CN107677938A - Extra-high-voltage alternating current mixed gas GIL line segment Partial discharge signal measuring methods - Google Patents

Abstract

The invention relates to a method for measuring partial discharge signals of a UHV AC mixed gas GIL line section, which utilizes the structure of the UHV AC mixed gas GIL electrified assessment line section, collects PD signals according to each gas chamber, and records and records the collected PD signals. Analyze and judge the state of UHV mixed gas GIL. The invention can check whether the insulation defect occurs in the operation process of the ultra-high voltage GIL, and effectively improves the operation reliability of the ultra-high voltage AC GIL.

Description

Measurement method of partial discharge signal in UHV AC mixed gas GIL line section

technical field

The invention relates to the field of electric power transmission, in particular to a method for measuring a partial discharge signal of a UHV AC mixed gas GIL line segment.

Background technique

GIL (gas _- insulated metal enclosed transmission line) is the abbreviation of gas-insulated metal enclosed AC mixed gas transmission line. Power transmission equipment has the remarkable advantages of large power transmission capacity, small footprint, flexible layout, high reliability, low maintenance, long life, and low environmental impact. At present, the high-pressure GIL technology is basically mastered by several large European and American companies such as ABB, Siemens, and AZZ of the United States. Their latest GIL products have realized component standardization and modular design, can be flexibly bent along the path, and use mixed gases such as N ₂ /SF ₆ In order to achieve cost saving and environmental protection effects, the American AZZ company has successfully developed a 1200 kV UHV mixed gas GIL. However, my country's GIL products are still in a blank state. For example, the 750kV GIL of the Yellow River Laxiwa Hydropower Station and the 550kV GIL of the Xiluodu Hydropower Station all use foreign products.

In recent years, my country's gradually enhanced smart grid construction and large energy base construction have significantly increased the demand for GIL products and projects, especially the UHV mixed gas GIL has become an important solution for the UHV Huainan-Nanjing-Shanghai project across the Yangtze River tunnel power transmission At present, my country has developed an UHV AC GIL based on mixed gas insulation, in which the mixed gas includes SF6 and N2, and it has been hung in the UHV project. However, there are still many problems in the current application of UHV mixed gas GIL engineering, especially the internal insulation defects are not easy to find. The monitoring of partial discharge signals is an effective way to find internal insulation faults. In order to ensure the reliability of equipment operation, Real-time monitoring of partial discharge signals is required, but there is currently no online monitoring method for partial discharge for UHV gas mixture GIL.

Contents of the invention

For this reason, the technical problem to be solved by the present invention is to overcome the problem of poor operation stability of the UHV AC GIL in the prior art so as to provide a UHV AC mixed gas GIL line section that can ensure the operation stability of the UHV AC GIL. put signal measurement method.

In order to solve the above technical problems, a method for measuring the partial discharge signal of the UHV AC mixed gas GIL line segment of the present invention, wherein the UHV AC mixed gas GIL line segment forms a loop, the steps are as follows: Step S1: the UHV AC Apply rated voltage and rated current to the mixed gas GIL line section to form a UHV AC mixed gas GIL electrification assessment line section; Step S2: Utilize the structure of the UHV AC mixed gas GIL electrification assessment line section, and collect partial discharge signals according to each gas chamber; step S3: Record and analyze the collected partial discharge signals, and judge the state of the UHV mixed gas GIL.

In one embodiment of the present invention, in the step S1, a rated voltage and a rated current are applied to the UHV AC mixed gas GIL line segment for one year.

In one embodiment of the present invention, in the step S2, the electrification test line section of the UHV AC mixed gas GIL includes a plurality of different units, and the gas chamber is composed of one or more different units.

In one embodiment of the present invention, the electrification assessment line section of the UHV AC mixed gas GIL includes a compensation unit, a straight line unit, an ascending unit, a corner unit, a descending unit, and an orientation unit, wherein the compensation unit communicates with the straight line unit The ascending unit is connected, the ascending unit is connected with the descending unit through the corner unit, and the descending unit is connected with the orientation unit.

In one embodiment of the present invention, collecting PD signals according to each gas chamber is to install PD sensors on the outside of the GIL shell near the basin insulator of each gas chamber to collect PD signals.

In one embodiment of the present invention, a plurality of partial discharge sensors are provided on the outer side of the GIL shell along a section.

In one embodiment of the present invention, in the step S3, the collected partial discharge signal is transmitted to the partial discharge on-line test device, and the collected partial discharge signal is recorded and analyzed by the partial discharge on-line test device to accurately respond The state of the UHV mixed gas GIL.

The above technical solution of the present invention has the following advantages compared with the prior art:

The method for measuring the partial discharge signal of the UHV AC mixed gas GIL line segment according to the present invention utilizes the structure of the UHV AC mixed gas GIL electrified assessment line segment, and installs a high-precision PD sensor near the basin-type insulator of each gas chamber, and each Multiple sensors are placed on each installation section to collect multi-dimensional partial discharge signals, so as to judge the state of UHV mixed gas GIL and the cause of possible insulation failures. The invention is beneficial for staff to know the state of the ultra-high pressure mixed gas GIL in time, and effectively improves the operation reliability of the ultra-high pressure mixed gas GIL.

Description of drawings

In order to make the content of the present invention more easily understood, the present invention will be described in further detail below according to specific embodiments of the present invention in conjunction with the accompanying drawings, wherein

Fig. 1 is the flow chart of the method for measuring the partial discharge signal of the UHV AC mixed gas GIL line section of the present invention;

Fig. 2 is a schematic diagram of the connection of the detection partial discharge signal of the ultra-high voltage AC mixed gas GIL electrified examination line section of the present invention.

detailed description

Please refer to FIG. 1 , the present embodiment provides a method for measuring partial discharge signals of a UHV AC mixed gas GIL line section, wherein the UHV AC mixed gas GIL line section forms a loop, and the steps are as follows: Step S1: the special Apply rated voltage and rated current to the high-voltage AC mixed gas GIL line section to form a UHV AC mixed gas GIL electrification assessment line section; Step S2: Use the structure of the UHV AC mixed gas GIL electrification assessment line section to collect partial discharge signals according to each gas chamber ; Step S3: Record and analyze the collected partial discharge signal to determine the state of the UHV mixed gas GIL.

The above is the core technical field of the present invention. The method for measuring the partial discharge signal of the UHV AC mixed gas GIL line section of the present invention, wherein the UHV AC mixed gas GIL line section forms a loop, and in the step S1, the The UHV AC mixed gas GIL line section is applied with rated voltage and rated current to form a UHV AC mixed gas GIL electrification assessment line segment, which is conducive to simulating the real situation of on-site operation; in the step S2, the structure of the UHV AC mixed gas GIL electrification assessment line segment , carry out the collection of partial discharge signal according to each gas chamber, in order to measure the partial discharge signal accurately; In the described step S3, record and analyze the partial discharge signal collected, judge the state of UHV mixed gas GIL, thereby have It is beneficial for the staff to know the fault location of the UHV mixed gas GIL in time, and effectively improves the operation reliability of the UHV mixed gas GIL.

In order to simulate the real situation of on-site operation, in the step S1, a rated voltage and rated current are applied to the UHV AC mixed gas GIL line section 10 for a long time to form a UHV AC mixed gas GIL charged assessment line section. Specifically, the rated voltage and rated current are applied to the UHV AC mixed gas GIL line segment for one year, which is conducive to the formation of the UHV AC mixed gas GIL charged assessment line segment.

In the step S2, the UHV AC mixed gas GIL charged assessment line segment includes a plurality of different units, and the plurality of different units divide the UHV AC mixed gas GIL line segment according to length, generally including compensation unit, a straight line unit connected to the compensation unit, a rising unit connected to the straight line unit, a corner unit connected to the rising unit, a descending unit connected to the corner unit, and an orientation unit connected to the descending unit unit, etc., wherein the compensation unit is used to compensate for the relative displacement of the GIL when the ambient temperature changes and adopts a unit structure; the linear unit refers to a unit structure adopted by the GIL when it is installed in a straight line; the rising unit It refers to a unit structure adopted by GIL in the application and installation of uphill or inclined shaft; the corner unit refers to a unit structure adopted by GIL in the corner installation; the descending unit refers to the application and installation of GIL in downhill A unit structure adopted during the time; the directional unit is used for isolation and connection between two other different units, mainly for long-distance GIL field tests. The gas chamber is composed of one or more units, which facilitates the collection of partial discharge signals on the high-voltage AC mixed gas GIL line section 10 .

As shown in Figure 2, the collection of partial discharge signals according to each gas chamber is to install a partial discharge sensor 12 on the GIL shell near the pot insulator 11 of each gas chamber of the UHV AC mixed gas GIL line section 10 The PD signal is collected outside, and the PD signal can be monitored through the PD sensor 12 . Wherein the pot insulator 11 is arranged at both ends of each air chamber, and is used for fixing the intermediate conductor in the shell of the GIL to avoid contact with the shell. In this embodiment, multi-dimensional monitoring is performed on the entire length of the 100-meter ultra-high voltage mixed gas GIL line section 10, which is beneficial for analysis and research to grasp the state of the internal insulation of the UHV mixed gas GIL. In order to accurately measure PD signals, a plurality of PD sensors 12 are arranged on the outer side of the GIL shell along the section, for example, three PD sensors 12 are arranged along the section, so that PD signals in various directions can be accurately reflected.

In the step S3, the PD sensor 12 is connected to the PD on-line testing device 13, and the PD signal collected by the PD sensor 12 is transmitted to the PD on-line testing device 13, and passed the PD on-line testing The device 13 records and analyzes the collected partial discharge signals to accurately reflect the state of the UHV mixed gas GIL.

In summary, the technical solution of the present invention has the following advantages:

1. The method for measuring the partial discharge signal of the UHV AC mixed gas GIL line section of the present invention, in the step S1, applying a rated voltage and a rated current to the UHV AC mixed gas GIL line section to form a UHV AC mixed gas GIL electrification assessment The line segment is conducive to simulating the real situation of on-site operation; in the step S2, the structure of the line segment is assessed by using the ultra-high voltage AC mixed gas GIL charged, and the partial discharge signal is collected according to each gas chamber, so as to accurately measure the partial discharge signal; In the above step S3, the collected partial discharge signal is recorded and analyzed to determine the state of the UHV mixed gas GIL, thereby helping the staff to know the location of the UHV mixed gas GIL failure in time, and effectively improving the UHV mixed gas GIL. operational reliability.

2. The method for measuring the partial discharge signal of the UHV AC mixed gas GIL line section of the present invention, according to each gas chamber, the collection of the partial discharge signal is a basin insulator in each gas chamber of the UHV AC mixed gas GIL line section Nearby, a partial discharge sensor is installed outside the GIL shell to collect partial discharge signals, and the partial discharge signals can be monitored by the partial discharge sensor. Wherein the pot insulators are arranged at the first and last ends of each air chamber, and are used to fix the intermediate conductor located in the shell of the GIL and avoid contact with the shell.

Apparently, the above-mentioned embodiments are only examples for clear description, and are not intended to limit the implementation. For those of ordinary skill in the art, on the basis of the above description, other changes or changes in various forms can also be made. It is not necessary and impossible to exhaustively list all the implementation manners here. And the obvious changes or changes derived therefrom are still within the scope of protection of the present invention.

Claims (7)

1. A method for measuring partial discharge signal of a UHV AC mixed gas GIL line section, wherein the UHV AC mixed gas GIL line section forms a loop, and the steps are as follows: Step S1: Applying a rated voltage and a rated current to the UHV AC mixed gas GIL line segment to form a UHV AC mixed gas GIL charged assessment line segment; Step S2: Use UHV AC mixed gas GIL to assess the structure of the line segment, and collect partial discharge signals according to each gas chamber; Step S3: Record and analyze the collected partial discharge signals to determine the state of the UHV mixed gas GIL. 2. The method for measuring the partial discharge signal of the UHV AC mixed gas GIL line segment according to claim 1, characterized in that: in the step S1, a rated voltage and a rated current are applied to the UHV AC mixed gas GIL line segment. time of year. 3. The method for measuring partial discharge signals of the UHV AC mixed gas GIL line section according to claim 1, characterized in that: in the step S2, the UHV AC mixed gas GIL electrification assessment line section includes a plurality of different units, The gas chamber is composed of one or more different units. 4. The method for measuring the partial discharge signal of the UHV AC mixed gas GIL line section according to claim 3, wherein: the UHV AC mixed gas GIL electrification assessment line section includes a compensation unit, a straight line unit, a rising unit, a corner unit, A descending unit and an orientation unit, wherein the compensation unit is connected to the ascending unit through the straight line unit, the ascending unit is connected to the descending unit through the corner unit, and the descending unit is connected to the orientation unit. 5. The method for measuring partial discharge signals of UHV AC mixed gas GIL line section according to claim 1 or 3, characterized in that: the collection of partial discharge signals according to each gas chamber is near the basin insulator of each gas chamber The partial discharge sensor is installed on the outside of the GIL shell to collect partial discharge signals. 6 . The method for measuring partial discharge signals of UHV AC mixed gas GIL line section according to claim 5 , wherein a plurality of partial discharge sensors are arranged on the outer side of the GIL shell along the section. 6 . 7. The method for measuring the partial discharge signal of the UHV AC mixed gas GIL line section according to claim 1, characterized in that: in the step S3, the collected partial discharge signal is transmitted to the partial discharge on-line test device, and the partial discharge signal is passed through the partial discharge test device. The on-line test device records and analyzes the collected partial discharge signals, and accurately reflects the state of the UHV mixed gas GIL.