EA029463B1 - Method for design of subsea electrical substation and power distribution system - Google Patents

Abstract

A subsea electrical subsystem and a power distribution utilizing the same. The electrical substation located subsea is electrically connected to AC power provided by a power generator located topside. The electrical substation comprises a plurality of circuit breakers and a circuit breaker operating system associated with each circuit breaker. The circuit breaker operating system is constructed and arranged to operate the associated circuit breaker and is operatively connected to at least one control module. The control modules are electrically connected to a DC power supply located topside.

Description

This invention claims the priority of provisional patent application US 61 / 780,459, filed March 13, 2013, entitled "ΜΕΤΗΘΌ ROCK ΌΕ3" OR δυΒδΕΑ UEHEMSAE δυΒ ΑΝΌ ΡΟΥΕΚ ΌΙδΤΚΙΒυΤΙΟΝ δΥδΤΕΜ ", and application for US patent No. 61/639501, filed April 27, 2012 ., entitled "ΜΕΤΗΟΌ ROCK ΌΕ3" OR δυΒδΕΑ ΕΕΕΟΤΚΓΑΕ δυΒδΤΑΤIΟN ", which are fully incorporated into this document by reference.

The technical field to which the invention relates.

This invention relates generally to the field of electrical substations and, more specifically, to underwater electrical substations powered by and controlled from surface equipment.

The level of technology

This section is intended to present various aspects of the prior art that may be associated with exemplary embodiments of the present invention. It is believed that this reasoning will help to provide a concept to provide a better understanding of specific aspects of the present invention. Accordingly, it should be understood that this section should be studied from this point of view and not necessarily as assumptions of the prior art.

Subsea electrical substations are often required for underwater hydrocarbon deposits with high electrical power consumption, located at great depths. Typically, underwater electrical substations are located many kilometers from the source of electrical power. The maintenance difficulties of subsea electrical substations are becoming more severe in arctic applications. Arctic conditions often make it almost impossible to access the underwater electrical substation for maintenance for several months due to the ice cover. Applications at great depths additionally require expensive vessels to rise to the surface to raise broken electrical equipment.

There are many well-known structures for electrical protection and control of an underwater electrical substation, and most of them are based on two concepts. The first concept can be considered in the form of the main surface systems of electrical protection and control, which are installed under water in the same air chamber. This concept is based on standard surface components and excess for improved preparedness. However, the use of systems made for surface use has its drawbacks, which include a high probability that the components will fail in the underwater environment. In this case, there is a subsequent need to lift the entire substation module and return it to a remotely located manufacturer for disassembly and repair. As noted above, the ability to lift an underwater module is expensive and in certain environments, such as arctic, may not be possible for 10 months. Modern "surface / shore-based" structures of this type often require daily intervention for maintenance.

The second concept includes liftable electrical control and protection modules that are installed underwater. Electrical control power is usually derived from underwater control power transformers, battery packs, or complex uninterruptible power supplies. This design often requires a ship-based remotely operated vehicle (FCC) to service the control module and completely remove the submarine substation to service the failed components of the control power. Again there are many drawbacks of having to lift the entire underwater station in case repair is necessary.

Thus, there is a need for improvement in this area.

Summary of Invention

The present invention provides a system and method for improving the reliability and availability of an underwater substation.

One embodiment of the present disclosure is a power distribution system comprising: a power generator designed and configured to provide AC power, a power generator located in the topside; DC power source, located in the topside; control system located in the topside; an underwater electrical substation, the electrical substation is electrically connected to the AC power provided by the power generator, the electrical substation contains a number of circuit breakers and a circuit breaker actuation system connected to each circuit breaker, the circuit breaker actuation system is designed and implemented the ability to operate the associated circuit breaker; a bus node electrically connected to each circuit breaker; and a plurality of under-water control modules, the control modules are electrically connected to a DC power source and connected to the control system, each control module is functionally connected to a circuit breaker actuation system.

Above, the features of one embodiment of the present disclosure have been widely described so that the detailed description that follows can be better understood. Additional Preferences - 1 029463

signs and embodiments will also be described here.

Brief Description of the Drawings

The present invention and its advantages will be better understood with reference to the following detailed description and the attached drawings.

FIG. 1 is a block diagram of an electrical system according to one embodiment of the present disclosure.

FIG. 2 is a block diagram of an electrical substation according to one embodiment of the present disclosure.

FIG. 3 is a block diagram of a connection for communication between circuit breaker actuation systems and circuit breaker control and protection modules according to one embodiment of the present disclosure.

FIG. 4A is a cross-sectional view of a power and communication umbilical according to one embodiment of the present disclosure.

FIG. 4B is a cross-sectional view of the auxiliary power and communication cable shown in FIG. 4a.

FIG. 5 is a block diagram showing the main steps in which the control and protection module of the circuit breakers is raised according to one embodiment of the present disclosure.

It should be noted that the figures are merely examples of some embodiments of the present invention, and thus are not intended to limit the scope of protection of the present invention.

Additionally, the figures are not generally drawn to scale, but are drawn for convenience and clarity in illustrating various aspects of certain embodiments of the invention.

Detailed description

In order to facilitate an understanding of the principles of the invention, reference will now be made to the embodiments illustrated in the drawings, and special wording will be used to describe them. However, it will be understood that thereby no restriction of the scope of protection of the invention is intended. Any changes and additional transformations of the described embodiments and any additional applications of the principles of the invention, which are described here, are considered by a person skilled in the art to whom the invention pertains, as usually occurring. One embodiment of the invention is shown in great detail, although it will be clear to those skilled in the art that some features that are not relevant to the present invention may not be shown for clarity.

Embodiments of the present disclosure provide a modular and reliable electrical substation or underwater distribution equipment configured to operate without interference for long periods of time. The substation may be a 36 kV underwater distribution equipment. Power equipment of distribution equipment can consist of standard circuit breakers, low-power measuring transformers and insulated busbar assemblies. The components of distribution equipment can be placed in the chamber under pressure. The chamber may be filled with gas or oil, but is not limited to this. In one embodiment, the chamber is filled with SF6 gas.

In order to maximize overall system availability, the control and protection electronics for each circuit breaker can be placed in separately retrievable modules, rather than a chamber enclosing a circuit breaker triggering mechanism. This configuration helps to reduce the average repair time in case the substation or associated equipment requires maintenance, thereby leading to increased functional readiness of the substation.

The control and protection electronics in each module can be designed and configured to automatically protect and control the adjacent circuit breaker simultaneously with its main circuit breaker, which also increases the reliability / availability of the power source for loads. In the event that the control and protection module of the switches fails, the redundant configuration of the control and protection module allows replacing any module without losing control of the associated circuit breaker. In these embodiments, which provide such redundant control and protection, the availability of power to the load is maintained even during the short time required to replace the module.

In some embodiments, an auxiliary power from a coast station (or other power source) may be provided to the substation. Auxiliary power can be provided through redundant DC cables embedded in the umbilical (i.e., submarine power cable). In some embodiments, the execution of a high-voltage direct current may be lowered before being applied to control and protection systems. Through independent actuation of the control system, the status of each circuit breaker can be monitored and adjusted during an emergency start without the need for a sophisticated battery-powered underwater uninterrupted auxiliary power system.

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Embodiments of the entire system may include a communication system. The communication channel between the switchgear module and the coast station can be made over redundant fiber optic cables, also embedded in the umbilical. The communication channel can also be provided in a separate communication line. The remote control and monitoring system provides reconfiguration of electronic devices, thus making it possible to adapt the functioning of the power supply system to modern conditions on the underwater platform.

FIG. 1 is a block diagram of a power distribution system 100 according to one embodiment of the present disclosure. As shown, power distribution system 100 includes a generator 101 designed and configured to generate high voltage AC power, a DC power source 103 designed and configured to provide high voltage DC power, and a control system 105. Although only one generator, DC source, and control system is depicted, other embodiments may include multiple generators, DC sources, and / or control systems. Ancillary equipment for ac power generators and dc power sources, such as, but without limitation, transformers, circuit breakers, etc., was not shown for clarity, although the inclusion and use of such equipment in the electrical systems of the present disclosure will be known and understandable to those skilled in the art. As understood by a person skilled in the art, a power source can be obtained by local generation or by connecting to a local power plant. The choice of high voltage dc voltage may depend on several factors, such as, but not limited to, the total number of substations connected to a single power source. In some embodiments, the high voltage DC voltage is between 2 and 10 kV, although other voltages may be appropriate depending on the design goals and system configuration.

Returning to FIG. 1, the output of the generator 101, the DC source 103 and the control system 105 are provided at the surface attachment 107 of the umbilical connection (ITL). As understood by a person skilled in the art, ITA 107 is the interface between the surface equipment and the main umbilical 109. The main umbilical 109 provides high voltage alternating current, high voltage direct current and a communication line from the surface part through the water line 111 to the submarine station 121. as used here, the term "surface" means above the water line.

As shown, the submarine ITA 113 is provided with the ability to separate various cables connected inside the umbilical 109. More specifically, high voltage AC cable 115, high voltage DC cable 117 and communication cable 119 are provided to substation 121 and its associated equipment.

FIG. 2 is a block diagram of an electrical substation 121 according to one embodiment of the present disclosure. As shown, electrical substation 121 houses two circuit breakers 201, 203. Circuit breakers 201, 203 are electrically connected to bus 205. An electrical substation may include more circuit breakers depending on the design goals and the needs of the entire electrical system. These high voltage components are located inside the chamber 207. In some embodiments, the high voltage AC power equipment in the substation is designed and configured to function inside an oil-based gas or insulating medium. Chamber 207 may be filled with SF6 gas, insulating oil, or other insulating media. The chamber may have a pressure of 150 kPa, although other pressures may be applied. The chamber 207 may be made of a variety of materials, such as, but not limited to, steel. For example, §35512, Р500ЦЬ2 and 80НЬЕ§ can be used to carry out the chamber 207.

In the illustrated embodiment, circuit breaker 201 functions as an input breaker. As a result, the high voltage AC line 115 is connected to the input 209. As understood by a person skilled in the art, when the switch 201 is in its on position, high voltage alternating current is provided to the bus 205 and all circuit breakers connected to it. In some embodiments, sensor devices are also provided for each circuit breaker in order to provide information to the control system and electrical protection. In the depicted embodiment, a non-contact voltmeter 211 and a low-power current transformer 213 are connected to each circuit switch 201, 203. Voltmeters 211 and current transformers 213 are electrically and / or with the possibility of communication connected to the output terminals 215 and 217 of the sensor, respectively. Connection 219 to the load allows high voltage alternating current to be supplied to the load in case circuit breakers 201 and 203 are turned on.

The system 221, 223 actuation of circuit breakers, respectively, is associated with each circuit switch 201, 203. Each circuit breaker actuation system 221, 223 is electrically connected to its associated circuit breaker. In one embodiment, the circuit breaker actuation systems have their own cameras. In one embodiment of the triggering system, the circuit breakers are enclosed in a chamber with a relative pressure of 150 kPa. AT

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One embodiment of the circuit breaker actuation system is filled with a nitrogen gas atmosphere. In some embodiments, there is no pressure drop between the internal pressures of the high voltage AC chamber and the chamber of the circuit breaker actuation system.

Additionally, each system 221, 223 actuating circuit breakers 223 has connections 225 of the protection module. In the illustrated embodiment of the circuit breaker actuation system, there are two connections of the protection module so that two independent protection modules can be electrically connected to the circuit breaker actuation system.

FIG. 3 is a block diagram of the communication connection between the circuit breaker actuation systems 221, 223 and the circuit breaker control and protection modules 301, 303 according to one embodiment of the present disclosure. As shown, each switch control and protection module (HCPM) 301, 303 is placed separately from substation 121. Each HSRM 303 has three input connections 305 and two output terminals 307. For input connections, each VSRM is connected to a high-voltage DC line 117 and line 119 connection. In addition, each HRMS is connected to the output of voltmeters and current transformers connected to the associated circuit breaker (s) with which the HRPM controls and protects. Although three input connections are depicted, additional inputs may be provided for the design purpose, and more connections may be provided for each function (for example, but not limited to, multiple connections for the sensor input). Connections to switchgear and associated equipment and modules can be made using underwater connectors.

As noted above, each HCPM 301, 303 can provide control and protection for multiple circuit breakers 201, 203. Each VSRM contains protection relays and power sources required for the proper functioning of the connected (connected) circuit breaker (s). In order to increase the reliability and availability of the switchgear module, each circuit breaker can also be protected and controlled by the HRPM of the adjacent or separate circuit breaker. The redundant configuration provided in FIG. 3, helps to provide a more reliable system. In one embodiment, each HCPM provides a "main" control for one circuit breaker actuation system and an "auxiliary" control for another circuit breaker control system. In the depicted embodiment, HCPM 301 provides its main control means for the system 221 of actuating the circuit breakers along the control line 309. The HRPM 301 also provides an auxiliary control for the circuit breaker operating system 223 along the control line 311. In turn, HCPM 303 provides its main control means for operating circuit breaker system 223 along control line 313. The HRPM 303 provides an auxiliary control for the triggering system 221 of the circuit breakers along the control line 315. The HRPC has the same functionality, regardless of its role as a “main” or “auxiliary” control.

In one embodiment, the HRVM8 are liftable separately. In the event that the HCPM needs to be lifted for repair, the entire system can remain uninterrupted. As described here, the protection, monitoring and control of a substation can be provided by an adjacent HRPM without any substation configuration changes or a HRPM during the lifting process. Since the circuit breaker tripping and turning off coils have a dedicated power source, they can be turned on and off remotely from a coast station or surface control system.

Based on information received at the sensor input connection 305, each BCPM can autonomously monitor a variety of conditions, such as, but not limited to, the output current of the circuit breaker. In the event that the parameter exceeds a predetermined value, the BCPM shuts off the switch via power or communication provided through the control line. The trip values can be configured from a surface control system or station. As previously described, in order to provide a smooth transfer of protection in the event of a failure of the HRPM, each circuit breaker can be effectively protected by two SRVMs. In this configuration, both VSRMk will attempt to open the circuit breaker using independent trip coils in the event of an overcurrent or other event.

By connecting to the communication line 119, each HRPM 303 may be in constant communication with the surface control system. In a particular embodiment, the HRPM will continuously, periodically or, upon command, report information to a surface control system. The informational message may include the current state of the switch, the position of the switch, and the state of the HCPM, such as charging of the switch-off spring. From the surface, through the HRPM, the switch can be commanded to shut off or turn on, and / or the shutdown spring can be commanded to charge.

FIG. 4A is a cross-sectional view of a power and communication umbilical 109 according to one embodiment of the present disclosure. As pictured, the umbilical

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109 is surrounded by a main chamber 401. The main chamber 401 is designed and configured to withstand the pressures normally encountered underwater conditions. In the illustrated embodiment, three high voltage AC lines 403 are provided. In addition, three auxiliary power and communication cables 405 are provided. Although three auxiliary power and communication cables 405 are depicted, other embodiments may have fewer or more cables. Supporting structures 407 may also be provided to maintain the overall stiffness of the umbilical 109 and / or maintain the placement of the auxiliary power and communication cables 405.

FIG. 4B is an exploded cross-sectional view of the auxiliary power and communication cable 405 shown in FIG. 4. Auxiliary power and communication cables 405 include sheath 409, outer coaxial conductor 411, insulator 413, inner coaxial conductor 415 and fiber optic line 417. Auxiliary power and communications cables 405 are provided to provide communication and dc power to the HRPMS . For each auxiliary power and communication cable 405, a coaxial configuration is shown to reduce the connection to the main AC conductors 403. In order to supply several kilowatts of power to one or more HRPMs located at a distance (such as, but not limited to, up to 150 km) from a surface source, external coaxial conductor 411 and internal coaxial conductor 415 can be dimensioned so that makes no more than 1 Ω / km. In one embodiment, the conductors are designed and configured to operate with 10 kV DC. In one embodiment, the plurality of optical fibers comprise fiber optic line 417.

FIG. 5 is a block diagram showing the main steps in which the control and protection module of the circuit breakers is raised according to one embodiment of the present disclosure. Process 500 begins with a step that identifies the BCPM that must be removed (block 501). The HRVM can be identified through communication with a surface control system. HCPM can be removed due to malfunction identification, periodic repairs, etc. The identification can be based on information received from control devices related to each circuit breaker inside the substation. Control devices can be, but without limitation, voltmeters and / or current transformers.

Prior to the removal of the HRPM, the control system confirms that the adjacent HRPM can operate the circuit breaker, which is primarily controlled by the removed HRPM (block 503). As soon as confirmation has been received, the control of the switch of the BCPM circuit is turned off (block 505). Next, disconnect the constant current source to the VCRM (block 507). Communication lines and sensor lines are also disconnected (block 509). If the necessary lines are successfully disconnected, a remotely controlled vehicle or other suitable device for removing the HRVM can be used (block 511).

Although, for the sake of simplicity of explanation, the illustrated methodologies are shown and described as a sequence of blocks, it should be understood that the methodologies are not limited to the order of the blocks, since some blocks may occur in different orders and / or simultaneously with other blocks, compared to what is described and shown. Moreover, the implementation of an exemplary methodology may require less than all the illustrated blocks. Blocks can be combined or divided into multiple components. Moreover, additional and / or alternative methodologies may apply additional units not shown here. Although the Figures illustrate various actions that occur periodically, it should be understood that various actions may occur sequentially, essentially in parallel and / or, essentially, at different points in time.

The disclosed aspects can be used in hydrocarbon development activities. As used herein, “hydrocarbon development” or “hydrocarbon development” includes the extraction of hydrocarbons, the production of hydrocarbons, the exploration of hydrocarbons, the determination of potential hydrocarbon resources, the determination of well locations, the determination of the depth of injection and / or pumping of wells, the determination of the connectivity of formations, the acquisition, expropriation and / or abandonment of hydrocarbon resources, a review of prior hydrocarbon development decisions and any other hydrocarbon related activities and and activities. The expression "hydrocarbon development" is also used to inject or store hydrocarbons or carbon dioxide, for example, carbon dioxide sequestration, such as reservoir evaluation, field planning, and reservoir development. In one embodiment, the disclosed methodologies and techniques may be used to extract hydrocarbons from a formation region. In such an embodiment, the embodiments described herein may be used to drive equipment associated with the production or recovery of hydrocarbons. The equipment and technologies used to drill a well and / or extract hydrocarbons are well known to those skilled in the art. Other hydrocarbon recovery activities and, in general, other hydrocarbon development activities may be carried out according to known principles.

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The following letter-marked paragraphs represent non-exclusive ways of describing embodiments of the present disclosure.

A. Power distribution system containing

a power generator designed and configured to provide AC power; the power generator is located in the topside;

DC power source, located in the topside; control system located in the topside;

an electrical substation located underwater, where the electrical substation is electrically connected to the AC power provided by the power generator, the electrical substation contains a plurality of circuit breakers and a circuit breaker actuation system connected to each circuit breaker, the circuit breaker actuation system is designed and implemented with the ability to actuate the associated circuit breaker;

a bus node electrically connected to each circuit breaker; and

a plurality of control modules located underwater, the control modules are electrically connected to a DC power source and connected to the control system, each control module is functionally connected to a circuit breaker actuation system.

A1. The power distribution system according to paragraph A, in which the electrical substation further comprises at least one control device associated with each circuit breaker, the control device is designed and configured to detect the conditions of the associated circuit breaker.

A2. The power distribution system according to paragraph A1, in which the condition conditions can be selected from the group comprising the circuit breaker current, the circuit breaker position and the status of the protection module.

A3. The power distribution system described in any of paragraphs A-A2, in which the circuit breakers and the bus node are located in the substation chamber.

A4. The power distribution system according to paragraph A3, in which the cell of the substation is filled with SF6 gas.

A5. The power distribution system described in any of paragraphs A-A4, in which the control modules are located in the module chamber.

A6. The power distribution system according to paragraph A5, in which the module chamber is filled with nitrogen.

A7. The power distribution system described in any of paragraphs A-A6, in which each system of actuating circuit breakers is electrically connected to more than one control module.

A8. The power distribution system described in any of paragraphs A-A7, in which the control system is connected with the possibility of communication with the control module fiber optic cable.

B. A method for maintaining a power distribution system, comprising the steps of providing a power distribution system, comprising

a power generator designed and configured to provide AC power; a power generator located in the surface part;

DC power source, located in the topside; control system located in the topside;

an underwater electrical substation, the electrical substation is electrically connected to the AC power provided by the power generator, the electrical substation contains a number of circuit breakers and a circuit breaker actuation system connected to each circuit breaker, the circuit breaker actuation system is designed and implemented the possibility of actuating the associated circuit breaker;

a bus node electrically connected to each circuit breaker; and

a plurality of control modules located under water; the control modules are electrically connected to a DC power source and connected to the control system;

identifying a removable first control module, the first control means being configured to control the first actuation system of the circuit breakers;

disconnecting the first control module from the DC power source and control system; and

remove the first control module from its underwater location.

IN 1. The method according to paragraph B, further comprising receiving confirmation that the second control means can control the actuation system of the circuit breakers.

AT 2. The method according to paragraph B or B1, wherein the first control module is removed using a remotely controlled vehicle.

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IN 3. The method described in any of paragraphs B-B2, in which the electrical substation further comprises at least one control device associated with each circuit breaker, the control device is designed and configured to detect the conditions of the associated circuit breaker.

AT 4. The method outlined in any of paragraphs B-B3, in which the identification of the removed first control module is based on the detected conditions of the state of the associated circuit breaker.

AT 5. The method described in any of paragraphs B-B4, in which the electrical connection of the substation with AC power is maintained when the first control module is removed from its underwater location.

It should be understood that the foregoing description is merely a detailed description of specific embodiments of this invention, and that numerous changes, transformations and alternatives to the disclosed embodiments in accordance with the present disclosure can be made without deviating from the scope of protection of the invention. Therefore, the preceding description is not intended to limit the scope of protection of the invention. More precisely, the scope of protection of the invention is to be determined only by the attached claims and their equivalents. It is also assumed that the designs and features implemented in these examples can be modified, reconstructed, replaced, deleted, duplicated, combined or added to each other.

Claims (10)

CLAIM 1. The method of servicing the power distribution system, including a power generator adapted to provide AC power, the power generator being located in the topside; DC power source, located in the topside; control system located in the topside; an electrical substation located under water and electrically connected to a power generator, the electrical substation comprises a plurality of circuit breakers and a circuit breaker actuation system associated with each circuit breaker, wherein the circuit breaker actuation system is adapted to actuate the associated circuit breaker, moreover, the electrical substation additionally contains at least one control device associated with each circuit breaker, the control device To configured to detect status conditions associated circuit breaker; a bus node electrically connected to each circuit breaker; and a plurality of control modules located underwater, the control modules are electrically connected to a DC power source and connected to communicate with a control system, each control module being functionally connected to a plurality of circuit breaker actuating systems to control these circuit breaker actuating systems , and each circuit breaker actuation system is electrically connected to more than one control module, containing the steps in which identifying the removed first control module, wherein the first control module is configured to control the first actuation system of the circuit breakers, wherein the identification of the first module to be deleted is based on the detected condition of the associated circuit breaker; transmitting control of the triggering system of the circuit breakers controlled by the first control module to be removed to another control module connected to said triggering system of the circuit breakers; disconnecting the first control module from the DC power source and control system; and the first control module is removed from its subsea location, and the electrical connection of the substation with AC power is maintained when the first control unit is removed from its subsea location. 2. The method according to claim 1, further comprising receiving a confirmation that the second control means can control the first actuation system of the circuit breakers. 3. The method according to claim 1, in which the first control module is removed using a remotely controlled vehicle. 4. The power distribution system for implementing the method according to claim 1, containing a power generator adapted to provide AC power, the power generator being located in the topside; DC power source, located in the topside; control system located in the topside; - 7 029463 an electrical substation located underwater, the electrical substation is electrically connected to the AC power provided by the power generator, the electrical substation contains a plurality of circuit breakers and a circuit breaker actuation system connected to each circuit breaker, wherein the circuit breaker actuation system is adapted to actuating the associated circuit breaker; a bus node electrically connected to each circuit breaker; and a plurality of control modules located underwater, the control modules are electrically connected to a DC power source and connected to communication with a control system, each control module being functionally connected to a plurality of circuit breaker actuation systems to control these circuit breaker actuation systems , wherein the control modules are located in the module chamber and each circuit breaker actuation system is electrically connected to more than one control module. 5. The power distribution system according to claim 4, in which the electrical substation further comprises at least one control device associated with each circuit breaker, the control device is adapted to detect the conditions of the associated circuit breaker. 6. The power distribution system of claim 5, wherein the condition conditions are selected from the group consisting of a circuit breaker current, a circuit breaker position, and a state of the protection module. 7. The power distribution system according to claim 4, in which the circuit breakers and the bus node are located in the substation chamber. 8. The power distribution system according to claim 7, in which the chamber of the substation is filled with SF6 gas. 9. The power distribution system according to claim 4, in which the module chamber is filled with nitrogen. 10. The power distribution system according to claim 4, in which the control system is connected with the possibility of communication with the control module fiber optic cable.