CN215575463U - UHF ultrahigh frequency partial discharge sensor - Google Patents
UHF ultrahigh frequency partial discharge sensor Download PDFInfo
- Publication number
- CN215575463U CN215575463U CN202120524116.0U CN202120524116U CN215575463U CN 215575463 U CN215575463 U CN 215575463U CN 202120524116 U CN202120524116 U CN 202120524116U CN 215575463 U CN215575463 U CN 215575463U
- Authority
- CN
- China
- Prior art keywords
- partial discharge
- base
- sensing
- sensor
- protection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Testing Relating To Insulation (AREA)
Abstract
The utility model relates to the field of partial discharge detection of high-voltage electrical equipment, in particular to a UHF ultrahigh frequency partial discharge sensor, wherein a sensing antenna is fixed in a protective cylinder by using hot melt adhesive, meanwhile, the chip is arranged in the protective cylinder, the chip and the sensing antenna can be prevented from being directly contacted with the transformer oil, the steel cylinder is sealed above the protective cylinder in a threaded manner, and the radio frequency connector joint is led out, a corresponding top sealing cover is arranged above the radio frequency connector joint to prevent dust and rainwater from entering in an unused state, a double-sealing ring is used for sealing a steel cylinder on a middle base of the sensor to ensure that the leakage problem of transformer oil is avoided, a bottom base flange is fastened on the reserved mounting flange surface of the transformer by bolts at the bottom of the sensor, flange plates of the bottom base can also be manufactured into flange bases with different diameters according to the requirements of the transformer, when the device is used, the device is directly connected with the interface of the radio frequency connector at the top end of the sensor, and the partial discharge state of the transformer can be checked.
Description
Technical Field
The utility model relates to the field of partial discharge detection of high-voltage electrical equipment, in particular to a UHF ultrahigh frequency partial discharge sensor.
Background
Partial discharges are relatively complex physical phenomena whose state must be assessed by means of various parameters and analyses for the damage he has to do to the insulation. The detection method of the transformer bushing current sensor mainly adopts a pulse current method in an electrical measurement method, wherein the pulse current method is used for detecting pulse current caused by partial discharge in a transformer bushing end screen grounding wire, a housing grounding wire, an iron core grounding wire, a neutral point grounding wire and a winding through detecting an impedance or a current sensor to obtain apparent discharge quantity.
The existing partial discharge detection mainly adopts an electrical measurement method and an ultrasonic method. Conventional electrical methods cannot be applied to already running equipment and only fixed discharge particles and aerosols can be detected and fault localization cannot be carried out. The ultrasonic method is complex in structure, can be operated by a person with long-term experience, needs common installation of a plurality of sensors for fault location, and is complex in structure and installation process.
SUMMERY OF THE UTILITY MODEL
Based on the problems in the prior art, the utility model aims to provide a UHF ultrahigh frequency partial discharge sensor, which solves the defects of the traditional detection means, and the ultrahigh frequency partial discharge measurement method is different from the traditional pulse flow method, and the collected signals are ultrahigh frequency electromagnetic waves generated by partial discharge. The sensor has flexible structure size, and is simple and convenient to mount without influencing the operation of the transformer or changing the structural design of the transformer. And the on-line monitoring of the partial discharge state of the transformer can be realized.
In order to achieve the purpose, the technical scheme adopted by the utility model is as follows:
the utility model provides a sensor is put in UHF superfrequency office, includes a protection section of thick bamboo, a steel cylinder, sensing mechanism, the sealed lid in top, base, and wherein sensing mechanism divide into sensing antenna, chip, radio frequency connector and connects, sensing antenna with the chip is connected, sensing antenna and radio frequency connector are connected, its characterized in that: the sensing antenna is fixed in the protective cylinder through a colloid, the chip is also fixed in the protective cylinder, the top of the protective cylinder is connected with the steel cylinder to form a sensing protective sleeve, the top of the protective cylinder is also provided with a guide ring for guiding the connection between the steel cylinder and the protective cylinder, the radio frequency connector joint is positioned at the topmost part of the steel cylinder, so that the sensor mechanism is positioned in the sensing protective sleeve, the base is sleeved outside the sensing protective sleeve, the base comprises a middle base and a bottom base, the middle base is sleeved at the middle position of the sensing protective sleeve, the bottom base is sleeved at the bottom position of the sensing protective sleeve, the bottom of the middle base and the top of the bottom base are connected through flanges, the sensing protective sleeve is arranged in the base, the front end of the middle base is provided with a double-channel sealing ring, and the front end of the double-channel sealing ring is provided with a top sealing cover, the top sealing cover covers the radio frequency connector joint.
Further, the protective cylinder can be made of various materials with the same shape and structure.
Preferably, the protective sleeve is made of polytetrafluoroethylene.
Preferably, the steel cylinder is made of stainless steel.
Further, a steel cylinder is sealed above the cylindrical body of the protective cylinder in a threaded mode above the protective cylinder, and the radio frequency connector joint is led out.
Furthermore, the bottom flange of the middle base is connected with the top flange of the bottom base through a flange.
Furthermore, the bottom flange plate of the bottom base is connected with the flange plate of the transformer through a flange.
Furthermore, the flange plate at the bottom end of the bottom base can be used for manufacturing flange bases with different drift diameters according to the requirement of the flange plate of the transformer.
The flange connection is a detachable joint which is used for fixing two pipelines, pipe fittings or equipment on a flange plate respectively, adding a flange pad between the two flange plates and finally tightening the two flange plates by bolts to tightly combine the two flange plates.
The utility model has the following beneficial effects:
the problems that the traditional partial discharge testing method is poor in anti-interference performance, complex in using steps, complex in sensor installation and incapable of monitoring the partial discharge state in real time are solved. The front end of the ultrahigh frequency chip is used for collecting ultrahigh frequency electromagnetic waves generated by partial discharge, and the bandwidth is monitored to be 300MHz-2000 MHz. Various patterns, phases, amplitudes and other characteristics of partial discharge can be reserved, so that the identification of partial discharge patterns can be carried out. And meanwhile, the partial discharge point is positioned by utilizing the time delay of the partial discharge signal reaching different sensors. The bottom flange plate is convenient to mount, and the bottom flange plate can be directly connected with a reserved radio frequency connector (N-Tyte interface) at the top to be used.
Drawings
Fig. 1 is a schematic diagram of a sensing protection cover of a UHF partial discharge sensor in an embodiment.
Fig. 2 is an exploded view of a UHF partial discharge sensor in an embodiment.
Fig. 3 is a bottom view of a UHF partial discharge sensor in an embodiment.
Fig. 4 is a front view of a UHF partial discharge sensor in an embodiment.
Fig. 5 is a left side view of a UHF partial discharge sensor in an embodiment.
Fig. 6 is a perspective view of a UHF partial discharge sensor in an embodiment.
The reference numbers in the figures are: 1-protective cylinder, 2-steel cylinder, 3-radio frequency connector joint, 4-top sealing cover, 5-base, 51-middle base, 52-bottom base, 6-internal guide ring, 7-double sealing ring and 8-sensing protective sleeve.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The transformer oil valve is a component directly connected with an oil way of the body and is positioned at the lower part of the transformer, the UHF sensor is arranged in an oil drain valve of a transformer oil tank, the oil drain valve at the bottom of the transformer oil tank is a gate valve or a ball valve with the diameter of DN 50-DN 150, otherwise, the UHF ultrahigh frequency partial discharge sensor cannot be arranged; if the drift diameter of the transformer oil valve is larger than DN80, the heavy gas protection is required to be closed temporarily during installation, so that the pressure in the tank body is prevented from being too large, referring to fig. 2-6, the drift diameter of the flange plate of the UHF ultrahigh frequency partial discharge sensor bottom base 51 can be manufactured according to the drift diameters of different flange plates of the oil discharge valve, the diagonal hole distance of the outer flange plate on the oil discharge valve at the bottom of the transformer and the distance between the flange plate and the oil tank body are measured, and only when the size of the flange plate is matched with that of the matched flange plate, namely the distance between the flange plate and the oil tank body is smaller than the length of the UHF ultrahigh frequency guide rod minus 200mm, the transformer oil valve can be used.
And (3) placing a matched sealing ring on the flange plate at the end part of the transformer oil valve, connecting the flange plate of the UHF ultrahigh frequency sensor with the flange plate at the end part of the transformer oil valve 52 through bolts, and screwing by using a spanner.
And (3) removing a flange cover plate on the transformer oil valve, observing the sealing end face of the valve, confirming the structure of the oil valve, and if the end face of the valve is provided with a rubber sealing gasket, directly using the valve, otherwise, using a white polytetrafluoroethylene sealing gasket which is provided in a matching way.
The assembled UHF ultrahigh frequency sensor bottom base 52 is completely butted with an oil valve end flange, the installation angle is adjusted to enable an oil valve switch to be located right above, then the remaining screw holes in the flange plate are fixedly connected through original bolts, the bolts are screwed down one by one according to diagonal positions, so that the sealing ring can be stressed uniformly and pressed tightly, and the oil valve is opened to enable the protection cylinder to be immersed in oil.
When the transformer is used, the UHF ultrahigh frequency sensor collects ultrahigh frequency electromagnetic wave signals, the top sealing cover is unscrewed at the same time, the top radio frequency connector interface can be connected or the radio frequency connector interface is connected to the collection device in the station through a coaxial cable, and the local discharge amount can be obtained by observing the display screen of the collection device.
The utility model can bring the following advantages:
the traditional pulse current method has low measurement frequency, narrow frequency band, low signal-to-noise ratio, easy interference influence and complicated installation steps, the UHF signal intensity depends on the pulse gradient, width and amplitude, the anti-interference capability is strong, and the method is not sensitive to the corona discharge interference in the air; the sensitivity to various discharge defects of the GIS is high; the signal propagation attenuation is reduced, and the detection range is large and can reach more than ten meters generally.
Claims (6)
1. The utility model provides a sensor is put in UHF superfrequency office, includes a protection section of thick bamboo (1), a steel section of thick bamboo (2), sensing mechanism, the sealed lid in top (4), base (5), wherein sensing mechanism divide into sensing antenna, chip, radio frequency connector joint (3), sensing antenna with the chip is connected, sensing antenna and radio frequency connector are connected, characterized in that: the sensing antenna is fixed in a protection barrel (1) through a colloid, the chip is also fixed in the protection barrel (1), the top of the protection barrel (1) is connected with a steel barrel (2) to form a sensing protection sleeve (8), the top of the protection barrel (1) is also provided with a guide ring (6) for guiding the connection between the steel barrel and the protection barrel, the radio frequency connector (3) is positioned at the top of the steel barrel (2) to enable a sensor mechanism to be positioned inside the sensing protection sleeve (8), the base (5) is sleeved outside the sensing protection sleeve (8), the base (5) comprises an intermediate base (51) and a bottom base (52), the intermediate base (51) is sleeved at the middle position of the sensing protection sleeve (8), the bottom base (52) is sleeved at the bottom position of the sensing protection sleeve (8), the bottom of the intermediate base (51) is connected with the top of the bottom base (52) through a flange, the sensing protection sleeve (8) is arranged inside the base (5), a double-sealing ring (7) is arranged at the top of the middle base (51), a top sealing cover (4) is arranged at the front end of the double-sealing ring, and the top sealing cover (4) covers the radio frequency connector joint (3).
2. The UHF ultrahigh frequency partial discharge sensor of claim 1, wherein: the protection cylinder (1) is made of polytetrafluoroethylene.
3. The UHF ultrahigh frequency partial discharge sensor of claim 1, wherein: the steel cylinder (2) is made of stainless steel.
4. The UHF ultrahigh frequency partial discharge sensor of claim 1, wherein: the protection cylinder (1) and the steel cylinder (2) are connected through threads.
5. The UHF ultrahigh frequency partial discharge sensor of claim 1, wherein: and the flange plate at the bottom end of the bottom base (52) is connected with the flange plate of the transformer by a flange.
6. The UHF ultrahigh frequency partial discharge sensor of claim 1, wherein: the drift diameter of the bottom flange plate of the bottom base (52) is set according to the drift diameter of the transformer flange plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120524116.0U CN215575463U (en) | 2021-03-12 | 2021-03-12 | UHF ultrahigh frequency partial discharge sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120524116.0U CN215575463U (en) | 2021-03-12 | 2021-03-12 | UHF ultrahigh frequency partial discharge sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215575463U true CN215575463U (en) | 2022-01-18 |
Family
ID=79854039
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120524116.0U Active CN215575463U (en) | 2021-03-12 | 2021-03-12 | UHF ultrahigh frequency partial discharge sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215575463U (en) |
-
2021
- 2021-03-12 CN CN202120524116.0U patent/CN215575463U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106841961A (en) | A kind of partial-discharge measuring device for cable GIS terminal pressure test | |
| CN102709037B (en) | A kind of transformator possessing built-in sensors | |
| CN202995018U (en) | Calibrating device of partial discharge detecting device | |
| CN111856224A (en) | Partial discharge multi-source fusion detection system and method for high-voltage switch cabinet | |
| CN102353628B (en) | Polarization testing probe and testing method for cathodic protection of underground steel pipelines | |
| CN105116304A (en) | Switch cabinet partial discharge detection system | |
| CN114019309A (en) | Cable defect positioning method based on frequency domain reflection technology | |
| CN108181597A (en) | A kind of GIS ultrahigh frequency local discharge sensor field test method | |
| CN106771819A (en) | A kind of Portable arrester resistive leakage current detection means | |
| CN101358689B (en) | Pipe detection device | |
| CN114047409A (en) | Power cable local defect online positioning method based on electromagnetic coupling injection | |
| CN215575463U (en) | UHF ultrahigh frequency partial discharge sensor | |
| CN206696387U (en) | External extra-high video sensor for GIS partial discharge detection | |
| CN206725708U (en) | A kind of partial-discharge measuring device for cable GIS terminal pressure test | |
| CN205484666U (en) | Sensor is put in built -in ultrasonic wave office | |
| CN201594126U (en) | Microstrip antenna sensing device for monitoring ultrahigh frequency local discharging of transformer on line | |
| CN211402430U (en) | 220KV current transformer bushing end screen signal pickup device | |
| CN202678075U (en) | Transformer equipped with built-in sensors | |
| CN202649256U (en) | Anti-interference transformer winding deformation test lead wire and test device composed thereof | |
| CN102866329A (en) | GIS (Geographic Information System) local discharge monitoring device and method utilizing voltage sharing springs as detectors | |
| CN206020590U (en) | A kind of switch cabinet partial discharge on-line monitoring sensor | |
| CN213715368U (en) | External ultrahigh frequency sensor for detecting partial discharge of power equipment | |
| CN111175620B (en) | Electrified detection system of oil-immersed transformer of nuclear power station | |
| CN112034270A (en) | Detection apparatus for cable intermediate head power frequency electric field intensity | |
| CN207623286U (en) | One kind being used for the in-service energy-stored spring ultrasonic guided wave detection device of narrow space |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |