CN113075519A - Device for GIL partial discharge monitoring and arc fault positioning - Google Patents
Device for GIL partial discharge monitoring and arc fault positioning Download PDFInfo
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- CN113075519A CN113075519A CN202110538140.4A CN202110538140A CN113075519A CN 113075519 A CN113075519 A CN 113075519A CN 202110538140 A CN202110538140 A CN 202110538140A CN 113075519 A CN113075519 A CN 113075519A
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- G—PHYSICS
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- 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
- G01R31/1209—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 using acoustic measurements
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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
- G01R31/1263—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 solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—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 solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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Abstract
The invention discloses a device for GIL partial discharge monitoring and arc fault location, which relates to the field of electrical appliance fault detection, wherein each GIL comprises a plurality of substations, each substation is provided with a partial discharge acquisition mechanism and a fault location mechanism, and the partial discharge acquisition mechanism and the fault location mechanism are connected with a work center through a main server; a plurality of partial discharge sensors are uniformly distributed in the GIL corresponding to each substation, and all the partial discharge sensors are connected with corresponding partial discharge acquisition mechanisms; and a plurality of ultrasonic sensors are uniformly distributed on the GIL shell corresponding to each substation, and all the ultrasonic sensors are connected with corresponding fault positioning mechanisms. The invention can detect the fault type of the GIL and position the fault.
Description
Technical Field
The invention relates to the field of electric appliance fault detection, in particular to a device for GIL partial discharge monitoring and arc fault positioning.
Background
Gas-insulated transmission lines (GIL) are high-voltage and high-current electric energy transmission devices which adopt compressed gas (such as SF, SF mixed gas and the like) as an insulating material and are coaxially arranged by a shell and a conducting rod, compared with the traditional overhead line or transmission cable, the GIL is not influenced by environmental factors such as severe weather, special terrain and the like, can effectively utilize space resources, can share corridors or tunnels with telecommunication cables, oil and gas pipelines and the like, saves occupied land, meanwhile, the device also has the advantages of large transmission capacity, low unit loss, small environmental influence, high operation reliability, small electromagnetic influence reduction, low failure rate and the like, the method has important application value for promoting the construction of national energy transmission channels in the future and optimizing the layout of urban infrastructure, is a preferred mode of large-capacity and long-distance power transmission, and is widely applied to electric energy sending occasions of hydropower stations and nuclear power stations at present.
Because the GIL is mainly internally provided with a metal conductor, movable equipment such as a circuit breaker, a disconnecting switch and the like does not exist, the internal fault is usually an insulation fault, and if partial discharge or ground flashover occurs in the GIL, the internal fault cannot cause obvious external change due to the fact that the gas chamber of the GIL is large, so that the discharge characteristic cannot be immediately shown
Referring to fig. 1, the causes of the insulation fault mainly include: internal defects in castings of solid insulating materials such as epoxy cause electrical discharges; corona discharge induced by protrusions on the surface of the high voltage conductor; in the manufacturing, transportation, storage and field installation processes, due to factors such as process problems or carelessness in installation, metal particles and scraps remained in the GIL, mixing and improper assembly, discharge caused by insulation damage and the like, the potential defects can be developed into dangerous discharge channels in the operation process of the GIL, and finally cause insulation breakdown or earth flashover fault, which affects the safe and stable operation of the system and causes great direct and indirect economic loss.
The GIL partial discharge is monitored mainly by a pulse current method, an ultrahigh frequency method (UHF), an ultrasonic method, a chemical method or an optical method, wherein the pulse current method and the ultrahigh frequency method are electric measurement methods, and the ultrasonic method, the chemical monitoring method and the optical monitoring method are non-electric measurement methods.
The above monitoring method has the following defects: the pulse current method is simple in equipment and high in sensitivity, but cannot be used when the equipment is operated and cannot be used for fault location. The ultrahigh frequency method has high sensitivity and can be used for operating equipment, but has high cost. The ultrasonic wave sensitivity is high, the anti-electromagnetic interference capability is strong, but the signal attenuation is fast, the propagation rates of signals passing through different media are different, and the signals can be reflected at the boundaries of different materials, so that the signal mode is complex, and the accuracy is low. The chemical detection method is not affected by electromagnetic interference, but has poor sensitivity and cannot be monitored for a long time. The optical detection method is also not affected by electromagnetic interference, but has poor sensitivity and requires many sensors, and none of the above-mentioned monitoring methods can effectively detect the type and location of the fault of the GIL.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a device for GIL partial discharge monitoring and arc fault location, which can detect the fault type of the GIL and locate the fault.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
a device for GIL partial discharge monitoring and arc fault location is disclosed, each GIL comprises a plurality of sub-stations, each sub-station is provided with a partial discharge acquisition mechanism and a fault location mechanism, and the partial discharge acquisition mechanism and the fault location mechanism are connected with a work center through a main server;
a plurality of partial discharge sensors are uniformly distributed in the GIL corresponding to each substation, and all the partial discharge sensors are connected with corresponding partial discharge acquisition mechanisms; and a plurality of ultrasonic sensors are uniformly distributed on the GIL shell corresponding to each substation, and all the ultrasonic sensors are connected with corresponding fault positioning mechanisms.
Furthermore, the type of the partial discharge sensor is GOM5010-UHF-I, the frequency range of the partial discharge sensor is 300-2000 MHz, the sensitivity is less than 5Pc, and the equivalent height is greater than or equal to 14 mm.
Furthermore, the type of the ultrasonic sensor is GOM5011-AE, the collection frequency range is 50-200 MHz, and the measurement range is 0-10V.
Further, the ultrasonic sensor is connected with the fault positioning mechanism through a coaxial cable.
Further, the partial discharge sensor is connected with the partial discharge acquisition mechanism through a coaxial cable.
Further, the work center is provided with a monitoring host and a printing device.
Compared with the prior art, the invention has the advantages that:
according to the device for GIL partial discharge monitoring and arc fault positioning, partial discharge occurring in a pipe body of a GIL can be monitored by a partial discharge sensor and an ultrasonic sensor, a monitored discharge signal (frequency signal) is sent to a corresponding partial discharge acquisition mechanism by the partial discharge sensor, the acquired signal is processed by the partial discharge acquisition mechanism, and the discharge frequency, the discharge frequency and the discharge phase are output to a main server; the fault positioning mechanism can receive high-speed, multi-point and synchronous signal sampling of a plurality of corresponding ultrasonic sensors, filter and capture discharge characteristics, send corresponding characteristics to the main server, and the main server positions the fault through calculation and sends the fault to the work center.
Drawings
FIG. 1 is a schematic diagram of a partial discharge type structure of a GIL in an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an apparatus for GIL partial discharge monitoring and arc fault location;
FIG. 3 is a schematic diagram of a line fault traveling wave propagation process when a fault occurs in the first half of the GIL;
FIG. 4 is a schematic diagram of a line fault traveling wave propagation process when a fault occurs in the second half of the GIL;
in the figure: 1-a partial discharge acquisition mechanism, 2-a fault positioning mechanism, 3-a main server, 4-a partial discharge sensor and 5-an ultrasonic sensor.
Detailed Description
The embodiments of the present embodiment will be described in further detail below with reference to the accompanying drawings.
FIG. 1 is a graph of different types of partial discharges occurring at different locations in the GIL.
Referring to fig. 2, in the present embodiment, a device for GIL partial discharge monitoring and arc fault location is provided, because a line covered by each GIL is long, an area with a length of 10 to 100m is taken as a sub-station according to a distance, each GIL includes a plurality of sub-stations, each sub-station is provided with a partial discharge acquisition mechanism 1 and a fault location mechanism 2, the partial discharge acquisition mechanism 1 and the fault location mechanism 2 are both connected with a work center through a main server 3, and the work center is provided with a monitoring host and a printing device.
A plurality of partial discharge sensors 4 are uniformly distributed in the GIL corresponding to each substation, and all the partial discharge sensors 4 are connected with the corresponding partial discharge acquisition mechanisms 1; a plurality of ultrasonic sensors 5 are uniformly distributed on the GIL shell corresponding to each substation, all the ultrasonic sensors 5 are connected with the corresponding fault positioning mechanisms 2, and the ultrasonic sensors 5 are connected with the fault positioning mechanisms 2 through coaxial cables.
In the embodiment, the model of the partial discharge sensor 4 is GOM5010-UHF-I, the frequency range of the partial discharge sensor 4 is 300-2000 MHz, the sensitivity is less than 5Pc, and the equivalent height is greater than or equal to 14 mm; the type of the ultrasonic sensor 5 is GOM5011-AE, the acquisition frequency range is 50-200 MHz, and the measurement range is 0-10V.
When the partial discharge monitoring device is used, the partial discharge sensor 4 and the ultrasonic sensor 5 can monitor partial discharge occurring in the pipe body of the GIL, the partial discharge sensor 4 sends a monitored discharge signal frequency signal to the corresponding partial discharge acquisition mechanism 1, the partial discharge acquisition mechanism 1 processes the acquired signal, and the discharge frequency, the discharge frequency and the discharge phase are output to the main server 3; the fault locating mechanism 2 can receive high-speed, multi-point and synchronous signal sampling of a plurality of corresponding ultrasonic sensors 5, perform filtering and capture discharge characteristics, and send corresponding characteristics to the main server 3.
The work center uses the monitoring host and the printing equipment to process, diagnose and display the discharge frequency, the discharge frequency and the discharge phase sent by the local discharge acquisition mechanism 1, and uploads the diagnosis result through the IEC61850 communication protocol.
The monitoring host machine further has a remote client function, the real-time PRPS (Phase Resolved Partial Discharge) map Phase Resolved Partial Discharge of each monitoring point at the station end can be remotely checked, the monitoring results of the ultrasonic acquisition units are processed, diagnosed and displayed by the main server 3, the diagnosis results are uploaded through a communication protocol IEC61850/IEC104, and the main server 3 has a remote access function and can directly and remotely check real-time data.
And analyzing and comparing the result after diagnosis with a local discharge map of the expert database in the last 10 years, judging the most possible local discharge type according to the comparison, and adding the map with the fault to the expert database to expand the database.
Processing ultrasonic data, calculating and determining the position of the fault according to a first formula, wherein the first formula is as follows:
in formula I, t1Time, t, of the signal of the first ultrasonic sensor 52The time of the signal of the second ultrasonic sensor 5, T the time of the ultrasonic signal passing through the bellows at the joint, and V the ultrasonic signal atThe propagation velocity on the GIL housing, L is the distance of the fault point from the center of the adjacent ultrasonic sensor 5.
T is the relation among the corrugated pipe material, the length and the speed obtained through experimental simulation and field actual measurement optimization, then all data are fitted to obtain a relation between time and length, and the time required by passing through a connecting place when different materials and lengths are determined; v measures the speed of spreading on the sound wave casing through the time difference method before the installation, through the optimization to the junction for positioning system accuracy is higher, and the accuracy height reaches 1 m.
The installation steps of the device for GIL partial discharge monitoring and arc fault positioning are as follows:
s1: the partial discharge sensor 4 is installed at a reserved position on the GIL, and the hermeticity of the GIL is checked to prevent internal SF6The gas leaks.
S2: the ultrasonic sensor 5 is fixed to the surface of the housing of the GIL so that the ultrasonic sensor 5 is in close contact with the housing of the GIL.
S3: the partial discharge sensor 4 is connected with the corresponding partial discharge acquisition mechanism 1 through a coaxial cable, and the ultrasonic sensor 5 is connected with the corresponding fault positioning mechanism 2 through a coaxial cable.
S4: the partial discharge acquisition mechanism 1 and the fault positioning mechanism 2 are connected with a main server 3.
S5: the main server 3 is connected with the monitor terminal screen.
And the preceding formula
In contrast, the present embodiment also provides another method of calculating the location of the fault. The processed ultrasonic data determines the position of the fault through an algorithm, the algorithm is also added with the calculation of attenuation errors caused by telescopic joints with different numbers and lengths in the GIL, and the calculation formula is as follows:
(1) when the first half of the GIL fails, the line fault traveling wave propagation process is as shown in fig. 3. The first half refers to the portion of the line before the middle, and is only relative, with respect to the order in which the ultrasonic sensors are installed. t is ta<tcIn the first half.
At this time, the wave velocity and the failure start time t are calculated by equation (1)0：
Determining the fault position according to the formula (2) according to the GIL wave speed and the fault occurrence time:
d＝2l1+(ta-t0)v2 (2)
in the formula I1Is the distance between sensors a and b,/2Is the distance between sensors b and c, taTime from fault point to sensor a, tbTime from fault point to sensor b, t0As fault start time, tcTime from fault to sensor c, v2Is the propagation velocity.
(2) When a fault occurs in the second half of the GIL, the line fault traveling wave propagation process is as shown in fig. 4. The second half refers to the portion before the middle of the line, only relatively speaking, in relation to the order in which the ultrasonic sensors are installed, when ta>tcIn the second half.
At this time, the wave velocity and the failure start time t are calculated by the formula (3)0：
Determining the fault position according to the formula (4) according to the GIL wave speed and the fault occurrence time:
d＝2l1+l2+(tb-t0) (4)
in the formula I1Is the distance between sensors a and b,/2Is the distance between sensors b and c, taTime from fault point to sensor a, tbTime from fault point to sensor b, t0As fault start time, tcFor point-of-failure to sensorTime of c, v2Is the propagation velocity.
Through optimizing the connection part, the positioning system has higher accuracy which reaches 1 m. And finally, displaying the atlas, the partial discharge type, the fault position and the like obtained by analysis and calculation on a terminal screen, alarming and reminding operation and maintenance personnel of timely and accurate maintenance.
The present embodiment is not limited to the above-mentioned preferred embodiments, and any other products with various forms can be obtained from the teaching of the present embodiment, but any changes in the shape or structure thereof, which have the same or similar technical solutions as the present embodiment, are within the protection scope.
Claims (8)
1. A device for GIL partial discharge monitoring and arc fault location, each GIL comprising a plurality of substations, characterized by: each substation is provided with a partial discharge acquisition mechanism (1) and a fault positioning mechanism (2), and the partial discharge acquisition mechanism (1) and the fault positioning mechanism (2) are connected with a work center through a main server (3);
a plurality of partial discharge sensors (4) are uniformly distributed in the GIL corresponding to each substation, and all the partial discharge sensors (4) are connected with the corresponding partial discharge acquisition mechanism (1); a plurality of ultrasonic sensors (5) are uniformly distributed on the GIL shell corresponding to each substation, and all the ultrasonic sensors (5) are connected with corresponding fault positioning mechanisms (2).
2. The apparatus of claim 1, wherein the apparatus for GIL partial discharge monitoring and arc fault location comprises: the type of the partial discharge sensor (4) is GOM5010-UHF-I, the frequency range of the partial discharge sensor (4) is 300-2000 MHz, the sensitivity is less than 5Pc, and the equivalent height is greater than or equal to 14 mm.
3. The apparatus of claim 1, wherein the apparatus for GIL partial discharge monitoring and arc fault location comprises: the type of the ultrasonic sensor (5) is GOM5011-AE, the collection frequency range is 50-200 MHz, and the measurement range is 0-10V.
4. The apparatus of claim 1, wherein the apparatus for GIL partial discharge monitoring and arc fault location comprises: the ultrasonic sensor (5) is connected with the fault positioning mechanism (2) through a coaxial cable.
5. The apparatus of claim 1, wherein the apparatus for GIL partial discharge monitoring and arc fault location comprises: the partial discharge sensor (4) is connected with the partial discharge acquisition mechanism (1) through a coaxial cable.
6. The apparatus of claim 1, wherein the apparatus for GIL partial discharge monitoring and arc fault location comprises: the work center is provided with a monitoring host and printing equipment.
7. An apparatus for GIL partial discharge monitoring and arc fault location, comprising:
each GIL substation is provided with a partial discharge acquisition mechanism (1) and a fault positioning mechanism (2), and the partial discharge acquisition mechanism (1) and the fault positioning mechanism (2) are connected with a work center through a main server (3);
a plurality of partial discharge sensors (4) are uniformly arranged in each GIL substation, and all the partial discharge sensors (4) are connected with corresponding partial discharge acquisition mechanisms (1); a plurality of ultrasonic sensors (5) are uniformly arranged on the GIL shell corresponding to each GIL substation, and all the ultrasonic sensors (5) are connected with corresponding fault positioning mechanisms (2);
collecting discharge signals by using the partial discharge sensor (4) and/or the ultrasonic sensor (5) and generating a partial discharge map;
and comparing the partial discharge map with discharge maps corresponding to different discharge types in an expert database to determine the discharge type.
8. The apparatus of claim 7, wherein the distance L between the fault point and the center of the adjacent ultrasonic sensor is determined based on the following formula:
in formula I, t1Time of the first ultrasonic sensor signal, t2The time of the second ultrasonic sensor signal, T the time of the ultrasonic signal passing through the bellows at the junction, V the propagation speed of the ultrasonic signal on the GIL case, and L the distance between the fault point and the center of the adjacent ultrasonic sensor.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113702778A (en) * | 2021-08-10 | 2021-11-26 | 国网电力科学研究院武汉南瑞有限责任公司 | GIL arc discharge fault positioning method and system |
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Application publication date: 20210706 |