CN201860099U - Low current grounding fault line selection device - Google Patents
Low current grounding fault line selection device Download PDFInfo
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- CN201860099U CN201860099U CN2010206036911U CN201020603691U CN201860099U CN 201860099 U CN201860099 U CN 201860099U CN 2010206036911 U CN2010206036911 U CN 2010206036911U CN 201020603691 U CN201020603691 U CN 201020603691U CN 201860099 U CN201860099 U CN 201860099U
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Abstract
The utility model relates to a low current grounding fault line selection device comprising a multi-path signal input interface, an operational amplifier conditioning circuit, an AD conversion module, a central processing unit, an I/O interface, a power supply and a human-machine interactive interface, wherein the multi-path signal input interface, the operation amplifier conditioning circuit and the AD conversion unit are sequentially connected; the AD conversion module, the I/O interface and the human-machine interactive interface are bilaterally connected with the central processing unit respectively; the power supply is connected with each component for supplying power; the central processing unit has a multiple processor structure, and comprises a main control CPU chip, a DSP (digital signal processor) chip, an FPGA (field programmable gate array) chip, a memory and a peripheral circuit; and the AD conversion module is connected with the DSP chip, the I/O interface is connected with the FPGA chip, and the human-machine interactive interface is connected with the main control CPU chip. The utility model improves the line selection reliability, has simple structure, realizes the on-line configuration, fits for multiple line selection theories, has small volume, low power consumption and low cost, and is beneficial for large-scale application.
Description
Technical field
The utility model relates to small current neutral grounding system, is a kind of Small Electric Current Earthing And Routing Device.
Background technology
Take place in small current neutral grounding system under the single phase ground fault situation, the zero-sequence current of generation is very little, and how the faulty line of choosing promptly and accurately becomes a difficult problem.Do number of research projects for a long time both at home and abroad, proposed many route selection theories, released a lot of line selection apparatus, obtained certain effect.But in practical engineering application, still there are many deficiencies.
The precision of AD conversion has direct influence to the route selection result of device.Present traditional line selection apparatus generally adopts 8 AD, and precision is not high enough.Different route selection theories is also different to the requirement of the speed of AD conversion, wherein, utilizes method the having relatively high expectations to the AD conversion of fault transient information route selection.So present little electric current line selection apparatus can not make full use of the transient state component of fault message.
Along with increasing and the application of complicated algorithm of sample frequency, data-handling capacity to Small Electric Current Earthing And Routing Device is had higher requirement, and because Small Electric Current Earthing And Routing Device requires processor to handle in real time the data that collect, traditional C PU can not satisfy the real-time processing requirement to big data quantity.
Summary of the invention
Problem to be solved in the utility model is: existing small current neutral grounding device can not satisfy user demand, can not make full use of the transient state component of fault message, and the single CPU control in the conventional apparatus can not have been satisfied the real-time processing requirement to big data quantity.
The technical solution of the utility model is: a kind of Small Electric Current Earthing And Routing Device, comprise the multiple signals input interface, the amplifier modulate circuit, the AD modular converter, CPU, the I/O interface, power supply and Man Machine Interface, the multiple signals input interface, the amplifier modulate circuit, the AD modular converter connects successively, the AD modular converter, the I/O interface is connected with CPU is two-way respectively with Man Machine Interface, power supply connects various piece provides power supply, wherein CPU is a multi-processor structure, by the master cpu chip, dsp chip, fpga chip, memory and peripheral circuit constitute, the AD modular converter is connected with dsp chip, the I/O interface is connected with fpga chip, and Man Machine Interface is connected with the master cpu chip.
Be provided with the TV/TA buffer circuit between being connected of multiple signals input interface and amplifier modulate circuit.
The master cpu chip of CPU also connects CAN, USB, RS-232, SPI and network interface.
The AD modular converter is made up of a plurality of parallel AD converter.
The hardware platform that the utility model provides a kind of performance that can be good at satisfying the small current earthing wire-selecting system, reliability, cost, volume etc. to require, propose specially at the characteristics of Small Electric Current Earthing And Routing Device, import the filtering of amplifier modulate circuit by the residual voltage current signal that zero sequence current mutual inductor collects by the multiple signals input interface, send into the AD modular converter after the amplification and carry out the AD conversion, obtain digital signal, these digital signals are sent into dsp chip carry out synchroballistic.Owing to cancelled sampling holder, need carry out the sample-synchronous compensation to the sampled data of AD, and AD sample frequency height of the present utility model, data volume is big, existing microcomputer often can not satisfy application request aspect real-time sampling, the processing, the utility model has designed the high-speed data processing unit based on dsp chip, adopts master cpu to constitute master-slave system, solves this class problem preferably.
The utility model adopts multi-processor structure, cancelled sampling holder, realize sample-synchronous by dsp chip, the sample frequency height, can make full use of fault message, utilize the selection method of fault transient information higher to the rate request of AD conversion, the transient zero-sequence current free oscillation frequency can reach several thousand Hz, present Small Electric Current Earthing And Routing Device sample frequency is generally lower, can not make full use of the transient state component of fault message, for satisfying the specification requirement of transient state route selection, the utility model high-speed data acquistion system sample frequency maximum can reach every power frequency cycle 512 points of sampling, and the sample frequency of single line can reach 25.6Hz.For satisfying the high-speed data acquisition of multiple signals, the utility model is divided into several groups with analog signal, adopt the parallel mode of operation of many AD, and realize the control of sampling time sequence logic by FPGA, every group has 4 voltage channels and 14 current channels, is responsible for 4 road voltage signals and 14 road current signals on one section bus respectively.The utility model improves the route selection reliability; Simple in structure, can realize the Configuration Online of hardware being applicable to multiple route selection theory; Volume is little, low-power consumption, and low cost helps large-scale application; Modularized design method makes the Installation and Debugging of whole system convenient.
Description of drawings
Fig. 1 is the formation of small current earthing wire-selecting hardware system.
Fig. 2 is the high-speed data acquistion system schematic diagram.
Embodiment
As Fig. 1, the utility model comprises the multiple signals input interface, the amplifier modulate circuit, the AD modular converter, CPU, the I/O interface, power supply and Man Machine Interface, the multiple signals input interface, the amplifier modulate circuit, the AD modular converter connects successively, the AD modular converter, the I/O interface is connected with CPU is two-way respectively with Man Machine Interface, power supply connects various piece provides power supply, wherein CPU is a multi-processor structure, by the master cpu chip, dsp chip, fpga chip, memory and peripheral circuit constitute, the AD modular converter is connected with dsp chip, the I/O interface is connected with fpga chip, and Man Machine Interface is connected with the master cpu chip.Be provided with the TV/TA buffer circuit between being connected of multiple signals input interface and amplifier modulate circuit, the I/O interface connects the switching value interface.The master cpu chip of CPU also connects CAN, USB, RS-232, SPI and network interface.
The following describes embodiment of the present utility model:
The utility model partly is made up of signal input, AD conversion, CPU, amplifier conditioning, switching value input and output, power supply and Man Machine Interface etc., each several part connects by bus, as shown in Figure 1, for satisfying the requirement of power distribution automation backstage monitoring, the utility model also provides CAN, USB, RS-232, SPI and network interface, can finish networking, system maintenance, route selection result and function such as report.
1 signal processing flow:
The residual voltage current signal that collects by zero sequence current mutual inductor is sent into the AD modular converter by the multiple signals input interface through the filtering of amplifier modulate circuit, after amplifying and is carried out the AD conversion, obtain digital signal, these digital signals are sent into dsp chip carry out synchroballistic, data are subsequently sent into the master cpu chip and are carried out ground connection judgement, take place if any earth fault, then move line selection algorithm, provide route selection result and preservation.
2 high-speed data acquistion systems:
High-speed data acquistion system comprises many input selector switches, and a plurality of AD converter are connected with DSP, CPU, FPGA, can be configured programmable gate array FPGP by CPU according to actual conditions, adjusts the quantity and the sample frequency of input channel.Transient zero-sequence current thousand frequencies of oscillation are very high, can reach several thousand Hz, and in order to satisfy the specification requirement of transient state route selection, high-speed data acquistion system sample frequency maximum can reach every power frequency cycle 512 points of sampling, and the sample frequency of single line can reach 25.6kHz.For satisfying the high-speed data acquisition of multiple signals, analog signal can be divided into several groups, adopt the parallel mode of operation of a plurality of AD converter, and realize the control of sampling time sequence logic by FPGA, every group has 4 voltage channels and 14 current channels, is responsible for 4 road voltage signals and 14 road current signals on one section bus respectively.System schematic as shown in Figure 2.
The utility model has been cancelled the sampling holder in the traditional data collection, and employing is carried out the sample-synchronous compensation by the method that dsp chip carries out software compensation, has further simplified system configuration.Because the sample frequency height of system, the error after the compensation is very little, does not influence the precision of route selection.
3 CPU:
CPU is made of master cpu, DSP, FPGA, memory and peripheral components.DSP finishes the synchroballistic of sampled data and can handle sampled data according to the algorithm needs of reality, and buffered data.FPGA realizes logic control and input and output control, comprises data sampling control.
Owing to cancelled sampling holder, need carry out the sample-synchronous compensation to the sampled data of AD, and AD sample frequency height of the present utility model, data volume is big, existing microcomputer often can not satisfy application request aspect real-time sampling, the processing, can solve this class problem preferably and constitute master-slave system based on the high-speed data processing unit of the chip of DSP and master cpu.
There are abundant trigger and I/O pin in FPGA inside, can realize complicated logic.FPGA is programmed by the RAM that leaves in the sheet.FPGA has the various configurations pattern, and FPGA is operated in the peripheral hardware pattern in the native system, by host CPU it is programmed.The application of FPGA has improved the integrated level of system, has simplified the structure of device, has improved the reliability of system.Simultaneously, because the field-programmable of FPGA, device can be adjusted sample frequency and signalling channel number as required, is the upgrading of existing system hardware.
Claims (4)
1. Small Electric Current Earthing And Routing Device, it is characterized in that comprising the multiple signals input interface, the amplifier modulate circuit, the AD modular converter, CPU, the I/O interface, power supply and Man Machine Interface, the multiple signals input interface, the amplifier modulate circuit, the AD modular converter connects successively, the AD modular converter, the I/O interface is connected with CPU is two-way respectively with Man Machine Interface, power supply connects various piece provides power supply, wherein CPU is a multi-processor structure, by the master cpu chip, dsp chip, fpga chip, memory and peripheral circuit constitute, the AD modular converter is connected with dsp chip, the I/O interface is connected with fpga chip, and Man Machine Interface is connected with the master cpu chip.
2. a kind of Small Electric Current Earthing And Routing Device according to claim 1 is characterized in that being provided with the TV/TA buffer circuit between being connected of multiple signals input interface and amplifier modulate circuit.
3. a kind of Small Electric Current Earthing And Routing Device according to claim 1 is characterized in that the master cpu chip of CPU also connects CAN, USB, RS-232, SPI and network interface.
4. according to claim 1 or 2 or 3 described a kind of Small Electric Current Earthing And Routing Devices, it is characterized in that the AD modular converter is made up of a plurality of parallel AD converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206036911U CN201860099U (en) | 2010-11-12 | 2010-11-12 | Low current grounding fault line selection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206036911U CN201860099U (en) | 2010-11-12 | 2010-11-12 | Low current grounding fault line selection device |
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| CN201860099U true CN201860099U (en) | 2011-06-08 |
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| CN2010206036911U Expired - Fee Related CN201860099U (en) | 2010-11-12 | 2010-11-12 | Low current grounding fault line selection device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102608499A (en) * | 2012-04-03 | 2012-07-25 | 云南电网公司红河供电局 | Low-current line selection device and control method for inhibiting unbalanced current by way of differential filtration |
| CN102768326A (en) * | 2012-07-04 | 2012-11-07 | 南京工业大学 | Compensation power grid single-phase earth fault line selection device and method |
| CN103177132A (en) * | 2013-03-26 | 2013-06-26 | 国家电网公司 | Multi-line information collecting system |
-
2010
- 2010-11-12 CN CN2010206036911U patent/CN201860099U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102608499A (en) * | 2012-04-03 | 2012-07-25 | 云南电网公司红河供电局 | Low-current line selection device and control method for inhibiting unbalanced current by way of differential filtration |
| CN102768326A (en) * | 2012-07-04 | 2012-11-07 | 南京工业大学 | Compensation power grid single-phase earth fault line selection device and method |
| CN102768326B (en) * | 2012-07-04 | 2015-05-20 | 南京工业大学 | Compensation power grid single-phase earth fault line selection device and method |
| CN103177132A (en) * | 2013-03-26 | 2013-06-26 | 国家电网公司 | Multi-line information collecting system |
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| C14 | Grant of patent or utility model | ||
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110608 Termination date: 20131112 |