CN114200262B - High-voltage cable elbow terminal partial discharge and transient steady state voltage on-line measuring device - Google Patents
High-voltage cable elbow terminal partial discharge and transient steady state voltage on-line measuring device Download PDFInfo
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- CN114200262B CN114200262B CN202111466667.7A CN202111466667A CN114200262B CN 114200262 B CN114200262 B CN 114200262B CN 202111466667 A CN202111466667 A CN 202111466667A CN 114200262 B CN114200262 B CN 114200262B
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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
- G01R31/1263—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 of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—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 of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention discloses an online measuring device for local discharge and temporary steady-state voltage of an elbow terminal of a high-voltage cable, which comprises a connecting hardware fitting, wherein one end of the connecting hardware fitting, which is embedded into a plug of the elbow terminal of the cable, is connected with an induction sheet in an insulating manner, a BNC joint is arranged in the connecting hardware fitting, and an inner conductor of the BNC joint is electrically connected with the induction sheet; the measuring resistor is electrically connected with the induction sheet and the connecting hardware fitting. The cable elbow terminal positioning device is suitable for being integrated in the cable elbow terminal, and can accurately position the voltage of the cable elbow terminal, so that the safe and stable operation of a cable is ensured.
Description
Technical Field
The invention relates to the field of voltage measuring devices, in particular to an online measuring device for local discharge and transient steady-state voltage of an elbow-shaped terminal of a high-voltage cable.
Background
The cable system is an important part in the power system, and the reliability of the cable system is related to whether a power grid can safely and stably operate. The cable elbow termination is a critical component of the cable system and it is of paramount importance that it be accurately measured, reliably controlled and timely protected. The structure of the existing cable elbow terminal is shown in fig. 1, and the existing cable elbow terminal comprises a T-shaped shell 1, a cable high-voltage conductor 2 penetrates into the T-shaped shell 1 from the lower end of the vertical section of the T-shaped shell 1, and then penetrates out from the end part of the left end of the horizontal section of the T-shaped shell 1, and a cold-shrinkage main body 3 coaxially sleeved on the cable high-voltage conductor 2 is arranged at the lower end of the vertical section of the T-shaped shell 1. The right end of the horizontal section of the T-shaped shell 1 is provided with a plugging hole communicated with the inside of the T-shaped shell 1, a plug 9 is arranged in the plugging hole, the plug 9 is provided with a threaded structure 8 towards the left end of the cable high-voltage conductor 2 and is connected with a stud bolt 4 through the threaded structure 8, the stud bolt 4 is connected with a lug 5 and is used for integrally crimping the cable high-voltage conductor 2, the threaded structure 8 is electrically connected with the cable high-voltage conductor 2 through the stud bolt 4, the free end part of the stud bolt 4 and the joint structure of the lug 5 and the cable high-voltage conductor 2 are fixed on a switch cabinet support through the plug 9, a tail cover 6 is connected to the right end of the plug 9 in a screwing manner and is used for sealing the plugging hole at the right end of the T-shaped shell 1, and the outer side wall of the vertical section of the T-shaped shell 1 is provided with a grounding wire 7 and used for electrical grounding.
In the use process of the elbow-shaped terminal of the cable, electrical safety hidden dangers exist, such as fault voltage, partial discharge voltage caused by aging and the like, and the voltages are all caused by the voltage generated by a high-voltage conductor of the cable. Since the cable high voltage conductor 2 is located inside the T-shaped housing 1, it is difficult to directly measure the voltage of the cable high voltage conductor 2. Although the prior art has an induction type voltage transformer, a capacitance type voltage transformer and the like which can be used for measuring the voltage of a conductor, the measuring devices have large scale and complex structure, are limited by the structure of the elbow-shaped terminal of the cable, and are difficult to be integrated on the elbow-shaped terminal of the cable to measure the voltage of the high-voltage conductor 2 of the cable. Therefore, it is necessary to design a device capable of inductively measuring the voltage of the high-voltage cable conductor inside the elbow-shaped terminal of the cable.
Disclosure of Invention
The invention aims to provide an online measuring device for partial discharge and transient steady-state voltage of a high-voltage cable elbow terminal, which solves the problem that the voltage of a cable high-voltage conductor in the cable elbow terminal in the prior art is difficult to measure.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
high tension cable elbow terminal partial discharge and transient steady state voltage on-line measuring device, cable elbow terminal is provided with the end cap, the end cap is connected with the bolt through helicitic texture, the bolt is connected with the cable high voltage conductor electricity in the cable elbow terminal, its characterized in that: including signal sensing unit and signal acquisition processing unit, wherein:
the signal sensing unit comprises a connecting hardware fitting, an induction sheet, a measuring resistor and a signal output joint; the induction sheet is embedded in the plug of the cable elbow terminal, one surface of the induction sheet serves as an induction surface facing a threaded structure in the plug of the cable elbow terminal, and the induction sheet serves as an embedded electrode and is used for sensing the voltage of a part of the cable elbow terminal between the threaded structure and the induction sheet; one end of the connecting hardware fitting extends into the cable elbow-shaped terminal plug, and the extending end of the connecting hardware fitting is connected with the other side of the induction sheet at intervals in an insulating manner through an insulating layer; the shell part of the signal output joint is fixedly connected with the connecting hardware fitting to form an equipotential, and the conductor part of the signal output joint is electrically connected with the induction sheet; one end of the measuring resistor is electrically connected with the sensing sheet, and the other end of the measuring resistor is electrically connected with the connecting hardware fitting, so that the voltage output by the conductor part of the signal output joint is the voltage on the measuring resistor;
the signal acquisition processing unit is electrically connected with the conductor part of the signal output connector through a signal cable, and the signal acquisition processing unit acquires and measures the voltage on the resistor through the signal output connector and then calculates the voltage.
The measuring resistor is an adjustable resistance module consisting of a solid-state change-over switch and a plurality of parallel resistors, and different resistors can be connected through the solid-state change-over switch in a switching mode. The signal acquisition processing unit calculates the voltage generated by the high-voltage conductor of the cable in the elbow-shaped terminal of the cable based on the voltage of the measuring resistor.
A voltage measuring method for a cable elbow terminal is characterized in that based on the voltage of a measuring resistor and the resistance value of the measuring resistor, and combined with the equivalent capacitance between a thread structure and an induction sheet, the equivalent capacitance between the induction sheet and a connecting hardware fitting, the capacitance of a signal cable and the input resistance value of a signal acquisition processing unit in electrical parameters formed by the structural relation of a voltage integrated measuring device, the partial discharge voltage, or the transient and stable state voltage, or the fault voltage generated by a high-voltage conductor of a cable in the cable elbow terminal is calculated.
According to the invention, the sensing piece is embedded in the plug of the cable elbow terminal, the voltage generated by the high-voltage cable conductor in the cable elbow terminal is transmitted to the threaded structure in the plug through the bolt, and is sensed by the sensing piece through the cable elbow terminal between the sensing piece and the threaded structure, the current generated when the sensing piece senses the voltage is transmitted to the measuring resistor, so that the voltage is formed on the measuring resistor, the voltage of the measuring resistor is output outwards through the signal output connector, and the voltage on the measuring resistor is acquired by the signal acquisition processing unit. The signal acquisition processing unit is combined with a series of electrical parameters formed by the structural relationship of the local discharge and the transient and steady state voltage on-line measuring device of the high-voltage cable elbow terminal, and based on the voltage and the resistance value of the measuring resistor, the local discharge and the transient and steady state voltage generated by the high-voltage conductor of the cable in the cable elbow terminal can be obtained by inversion calculation,
therefore, the invention is directly transformed on the original cable elbow terminal structure, does not change the original structure of the cable elbow terminal basically, does not influence the normal work of the cable elbow terminal, and can accurately monitor the voltage generated by the high-voltage conductor of the cable in the cable elbow terminal on line in real time, thereby providing reliable measurement data support for judging the working state of the cable elbow terminal and various electrical potential safety hazards and being beneficial to finding and processing problems as soon as possible.
The cable elbow terminal is low in modification cost and convenient to modify, is suitable for being integrated in the cable elbow terminal, and can accurately position the fault of the cable elbow terminal, so that the safe and stable operation of the cable elbow terminal is ensured.
Drawings
Fig. 1 is a schematic view of a prior art cable elbow termination configuration.
Fig. 2 is a schematic view of the assembly of the present invention with a cable elbow termination plug.
Fig. 3 is a schematic structural diagram of the present invention.
Fig. 4 is a schematic circuit diagram of the measuring resistor of the present invention as an adjustable resistance module.
Fig. 5 is an equivalent circuit diagram of the present invention.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
As shown in fig. 2 and fig. 3, the device 10 for measuring partial discharge and transient steady-state voltage of the elbow-shaped terminal of the high-voltage cable according to the present invention includes a signal sensing unit and a signal acquisition and processing unit.
The signal sensing unit comprises an induction sheet 14, a connecting hardware fitting 16, a signal output connector and a measuring resistor 17. The induction sheet 14 is a voltage induction sheet, the induction sheet 14 is pre-embedded in the plug 9 of the elbow-shaped terminal of the cable, and the left side surface of the induction sheet 14 serves as an induction surface facing the threaded structure 8 in the plug 9. The left end of the link fitting 16 is embedded into the plug 9 from the right end of the plug 9, the left end of the link fitting 16 is connected with the induction sheets 14 at intervals in an insulating mode through an insulating layer 15 made of a layer of epoxy resin material, the insulating layer 15 plays a role in insulating and isolating the induction sheets 14 and the link fitting 16, and the right end of the link fitting 16 is located outside the right end of the plug 9. A through hole is dug in the insulating layer 15, the measuring resistor 17 is pre-embedded in the through hole, and one end of the measuring resistor 17 is electrically connected with the sensing piece 14, and the other end is electrically connected with the connecting hardware fitting 16.
The signal output connects and adopts BNC to connect, is equipped with the hole in to link fitting 16 from link fitting 16 right-hand members, and BNC connects and locates downtheholely. The outer shell part 18 of the BNC joint is electrically and fixedly connected with the inner wall of the hole of the connecting fitting 16, and the connecting fitting 16 is electrically grounded, so that the outer shell part 18 of the BNC joint and the connecting fitting 16 form equipotential grounding. The left end of the central conductor part 19 of the BNC connector is electrically connected with a metal conductor, the metal conductor penetrates through the insulating layer 15 and then is electrically connected with the center of the induction sheet 14, and the right end of the whole BNC connector penetrates out of the right end of the connecting hardware fitting 16.
The signal acquisition and processing unit is a voltage detector 12 with a data processing function, and the voltage detector 12 is used for acquiring and calculating the voltage of the measuring resistor 17. The signal input of the voltage detector 12 is electrically connected to the central conductor section 19 of the BNC connector via the signal cable 11, whereby the voltage detector 12 can pick up the voltage of the measuring resistor 17. The signal output end of the voltage detector 12 is electrically connected with the voltage display 13, and the measurement result and the calculation result of the voltage detector 12 are displayed by the voltage display 13.
The measuring resistor 17 of the present invention may be a resistor with a fixed resistance, and the resistance of the resistor is selected to be 50 Ω -2M Ω. A resistance having an appropriate resistance value may be selected as the measuring resistor 17 according to the kind of the voltage to be actually measured.
As shown in fig. 4, the measuring resistor 17 of the present invention may further include a resistor parallel structure formed by connecting a plurality of resistors in parallel, and a solid-state switch 20, where the resistor parallel structure is connected in series with the solid-state switch 20 to form a series branch, and one end of the series branch is electrically connected to the sensing pad 14, and the other end of the series branch is electrically connected to the connecting fitting 16. The solid state change-over switch 20 adopts an IGBT change-over switch, the IGBT change-over switch is connected with an external controller, the IGBT change-over switch is controlled by the outside, the solid state change-over switch 20 is connected with any one resistor in the resistor parallel structure in a switching mode to form the resistance value of the measuring resistor, the resistance values of all resistors in the resistor parallel structure are selected within 50 omega-2M omega respectively, and resistors with proper resistance values can be selected through the solid state change-over switch according to the actually measured voltage types.
In the cable elbow terminal voltage measuring method based on the high-voltage cable elbow terminal partial discharge and transient steady state voltage online measuring device, the voltage detector 12 calculates and obtains partial discharge voltage, transient steady state voltage or fault voltage generated by a cable high-voltage conductor in the cable elbow terminal based on the voltage of the measuring resistor 17, the resistance value of the measuring resistor 17, equivalent capacitance between the thread structure 8 and the induction sheet 14, equivalent capacitance between the induction sheet 14 and the connecting hardware fitting 16, capacitance of the signal cable 11 and the input resistance value of the voltage detector 12 in electrical parameters formed by combining structural relations.
Fig. 5 is an equivalent circuit diagram of the present invention for measuring partial discharge voltage, transient steady state voltage (including power frequency voltage, lightning impulse voltage, electrical fast transient pulse, etc.), or fault voltage of the elbow terminal of the cable. u. of s For applying a voltage to a high-voltage conductor of a cable in an elbow-shaped termination of the cable, C 1 Equivalent capacitance, C, of the thread structure 8 to the induction plate 14 g Is the equivalent capacitance, C, between the inductive piece 14 and the connecting fitting 16 c Capacitance of signal cables for transmitting measuring signals, C o Is the input capacitance, R, of the voltage detector 12 m Is the resistance value, R, of the measuring resistor 17 between the sensing piece 14 and the connecting fitting 16 o Is the input resistance of the voltage detector 12. In an equivalent circuit, C 1 High-voltage arm capacitance, C, being a voltage-dividing circuit g 、C c 、C o 、R m And R o The impedance Z measured together forming a low-voltage arm m . Measuring impedance Z with a voltage meter m The voltage at both ends, and then the voltage u on the high-voltage conductor of the cable is calculated s . By the method, the partial discharge voltage of the cable elbow terminal, the power frequency voltage, the lightning impulse voltage, the electric fast transient pulse and other transient and steady-state voltages can be calculated.
When the power frequency voltage is measured, the calculation formula is as follows:
when measuring partial discharge voltage, lightning impulse voltage, electric fast transient pulse voltage and fault voltage, the calculation formula is as follows:
by the method, the partial discharge voltage of the cable elbow terminal, the transient and steady-state voltages such as power frequency voltage, lightning impulse voltage, electric fast transient pulse and the like, and the fault voltage can be obtained through calculation.
Specifically, when the resistance value of the measuring resistor 17 is 10k Ω -2M Ω, the measuring resistor is used for measuring power frequency voltage; when the resistance value of the measuring resistor 17 is selected to be 50-10 k omega, the measuring resistor is used for measuring lightning impulse voltage and electric fast transient pulse; when the resistance value of the measuring resistor 17 is 200-2M omega, the measuring resistor is used for measuring fault voltage; the resistance value of the measuring resistor 17 is chosen to be 50 omega-10 k omega for measuring the partial discharge voltage.
The embodiments of the present invention are described only for the preferred embodiments of the present invention, and not for the limitation of the concept and scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the design concept of the present invention shall fall into the protection scope of the present invention, and the technical content of the present invention which is claimed is fully set forth in the claims.
Claims (6)
1. High tension cable elbow terminal partial discharge and transient steady state voltage on-line measuring device, cable elbow terminal is provided with the end cap, the end cap is connected with the bolt through helicitic texture, the bolt is connected with the cable high voltage conductor electricity in the cable elbow terminal, its characterized in that: including signal sensing unit and signal acquisition processing unit, wherein:
the signal sensing unit comprises a connecting hardware fitting, an induction sheet, a measuring resistor and a signal output joint; the induction sheet is pre-embedded in the plug of the cable elbow terminal, one surface of the induction sheet serves as an induction surface facing the threaded structure in the plug of the cable elbow terminal, and the induction sheet serves as a pre-embedded electrode and is used for sensing the voltage of a part of the cable elbow terminal between the threaded structure and the induction sheet; one end of the connecting hardware fitting extends into the cable elbow-shaped terminal plug, and the extending end of the connecting hardware fitting is connected with the other side of the induction sheet at intervals in an insulating manner through an insulating layer; the shell part of the signal output joint is fixedly connected with a connecting hardware fitting to form equipotential, and the conductor part of the signal output joint is electrically connected with the induction sheet; one end of the measuring resistor is electrically connected with the sensing sheet, the other end of the measuring resistor is electrically connected with the connecting fitting, the voltage output by the conductor part of the signal output joint is the voltage on the measuring resistor, the measuring resistor is an adjustable resistance module, the adjustable resistance module comprises a resistance parallel structure formed by connecting a plurality of resistors in parallel and a solid-state change-over switch controlled by the outside, the solid-state change-over switch is connected with the resistance parallel structure in series to form a series branch, one end of the series branch is electrically connected with the sensing sheet, the other end of the series branch is electrically connected with the connecting fitting, and different resistors in the resistance parallel structure are switched and connected by the solid-state change-over switch; when the resistance value of the measuring resistor is 10k omega-2M omega, the measuring resistor is used for measuring power frequency voltage; when the resistance value of the measuring resistor is selected to be 50-10 k omega, the measuring resistor is used for measuring lightning impulse voltage and electric fast transient pulse; when the resistance value of the measuring resistor is 200-2M omega, the measuring resistor is used for measuring fault voltage; when the resistance value of the measuring resistor is 50-10 k omega, the measuring resistor is used for measuring partial discharge voltage;
the signal acquisition processing unit is electrically connected with the conductor part of the signal output connector through a signal cable, and the signal acquisition processing unit acquires and measures the voltage on the resistor through the signal output connector and then calculates the voltage.
2. The high voltage cable elbow termination partial discharge and transient steady state voltage on-line measurement device of claim 1, wherein: a hole is formed in the insulating layer between the connecting hardware fitting and the induction sheet, and the measuring resistor is embedded in the hole.
3. The high voltage cable elbow termination partial discharge and transient steady state voltage on-line measurement device of claim 1, wherein: the insulating layer is made of epoxy resin materials.
4. The on-line measurement device for partial discharge and transient steady state voltage of the elbow-shaped terminal of the high-voltage cable according to claim 1, wherein: the connecting fitting is electrically grounded, so that the shell part of the signal output joint and the connecting fitting form equipotential grounding.
5. The high voltage cable elbow termination partial discharge and transient steady state voltage on-line measurement device of claim 1, wherein: the signal output connector is a BNC connector.
6. A cable elbow terminal voltage measuring method based on the voltage on-line measuring device of any one of claims 1-5, characterized in that: based on the voltage of the measuring resistor and the resistance value of the measuring resistor, the partial discharge voltage, the transient and steady state voltage or the fault voltage of the elbow-shaped terminal of the cable is calculated by combining the equivalent capacitance between the thread structure and the induction sheet, the equivalent capacitance between the induction sheet and the connecting hardware fitting, the capacitance of the signal cable and the input resistance value of the signal acquisition processing unit.
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| CN202111466667.7A CN114200262B (en) | 2021-12-03 | 2021-12-03 | High-voltage cable elbow terminal partial discharge and transient steady state voltage on-line measuring device |
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| 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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| US20110074389A1 (en) * | 2009-09-30 | 2011-03-31 | Tektronix, Inc. | Signal Acquisition System Having Probe Cable Termination in a Signal Processing Instrument |
| EP3499253A1 (en) * | 2017-12-18 | 2019-06-19 | Norddeutsche Seekabelwerke GmbH | Marine cable section and method for identifying a partial electrical discharge in a marine cable section |
| CN209764997U (en) * | 2019-03-29 | 2019-12-10 | 云南电网有限责任公司电力科学研究院 | transient grounding voltage coupling device for cable body insulation partial discharge |
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| JP2002022790A (en) * | 2000-07-04 | 2002-01-23 | Hitachi Ltd | Partial discharge detecting device for gas insulating equipment |
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| CN214150840U (en) * | 2020-12-08 | 2021-09-07 | 国网陕西省电力公司西安供电公司 | Capacitive voltage sensor sampling module and measuring module for ring main unit |
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| US20110074389A1 (en) * | 2009-09-30 | 2011-03-31 | Tektronix, Inc. | Signal Acquisition System Having Probe Cable Termination in a Signal Processing Instrument |
| EP3499253A1 (en) * | 2017-12-18 | 2019-06-19 | Norddeutsche Seekabelwerke GmbH | Marine cable section and method for identifying a partial electrical discharge in a marine cable section |
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