CN109387745B - Overvoltage sensing device for power distribution network - Google Patents
Overvoltage sensing device for power distribution network Download PDFInfo
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- CN109387745B CN109387745B CN201811572079.XA CN201811572079A CN109387745B CN 109387745 B CN109387745 B CN 109387745B CN 201811572079 A CN201811572079 A CN 201811572079A CN 109387745 B CN109387745 B CN 109387745B
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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
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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Abstract
The application discloses an overvoltage sensing device for a power distribution network, wherein a galvanized steel support is vertically arranged on a cross arm of a transmission tower, one end of the galvanized steel support is extended out of the cross arm of the transmission tower, a part extending out of the cross arm of the transmission tower is used for installing an energy-taking type insulator, the installation position of the energy-taking type insulator is positioned between the cross arms of the two transmission towers, the intersection of the galvanized steel support and the cross arm of the transmission tower is bundled and fixed by a stainless steel cable, the upper end of the energy-taking type insulator is fixedly connected with a cable clamp for a distribution network line by a bolt outgoing line, and the upper end of the energy-taking type insulator is connected with; the overvoltage measuring device is fixed below the cross arm of the transmission tower by using a hoop, and the overvoltage measuring device is connected with the output ends of the two insulators by using an aviation plug. The technical scheme of this application can be through the installation scheme of rational design energy-taking type insulator, collection type insulator and overvoltage measurement device etc. realize overvoltage sensing device's extensive application, the thunder overvoltage in the response distribution network effectively.
Description
Technical Field
The application relates to the technical field of analysis and measurement control, in particular to an overvoltage sensing device for a power distribution network.
Background
The distribution network is an electric power network which receives electric energy from a transmission network or a regional power plant and distributes the electric energy to various users on site through distribution facilities or step by step according to voltage. The power distribution network consists of overhead lines, cables, towers, distribution transformers, isolating switches, reactive power compensators, accessory facilities and the like, and plays a role in distributing electric energy in a power network.
Because the insulation level of the power distribution network is low, lightning strike is an important factor causing tripping of overhead lines of the power distribution network, and the damage of the lightning to the lines mainly comes from induced overvoltage generated by the lines under lightning high-frequency electromagnetic pulses. According to data statistics, the fault caused by the inductive lightning overvoltage reaches more than 90% of the fault proportion of the power distribution network, the fault has great influence on maintenance and operation cost, and the power quality index is obviously influenced. Therefore, if the actual measurement can be carried out to distribution network response thunder overvoltage, can know the characteristics of response thunder overvoltage more clearly, but current response thunder overvoltage monitoring devices all are in the experimental stage, because of the device gets the problem such as electric, signal transmission, divider operation maintenance, does not carry out large-scale application.
Therefore, how to effectively sense the lightning overvoltage in the power distribution network becomes a problem to be solved urgently by those skilled in the art.
Disclosure of Invention
The application provides a distribution network overvoltage sensing device, can respond to the thunder overvoltage in the distribution network effectively.
The application provides a distribution network overvoltage sensing device includes:
the device comprises a galvanized steel bracket, a stainless steel cable, an energy-taking insulator, a collecting insulator, a wire clamp and an overvoltage measuring device; the energy-taking insulator and the collecting insulator are arranged on the galvanized steel support, the galvanized steel support is transversely spaced from an associated wire, one end of the galvanized steel support extends out of the cross arm of the transmission tower, the part extending out of the cross arm of the transmission tower is used for mounting the collecting insulator, the energy-taking insulator is arranged between the two cross arms of the transmission tower, the intersection of the galvanized steel support and the cross arm of the transmission tower is fixedly bound by the stainless steel cable, the upper end of the energy-taking insulator is fixedly connected with a distribution network line by the wire clamp by a bolt outgoing line, and the upper end of the collecting insulator is connected with the upper end of the energy-taking insulator by a wire; the overvoltage measuring device is fixed below the cross arm of the transmission tower through a hoop, and the overvoltage measuring device is connected with the output ends of the two insulators through aviation plugs.
Optionally, the energy-taking insulator is provided with two ceramic capacitors C connected in series1And C2In which C is1And C2The energy-taking output end is led out from the joint, C2The other end of the second switch is led out of a grounding terminal.
Optionally, the collection type insulator is provided with two ceramic capacitors C connected in series3And C4In which C is3And C4An overvoltage signal output terminal, C, is led out of the connection4The other end of the second switch is led out of a grounding terminal.
Optionally, the capacitance of the ceramic capacitor is C1＝2.55nF，C2＝61nF。
Optionally, the capacitance of the ceramic capacitor is C3＝420pF，C4＝240nF。
Optionally, two fixing holes are formed in the galvanized steel support and are used for fixing the energy-taking insulator and the collecting insulator respectively.
Optionally, the overvoltage measurement device includes a switching power supply, a low power consumption data acquisition and analysis unit, and a wireless transmission module, where the switching power supply is connected to the energy-taking insulator, and converts an ac voltage in a line into a dc voltage to supply power to the overvoltage measurement device; the low-power consumption data acquisition and analysis unit is connected with the acquisition type insulator and is used for acquiring and analyzing overvoltage signals in a circuit; the wireless transmission module transmits the processed overvoltage signal to a monitoring background system to monitor and judge the running state of the line.
According to the technical scheme, the embodiment of the application provides a distribution network overvoltage sensing device, including: the device comprises a galvanized steel bracket, a stainless steel cable, an energy-taking insulator, a collecting insulator, a wire clamp and an overvoltage measuring device; the energy taking type insulator is arranged between the two transmission tower cross arms, the intersection of the galvanized steel support and the tower cross arms is bundled and fixed by a stainless steel cable, the upper end of the energy taking type insulator is fixedly connected with a cable clamp for a distribution network line by a bolt outgoing line, and the upper end of the energy taking type insulator is connected with the upper end of the energy taking type insulator by a lead; the overvoltage measuring device is fixed below the cross arm of the transmission tower by using a hoop, and the overvoltage measuring device is connected with the output ends of the two insulators by using an aviation plug. The technical scheme of this application can be through the installation scheme of rational design energy-taking type insulator, collection type insulator and overvoltage measurement device etc. realize overvoltage sensing device's extensive application, the thunder overvoltage in the response distribution network effectively.
Drawings
In order to more clearly illustrate 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 any creative effort.
Fig. 1 is a schematic structural diagram of an overvoltage sensing device for a power distribution network according to an embodiment of the present disclosure;
fig. 2 is a structural diagram of an energy harvesting insulator and a collecting insulator provided in the embodiment of the present application;
FIG. 3 is a top view of a galvanized steel bracket according to an embodiment of the present application;
fig. 4 is a block diagram of an overvoltage measurement device according to an embodiment of the present application.
Illustration of the drawings:
wherein, 1-galvanized steel support; 2-stainless steel cable; 3-energy-taking type insulator; 4-collection type insulator; 5, wire clamping; 6-overvoltage measurement means; 11-a first fixing hole; 12-a second fixation hole; 13-cross arm; 14-a wire; 31-an energy-taking output end; 32-ground; 41-overvoltage signal output; 61-a switching power supply; 62-a low power consumption data acquisition and analysis unit; 63-a wireless transmission module; 64-monitoring the background system.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.
Referring to fig. 1, an embodiment of the present application provides an overvoltage sensing device for a power distribution network, including: the device comprises a galvanized steel bracket 1, a stainless steel cable 2, an energy-taking insulator 3, a collecting insulator 4, a wire clamp 5 and an overvoltage measuring device 6; the energy-taking type insulator 3 and the energy-taking type insulator 4 are installed on the galvanized steel support 1, the galvanized steel support 1 is transversely spaced from associated wires, the weight and the size of the two insulators are considered during installation, one end of the galvanized steel support 1 is extended out of the cross arm 13 of the transmission tower, the part extending out of the cross arm 13 of the transmission tower is used for installing the energy-taking type insulator 4, the energy-taking type insulator 3 is located between the two cross arms 13 of the transmission tower, the intersection of the galvanized steel support 1 and the cross arm 13 of the transmission tower is bundled and fixed by the stainless steel cable 2, and particularly the stainless steel cable 2 can be stably fixed by adopting cross winding and the like, and two ends of the stainless steel cable 2 can be fixed by using tensioners; the upper end of the energy taking type insulator 3 is fixedly connected with the wire clamp 5 for a distribution network line through a bolt outgoing line, and the upper end of the collecting type insulator 4 is connected with the upper end of the energy taking type insulator 3 through a wire 14; the overvoltage measuring device 6 is fixed below the cross arm of the transmission tower through a hoop, and the overvoltage measuring device 6 is connected with the output ends of the two insulators through aviation plugs. Wherein, the transverse distance between the galvanized steel bracket 1 and the related lead is about 30cm, and the overvoltage measuring device 6 is fixed at a position about 1 m below the cross arm of the tower by using a hoop.
Further, as shown in fig. 2, the energy-taking type insulator 3 is provided with two ceramic capacitors C connected in series1And C2In which C is1And C2The energy-taking output end 31, C is led out from the joint2And the other end thereof is led out to the ground terminal 32. The capacity of the ceramic capacitor is respectively C1＝2.55nF，C2With this voltage division ratio, the energy-taking output terminal 31 can output about 230V of power frequency voltage, which is 61 nF. The collection type insulator 4 is provided with two ceramic capacitors C connected in series3And C4In which C is3And C4An overvoltage signal output 41, C is led out from the connection4And the other end thereof is led out to the ground terminal 32. The capacity of the ceramic capacitor is respectively C3＝420pF，C4With this voltage division ratio, about a 10V voltage signal can be output when the entire line is operating normally at 240 nF.
It should be noted that the ceramic capacitor capacity in the embodiment of the present application is not limited to the numerical value disclosed in the present application, and other suitable capacitor capacities may also be used, and the suitable capacitor capacities need to ensure that the two ceramic capacitors in the energy-taking insulator 3 and the energy-collecting insulator 4 are high-voltage capacitors and low-voltage capacitors, respectively.
Further, as shown in fig. 3, two fixing holes, namely a circular first fixing hole 11 and a circular second fixing hole 12, are formed in the galvanized steel bracket 1, and the size of the fixing holes is consistent with that of bolts at the upper end and the lower end of the insulator, so that the energy-taking insulator 3 and the collecting insulator 4 are fixed respectively.
Further, as shown in fig. 4, the overvoltage measurement device 6 includes a switching power supply 61, a low power consumption data acquisition and analysis unit 62, and a wireless transmission module 63, where the switching power supply 61 is connected to the energy-taking insulator 3, and converts an ac voltage in a line into a dc voltage to supply power to the overvoltage measurement device 6; the low-power-consumption data acquisition and analysis unit 62 is connected with the acquisition type insulator 4 and is used for acquiring and analyzing overvoltage signals in a circuit; the wireless transmission module 63 transmits the processed overvoltage signal to the monitoring background system 64 through a wireless signal, so as to monitor and judge the operation condition of the line.
According to the technical scheme, the embodiment of the application provides a distribution network overvoltage sensing device, including: the device comprises a galvanized steel bracket 1, a stainless steel cable 2, an energy-taking insulator 3, a collecting insulator 4, a wire clamp 5 and an overvoltage measuring device 6; the energy taking type insulator 4 is arranged on the cross arm of the transmission tower, the galvanized steel support 1 is vertically arranged on the cross arm of the transmission tower, the energy taking type insulator 3 and the collecting type insulator 4 are arranged and supported on the galvanized steel support 1, the galvanized steel support 1 is transversely spaced from an associated wire, one end of the galvanized steel support 1 is extended out of the cross arm of the transmission tower, the part extending out of the cross arm of the transmission tower is used for mounting the collecting type insulator 4, the energy taking type insulator 3 is arranged between the two cross arms of the transmission tower, the intersection of the galvanized steel support 1 and the cross arm of the transmission tower is bundled and fixed by a stainless steel cable 2, the upper end of the energy taking type insulator 3 is fixedly connected with a wire clamp 5 for a distribution network line by a bolt outgoing wire, and the upper end of the collecting type insulator 4; overvoltage measurement device 6 is fixed below the cross arm of the transmission tower by a hoop, and overvoltage measurement device 6 is connected with the output ends of the two insulators by aviation plugs. The technical scheme of this application can be through the installation scheme of rational design energy-taking type insulator, collection type insulator and overvoltage measurement device etc. realize overvoltage sensing device's extensive application, the thunder overvoltage in the response distribution network effectively.
The application is operational with numerous general purpose or special purpose computing system environments or configurations. For example: personal computers, server computers, hand-held or portable devices, tablet-type devices, multiprocessor systems, microprocessor-based systems, set top boxes, programmable consumer electronics, network PCs, minicomputers, mainframe computers, distributed computing environments that include any of the above systems or devices, and the like.
The application may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. The application may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (7)
1. An overvoltage sensing device for a power distribution network, comprising: the device comprises a galvanized steel bracket (1), a stainless steel cable (2), an energy-taking insulator (3), a collecting insulator (4), a wire clamp (5) and an overvoltage measuring device (6); wherein the galvanized steel bracket (1) is vertically arranged on a cross arm of a transmission tower, the energy-taking type insulator (3) and the collecting type insulator (4) are arranged on the galvanized steel bracket (1), the galvanized steel support (1) is transversely away from the associated lead, one end of the galvanized steel support (1) is extended out of the cross arm of the transmission tower, the part extending out of the cross arm of the transmission tower is used for mounting the collection type insulator (4), the energy-taking type insulator (3) is arranged between two transmission tower cross arms, the intersection of the galvanized steel bracket (1) and the tower cross arms is tied up and fixed by the stainless steel cable (2), the upper end of the energy-taking type insulator (3) is fixedly connected with the wire clamp (5) for the distribution network line by a bolt outgoing line, the upper end of the collection insulator (4) is connected with the upper end of the energy taking insulator (3) through a wire; the overvoltage measuring device (6) is fixed below the cross arm of the transmission tower through a hoop, and the overvoltage measuring device (6) is connected with the output ends of the two insulators through aviation plugs.
2. Device according to claim 1, characterised in that said insulator (3) of the energy-extracting type is provided with two ceramic capacitors C connected in series1And C2In which C is1And C2The energy-taking output end is led out from the joint, C2The other end of the second switch is led out of a grounding terminal.
3. Device according to claim 1, characterised in that the insulator (4) is provided with two ceramic capacitors C connected in series3And C4In which C is3And C4An overvoltage signal output terminal, C, is led out of the connection4The other end of the second switch is led out of a grounding terminal.
4. The apparatus of claim 2, wherein the ceramic capacitors each have a capacitance of C1＝2.55nF，C2＝61nF。
5. The apparatus of claim 3, wherein the ceramic capacitors each have a capacitance C3＝420pF，C4＝240nF。
6. The device according to claim 1, characterized in that the galvanized steel support (1) is provided with two fixing holes for fixing the energy-taking insulator (3) and the collecting insulator (4), respectively.
7. The device according to claim 1, characterized in that the overvoltage measuring device (6) comprises a switching power supply (61), a low power consumption data acquisition and analysis unit (62) and a wireless transmission module (63), wherein the switching power supply (61) is connected with the energy-taking insulator (3) and converts alternating voltage in a line into direct voltage to supply power to the overvoltage measuring device (6); the low-power-consumption data acquisition and analysis unit (62) is connected with the acquisition type insulator (4) and is used for acquiring and analyzing overvoltage signals in a circuit; the wireless transmission module (63) transmits the processed overvoltage signal to a monitoring background system to monitor and judge the running state of the line.
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| CN201811572079.XA CN109387745B (en) | 2018-12-21 | 2018-12-21 | Overvoltage sensing device for power distribution network |
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| CN201811572079.XA CN109387745B (en) | 2018-12-21 | 2018-12-21 | Overvoltage sensing device for power distribution network |
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| CN109387745B true CN109387745B (en) | 2020-06-05 |
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| CN111089999B (en) * | 2020-02-10 | 2021-04-13 | 华北电力大学 | Parallel AC high-voltage line voltage measuring device and method |
| CN113252971A (en) * | 2021-05-12 | 2021-08-13 | 云南电网有限责任公司丽江供电局 | FDTD-based distribution line inductive lightning overvoltage calculation method |
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