CN201910669U

CN201910669U - Power distribution automation terminal

Info

Publication number: CN201910669U
Application number: CN201020674541XU
Authority: CN
Inventors: 余南华; 陶维青; 陈炯聪; 张巧云; 朱学俊
Original assignee: Shanghai Csg Smart Sci&techco ltd; Hefei University of Technology; Electric Power Research Institute of Guangdong Power Grid Co Ltd
Current assignee: Shanghai Csg Smart Sci&techco ltd; Hefei University of Technology; Electric Power Research Institute of Guangdong Power Grid Co Ltd
Priority date: 2010-12-22
Filing date: 2010-12-22
Publication date: 2011-07-27
Anticipated expiration: 2020-12-22

Abstract

The utility model relates to a power distribution automation terminal comprising a DSP (Digital Signal Processor). The signal input end of the DSP is respectively connected with a voltage transformer, a current transformer and a switching value input circuit, the signal output end of the DSP processor is connected with a relay, the signal input and output ends of the DSP are accessed to the Ethernet through a W5100 chip and the DSP is connected with a memory card. In the utility model, Due to the adoption of the DSP serving as a central processing unit and the combination of an analog switch, the power distribution automation terminal can accurately measure a multi-channel three-phase voltage and a multi-channel three-phase current and monitor various impulse and state quantities, has the advantages of high processing speed, high accuracy in measurement, small size, high reliability, low cost, lower overall system investment and obvious economic benefit. In the utility model, as an inner FLASH and the memory card of the DSP are adopted to store the parameters required by measurement, the problem caused by an external memory EEPROM (Electrically Erasable Programmable Read-Only Memory) due to data loss is effectively avoided and the reliability of the terminal is further improved.

Description

A kind of distribution power automation terminal

Technical field

The utility model relates to a kind of electric power terminal, especially a kind of distribution power automation terminal.

Background technology

Power distribution automation is the integrated system of the automation function of the operation, monitoring, maintenance and the user management that comprise transformer station, power distribution network and user.The enforcement of early stage power distribution automation is adopted independently, the individual event automated system solves problem, promptly measure, monitoring, communication module all be separately design, though can concentrate placement, unified management, but still need lay various communication line between each equipment to guarantee mutual back work and coordination, and each equipment all will dispose special communication interface circuit and be connected with the upload control main website, cause resource to repeat, and it keeps in repair and maintenance difficulties is big, cost is high, reliability is low.Along with the development of power distribution automation, the development trend integrated, intelligent, that synthesization is distribution power automation terminal, the deficiency on the performance that early stage distribution power automation terminal structure is brought is then more and more obvious, and major defect comprises the following aspects:

(1) most distribution power automation terminal uses the analog to digital converter ADC that primary processor inside carries, and precision is low, and the communication function of terminal and main website is not strong simultaneously, does not support ethernet communication;

(2) metering module is less to the measurement channel of AC signal, if the multichannel AC signal is measured, needs to use multi-disc analog to digital converter chip, has increased the cost of system;

(3) present most distribution power automation terminal, general is stored in the important parameter of equipment operation in the external memory storage, because on-the-spot interference may change the data of external memory storage, causes terminal normally not move, and has reduced the reliability of system.

The utility model content

The purpose of this utility model is to provide a kind of metering, monitoring, communication, data storage function of integrating, and possesses the distribution power automation terminal of more metering sampling channel.

For achieving the above object, the utility model has adopted following technical scheme: a kind of distribution power automation terminal, comprise dsp processor, the signal input part of dsp processor links to each other with voltage transformer, current transformer and switching value input circuit respectively, the signal output part of dsp processor links to each other with relay, the signal input output end of dsp processor is by W5100 chip access network based on ethernet, and dsp processor links to each other with storage card.

As shown from the above technical solution, the utility model adopts dsp processor as CPU, in conjunction with analog switch, can finish accurate measurement to multichannel three-phase voltage, three-phase current, to the monitoring of various pulsed quantities and quantity of state, it is fast to have processing speed, the certainty of measurement height, volume is little, maintenance, maintenance difficulties is low, the reliability height, and cost is low, effectively reduce the investment of whole system, tangible economic benefit is arranged.The utility model uses the inside FLASH of dsp processor and storage card to store the parameter that the First Astronautic Research Institute for Measurement and Test needs, and has prevented that effectively external memory storage EEPROM from owing to the problem that loss of data brought, further having improved the reliability of terminal.

Description of drawings

Fig. 1 is a circuit block diagram of the present utility model;

Fig. 2 is the circuit block diagram of sampling channel expansion among Fig. 1.

Embodiment

A kind of distribution power automation terminal, comprise dsp processor, the signal input part of dsp processor links to each other with voltage transformer, current transformer and switching value input circuit respectively, the signal output part of dsp processor links to each other with relay, the signal input output end of dsp processor is by W5100 chip access network based on ethernet, dsp processor links to each other with storage card, as shown in Figure 1.Described dsp processor peripheral power supply management module, watchdog module, active crystal oscillator module.

As shown in Figure 1, described dsp processor adopts TMS320F28335 chip 1, and it is the microprocessor of a 32-bit, and its maximum clock can reach 150MHz, has 32 data/address bus.Voltage transformer, current transformer link to each other with A/D converter by analog switch, and A/D converter links to each other with TMS320F28335 chip 1, and the GPIO mouth of TMS320F28335 chip 1 links to each other with analog switch; Described switching value input circuit links to each other with buffer by photoelectric isolating circuit, and buffer meets the data/address bus DB0 to DB15 of TMS320F28335 chip 1, and the GPIO mouth of TMS320F28335 chip 1 links to each other with relay by photoelectric isolating circuit; The DC quantity testing circuit couples ADCIN0 to the ADCIN7 mouth of TMS320F28335 chip 1 by linear light; The SCIB serial ports of TMS320F28335 chip 1 is the RS485 port, and the SCIC serial ports of TMS320F28335 chip 1 is the RS232 port, and the serial peripheral equipment interface SPI of TMS320F28335 chip 1 connects the SD storage card.The I of described TMS320F28335 chip 1 ²The C mouth connects eeprom memory and clock chip.

Behind 4 road voltages process voltage transformer pt and 18 road electric currents process current transformer CT, at first switch by the general purpose input/output port GPIO of analog switch in conjunction with TMS320F28335 chip 1, enter MAX11046 chip 2, the result that will change gives TMS320F28335 chip 1 then; 8 tunnel DC quantity detection signals are connected to the MAX11046 chip 2 of TMS320F28335 chip 1 through linear optical coupling; The variable connector amount is connected to the data/address bus of TMS320F28335 chip 1 then through buffer after photoelectricity is isolated; The general purpose input/output port GPIO of TMS320F28335 chip 1 is through the disconnection or the adhesive of photoelectricity isolated controlling relay; TMS320F28335 chip 1 is finished ethernet communication through network chip W5100 chip; The serial communication interface SCIB of TMS320F28335 chip 1 and SCIC realize RS485 and RS232 communication through level transferring chip; The serial peripheral equipment interface SPI of TMS320F28335 chip 1 is connected to mass storage SD storage card; The internal integrated circuit I of TMS320F28335 chip 1 ²The C bus is connected with clock chip with the exterior storage chip EEPROM that is used for the storage computation parameter respectively.

As Fig. 1, shown in 2, data/address bus DB0 to the DB15 mouth of described TMS320F28335 chip 1 connects A/D converter, described A/D converter adopts MAX11046 chip 2, described analog switch comprises first, two, three, four, five, six analog switches, the general purpose input/output port GPIO0 of the startup switched pins CONVST of described MAX11046 chip 2 and TMS320F28335 chip 1, the general purpose input/output port GPIO2 of TMS320F28335 chip 1, GPIO3, the GPIO4 mouth links to each other with three or eight decoders, three or eight decoders divide three tunnel outputs, one the tunnel and first, two analog switches link to each other, the one the tunnel and the 3rd, four analog switches link to each other, another Lu Yudi five, six analog switches link to each other.

Be set with 24 tunnel analog signals through 6 analog switches, control the output of three or eight decoders 3 by the general purpose input/output port GPIO2 to GPIO4 of software control TMS320F28335 chip 1, to control the logic control pin of each analog switch, thereby finish from 24 tunnel analog signals and switch to 8 road signals (ADC CH0-ADC CH7), 8 road signals after will switching then (ADC CH0-ADC CH7) enter the MAX11046 chip 2 of 8 passages and sample, MAX11046 chip 2 is 8 passages, 16 bit synchronization analog-digital converters, link to each other with adopting parallel bus between the TMS320F28335 chip 1, general purpose input/output port GPIO0 with TMS320F28335 chip 1 is configured to pulsewidth conditioning function ePWM simultaneously, controls the startup switched pins CONVST of MAX11046 chip 2.

Claims

1. distribution power automation terminal, it is characterized in that: comprise dsp processor, the signal input part of dsp processor links to each other with voltage transformer, current transformer and switching value input circuit respectively, the signal output part of dsp processor links to each other with relay, the signal input output end of dsp processor is by W5100 chip access network based on ethernet, and dsp processor links to each other with storage card.

2. distribution power automation terminal according to claim 1, it is characterized in that: described dsp processor adopts TMS320F28335 chip (1), voltage transformer, current transformer link to each other with A/D converter by analog switch, A/D converter links to each other with TMS320F28335 chip (1), and the GPIO mouth of TMS320F28335 chip (1) links to each other with analog switch; Described switching value input circuit links to each other with buffer by photoelectric isolating circuit, and buffer meets the data/address bus DB0 to DB15 of TMS320F28335 chip (1), and the GPIO mouth of TMS320F28335 chip (1) links to each other with relay by photoelectric isolating circuit; The DC quantity testing circuit couples TMS320F28335 chip (1) ADCIN0 to ADCIN7 mouth by linear light; The SCIB serial ports of TMS320F28335 chip (1) is the RS485 port, and the SCIC serial ports of TMS320F28335 chip (1) is the RS232 port, and the serial peripheral equipment interface SPI of TMS320F28335 chip (1) connects the SD storage card.

3. distribution power automation terminal according to claim 1 is characterized in that: described dsp processor peripheral power supply management module, watchdog module, active crystal oscillator module.

4. distribution power automation terminal according to claim 2 is characterized in that: the I of described TMS320F28335 chip (1) ²The C mouth connects eeprom memory and clock chip.

5. distribution power automation terminal according to claim 2, it is characterized in that: data/address bus DB0 to the DB15 mouth of described TMS320F28335 chip (1) connects A/D converter, described A/D converter adopts MAX11046 chip (2), described analog switch comprises first, two, three, four, five, six analog switches, the general purpose input/output port GPIO0 of the startup switched pins CONVST of described MAX11046 chip (2) and TMS320F28335 chip (1), the general purpose input/output port GPIO2 of TMS320F28335 chip (1), GPIO3, the GPIO4 mouth links to each other with three or eight decoders, three or eight decoders divide three tunnel outputs, one the tunnel and first, two analog switches link to each other, the one the tunnel and the 3rd, four analog switches link to each other, another Lu Yudi five, six analog switches link to each other.