CN202159111U - Traveling wave ranging device based on FPGA - Google Patents

Abstract

The utility model discloses a traveling wave ranging device based on an FPGA (Field Programmable Gate Array). The traveling wave ranging device is characterized in that: the traveling wave ranging device adopts a modular design and comprises an analog quantity acquisition plate, a high-speed data acquisition plate, a central processor plate provided with a communication capability with two kinds of protocols, i.e., 104 and IEC (International Electrotechnical Commission) 61850, an Ethernet switch plate and a GPS (Global Position System) plate; wherein the analog quantity acquisition plate obtains a current/voltage signal of a secondary side of a circuit through a Hall current sensor or a Hall voltage sensor; the high-speed data acquisition plate consists of a high-speed analog-to-digital conversion chip A/D and the FPGA; and the central processor plate adopts an ARM chip and a high-capacity memory chip DDR2 (Double Data Rate 2), and is provided with an embedded uclinux operating system, the central processor plate receives fault data from the high-speed data acquisition plate and gives a ranging result after analyzing a position of a wave head of the traveling wave. The traveling wave ranging device of the utility model is used for satisfying storage and analysis of high-speed fault data.

Description

A kind of travelling wave ranging device based on FPGA

Technical field

The utility model relates to a kind of travelling wave ranging device of serving electric system.

Background technology

Modern traveling wave fault location technology can be achieved and constantly advance, fast-developing inseparable with association areas such as modern microelectric technique, global positioning system technology, modern communication technology and Digital Signal Processings.Wherein, Feasible high speed acquisition and the storage to the current temporary state signal of the application of microelectric technique becomes possibility, and the electric system synchronous clock that is applied as of GPS has been created condition, the development of modern communication technology; For electric system to intellectuality; Networking is laid a good foundation, and simultaneously, is the leap that the Digital Signal Processing of representative has promoted high-performance traveling wave fault location algorithm with the wavelet transformation.Therefore, on the basis of above technology, the method for utilizing the row ripple to find range has obtained using widely, but also has a lot of difficult points and deficiency.

The pattern that applied in the market travelling wave ranging device adopts traditional single-chip microcomputer or dsp chip to add the backstage industrial computer mostly; Because the frequency of row wave datum collection generally will be higher than 500kHz; And the data acquisition amount is bigger, and traditional dsp chip can't satisfy the requirement of large-capacity data high speed storing, therefore; The number of lines that travelling wave ranging device can be measured is fewer, can not satisfy the fast-developing needs of present transformer station scale.Moreover, the backstage industrial computer pattern of employing Window, the interference through regular meeting receives virus has greatly increased the work of maintenance personnel amount.In addition, current transformer station has begun to networking, the intelligent direction development, and traditional travelling wave ranging device can't be supported the IEC61850 communication protocol, can't adapt to intelligent transformer station development need.

The utility model content

The utility model is for avoiding above-mentioned existing in prior technology weak point, a kind of travelling wave ranging device based on FPGA is provided, with the storage of satisfying the high speed fault data and the requirement of analysis.

The utility model technical solution problem adopts following technical scheme:

The utility model based on the travelling wave ranging apparatus features of FPGA is: adopt modular design, comprise analog acquisition plate, HSDA plate, possess 104 and central processing unit plate, Ethernet switch plate and the GPS plate of the communication capacity of two kinds of stipulations of IEC61850;

Said analog acquisition plate is to obtain circuit secondary side current voltage signal with Hall current sensor or Hall voltage sensor; Send into the HSDA plate; Cooperate a HSDA plate, the electric parameters of gathering 12 passages in four circuits with an analog acquisition plate;

Said HSDA plate is made up of high speed analog-to-digital conversion chip A/D and programmable gate array FPGA; The acquired signal of analog acquisition plate is passed through behind signal conditioning circuit and the modulus conversion chip A/D calculating and the data storage at the inner starting algorithm of FPGA successively; When line fault, the HSDA plate sends to the central processing unit plate with the data of fault through network and analyzes and store;

Said central processing unit plate adopts ARM chip and high capacity memory chip DDR2, receives the fault data from the HSDA plate with said central processing unit plate, through analysis, forwarding and the storage to data, accomplishes the wavelet transformation of fault data; Behind the position of analyzing trip wave-wave head, the capable wave-wave head position of combined circuit opposite end provides the range finding result;

Said GPS plate is used to accomplish reception and the parsing to gps signal, utilizes crystal oscillator that temporal information and 1PPS signal are proofreaied and correct.

Compared with present technology, the utility model beneficial effect is embodied in:

1, the utility model utilizes wavelet transformation technique, and real-time analysis handling failure row wave datum is confirmed fault distance.Distance accuracy does not receive line length, fault type, stake resistance, the influence of load current etc.

2, high speed acquisition board of the utility model electric parameters that can gather 4 circuits; Configurable 2 high speed acquisition board of separate unit travelling wave ranging device; Add servicing unit, can insert 24 circuits simultaneously, but the line attachment capacity is big; Reduce user's use cost, can satisfy the design demand of general transformer station.

3, the utility model can utilize the method for both-end distance measuring after line fault, to provide the range finding result automatically under the cooperation of high-precision GPS, simultaneously the method for single end distance measurement is replenished as the effective of both-end distance measuring.Through constantly obtaining practical data, accumulation row ripple progress of disease characteristic setting up the expert system of single end distance measurement, thereby is prepared for single end distance measurement provides the range finding result automatically.

4, the utility model adopts the embedded hardware configuration, simple in structure, anti-electromagnetic interference (EMI), system integration design, high integrated, low coupling.

5, the utility model adopts the high-precision hall sensor; Have that dynamic perfromance is good, the linearity is high, precision is high, bandwidth and good characteristic such as size is little, peripheral circuit is simple; But the progress of disease is satisfied the requirement of travelling wave ranging device fully up to the current signal of 150kHz frequency.

6, in the utility model based on the setting of the high speed acquisition board of FPGA and DDR2, made full use of the ability of the parallel computation of FPGA, can realize the express-analysis and the jumbo storage of fault data.

7, the utility model adopts the built-in network design; Make high speed acquisition board have configuration function; Both can transmit fault data, also can be directly connected to main website, even can directly pass through data dispatching network and circuit end device exchange trouble data through central processing unit.

8, the communication modes of the utility model is supported IEC61850 and 104 two kinds of stipulations; The needs that both adapted to traditional transformer station; The needs of digital transformer substation also face the future; Can directly insert the digitalized substation secondary device condition monitoring system, will install running status and upload to the backstage, make the operations staff in time understand the device present situation.

9, the utility model has been avoided viral interference through full-embedded type operating system is set, and has greatly reduced staff's maintenance workload.

10, the utility model response speed is fast, can demonstrate to fast and reliable the travelling wave ranging result.

Description of drawings

Fig. 1 is the utility model equipments overall structure synoptic diagram.

Fig. 2 is the utility model device and circuit opposite end or main website data interaction synoptic diagram.

Fig. 3 is the utility model device high speed acquisition board structural representation.

Fig. 4 is the utility model device data flow synoptic diagram.

Embodiment

Referring to Fig. 1; Adopt modular design based on the travelling wave ranging device of FPGA in the present embodiment, comprise analog acquisition plate, HSDA plate, possess 104 and central processing unit plate, Ethernet switch plate and the GPS plate of the communication capacity of two kinds of stipulations of IEC61850;

The analog acquisition plate is to obtain from substation PT with Hall current sensor or Hall voltage sensor; CT attracts circuit secondary side current voltage signal; Send into the HSDA plate; Cooperate a HSDA plate, the electric parameters of gathering 12 passages in four circuits with an analog acquisition plate;

The HSDA plate is made up of high speed analog-to-digital conversion chip A/D and programmable gate array FPGA; The acquired signal of analog acquisition plate is passed through behind signal conditioning circuit and the modulus conversion chip A/D calculating and the data storage at the inner starting algorithm of FPGA successively; When line fault, the HSDA plate sends to the central processing unit plate with the data of fault through network and analyzes and store;

FPGA has parallel processing capability, and under the constant-temperature crystal oscillator support of high reliability, frequency of operation is 80M, and its time precision can reach 10ns, can satisfy the requirement to time precision under high sampling rate of travelling wave ranging device fully.In addition; HSDA plate configuration mass storage; The memory module that the DDR2 internal memory of 2Gbit combines with multi-disc 16M serial Flash, signals collecting does not have the dead band, and the fault data that every circuit can be stored can reach more than 50,000; The assurance fault data can not lost, and has realized the security of fault data.

The central processing unit plate adopts ARM chip I XP425 and the high capacity memory chip DDR2 of Intel; And embedded uclinux operating system is set; Receive fault data with said central processing unit plate from the HSDA plate; Through analysis, forwarding and storage, accomplish the wavelet transformation of fault data to data; Behind the position of analyzing trip wave-wave head, the capable wave-wave head position of combined circuit opposite end provides the range finding result;

ARM chip I XP425 has abundant Peripheral Interface resource, and is low in energy consumption, and reliability is high.Support high capacity CF card, the solid state hard disc interface can be realized the redundancy backup of traveling wave fault data, further improves the reliability of fault data.Simultaneously, this ARM chip supports the network of a plurality of network segments to connect, and can insert a plurality of main websites simultaneously, opposite end and dispatch automated system.

The GPS plate is used to accomplish reception and the parsing to gps signal, utilizes crystal oscillator that temporal information and 1PPS signal are proofreaied and correct, the GPS plate to time error less than 50ns, the error behind the punctual 1h is less than 6.7us.

Referring to Fig. 2, the travelling wave ranging device is communicated by letter with opposite end or main website end and is adopted the IEC61850 stipulations in this instance.It has characteristics such as unification, standard, the easy expansion of self-described as the Standards Code of intelligent transformer station, and it is of a great variety to have solved present traditional transformer station stipulations, incompatible, is difficult to shortcomings such as expansion, the same stipulations of transformer station after will becoming.

Because the IEC61850 more complicated, the mapping level is many, implements the comparison difficulty.The mapping of built-in IEC61850 stipulations of present embodiment and real-time data base can be changed with other kinds stipulations easily each other.To three types data communication between the two cover travelling wave ranging devices, three cover IEC61850 solutions below having designed:

1, file transfer: between two cover travelling wave ranging devices, transmit big data quantity sampled data file;

2, send in the active of soe burst information: service end initiatively transmits report controll block between two cover travelling wave ranging devices;

3, send control command: client is sent control command between two cover travelling wave ranging devices, and service end data class model is carried out the read data value, operation such as data value is set.

Referring to Fig. 3, the high speed acquisition board of this instance adopts the Cyclone Series FPGA of U.S. altera corp, and is low in energy consumption, is applicable to high capacity storage application, and supports the high speed external memory interface, comprises DDR2-SDRAM (ddr sdram) etc.The soft nuclear of NiosII CPU that it is exclusive; Avolon bussing technique and based on programmable SOC(system on a chip) SOPC (System On Programmable Chip) framework; Make the structure of system more efficient and convenient, both improved level of integrated system, shortened the cycle of exploitation again.Rich and varied IP kernel resource reliability is high, the configuration simple and flexible.The IP kernel that uses in this instance comprises wave digital lowpass filter FIR unit, discrete Fourier transformation DFT unit and DDR2 controller etc.

Referring to Fig. 4, the fpga chip of present embodiment is operated under the 80MHz frequency, controls the data acquisition that the high-speed AD chip carries out 800kHz on the one hand, can simultaneously the data of gathering be carried out the calculating and the wavelet transformation of starting algorithm on the other hand.Through jumbo DDR2 internal memory and FLASH fault data is preserved at last.Data acquisition does not have the dead band, even continuous several times generation transition effect, the fault traveling wave data can not lost yet.Because the FPGA travelling speed is fast, under the clock of 80MHz, the work period can reach 10ns, has improved signal processing efficiency, can realize the synchronous calculating of many circuits simultaneously, can satisfy the collection requirement of travelling wave ranging device to high-frequency signal again.

Claims (1)

1. travelling wave ranging device based on FPGA; It is characterized in that: adopt modular design, comprise analog acquisition plate, HSDA plate, possess 104 and central processing unit plate, Ethernet switch plate and the GPS plate of the communication capacity of two kinds of stipulations of IEC61850;

Said analog acquisition plate is to obtain circuit secondary side current voltage signal with Hall current sensor or Hall voltage sensor; Send into the HSDA plate; Cooperate a HSDA plate, the electric parameters of gathering 12 passages in four circuits with an analog acquisition plate;

Said HSDA plate is made up of high speed analog-to-digital conversion chip A/D and programmable gate array FPGA; The acquired signal of analog acquisition plate is passed through behind signal conditioning circuit and the modulus conversion chip A/D calculating and the data storage at the inner starting algorithm of FPGA successively; When line fault, the HSDA plate sends to the central processing unit plate with the data of fault through network and analyzes and store;

Said central processing unit plate adopts ARM chip and high capacity memory chip DDR2, receives the fault data from the HSDA plate with said central processing unit plate, through analysis, forwarding and the storage to data, accomplishes the wavelet transformation of fault data; Behind the position of analyzing trip wave-wave head, the capable wave-wave head position of combined circuit opposite end provides the range finding result;

Said GPS plate is used to accomplish reception and the parsing to gps signal, utilizes crystal oscillator that temporal information and 1PPS signal are proofreaied and correct.

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