperature to obtain the average temperature of the dry reactor; According to the ambient temperature and the average temperature of the dry reactor, the dry reactor is subjected to temperature regulation so that the temperature of the dry reactor and the ambient temperature reach a heat exchange stable state; acquiring a direct current resistance value of the dry reactor when the temperature of the dry reactor and the ambient temperature reach a heat exchange stable state; Converting the direct current resistance value into an actual direct current resistance value of the dry-type reactor at the factory temperature, comparing the actual direct current resistance value with the factory direct current resistance value of the dry-type reactor, and carrying out state evaluation on the dry-type reactor according to a comparison result. In one embodiment, the acquiring the acquired dry reactor temperature, and processing the dry reactor temperature to obtain an average dry reactor temperature includes: Acquiring temperature data of the inner wall of the dry reactor, which is acquired by an inner wall sensor of the dry reactor; acquiring temperature data of the outer wall of the dry reactor, which is acquired by an outer wall sensor of the dry reactor; Abnormal data checking is carried out on the temperature data of the inner wall of the dry reactor and the temperature data of the outer wall of the dry reactor; And selecting a maximum value and a minimum value from the inner wall temperature data of the dry reactor and the outer wall temperature data of the dry reactor after abnormal data investigation to obtain an average temperature of the dry reactor. In one embodiment, the performing abnormal data checking on the dry reactor inner wall temperature data and the dry reactor outer wall temperature data includes: And according to the detected temperature deviation range corresponding to the ambient temperature, abnormal data checking is carried out on the inner wall temperature data of the dry reactor and the outer wall temperature data of the dry reactor. In one embodiment, the adjusting the temperature of the dry reactor according to the ambient temperature and the average temperature of the dry reactor to make the temperature of the dry reactor reach a heat exchange stable state with the ambient temperature includes: if the ambient temperature is smaller than t