CN112034236B - Online monitoring device and method for transient voltage of cable elbow terminal - Google Patents
Online monitoring device and method for transient voltage of cable elbow terminal Download PDFInfo
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- CN112034236B CN112034236B CN202010927810.7A CN202010927810A CN112034236B CN 112034236 B CN112034236 B CN 112034236B CN 202010927810 A CN202010927810 A CN 202010927810A CN 112034236 B CN112034236 B CN 112034236B
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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
- G01R19/0046—Arrangements for measuring currents or voltages or for indicating presence or sign thereof characterised by a specific application or detail not covered by any other subgroup of G01R19/00
- G01R19/0053—Noise discrimination; Analog sampling; Measuring transients
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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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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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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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses an on-line monitoring device and method for transient voltage of a cable elbow terminal. This cable elbow terminal transient state voltage on-line monitoring device includes: the device comprises a plug insulating structure, a thread structure arranged at one end of the plug insulating structure and a measurement transmission device arranged at the other end of the plug insulating structure; the measurement transmission device comprises a pre-buried electrode, an adapter, a solid circular table and a measurement resistor; the embedded electrode is a round table-like structure with a round table-shaped hollow structure inside and an opening on the upper bottom surface; the side surface of the embedded electrode is an outward convex arc and is grounded, and the lower bottom surface is an downward convex arc; a solid circular truncated cone is arranged inside the embedded electrode; the solid round table is isolated from the side surface of the embedded electrode to form an isolated space; a through hole is formed in the lower bottom surface of the embedded electrode corresponding to the isolation space; filling insulating materials in the through hole; one end of the measuring resistor is connected with the lower bottom surface of one side of the through hole, and the other end of the measuring resistor is connected with the lower bottom surface of the other side of the through hole. The invention can improve the accuracy of the voltage measurement of the cable elbow-shaped head.
Description
Technical Field
The invention relates to the field of voltage measurement of cable elbow heads, in particular to an online monitoring device and method for transient voltage of a cable elbow terminal.
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. During operation of the cable system, transient voltages are often generated, which mainly include lightning overvoltage and operation overvoltage, and compared with a cable body, the cable elbow is more complex in structure and is more vulnerable to the transient voltages. And the manufacturing process and the field installation quality also cause that the inside of the cable elbow head can have defects and partial discharge can occur. Transient voltage and partial discharge can accelerate the insulation degradation of the elbow head of the cable, and even cause insulation breakdown when the cable is serious. Therefore, transient voltage and partial discharge are important factors threatening the safety of the elbow-shaped head of the cable, and need to be measured and monitored. The transient voltage signal and the discharge signal of the cable elbow head are accurately measured, a basis can be provided for accident analysis of the cable elbow head, and optimization of design of the cable elbow head is facilitated. Although the measurement of the voltage of the elbow-shaped head of the cable has important significance, the accurate measurement of the voltage of the elbow-shaped head of the cable is not realized at present.
Disclosure of Invention
Therefore, there is a need for an online monitoring device and method for transient voltage of an elbow terminal of a cable, so as to improve the accuracy of voltage measurement of the elbow head of the cable.
In order to achieve the purpose, the invention provides the following scheme:
an on-line monitoring device for transient voltage of a cable elbow terminal comprises: the device comprises a threaded structure, a plug insulation structure and a measurement transmission device; the threaded structure is arranged at one end of the plug insulating structure; the measuring and transmitting device is arranged at the other end of the plug insulating structure; the threaded structure is used for connecting a stud bolt of a cable elbow-shaped head;
the measurement transmission device comprises a pre-buried electrode, an adapter, a solid circular table and a measurement resistor; the embedded electrode is a truncated cone-like body with a truncated cone-shaped hollow structure inside and an opening on the upper bottom surface; the side surface of the embedded electrode is an outward convex arc; the lower bottom surface of the embedded electrode is a downward convex arc; the side surface of the embedded electrode is grounded; the solid round table is arranged inside the embedded electrode; the solid round table is contacted with the lower bottom surface of the embedded electrode; the solid round table is isolated from the side surface of the embedded electrode to form an isolation space; a through hole is formed in the lower bottom surface of the embedded electrode corresponding to the isolation space; filling an insulating material in the through hole; one end of the measuring resistor is connected with the lower bottom surface of one side of the through hole; the other end of the measuring resistor is connected with the lower bottom surface of the other side of the through hole; the embedded electrode and the solid circular truncated cone are connected with a cable through the adapter.
Optionally, the adapter comprises an adapter housing and an adapter core; the side surface of the embedded electrode is connected with the shell of the cable through the adapter shell; the solid circular truncated cone is connected with the inner core of the cable through the adapter wire core.
Optionally, the cable elbow terminal transient voltage online monitoring device further includes a voltage meter; the pressure measuring device is connected with the measurement transmission device through the cable; the voltage detector is used for measuring the voltage at two ends of the measuring resistor.
Optionally, the cable elbow terminal transient voltage online monitoring device further includes a voltage display connected to the voltage meter; the voltage display is used for displaying the voltage at two ends of the measuring resistor.
Optionally, the resistance value of the measuring resistor is 50 Ω -10M Ω.
Optionally, the embedded electrode and the solid circular truncated cone are made of metal materials.
Optionally, the insulating material is epoxy resin.
The invention also provides an online monitoring method for the transient voltage of the cable elbow terminal, which is used for the online monitoring device for the transient voltage of the cable elbow terminal; the method comprises the following steps:
acquiring voltages at two ends of a measuring resistor;
calculating the transient voltage of the elbow-shaped terminal of the cable according to the voltage at the two ends of the measuring resistor, the equivalent capacitor and the gap capacitor; the equivalent capacitor is an equivalent capacitor between the thread structure and the lower bottom surface of the embedded electrode; the gap capacitor is a gap capacitor between the side surface of the embedded electrode and the lower bottom surface of the embedded electrode; the cable elbow terminal transient voltage comprises a cable elbow terminal local discharge signal, an electrical fast transient pulse and a lightning pulse.
Optionally, the calculating the transient voltage of the elbow terminal of the cable by the voltage at the two ends of the measuring resistor, the equivalent capacitance and the gap capacitance specifically includes:
wherein u issFor cable elbow termination transient voltages, C1Is an equivalent capacitance, C2Is a gap capacitance uoIn order to measure the voltage across the resistor, R is the resistance of the measuring resistor, and t is the time.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides an on-line monitoring device and method for transient voltage of a cable elbow terminal. The measurement transmission device in the cable elbow terminal transient voltage on-line monitoring device comprises a pre-buried electrode, an adapter, a solid round table and a measurement resistor; the embedded electrode is a round table-like structure with a round table-shaped hollow structure inside and an opening on the upper bottom surface; the side surface of the embedded electrode is an outward convex arc, and the lower bottom surface of the embedded electrode is a downward convex arc; grounding the side surface of the embedded electrode; a solid circular truncated cone is arranged inside the embedded electrode; the solid round table is isolated from the side surface of the embedded electrode to form an isolated space; a through hole is formed in the lower bottom surface of the embedded electrode corresponding to the isolation space; filling insulating materials in the through hole; one end of the measuring resistor is connected with the lower bottom surface of one side of the through hole; the other end of the measuring resistor is connected with the lower bottom surface of the other side of the through hole. The grounding wire is reliably grounded, and the embedded electrode is arranged and simultaneously used as a shielding structure, so that the signal transmission process is not easily interfered, the accuracy of measuring the voltage of the elbow-shaped head of the cable can be improved, and the grounding wire has the advantages of small volume, simple structure, low cost and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a schematic view of the overall structure of a cable elbow head according to an embodiment of the present invention;
fig. 2 is a cross-sectional structural diagram of an on-line transient voltage monitoring device for an elbow-shaped terminal of a cable according to an embodiment of the present invention;
fig. 3 is a cross-sectional structural view of a measurement transmission apparatus according to an embodiment of the present invention;
fig. 4 is an equivalent diagram of an online transient voltage monitoring device for an elbow-shaped terminal of a cable according to an embodiment of the present invention;
fig. 5 is an equivalent circuit diagram of an online transient voltage monitoring device for an elbow-shaped terminal of a cable according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, 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 invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The conventional cable elbow is shown in fig. 1, and includes a stud bolt 1, a lug 2, a plug 3, a tail cap 4, a ground wire 5, a cold-shrink body 6, and a cable conductor 7. The lug 2 is pressed on the cable conductor; the cold-shrinkage main body 6 is sleeved on the cable conductor and is in a coaxial structure with the cable conductor; the stud bolt 1 and the plug 3 are used for fixing the joint structure of the lug 2 and the cable conductor on a switch cabinet support; the tail cover 4 is positioned at the end part of the cable elbow-shaped head and covers the plug 3; the ground wire 5 is connected with a system ground wire. The cable elbow terminal transient voltage online monitoring device provided by the embodiment is located inside the plug 3 of the cable elbow head.
Fig. 2 is a cross-sectional structural diagram of an online transient voltage monitoring device for an elbow-shaped terminal of a cable according to an embodiment of the present invention. Referring to fig. 2, the cable elbow terminal transient voltage online monitoring device provided in this embodiment includes: the device comprises a threaded structure 8, a plug insulating structure 9 and a measurement transmission device 10; the threaded structure 8 is arranged at one end of the plug insulating structure 9; the measurement transmission device 10 is arranged at the other end of the plug insulation structure 9; the thread formation 8 is intended for connection to a stud of an elbow-shaped head of a cable.
As an optional implementation manner, the online transient voltage monitoring device for the elbow-shaped terminal of the cable further comprises a voltage meter and a voltage display connected with the voltage meter; the pressure measuring device is connected with the measurement transmission device 10 through the cable; the voltage detector is used for measuring the voltage at two ends of the measuring resistor; the voltage display is used for displaying the voltage at two ends of the measuring resistor.
Fig. 3 is a cross-sectional structural view of the measurement transmission apparatus 10 according to an embodiment of the present invention. Referring to fig. 3, the measurement transmission device 10 includes a pre-buried electrode, an adapter 12, a solid circular table 13 and a measurement resistor 14; the embedded electrode is a truncated cone-like body with a truncated cone-shaped hollow structure inside and an opening on the upper bottom surface; the side surface 11 of the embedded electrode is an outward convex arc; the lower bottom surface 16 of the embedded electrode is a downward convex arc; the side surface 11 of the embedded electrode is grounded through a grounding wire, so that the functions of shielding an external electromagnetic field and connecting are achieved; the solid round table 13 is arranged inside the embedded electrode; the height of the embedded electrodes is the same as that of the solid circular truncated cone 13, namely the upper bottom surfaces of the embedded electrodes are coplanar; the solid round table 13 is in contact with the lower bottom surface 16 of the embedded electrode; the solid round table 13 is isolated from the side surface 11 of the embedded electrode to form an isolation space; a through hole is formed in the lower bottom surface 16 of the embedded electrode corresponding to the isolation space; the through hole is filled with an insulating material 15; one end of the measuring resistor 14 is connected with the lower bottom surface of one side of the through hole; the other end of the measuring resistor 14 is connected with the lower bottom surface of the other side of the through hole; the embedded electrode and the solid circular truncated cone 13 are connected with a cable through the adapter 12.
As an alternative embodiment, the adapter 12 includes an adapter 12 housing and an adapter 12 core; the side surface 11 of the embedded electrode is connected with the shell of the cable through the shell of the adapter 12; the solid circular truncated cone 13 is connected with the inner core of the cable through the wire core of the adapter 12.
In an alternative embodiment, the measuring resistor 14 has a resistance value of 50 Ω to 10M Ω.
As an optional implementation manner, the embedded electrode and the solid circular truncated cone 13 are both made of metal materials.
As an alternative embodiment, the insulating material 15 is epoxy resin.
The measurement principle of the cable elbow terminal transient voltage on-line monitoring device is as follows:
and performing circuit equivalence on the cable elbow-shaped head and the cable elbow-shaped terminal transient voltage online monitoring device, wherein an equivalent diagram is shown in fig. 4, and the threaded structure 8 is connected with a cable conductor through the stud bolt and has the same potential as the cable conductor. Capacitor C1Is equivalent capacitance between the thread structure and the lower bottom surface of the embedded electrode, and capacitance C2Is a gap capacitor between the side surface of the embedded electrode and the lower bottom surface of the embedded electrode, a capacitor C3The equivalent capacitance between the thread structure and the side face of the embedded electrode is obtained.
The potential of the thread structure 8 is regarded as a power supply of the circuit, other parts are regarded as an external circuit, thevenin equivalence is carried out in the power supply, and the capacitor C is omitted3To obtain an equivalent circuit of the measuring device usIs an equivalent supply voltage, i.e. a cable conductor voltage (cable elbow terminal transient voltage including cable elbow terminal partial discharge signal, electrical fast transient pulse and lightning pulse), uoTo measure the voltage across the resistor, an equivalent circuit diagram is shown in fig. 5.
As can be seen from the equivalent circuit, the relationship between the voltage across the measuring resistor and the cable conductor voltage is:
by the above formula, the voltage u at two ends of the measuring resistor can be utilized0Calculating to obtain the voltage u of the cable conductorsI.e. cable elbow termination transient voltage.
The transient voltage on-line monitoring device for the cable elbow terminal has the following advantages:
1) the cable elbow type head can be directly transformed on the plug of the cable elbow type head, the normal operation of the cable elbow type head is not influenced, the cable elbow type head can be used on the already-put-into-operation elbow type head, and the cable elbow type head has the advantages of small size, simple structure, low cost and the like.
2) The grounding wire is reliably grounded, and the side surface 11 of the grounded embedded electrode is used as a shielding structure, so that the reflection problem does not exist in the signal transmission process, the distribution of an original electric field is not influenced, the accuracy and the safety of measurement are ensured, and the running state of equipment is not influenced.
3) And signals can be transmitted to the control terminal through optical fibers, so that the running state of the cable elbow-shaped head can be monitored on line.
Based on the principle, the invention also provides an online monitoring method for the transient voltage of the cable elbow terminal, which is used for the online monitoring device for the transient voltage of the cable elbow terminal. The method comprises the following steps:
1) the voltage across the measuring resistor is obtained.
2) Calculating the transient voltage of the elbow-shaped terminal of the cable according to the voltage at the two ends of the measuring resistor, the equivalent capacitor and the gap capacitor; the equivalent capacitor is an equivalent capacitor between the thread structure and the lower bottom surface of the embedded electrode; the gap capacitor is a gap capacitor between the side surface of the embedded electrode and the lower bottom surface of the embedded electrode; the cable elbow terminal transient voltage comprises a cable elbow terminal local discharge signal, an electrical fast transient pulse and a lightning pulse. The method specifically comprises the following steps:
wherein u issFor cable elbow termination transient voltages, C1Is an equivalent capacitance, C2Is a gap capacitance uoIn order to measure the voltage across the resistor, R is the resistance of the measuring resistor, and t is the time.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (9)
1. The utility model provides a cable elbow terminal transient state voltage on-line monitoring device which characterized in that includes: the device comprises a threaded structure, a plug insulation structure and a measurement transmission device; the threaded structure is arranged at one end of the plug insulating structure; the measuring and transmitting device is arranged at the other end of the plug insulating structure; the threaded structure is used for connecting a stud bolt of a cable elbow-shaped head;
the measurement transmission device comprises a pre-buried electrode, an adapter, a solid circular table and a measurement resistor; the embedded electrode is a truncated cone-like body with a truncated cone-shaped hollow structure inside and an opening on the upper bottom surface; the side surface of the embedded electrode is an outward convex arc; the lower bottom surface of the embedded electrode is a downward convex arc; the side surface of the embedded electrode is grounded; the solid round table is arranged inside the embedded electrode; the solid round table is contacted with the lower bottom surface of the embedded electrode; the solid round table is isolated from the side surface of the embedded electrode to form an isolation space; a through hole is formed in the lower bottom surface of the embedded electrode corresponding to the isolation space; filling an insulating material in the through hole; one end of the measuring resistor is connected with the lower bottom surface of one side of the through hole; the other end of the measuring resistor is connected with the lower bottom surface of the other side of the through hole; the embedded electrode and the solid circular truncated cone are connected with a cable through the adapter.
2. The cable elbow termination transient voltage on-line monitoring device of claim 1, wherein said adapter comprises an adapter housing and an adapter core; the side surface of the embedded electrode is connected with the shell of the cable through the adapter shell; the solid circular truncated cone is connected with the inner core of the cable through the adapter wire core.
3. The on-line monitoring device for the transient voltage of the elbow-shaped terminal of the cable according to claim 1, further comprising a voltage measuring device; the pressure measuring device is connected with the measurement transmission device through the cable; the voltage detector is used for measuring the voltage at two ends of the measuring resistor.
4. The on-line transient voltage monitoring device of claim 3, further comprising a voltage display connected to said voltage detector; the voltage display is used for displaying the voltage at two ends of the measuring resistor.
5. The device for on-line monitoring of the transient voltage of the elbow-shaped terminal of the cable according to claim 1, wherein the resistance value of the measuring resistor is 50 Ω -10M Ω.
6. The device for on-line monitoring of transient voltage of the elbow-shaped terminal of the cable according to claim 1, wherein the pre-buried electrode and the solid circular truncated cone are both made of metal materials.
7. The on-line transient voltage monitoring device of claim 1, wherein said insulating material is epoxy resin.
8. An online transient voltage monitoring method for a cable elbow terminal, which is used for the online transient voltage monitoring device for the cable elbow terminal according to any one of claims 1 to 7; the method comprises the following steps:
acquiring voltages at two ends of a measuring resistor;
calculating the transient voltage of the elbow-shaped terminal of the cable according to the voltage at the two ends of the measuring resistor, the equivalent capacitor and the gap capacitor; the equivalent capacitor is an equivalent capacitor between the thread structure and the lower bottom surface of the embedded electrode; the gap capacitor is a gap capacitor between the side surface of the embedded electrode and the lower bottom surface of the embedded electrode; the cable elbow terminal transient voltage comprises a cable elbow terminal local discharge signal, an electrical fast transient pulse and a lightning pulse.
9. The method according to claim 8, wherein the cable elbow terminal transient voltage is calculated from the voltage across the measuring resistor, the equivalent capacitance and the gap capacitance, and specifically comprises:
wherein u issFor cable elbow termination transient voltages, C1Is an equivalent capacitance, C2Is a gap capacitance uoIn order to measure the voltage across the resistor, R is the resistance of the measuring resistor, and t is the time.
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| CN202010927810.7A CN112034236B (en) | 2020-09-07 | 2020-09-07 | Online monitoring device and method for transient voltage of cable elbow terminal |
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| CN202010927810.7A CN112034236B (en) | 2020-09-07 | 2020-09-07 | Online monitoring device and method for transient voltage of cable elbow terminal |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113740611B (en) * | 2021-07-30 | 2023-08-01 | 深圳供电局有限公司 | Contact resistance measuring system and method for cable terminal elbow structure of power distribution switch cabinet |
| 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 |
| 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 |
| CN114113949A (en) * | 2021-12-03 | 2022-03-01 | 广东电网有限责任公司广州供电局 | Device for measuring partial discharge |
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