CN108710005B - Dielectric loss partial discharge sensor structure and capacitive high-voltage electrical equipment detection mechanism - Google Patents
Dielectric loss partial discharge sensor structure and capacitive high-voltage electrical equipment detection mechanism Download PDFInfo
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- CN108710005B CN108710005B CN201810601087.6A CN201810601087A CN108710005B CN 108710005 B CN108710005 B CN 108710005B CN 201810601087 A CN201810601087 A CN 201810601087A CN 108710005 B CN108710005 B CN 108710005B
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- dielectric loss
- discharge sensor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2688—Measuring quality factor or dielectric loss, e.g. loss angle, or power factor
- G01R27/2694—Measuring dielectric loss, e.g. loss angle, loss factor or power factor
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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
Abstract
The invention relates to a dielectric loss partial discharge sensor structure and a capacitive high-voltage electrical equipment detection mechanism. This sensor structure is put in loss office that mesons includes base construction, connect in structural shell structure of base, mutual independence locates sensing module is put in loss sensing module, high frequency office in the shell structure, sensing module is put in the superfrequency office, and wears to locate the last conductor pole of shell structure, just the conductor pole passes the sensing module is put in the superfrequency office sensing module is put in the superfrequency office. The technical scheme provided by the invention can be used for installing and detecting the test equipment on the premise of not stopping power supply, and can also ensure the reliability of the equipment.
Description
Technical Field
The invention relates to the technical field of power supply equipment test detection, in particular to a dielectric loss partial discharge sensor structure and a capacitive high-voltage electrical equipment detection mechanism.
Background
In order to carry out uninterrupted test on the running capacitive high-voltage electrical equipment, a capacitive high-voltage electrical equipment dielectric loss electrification test technology and a high-frequency capacitive high-voltage electrical equipment electrification partial discharge detection technology which take an in-phase comparison method as a principle are popularized in a power grid test point and obtain certain effect. However, these testing techniques cannot be widely popularized because the above-mentioned devices need to be accessed to a detection device such as a dielectric loss tester, a partial discharge detector, or an ultra-high frequency partial discharge detector when performing a live test, but power failure operation is required when installing these detection devices, which causes inconvenience in installation and also causes a certain economic loss. In addition, terminal box installation or sensor access on existing equipment can affect equipment reliability and can create potential safety hazards.
Disclosure of Invention
Based on the above, in order to solve the above problems, the invention provides a dielectric loss partial discharge sensor structure and a capacitive high-voltage electrical equipment detection mechanism, which can be used for installing and detecting test equipment on the premise of no power failure and can also ensure the reliability of the equipment.
The technical scheme is as follows:
a dielectric loss partial discharge sensor structure comprises a base structure, a shell structure connected to the base structure, a dielectric loss sensing module, a high-frequency partial discharge sensing module, an ultrahigh-frequency partial discharge sensing module and a conductor rod, wherein the dielectric loss sensing module, the high-frequency partial discharge sensing module and the ultrahigh-frequency partial discharge sensing module are mutually independently arranged in the shell structure;
the shell structure comprises a metal shell arranged on the base structure and a closed cavity formed in the metal shell;
the dielectric loss sensing module comprises a dielectric loss sensor main body arranged in the closed cavity and a dielectric loss sensor joint which is connected with the dielectric loss sensor main body and protrudes out of the metal shell;
the high-frequency partial discharge sensing module comprises a high-frequency partial discharge sensor main body arranged in the closed cavity and a high-frequency partial discharge sensor joint which is connected with the high-frequency partial discharge sensor main body and protrudes out of the metal shell;
the ultrahigh frequency partial discharge sensing module comprises an ultrahigh frequency partial discharge sensor main body arranged in the closed cavity and an ultrahigh frequency partial discharge sensor joint which is connected with the ultrahigh frequency partial discharge sensor main body and protrudes out of the metal shell; the dielectric loss sensor main body, the high-frequency partial discharge sensor main body and the ultrahigh-frequency partial discharge sensor main body are all arranged independently, and the conductor rod penetrates through the dielectric loss sensor main body, the high-frequency partial discharge sensor main body and the ultrahigh-frequency partial discharge sensor main body respectively, and one end of the conductor rod protrudes out of the shell structure.
The following further technical scheme is explained:
further, the sensor main part is decreased to the mesosphere, the sensor main part is put in the high frequency office, the sensor main part is put in the superfrequency office in proper order the cluster locate in the closed cavity, just the sensor joint is decreased to the mesosphere the sensor joint is put in the high frequency office the sensor joint is put in the superfrequency office locate in proper order metal casing periphery side.
Further, the dielectric loss sensor joint is set as a six-core standard joint, and the high-frequency partial discharge sensor joint and the ultrahigh-frequency partial discharge sensor joint are both set as TNC standard joints.
Further, shell structure still including connect the base structure with metal casing's connecting piece, just the connecting piece passes and is fixed the loss sensor main part is situated between, the sensor main part is put in the high frequency office and the sensor main part is put in the superfrequency office.
Furthermore, the shell structure further comprises a first insulating sleeve and a second insulating sleeve which are respectively arranged at two ends of the metal shell, one end of the conductor rod penetrates through the first insulating sleeve, and the other end of the conductor rod penetrates through the second insulating sleeve.
Furthermore, the conductor pole is including outstanding the conductor head outside the metal casing, the sensor structure is put in the loss office still including dismantling connect in the ground cap on the conductor head, just ground cap and metal casing contact cover the conductor head.
In addition, the invention also provides a capacitive high-voltage electrical equipment detection mechanism which comprises the dielectric loss partial discharge sensor structure and a tail screen device detachably connected with the dielectric loss partial discharge sensor structure.
Furthermore, the end screen device comprises an end screen base, an end screen guide rod arranged on the end screen base and an end screen lead connected to one end of the end screen guide rod, and the other end of the end screen guide rod is detachably connected with the conductor rod.
Further, the base structure include with the base main part that metal casing connects, and set up in base through-hole in the base main part, the conductor pole still include with the end screen connector that the base through-hole corresponds, end screen guide arm one end is passed the base through-hole and with the connection can be dismantled to the end screen connector.
Furthermore, the end screen device further comprises an end screen connecting sleeve which is arranged on the end screen base and surrounds the end screen guide rod, and the end screen connecting sleeve is detachably connected to the base main body.
The invention has the following beneficial effects: the capacitive high-voltage electrical equipment is tested in dielectric loss and partial discharge without power failure, the capacitive high-voltage electrical equipment is unified with a live test mode in delivery, handover prevention and power failure tests, the end screen is reliably grounded, and the sensor is safely and conveniently removed and restored to be the traditional capacitive high-voltage electrical equipment structure when not needed.
Drawings
Fig. 1 is a schematic front view of a dielectric loss partial discharge sensor structure according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional structural diagram of a dielectric loss partial discharge sensor structure according to an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of the end screen assembly (when the grounding cap is installed) in an embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view of the end screen assembly (with ground cap removed) in an embodiment of the present invention;
FIG. 5 is a schematic cross-sectional view of the capacitive high voltage electrical equipment detection mechanism (when the grounding cap is installed) in an embodiment of the present invention;
fig. 6 is a schematic cross-sectional view of the capacitive high-voltage apparatus detection mechanism (with the grounding cap removed) according to the embodiment of the invention.
Description of reference numerals:
10-wire clamp, 100-dielectric loss partial discharge sensor structure, 110-base structure, 120-metal housing, 122-connector, 124-first insulating sleeve, 126-second insulating sleeve, 130-grounding cap, 140-dielectric loss sensing module, 142-dielectric loss sensor body, 144-dielectric loss sensor joint, 150-high frequency partial discharge sensing module, 152-high frequency partial discharge sensor body, 154-high frequency partial discharge sensor joint, 160-ultrahigh frequency partial discharge sensing module, 162-ultrahigh frequency partial discharge sensor body, 164-ultrahigh frequency partial discharge sensor joint, 170-conductor rod, 172-conductor head, 174-end screen connector, 200-end screen device, 210-end screen base, 220-end screen connecting sleeve, 222-connecting bolt, 230-end screen guide rod, 240-end screen lead wire, 250-screw and 260-end screen insulating sleeve.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. The embodiments described below with reference to the drawings are illustrative only and are not to be construed as limiting the invention.
As shown in fig. 1 to fig. 2, the present invention provides a dielectric loss partial discharge sensor structure, which includes a base structure 110, a housing structure connected to the base structure 110, a dielectric loss sensing module 140, a high frequency partial discharge sensing module 150, an ultrahigh frequency partial discharge sensing module 160, and a conductor rod 170 penetrating the housing structure, wherein the conductor rod 170 penetrates the dielectric loss sensing module 140, the high frequency partial discharge sensing module 150, and the ultrahigh frequency partial discharge sensing module 160. The dielectric loss sensing module 140, the high-frequency partial discharge sensing module 150, and the ultrahigh-frequency partial discharge sensing module 160 are integrated into a whole through a shell structure, so as to form a combined intelligent sensor. Moreover, the dielectric loss sensing module 140, the high-frequency partial discharge sensing module 150, and the ultrahigh-frequency partial discharge sensing module 160 are three independent modules, and any combination of the three functional modules can be used to form products with different functions if necessary. By utilizing the combined intelligent sensor, dielectric loss test and partial discharge test can be respectively carried out, or dielectric loss test and partial discharge test can be simultaneously carried out.
Specifically, the housing structure includes a metal shell 120 disposed on the base structure 110, and a closed cavity formed in the metal shell 120. The dielectric loss sensing module 140 includes a dielectric loss sensor main body 142 disposed in the closed cavity, and a dielectric loss sensor connector 144 connected to the dielectric loss sensor main body 142 and protruding out of the metal housing 120, wherein the conductor rod 170 passes through the dielectric loss sensor main body 142. In the measurement process, one end of the conductor bar 170 is connected to the measured object, the dielectric loss detection can be realized by using the dielectric loss sensor main body 142 penetrating through the conductor bar 170, and the dielectric loss data measured by the dielectric loss sensor main body 142 can be output by using the dielectric loss sensor joint 144 protruding out of the metal shell 120. In addition, the high frequency partial discharge sensing module 150 includes a high frequency partial discharge sensor main body 152 disposed in the closed cavity, and a high frequency partial discharge sensor connector 154 connected to the high frequency partial discharge sensor main body 152 and protruding out of the metal shell 120, and the conductor rod 170 penetrates through the high frequency partial discharge sensor main body 152. Similarly, in the measurement process, one end of the conductor bar 170 is connected to the measured object, the high-frequency partial discharge detection can be realized by using the high-frequency partial discharge sensor main body 152 penetrating through the conductor bar 170, and the high-frequency partial discharge data measured by the high-frequency partial discharge sensor main body 152 can be output by using the high-frequency partial discharge sensor connector 154 protruding out of the metal shell 120. In addition, the uhf partial discharge sensor module 160 includes an uhf partial discharge sensor body 162 disposed in the closed cavity, and an uhf partial discharge sensor connector 164 connected to the uhf partial discharge sensor body 162 and protruding outside the metal shell 120, and the conductor bar 170 passes through the uhf partial discharge sensor body 162. Similarly, in the measurement process, one end of the conductor bar 170 is connected to the measured object, the vhf partial discharge detection can be realized by the vhf partial discharge sensor main body 162 penetrating through the conductor bar 170, and the vhf partial discharge data measured by the vhf partial discharge sensor main body 162 can be output by the vhf partial discharge sensor connector 164 protruding out of the metal shell 120.
The dielectric loss sensor body 142, the high-frequency partial discharge sensor body 152, and the ultrahigh-frequency partial discharge sensor body 162 are all independently disposed, and all of them are disposed in the closed cavity of the metal housing 120. The conductor rod 170 passes through the dielectric loss sensor body 142, the high frequency partial discharge sensor body 152, and the ultrahigh frequency partial discharge sensor body 162, and has one end protruding out of the metal case 120 of the housing structure. Through will be situated between and decrease sensor main part 142, high frequency partial discharge sensor main part 152, sensor main part 162 is put in the superfrequency office and is set up each other independently for three sensor module is independent each other, can become different products according to user's demand arbitrary combination function module, even if also can be in the use in the convenient arbitrary certain module of dismantling or increase some modules of necessary in order to satisfy user's different needs (if only need be situated between and decrease or partial discharge test function, or still be situated between and decrease and partial discharge test function all needs). In addition, by providing the metal casing 120 with a complete seal, physical protection and shielding of external interference signals can be achieved for the dielectric loss sensor main body 142, the high-frequency partial discharge sensor main body 152 and the ultrahigh-frequency partial discharge sensor main body 162 which are arranged in the closed cavity of the metal casing 120, so that measurement of each sensor module is more accurate and reliable, and the sensor module is not easily damaged by external acting force.
Further, in some embodiments, the dielectric loss sensor body 142, the high frequency partial discharge sensor body 152, and the ultrahigh frequency partial discharge sensor body 162 may be sequentially disposed in series in the closed cavity of the metal housing 120. That is, the dielectric loss sensor main body 142, the high-frequency partial discharge sensor main body 152, and the ultrahigh-frequency partial discharge sensor main body 162 may be sequentially disposed in the closed cavity end to end, and a conductor rod may be correspondingly disposed to serially connect all the sensor modules, that is, three sensor modules are sequentially and correspondingly serially connected to a conductor rod 170 end to end, and are sleeved in the closed cavity of the metal housing 120.
In addition, in other embodiments, the dielectric loss sensor main body 142, the high-frequency partial discharge sensor main body 152, and the ultrahigh-frequency partial discharge sensor main body 162 may be arranged in the closed cavity side by side, three conductor rods may be correspondingly arranged to correspond to the three sensor modules one by one, and two ends of the three conductor rods may be respectively provided with a guide rod for connection, so that two ends of the conductor rods are conveniently inserted into two ends of the metal housing 120. The three sensor modules can be arranged in parallel in the metal casing 120, and then the three branch conductor rods are respectively penetrated, and the two ends of the three branch conductor rods are respectively converged together and penetrated at the two ends of the metal casing 120. In addition, the two embodiments may be combined, that is, the dielectric loss sensor main body 142, the high frequency partial discharge sensor main body 152, and the ultrahigh frequency partial discharge sensor main body 162 are arranged in series and then arranged in parallel with another sensor module.
The dielectric loss sensor terminal 144, the high-frequency partial discharge sensor terminal 154, and the ultrahigh-frequency partial discharge sensor terminal 164 may be provided in this order on the outer circumferential side of the metal case 120. Moreover, the corresponding dielectric loss sensor connector 144, the high frequency partial discharge sensor connector 154, and the ultrahigh frequency partial discharge sensor connector 164 may protrude out of the periphery of the metal casing 120, and these three sensor connectors may be arranged in a row, or may be arranged in a staggered manner, so as to facilitate communication connection with the testing and detecting device. Further, the dielectric loss sensor connector 144 can be a six-core standard connector, and both the high frequency partial discharge sensor connector 154 and the ultrahigh frequency partial discharge sensor connector 164 can be a TNC (Total digital Control) standard connector. Therefore, the dielectric loss sensing module 140 of the combined intelligent sensor communicates with the outside through a six-core standard connector, and the high-frequency partial discharge sensing module 150 and the ultrahigh-frequency partial discharge sensing module 160 communicate with the outside through a TNC standard connector.
In addition, the housing structure further includes a connecting member 122 connecting the base structure 110 and the metal shell 120, and a connecting member 222 passes through and fixes the dielectric loss sensor main body 142, the high frequency partial discharge sensor main body 152 and the ultrahigh frequency partial discharge sensor main body 162. That is, the dielectric loss sensor main body 142, the high-frequency partial discharge sensor main body 152 and the ultrahigh-frequency partial discharge sensor main body 162 are fixed in the closed cavity of the metal shell 120 through the connecting member 122, so that the three sensor modules, i.e., the dielectric loss sensor module 140, the high-frequency partial discharge sensor module 150 and the ultrahigh-frequency partial discharge sensor module 160, are stably and reliably connected to the metal shell 120, and the stability and reliability of the whole component are improved. Specifically, the connecting member 122 may be configured as a locking screw, or may be configured as a connecting structure such as a connecting bolt. Furthermore, in the present embodiment, three sensor modules, the metal housing 120 and the base structure 110 can be connected into a whole by four locking screws.
In addition, the metal housing 122 may be a hollow cylinder (such as a cylinder, a square column, etc.), and the closed cavity may also be a cylindrical cavity, so as to accommodate the sensor module. In addition, the housing structure further includes a first insulating sleeve 124 and a second insulating sleeve 126 respectively disposed at two ends of the cylindrical metal shell 120, and one end of the conductor bar 170 is inserted into the first insulating sleeve 124, and the other end is inserted into the second insulating sleeve 126. By providing the upper first and second insulating sleeves 124, 126, physical isolation of the conductor bar 170 from the various sensor functional modules is achieved. Further, an insulating case may be provided in each of the dielectric loss sensor main body 142, the high-frequency partial discharge sensor main body 152, and the ultrahigh-frequency partial discharge sensor main body 162, and the conductor bar 170 may be inserted into the insulating case, thereby further isolating the conductor bar 170 from each sensor module.
In addition, as shown in fig. 3 to fig. 6, the present invention further provides a capacitive high-voltage electrical apparatus detecting mechanism, which includes the dielectric loss partial discharge sensor structure 100 as described above, and a end-screen device 200 detachably connected to the dielectric loss partial discharge sensor structure 100. Through the dielectric loss and partial discharge sensor structure 100, a capacitive high-voltage electrical appliance device connected with the end screen device 200 can be subjected to uninterrupted dielectric loss and partial discharge tests. Furthermore, the conductor bar 170 of the dielectric loss partial discharge sensor structure 100 includes a conductor head 172 protruding out of the metal housing 120, and a tail connector 174 detachably connected to the tail device 200. Furthermore, the dielectric loss partial discharge sensor structure 100 further includes a grounding cap 130 detachably connected to the conductor head 172, and the grounding cap 130 contacts the metal shell 120 and covers the conductor head 172. When the end screen device 300 and the capacitive high-voltage electrical equipment connected with the end screen device 300 need to be tested, the grounding cap 130 on the conductor head 172 can be detached and connected with the wire clamp 10 of the testing equipment, and then the delivery test, the handover prevention test or the power failure test in operation of the capacitive high-voltage electrical equipment can be carried out. Furthermore, when testing of the end shield 200 and the capacitive high voltage electrical equipment connected thereto is not required, the grounding cap 130 may be maintained in a state of being mounted to the conductor head 172 and contacting the metal shell 120, so that the end shield 200 is maintained in a grounded state. That is, the dielectric loss partial discharge sensor structure 100 is connected to the end screen device 200 of the capacitive high-voltage electrical equipment, and then the grounding cap 130 connected to the conductor bar 170 is pressed against the metal casing 120 to realize the reliable grounding of the end screen of the capacitive high-voltage electrical equipment.
Specifically, as shown in fig. 3 to 4, the end-screen apparatus 200 may include an end-screen base 210, an end-screen guide 230 disposed on the end-screen base 210, and an end-screen lead 240 connected to one end of the end-screen guide 230 (one end of the end-screen lead 240 may be connected to the capacitive high-voltage electrical equipment, and the other end of the end-screen lead 240 may be connected to the end-screen guide 230 by a screw 250), and the other end of the end-screen guide 230 may be detachably connected to the conductor bar 170. That is, one end of the end screen guide rod 230 of the end screen device 200 is connected to the end screen connector 174 of the conductor rod 170 of the dielectric loss partial discharge sensor structure 100, so that the end screen device 200 is connected to the dielectric loss partial discharge sensor structure 100, and the end screen device 200 and the capacitive high-voltage electrical equipment can be subjected to live test (including delivery test, handover prevention test or power failure test during operation, and dielectric loss and partial discharge test) through the conductor rod 170. The dielectric loss and partial discharge sensor structure 100 is installed on capacitive high-voltage electrical equipment, dielectric loss and partial discharge signals of the capacitive high-voltage electrical equipment can be acquired by contacting a conductor rod 170 in the dielectric loss and partial discharge sensor structure 100 with a tail screen guide rod 230 connected with the capacitive high-voltage electrical equipment, and a user can insert a signal input line of a partial discharge and dielectric loss tester into a standard interface of a corresponding sensor module of the dielectric loss and partial discharge sensor structure 100 so as to realize dielectric loss and (or) partial discharge test on the equipment. Furthermore, as shown in fig. 6, when the capacitive high-voltage electrical equipment is subjected to a factory test, a handover prevention test or an in-operation power failure test, the capacitive high-voltage electrical equipment can be tested through the conductor bar 170 and the end screen guide rod 230 by only removing the grounding cap 130 mounted on the conductor bar 170 and clamping the wire clamp 10 of the tester on the conductor bar 170, and the entire dielectric loss partial discharge sensor structure 100 does not need to be removed. In addition, in the present embodiment, both the conductor bar 170 and the end screen guide 230 may be provided as copper bars.
Moreover, the end screen device 200 further includes an end screen connecting sleeve 220 disposed on the end screen base 210 and surrounding the end screen guide rod 230, wherein the end screen connecting sleeve 220 is detachably connected to the base structure 110 of the dielectric loss partial discharge sensor structure. By connecting the end screen connecting sleeve 220 with the base structure 110, the metal shell 120 can be connected with the end screen base 210 through the end screen connecting sleeve 220, so that the grounding cap 130 (the grounding cap 130 is connected with the end screen guide rod 230 through the conductor rod 170) contacting with the metal shell 120 is grounded through the end screen base 210 (generally, the end screen base 210 is grounded), and reliable grounding of the end screen device 200 is ensured. Furthermore, the end screen connecting sleeve 220 can be fixedly connected with the end screen base 210 through a connecting bolt 222. In addition, the above-mentioned end screen device 200 may further include an end screen insulating sleeve 260 disposed in the middle of the end screen connecting sleeve 220, and the end screen insulating sleeve 260 may be fixed on the end screen connecting sleeve 220 and the end screen base 210 by a fixing member. Moreover, the end screen guide 230 is inserted into the end screen insulating sleeve 260, and one end of the end screen guide 230 protrudes out of the end screen insulating sleeve 260 and is detachably connected with the end screen connector 174 of the conductor bar 170. In this embodiment, the stub connector 174 of the conductor bar 170 may be threadably coupled to the stub guide 230. In addition, the above-mentioned end screen device 200 may further include a base flange connected to the bottom of the end screen base 210, through which the end screen device 200 may be fixed to the capacitive high-voltage electrical equipment.
In addition, the base structure 110 of the dielectric loss partial discharge sensor structure 100 includes a base main body connected to the metal housing 120, and a base through hole opened on the base main body, and the end screen connector 174 of the conductor bar 170 corresponds to the base through hole, and one end of the end screen guide rod 230 of the end screen device 200 passes through the base through hole and is detachably connected to the end screen connector 174, so as to connect the end screen device 200 to the dielectric loss partial discharge sensor structure 100. Also, the above-mentioned end screen connecting sleeve 220 may be connected to the inside or outside of the base body. In this embodiment, the end shield connecting sleeve 220 may be screwed to the base through hole of the base main body, or screwed to the outer periphery of the base main body, so that the metal shell 120 is connected to the end shield base 210 through the base structure 110 and the end shield connecting sleeve 220 and grounded, and the end shield guide rod 230 is also connected to the conductor rod 170 stably and reliably. In addition, as shown in fig. 3, when the dielectric loss partial discharge sensor structure 100 is not used, the dielectric loss partial discharge sensor structure can be detached from the end screen device 200, and then the grounding cap 130 is mounted on the end screen guide rod 230, so that the grounding cap 130 is kept in contact with the end screen connecting sleeve 220, and the end screen device 200 is kept in a grounding state. When it is desired to directly test the end screen assembly 200 and the capacitive high voltage electrical device, the grounding cap 130 can be removed from the end screen guide and the clamp 10 of the test device can be directly clamped to the end screen guide 230, as shown in fig. 4.
In order to clearly explain how the capacitive high-voltage electrical equipment is grounded and dielectric loss and partial discharge tests are carried out, a current transformer is taken as an example for explanation. When a current transformer serving as capacitive high-voltage electrical equipment is directly connected with the end screen device 200, the bottom end of an end screen guide rod 230 of the end screen device 200 is provided with internal threads, the top end of the end screen guide rod is provided with external threads, and an end screen lead 240 connected with the current transformer is connected and fixed at the bottom end of the end screen guide rod 230 by a screw 250 to obtain an end screen current signal of the current transformer. As shown in fig. 4, when performing dielectric loss and partial discharge tests on the current transformer, and when performing a transformer delivery test, a handover test, and a power failure inspection test on the current transformer, it is only necessary to clamp the input line of the tester at the top end of the end screen guide rod 230 through one wire clamp 10. Because the current transformer needs to be reliably grounded at any time in the operation process, if the end screen device 200 needs to be reliably grounded, the end screen connecting sleeve 220 can be designed and fixed on the grounded end screen base 210 through the connecting bolt 222, and the end screen connecting sleeve 220 and the end screen guide rod 230 are screwed together through the top threads of the grounding cap 130, so that the end screen device 200 can be reliably grounded (as shown in fig. 3). Therefore, unless testing of the current transformer by the end screen assembly 200 is required, the grounding cap 130 is always installed on the end screen adapter sleeve 220 and the end screen guide 230, the grounding cap 130 is loosened during testing and is installed after testing.
When the current transformer is connected to the dielectric loss partial discharge sensor structure 100 through the end screen device 200, the end screen device grounding mode is adopted, so that the conductor rod 170 of the dielectric loss partial discharge sensor structure passes through the whole sensor structure and extends to be exposed outside the top of the sensor structure. As shown in fig. 5, the bottom end (i.e., the end screen connector 174) of the conductor bar 170 adopts an internal thread structure, the top end (i.e., the conductor head 172) adopts an external thread structure, the bottom end screen connector 174 is screwed with the end screen guide rod 230 to obtain an end screen current signal of the current transformer, and the top conductor head 172 is screwed with the grounding cap 130 and is pressed tightly on the metal shell 120 to realize reliable grounding of the end screen device 200. When testing the live dielectric loss and partial discharge, only the lead wires corresponding to the external tester are respectively connected to the signal output connectors (namely the dielectric loss sensor connector 144, the high-frequency partial discharge sensor connector 154 and the ultrahigh-frequency partial discharge sensor connector 164) of the dielectric loss sensor module 140, the high-frequency partial discharge sensor module 150 and the ultrahigh-frequency partial discharge sensor module 160 of the dielectric loss partial discharge sensor structure; as shown in fig. 6, when performing the power outage dielectric loss and partial discharge test, and when performing the transformer delivery test, the handover test, and the power outage maintenance test on the current transformer, the grounding cap 130 mounted on the conductor head 172 of the conductor bar 170 is loosened, and the external tester input line is clamped on the conductor head 172 of the conductor bar 170 through one wire clamp 10. After testing, the clip 10 is removed and the grounding cap 130 is reinstalled on the conductor head 172. Therefore, unless a power failure test is performed, the grounding cap 130 mounted on the conductor head 172 always contacts the metal shell 120 of the dielectric loss partial discharge sensor structure, so that the end screen device 200 is in a grounding state at all times when the live operation is performed.
According to the technical scheme, the dielectric loss partial discharge sensor structure provided by the invention is a disassembly-free dielectric loss partial discharge combined intelligent sensor matched with on-line monitoring (or live test) capacitive high-voltage electrical equipment for use, the sensor structure is formed by combining three or any independent functional modules according to the user requirements, and during live test, the process can be carried out only by inputting a tester signal to a corresponding sensor connector; when the power failure test is carried out in factory test, handover prevention test and operation, only the grounding cap screwed on the conductor rod needs to be unscrewed, and a signal wire of the tester is clamped on the conductor rod, so that the whole sensor does not need to be disassembled. Moreover, in the long-term operation process of the capacitive high-voltage electrical equipment, a user can conveniently and quickly replace the whole sensor or increase or decrease any sensor module by unscrewing the locking screw. In addition, a user can also directly unscrew the dielectric loss partial discharge sensor structure from the end screen device, and a grounding cap is arranged on an end screen guide rod of the original end screen device, so that the equipment can be restored into traditional capacitive high-voltage electrical equipment. The dielectric loss and partial discharge sensor structure provided by the invention can realize the non-outage dielectric loss and partial discharge test of capacitive high-voltage electric equipment, realize the unification of delivery, handover prevention and power failure test and live test modes of the capacitive high-voltage electric equipment, realize the reliable grounding of the end screen, and realize the safe and convenient removal and restoration of the sensor into the traditional capacitive high-voltage electric equipment structure when the sensor is not needed.
Further, it is to be understood that, in the above-described embodiments, the positional relationships indicated by the terms "lower", "upper", "front", "rear", "left", "right", "inner", "outer", "top", "bottom", "one side", "the other side", "one end", "the other end", and the like are based on the positional relationships shown in the drawings; the terms "first," "second," and the like are used herein to distinguish one structural element from another. These terms are merely for convenience in describing the present invention and for simplicity in description, and are not to be construed as limiting the present invention.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A dielectric loss partial discharge sensor structure is characterized by comprising a base structure, a shell structure connected to the base structure, a dielectric loss sensing module, a high-frequency partial discharge sensing module, an ultrahigh-frequency partial discharge sensing module and a conductor rod penetrating through the shell structure, wherein the dielectric loss sensing module, the high-frequency partial discharge sensing module and the ultrahigh-frequency partial discharge sensing module are mutually independently arranged in the shell structure;
the shell structure comprises a metal shell arranged on the base structure and a closed cavity formed in the metal shell;
the dielectric loss sensing module comprises a dielectric loss sensor main body arranged in the closed cavity and a dielectric loss sensor joint which is connected with the dielectric loss sensor main body and protrudes out of the metal shell;
the high-frequency partial discharge sensing module comprises a high-frequency partial discharge sensor main body arranged in the closed cavity and a high-frequency partial discharge sensor joint which is connected with the high-frequency partial discharge sensor main body and protrudes out of the metal shell;
the ultrahigh frequency partial discharge sensing module comprises an ultrahigh frequency partial discharge sensor main body arranged in the closed cavity and an ultrahigh frequency partial discharge sensor joint which is connected with the ultrahigh frequency partial discharge sensor main body and protrudes out of the metal shell; the dielectric loss sensor main body, the high-frequency partial discharge sensor main body and the ultrahigh-frequency partial discharge sensor main body are all arranged independently, and the conductor rod respectively penetrates through the dielectric loss sensor main body, the high-frequency partial discharge sensor main body and the ultrahigh-frequency partial discharge sensor main body, and one end of the conductor rod protrudes out of the shell structure;
wherein, shell structure is still including connecting the base structure with metal casing's connecting piece, just the connecting piece passes and is fixed the loss sensor main part is situated between the dielectric loss sensor main part the high frequency office puts the sensor main part and the sensor main part is put in the superfrequency office, the connecting piece is locking screw.
2. The dielectric loss sensor structure according to claim 1, wherein said dielectric loss sensor body, said high frequency partial discharge sensor body, and said ultrahigh frequency partial discharge sensor body are sequentially disposed in series in said closed cavity, and said dielectric loss sensor connector, said high frequency partial discharge sensor connector, and said ultrahigh frequency partial discharge sensor connector are sequentially disposed on an outer peripheral side of said metal case.
3. The dielectric loss partial discharge sensor structure according to claim 1, wherein the dielectric loss sensor connector is configured as a six-core standard connector, and the high frequency partial discharge sensor connector and the uhf partial discharge sensor connector are both configured as TNC standard connectors.
4. The dielectric loss partial discharge sensor structure according to claim 2, wherein the dielectric loss sensor connector is configured as a six-core standard connector, and the high frequency partial discharge sensor connector and the uhf partial discharge sensor connector are both configured as TNC standard connectors.
5. The dielectric loss partial discharge sensor structure according to claim 1 or 2, wherein the housing structure further comprises a first insulating sleeve and a second insulating sleeve respectively disposed at two ends of the metal shell, one end of the conductor rod is disposed through the first insulating sleeve, and the other end of the conductor rod is disposed through the second insulating sleeve.
6. The dielectric loss sensor structure of claim 1, wherein the conductor bar comprises a conductor head protruding from the metal housing, and further comprising a grounding cap detachably connected to the conductor head, wherein the grounding cap contacts the metal housing and covers the conductor head.
7. A capacitive high-voltage electrical equipment detection mechanism, comprising a dielectric loss partial discharge sensor structure according to any one of claims 1 to 6, and a tail screen device detachably connected to the dielectric loss partial discharge sensor structure.
8. The capacitive high voltage electrical equipment detection mechanism of claim 7, wherein the end screen device comprises an end screen base, an end screen guide rod arranged on the end screen base, and an end screen lead connected to one end of the end screen guide rod, and the other end of the end screen guide rod is detachably connected to the conductor rod.
9. The capacitive high-voltage electrical equipment detection mechanism according to claim 8, wherein the base structure comprises a base main body connected with the metal shell, and a base through hole formed in the base main body, the conductor bar further comprises a end screen connector corresponding to the base through hole, and one end of the end screen guide rod penetrates through the base through hole and is detachably connected with the end screen connector.
10. The capacitive high voltage electrical equipment detection mechanism of claim 9, wherein the end screen device further comprises an end screen connection sleeve disposed on the end screen base and surrounding the end screen guide rod, the end screen connection sleeve being detachably connected to the base body.
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| CN101710655B (en) * | 2009-12-02 | 2012-02-08 | 中国广东核电集团有限公司 | On-line monitoring grounding wire lead-out structure of high-voltage sleeve |
| CN204314342U (en) * | 2014-12-29 | 2015-05-06 | 国网四川省电力公司成都供电公司 | Transformer online monitoring end shield of high-voltage bushing adapter |
| CN105137152A (en) * | 2015-08-21 | 2015-12-09 | 华北电力大学 | Ground lead current signal monitoring sensor for end screen of transformer bushing |
| CN106199482A (en) * | 2016-08-31 | 2016-12-07 | 湖南电力电瓷电器有限公司 | A kind of on-line monitoring Intelligent current transformer |
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| CN107478969A (en) * | 2017-08-08 | 2017-12-15 | 江苏智达高压电气有限公司 | A kind of gas insulated bushing end shield structure |
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