CN210720633U - GIS partial discharge detection device based on flange bolt - Google Patents
GIS partial discharge detection device based on flange bolt Download PDFInfo
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- CN210720633U CN210720633U CN201921533492.5U CN201921533492U CN210720633U CN 210720633 U CN210720633 U CN 210720633U CN 201921533492 U CN201921533492 U CN 201921533492U CN 210720633 U CN210720633 U CN 210720633U
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Abstract
The utility model relates to a GIS partial discharge detection device based on ring flange bolt, including GIS equipment, with GIS equipment interconnect's pulse current sensor and with pulse current sensor interconnect's caliber, GIS equipment include a plurality of interconnect's GIS casing, set up in the ring flange at GIS casing both ends, ring flange bolt, gasket, nut and set up respectively in the inside and interconnect's of GIS casing basin formula insulator and bus bar guide arm, GIS casing and basin formula insulator pass through ring flange and ring flange bolt interconnect, gasket and nut set up respectively in the both ends of ring flange bolt, pulse current sensor passes through the ring flange bolt and installs in the side of ring flange, GIS casing, ring flange, nut, gasket, ring flange bolt and pulse current sensor metal casing form pulse current circulation route. Compared with the prior art, the utility model has the advantages of be applicable to multiple spot ground connection GIS equipment.
Description
Technical Field
The utility model belongs to the technical field of GIS equipment partial discharge detection and specifically relates to a GIS partial discharge detection device based on ring flange bolt is related to.
Background
GIS, i.e., gas insulated metal-enclosed switchgear, is high-voltage electrical equipment having high operational reliability, small maintenance workload, and long overhaul period, and is electrical equipment that is used in large quantities in the current electrical power system, and therefore effective maintenance and safe operation of GIS equipment are very important for the electrical power system.
The GIS equipment comprises functional units such as a bus, a circuit breaker, a disconnecting switch, a grounding switch, a current transformer, a voltage transformer, a lightning arrester and the like. High insulation strength for GIS equipmentSF of6The gas is used as an insulating medium and a breaker arc extinguishing medium, and all high-voltage elements are sealed in the shell, so that the compactness of the GIS equipment is realized. But due to SF6Leakage of gas, permeation of external moisture, existence of conductive impurities, aging of insulators and the like can cause internal flashover faults, and the insulating performance of GIS equipment is reduced.
Operation experience shows that the GIS equipment fault caused by the reduction of the insulation performance accounts for a larger proportion of the occurrence of the GIS equipment fault, so that in order to prevent the system from generating the fault due to the reduction of the insulation performance, the insulation detection of the GIS equipment and the real-time monitoring of the insulation condition inside the GIS equipment are necessary in actual operation. Various potential defects in the GIS equipment can cause partial discharge in different degrees, and long-term discharge can cause insulation degradation and gradual expansion, even cause whole insulation breakdown or surface flashover, thereby causing great threat to the safe operation of the equipment, causing system power failure and the like caused by operation faults, and causing great loss.
At present, tests of GIS equipment in the power industry mainly focus on how to find internal insulation defects, the tests comprise an alternating current withstand voltage factory test and an on-site switching alternating current withstand voltage test, the tests are all local discharge pulse current detection technologies based on off-line GIS equipment, local discharge of the GIS equipment can cause pulse current signals to be generated inside the GIS equipment, a pulse current method is the only local discharge detection technology with international and national standards at present, and information such as discharge quantity, discharge phase, discharge frequency and the like of pulse current is obtained by obtaining the pulse current measured by measuring impedance on a coupling capacitor side or obtaining the pulse current measured by a Rogowski coil from a neutral point or a grounding point of the power equipment. This detection technique is illustrated in fig. 1. According to the detection technology, the GIS equipment is required to build a coupling capacitive voltage divider before installation and operation in a laboratory or on site, and single-point grounding is carried out, so that a local discharge pulse current signal is coupled from a grounding wire. However, most GIS devices in live operation are grounded at multiple points, and therefore, the technique shown in fig. 1 cannot be used to detect the partial discharge pulse current of the GIS device.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a GIS partial discharge detection device based on ring flange bolt in order to overcome the defect that above-mentioned prior art exists.
The purpose of the utility model can be realized through the following technical scheme:
a GIS partial discharge detection device based on flange bolts comprises GIS equipment, a pulse current sensor connected with the GIS equipment and a measurer connected with the pulse current sensor, the GIS equipment comprises a plurality of mutually connected GIS shells, flange plates, flange plate bolts, gaskets and screw caps which are arranged at two ends of the GIS shells, and basin-type insulators and bus bar guide rods which are respectively arranged in the GIS shells and are mutually connected, the GIS shell and the basin-type insulator are mutually connected through a flange plate and a flange plate bolt, the gasket and the nut are respectively arranged at two ends of the flange plate bolt, the pulse current sensor is arranged on the side face of the flange plate through a flange plate bolt, and the GIS shell, the flange plate, the nut, the gasket, the flange plate bolt and the metal shell of the pulse current sensor form a pulse current circulation path.
Preferably, the gasket is arranged between the nut and the outer side surface of the flange plate, and the pulse current sensor is arranged between the outer side surface of the flange plate and the gasket.
Preferably, the pulse current circulation path passes through the GIS shell, the flange plate, the gasket, the nut and the flange plate bolt on one side of the flange plate bolt in sequence, and then passes through the nut, the gasket, the flange plate, the metal shell of the pulse current sensor and the GIS shell on the other side of the flange plate bolt in sequence.
Preferably, the pulse current signal passes through the pulse current sensor while flowing from one end of the flange bolt to the other end along the pulse current circulation path.
Preferably, the pulse current sensor is arranged at one end of a flange bolt.
Preferably, the pulse current sensor is a rogowski coil HFCT.
Compared with the prior art, the utility model has the advantages of it is following:
1) the utility model discloses in the GIS equipment according to multiple spot ground connection, do not establish the insulation between the ring flange of two mutual series connection shells, and through the characteristics that fixing bolt switches on, install luo shi coil HFCT between ring flange and gasket, utilize the pulse current circulation route of two GIS casings at the ring flange junction, directly carry out the survey of pulse current and get, and need not single-point ground connection, solved GIS equipment and installed the back live working of transformer substation and be multiple spot ground connection, make the scene can't develop the problem that GIS equipment partial discharge's pulse current detected;
2) the utility model discloses carry out the installation of luo shi coil HFCT based on the ring flange bolt, the luo shi coil HFCT who installs is external, and simple to operate, and does not destroy GIS equipment original seal structure and the insulating design of inside, can install under the current operation maintenance guide;
3) the utility model provides a live-line detection equipment or on-line monitoring equipment can be chooseed for use to the caliber, when chooseing for use on-line detection equipment, through keeping being connected between coaxial cable and the luo shi coil HFCT, the pulse current signal on the pulse current circulation route produces the condition in the real-time supervision GIS equipment, does not influence the normal operation of GIS equipment, improves the utility model discloses the adaptability and the practicality of device.
Drawings
Fig. 1 is a schematic diagram of a conventional offline GIS partial discharge pulse current detection device;
FIG. 2 is a schematic diagram of the present invention;
FIG. 3 is a single pulse current waveform generated by partial discharge of a GIS guide rod tip burr defect collected by the utility model;
figure 4 is using the utility model discloses the PRPD spectrogram that the most advanced burr defect partial discharge of GIS guide arm produced of collection.
The device comprises a pulse current sensor (Rogowski coil HFCT), a gasket, a nut, a flange plate bolt, a GIS shell, a pulse current flow path, a disc insulator, a bus bar guide rod, a coaxial cable, a measurer, a flange plate and a controller, wherein the pulse current sensor (Rogowski coil HFCT) 2, the gasket 3, the nut 4, the flange plate bolt 5, the GIS shell 6, the pulse current flow path 7, the disc insulator 8.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Example 1
As shown in fig. 2, the utility model provides a GIS partial discharge detection device based on ring flange bolt, generally include ring flange 10, pulse current sensor (rogowski coil HFCT)1, gasket 2, nut 3, the bolt, GIS casing 5, basin formula insulator 7, bus bar guide 8, coaxial cable 9 and caliber 10, GIS casing 5, ring flange 10, nut 3, gasket 2 and ring flange bolt 4 form pulse current circulation route 6 jointly, explain the concrete position and the connection of each part below:
a plurality of GIS shells 5 establish ties each other, GIS shell 5's both ends are equipped with ring flange 11, basin formula insulator 7 and bus bar guide rod 8 set up in GIS shell 5 and interconnect, basin formula insulator 7 is connected with GIS shell 5 through ring flange 10 and flange bolt 4, gasket 2 and nut 3 set up respectively in the both ends of flange bolt 4, guarantee the sealing performance of GIS equipment, constitute GIS equipment from this, luo shi coil HFCT installs in the lateral surface of ring flange 10 through flange bolt 4 as pulse current sensor 1, the installation is accomplished the back, ring flange 10, gasket 2, luo shi coil HFCT 1 and nut 3's position relation is: a gasket 2 is arranged between the nut 3 and the flange plate 10, and a pulse current sensor 1 is arranged between the gasket 2 and the flange plate 10. A pulse current circulation path 6 formed by the GIS shell 5, the flange plate 10, the nut 3, the gasket 2, the metal shell of the pulse current sensor 1 and the flange plate bolt 4 passes through the pulse current sensor 1, and the pulse current sensor 1 is connected with a measurer 10 through a coaxial cable 9.
In this embodiment, only one pulse current sensor 1 is provided at one end of one of the flange bolts 4.
The pulse current circulation path 6 passes through the GIS shell 5, the flange plate 10, the gasket 2, the nut 3 and the flange plate bolt 4 on one side of the flange plate bolt 4 in sequence, then passes through the nut 3, the gasket 2, the flange plate 10, the metal shell of the pulse current sensor 1 and the GIS shell 5 on the other side of the flange plate bolt 4 in sequence, when partial discharge occurs in GIS equipment and a pulse current signal is generated on the GIS shell 5, the pulse current signal flows along the pulse current circulation path 6 and flows from the GIS shell 5 on one side to the GIS shell 5 on the other side, and when the pulse current signal flows from one end of the flange plate bolt 4 to the other end along the pulse current circulation path 6, the pulse current signal simultaneously passes through the pulse current sensor 1, and the pulse current sensor 1 converts the pulse current signal into a voltage signal.
The operating characteristics of the pulse current sensor 1 meet the requirements of the local discharge pulse current method: when the detection frequency band is less than 1M, a conventional pulse current method is adopted; when the detection frequency band is 3MHz-30MHz, high frequency pulse current method is adopted. The size parameters of the pulse current sensor 1 are matched with the sizes of the gasket 2, the nut 3 and the bolt.
The single-point grounding mode is that one end of each segment of the GIS shell is provided with insulation, the other end of each segment adopts single-point grounding, generally, two shells connected in series are insulated at a flange, and the shells are insulated with the ground at a shell support. The multipoint grounding mode is that in a certain section of the GIS shell, more than two points of multipoint grounding conductors are adopted to connect the shell and the ground, generally, structurally, a shell support is not insulated, and the flanges of two shells connected in series are not insulated and are conducted through by fixing bolts.
The main principle of the utility model is that: partial discharge generated by internal defects of the GIS equipment can generate weak pulse current signals on the GIS shell 5 through capacitance between the bus bar guide rod 8 and the shell, the pulse current signals sequentially pass through the GIS shell 5, the flange plate 10, the gasket 2, the nut 3 and the flange plate bolt 4 on one side of the flange plate bolt 4, then sequentially pass through the nut 3 and the gasket 2 on the other side of the flange plate bolt 4, and finally flow to the GIS shell 5 on the other side of the flange plate 10, so that a passage is formed. Therefore, the pulse current sensor 1 is additionally arranged on the bolt, so that a pulse current signal can be converted into a voltage signal, the voltage signal is transmitted to the measurer 10, and the GIS equipment local discharge pulse current live detection and online monitoring device based on the flange bolt 4 is formed.
The utility model discloses the theory of operation as follows:
1) the local discharge inside the GIS equipment generates a pulse current signal on the GIS shell 5;
2) the pulse current signal flows from the GIS shell 5 on one side to the GIS shell 5 on the other side along the pulse current circulation path 6 and simultaneously flows through the pulse current sensor 1, and the pulse current sensor 1 converts the pulse current signal into a voltage signal;
4) the voltage signal is transmitted to the measurer 10 through the coaxial cable 9;
5) the measurer 10 measures parameters of the received voltage signal, and detects the partial discharge condition inside the GIS device according to the parameters of the voltage signal.
In this embodiment, the measurer 10 is an electrified detection device, and is configured to perform inspection detection on a local discharge pulse current signal of the GIS device, and when the measurer 10 is in inspection, the coaxial cable 9 is in butt joint with the pulse current sensor 1, and the voltage signal into which the pulse current signal is converted by the pulse current sensor 1 is collected, and when the work is finished, the coaxial cable 9 is disconnected from the pulse current sensor 1.
Example 2
In this embodiment, the measurer 10 is an online monitoring device, and is configured to perform online monitoring on a partial discharge pulse current signal of the GIS device, where the measurer 10 is always connected to the pulse current sensor 1 through the coaxial cable 9, and monitors a voltage signal into which the pulse current signal is converted by the pulse current sensor 1 in real time.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope of the present invention, and these modifications or replacements should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. A GIS partial discharge detection device based on flange plate bolts comprises GIS equipment, a pulse current sensor connected with the GIS equipment and a measurer (10) connected with the pulse current sensor, wherein the GIS equipment comprises a plurality of GIS shells (5) connected with each other, flange plates (11) arranged at two ends of the GIS shells (5), flange plate bolts (4), gaskets (2), screw caps (3), and basin-type insulators (7) and bus bar guide rods (8) which are respectively arranged inside the GIS shells (5) and connected with each other, the GIS shells (5) and the basin-type insulators (7) are connected with each other through the flange plates (11) and the flange plate bolts (4), the gaskets (2) and the screw caps (3) are respectively arranged at two ends of the flange plate bolts (4), and the GIS partial discharge detection device is characterized in that the pulse current sensor is arranged on the side surface of the flange plates (11) through the flange plate bolts (4), the GIS shell (5), the flange plate (11), the screw cap (3), the gasket (2), the flange plate bolt (4) and the metal shell of the pulse current sensor (1) form a pulse current circulation path (6).
2. The GIS partial discharge detection device based on flange bolts of claim 1, wherein the gasket (2) is arranged between the nut (3) and the outer side surface of the flange (11), and the pulse current sensor (1) is arranged between the outer side surface of the flange (11) and the gasket (2).
3. The GIS partial discharge detection device based on flange bolts according to claim 2, wherein the pulse current flow path (6) passes through the GIS case (5), the flange (11), the gasket (2), the nut (3) and the flange bolt (4) on one side of the flange bolt (4) in sequence, then passes through the nut (3), the gasket (2), the flange (11), the metal shell of the pulse current sensor (1) and the GIS case (5) on the other side of the flange bolt (4) in sequence, and when partial discharge occurs inside the GIS device and a pulse current signal is generated on the GIS case (5), the pulse current signal flows along the pulse current flow path (6) and flows from the GIS case (5) on one side to the GIS case (5) on the other side.
4. The GIS partial discharge detection device based on flange bolts of claim 3, wherein the pulse current signal passes through the pulse current sensor (1) while flowing from one end of the flange bolt (4) to the other end along the pulse current circulation path (6).
5. A GIS partial discharge detector based on flange bolts according to claim 4, characterized in that said pulse current sensor (1) is installed at one end of a flange bolt (4).
6. The GIS partial discharge detection device based on flange bolts of claim 5, wherein the pulse current sensor (1) is a Rogowski coil HFCT.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921533492.5U CN210720633U (en) | 2019-09-16 | 2019-09-16 | GIS partial discharge detection device based on flange bolt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921533492.5U CN210720633U (en) | 2019-09-16 | 2019-09-16 | GIS partial discharge detection device based on flange bolt |
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| Publication Number | Publication Date |
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| CN210720633U true CN210720633U (en) | 2020-06-09 |
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| CN201921533492.5U Active CN210720633U (en) | 2019-09-16 | 2019-09-16 | GIS partial discharge detection device based on flange bolt |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110426616A (en) * | 2019-09-16 | 2019-11-08 | 国网上海市电力公司 | A kind of GIS partial discharge detection device and method based on flange plate bolt |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110426616A (en) * | 2019-09-16 | 2019-11-08 | 国网上海市电力公司 | A kind of GIS partial discharge detection device and method based on flange plate bolt |
| WO2021052036A1 (en) * | 2019-09-16 | 2021-03-25 | 国网上海市电力公司 | Gis partial discharge detecting device and method based on flange bolts |
| CN110426616B (en) * | 2019-09-16 | 2024-08-20 | 国网上海市电力公司 | GIS partial discharge detection device and method based on flange bolts |
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