CN-121994975-A - Quantitative experiment method and system for insulating oil cracking gas production characteristics of transformer at constant temperature

CN121994975ACN 121994975 ACN121994975 ACN 121994975ACN-121994975-A

Abstract

The invention relates to the technical field of transformer insulating oil cracking, and provides a quantitative experiment method and a quantitative experiment system for the cracking gas production characteristics of transformer insulating oil at constant temperature, which are used for solving the problems that the prior art cannot accurately measure the gas quantity, the component distribution and the gas production rate generated by cracking quantitative insulating oil at different temperatures. The constant temperature transformer insulating oil cracking gas production characteristic quantitative experiment system comprises a tube furnace, a gas chromatograph and a processor, wherein the tube furnace is used for conducting constant temperature cracking experiments on insulating oil to collect cracking gas and record a pressure-time curve, the processor is used for calculating total gas quantity and total gas production rate in the tube furnace according to an ideal gas equation and combining the condition of pressure change along with time, and the gas production rate of each gas component are obtained according to the ratio of each component, so that the gas quantity, component distribution and gas production rate generated by cracking the quantitative insulating oil at different temperatures can be accurately measured.

Inventors

MAO GUANGHUI
YU WEINAN
DIAO FENGXIN
WEN TAO
FAN XING
PEI ZHEHAO
ZHOU YAN
SHI HAIPENG
ZHAO YI
WANG KUNHAN
AN YIYAN
WANG YANWEI
ZHANG PING
ZHANG XINGYU

Assignees

国网内蒙古东部电力有限公司电力科学研究院
合肥工业大学

Dates

Publication Date: 20260508
Application Date: 20260409

Claims (10)

1. A constant temperature transformer insulating oil pyrolysis gas production characteristic quantitative experiment system is characterized by comprising a tubular furnace, a gas chromatograph and a processor, wherein the tubular furnace comprises a furnace tube, a material boat, a heat insulation block, a pushing rod and a vacuum pump, heating bodies are uniformly arranged on the periphery of the middle part of the furnace tube to form a heating constant temperature area, sealing flanges are arranged at two ends of the furnace tube, a pressure sensor and a gas outlet are arranged on one sealing flange, a gas inlet is arranged on the other sealing flange, quantitative insulating oil is contained in the material boat and is arranged at the left side of the interior of the furnace tube, the heat insulation block is arranged in the interior of the furnace tube and is positioned at the right side of the material boat, the right side area of the heat insulation block is the heating constant temperature area, the pushing rod is movably connected with the furnace tube to push the material boat and the heat insulation block into the heating constant temperature area, and the vacuum pump is communicated with the furnace tube; The gas chromatograph is connected to the gas outlet and used for analyzing the components and the proportion of the cracking gas in the furnace tube, the gas chromatograph and the pressure sensor are connected with the processor, the processor is used for forming a pressure-time curve according to the pressure of the cracking gas in the furnace tube detected by the pressure sensor, calculating the total gas quantity and the total gas production rate-time curve in the furnace tube by using an ideal gas equation, and obtaining the gas production rate and the gas production rate of each gas component according to the component proportion of the cracking gas.
2. The quantitative experiment system for the pyrolysis gas production characteristics of insulating oil of a transformer under constant temperature according to claim 1, wherein the outer parts of two sides of the furnace tube are respectively provided with a water cooling tube so as to ensure that the temperature of two ends is lower than the phase transition temperature of the insulating oil.
3. The quantitative experiment system for the characteristics of insulating oil cracking gas production of the transformer under constant temperature according to claim 1, wherein the tube furnace further comprises a shell, and the tube furnace is detachably connected in the shell.
4. A quantitative experimental method for the pyrolysis gas production characteristics of insulating oil of a transformer at a constant temperature, which is characterized by comprising the following steps of: Installing a tube furnace, vacuumizing by a vacuum pump, injecting inert gas to standard atmospheric pressure, setting a target temperature, continuously introducing the inert gas during the heating period, closing a gas passage when the temperature of a constant temperature area of the tube furnace reaches the target temperature, pushing a material boat and a heat insulation block into the heating constant temperature area by using a pushing rod for cracking reaction, collecting cracking gas after the pressure in the furnace tube is stable, and recording a pressure-time curve; Analyzing the collected cracking gas by using a gas chromatograph to obtain components and the ratio of the components of the cracking gas; And calculating the total gas quantity and the total gas production rate in the tubular furnace by utilizing the processor according to an ideal gas equation and combining a pressure-time curve, and multiplying the calculated total gas quantity and the calculated total gas production rate by the duty ratio of each component to obtain the gas production quantity and the gas production rate of each gas component.
5. The quantitative experimental method for the pyrolysis gas production characteristics of transformer insulating oil under constant temperature according to claim 4, wherein a pressure-time curve in a furnace tube is recorded as P (T), the quantity of initial gas substances in the furnace tube is recorded as n 0 , according to an ideal gas state equation P (T) V 0 =n(t)RT 0 , the temperature T 0 is a set value, the volume V 0 is the volume of the furnace tube, R is an ideal gas constant, the pressure P (T) is substituted into the equation, the quantity n (T) =P (T) V/RT of the gas substances in the furnace tube is solved, the generated gas quantity n 1 (t)=n(t)-n 0 is obtained, and finally the generated gas volume V (T) is obtained, wherein T is time.
6. The quantitative experimental method for the characteristics of the insulating oil cracking gas production of the transformer under the constant temperature according to claim 5, wherein after the generated gas quantity n 1 (t) and the gas volume V (t) are obtained, the corresponding gas production rate V (t) =dv (t)/dt is obtained by deriving time.
7. The quantitative experiment method for the pyrolysis gas production characteristics of the insulating oil of the transformer under the constant temperature according to claim 4, wherein the analysis of the collected pyrolysis gas by using a gas chromatograph comprises the following steps: And (3) carrying out chromatographic analysis on the collected cracking gas, repeating detection for at least three times on each group of samples, averaging the final results, and obtaining different gas component content ratios through chromatographic analysis.
8. The quantitative experimental method for the pyrolysis gas production characteristics of insulating oil of a transformer under constant temperature according to claim 4, wherein the target temperature is lower than the limit temperature of a tube furnace.
9. The quantitative experiment method for the characteristics of the insulating oil cracking gas production of the transformer under the constant temperature according to claim 4, wherein the gas inlet and the gas outlet are closed when the temperature of the heating constant temperature area of the tubular furnace reaches a target temperature value.
10. The quantitative experimental method for the pyrolysis gas production characteristics of insulating oil of a transformer under constant temperature according to claim 4, wherein the insulating oil is injected into the material boat when the experiment is started, the insulating block is placed into the left side of the furnace tube from the left side of the furnace tube, and then the material boat is placed on the left side of the insulating block, so that the material boat is ensured to be in a low-temperature region of the furnace tube.

Description

Quantitative experiment method and system for insulating oil cracking gas production characteristics of transformer at constant temperature Technical Field The invention relates to the technical field of transformer insulating oil cracking, in particular to a quantitative experiment method and system for the insulating oil cracking gas production characteristics of a transformer at constant temperature. Background The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. In the prior art, the research on the constant-temperature cracking and gas production process of insulating oil generally adopts a resistance wire to heat the insulating oil and analyze the cracking gas, but the temperature distribution in the oil is uneven due to the heating of the resistance wire, the temperature of a region close to the resistance wire is obviously higher, but the temperature is difficult to precisely control by a resistance wire heating method, and the temperature is often simply controlled by adopting a voltage regulator to control the voltage. In addition, in the pyrolysis experiment of insulating oil, a long time is required to raise to a high temperature, and when the insulating oil is not raised to a specified temperature, pyrolysis also occurs, resulting in deviation of experimental results. In summary, the method for heating insulating oil and analyzing cracked gas by the resistance wire has low temperature adjustment precision, uneven temperature distribution and low temperature rising speed, and can not accurately measure the gas quantity, component distribution and gas production rate generated by cracking quantitative insulating oil at different temperatures. Disclosure of Invention In order to solve the technical problems, the invention provides a quantitative experiment method and a quantitative experiment system for the cracking gas production characteristics of transformer insulating oil under constant temperature, which are used for realizing accurate measurement of the cracking gas production characteristics of the insulating oil under different temperatures by reversely pushing the gas quantity change in a furnace tube through an ideal gas state equation and analyzing the gas production components under different temperatures through a gas chromatograph and accurately measuring the gas quantity, the component distribution and the gas production rate of the quantitative insulating oil under different temperatures. In order to achieve the above purpose, the present invention adopts the following technical scheme: The invention provides a quantitative experiment system for the cracking gas production characteristics of insulating oil of a transformer at constant temperature. In one or more embodiments, the quantitative experiment system for the pyrolysis gas production characteristics of the insulating oil of the transformer under constant temperature comprises a tube furnace, a gas chromatograph and a processor, wherein the tube furnace comprises a furnace tube, a material boat, an insulating block, a pushing rod and a vacuum pump, heating bodies are uniformly arranged on the periphery of the middle part of the furnace tube to form a heating constant temperature area, sealing flanges are arranged at two ends of the furnace tube, a pressure sensor and a gas outlet are arranged on one end of the sealing flanges, a gas inlet is arranged on the other end of the sealing flanges, quantitative insulating oil is contained in the material boat and is arranged on the left side of the interior of the furnace tube, the insulating block is arranged in the interior of the furnace tube and is positioned on the right side of the material boat, the right side area of the insulating block is the heating constant temperature area, the pushing rod is movably connected with the furnace tube to push the material boat and the insulating block into the heating constant temperature area, and the vacuum pump is communicated with the furnace tube; The gas chromatograph is connected to the gas outlet and used for analyzing the components and the proportion of the cracking gas in the furnace tube, the gas chromatograph and the pressure sensor are connected with the processor, the processor is used for forming a pressure-time curve according to the pressure of the cracking gas in the furnace tube detected by the pressure sensor, calculating the total gas quantity and the total gas production rate-time curve in the furnace tube by using an ideal gas equation, and obtaining the gas production rate and the gas production rate of each gas component according to the component proportion of the cracking gas. As an implementation mode, the outside of two sides of the furnace tube is provided with a water cooling tube so as to ensure that the temperature of two ends is lower than the phase transition temperature of the insulating oil. As one embodimen