CN100395783C

CN100395783C - Automatic collector for cathode protection potential data at microconsumption station

Info

Publication number: CN100395783C
Application number: CNB200510114259XA
Authority: CN
Inventors: 刘军; 兰翔; 陈强; 吴玲
Original assignee: China Petroleum and Natural Gas Co Ltd
Current assignee: China Petroleum and Natural Gas Co Ltd
Priority date: 2005-10-25
Filing date: 2005-10-25
Publication date: 2008-06-18
Anticipated expiration: 2025-10-25
Also published as: CN1956020A

Abstract

An automatic collector of protection potential data on micropower cathode is prepared as connecting two ends of stabilized-integrated chip U6 in power supply unit separately to VDD port of CPU and 3.6V Li cell, connecting A and B ports of active filtering chip U5 separately to relevant port of CPU and signal port, connecting SCL and SDA ports of storage chip U4 separately to relevant ports of CPU, connecting radio communication chip U2 to relevant ports of CPU through four ports, connecting transceive and mode control pin to relevant ports of CPU and connecting state output AM and DR to I / O pins of CPU.

Description

Automatic collector for cathode protection potential data at microconsumption station

Technical field:

The present invention relates to a kind of automatic collector for cathode protection potential data at microconsumption station that is applied to test the long-distance transport pipes cathodic protection potential, can under little power consumption condition, carry out the automatic judgement and the detection of cathodic protection energising current potential, switch-off potential on the long distance pipeline.

Background technology:

The collection of cathodic protection potential both domestic and external has following several method:

1, gather the energising current potential:

The artificial collection: hand-held multimeter of patrolman and contrast electrode, to each detective pole pointwise line walking admission, generally be one month once, each test point can only be gathered data at every turn.Domestic this mode that generally adopts at present, owing to had only data in one month, data volume is unfavorable for accurate analysis conduit cathode protection condition very little.

Automatically gather: adopt solar cell as power supply, with the automatic collection of chip microcontroller cathodic protection energising current potential.Cost is higher, is difficult to when being installed in field condition simultaneously safeguard, suffers artificial damage easily, therefore is difficult to apply.

2, gather switch-off potential:

The artificial collection: cooperate synchronous cutout, hand-held multimeter of patrolman and contrast electrode to each detective pole pointwise line walking admission, manually carry out estimating of switch-off potential value and read.Line walking of each test point only can collect data, submits the more serious place of flow disturbance at pipeline, the numerical value of switch-off potential estimate read inaccurate.

Automatically gather: adopt DC voltage gradient measuring technology (DCVG) to cooperate synchronous cutout, can pointwise detect the switch-off potential of pipeline.This equipment relies on import substantially, and cost is higher, and needs the professional to operate, and line walking of each test point only can collect data.

Summary of the invention:

The purpose of this invention is to provide a kind of simple to operate, cost is lower, installation and maintenance long distance pipeline automatic collector for cathode protection potential data at microconsumption station easily; can under little power consumption condition, carry out the automatic judgement and the detection of cathodic protection energising current potential, switch-off potential on the long distance pipeline; so that a large amount of basic datas to be provided, be convenient to the cathode protection condition of accurate analysis conduit.

The object of the present invention is achieved like this:

This little power consumption cathodic protection potential collector mainly is made up of 4 parts:

1, active filter system: adopt little power consumption amplifier to form active filter system, eliminate the influence that pipeline is submitted flow disturbance.

2, power-supply system: adopt long-acting lithium battery to provide power supply to total system, the lithium battery of one 2 ampere-hour reaches 15 years normal serviceable life.

3, data handling system: adopt ultra low-power microcontroller as CPU, be responsible for A/D conversion, collection, the storage of data.

4, data communication system: adopt the micro power consumption wireless transceiving chip, finish the transmitted in both directions of data.

Power unit adopts integrated voltage stabilizing chip U6P4NX one end to be connected with the vdd terminal mouth of center control chip CPU, and the other end is connected with the long-acting lithium battery of 3.6V, the 2.8V DC voltage that provides whole collector to need; Adopt clock chip U3P8563, be connected to the CPU corresponding ports, system clock is provided by port SCL, SDA0, INT0; The B group port of active power filtering chip U5MAX4471 is connected to the CPU corresponding ports, and A group port is connected with signal port, after the electric potential signal input on the pipeline, behind the active power filtering that process U5 forms, imports CPU more earlier; The SCL of storage chip U4AT24LW64, SDA1 port are connected with the CPU corresponding ports, the storage data; Wireless telecommunications chip U2P89LPC933 is connected with the CPU corresponding ports by SPI, SCK, SCN, MISO, MOSI port, carry out communication, its transmitting-receiving is connected with pattern control pin TRX-CE, TX-EN, POW-UP and CPU corresponding ports, its state output AM, DR link the I/O pin of CPU, detect.CPU is responsible for judgement, the collection of data, and the control wireless data transceiving.

Electric potential signal on the long distance pipeline by signal filtering after, be input to and analyze in the ultra low-power microcontroller and judge, select valid data and store.After ultra low-power microcontroller receives instruction, data are transferred out by the micro power consumption wireless communication.Adopt lithium battery to make power supply, use little power consumption technology, can reduce the device hardware cost greatly.Finished-product volume is very little simultaneously, can be installed in the existing detective pole, is convenient to installation and maintenance.Collector adopts potential differentiation the switch on automatic collection and the judgement of current potential and switch-off potential, need not manually-operated, use simple.

Use lithium battery to make little power consumption collector of power supply, can judge and gather the energising current potential and the switch-off potential of pipeline cathode protection automatically, cost is lower.Volume is small and exquisite, can be installed in the existing cathodic protection potential detective pole, and easy for installation, it is convenient to safeguard.And use simply, do not need the professional to operate, tally with the national condition.Look into newly by science and technology, also do not have the product of identical function at present both at home and abroad.

In May, 2004, this achievement was passed through the examination of China National Petroleum and Pipeline Company.Require all long defeated metallic conduits must adopt cathodic protection according to national standard, so this achievement have boundless application prospect and important practical sense with burying.Be convenient to understand and grasp exactly the moon guarantor actual state of remote pipeline; cathodic protection management level have been improved at the labour oil and gas pipes; for the efficient that improves cathodic protection; improve cathode protection measure; prolong pipeline serviceable life to greatest extent; the operation of guarantee pipe safety has very positive meaning.

Description of drawings:

Fig. 1 automatic collector for cathode protection potential data at microconsumption station structural representation.

Fig. 2 automatic collector for cathode protection potential data at microconsumption station partial circuit figure.

Fig. 3 automatic collector for cathode protection potential data at microconsumption station partial circuit figure.

Fig. 4 automatic collector for cathode protection potential data at microconsumption station partial circuit figure.

Embodiment:

Power unit:

Power unit is made up of R8, R9, BT1, CA2, CA3, U6, DB1; 1) R8, R9 constitute a bleeder circuit, and R8, R9 parallel connected end are connected with the AD11 of CPU, and the R9 other end is connected with BT1 is anodal with 1 port of U6, gathers the cell voltage state;

2) BT1 is one 3.6 volts a long-acting lithium battery, and an end is connected with 1 port of U6, and the other end is connected with 2 ports of U6, is responsible for powering to total system;

3) U6 adopts integrated voltage stabilizing chip P4NX, is a low pressure reduction, power supply chip efficiently, for system provides 2.8 volts of reliable and stable power supplys, and provides benchmark for AD;

4) CA2, CA3 are the front and back end filter capacitor of power supply chip U6 requirement, and the end of the two is connected with 1,5 ports of U6 respectively, and the other end is connected with the negative pole VSS of BT1;

5) DB1 is one group of bouncing pilotage, and 1 port is connected with 5 ports of U6, and 2 ports are connected with power end VDD, is used for conveniently carrying out the ICP programming to CPU.

The real-time clock part:

Real-time clock part is made up of C14, C15, C16, X2, U3, and pass through SCK, SDA ,/INT is connected with CPU.

1) U3 is the real-time timepiece chip P8563 of a ultralow energy of PHLIP company, and it mainly is for system provides real-time clock signal, and regularly CPU is waken up.

2) X2 is the clock oscillator of standard, and for P8563 provides pulse signal, an end is connected with 1 port of U3, and the other end is connected with 2 ports of U3.

3) C16 is connected to the power end of P8563, as the decoupling capacitor of P8563.

4) C14, C15 are the load capacitances of X2, are connected back ground connection with the two ends of X2.

The CPU part

Being made up of CPU, PR1, C18, S1, is the main control part of system;

1) CPU adopts little power consumption P89LPC933, is responsible for controlling of total system;

2) PR1 is an exclusion, mainly is the pull-up resistor as the I2C interface, is connected with VCC;

3) C18 is connected to the power end of CPU, as the decoupling capacitor of CPU;

4) S1 is a high performance tongue tube, and wake up the outside that is used for CPU, is connected with port 3.

Signal port and lightning protection circuit

Signal port and lightning protection circuit are made of D1～D8, DB3, R3:

1) D1, D2, D3 be one group constitute over the ground, to power supply, signal is all formed the TBS pipe of lightning protection, in circuit, play the effect of preliminary leakage current;

2) R3 is the preliminary leadage circuit of the process current-limiting resistance of string in signal circuit later on, and its effect is that the subordinate's circuit to it carries out current-limiting protection under the situation that preliminary leadage circuit can not be released fully;

3) D4, D5, D6 be one group constitute over the ground, to power supply, to signal all punishment become the TBS pipe of lightning protection, they are behind current-limiting resistance, its effect is further leakage current and lightning voltage is dropped in the safety value;

4) D7, D8 are two volts stabilivolts, its effect be with too high direct current import-restriction in value to IC safety;

5) DB3 is one 2.54 line ball stand, is used for fixing signal wire.

The filtering part:

The filtering part is made of U5, R4, R5, R6, R7, C19, C20, C21, C22.And gather port by the AD10 that the OUTB pin of U5 is connected to CPU;

1) U5 adopts the MAX4471 chip, and the amplifier of a little power consumption, single supply is responsible for constituting the secondary low-pass filter circuit with peripheral circuit;

2) A of R5, R6, C19, C22 and amplifier group amplifier constitutes the prime low-pass filtering.R5, C19 constitute RC filtering, and R6, C22 constitute RC filtering and be connected with signal port;

3) B of R4, R7, C20, C21 and amplifier group amplifier constitutes the prime low-pass filtering.R4, C20 constitute RC filtering, and R7, C21 constitute RC filtering, are connected with the AD10 port of CPU.

The wireless telecommunications part:

Wireless telecommunications partly comprise U2, C8, C1, C2, R1, X1, C7, C5, C6, R2, C4, C9, C10, C11, L1, L2, L3, C3, C12, C13, E1, carry out communication by SPI, SCK, SCN, MISO, MOSI and CPU, its transmitting-receiving links to each other with CPU with pattern control pin TRX-CE, TX-EN, POW-UP.Its state output AM, DR also are that the I/O pin of linking CPU detects.

1) U2 is the low energy adjustable radio transmitting and receiving chip NRF905 of signal efficiently of the logical company of a news, by some simple capacitance resistance wares, adds that antenna just forms one and can receive the wireless system that can send out;

2) C8 is connected to the power end of IC, as its decoupling capacitor;

3) X1 is the crystal oscillator of a 16MHz, and clock pulse signal is connected with XC1, the XC2 port of U2 to be responsible for providing accurately to NRF905;

4) C1, C2, R1 are as the load device of crystal oscillator X1, and X1 is by R1, C1, C2 ground connection;

5) C7 is the filter capacitor of NRF905, and an end is connected other end ground connection with the DVDD-IV2 port;

6) C5, C6 one end are connected to positive supply, and other end ground connection is as the high frequency decoupling capacitor;

7) R2 is connected to the reference edge of NRF905, is the reference resistance that NRF905 requires;

8) C4 is a shunt capacitance of radiating portion, and an end is connected with the VDD_PA of U2, other end ground connection;

9) C9, C10, C11 are the matching capacitance of one group of high-frequency emission, are cascaded;

10) L1, L2, L3 are the coupling inductance of one group of high-frequency emission;

11) C12 is every the high electric capacity of low pass;

12) C3 is the radiating portion shunt capacitance;

13) C13 is the radiating portion shunt capacitance;

14) E1 is the antenna of 433MHz, is connected with the ANT2 port of U2 by capacitor C 13, C12, inductance L 2, capacitor C 9, C11, is connected with the ANT1 port of U2 by capacitor C 10.

System extension:

Storage chip adopts SCL, the SDA1 port of AT24LW64 to be connected with the CPU corresponding ports.

Claims

1. automatic collector for cathode protection potential data at microconsumption station, by active filter system,

Power-supply system, data handling system, data communication system constitute, and it is characterized in that:

Power unit adopts integrated voltage stabilizing chip P4NX one end to be connected with the vdd terminal mouth of CPU, and the other end is connected with the long-acting lithium battery of 3.6V, the 2.8V DC voltage that provides whole collector to need; Adopt clock chip P8563, be connected to the CPU corresponding ports, system clock is provided by port SCL, SDA0, INT0; The B group port of active power filtering chip MAX4471 is connected to the CPU corresponding ports, and A group port is connected with signal port, after the electric potential signal input on the pipeline, behind the active power filtering that process active power filtering chip MAX4471 forms, imports CPU more earlier; The SCL of storage chip AT24LW64, SDA1 port are connected with the CPU corresponding ports, the storage data; Wireless telecommunications chip P89LPC933 is connected with the CPU corresponding ports by SPI, SCK, SCN, MISO, MOSI port, carry out communication, its transmitting-receiving is connected with pattern control pin TRX-CE, TX-EN, POW-UP and CPU corresponding ports, its state output AM, DR link the I/O pin of CPU, detect, CPU is responsible for judgement, the collection of data, and the control wireless data transceiving.