RU2486289C2 - Device for cathodic protection with self-contained power supply - Google Patents

Abstract

FIELD: electrical engineering.

SUBSTANCE: device contains a wind-powered generator, accumulator, pulse amplitude shaping unit, anode bed, reference electrode. The unit is connected with its first input to reference electrode and with its power supply inputs to accumulator outputs, with positive output to anode bed, with the second input and negative output to the protected structure; the unit has locking input and data exchange port. Additionally in the device there is a protector, circuit breaker, resistor, reserve control unit with two outputs and data exchange port, solar battery, the first and second isolating diodes, controller limiting charging rate of the accumulator; at that controller is installed between positive output of the accumulator and interconnected cathodes of the first and second isolating diodes. Anode of the first isolating diode is connected to positive output of wind-powered generator and the second isolating diode is connected to positive output of solar battery. Protector is connected with the first outputs of resistor and circuit breaker, which second output is connected to the second output of the resistor and connected to the protected structure. Reserve control unit is connected with its power supply inputs to outputs of the accumulator, with the first output to control input of circuit breaker, with the second output to locking input and with data exchange port to the data exchange port of pulse amplitude shaping unit.

EFFECT: device allows improvement of reliability for electrochemical protection of pipeline.

3 cl, 1 dwg, 1 ex

Description

The invention relates to equipment for electrochemical protection and can be used in cathodic protection systems of underground metal structures against corrosion.

There are various devices for cathodic corrosion protection [US patent for the invention No. 5324405, DE patent for the invention No. 2007347, RU patents for the invention No. 1823524, No. 2086703, No. 2202001].

A device is known for cathodic corrosion protection with autonomous power supplies [http://www.multiwood.ru/download/Cathodic_protection.pdf], including support structures, a charge and voltage controller, a cathodic protection regulator, a cable system and fasteners, industrial battery batteries and solar panels used as power sources.

There is also known a device for cathodic protection with self-powered [RU patent for utility model No. 92935], comprising at least one controller, a transceiver and an antenna-feeder device for providing radio communication with a control center, an energy supply system and a cathodic protection system. The power supply system includes autonomous power sources.

The disadvantage of the described device is the termination of its operation in case of exhaustion of the resource of all three autonomous energy sources, which leads to a decrease in the level of electrochemical protection of the pipeline.

The closest analogue to the claimed technical solution is a device for the cathodic protection of pipelines [RU patent for the invention No. 2117184], including a wind generator, a battery pack and a pulsed cathodic station, the principle of which is to form a pulse voltage on the pipeline relative to the anode earthing switches with relay regulation of the protective potential whose current value is controlled by a reference electrode. The pulse cathode station is powered by either a wind generator or a battery pack in the absence of wind.

The main disadvantage of the closest analogue is the low reliability of the protection of the structure, due to the irregular flow of electricity from the wind generator. Moreover, the capacity of the battery pack cannot provide, in the absence of wind, a continuous operation of the cathode station.

The task of the invention is to increase the reliability of electrochemical protection of the pipeline.

The essence of the claimed invention lies in the fact that in the device for cathodic protection with autonomous power supply, containing a wind generator, a battery, a pulse amplitude generating unit, an anode ground electrode, a reference electrode connected to the first input of the pulse amplitude generating unit, the inputs and outputs of which are connected as follows: power inputs - with battery terminals, positive output - with an anode ground electrode, the second input and negative output are connected to the protected structure, the pulse amplitude generation unit in has a blocking input and a data exchange port, a protector, a circuit breaker, a resistor, a reserve control unit with two outputs and a data exchange port, a solar battery, the first and second decoupling diodes, a controller for limiting the battery charge current are introduced into the device, while the introduced elements are connected as follows way: the battery charge current limiting controller is installed between the positive terminal of the battery and the cathodes of the first and second decoupling diodes connected to each other, the anode of the first decoupling diode it is connected to the positive output of the wind generator, the anode of the second decoupling diode is connected to the positive output of the solar battery, the protector is connected to the first output of the resistor and to the first output of the disconnector, the second output of which is connected to the second output of the resistor and connected to the protected structure; the reserve control unit is connected: by the supply inputs to the battery terminals, the first output to the disconnector control input, the second output to the interlock input, the data exchange port to the data exchange port of the pulse amplitude generating unit.

In addition, there is also claimed a self-powered device with the above features, in which the pulse amplitude generating unit is configured as a pulsed cathode station.

A self-powered device with the above characteristics is also claimed, in which a GSM modem with a remote antenna is built into the reserve control unit.

The technical result of the claimed invention consists primarily in the simultaneous use of both cathodic protection and tread in the role of corrosion protection together in one device. The authors in the process of working with analogues of a similar combination of two such different protection elements and thus connected into one circuit were not found. Provided that the resource of all three sources of the declared types of energy (wind generator, solar battery and battery pack) is exhausted, indicated both in the claimed and in the closest analogue, the operation and efficiency of the compared devices will be different. In the device claimed in this application, the corrosion protection mode is not interrupted by connecting the tread. If necessary, a message is generated via the communication channel about switching to passive protection - to tread corrosion protection.

In the closest analogue, a cessation of work occurs and it lasts until the repair restoration of the circuit.

Automatic connection of the tread in the described situation when the energy resources are exhausted is a backup option for the operation of the claimed device. During operation of the cathode station, the main mode of corrosion protection, the tread is not consumed, unlike the generally accepted mode of using the tread for corrosion protection. If in traditional applications of treads their service life is from 1.5 years to 5 years, then in this application in the inventive device, along with the cathode station (together), the tread life is extended to 15-20 years.

The use of a pulsed cathode station in the inventive device, in contrast to the continuous mode in the closest analogue, allows to reduce the consumed energy consumption by 8-10 times and increase the service life of the anode ground electrode by approximately the same amount, which is significantly due to the high cost of both the ground electrode and the complexity his replacement.

The invention is illustrated using Figure 1, which shows a conditional image of the components of the inventive device, as well as conditional images of the protected structure (pipeline) connected to the device, and positions 1-13 are indicated:

1 - wind generator

2 - battery

3 - block forming the amplitude of the pulses

4 - anode grounding

5 - reference electrode

6 - tread

7 - breaker

8 - resistor

9 - reserve control unit

10 - solar battery

11 - first decoupling diode

12 - second decoupling diode

13 - controller for limiting the battery charge current.

A self-powered cathodic protection device comprises a wind generator 1, a battery 2, a pulse amplitude generating unit 3, an anode ground electrode 4, a reference electrode 5, a protector 6, a breaker 7, a resistor 8, a reserve control unit 9, a solar battery 10, the first 11 and the second 12 decoupling diodes, controller 13 for limiting the charge current of the battery 2. The comparison electrode 5 is connected to the first input of the pulse amplitude generating unit 3, the inputs and outputs of which are connected as follows: power inputs - with the terminals of the battery 2, pl owl output - with the anode grounding 4, the second input and the negative output connected to the protected construction. The pulse amplitude forming unit 3 has a blocking input and a data exchange port. The controller 13 for limiting the charge current of the battery 2 is installed between the positive terminal of the battery 2 and interconnected cathodes of the first 11 and second 12 decoupling diodes. The anode of the first decoupling diode 11 is connected to the positive output of the wind generator 1. The anode of the second decoupling diode 12 is connected to the positive output of the solar battery 9. The protector 6 is connected to the first output of the resistor 8 and to the first output of the disconnector 7. The second output of the disconnector 7 is connected to the second output of the resistor 8 and connected to the protected structure. The reserve control unit 9 is connected: by the supply inputs to the terminals of the battery 2, the first output - with the control input of the disconnector 7, the second output - with the lock input, the data exchange port - with the data exchange port of the pulse amplitude generating unit 3.

At the stage of design work, the requirements for cathodic protection means as the main source of protective current and the requirements for protective means as the backup source of protective current that protects the structure during the restoration of the main source of protective current are determined.

The most optimal time and amplitude parameters of the output pulse signal of the cathode station are determined, based on which the average power consumption of the cathode station’s electricity from the power source is determined and, as a result of this, the requirements for the wind generator 1, for the battery 2, for the solar battery 10.

After commissioning, the battery 2 is the main power source for the pulse amplitude generating unit 3, which uses a pulsed cathode station, and a GSM modem included in the reserve control unit 9. Wind generator 1 and solar battery 10 provide, if there is an appropriate energy source (wind energy, light energy), recharging the battery 2. The charge current controller 13 continuously monitors the output current of the wind generator 1 and the solar battery 10. When the battery charge current is exceeded 2 critical value, the controller 13 turns off the wind generator 1 and the solar battery 10, preventing overcharging of the battery 2. The reserve control unit 9 controls the voltage at the terminals of the battery 2, that is, the supply voltage of the entire system. With a normal supply voltage, the reserve control unit 9 generates a signal to block the operation of the pulse amplitude generating unit 3 at its second output. At the same time, a signal to disconnect the breaker 7 is generated at the first output of the reserve control unit 9. This leads to the tread 6 being disconnected from the protected structure is not consumed as actively as it is consumed in its normal mode of operation. This provides a multiple increase in its service life. The reserve control unit 9, receiving information from the pulse amplitude forming unit 3 via the data exchange port, transmits the received data via a GSM modem to a remote dispatcher point.

When the supply voltage drops below normal (lack of wind, sun and empty batteries), the reserve control unit 9 switches to power from the built-in low-power battery, disconnects the pulse amplitude generating unit 3, connects the protector 6 to the protected structure with disconnector 7, and sends a message via the GSM modem that the structure is switched to passive protection from the tread 6. When the voltage on the battery 2 rises to a normal state, the system switches to the protection mode of the structure from the forming unit pulse amplitudes 3.

Implementation example. A self-powered cathodic protection device comprises, as a pulse amplitude generating unit, 3 a pulse cathode station with a maximum output voltage amplitude of 48 V, a pulse duration of 2 ms, a period of 20 mlsec, a maximum output current amplitude of 60 A, and a maximum power consumption of 300 W from a power source .

As a wind generator 1, a vertical inertial wind generator of the DPV 400 model with a rated output power of 400 W can be used.

Battery 2 must withstand deep discharge, a large temperature range of operation (from -50 to + 50 ° C). For this purpose, a battery of four GL12-200 batteries can be used. Moreover, to obtain a capacity of 400 A / h, two batteries are switched on in parallel, and to obtain a voltage of 24 V, the resulting batteries are turned on in series.

As the anode ground electrode 4 can be used oxide iron-titanium ground electrode ОЖТ3-1.

As a reference electrode 5, a copper sulfate reference electrode ENES-3M can be used.

As a protector 6, a PM20U magnesium protector or a CP-1 zinc protector weighing at least 20 kg can be used.

The reserve control unit 9 can be implemented on a PIC24FJ256GA106-I / PT PIC controller and ADM3485 microchips for organizing data exchange with external devices - a GSM modem and a cathode station. The reserve control unit 9 should function when the main power is turned off, so it contains an additional autonomous battery, which can be used as a maintenance-free battery type TP 1,3-6 TOP Power.

The solar battery 10 must generate an output voltage of 24 V and an output current of at least 10 A. As such a battery, two FSM-180 panels connected in series can be used.

The first 11 and second 12 decoupling diodes can be made on an assembly of Schottky diodes MV20100ST.

The GSM modem can be implemented on a module of the WISMO228 type. As the antenna, the GSMJCTP9018 (3mRG174) SMA antenna can be used.

The claimed technical solution is made in the form of a prototype, successfully tested in one of the organizations in the city of Saratov.

Claims (3)

1. A device for cathodic protection with autonomous power supply, containing a wind generator, a battery, a pulse amplitude generating unit, an anode ground electrode, a reference electrode connected to the first input of a pulse amplitude generating unit, the supply inputs of which are connected to the battery terminals, the plus output is with an anode ground electrode, the second input and negative output are connected to the protected structure, characterized in that the pulse amplitude generating unit has a blocking input and a data exchange port, a detector, a circuit breaker, a resistor, a reserve control unit with two outputs and a data exchange port, a solar battery, first and second decoupling diodes, a battery charge current limiting controller, while a battery charge current limiting controller is installed between the positive terminal of the battery and the cathodes of the first interconnected and the second decoupling diodes, the anode of the first decoupling diode is connected to the positive output of the wind generator, the anode of the second decoupling diode is connected to the positive output of the solar batteries, the protector is connected to the first output of the resistor and to the first output of the disconnector, the second output of which is connected to the second output of the resistor and connected to the protected structure, and the reserve control unit is connected by power inputs to the battery terminals, the first output with the control input of the disconnector, the second output and port data exchange, respectively, with the blocking input and with the data exchange port of the pulse amplitude generating unit. 2. The device according to claim 1, characterized in that the pulse amplitude generating unit is made in the form of a pulsed cathode station. 3. The device according to claim 1, characterized in that a GSM modem with a remote antenna is built into the reserve control unit.

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