CN114113949A - Device for measuring partial discharge - Google Patents
Device for measuring partial discharge Download PDFInfo
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- CN114113949A CN114113949A CN202111469779.8A CN202111469779A CN114113949A CN 114113949 A CN114113949 A CN 114113949A CN 202111469779 A CN202111469779 A CN 202111469779A CN 114113949 A CN114113949 A CN 114113949A
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- measuring
- cable
- plug
- induction
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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 application discloses measure partial discharge's device includes: end cap, induction system and measuring device, wherein, the end cap comprises insulating material, end cap one side is equipped with the recess, the end cap opposite side is equipped with induction system, the end cap is isolated the recess with induction system, stud pass through the recess with the end cap is connected, stud is connected with the cable electricity that awaits measuring, induction system with measuring device electricity is connected, and when the cable that awaits measuring discharges, induction system responds stud's electric potential produces induced voltage, measuring device is through measuring induction system's induced voltage obtains the discharge voltage of the cable that awaits measuring. This application is through setting up induction system in end cap one side, and the purpose of measuring cable partial discharge has been realized to the discharge voltage of response cable that awaits measuring.
Description
Technical Field
The application relates to the field of voltage measurement, in particular to a device for measuring partial discharge.
Background
During operation of a cable system, due to the problems of material aging, manufacturing defects and the like, partial discharge can occur in a cable line and a cable accessory. Partial discharge accelerates the degradation of the insulation of cables and accessories, and even causes insulation breakdown in severe cases. Therefore, there is a need for measuring and monitoring partial discharges in cable systems. The on-line measurement of the partial discharge signal is carried out at the elbow-shaped terminal of the cable, so that the running state of the cable line can be effectively monitored, and the safe and reliable running of the power system is guaranteed.
Although the measurement of the partial discharge of the elbow-shaped terminal of the cable has important significance, the prior art does not realize the accurate measurement of the voltage of the elbow-shaped terminal of the cable, and how to realize the measurement of the partial discharge of the cable is a concern of people.
Disclosure of Invention
In view of the above, the present application provides a device for measuring partial discharge, so as to implement partial discharge of a measuring cable.
In order to achieve the above object, the following solutions are proposed:
an apparatus for measuring partial discharge, comprising: the device comprises a plug, an induction device and a measuring device;
the plug is made of insulating materials, a groove is formed in one side of the plug, a sensing device is arranged on the other side of the plug, and the plug isolates the groove from the sensing device;
the stud is connected with the plug through the groove, the stud is electrically connected with a cable to be measured, and the sensing device is electrically connected with the measuring device;
when the cable to be measured discharges, the induction device induces the potential of the stud bolt to generate induction voltage, and the measuring device obtains the discharge voltage of the cable to be measured by measuring the induction voltage of the induction device.
Optionally, the sensing device includes: the device comprises an induction sheet, a sensor insulating layer, a measuring resistor and a connecting hardware fitting;
the sensor insulating layer is used for isolating the induction sheet and the connecting hardware fitting;
one side of the measuring resistor is electrically connected with the induction sheet, and the other side of the measuring resistor is electrically connected with the connecting hardware fitting;
the connecting hardware fitting is provided with a central through hole and is connected with the ground wire;
the induction sheet is connected with a metal conductor, and the metal conductor penetrates through the sensor insulating layer and extends into the central through hole of the connecting hardware fitting.
Optionally, the measuring device includes: a connector and a pressure gauge;
the connector is connected with the metal conductor and the connecting hardware fitting, is used for transmitting the voltage of the measuring resistor between the metal conductor and the connecting hardware fitting, and is connected with the voltage measurer through a lead.
Optionally, the connector includes: a connector outer conductor, a connector inner conductor, a connector body;
the joint outer conductor and the joint inner conductor are arranged on one side of the connector main body, and the other side of the connector main body is electrically connected with the voltage meter through a lead;
the joint outer conductor is used for being electrically connected with the connecting hardware fitting;
the joint inner conductor is used for being electrically connected with the metal conductor of which the induction sheet extends into the central through hole of the connecting hardware fitting.
Optionally, a thread structure is arranged in the groove;
the groove is electrically connected with the stud bolt through the thread structure.
Optionally, the sensing device is embedded in the plug.
Optionally, the method further includes: an elbow terminal body, a ground wire;
the head of the elbow terminal main body is used for fixing a stud bolt and the plug;
the elbow-shaped terminal main body is used for fixing a cable to be tested;
the ground wire is used to ground the elbow terminal body.
Optionally, the method further includes: a cold-shrink body;
the cold-shrinkage main body is used for being connected with the tail part of the elbow-shaped terminal main body and is of a coaxial structure with the cable to be tested.
Optionally, the method further includes: a tail cover;
the tail cover is arranged at the head of the elbow terminal main body and used for covering the plug.
Optionally, the method further includes: a wire lug;
the lug is arranged at the head of the elbow terminal main body and used for electrically connecting a cable to be tested with the stud bolt.
As can be seen from the foregoing technical solutions, an apparatus for measuring partial discharge provided in an embodiment of the present application includes: end cap, induction system and measuring device, wherein, the end cap comprises insulating material, end cap one side is equipped with the recess, the end cap opposite side is equipped with induction system, the end cap is isolated the recess with induction system, stud pass through the recess with the end cap is connected, stud is connected with the cable electricity that awaits measuring, induction system with measuring device electricity is connected, and when the cable that awaits measuring discharges, induction system responds stud's electric potential produces induced voltage, measuring device is through measuring induction system's induced voltage obtains the discharge voltage of the cable that awaits measuring. This application is through setting up induction system at the end cap, and the purpose of measuring cable partial discharge has been realized to the discharge voltage of response cable to be measured.
Drawings
Fig. 1 is a schematic structural diagram of an apparatus for measuring partial discharge according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of another apparatus for measuring partial discharge according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of an induction device according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a measurement apparatus according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a connector according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of an elbow-shaped terminal of a cable according to an embodiment of the present application;
fig. 7 is an equivalent circuit diagram of an apparatus for measuring partial discharge according to an embodiment of the present disclosure;
fig. 8 is an equivalent circuit diagram of another apparatus for measuring partial discharge according to an embodiment of the present disclosure.
The test method comprises the steps of 1-plug, 2-induction device, 3-measurement device, 4-stud bolt, 5-cable to be tested, 6-elbow terminal main body, 7-ground wire, 8-cold shrinkage main body, 9-tail cover, 10-wire lug, 11-lead, 110-groove, 210-induction sheet, 220-sensor insulating layer, 230-measurement resistor, 240-connecting hardware fitting, 250-metal conductor, 311-joint outer conductor, 312-joint inner conductor, 313-connector main body, 310-connector and 320-voltage measuring device.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.
The inventor of the application finds that the on-line measurement of the partial discharge signal is carried out at the elbow-shaped terminal of the cable, so that the running state of the cable line can be effectively monitored, and the safe and reliable running of the power system is guaranteed. Although the measurement of partial discharges at the elbow termination of a cable is of great significance, the prior art does not achieve an accurate measurement of the voltage at the elbow termination of a cable.
Based on this, in the embodiment of the present application, the sensing device is disposed at the plug 1 to sense the discharge voltage of the cable 5 to be tested. Referring to fig. 1 to 5, the apparatus for measuring partial discharge may include: the device comprises a plug 1, a sensing device 2 and a measuring device 3.
Specifically, as shown in fig. 2, the plug 1 may be a cylindrical structure, a groove 110 is disposed on one side of the plug 1, an induction device 2 is disposed on the other side of the plug 1, and the plug 1 is made of an insulating material and may be used to isolate the groove 110 from the induction device 2.
The stud bolt 4 can be connected with the plug 1 through the groove 110, and the stud bolt 4 can be a cylindrical body which is made of a conductive metal material and has a threaded structure on two sides and can be electrically connected with the cable 5 to be tested. The sensing device 2 may be electrically connected to the measuring device 3 for the measuring device 2 to measure the voltage.
When the cable 5 to be measured discharges, the induction device 2 can induce the potential of the stud bolt 4 electrically connected with the cable 5 to be measured to generate induction voltage, and the measurement device 3 obtains the discharge voltage of the cable 5 to be measured by measuring the induction voltage of the induction device 2.
In the above embodiment, there is provided an apparatus for measuring a partial discharge, the apparatus for measuring a partial discharge including: end cap, induction system, and measuring device. Wherein, the end cap comprises insulating material, end cap one side is equipped with the recess, the end cap opposite side is equipped with induction system, the end cap is isolated the recess with induction system, stud pass through the recess with the end cap is connected, stud is connected with the cable electricity that awaits measuring, induction system with measuring device electricity is connected, and when the cable that awaits measuring discharges, induction system responds to stud's electric potential produces induced voltage, measuring device is through measuring induction system's induced voltage obtains the discharge voltage of the cable that awaits measuring. This application is through setting up induction system in end cap one side, and the purpose of measuring cable partial discharge has been realized to the discharge voltage of response cable that awaits measuring.
Further, as shown in fig. 3, fig. 3 is a schematic structural diagram of an induction device according to an embodiment of the present application, where the induction device includes: the sensor comprises a sensing sheet 210, a sensor insulating layer 220, a measuring resistor 230 and a connecting fitting 240.
Specifically, the sensor insulating layer 220 is made of an insulating material and is used for isolating the sensing piece 210 and the link fitting 240, the resistance of the measuring resistor 230 may be 50 Ω -10M Ω, one side of the measuring resistor 230 is electrically connected to the sensing piece 210, and the other side of the measuring resistor 230 is electrically connected to the link fitting 240. The link hardware 240 is made of a conductive metal material, and has a central through hole in the middle thereof and is connected to a ground line. The sensing piece 210 is connected with a metal conductor 250, and the metal conductor 250 passes through the sensor insulating layer 220 and extends into the central through hole of the link fitting for transmitting the sensing potential on the sensing piece 210.
Further, as shown in fig. 4, the measuring device 3 includes a connector 310 and a pressure measuring device 320.
Specifically, the Connector 310 may be a BNC (Bayonet Nut Connector) Connector, one side of the Connector 310 is electrically connected to the metal conductor 250 and the link fitting 240 on the sensing strip 210, and the other side of the Connector 310 is connected to the voltage measuring device 320 through the wire 11, and the Connector 310 is configured to transmit the voltage of the measuring resistor 230 between the sensing strip 210 and the link fitting 240 to the voltage measuring device 320. The voltage measuring device 320 may measure the voltage of the measuring resistor 230 between the sensing piece 210 and the link fitting 240 through the conducting wire 11, and further may display the measured voltage.
Further, as shown in fig. 5, the connector 310 may include a contact outer conductor 311, a contact inner conductor 312, and a connector body 313.
Specifically, the joint outer conductor 311 and the joint inner conductor 312 are arranged on one side of the connector main body 313, the joint outer conductor 311 and the joint inner conductor 312 are both made of conductive metal materials, the other side of the connector main body 313 is electrically connected with the voltage measuring device 320 through the lead 11, the outer part of the connector main body 313 is made of insulating materials, and the inner part of the connector main body is electrically connected with the extension part of the lead on the other side of the connector main body through the joint outer conductor and the extension part of the joint inner conductor. The joint outer conductor 311 is used for electrically connecting with the link fitting 240, and the joint inner conductor 312 is used for electrically connecting with the metal conductor 250 of the induction plate 210 extending into the central through hole of the link fitting.
In some embodiments of the present application, for the connection structure of the groove 110 of the plug 1 and the stud bolt 4, in order to better fix the plug 1 and the stud bolt 4, a thread structure may be further disposed in the groove 110, and the groove 110 is electrically connected to the stud bolt 4 through the thread structure.
In some embodiments of the present application, for the connection structure of the sensing device 2 and the plug 1, the sensing device 2 may be embedded in the plug 1, as shown in fig. 1, in consideration of the sensing sensitivity and the sensing range of the sensing device 2, and in consideration of material saving and the like.
In some embodiments of the present application, as shown in fig. 6, the present device for measuring partial discharge may further include an elbow terminal body 6, a ground line 7.
Specifically, the elbow terminal main body 6 is made of an insulating material and integrally forms a T-shaped structure, the head of the elbow terminal main body 6 is used for fixing the stud bolt 4 and the plug 1, and the elbow terminal main body 6 is used for fixing the cable 5 to be tested. The ground wire 7 is used to ground the elbow terminal body 6, and may be provided in the middle of the elbow terminal body 6.
In some embodiments of the present application, considering that metal has the property of expanding with heat and contracting with cold, the cable 5 to be measured may be unstably connected to the elbow terminal body 6 due to cold contraction, and as shown in fig. 5, the present device for measuring partial discharge may further include a cold-contracted body 8.
Specifically, the cold-shrink main body 8 is made of an insulating material with cold-shrink characteristics, is used for being connected with the tail portion of the elbow terminal main body 6, is of a coaxial structure with the cable 5 to be tested, and is used for connecting and fixing the cable 5 to be tested with the elbow terminal main body 6.
In some embodiments of the present application, in order to protect the sensitivity of the sensing device in the plug, the device for measuring partial discharge may further include a tail cap 9, considering that the natural environment of the plug may be exposed to wind, rain, sunlight, etc.
Specifically, the tail cover 9 is composed of an insulating material, and is arranged at the head of the elbow terminal main body 6, so that the head 1 is covered, the sensitivity of the sensing device 2 is prevented from being reduced, the connecting fitting 240 is prevented from rusting, a groove is formed in one side of the tail cover 9, the groove of the tail cover 9 can be matched and fixed with the connecting fitting 240 of the sensing device 2, and the fixing form can be a buckle structure.
In some embodiments of the present application, considering that the cable 5 to be measured is composed of a plurality of wires, and is inconvenient to electrically connect with the stud bolt 4, and may be detached, the device for measuring partial discharge may further include a lug 10.
Specifically, lug 10 comprises the conductive metal material, sets up the head at elbow terminal main part 6 for with the cable 5 that awaits measuring with stud 4 electricity is connected, and 10 crimping of lug one side is on the cable 5 that awaits measuring, and the opposite side is equipped with the through-hole, and stud 4 can pass the through-hole of lug 10 and fix lug 10, utilizes lug 10 to realize that the cable 5 that awaits measuring is connected with stud 4 electricity.
In some embodiments of the present application, as shown in FIG. 7, FIG. 7 provides an equivalent circuit diagram of a device for measuring partial discharge, capacitor CkIs an equivalent capacitor between the thread structure and the induction sheet, capacitor CDIs a capacitor, a resistor R between the induction sheet and the connecting hardware fittingDIs the capacitance between the induction sheet and the connecting hardware fitting, the capacitance CaIs the equivalent capacitance between the cable conductor and the cable ground plane, CCEquivalent capacitance in the air gap during partial discharge, Cb1Is the equivalent capacitance between the air gap and the cable conductor, Cb2Is the equivalent capacitance between the air gap and the cable ground plane. The equivalent circuit of the whole partial discharge measurement loop is shown in fig. 8.
Measuring the time constant τ of the circuitDCan be expressed as formula (1) when τ isDMuch larger than the time constant tau of partial discharge0While measuring the voltage UD(t) may be represented in the form of formula (2):
when tau isDNot satisfying a time constant τ much greater than a partial discharge0Under the condition of (1), measuring the voltage UD(t) may be represented by the form of formula (3). Wherein q isaApparent discharge amount which is partial discharge; cTThe equivalent resistance is expressed by the formula (4):
through the calculation steps of the equivalent circuit, the partial discharge voltage U of the cable 5 to be measured can be obtainedD(t)。
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, the embodiments can be combined with each other, and the same and similar parts can be referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An apparatus for measuring partial discharge, comprising: the device comprises a plug, an induction device and a measuring device;
the plug is made of insulating materials, a groove is formed in one side of the plug, a sensing device is arranged on the other side of the plug, and the plug isolates the groove from the sensing device;
the stud is connected with the plug through the groove, the stud is electrically connected with a cable to be measured, and the sensing device is electrically connected with the measuring device;
when the cable to be measured discharges, the induction device induces the potential of the stud bolt to generate induction voltage, and the measuring device obtains the discharge voltage of the cable to be measured by measuring the induction voltage of the induction device.
2. The apparatus of claim 1, wherein the sensing device comprises: the device comprises an induction sheet, a sensor insulating layer, a measuring resistor and a connecting hardware fitting;
the sensor insulating layer is used for isolating the induction sheet and the connecting hardware fitting;
one side of the measuring resistor is electrically connected with the induction sheet, and the other side of the measuring resistor is electrically connected with the connecting hardware fitting;
the connecting hardware fitting is provided with a central through hole and is connected with the ground wire;
the induction sheet is connected with a metal conductor, and the metal conductor penetrates through the sensor insulating layer and extends into the central through hole of the connecting hardware fitting.
3. The apparatus of claim 1, wherein the measuring device comprises: a connector and a pressure gauge;
the connector is connected with the metal conductor and the connecting hardware fitting, is used for transmitting the voltage of the measuring resistor between the metal conductor and the connecting hardware fitting, and is connected with the voltage measurer through a lead.
4. The apparatus of claim 3, wherein the connector comprises: a connector outer conductor, a connector inner conductor, a connector body;
the joint outer conductor and the joint inner conductor are arranged on one side of the connector main body, and the other side of the connector main body is electrically connected with the voltage meter through a lead;
the joint outer conductor is used for being electrically connected with the connecting hardware fitting;
the joint inner conductor is used for being electrically connected with the metal conductor of which the induction sheet extends into the central through hole of the connecting hardware fitting.
5. The device of claim 1, wherein a threaded structure is provided in the recess;
the groove is electrically connected with the stud bolt through the thread structure.
6. The device of claim 1, wherein the sensing device is embedded in the plug.
7. The apparatus of claim 1, further comprising: an elbow terminal body, a ground wire;
the head of the elbow terminal main body is used for fixing a stud bolt and the plug;
the elbow-shaped terminal main body is used for fixing a cable to be tested;
the ground wire is used to ground the elbow terminal body.
8. The apparatus of claim 1, further comprising: a cold-shrink body;
the cold-shrinkage main body is used for being connected with the tail part of the elbow-shaped terminal main body and is of a coaxial structure with the cable to be tested.
9. The apparatus of claim 1, further comprising: a tail cover;
the tail cover is arranged at the head of the elbow terminal main body and used for covering the plug.
10. The apparatus of claim 1, further comprising: a wire lug;
the lug is arranged at the head of the elbow terminal main body and used for electrically connecting a cable to be tested with the stud bolt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111469779.8A CN114113949A (en) | 2021-12-03 | 2021-12-03 | Device for measuring partial discharge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111469779.8A CN114113949A (en) | 2021-12-03 | 2021-12-03 | Device for measuring partial discharge |
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| CN114113949A true CN114113949A (en) | 2022-03-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111469779.8A Pending CN114113949A (en) | 2021-12-03 | 2021-12-03 | Device for measuring partial discharge |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114113863A (en) * | 2021-12-03 | 2022-03-01 | 华北电力大学 | Harmonic voltage on-line measuring device and method for elbow-shaped terminal of high-voltage cable |
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| JPH08146076A (en) * | 1994-11-25 | 1996-06-07 | Takaoka Electric Mfg Co Ltd | Partial discharge detector of gas insulated switch device |
| WO2011036325A1 (en) * | 2009-09-25 | 2011-03-31 | Instituto De Tecnología Eléctrica Ite | System for measuring partial discharges in power lines |
| CN108711817A (en) * | 2018-08-16 | 2018-10-26 | 四川瑞霆电力科技有限公司 | The insulation plug of elbow-type cable connector with temp sensing function |
| CN112034236A (en) * | 2020-09-07 | 2020-12-04 | 华北电力大学 | Online monitoring device and method for transient voltage of cable elbow terminal |
| CN112034235A (en) * | 2020-09-07 | 2020-12-04 | 广东电网有限责任公司广州供电局 | Device and method suitable for measuring power frequency voltage of T-shaped cable connector |
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2021
- 2021-12-03 CN CN202111469779.8A patent/CN114113949A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08146076A (en) * | 1994-11-25 | 1996-06-07 | Takaoka Electric Mfg Co Ltd | Partial discharge detector of gas insulated switch device |
| WO2011036325A1 (en) * | 2009-09-25 | 2011-03-31 | Instituto De Tecnología Eléctrica Ite | System for measuring partial discharges in power lines |
| CN108711817A (en) * | 2018-08-16 | 2018-10-26 | 四川瑞霆电力科技有限公司 | The insulation plug of elbow-type cable connector with temp sensing function |
| CN112034236A (en) * | 2020-09-07 | 2020-12-04 | 华北电力大学 | Online monitoring device and method for transient voltage of cable elbow terminal |
| CN112034235A (en) * | 2020-09-07 | 2020-12-04 | 广东电网有限责任公司广州供电局 | Device and method suitable for measuring power frequency voltage of T-shaped cable connector |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114113863A (en) * | 2021-12-03 | 2022-03-01 | 华北电力大学 | Harmonic voltage on-line measuring device and method for elbow-shaped terminal of high-voltage cable |
| CN114113863B (en) * | 2021-12-03 | 2022-10-28 | 华北电力大学 | Harmonic voltage on-line measuring device and method for elbow-shaped terminal of high-voltage cable |
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