Cathode protection intelligent potential measuring instrument

Abstract

The utility model discloses a cathode protection intelligent potential measuring instrument, which comprises a lightning protection assembly, a measuring instrument main body and a battery compartment, the lightning protection assembly, the measuring instrument main body and the battery compartment are interconnected through aviation plug cables, and the three assemblies are respectively provided with an independent shell, so that a battery is convenient to replace; the volume is reduced by dividing into three parts, and the device can be put into the cathode protection test pile; the primary lightning protection and secondary lightning protection split design is adopted, so that the lightning protection performance is high, and the split integrated appearance design is convenient for engineers to install and maintain.

Description

Technical Field

[0001] The utility model belongs to the technical field of cathode protection and relates to an intelligent potential measuring instrument for cathode protection. Background Art

[0002] With the construction of more and more natural gas pipelines, people have paid enough attention to the control of partial corrosion of gas pipelines, and the leakage accidents caused by corrosion have become less and less; however, due to the lack of attention to the corrosion protection of gas pipelines in the station, system corrosion incidents in gas stations continue to occur, which has a great impact on the normal operation of the pipeline. People have also begun to realize that the significance of cathodic protection is becoming more and more important;

[0003] Buried metal pipelines are widely used in the transmission of oil, natural gas, drinking water, etc. Buried metal pipelines are buried underground for a long time, and due to different environments, they will suffer from varying degrees of corrosion. According to statistics, the direct economic losses caused by pipeline corrosion in my country account for about 3% to 4% of the national economic net output value each year. The corrosion, perforation, and leakage of buried pipelines not only cause oil and gas leakage, interrupt transportation, and cause huge economic losses, but also easily cause many safety problems and damage the environment. Therefore, the protection of pipelines is very important;

[0004] In view of the serious corrosion of buried metal pipelines, and the fact that most of the evaluation methods for cathodic protection in my country are manual inspections, with large measurement errors, incomplete data, and inconvenient viewing, a remote data acquisition system for cathodic protection of metal pipelines has been designed. A high-precision acquisition circuit has been designed to collect various cathodic protection parameters of buried oil and gas pipelines through 4G / NB remote transmission and send them back to the server. The data can be viewed on the server and the data can be comprehensively analyzed and processed to obtain the current protection status of the protected pipeline, providing an important basis for the protection of the pipeline.

[0005] There are four types of products on the market: 1. Manual measurement (consuming huge manpower, material resources, financial resources and time costs); 2. Only collecting the voltage and natural potential of the electrode connected to the pipeline. This measurement method lacks IR drop and the results are inaccurate; 3. The equipment needs an external AC and DC power supply. It can be powered by solar energy in the field, but it is not convenient to light in some places. Even in places with sufficient solar energy, it depends on the weather. If it is cloudy and rainy continuously, it will cause the equipment to be insufficient in power, the equipment will be intermittently online and offline, and the platform detection equipment will be sometimes available; 4. If it is powered by batteries, the equipment maintenance cost is high and it needs to be inspected or replaced every year;

[0006] In addition, the equipment is exposed to complex outdoor high-temperature, high-humidity environments. When unpacking and maintaining the equipment, environmental variables (such as temperature or humidity) can easily penetrate into the equipment, causing it to malfunction. Utility Model Content

[0007] The utility model aims to provide a cathode protection intelligent potential measuring instrument, which solves the problems of cumbersome battery replacement, inconvenient installation, great interference from external AC and DC environments, and poor lightning protection effect of existing measuring equipment.

[0008] The technical solution adopted by the utility model is that the cathodic protection intelligent potential measuring instrument comprises a lightning protection component, a measuring instrument body and a battery compartment, and the lightning protection component, the measuring instrument body and the battery compartment are all interconnected through an aviation plug cable.

[0009] The utility model is also characterized in that:

[0010] The lightning protection component includes a primary lightning arrester and a secondary lightning arrester. The secondary lightning arrester is located in the measuring instrument body, and the equipment cable is connected to the measuring instrument body through the primary lightning arrester and the secondary lightning arrester in turn;

[0011] The cathodic protection intelligent potential measuring instrument also includes independent shells corresponding to the lightning protection component, the measuring instrument body and the battery compartment, and a waterproof and dustproof unit is provided between each shell;

[0012] The independent shell of the measuring instrument body includes a main shell, the integrated circuit board of the measuring instrument body is embedded in the main shell, the two ends of the shell are respectively embedded with a front cover plate and a rear cover plate, the front cover plate is provided with a GPS antenna seat, and the front cover plate and the rear cover plate are respectively provided with a plurality of aviation plugs;

[0013] The independent housing of the lightning protection component includes a main housing A, in which the primary lightning arrester is arranged, and the front cover A and the rear cover A are embedded at both ends of the main housing A. The front cover A and the rear cover A are respectively provided with waterproof connectors, which are used to connect the secondary lightning arrester and the measuring instrument body;

[0014] The independent housing of the battery compartment includes a battery tube body, the battery is embedded in the battery tube body, a battery tube cover is embedded in the opening of the battery tube body, and a waterproof connector A connected to the battery is connected to the battery tube cover;

[0015] The measuring instrument body includes a minimum system unit, an external communication unit, an analog measurement unit and a power supply unit;

[0016] The external communication unit and the analog measurement unit are interconnected with the minimum system unit, and the power supply unit is connected with the minimum system unit and the battery compartment respectively;

[0017] The smallest system unit includes MCU, clock / RTC, storage device FLASH / EEPROM, and multiple peripheral interface expansion chips;

[0018] RTC is a real-time clock chip, which is connected to the MCU through the IIC bus;

[0019] Storage FLASH / EEPROM, connected to MCU via IIC bus;

[0020] IO / UART expansion chip, one side is connected to the MCU through the IIC bus, and the other side is connected to the peripherals through the UART bus;

[0021] The external communication unit includes a communication unit, a GNSS positioning unit and a debugging console port; the communication unit is connected to the MCU via a UART interface; the GNSS positioning unit is connected to the MCU via a UART bus;

[0022] The communication unit includes a 4G communication unit or a Lora communication unit or a WiFi communication unit or a Beidou 3 short message communication unit;

[0023] The analog measurement unit includes 3 potential measurement units and 2 current test units;

[0024] The three potential measurement units include the DC voltage of the on-off potential, the AC induced voltage of the off-power potential and the DC voltage of the natural potential;

[0025] 2 current test units including AC current and DC current;

[0026] One end of the potential measurement unit is connected to the MCU or expansion chip via UART / SPI, and the other end is connected to the potential measurement line. There are 4 lines in the potential measurement unit: pipeline, reference electrode, natural potential, and power-off potential.

[0027] One end of the current test unit is connected to the MCU through ADC, and the other end is connected to the reference current test line. There are two wires in the current test unit, namely the AC current and the reference electrode;

[0028] The power supply unit includes a battery protection unit and various levels of DCDC / LDO boost and buck units;

[0029] The battery protection unit is connected to the battery compartment and the DCDC / LDO boost and buck units at all levels behind it;

[0030] The power pins of each level of the DCDC / LDO boost and buck units at the subsequent stages of the docking equipment.

[0031] The beneficial effects of the utility model are:

[0032] The cathodic protection intelligent potential measuring instrument of the utility model adopts an independent split design for each device, which is divided into three parts: a lightning protection component, a measuring instrument body and a battery compartment; it has the following advantages: 1. It is convenient to replace the battery; 2. It is divided into three parts to reduce the volume and can be placed inside the cathodic protection test pile; 3. It is divided into primary and secondary lightning protection split designs, with high lightning protection performance and can also prevent the electromagnetic radiation impact of lightning directly on the measuring instrument body; 4. Due to its small size, it is very convenient to install and maintain. The power supply adopts a lithium-manganese dioxide battery (Li MnO2) power supply method, and 3 to 4 lithium-manganese dioxide batteries (Li MnO2) ER34615M (power type) in series / parallel are used to power the equipment; after the low power consumption design, the equipment can last for 3 to 5 years when collecting twice and uploading twice a day; 5. The split integrated appearance design is convenient for engineering personnel to install and maintain, and can reach the IP66 level, which greatly increases the reliability and stability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a structural diagram of the main components of the cathodic protection intelligent potential measuring instrument of the utility model;

[0034] Figure 2 It is a schematic diagram of component connection of the cathodic protection intelligent potential measuring instrument of the utility model;

[0035] Figure 3 This is a diagram showing the actual installation effect of the cathodic protection test pile and the measuring instrument in the cathodic protection intelligent potential measuring instrument of the utility model;

[0036] Figure 4 This is a working flow chart of the cathodic protection intelligent potential measuring instrument of the utility model;

[0037] Figure 5 This is a DC voltage measurement scheme diagram in the cathodic protection intelligent potential measuring instrument of the utility model;

[0038] Figure 6 This is a diagram of the AC voltage measurement scheme in the cathodic protection intelligent potential measuring instrument of the utility model;

[0039] Figure 7 This is a current measurement scheme diagram of the cathodic protection intelligent potential measuring instrument of the utility model;

[0040] Figure 8 It is a schematic diagram of the simulation measurement process in the cathodic protection intelligent potential measuring instrument of the utility model;

[0041] Fig. 9 It is a structural schematic diagram of an independent housing of a measuring instrument main body in the cathodic protection intelligent potential measuring instrument of the utility model;

[0042] Fig.10It is a structural schematic diagram of an independent housing of a lightning protection component in the cathodic protection intelligent potential measuring instrument of the utility model;

[0043] Fig.11 The utility model is a schematic diagram of the structure of the independent shell of the battery compartment in the cathode protection intelligent potential measuring instrument.

[0044] In the figure, 1. main shell, 2. front cover, 3. rear cover, 4. GPS antenna seat, 5. integrated circuit board of the measuring instrument body, 6. aviation plug, 7. main shell A, 8. primary lightning arrester, 9. front cover A, 10. rear cover A, 11. waterproof connector, 12. battery tube body, 13. battery, 14. battery tube cover, 15. waterproof connector A. DETAILED DESCRIPTION

[0045] The utility model is described in detail below with reference to the accompanying drawings and specific implementation modes.

[0046] The utility model provides a cathode protection intelligent potential measuring instrument, which is mainly composed of three parts: a lightning protection component, a measuring instrument body and a battery compartment. It solves the problems of existing measuring instruments such as inconvenient field power supply, intermittent solar energy, complicated battery replacement steps, cumbersome operation, frequent battery replacement, inconvenient field installation, the need to carry many fragmentary original parts or structural parts, the need for on-site data collection and system maintenance, great interference from external AC and DC environments, and poor lightning protection effect.

[0047] Example 1

[0048] like Figure 1 and Figure 2 As shown, the cathodic protection intelligent potential measuring instrument of the utility model mainly includes the following units:

[0049] 1. The minimum system unit includes MCU, clock / RTC (optional), storage device FLASH / EEPROM, and peripheral interface expansion chips;

[0050] MCU is the brain of the device, a single-chip microcomputer that can process the acquired data according to the needs and send it to the target unit through the external interface. MCU has various interface resources such as IIC\UART\SPI\IO\RGMII, etc.

[0051] RTC is a real-time clock chip connected to the MCU via IIC or SPI bus;

[0052] The storage FLASH / EEPROM is connected to the MCU via IIC or SPI bus, and is used to store the data processed by the MCU into the unit and retrieve it when needed;

[0053] IO / UART expansion chip, which is connected to the MCU through IIC or UART bus, and the other side is connected to the peripherals through UART or IO bus. When the MCU interface resources are insufficient and the speed requirement for the expansion interface is not high, the expansion chip is used to enhance the resource scalability of the MCU;

[0054] 2. External communication units include 4G communication unit / Lora communication unit / WiFi communication unit / Beidou III short message communication unit (wireless communication defaults to 4G), GNSS positioning and RS232 / RS485;

[0055] 4G communication unit / Lora communication unit / WiFi communication unit / Beidou 3 short message communication unit. The above four communication units are wireless communication units, and their main function is to serve as channels for information interaction between the device and the platform.

[0056] RS232 / UART communication unit, RS232 is a debugging serial port for on-site maintenance personnel to use. Its function is to connect to a handheld reader or PC to read instrument data through this interface;

[0057] GNSS unit, whose function is to locate the position of the device;

[0058] The 4G communication unit / Lora communication unit / WiFi communication unit / Beidou III short message communication unit is connected to the MCU or expansion chip. By default, the 4G communication unit is connected to the MCU through the UART interface;

[0059] The RS232 / UART communication unit is connected to the MCU or expansion chip via the UART bus;

[0060] The GNSS positioning unit is connected to the MCU or expansion chip via the UART bus;

[0061] 3. The analog measurement unit includes three potential measurement units (DC voltage of on-off potential, AC induced voltage of off-power potential and DC voltage of natural potential) and two current test units (AC current and DC current);

[0062] The function of the potential measurement unit is to test the AC and DC voltages of the on / off potential and the natural potential. The potential measurement unit is connected to the MCU or expansion chip via UART / SPI.

[0063] The other end is connected to the potential measurement line, which contains 4 wires: pipeline, reference electrode, natural potential, and power-off potential;

[0064] The current test unit is connected to the MCU through ADC, and the other end is connected to the reference current test line, which contains two wires, namely the AC current and the reference electrode;

[0065] 4. The power supply unit includes a battery protection unit and various levels of DCDC / LDO boost or buck units; the battery protection unit is used to protect the battery from short circuit and reverse high voltage shock, and the various levels of DCDC / LDO boost or buck units have the function of supplying power to various levels of the equipment;

[0066] The battery protection unit is connected to the ER34615 battery in the battery compartment and the subsequent DCDC / LDO boost or buck units at all levels;

[0067] Each level of DCDC / LDO boost or buck unit, and the power pins of each level of units of the subsequent docking equipment;

[0068] 5. The appearance structure unit includes IP66 waterproof and dustproof design, split design: independent appearance design of lightning arrester + measuring instrument body + battery compartment and DFx design unit;

[0069] The IP66 design requirements require the use of a waterproof and dustproof housing, a sealed negative pressure rubber ring, a waterproof LED light, a waterproof or touch-sensitive button, a waterproof aviation plug connector, and a PCB board with a matching shape and structure. In addition, the equipment's cables are advanced through a lightning arrester before entering the measuring instrument body, and the battery compartment is hung under the measuring instrument body. The lightning arrester, the measuring instrument body, and the battery compartment are all connected by aviation plug cables, which is convenient for installation and commissioning, battery replacement, and on-site maintenance. Figure 3 As shown, the details are as follows:

[0070] 1. The functions of the IP66 design unit are: dust-tight, no dust can enter at a low pressure of 20 mbar;

[0071] 2. Miniaturization and separation are for the convenience of installation and maintenance;

[0072] 3. DFx is a design for all aspects of the product life cycle, where x represents a certain link or characteristic of the product life cycle. It is a new design technology that considers factors such as product performance, quality, manufacturability, assemblability, testability, product service and price as early as possible in the design stage.

[0073] Example 2

[0074] like Figure 4 As shown, the working principle and working process of the cathodic protection intelligent potential measuring instrument are as follows:

[0075] 1. Analog current and voltage acquisition: The device periodically initiates acquisition commands to the analog signal measurement unit according to the acquisition frequency received by the external communication unit; the device respectively acquires the DC voltage and AC voltage of the power-on potential; the DC voltage of the power-off potential and the DC voltage of the natural potential; the current of the current electrode; Figure 2As shown; after the power-on potential and the power-off potential enter the device, they are connected together by default through the normally closed relay. At this time, the AC and DC voltages of the power-on potential are measured. After the relay is disconnected, the power-on potential is disconnected from the relay, and the power-off potential directly enters the device. At this time, the AC and DC voltages of the power-off potential are measured; the following describes how to test DC voltage, AC induced voltage and current respectively;

[0076] like Figure 5 As shown, DC voltage measurement: the target DC voltage has a range of ±5V; Solution 1: the signal is first divided by a precision resistor to become a ±1V signal, then passes through a voltage follower, and then passes through an adder with VREF=1.5V to obtain a 0.5~2.5V signal that can be collected by the ADC; Solution 2: first enter the comparator with a 0 reference potential, the result is greater than zero, and enters the follower after voltage division, the result is less than zero, and enters the inverter after voltage division to obtain a 0~2.5V voltage signal that can be collected by the ADC;

[0077] like Figure 6 As shown, AC induced voltage test: The range of the interference AC induced voltage is 0~100V. The DC signal is first isolated by a capacitor, and then enters the half-wave rectifier circuit after voltage division, and then enters the integration circuit. Finally, a measurable voltage value of 0~3V is obtained, which can be collected by ADC.

[0078] like Figure 7 As shown, current test: first use a high-precision resistor of 0.1 ohm, pass through a current and voltage amplifier, and amplify it 20~30 times. At this time, the DC voltage that can be measured through the 2-stage RC filter and the voltage follower can be reversed to the DC current. The AC current test method passes through the current and voltage amplifier and then through the capacitor to isolate the DC current. After passing through the full-wave rectifier circuit to take the absolute value, it is integrated to obtain the effective value of the AC voltage. After calculation, the value of the AC current can be reversed;

[0079] 2. Simulation measurement process:

[0080] like Figure 8 As shown, the analog measurement part can be processed in parallel by 5 ADCs. After the first ADC measures the DC potential of the pipeline, it turns on the relay (normally closed type) for 100ms and then measures the DC voltage of the isolation potential. The measurement scheme is as follows Figure 5 , and then the package is stored; the second ADC measures the AC interference induced voltage of the power-off potential. The specific measurement scheme is as follows Figure 6 ; The third one is to measure the DC voltage of the natural potential. The specific scheme is the same as the first ADC; the fourth ADC measures the DC current and the fifth ADC measures the AC current measurement scheme as follows Figure 7 ;

[0081] 3. Data processing:

[0082] The data obtained after the above measurement can be timestamped by RTC and compared with the data threshold set in advance. If it is within the normal range, it will be stored in FLASH. When the upload cycle is over, the new data (data that has not been uploaded) will be uploaded to the platform immediately. However, if it exceeds the alarm threshold, it will immediately enter the alarm state, and the collection and upload frequency of its state need to be set separately; the data in FLASH is retained for 7 days and will be overwritten by new data after 7 days;

[0083] The device interacts with the platform through the 4G module;

[0084] The platform and equipment can realize functions such as timed reporting, online upgrade, remote parameter setting and telemetry, which is convenient for maintenance personnel to perform remote maintenance and save customer labor costs.

[0085] The device realizes location positioning through the GNSS module;

[0086] The device and satellite can realize positioning function through GNSS module, with positioning accuracy of 2m;

[0087] Working mode of the device: The device has two working modes, and the collection frequency and upload frequency of the device can be set separately in the two modes: a. When the collected data is within the normal range, the device can upload less and enter the sleep state in the spare time. At this time, the power consumption is within 50uA@3.3V; b. When the collected data is judged to exceed the alarm threshold, the device enters the alarm state, collects and reports once every hour (the collection and upload frequency can be set), and enters the sleep state for the rest of the time until the collected data returns to below the threshold or the battery is exhausted.

[0088] Power design: The device is powered by a battery pack; the battery uses ER34615M, ensuring that the battery is replaced after 3 years at a frequency of collecting and uploading twice a day; the dormant power consumption when powered by the battery is less than 50uA@3.3V; if the system detects that the battery is undervoltage, it will immediately report to the platform to remind maintenance personnel to replace the battery;

[0089] RS232 interface: RS232 is the debug serial port of the device, through which the device can be debugged and burned.

[0090] Button function: The device has 1 button, which can be pressed briefly or long: short press for 2 seconds

[0091] In the dormant state, it wakes up the device, collects data once and then uploads it to the platform; in the normal state, it resets the device;

[0092] Press and hold for more than 6 seconds. In sleep mode, it has no function. In wake-up mode, it restores the device to factory settings.

[0093] Embodiment 3, the specific structure of each independent shell of the cathode protection intelligent potential measuring instrument of the utility model is as follows:

[0094] like Fig. 9 As shown, the independent shell of the measuring instrument body includes a main shell 1, an integrated circuit board 5 of the measuring instrument body is embedded in the main shell 1, and a front cover plate 2 and a rear cover plate 3 are respectively embedded at both ends of the shell 1, a GPS antenna seat 4 is provided on the front cover plate 2, and a plurality of aviation plugs 6 are respectively provided on the front cover plate 2 and the rear cover plate 3;

[0095] like Fig.10 As shown, the independent housing of the lightning protection assembly includes a main housing A7, a primary lightning arrester 8 is arranged in the main housing A7, a front cover A9 and a rear cover A10 are embedded at both ends of the main housing A7, and waterproof connectors 11 are respectively provided on the front cover A9 and the rear cover A10, and the waterproof connector 11 is used to connect the secondary lightning arrester and the measuring instrument body;

[0096] like Fig.11 As shown, the independent housing of the battery compartment includes a battery tube body 12, a battery 13 is embedded in the battery tube body 12, a battery tube cover 14 is embedded in the opening of the battery tube body 12, and a waterproof connector A15 connected to the battery 13 is connected to the battery tube cover 14; the battery tube body 12 is independently arranged below the independent housing of the measuring instrument body, which is convenient for replacement;

[0097] The main housing 1 and the main housing A7 can ensure that the measuring instrument body and the lightning protection components are dust-free, and each aviation plug is used to connect each module.

Claims

1. Cathodic protection intelligent potential measuring instrument, characterized in that: It includes lightning protection components, measuring instrument body and battery compartment, which are interconnected by aviation plug cables; The lightning protection assembly includes a primary lightning arrester and a secondary lightning arrester, the secondary lightning arrester is located in the measuring instrument body, and the equipment cable is connected to the measuring instrument body through the primary lightning arrester and the secondary lightning arrester in sequence; The measuring instrument body includes a minimum system unit, an external communication unit, an analog measurement unit and a power supply unit; The external communication unit and the analog measurement unit are both interconnected with the minimum system unit, and the power supply unit is connected with the minimum system unit and the battery compartment respectively.

2. The cathodic protection intelligent potential measuring instrument according to claim 1, characterized in that: The cathodic protection intelligent potential measuring instrument also includes independent shells corresponding to the lightning protection component, the measuring instrument body and the battery compartment, respectively, and a waterproof and dustproof unit is provided between each shell; The independent housing of the measuring instrument body comprises a main housing (1), an integrated circuit board (5) of the measuring instrument body is embedded in the main housing (1), a front cover plate (2) and a rear cover plate (3) are respectively embedded at two ends of the housing (1), a GPS antenna seat (4) is provided on the front cover plate (2), and a plurality of aviation plugs (6) are respectively provided on the front cover plate (2) and the rear cover plate (3); The independent housing of the lightning protection assembly comprises a main housing A (7), a primary lightning arrester (8) is arranged in the main housing A (7), a front cover plate A (9) and a rear cover plate A (10) are embedded at both ends of the main housing A (7), and waterproof connectors (11) are respectively provided on the front cover plate A (9) and the rear cover plate A (10), and the waterproof connectors (11) are used to connect the secondary lightning arrester and the measuring instrument body; The independent battery compartment housing comprises a battery tube body (12), a battery (13) is embedded in the battery tube body (12), a battery tube cover (14) is embedded in the opening of the battery tube body (12), and a waterproof connector A (15) connected to the battery (13) is connected to the battery tube cover (14).

3. The cathodic protection intelligent potential measuring instrument according to claim 1, characterized in that: The minimum system unit includes an MCU, a clock / RTC, a storage device FLASH / EEPROM, and a plurality of peripheral interface expansion chips; RTC is a real-time clock chip, which is connected to the MCU through the IIC bus; Storage FLASH / EEPROM, connected to MCU via IIC bus; IO / UART expansion chip, one side is connected to the MCU through the IIC bus, and the other side is connected to the peripherals through the UART bus.

4. The cathodic protection intelligent potential measuring instrument according to claim 1 or 3, characterized in that: The external communication unit includes a communication unit, a GNSS positioning and a debugging console port; The communication unit is connected to the MCU via a UART interface; the GNSS positioning unit is connected to the MCU via a UART bus.

5. The cathodic protection intelligent potential measuring instrument according to claim 4, characterized in that: The communication unit includes a 4G communication unit, a Lora communication unit, a WiFi communication unit, or a Beidou 3 short message communication unit.

6. The cathodic protection intelligent potential measuring instrument according to claim 1 or 3, characterized in that: The analog measurement unit includes 3 potential measurement units and 2 current test units; The three potential measurement units include the DC voltage of the on-off potential, the AC induced voltage of the off-power potential and the DC voltage of the natural potential; 2 current test units including AC current and DC current; One end of the potential measurement unit is connected to the MCU or expansion chip via UART / SPI, and the other end is connected to the potential measurement line. There are 4 lines in the potential measurement unit: pipeline, reference electrode, natural potential, and power-off potential. One end of the current test unit is connected to the MCU through ADC, and the other end is connected to the reference current test line. There are two wires in the current test unit, namely the AC current and the reference electrode.

7. The cathodic protection intelligent potential measuring instrument according to claim 1, characterized in that: The power supply unit includes a battery protection unit and various levels of DCDC / LDO boost and buck units; The battery protection unit is connected to the battery compartment and the DCDC / LDO boost and buck units at all levels behind it; The power pins of each level of the DCDC / LDO boost and buck units at the subsequent stages of the docking equipment.

Images