CN201464534U - Monitoring device for lightning travelling wave in transmission line - Google Patents

Abstract

The utility model relates to monitoring of lightning travelling wave in transmission line, which provides a monitoring device for lightning travelling wave in transmission line. The device comprises a power source unit, a current sensor unit, a data acquisition and processing unit and a communication unit, wherein, the current sensor unit, the data acquisition and processing unit, and the communication are all connected with the power source unit, and the output end of the current sensor is connected with the input end of the data acquisition and processing unit, and the output end of the data acquisition and processing unit is connected with the input end of the communication unit; meanwhile, the monitoring device transmits the data to Internet network data center through GPRS communication technology.

Description

The capable ripple monitoring device of power transmission line lightning shielding

Technical field

The utility model relates to electric system lightning monitoring field, particularly relates to the capable ripple monitoring of power transmission line lightning shielding field.

Background technology

In transmission line of electricity electric pressure today to the development of UHV (ultra-high voltage) and extra-high voltage, lightning strike accident remains and causes one of major reason that transmission line malfunction cut-offs.The relevant apparatus that does not have the capable ripple of direct Monitoring Line thunder and lightning in the market makes the research of being struck by lightning on the transmission line of electricity can't carry out in a deep going way with protection.

Summary of the invention

Technical problem to be solved in the utility model is: the capable wave-wave shape of real time record thunder and lightning, and data are passed to the Internet network data center with the GPRS communication technology.

The technical scheme that the utility model adopted is: monitoring device comprises power supply unit, current sensor unit, data acquisition and processing unit and communication unit, current sensor unit, data acquisition all link to each other with power supply unit with processing unit, communication unit, the output terminal of current sensor is connected to the input end of data acquisition and processing unit, and the output terminal of data acquisition and processing unit is connected to the input end of communication unit; Monitoring device passes to the Internet network data center by the GPRS communication technology with data.

With respect to prior art, this device has the following advantages:

1) need not every basic shaft tower be installed by monitoring device, a point is installed every about 10 kilometers, can realize that a small amount of device is to the transmission line of electricity thunder and lightning characteristic monitoring of section completely;

2) realized robotization, the intellectuality and information-based that the capable ripple of power transmission line lightning shielding is monitored.

Description of drawings

Fig. 1 is the local supervising and measuring equipment theory diagram.

Fig. 2 is the axial section of local supervising and measuring equipment.

Fig. 3 is the coupling transformer structural drawing.

Fig. 4 is the schematic diagram of power module translation circuit.

Fig. 5 is the schematic diagram of current sensor.

Fig. 6 is the schematic diagram of collection in worksite and processing unit.

Fig. 7 is the schematic diagram of communication unit.

Fig. 8 is the synoptic diagram of specific embodiment.

Embodiment

The capable ripple monitoring device of thunder and lightning theory diagram as shown in Figure 1, it comprises power supply unit, current sensor unit, data acquisition and processing unit and communication unit, current sensor unit, data acquisition all link to each other with power supply unit with processing unit, communication unit, the output terminal of current sensor is connected to the input end of data acquisition and processing unit, and the output terminal of data acquisition and processing unit is connected to the input end of communication unit; Local supervising and measuring equipment establishes a communications link by wireless communication technology and host computer.

The capable ripple monitoring device of thunder and lightning sectional view is as shown in Figure 2: on-site terminal shell 6 is made of metal, and its first half is connected by draw-in groove with Lower Half, the Lower Half support 7 of on-site terminal shell 6, current sensor 2, mainboard box 3.Coupling transformer 1 is the inside of terminal enclosure 6 at the scene, and coupling transformer 1 is installed on the support 7.Transmission line wire passes the pickup coil of coupling transformer 1 and the coil of current sensor 2 by the lead perforation 4 of on-site terminal shell 6 ends.Power supply unit comprises coupling transformer 1 and translation circuit, and the current sensor unit comprises current sensor 2.The translation circuit of power supply unit, data acquisition and processing unit, communication unit are installed in the mainboard box 3.The dedicated antenna of communication unit configuration is stretched out this case body by the antenna perforation 5 of mainboard box 3 and on-site terminal shell 6 ends, to ensure the good of signal of communication.

Coupling transformer 1 structural drawing as shown in Figure 3.It is made up of two identical semiorbicular silicon sheet core materials of sectional area, and twines 30～60 circle leads on a semi-circular iron core therein, and transmission line wire is passed in the centre of silicon sheet core.The cross section of silicon sheet core is the rectangle of long 40mm, wide 20mm.

Conversion goes out the required power supply of entire field monitoring device work to power supply unit by the input current in the coupling power transmission line lead.The translation circuit block diagram of power supply unit as shown in Figure 4; input current is introduced into the common mode filtering circuit; the output terminal of common mode filtering circuit is connected to the input end of full-wave rectifying circuit; the output terminal of full-wave rectifying circuit is connected to the input end of differential mode filtering circuit, and the output terminal of differential mode filtering circuit is connected to out-put supply by overvoltage crowbar.The main cancellation element common mode of common mode filtering circuit high frequency interference, it adopts the wire-wound inductor of ferrite core, about inductance size 8mH.Full-wave rectifying circuit mainly is rectified into input current the direct supply of pulsation, and it adopts the KRB206 rectification module.The main cancellation element differential mode interference of differential mode filtering circuit, it uses differential mode inductance.Overvoltage crowbar is when the device overvoltage, and the protection out-put supply is without prejudice.

The principle of current sensor unit as shown in Figure 5, it has adopted the Rogowski coil, the Rogowski current sensor is compared with traditional electromagnetic transformer, and it does not have saturation problem unshakable in one's determination, has advantages such as transmission frequency bandwidth, interference free performance excellence, size are little, light weight.The current sensor unit has the frequency response characteristic up to tens, and it is converted to the signal that data acquisition and processing unit can be gathered with the lightning current propagated on the transmission line wire and power frequency fault current.The Rogowski coil be with lead equably on a non-ferromagnetic annular skeleton, one time bus places coil central authorities, so the current potential between winding coil and the bus is isolated.If magnetic induction density is Φ (t), bus current is I (t), turn number N, and coil section amasss S, coil radius r, the time is t, then the induction electromotive force e (t) on coil is:

$e\left(t\right)=-\frac{\mathrm{d\φ}\left(t\right)}{\mathrm{dt}}=-\frac{\mathrm{\μNS}}{2\mathrm{\πr}}\·\frac{\mathrm{dI}\left(t\right)}{\mathrm{dt}}$

μ is air (or vacuum) magnetic permeability in the formula.

Lightning current and power current that data acquisition and processing unit will be imported simulating signal again are converted to digital signal, and its circuit diagram as shown in Figure 6.This unit mainly comprises microprocessor MSP430F169, FPGA EP1C144C8 (EP1 series), high-speed AD acquisition device AD9280 and jumbo SRAM memory.The input end of the input end of crystal oscillator, house dog and reset circuit, signal adjustment circuit I, FPGA, an input end of SRAM memory all link to each other with the respective pins of MSP430F169.Signal adjustment circuit II output terminal is connected to the input end of AD9280, and the output terminal of AD9280 is connected to another input end of FPGA.The MSP430F169 that signal adjustment circuit I enters embedded AD converter of leading up to of input simulating signal gathers, another road is sent into AD9280 by signal adjustment circuit II and is gathered, the input simulating signal is through after gathering, enter FPGA and control by it, be stored in then in the jumbo external SRAM, for transmission.Two paths of signals can real-time as required reliable transmission.

Communication unit can adopt GPRS communication system or cdma communication system. and with the GPRS communication system is example, as shown in Figure 7, communication unit mainly comprises the serial interface of microprocessor MSP430F169, Siemens GPRS communication module MC35i, SIM card circuit and SRAM storer. the serial interface of microprocessor MSP430F169 is connected to the input end of MC35i, MC35i also links to each other with the SRAM memory with the SIM card circuit. and the data that process data acquisition and processing unit collect enter MC35i by serial interface and transmit, pass through operation of serial-port between MC35i and microprocessor MSP430F169, use various AT to instruct mutual communication, simultaneously in the software of GPRS module, embed ICP/IP protocol, with the Network Transmission .SIM card circuit of realizing data mainly by SIM card that present mobile operator was provided, composition .SIM cards such as the drawer type deck of 6 pins are the chips that have microprocessor, it is a smart card that meets the GSM standard, its inside comprised that operator provides with subscriber-related, be stored in this side's of user information, so that being provided, gsm system differentiates the legitimacy of SIM, 6 pins that are based on the necessary condition .SIM card of GPRS communication link to each other with communication module MC35i by the drawer type deck, finish temporary variable and a large amount of various collection Wave data in the main storage microprocessor MSP430F169 of the exchanges data .SRAM memory processing procedure, for transmission. communication unit uploads to the host computer management system with digitized waveform signal. consider the influence of fading of impulse corona to the lightning current waveform,, on each phase conductor, and establish a communications link every erecting stage, about 10 kilometers left and right sides monitoring device by GPRS or cdma wireless communication technology and host computer.

Embodiment:

As shown in Figure 8, there is one long 50 kilometers 220kv transmission line of electricity in somewhere Utilities Electric Co., and the lightning stroke trip accident of this circuit is more, the capable ripple monitoring device of a cover power transmission line lightning shielding can be installed to grasp the details of thunderbolt, so that the research safeguard procedures.Erecting stage monitoring device quadruplet on each phase conductor of transmission line of electricity is respectively the A3 at the A2 at the A1 from 10 kilometers places of first transformer station, 20 kilometers places, 30 kilometers places and the A4 at 40 kilometers places.In that being arranged on the computing machine that can go up the Internet network of fixing IP, installation data accepts software.

This device major function performance index is as follows:

Current traveling wave sampling rate: 10M

Data upload time≤5 second

In current and even quite a long time from now on, will be an important process of meteorology and power department to the research of thunder and lightning, the application of this device will provide the basis to researchs such as the regularity of distribution of thunder and lightning, destruction characteristics.

Claims (2)

1. capable ripple monitoring device of power transmission line lightning shielding, it is characterized in that monitoring device comprises power supply unit, current sensor unit, data acquisition and processing unit and communication unit, current sensor unit, data acquisition all link to each other with power supply unit with processing unit, communication unit, the output terminal of current sensor unit is connected to the input end of data acquisition and processing unit, and the output terminal of data acquisition and processing unit is connected to the input end of communication unit; Monitoring device passes to the Internet network data center by the GPRS communication technology with data.

2. the capable ripple monitoring device of power transmission line lightning shielding as claimed in claim 1 is characterized in that: described current sensor unit comprises the Rogowski coil.

Images