CN113504441A - High-voltage pole and tower insulation fault monitoring and positioning sensor and design method - Google Patents
High-voltage pole and tower insulation fault monitoring and positioning sensor and design method Download PDFInfo
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- CN113504441A CN113504441A CN202110792789.9A CN202110792789A CN113504441A CN 113504441 A CN113504441 A CN 113504441A CN 202110792789 A CN202110792789 A CN 202110792789A CN 113504441 A CN113504441 A CN 113504441A
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- 238000009413 insulation Methods 0.000 title claims abstract description 73
- 238000012544 monitoring process Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000002955 isolation Methods 0.000 claims abstract description 56
- 239000003990 capacitor Substances 0.000 claims abstract description 45
- 239000012212 insulator Substances 0.000 claims abstract description 15
- 239000002184 metal Substances 0.000 claims abstract description 11
- 230000007797 corrosion Effects 0.000 claims description 4
- 238000005260 corrosion Methods 0.000 claims description 4
- 239000004020 conductor Substances 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 1
- 238000009422 external insulation Methods 0.000 description 1
- 238000009421 internal insulation Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
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Abstract
The application discloses high-voltage tower insulation fault monitoring and positioning sensor and design method, high-voltage tower insulation fault monitoring and positioning sensor includes first connecting electrode, high-voltage isolation capacitor, connecting electrode line, location early warning unit and second connecting electrode, the one end of first connecting electrode with insulator supports metal accessories and connects, and when insulation fault takes place, introduces the sensor with the voltage and the electric current of high-voltage tower insulation fault. The first connecting electrode, the high-voltage isolating capacitor and the positioning early warning unit are sequentially connected, the connecting electrode wire introduces voltage and current output by the high-voltage isolating capacitor into the positioning early warning unit, and the other end of a loop of the positioning early warning unit is grounded through the second connecting electrode. The sensor disclosed by the application can monitor and position the insulation fault of the high-voltage tower, and supply power by utilizing the voltage and the current generated by the insulation fault without system energy taking. The structure is simple, the maturity of the component is high, the economy is good, and the service life is long.
Description
Technical Field
The application relates to the field of monitoring and positioning of insulation faults of electric power systems, in particular to a high-voltage tower insulation fault monitoring and positioning sensor and a design method.
Background
The high-medium voltage distribution network insulator, the lightning arrester, the high-voltage switch equipment, the cable and the like have insulation faults to the ground, and the fault current is small, such as pin insulator breakdown and lightning arrester insulation damage, and can be less than 100 mA. The existing detection technology cannot sense such insulation faults, and the faults can cause personal electric shock and user power failure if existing for a long time, and even cause forest fire seriously.
In the prior art, whether insulation faults occur in power equipment is judged by detecting the zero sequence voltage, the phase angle and the amplitude of three-phase voltage and the zero sequence current of a line of a system, but the method cannot sensitively detect and position the insulation faults of the small fault current of the high-voltage tower. The insulation fault monitoring and positioning technology for the high-medium voltage distribution network tower is a pending technical problem which puzzles at home and abroad for a long time.
Disclosure of Invention
The application provides a high-voltage tower insulation fault monitoring and positioning sensor and a design method thereof, which aim to solve the technical problem that in the prior art, the small fault current insulation fault of a high-voltage tower cannot be sensitively detected and positioned.
This application first aspect discloses a high voltage tower insulation fault monitoring positioning sensor, high voltage tower insulation fault monitoring positioning sensor includes: the device comprises a first connecting electrode, a high-voltage isolating capacitor, a connecting electrode wire, a positioning early warning unit and a second connecting electrode;
the top end of the high-voltage tower is provided with an insulator supporting metal accessory;
one end of the first connecting electrode is connected with the insulator supporting metal accessory, the other end of the first connecting electrode is connected with the high-voltage isolation capacitor, the first connecting electrode is used for introducing voltage and current of the high-voltage pole and tower insulation fault into the high-voltage isolation capacitor, and the high-voltage isolation capacitor is used for high-voltage isolation;
the high-voltage isolation capacitor is connected with the positioning early warning unit through the connecting electrode wire, and the connecting electrode wire is used for introducing the voltage and the current output by the high-voltage isolation capacitor into the positioning early warning unit;
the positioning early warning unit is connected with the second connecting electrode through the connecting electrode wire.
Optionally, the positioning early warning unit includes a rectifying module, a voltage stabilizing module and a positioning early warning module, and is configured to supply power through voltage and current introduced by the high-voltage isolation capacitor and send fault early warning or fault isolation information.
Optionally, the first connection electrode and the second connection electrode are corrosion-resistant conductors.
Optionally, the ground resistance of the second connection electrode is less than 30 Ω.
Optionally, the connecting electrode wire is an insulated wire.
The second aspect of the application discloses a design method of a high-voltage tower insulation fault monitoring and positioning sensor, the design method of the high-voltage tower insulation fault monitoring and positioning sensor is applied to the high-voltage tower insulation fault monitoring and positioning sensor disclosed by the first aspect of the application, and the design method of the high-voltage tower insulation fault monitoring and positioning sensor comprises the following steps:
acquiring voltage and current of the insulation fault of the high-voltage tower, and determining target energy;
determining a high-voltage isolation capacitance value according to the target energy, a preset angular frequency, a preset capacity margin coefficient and a preset relative ground rated voltage of the high-voltage tower;
determining the insulation level of the high-voltage capacitor according to the rated voltage relative to the ground;
acquiring an input end rated voltage preset by a positioning early warning unit;
determining the input impedance of the positioning early warning unit according to the input end rated voltage, the relative ground rated voltage, the high-voltage isolation capacitance value and the angular frequency;
and checking the input impedance according to a preset lightning impulse voltage.
Optionally, the target energy includes energy of the fault pre-warning, energy of the fault isolation information, and energy lost by the positioning pre-warning unit.
Optionally, the determining a high-voltage isolation capacitance value according to the target energy, a preset angular frequency, a preset capacity margin coefficient, and a preset ground-to-earth rated voltage of the high-voltage tower includes:
calculating the high voltage isolation capacitance value by the following formula:
wherein C represents the high voltage isolation capacitance value, K represents the capacity margin coefficient, P represents the target energy, ω represents the angular frequency, U represents the target energy, andnrepresenting the relative ground voltage rating.
Optionally, the rated voltage of the input end of the positioning early warning unit is any value from 10V to 400V.
Optionally, the calibrating the input impedance according to a preset lightning impulse voltage includes:
checking the input impedance by the following formula:
wherein Z isinRepresents the input impedance, ω represents the angular frequency, C represents the high voltage isolation capacitance value, UcjRepresenting the lightning surge voltage.
The application discloses high-voltage pole tower insulation fault monitoring and positioning sensor and design method relates to the field of electric power system insulation fault monitoring and positioning, the high-voltage pole tower insulation fault monitoring and positioning sensor comprises a first connecting electrode, a high-voltage isolating capacitor, a connecting electrode wire, a positioning early warning unit and a second connecting electrode, one end of the first connecting electrode is connected with an insulator supporting metal accessory, and when an insulation fault occurs, the voltage and current of the high-voltage pole tower insulation fault are introduced into the sensor. The first connecting electrode, the high-voltage isolating capacitor and the positioning early warning unit are sequentially connected, the connecting electrode wire introduces introduced voltage and current into the positioning early warning unit, and the other end of the positioning early warning unit loop is grounded through the second connecting electrode. The sensor disclosed by the application can monitor and position the insulation fault of the high-voltage tower, and supply power by utilizing the voltage and the current generated by the insulation fault without system energy taking. The structure is simple, the maturity of the component is high, the economy is good, and the service life is long.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a high-voltage tower insulation fault monitoring and positioning sensor provided in an embodiment of the present application;
fig. 2 is a schematic structural diagram of another high-voltage tower insulation fault monitoring and positioning sensor provided in the embodiment of the present application;
fig. 3 is a schematic structural diagram of a positioning early warning unit in the high-voltage tower insulation fault monitoring and positioning sensor provided in the embodiment of the present application;
fig. 4 is a schematic workflow diagram of a design method of a high-voltage tower insulation fault monitoring positioning sensor according to an embodiment of the present application;
illustration of the drawings:
the method comprises the following steps of 1-a first connecting electrode, 2-a high-voltage isolating capacitor, 3-a connecting electrode wire, 4-a second connecting electrode, 5-a positioning early warning unit, 6-a high-voltage tower, 7-a metal accessory and 8-an insulator.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely 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.
In order to solve the technical problem that the small fault current insulation fault of the high-voltage tower 6 cannot be sensitively detected and positioned in the prior art, the application discloses a high-voltage tower insulation fault monitoring and positioning sensor and a design method thereof through the following embodiments.
Referring to fig. 1, a schematic structural diagram of a high-voltage tower insulation fault monitoring and positioning sensor provided in an embodiment of the present application is shown, where the sensor includes: the device comprises a first connecting electrode 1, a high-voltage isolating capacitor 2, a connecting electrode line 3, a positioning early warning unit 5 and a second connecting electrode 4.
In some embodiments of the present application, the first connecting electrode 1 and the second connecting electrode 4 are corrosion-resistant conductors. The first connecting electrode 1 introduces voltage and current generated by an insulation fault to the sensor. The grounding resistance of the second connecting electrode 4 is less than 30 omega, and the special design can be more than 30 omega.
In some embodiments of the present application, the connecting electrode wire 3 is an insulated wire, and has good corrosion resistance.
In some embodiments of the present application, the ground resistance of the second connection electrode 4 is less than 30 Ω.
And an insulator supporting metal accessory 7 is arranged at the top end of the high-voltage tower 6. And the upper end of the insulating support metal accessory 7 is provided with an insulator 8, a lightning arrester, a mutual inductor, a switch and other equipment.
Any capacitor can be selected for the high-voltage isolation capacitor 2, and the internal insulation strength and the external insulation strength should meet the requirements of the corresponding monitored system insulator 8.
One end of the first connecting electrode 1 is connected with the insulator supporting metal accessory 7, the other end of the first connecting electrode 1 is connected with the high-voltage isolating capacitor 2, the first connecting electrode 1 is used for introducing voltage and current of the insulation fault of the high-voltage tower 6 into the high-voltage isolating capacitor 2, and the high-voltage isolating capacitor 2 is used for high-voltage isolation.
The high-voltage isolation capacitor 2 is connected with the positioning early warning unit 5 through the connecting electrode wire 3, and the connecting electrode wire 3 is used for introducing the voltage and the current output by the high-voltage isolation capacitor 2 into the positioning early warning unit 5.
The positioning early warning unit 5 is connected with the second connecting electrode 4 through the connecting electrode wire 3.
The voltage and the current introduced by the high-voltage isolation capacitor 2 provide energy required for detection and simultaneous sending of fault early warning or fault isolation information for the positioning early warning unit 5. And after the fault is removed, the positioning early warning unit 5 automatically returns.
As shown in fig. 2, in some embodiments of the present application, the high-voltage tower 6 is a high-voltage grounding tower, for the high-voltage grounding tower, one end of the connecting electrode 1 is connected to a grounding wire of the tower, the other end of the connecting electrode 1 is connected to a high-voltage isolation capacitor, the connecting electrode line 3 is connected to the positioning early warning unit 5, and the other end of the loop of the positioning early warning unit 5 is grounded via the connecting electrode 4. The connecting electrode 1 introduces voltage and current flowing into the ground from the top end of the tower into the sensor, and the connecting electrode wire 3 connects the voltage and current transmitted by the high-voltage isolation capacitor into the positioning early warning unit 5.
As shown in fig. 3, in some embodiments of the present application, the positioning and early warning unit 5 includes a rectifying module, a voltage stabilizing module, and a positioning and early warning module, and is configured to supply power through voltage and current introduced by the high-voltage isolation capacitor 2, and send fault early warning or fault isolation information.
The application discloses a high voltage tower insulation fault monitoring positioning sensor can be with fault location to shaft tower according to the mounted position of sensor. The sensor can be installed without power failure, the operation of the system is not influenced by the self fault of the sensor, and the detection is convenient. The sensor is powered by fault voltage and current generated by the insulation fault of the tower, and energy is not required to be acquired by the system. The sensor has simple structure, high maturity of components, good economy and long service life. The sensor can detect the mA-level insulation fault of the tower.
The utility model discloses a high-voltage tower insulation fault monitoring positioning sensor, including first connecting electrode 1, high-voltage isolation capacitor 2, connecting electrode line 3, location early warning unit 5 and second connecting electrode 4, first connecting electrode 1's one end with insulator supports metal accessories 7 and connects, when insulating fault takes place, introduces the sensor with the voltage and the electric current of 6 insulation fault of high-voltage tower. The first connecting electrode 1, the high-voltage isolating capacitor 2 and the positioning early warning unit 5 are sequentially connected, the connecting electrode wire 3 introduces introduced voltage and current into the positioning early warning unit 5, and the other end of the loop of the positioning early warning unit 5 is grounded through the second connecting electrode 4. The sensor disclosed by the application can monitor and position the 6 insulation faults of the high-voltage tower, and supply power by using the voltage and the current generated by the insulation faults without system energy taking. The structure is simple, the maturity of the component is high, the economy is good, and the service life is long.
Referring to a schematic working flow diagram of fig. 4, an embodiment of the present application provides a design method for a high-voltage tower insulation fault monitoring and positioning sensor, where the design method is applied to a high-voltage isolation capacitor and a positioning early warning unit in the high-voltage tower insulation fault monitoring and positioning sensor disclosed in the embodiment of the present application, and the design method for the high-voltage tower insulation fault monitoring and positioning sensor includes the following steps:
and S101, acquiring voltage and current of the insulation fault of the high-voltage tower 6, and determining target energy.
Further, the target energy includes energy of the fault pre-warning, energy of the fault isolation information, and energy lost by the positioning pre-warning unit 5. The target energy is typically less than 2W.
And S102, determining a high-voltage isolation capacitance value according to the target energy, a preset angular frequency, a preset capacity margin coefficient and a preset relative ground rated voltage of the high-voltage tower 6.
And the rated power frequency withstand voltage and the rated lightning impulse withstand level of the high-voltage isolation capacitor are matched with the relative ground rated voltage.
Further, the determining a high-voltage isolation capacitance value according to the target energy, a preset angular frequency, a preset capacity margin coefficient and a preset ground-to-earth rated voltage of the high-voltage tower 6 includes:
calculating the high voltage isolation capacitance value by the following formula:
wherein C represents the high voltage isolation capacitance value, K represents the capacity margin coefficient, P represents the target energy, ω represents the angular frequency, U represents the target energy, andnrepresenting the relative ground voltage rating.
Wherein, K is a constant of 1-10, and is predetermined according to the actual scene.
And step S103, determining the insulation level of the high-voltage capacitor according to the rated voltage of the relative earth. Wherein the high voltage capacitor insulation level comprises: the high-voltage isolation capacitor has rated power frequency withstand voltage and rated lightning impulse withstand voltage.
And step S104, acquiring the rated voltage of the input end preset by the positioning early warning unit 5.
Furthermore, the rated voltage of the input end of the positioning early warning unit is any value from 10V to 400V and is determined in advance according to an actual scene.
Step S105, determining an input impedance of the positioning and early warning unit 5 according to the input end rated voltage, the relative ground rated voltage, the high-voltage isolation capacitance value, and the angular frequency.
And S106, checking the input impedance according to preset lightning impulse voltage.
Wherein the lightning impulse voltage UcjIs the standard surge voltage experienced by the system insulator 8 being monitored.
Further, the calibrating the input impedance according to the preset lightning impulse voltage includes:
checking the input impedance by the following formula:
wherein Z isinRepresents the input impedance, ω represents the angular frequency, C represents the high voltage isolation capacitance value, UcjRepresenting the lightning surge voltage.
The high-voltage isolation capacitor 2 and the positioning early warning unit 5 are designed through the steps.
To facilitate understanding of the above steps, the present embodiment explains the above steps by the following examples.
Example (c): and determining that the energy P required by the positioning early warning unit is 2W. If the rated voltage of the monitored pole tower system is 10kV, the relative ground rated voltage Un of the system is 5.78kV, and the capacity margin coefficient K is 10,
the rated power frequency withstand voltage of the high-voltage isolation capacitor is 42/1.73kV, and the rated lightning impulse withstand voltage is 75 kV. The rated voltage of the input end of the positioning early warning unit is selected to be less than 400V, and Uin can be selected to be 200V. Calculating the input impedance Zin of the designed positioning early warning unit
To obtain ZinAnd Zc is high-voltage isolation capacitance capacitive reactance. The lightning impulse voltage verifies whether the input impedance is adequate,
and the design requirements are met. And designing the high-voltage isolating capacitor 2 and the positioning early warning unit 5 according to the rated voltage Uin, the input impedance Zin and the power P.
The present application has been described in detail with reference to specific embodiments and illustrative examples, but the description is not intended to limit the application. Those skilled in the art will appreciate that various equivalent substitutions, modifications or improvements may be made to the presently disclosed embodiments and implementations thereof without departing from the spirit and scope of the present disclosure, and these fall within the scope of the present disclosure. The protection scope of this application is subject to the appended claims.
Claims (10)
1. The utility model provides a high voltage tower insulation fault monitoring positioning sensor which characterized in that, high voltage tower insulation fault monitoring positioning sensor includes: the device comprises a first connecting electrode, a high-voltage isolating capacitor, a connecting electrode wire, a positioning early warning unit and a second connecting electrode;
the top end of the high-voltage tower is provided with an insulator supporting metal accessory;
one end of the first connecting electrode is connected with the insulator supporting metal accessory, the other end of the first connecting electrode is connected with the high-voltage isolation capacitor, the first connecting electrode is used for introducing voltage and current of the high-voltage pole and tower insulation fault into the high-voltage isolation capacitor, and the high-voltage isolation capacitor is used for high-voltage isolation;
the high-voltage isolation capacitor is connected with the positioning early warning unit through the connecting electrode wire, and the connecting electrode wire is used for introducing the voltage and the current output by the high-voltage isolation capacitor into the positioning early warning unit;
the positioning early warning unit is connected with the second connecting electrode through the connecting electrode wire.
2. The high-voltage tower insulation fault monitoring and positioning sensor as claimed in claim 1, wherein the positioning early warning unit comprises a rectifying module, a voltage stabilizing module and a positioning early warning module, and is used for supplying power through voltage and current introduced by the high-voltage isolation capacitor and sending fault early warning or fault isolation information.
3. The high-voltage tower insulation fault monitoring and positioning sensor as recited in claim 1, wherein the first connecting electrode and the second connecting electrode are corrosion-resistant conductors.
4. The high-voltage tower insulation fault monitoring and positioning sensor as recited in claim 1, wherein the ground resistance of the second connection electrode is less than 30 Ω.
5. The high-voltage tower insulation fault monitoring and positioning sensor as recited in claim 1, wherein the connecting electrode wire is an insulated wire.
6. A design method of a high-voltage pole and tower insulation fault monitoring and positioning sensor is characterized in that the design method of the high-voltage pole and tower insulation fault monitoring and positioning sensor is applied to a high-voltage isolation capacitor and a positioning early warning unit in the high-voltage pole and tower insulation fault monitoring and positioning sensor of any one of claims 1 to 5, and the design method of the high-voltage pole and tower insulation fault monitoring and positioning sensor comprises the following steps:
acquiring voltage and current of the insulation fault of the high-voltage tower, and determining target energy;
determining a high-voltage isolation capacitance value according to the target energy, a preset angular frequency, a preset capacity margin coefficient and a preset relative ground rated voltage of the high-voltage tower;
determining the insulation level of the high-voltage capacitor according to the rated voltage relative to the ground;
acquiring an input end rated voltage preset by a positioning early warning unit;
determining the input impedance of the positioning early warning unit according to the input end rated voltage, the relative ground rated voltage, the high-voltage isolation capacitance value and the angular frequency;
and checking the input impedance according to a preset lightning impulse voltage.
7. The design method of the high-voltage tower insulation fault monitoring and positioning sensor as claimed in claim 6, wherein the target energy comprises energy of the fault early warning, energy of the fault isolation information and energy lost by the positioning early warning unit.
8. The design method of the high-voltage tower insulation fault monitoring and positioning sensor as claimed in claim 6, wherein the determining the high-voltage isolation capacitance value according to the target energy, the preset angular frequency, the preset capacity margin coefficient and the preset relative ground rated voltage of the high-voltage tower comprises:
calculating the high voltage isolation capacitance value by the following formula:
wherein C represents the high voltage isolation capacitance value, K represents the capacity margin coefficient, P represents the target energy, ω represents the angular frequency, U represents the target energy, andnrepresenting the relative ground voltage rating.
9. The design method of the high-voltage pole tower insulation fault monitoring and positioning sensor as claimed in claim 6, wherein the rated voltage of the input end of the positioning early warning unit is any value from 10V to 400V.
10. The design method of the high-voltage tower insulation fault monitoring and positioning sensor as claimed in claim 6, wherein the calibrating the input impedance according to the preset lightning impulse voltage comprises:
checking the input impedance by the following formula:
wherein Z isinRepresents the input impedance, ω represents the angular frequency, C represents the high voltage isolation capacitance value, UcjRepresenting the lightning surge voltage.
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| CN202110792789.9A CN113504441A (en) | 2021-07-14 | 2021-07-14 | High-voltage pole and tower insulation fault monitoring and positioning sensor and design method |
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2021
- 2021-07-14 CN CN202110792789.9A patent/CN113504441A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09152456A (en) * | 1995-11-30 | 1997-06-10 | Fuji Electric Co Ltd | Device and method for detecting ground fault |
| CN101592691A (en) * | 2008-05-30 | 2009-12-02 | 王巨丰 | Transmission line thunderbolt, counterattack arbiter |
| US20160377670A1 (en) * | 2013-11-22 | 2016-12-29 | Mitsubishi Electric Corporation | Insulation detector and electric apparatus |
| CN107037308A (en) * | 2017-05-16 | 2017-08-11 | 国网新疆电力公司昌吉供电公司 | Insulator electric leakage remote alarming device |
| CN210775723U (en) * | 2019-06-17 | 2020-06-16 | 贵州电网有限责任公司 | Simulation test device for heating characteristics of zero-value insulator string |
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Application publication date: 20211015 |