CN109958880B - Valve pit monitoring system and monitoring method - Google Patents
Valve pit monitoring system and monitoring method Download PDFInfo
- Publication number
- CN109958880B CN109958880B CN201910232471.8A CN201910232471A CN109958880B CN 109958880 B CN109958880 B CN 109958880B CN 201910232471 A CN201910232471 A CN 201910232471A CN 109958880 B CN109958880 B CN 109958880B
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- module
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- circuit board
- valve pit
- integrated circuit
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/005—Protection or supervision of installations of gas pipelines, e.g. alarm
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
- F17D5/06—Preventing, monitoring, or locating loss using electric or acoustic means
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Prevention Of Electric Corrosion (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
- Pipeline Systems (AREA)
Abstract
The invention discloses a kind of valve pit monitoring systems, including server and RTU system, RTU system includes power supply, integrated circuit board and pressure sensor, CPU is provided on integrated circuit board, power interface, signaling interface, communication module, multiple AI modules and multiple AO modules, the power supply is connected by power supply line with power interface, the communication module is connected with server, the pressure sensor is connected by signal wire with signaling interface, the AI module and AO module in valve pit other sensors or actuator connect, the power interface, signaling interface, communication module, AI module is electrically connected with CPU with AO module.A kind of monitoring method is also disclosed, including detecting the gaseous-pressure signal in pipeline using pressure sensor and transmitting a signal to server, AI module and AO module is utilized to acquire pipeline cathodic protection current, current potential.The present invention prevents safety accident to the real time monitoring to pipeline pressure, and improves the service life of pipeline.
Description
Technical field
The present invention relates to monitoring system fields, and in particular to a kind of valve pit monitoring system and monitoring method.
Background technique
On fuel gas transmission pipeline, every a distance, a bite valve pit can be rapidly when there is accident maintenance need to set
The valve in the valve pit of the pipeline two sides where accident point is turned off, the combustion gas being vented rapidly in accident pipeline section is not needed whole section
Pipeline stops emptying.
In order to prevent gas supply pipe gas leakage and cause serious accident, monitoring system can be used and monitor in each valve pit
Gas pipe pressure, currently, the prior art about gas monitor and control includes the patent of invention application No. is 201810125008.9
Apply and application No. is 201810045930.7 applications for a patent for invention etc., can refer to Shen for the monitoring system of combustion gas valve pit
Please number utility model patent for being 201320288316.6, including monitoring unit, monitoring unit be connected with by cable connector
Battery pack, monitoring unit are also connected with GSM antenna；Monitoring unit is also connected with gas monitoring probe, gas monitoring probe packet
A flame proof metal shell is included, sensor is installed in the flame proof metal shell, sensor circumfusion epoxy resin, every
Ventilation fire retarding sheet is installed at the external port of quick-fried metal shell, sensor be located at ventilation fire retarding sheet, flame proof metal shell inner wall with
And in the space that surrounds of epoxy resin.It is in for a long time due to pipeline in the environment of humidity, is easy to be corroded, these existing prisons
Control system only has supervisory function bit, can not delay the corrosion rate of pipeline.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of valve pit monitoring system and monitoring methods, can not only be to each
Gas pipeline in a valve pit is monitored, additionally it is possible to be protected to gas pipeline, be slowed down the corrosion rate of pipeline, extension tube
The service life in road.
The technical proposal for solving the technical problem of the invention is: valve pit monitoring system, including server and setting
RTU system in each valve pit, the RTU system include power supply, integrated circuit board and pressure sensor, and the pressure passes
Sensor is mounted in fuel gas transportation pipeline and is connected with integrated circuit board,
CPU, power interface, signaling interface, communication module, multiple AI modules and more are provided on the integrated circuit board
A AO module, the power supply are connected by power supply line with power interface, and the communication module is connected with server, the pressure
Sensor is connected by signal wire with AI module, and the AI module and AO module are connected with cathodic protection execution unit, the yin
Pole protection execution unit is connect with the pipeline in valve pit, the power interface, signaling interface, communication module, AI module and AO mould
Block is connect with CPU.
Further, the signaling interface include RS485 interface, RS232 interface, the DI interface module including DI interface with
And the DO interface module including DO interface.
Further, the communication module includes bluetooth module, NB-IOT module and network communication module, the bluetooth
Module is connected with Bluetooth antenna, and NB-IOT module is connected with NB-IOT antenna.
Further, the Bluetooth antenna and NB-IOT antenna pass through Explosion proof joint and bluetooth module and NB-IOT mould respectively
Block is connected, and explosion-proof glue-line is coated with outside the Explosion proof joint, gelatin layer is coated with outside the explosion-proof glue-line.
Further, the power supply is battery.
It further, further include vertical installation cylinder, the installation cylinder includes lower cylinder and top cylinder, described
By lower end disc seal, top is provided with dismountable partition for the bottom of lower cylinder, and the top of the top cylinder passes through upper
End plate sealing, bottom is open, and the lower end cap of the top cylinder detachably connects outside the upper end of lower cylinder and with lower cylinder
It connects, RTU installation cavity is set as between the bottom plate and partition, battery installation cavity is set as between partition and upper head plate, it is described
The threading hole of connection RTU installation cavity and battery installation cavity is provided on partition, the bottom plate lower surface is provided with installs with RTU
The threading cylinder of chamber connection；The integrated circuit board is installed in RTU installation cavity, and battery is installed in battery installation cavity, and
The power supply line be connected to the battery runs through threading hole, and the signal wire being connected with integrated circuit board is through threading cylinder.
Further, memory is provided on the integrated circuit board, the memory is electrically connected with CPU.
The monitoring method of above-mentioned valve pit monitoring system, comprising the following steps:
A, pressure sensor is mounted in the pipeline in valve pit, by integrated circuit board be mounted in valve pit and with power supply phase
Even；
B, using the gaseous-pressure signal in pressure sensor detection pipeline, and gaseous-pressure signal is transmitted to integrated electricity
Gaseous-pressure data are transmitted to server by communication module by road plate, integrated circuit board；
C, after server receives gaseous-pressure data, the normal gaseous-pressure model of the gas pressure force value and setting that will test
It encloses and is compared, if the gas pressure force value detected is located at except normal gaseous-pressure range, sound an alarm；
D, cathode is provided to the pipeline in valve pit using the AO module control cathodic protection execution unit on integrated circuit board
Protective current utilizes the pipeline cathode protection electric current and potential data in AI module access valve pit.
Further, pressure sensor is every the gaseous-pressure in the pipeline of detection in 5 minutes, and integrated circuit board is every one
Hour to data of server transport.
Compared with prior art, the beneficial effects of the present invention are: pressure sensor can be in real-time detection gas pipeline
Pressure signal is simultaneously transmitted to integrated circuit board by gaseous-pressure, and pressure data is transmitted to server again by integrated circuit board, is realized
To the real time monitoring of pipeline pressure, when leaking air or blocking, it can find and be handled in time, prevent serious
Safety accident.Apply cathodic protection current to pipeline further, since being provided with cathodic protection circuit module, can be monitored in real time
Pipeline cathode protection situation, extends the service life of pipeline, and is conducive to gas transmission safety.
Detailed description of the invention
Fig. 1 is the schematic diagram of monitoring system of the present invention.
Fig. 2 is the circuit diagram of integrated circuit board of the present invention.
Fig. 3 is the schematic diagram of present invention installation cylinder.
Appended drawing reference: 1-lower cylinder；2-top cylinders；3-bottom plates；4-upper head plates；5-partitions；6-threading
Hole；7-threading cylinders；8-RTU installation cavitys；9-battery installation cavitys；10-boss；11-gaskets: 12-sealing shrouds；100
- power supply；200-integrated circuit boards；210—CPU；220-power interfaces；230-RS485 interfaces；240-RS232 interfaces；
250-DI interface modules；260-DO interface modules；270-AI modules；280-AO modules；290-memories；211-is blue
Tooth module；212-NB-IOT modules；213-network communication modules；300-pressure sensors.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples.
Valve pit monitoring system of the invention including server and is arranged in each valve pit as depicted in figs. 1 and 2
RTU system, server be used to receive all RTU system detections in a region to data and data are monitored, specifically
Ground, server can be existing conventional computer, and the real time data received can be shown on a display screen, and can judge number
According to whether normally, sounded an alarm when abnormal to inform staff.In addition, vertical data can also be stored in by server
It stores up in equipment, in order to which subsequent recall is checked.RTU system installs a set of RTU for acquiring and sending data in each valve pit
System, in order to be monitored to each valve pit, specifically, the RTU system includes power supply 100, integrated circuit board 200
And pressure sensor 300, the pressure sensor 300 are mounted in fuel gas transportation pipeline and are connected with integrated circuit board 200,
Pressure sensor 300 is used to detect the gaseous-pressure in gas pipeline, can decide whether to manage according to the pressure value of combustion gas
The concrete model of situations such as road gas leakage, line clogging, pressure sensor 300 can be XT-100.
Integrated circuit board 200 for receiving data, transmission data, power supply control etc., specifically, the integrated circuit board
CPU210, power interface 220, signaling interface, communication module, multiple AI modules 270 and multiple AO modules are provided on 200
280, the power supply 100 is connected by power supply line with power interface 220, and the communication module is connected with server, the pressure
Sensor 300 is connected by signal wire with AI module 270, and the AI module 270 and AO module 280 are connected with cathodic protection execution
Unit 400, the cathodic protection execution unit 400 are connect with the pipeline in valve pit, the power interface 220, signaling interface,
Communication module, AI module 270 are connect with CPU210 with AO module 280.
CPU210 uses existing CPU, and concrete model can be ARM.CORTEX-M4, and signaling interface includes input signal
Interface and output signal interface are used for outer signal transmission cable, realize the input of data and control the output of signal.Specifically
Ground, the signaling interface include RS485 interface 230, RS232 interface 240, the DI interface module 250 including DI interface and packet
Include the DO interface module 260 of DO interface.RS485 interface 230, RS232 interface 240, DI interface and DO interface are existing tool
Have using more extensive interface, quantity can be one, two, 3 etc., and pressure sensor 300 passes through cable and AI module
270 are connected, and for pressure signal to be transmitted to CPU210, remaining multiple interfaces are spare, Ke Yilian during upgrading in follow-up system
Connect other data sampling sensors or executive component.
Communication module is used for the wireless transmission of data, and specifically, the communication module includes bluetooth module 211, NB-IOT
Module 212 and network communication module 213, the bluetooth module 211 are connected with Bluetooth antenna, and NB-IOT module 212 is connected with
NB-IOT antenna.The pressure data that bluetooth module 211 can be will test by bluetooth is transmitted to neighbouring server, NB-IOT
Module 212 is protenchyma networking module, has wide coverage, the advantages such as power consumption is lower, and implementation cost is low.Network communication mould
Block 213 is with 2G communication, 3G communication and 4G communication function, it can be achieved that the remote transmission of data.When having implementation, according to
Specific requirements transmit gaseous-pressure using one of bluetooth module 211, NB-IOT module 212 and network communication module 213
Data, it is other spare.
Bluetooth module 211 and NB-IOT module 212 need antenna to carry out sending and receiving for data, in order to guarantee that antenna connects
The stability and reliability connect, the Bluetooth antenna and NB-IOT antenna pass through Explosion proof joint and bluetooth module 211 and NB- respectively
IOT module 212 is connected, and explosion-proof glue-line is coated with outside the Explosion proof joint, is coated with gelatin layer outside the explosion-proof glue-line, this
Packaged type can reinforce the package strength of antenna, prevent from leaking electricity, and guarantee the service life of antenna.
The quantity of AI module 270 can be 6, and the quantity of AO module 280 can be 2, and AI module 270 is outer for receiving
Portion's signal, AO module 280 are used to export the control signal of CPU210, and e.g., AO module 280 can be with the liquid level sensor in valve pit
It is connected, for monitoring the water level in valve pit in real time, CPU210 can send data by communication module, when water level is excessively high, management
Personnel can carry out drainage works in time.In addition, AO module 280 can also be connected with other combustion gas data monitoring elements, it is used for
Various detection datas after section.In addition, CPU210 of the invention can be sent by AO module 280 to cathodic protection execution unit 400
Signal is controlled, cathodic protection execution unit 400 is controlled as pipeline and cathodic protection current is provided, and AI module 270 can be with cut-in valve
Pipeline cathode protection electric current and point data in well, are monitored the size of cathodic protection current and current potential.By to pipe
Road applies cathodic protection current, pipeline can be prevented to be corroded, extend the service life of pipeline.
Power supply 100 provides electric energy for entire RTU system, can be using the alternating current of 220V as power supply, but needs to lead and set greatly
The electric wire of amount, implementation cost is high, inconvenient, and therefore, the power supply 100 is battery, specifically can be the lithium of 24V, 36A
Battery.
Memory 290 is provided on the integrated circuit board 200, the memory 290 is electrically connected with CPU210, can be incited somebody to action
Data are stored in memory 290, and the space of memory 290 can be met the requirements in 16M.
The monitoring method of above-mentioned valve pit monitoring system, including
A, pressure sensor 300 is mounted in the pipeline in valve pit, by integrated circuit board 200 be mounted in valve pit and with
Power supply 100 is connected；
B, the gaseous-pressure signal in pipeline is detected using pressure sensor 300, and gaseous-pressure signal is transmitted to collection
At circuit board 200, gaseous-pressure data are transmitted to server by communication module by integrated circuit board 200.Specifically, pressure passes
Sensor 300 is per the gaseous-pressure detected in a pipeline every other hour, and integrated circuit board 200 is per every other hour to server biography
A defeated data, pressure sensor 300 do not need continuously to monitor, and monitoring is primary at regular intervals, can significantly reduce
Power consumption makes to extend to 5 years or more the cruise duration of battery.
C, after server receives gaseous-pressure data, the normal gaseous-pressure model of the gas pressure force value and setting that will test
It encloses and is compared, if the gas pressure force value detected is located at except normal gaseous-pressure range, sound an alarm；
D, cathodic protection execution unit 400 is controlled to the pipeline in valve pit using the AO module 280 on integrated circuit board 200
Cathodic protection current is provided, accesses the pipeline cathode protection electric current and potential data in valve pit using AI module 270.
Since valve pit is arranged in underground, and leakproofness cannot be guaranteed, and often rain flows into valve pit, it is therefore necessary to
The waterproof measure of RTU system is carried out, in order to reach preferable waterproof effect, the present invention installs collection using vertical installation cylinder
At circuit board 200 and battery, as shown in figure 3, the installation cylinder includes lower cylinder 1 and top cylinder 2, the lower sleeve
The bottom of body 1 is sealed by bottom plate 3, and top is provided with dismountable partition 5, and the top of the top cylinder 2 passes through upper end
Plate 4 seals, and bottom is open, and the lower end cap of the top cylinder 2 is outside the upper end of lower cylinder 1 and detachable with lower cylinder 1
Connection, is set as RTU installation cavity 8 between the bottom plate 3 and partition 5, battery installation is set as between partition 5 and upper head plate 4
Chamber 9, the diameter of RTU installation cavity 8 are slightly larger than the width of integrated circuit board 200, guarantee that integrated circuit board 200 can be put into RTU peace
It behave affectedly 8, battery can be put by the diameter satisfaction of battery installation cavity 9.Connection RTU is provided on the partition 5
The threading hole 6 of installation cavity 8 and battery installation cavity 9,3 lower surface of bottom plate are provided with the threading being connected to RTU installation cavity 8
Cylinder 7；The integrated circuit board 200 is installed in RTU installation cavity 8, and battery is installed in battery installation cavity 9, and and electric power storage
The connected power supply line in pond runs through threading hole 6, and the signal wire being connected with integrated circuit board 200 is through threading cylinder 7.
The shape of lower cylinder 1 and top cylinder 2 is cylindrical, the shape adaptation with valve pit, facilitates the suitable position of selection
Installation lower cylinder 1 and top cylinder 2 are set, and since lower cylinder 1 and top cylinder 2 are detachably connected, does not need setting side
It opens the door, extra valve pit space will not be occupied, installation and maintenance can be facilitated.
Lower cylinder 1 and top cylinder 2 can be the various metal materials such as aluminium alloy, iron material matter, copper alloy, due to valve pit
It inside often intakes, easily corrodes lower cylinder 1 and top cylinder 2, therefore, lower cylinder 1 as a preferred technical solution,
It is stainless steel cylinder with top cylinder 2, and the inner and outer wall of lower cylinder 1 and top cylinder 2 is coated with anti-corrosion paint layer.No
The steel that becomes rusty is corrosion-resistant, and after coating anti-decaying paint, is able to extend the service life of lower cylinder 1 and top cylinder 2.
In order to prevent RTU installation cavity 8 and the water inlet of battery installation cavity 9 and lead to monitoring system short circuit, scaling loss etc., lower cylinder
1 is threadedly coupled with top cylinder 2, and being threadedly coupled has certain leakproofness, and since the lower end cap of top cylinder 2 is in lower part
It, can be along the outer of top cylinder 2 when extraneous rainwater enters valve pit and flow to top 2 surface of cylinder outside the upper end of cylinder 1
Wall flows to the outer wall of lower cylinder 1, then flow to the bottom of lower cylinder 1, and threading cylinder 7 has certain length, can
Prevent rainwater from entering lower cylinder 1 along the inner cavity of threading cylinder 7, rainwater can drop on ground, guarantee higher leakproofness,
Waterproof performance is good.In order to further improve waterproofness, the inner wall of the top cylinder 2 is provided with the boss 10 of annular, described
The lower surface of boss 10 is provided with gasket 11, and the upper surface of the lower cylinder 1 compresses gasket 11, threads and set in cylinder 7
It is equipped with the material that sealing shroud 12, gasket 11 and sealing shroud 12 have certain elasticity using rubber etc., sealing shroud 12 and cable are tight
Contiguity touching, can be enhanced sealing effect.
Partition 5 can be used existing various mounting means and detachably install, it is preferred that the partition 5 is installed by screw
In lower cylinder 1, easy disassembly, implementation cost is low, and installation is stablized.
The threading hole 6 and threading cylinder 7 be it is multiple, multiple threading holes 6 are located at the different location of partition 5, multiple threading
Cylinder 7 is located at the different location of lower cylinder 1, and in construction, construction personnel can according to need the threading of selection suitable position
Hole 6 and threading cylinder 7, to facilitate construction, meanwhile, when number of cables is more, 6 He of threading hole can be used more flexiblely
Cylinder 7 is threaded, the cabling requirement of cable is met.
Claims (7)
1. valve pit monitoring system, including server and the RTU system being arranged in each valve pit, the RTU system includes electricity
Source (100), integrated circuit board (200) and pressure sensor (300), the pressure sensor (300) are mounted on fuel gas transmission
It is connected in pipeline and with integrated circuit board (200), which is characterized in that
CPU (210), power interface (220), signaling interface, communication module, multiple is provided on the integrated circuit board (200)
AI module (270) and multiple AO modules (280), the power supply (100) are connected by power supply line with power interface (220), institute
It states communication module to be connected with server, the pressure sensor (300) is connected by signal wire with AI module (270), the AI
Module (270) and AO module (280) are connected with cathodic protection execution unit (400), the cathodic protection execution unit (400) with
Pipeline connection in valve pit, the power interface (220), signaling interface, communication module, AI module (270) and AO module (280)
It is connect with CPU (210)；
The power supply (100) is battery；
It further include vertical installation cylinder, the installation cylinder includes lower cylinder (1) and top cylinder (2), the lower sleeve
The bottom of body (1) is sealed by bottom plate (3), and top is provided with dismountable partition (5), the top of the top cylinder (2)
It is sealed by upper head plate (4), bottom is open, and the lower end cap of the top cylinder (2) is outside the upper end of lower cylinder (1) and under
Portion's cylinder (1) is detachably connected, and is set as RTU installation cavity (8) between the bottom plate (3) and partition (5), partition (5) with it is upper
It is set as between end plate (4) battery installation cavity (9), connection RTU installation cavity (8) and battery installation is provided on the partition (5)
The threading hole (6) of chamber (9), bottom plate (3) lower surface are provided with the threading cylinder (7) being connected to RTU installation cavity (8)；Institute
It states integrated circuit board (200) to be installed in RTU installation cavity (8), battery is installed in battery installation cavity (9), and and battery
Connected power supply line runs through threading hole (6), and the signal wire being connected with integrated circuit board (200) is through threading cylinder (7).
2. valve pit monitoring system according to claim 1, which is characterized in that the signaling interface includes RS485 interface
(230), RS232 interface (240), the DI interface module (250) including DI interface and the DO interface module including DO interface
(260)。
3. valve pit monitoring system according to claim 1, which is characterized in that the communication module includes bluetooth module
(211), NB-IOT module (212) and network communication module (213), the bluetooth module (211) are connected with Bluetooth antenna,
NB-IOT module (212) is connected with NB-IOT antenna.
4. valve pit monitoring system according to claim 3, which is characterized in that the Bluetooth antenna and NB-IOT antenna difference
It is connected by Explosion proof joint with bluetooth module (211) and NB-IOT module (212), antiexplosion adhesive is coated with outside the Explosion proof joint
Layer, the explosion-proof glue-line are coated with gelatin layer outside.
5. valve pit monitoring system according to claim 1, which is characterized in that be provided on the integrated circuit board (200)
Memory (290), the memory (290) are electrically connected with CPU (210).
6. using the monitoring method of valve pit monitoring system described in claim 1 to 5 any one claim, which is characterized in that
Including
A, pressure sensor (300) is mounted in the pipeline in valve pit, by integrated circuit board (200) be mounted in valve pit and with
Power supply (100) is connected；
B, using the gaseous-pressure signal in pressure sensor (300) detection pipeline, and gaseous-pressure signal is transmitted to integrated
Gaseous-pressure data are transmitted to server by communication module by circuit board (200), integrated circuit board (200)；
C, after server receives gaseous-pressure data, the normal gaseous-pressure range of the gas pressure force value and setting that will test into
Row compares, if the gas pressure force value detected is located at except normal gaseous-pressure range, sounds an alarm；
D, using AO module (280) control cathodic protection execution unit (400) on integrated circuit board (200) to the pipe in valve pit
Road provides cathodic protection current, utilizes the pipeline cathode protection electric current and potential data in AI module (270) access valve pit.
7. the monitoring method of valve pit monitoring system as claimed in claim 6, which is characterized in that pressure sensor (300) is every 5
Gaseous-pressure in pipeline of minute detection, integrated circuit board (200) is per every other hour to data of server transport.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910232471.8A CN109958880B (en) | 2019-03-26 | 2019-03-26 | Valve pit monitoring system and monitoring method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910232471.8A CN109958880B (en) | 2019-03-26 | 2019-03-26 | Valve pit monitoring system and monitoring method |
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| CN109958880B true CN109958880B (en) | 2019-10-18 |
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| CN110570630A (en) * | 2019-08-08 | 2019-12-13 | 深圳市燃气集团股份有限公司 | NB-IoT-based gas valve well early warning device and early warning method |
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| CN204213644U (en) * | 2014-11-03 | 2015-03-18 | 石家庄新奥燃气有限公司 | Urban Pipeline Carrying Natural Gas cathodic protection remote collecting device |
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| CN101255952A (en) * | 2007-03-01 | 2008-09-03 | 中国石油天然气股份有限公司 | Test system for monitoring pipe leakage and early warning safety |
| JP2008281433A (en) * | 2007-05-10 | 2008-11-20 | Tokyo Gas Co Ltd | Method and apparatus for measuring/evaluating cathode corrosion condition of underground pipeline |
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