CN111965503A - Insulation detection method for high-voltage GIS equipment - Google Patents
Insulation detection method for high-voltage GIS equipment Download PDFInfo
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- CN111965503A CN111965503A CN202010804681.2A CN202010804681A CN111965503A CN 111965503 A CN111965503 A CN 111965503A CN 202010804681 A CN202010804681 A CN 202010804681A CN 111965503 A CN111965503 A CN 111965503A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1254—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of gas-insulated power appliances or vacuum gaps
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- Testing Relating To Insulation (AREA)
- Gas-Insulated Switchgears (AREA)
Abstract
The invention provides a high-voltage GIS equipment insulation detection method, which comprises the following steps: (1): collecting signals; (2) and (3): judging whether the SF6 gas density and the internal pressure are greater than the alarm value, if so, giving an alarm; (4) (5), (6): extracting the amplitude of the ultrasonic signal, and calculating the difference value with the background signal and the ratio of the difference value to the amplitude; (7): judging whether the ratio is greater than a reference value; (8) (9), (10): converting the ultrasonic signals, extracting the content of 50HZ and 100HZ signals, and calculating the ratio of the content to the amplitude; (11) and (12): judging whether the ratio of the 50HZ signal content to the 100HZ signal content to the amplitude is larger than a reference value or not; (13): calculating the interval of the two ultrasonic signals; (14): judging whether the interval is less than 50ms and the amplitude is less than 40mV, if so, damaging the particles; otherwise, no harm is caused; to (16); (15): judging whether the interval is more than 50ms and less than 100ms and the amplitude is less than 20mV, if so, damaging the particles; if not, no harm is caused temporarily; to (16); (16): and judging whether to continue.
Description
Technical Field
The invention belongs to the technical field of electric power detection, and particularly relates to an insulation detection method for high-voltage GIS equipment.
Background
High-voltage GIS equipment is widely applied due to the advantages of good electrical performance, safe and reliable operation, small occupied space, long overhaul period and the like. Along with the continuous improvement of the requirements of people on power supply and distribution, the safety and the reliability of high-voltage GIS equipment need to be ensured, so that the high-voltage GIS equipment needs to be subjected to
The invention provides an insulation detection method for high-voltage GIS equipment, which can judge and analyze the internal condition of the high-voltage GIS equipment according to abnormal ultrasonic signals, find abnormal conditions in time and analyze and judge specific defect types so as to carry out equipment maintenance more specifically and ensure the safety and reliability of power transmission and distribution.
Disclosure of Invention
The invention provides an insulation detection method for high-voltage GIS equipment, which can find the internal abnormality of the high-voltage GIS equipment in time and ensure the safe and reliable work of the high-voltage GIS equipment.
The invention particularly relates to an insulation detection method for high-voltage GIS equipment, which comprises the following steps:
step (1): collecting the gas density, the internal pressure and the internal ultrasonic signal of the high-voltage GIS SF 6;
step (2): judging whether the density of the SF6 gas is larger than a density alarm value, if so, sending an alarm of low density of the SF6 gas, and entering the step (3); if not, entering the step (3);
and (3): judging whether the internal pressure is greater than a pressure alarm value, if so, sending an internal pressure low alarm, and entering the step (4); if not, entering the step (4);
and (4): extracting the ultrasonic signal amplitude;
and (5): calculating the difference value between the ultrasonic signal amplitude and a background signal;
and (6): calculating the ratio of the difference value to the ultrasonic signal amplitude value;
and (7): judging whether the ratio of the difference value to the ultrasonic signal amplitude is larger than a first ratio reference value or not, if so, entering the step (8), otherwise, returning to the step (1);
and (8): performing a fast Fourier transform on the ultrasound signal;
and (9): extracting 50HZ signal content and 100HZ signal content;
step (10): calculating the ratio of the 50HZ signal content to the ultrasonic signal amplitude, and calculating the ratio of the 100HZ signal content to the ultrasonic signal amplitude;
step (11): judging whether the ratio of the 50HZ signal content to the ultrasonic signal amplitude is larger than a second ratio reference value or not, if so, entering a step (13), and if not, entering a step (12);
step (12): judging whether the ratio of the 100HZ signal content to the ultrasonic signal amplitude is greater than a third ratio reference value or not, if so, entering a step (13), otherwise, entering a step (16) if the high-voltage GIS equipment has a discharge fault;
step (13): calculating the interval of the two ultrasonic signals;
step (14): judging whether the interval is less than 50ms and the amplitude of the ultrasonic signal is less than 40mV, if so, damaging particles in the high-voltage GIS equipment, and entering the step (16); if not, the particles in the high-voltage GIS equipment are not harmful temporarily, and the step (16) is carried out;
step (15): judging whether the interval is more than 50ms and less than 100ms and the amplitude of the ultrasonic signal is less than 20mV, if so, damaging particles in the high-voltage GIS equipment, entering a step (16), and if not, temporarily preventing the particles in the high-voltage GIS equipment from being damaged, entering the step (16);
step (16): and (4) judging whether to continue detection, if so, returning to the step (1), and if not, ending.
The internal ultrasonic signals are collected by an ultrasonic sensor, and the ultrasonic sensor is installed on the GIS equipment metal shell through a coupling agent.
The first ratio reference value, the second ratio reference value and the third ratio reference value are 10%.
Compared with the prior art, the beneficial effects are: the insulation detection method comprises the steps of firstly judging whether an insulation medium in the high-voltage GIS equipment is abnormal or not, further judging and analyzing the internal condition of the high-voltage GIS equipment according to an abnormal ultrasonic signal, finding out the abnormal condition in time, and analyzing and judging the specific defect type, so that equipment maintenance can be carried out more specifically, and the safety and reliability of power transmission and distribution are ensured.
Detailed Description
The following describes in detail a specific embodiment of the insulation detection method for high-voltage GIS equipment according to the present invention.
The insulation detection method of the invention firstly carries out preliminary judgment on the high-voltage GIS equipment through SF6 gas density and internal pressure:
judging whether the density of the SF6 gas is greater than a density alarm value, if so, sending an alarm of low density of the SF6 gas;
and judging whether the internal pressure is greater than the pressure alarm value, and if so, giving an alarm of low internal pressure.
Further, extracting the amplitude of the ultrasonic signal, and judging whether the high-voltage GIS equipment has a discharge fault:
calculating the difference value between the ultrasonic signal amplitude and the background signal; calculating the ratio of the difference value to the amplitude value of the ultrasonic signal; judging whether the ratio of the difference value to the ultrasonic signal amplitude value is larger than a first ratio reference value or not, and if so, performing fast Fourier transform on the ultrasonic signal; extracting 50HZ signal content and 100HZ signal content; calculating the ratio of the 50HZ signal content to the ultrasonic signal amplitude, and calculating the ratio of the 100HZ signal content to the ultrasonic signal amplitude; and judging whether the ratio of the 50HZ signal content to the ultrasonic signal amplitude is greater than a second ratio reference value or not, if not, judging whether the ratio of the 100HZ signal content to the ultrasonic signal amplitude is greater than a third ratio reference value or not, and if not, discharging faults of the high-voltage GIS equipment occur.
Wherein the first ratio reference value, the second ratio reference value and the third ratio reference value are 10%.
Further, the particle inside the high-voltage GIS equipment is judged to be harmful:
calculating the interval of the two ultrasonic signals;
judging whether the interval is less than 50ms and the amplitude of the ultrasonic signal is less than 40mV, if so, damaging particles in the high-voltage GIS equipment; if not, the particles in the high-voltage GIS equipment are not harmful temporarily);
and judging whether the interval is more than 50ms and less than 100ms and the amplitude of the ultrasonic signal is less than 20mV, if so, damaging the particles in the high-voltage GIS equipment, and if not, temporarily not damaging the particles in the high-voltage GIS equipment.
The internal ultrasonic signals are collected by an ultrasonic sensor and are installed on a GIS equipment metal shell through a coupling agent.
The internal ultrasonic signal is mainly generated by partial discharge or particle defects, has the characteristics of high frequency, small amplitude and the like, has short duration and larger randomness of occurrence time if the internal ultrasonic signal is generated by the particle defects, and can continuously acquire information by the insulation detection method so as to further analyze and judge; and distinguishing whether the discharge fault is the particle damage according to the ratio of the 50HZ signal content, the 100HZ signal content and the ultrasonic signal amplitude.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (3)
1. The insulation detection method for the high-voltage GIS equipment is characterized by comprising the following steps:
step (1): collecting the gas density, the internal pressure and the internal ultrasonic signal of the high-voltage GIS SF 6;
step (2): judging whether the density of the SF6 gas is larger than a density alarm value, if so, sending an alarm of low density of the SF6 gas, and entering the step (3); if not, entering the step (3);
and (3): judging whether the internal pressure is greater than a pressure alarm value, if so, sending an internal pressure low alarm, and entering the step (4); if not, entering the step (4);
and (4): extracting the ultrasonic signal amplitude;
and (5): calculating the difference value between the ultrasonic signal amplitude and a background signal;
and (6): calculating the ratio of the difference value to the ultrasonic signal amplitude value;
and (7): judging whether the ratio of the difference value to the ultrasonic signal amplitude is larger than a first ratio reference value or not, if so, entering the step (8), otherwise, returning to the step (1);
and (8): performing a fast Fourier transform on the ultrasound signal;
and (9): extracting 50HZ signal content and 100HZ signal content;
step (10): calculating the ratio of the 50HZ signal content to the ultrasonic signal amplitude, and calculating the ratio of the 100HZ signal content to the ultrasonic signal amplitude;
step (11): judging whether the ratio of the 50HZ signal content to the ultrasonic signal amplitude is larger than a second ratio reference value or not, if so, entering a step (13), and if not, entering a step (12);
step (12): judging whether the ratio of the 100HZ signal content to the ultrasonic signal amplitude is greater than a third ratio reference value or not, if so, entering a step (13), otherwise, entering a step (16) if the high-voltage GIS equipment has a discharge fault;
step (13): calculating the interval of the two ultrasonic signals;
step (14): judging whether the interval is less than 50ms and the amplitude of the ultrasonic signal is less than 40mV, if so, damaging particles in the high-voltage GIS equipment, and entering the step (16); if not, the particles in the high-voltage GIS equipment are not harmful temporarily, and the step (16) is carried out;
step (15): judging whether the interval is more than 50ms and less than 100ms and the amplitude of the ultrasonic signal is less than 20mV, if so, damaging particles in the high-voltage GIS equipment, entering a step (16), and if not, temporarily preventing the particles in the high-voltage GIS equipment from being damaged, entering the step (16);
step (16): and (4) judging whether to continue detection, if so, returning to the step (1), and if not, ending.
2. The insulation detection method for the high-voltage GIS equipment according to claim 1, characterized in that the internal ultrasonic signals are collected by an ultrasonic sensor, and the ultrasonic sensor is mounted on the metal shell of the GIS equipment through a coupling agent.
3. The insulation detection method for the high-voltage GIS equipment according to claim 1, characterized in that the first ratio reference value, the second ratio reference value and the third ratio reference value are 10%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010804681.2A CN111965503A (en) | 2020-08-12 | 2020-08-12 | Insulation detection method for high-voltage GIS equipment |
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| CN202010804681.2A CN111965503A (en) | 2020-08-12 | 2020-08-12 | Insulation detection method for high-voltage GIS equipment |
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| CN111965503A true CN111965503A (en) | 2020-11-20 |
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| CN202010804681.2A Pending CN111965503A (en) | 2020-08-12 | 2020-08-12 | Insulation detection method for high-voltage GIS equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113820572A (en) * | 2021-09-16 | 2021-12-21 | 国网江苏省电力有限公司盐城供电分公司 | SF6 distribution transformer insulation detection method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102539527A (en) * | 2010-12-27 | 2012-07-04 | 湖北省电力试验研究院 | GIS (gas insulated substation) partial discharge mode identification method based on ultrasonic testing |
| WO2015063172A1 (en) * | 2013-10-31 | 2015-05-07 | Alstom Technology Ltd | Method of detecting partial discharge in a gas insulated high voltage electrical substation |
| CN106154131A (en) * | 2016-08-23 | 2016-11-23 | 莱芜鲁能开源电力建设有限公司 | A kind of detection method for GIS device |
| CN107942207A (en) * | 2017-10-22 | 2018-04-20 | 国网山西省电力公司电力科学研究院 | GIS breaker gas chamber fault detection of local discharge and type judgement method |
-
2020
- 2020-08-12 CN CN202010804681.2A patent/CN111965503A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102539527A (en) * | 2010-12-27 | 2012-07-04 | 湖北省电力试验研究院 | GIS (gas insulated substation) partial discharge mode identification method based on ultrasonic testing |
| WO2015063172A1 (en) * | 2013-10-31 | 2015-05-07 | Alstom Technology Ltd | Method of detecting partial discharge in a gas insulated high voltage electrical substation |
| CN106154131A (en) * | 2016-08-23 | 2016-11-23 | 莱芜鲁能开源电力建设有限公司 | A kind of detection method for GIS device |
| CN107942207A (en) * | 2017-10-22 | 2018-04-20 | 国网山西省电力公司电力科学研究院 | GIS breaker gas chamber fault detection of local discharge and type judgement method |
Non-Patent Citations (3)
| Title |
|---|
| 司文荣 等: "超声检测进行气体绝缘组合电器典型绝缘缺陷识别", 《高压电器》 * |
| 张琦 等: "基于偏度和峰度指标的GIS压力异常改进判据研究", 《电工电气》 * |
| 谭向宇 等: "GIS内金属性缺陷引起的局部放电超声信号分布特性研究", 《高压电器》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113820572A (en) * | 2021-09-16 | 2021-12-21 | 国网江苏省电力有限公司盐城供电分公司 | SF6 distribution transformer insulation detection method |
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Application publication date: 20201120 |