CN112034235B - Device and method suitable for power frequency voltage measurement of cable T-shaped connector - Google Patents
Device and method suitable for power frequency voltage measurement of cable T-shaped connector Download PDFInfo
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- CN112034235B CN112034235B CN202010927763.6A CN202010927763A CN112034235B CN 112034235 B CN112034235 B CN 112034235B CN 202010927763 A CN202010927763 A CN 202010927763A CN 112034235 B CN112034235 B CN 112034235B
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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
- G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
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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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Abstract
The invention relates to a device and a method suitable for measuring power frequency voltage of a cable T-shaped connector. The measuring device includes: the plug measurement module and the voltage determination module; the plug measurement module comprises a measurement resistor and a metal cavity; cutting a metal block on the inner cavity of the metal cavity, and sticking the metal block at the cutting position to serve as a metal sensing piece; the voltage determining module is used for determining the power frequency voltage of the cable joint according to the voltage signals at two ends of the measuring resistor. According to the measuring device and the measuring method, the power frequency voltage of the measured cable connector can be determined in real time by acquiring the voltage signal of the measuring resistor, so that the problems that a large amount of manpower and material resources are required to be consumed and the cable connector with the defect cannot be found in time in the prior art can be solved.
Description
Technical Field
The invention relates to the technical field of power frequency voltage measurement, in particular to a device and a method suitable for power frequency voltage measurement of a cable T-shaped connector.
Background
With the vigorous development of electric power construction in China, the high-low voltage lines built in cities, industrial and mining and national defense gradually realize cabling, and the electric power cable lines are rapidly increased. Therefore, ensuring safe operation of the power cable and timely and correctly removing faults, and quickly recovering power supply are important tasks. Cable connectors, which serve as terminal equipment, are connected between the cable and the electrical insulation of transformers, switches and other equipment, and are an important component of the power cable. Meanwhile, the metal sheath of the body is stripped at the cable fracture, so that the electric field distribution inside the cable T-shaped head becomes very complex, breakdown faults occur at the same time, and the safety and stability of the power cable are greatly influenced. Then it becomes necessary to accurately measure the running state of the cable joint, find the cable joint with bad running state in time, and process it.
At present, no automatic technology capable of accurately measuring the voltage of the cable connector exists. In the existing engineering measurement process, the detection of the running state of the cable joint is still to manually perform timing and fixed-point measurement.
Therefore, the measurement method in the prior art not only needs to consume a great deal of manpower and material resources, but also can not find the cable joint with defects in time.
Disclosure of Invention
The invention aims to provide a device and a method suitable for measuring power frequency voltage of a cable T-shaped connector, so that the cable connector can be measured timely and accurately while saving manpower and material resources.
In order to achieve the above object, the present invention provides the following solutions:
a device suitable for power frequency voltage measurement of a cable T-joint, comprising: the plug measurement module and the voltage determination module;
the plug measuring module is arranged at one end of the cable joint; the plug measurement module comprises a measurement resistor and a metal cavity;
cutting a metal block on the inner cavity of the metal cavity, and pasting the metal block at a cutting position to serve as a metal induction piece; the measuring resistor is arranged in the metal cavity, one end of the measuring resistor is connected with the wall of the metal cavity, and the other end of the measuring resistor is connected with the metal sensing piece; the voltage determining module is connected with the measuring resistor and is used for determining the power frequency voltage of the cable joint according to voltage signals at two ends of the measuring resistor.
Preferably, the plug measurement module further includes: a plug insulating layer and a plug conductive layer;
the plug conducting layer is clamped at one end of the cable conductor; the plug insulating layer is a filling main body of the plug measuring module and is used for wrapping the plug conducting layer and the metal cavity.
Preferably, the plug measurement module further comprises a plug mounting hole;
the plug mounting hole penetrates through the plug insulating layer and the metal cavity, and is positioned on the cavity of the metal cavity opposite to the metal induction piece.
Preferably, the measuring device further comprises a coaxial cable;
the coaxial cable passes through the plug mounting hole, one end of the coaxial cable is connected with two ends of the measuring resistor, and the other end of the coaxial cable is connected with the voltage determining module.
Preferably, the material of the plug conductive layer and the material of the metal cavity are both conductive metal materials.
Preferably, the plug measurement module further comprises an insulating film;
the insulating film is attached to the side wall of the metal sensing piece.
Preferably, the measured resistance is a resistance with a resistance value of 2kΩ -10mΩ.
Preferably, the voltage determining module includes: a voltage calculation unit and a display unit;
the voltage calculation unit is respectively connected with the measuring resistor and the display unit; the voltage calculation unit is used for determining the power frequency voltage according to voltage signals at two ends of the measuring resistor; the display unit is used for displaying the power frequency voltage.
Preferably, the thickness of the cavity of the metal cavity is 2-4 mm.
A method for power frequency voltage measurement of a cable T-joint, comprising:
constructing an equivalent circuit model according to the device suitable for measuring the power frequency voltage of the cable T-shaped connector; the equivalent capacitance between the plug conducting layer and the metal induction sheet is used as a first capacitance; taking the gap capacitance between the metal cavity and the metal induction sheet as a second capacitance;
acquiring a capacitance value of the first capacitor, a capacitance value of the second capacitor, a resistance value of the measuring resistor and voltage values at two ends of the measuring resistor according to the equivalent circuit model;
according to the capacitance value of the first capacitor, the capacitance value of the second capacitor, the resistance value of the measuring resistor and the voltage values of two ends of the measuring resistor, adopting a formula
Determining a voltage vector for the cable conductor;
determining the power frequency voltage of the cable joint according to the voltage vector of the cable conductor;
in the method, in the process of the invention,
is the voltage vector of the cable conductor, C 1 C is the capacitance value of the first capacitor 2 The capacitance value of the second capacitor, R is the resistance value of the measuring resistor, < >>
In order to measure the voltage values at two ends of the resistor, omega is the power frequency voltage angular frequency, and j is an imaginary unit.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the device and the method for measuring the power frequency voltage of the cable T-shaped connector can determine and obtain the power frequency voltage of the measured cable connector in real time by acquiring the voltage signal of the measuring resistor, so that the problems that a large amount of manpower and material resources are required to be consumed and the cable connector with defects cannot be found in time in the prior art can be solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a device for measuring power frequency voltage of a cable T-shaped connector;
fig. 2 is a schematic structural diagram of a plug measurement module according to an embodiment of the present invention;
FIG. 3 is a flow chart of a method for power frequency voltage measurement of a cable T-joint provided by the invention;
fig. 4 is an equivalent schematic diagram of a circuit constructed according to the provided measuring device in the embodiment of the invention;
fig. 5 is a schematic diagram of an equivalent circuit constructed according to the provided measuring device in an embodiment of the present invention.
Symbol description:
the device comprises a 1 plug measurement module, a 1-1 plug insulating layer, a 1-2 plug conducting layer, a 1-3 metal cavity, a 1-4 metal induction piece, a 1-5 plug mounting hole, a 1-6 insulating film, a 1-7 measurement resistor, a 2 coaxial cable, a 3 voltage determination module, a 4 cable conductor and a 5 cable connector.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a device and a method suitable for measuring power frequency voltage of a cable T-shaped connector, so that the cable connector can be measured timely and accurately while saving manpower and material resources.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Fig. 1 is a schematic structural diagram of a measuring device suitable for power frequency voltage of a cable connector 5 according to the present invention, and fig. 2 is a schematic structural diagram of a plug measuring module 1 according to an embodiment of the present invention. As shown in fig. 1 and 2, a measuring device suitable for power frequency voltage of a cable joint 5 includes: a plug measurement module 1 and a voltage determination module 3.
The plug measurement module 1 is mounted at one end of a cable joint 5. The plug measuring module 1 comprises a measuring resistor 1-7 and a metal cavity 1-3. The wall thickness of the metal cavity 1-3 in the present invention is preferably 2 to 4mm. The measuring resistances 1-7 are resistances with values of preferably 2k omega-10M omega.
A metal block is cut on the inner cavity of the metal cavity 1-3, and the metal block is stuck at the cutting position to be used as the metal sensing piece 1-4. The measuring resistor 1-7 is arranged in the metal cavity 1-3, one end of the measuring resistor 1-7 is connected with the wall of the metal cavity 1-3, and the other end of the measuring resistor 1-7 is connected with the metal sensing piece 1-4. The voltage determining module 3 is connected with the measuring resistors 1-7, and the voltage determining module 3 is used for determining the power frequency voltage of the cable connector 5 according to the voltage signals at two ends of the measuring resistors 1-7.
As shown in fig. 2, the plug measurement module 1 further preferably includes: plug insulation layer 1-1 and plug conductive layer 1-2.
The plug conductive layer 1-2 is clamped at one end of the cable conductor 4. The plug insulating layer 1-1 is a filling body of the plug measuring module 1 and is used for wrapping the plug conducting layer 1-2 and the metal cavity 1-3.
In the present invention, the plug insulating layer 1-1 is an insulating body of a plug, and is made of epoxy resin for easy installation and disassembly. A threaded structure is dug at one end of the plug insulating layer 1-1 to fix the plug conductive layer 1-2. The plug conductive layer 1-2 further secures the cable conductor 4.
Wherein, the material of the plug conductive layer 1-2 and the material of the metal cavity 1-3 are preferably conductive metal materials.
Preferably, the plug measurement module 1 further comprises plug mounting holes 1-5.
The plug mounting hole 1-5 penetrates through the plug insulating layer 1-1 and the metal cavity 1-3, and the plug mounting hole 1-5 is positioned on a cavity of the metal cavity 1-3 opposite to the metal sensing piece 1-4.
The bulkhead mounting holes 1-5 may also be of a mounting hole configuration in existing bulkhead, which is provided for the purpose of providing a contact surface for a torque wrench to facilitate securing the cable conductor 4.
Preferably, the measuring device further comprises a coaxial cable 2.
The coaxial cable 2 passes through the plug mounting hole 1-5, one end of the coaxial cable 2 is connected with two ends of the measuring resistor 1-7, and the other end of the coaxial cable 2 is connected with the voltage determining module 3.
Preferably, the plug-measuring module 1 further comprises an insulating film 1-6.
An insulating film 1-6 is attached to the side walls of the metal inductive piece 1-4. The periphery of the metal induction piece 1-4 is coated with an insulating film 1-6 and then stuck at the notch of the wall of the metal cavity 1-3. The insulating film 1-6 is made of epoxy resin and is used for separating the metal induction piece 1-4 from the wall of the metal cavity 1-3.
Preferably, the voltage determination module 3 includes: a voltage calculation unit and a display unit.
The voltage calculation unit is respectively connected with the measuring resistors 1-7 and the display unit. The voltage calculation unit is used for determining the power frequency voltage according to the voltage signals at the two ends of the measuring resistors 1-7. The display unit is used for displaying the power frequency voltage.
Aiming at the measuring device provided by the invention, the invention also correspondingly provides a method suitable for measuring the power frequency voltage of the cable T-shaped connector. As shown in fig. 3, the measurement method includes:
step 100: and constructing an equivalent circuit model according to the device suitable for measuring the power frequency voltage of the cable T-shaped connector. As shown in fig. 4, the plug conductive layer is connected to the cable conductor and is equipotential with the cable conductor. And taking the equivalent capacitance between the plug conducting layer and the metal induction sheet as a first capacitance. And taking the gap capacitance between the metal cavity and the metal induction sheet as a second capacitance. The equivalent capacitance between the plug conductive layer and the metal cavity is used as a third capacitance (electricThe capacitance value is C 3 )。
Step 200: and acquiring the capacitance value of the first capacitor, the capacitance value of the second capacitor, the resistance value of the measuring resistor and the voltage values at two ends of the measuring resistor according to the equivalent circuit model.
Step 300: according to the capacitance value of the first capacitor, the capacitance value of the second capacitor, the resistance value of the measuring resistor and the voltage values at two ends of the measuring resistor, adopting a formula
A voltage phasor for the cable conductor is determined.
Step 400: and determining the power frequency voltage of the cable joint according to the voltage phasors of the cable conductors.
In the method, in the process of the invention,
as voltage phasors for cable conductors, C 1 C is the capacitance value of the first capacitor 2 The capacitance value of the second capacitor, R is the resistance value of the measuring resistor, < >>
In order to measure the voltage phasors at two ends of the resistor, omega is the power frequency voltage angular frequency, and j is an imaginary unit.
The specific process for implementing the measuring method is as follows:
the potential of the plug conducting layer is regarded as the voltage source of the circuit, the other parts are regarded as the external circuit, the Thevenin equivalent is carried out in the power supply, the third capacitor is ignored, and the equivalent circuit of the measuring device under the power frequency is obtained, as shown in figure 5, in the figure
Is an equivalent supply voltage phasor, i.e. a cable conductor voltage phasor, +.>
Is the voltage phasor across the resistor.
From the equivalent circuit, the voltage phasors at the two ends of the resistor are measured
Equivalent to Thevenin, i.e. cable conductor voltage phasors +.>
The relation between the two is:
the power frequency voltage of the cable connector can be obtained based on the relation.
Based on the technical scheme provided by the invention, compared with the prior art, the invention has the following advantages:
1. the cable connector plug can be directly modified on the plug of the cable connector without changing the original structure.
2. The device has the characteristics of small volume, wide application range and no restriction of geographical environment.
3. The cable connector with poor running state can be found in time, faults do not need to be generated, operators can process the cable connector, and safe and stable running of the whole cable system is guaranteed.
In addition, the above solution provided in the present invention is preferably suitable for a cable T-type connector, so in the specific embodiment of the present invention, the cable T-type connector is taken as an example for illustration, but in the practical application process, those skilled in the art can also apply to other types of cable connectors.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (8)
1. Device suitable for cable T type connects power frequency voltage measurement, characterized in that includes: the plug measurement module and the voltage determination module;
the plug measuring module is arranged at one end of the cable joint; the plug measurement module comprises a measurement resistor and a metal cavity;
cutting a metal block on the inner cavity of the metal cavity, and pasting the metal block at a cutting position to serve as a metal induction piece; the measuring resistor is arranged in the metal cavity, one end of the measuring resistor is connected with the wall of the metal cavity, and the other end of the measuring resistor is connected with the metal sensing piece; the voltage determining module is connected with the measuring resistor and is used for determining the power frequency voltage of the cable joint according to voltage signals at two ends of the measuring resistor;
the plug measurement module further comprises: a plug insulating layer and a plug conductive layer;
the plug conducting layer is clamped at one end of the cable conductor; the plug insulating layer is a filling main body of the plug measuring module and is used for wrapping the plug conducting layer and the metal cavity;
the process for determining the power frequency voltage of the cable joint comprises the following steps:
constructing an equivalent circuit model; the plug conducting layer is connected with the cable conductor and is equipotential with the cable conductor; taking an equivalent capacitance between the plug conducting layer and the metal induction sheet as a first capacitance; taking the gap capacitance between the metal cavity and the metal induction sheet as a second capacitance;
acquiring a capacitance value of a first capacitor, a capacitance value of a second capacitor, a resistance value of a measuring resistor and voltage values at two ends of the measuring resistor according to the constructed equivalent circuit model;
according to the capacitance value of the first capacitor, the capacitance value of the second capacitor, the resistance value of the measuring resistor and the voltage values of two ends of the measuring resistor, adopting a formula
Determining a voltage phasor for the cable conductor;
determining the power frequency voltage of the cable joint according to the voltage phasors of the cable conductors;
in the method, in the process of the invention,
as voltage phasors for cable conductors, C 1 C is the capacitance value of the first capacitor 2 The capacitance value of the second capacitor, R is the resistance value of the measuring resistor, < >>
In order to measure the voltage phasors at two ends of the resistor, omega is the power frequency voltage angular frequency, and j is an imaginary unit.
2. The device for power frequency voltage measurement of a cable T-joint of claim 1, wherein the plug measurement module further comprises a plug mounting hole;
the plug mounting hole penetrates through the plug insulating layer and the metal cavity, and is positioned on the cavity of the metal cavity opposite to the metal induction piece.
3. The apparatus for power frequency voltage measurement of a cable T-joint of claim 2, wherein the measuring apparatus further comprises a coaxial cable;
the coaxial cable passes through the plug mounting hole, one end of the coaxial cable is connected with two ends of the measuring resistor, and the other end of the coaxial cable is connected with the voltage determining module.
4. The device for measuring power frequency voltage of a cable T-joint according to claim 1, wherein the material of the plug conductive layer and the material of the metal cavity are both conductive metal materials.
5. The device for power frequency voltage measurement of a cable T-joint of claim 1, wherein the plug measurement module further comprises an insulating film;
the insulating film is attached to the side wall of the metal sensing piece.
6. The device for measuring power frequency voltage of cable T-joint according to claim 1, wherein the measuring resistor is a resistor with a resistance value of 2kΩ -10mΩ.
7. The apparatus for power frequency voltage measurement of a cable T-joint of claim 1, wherein the voltage determination module comprises: a voltage calculation unit and a display unit;
the voltage calculation unit is respectively connected with the measuring resistor and the display unit; the voltage calculation unit is used for determining the power frequency voltage according to voltage signals at two ends of the measuring resistor; the display unit is used for displaying the power frequency voltage.
8. The device for measuring power frequency voltage of cable T-joint according to claim 1, wherein the thickness of the cavity of the metal cavity is 2-4 mm.
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| CN112034236B (en) * | 2020-09-07 | 2021-08-03 | 华北电力大学 | Online monitoring device and method for transient voltage of cable elbow terminal |
| CN112946343B (en) * | 2021-01-29 | 2022-12-02 | 华北电力大学 | Overhead line power frequency voltage measuring device and measuring method |
| CN114113949B (en) * | 2021-12-03 | 2024-07-30 | 广东电网有限责任公司广州供电局 | Device for measuring partial discharge |
| CN114200262B (en) * | 2021-12-03 | 2023-03-31 | 华北电力大学 | High-voltage cable elbow terminal partial discharge and transient steady state voltage on-line measuring device |
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