RU51132U1 - ELECTRIC MOTOR CONTROL STATION - Google Patents

Abstract

The utility model relates to the field of electrical equipment and equipment for oil production, and in particular to control stations designed to control, protect and control the speed of rotation of asynchronous electric motors of submersible centrifugal pump units for oil production. The technical result achieved by the implementation of the utility model consists in providing the possibility of increasing the rated current in the power circuit and the power of the connected equipment (submersible electric motor) by increasing the efficiency of using the capabilities of the element base and ensuring reliable and efficient cooling of the thyristor and transistor modules while eliminating the possibility of polluting elements from the cooling medium to the power compartment of the station, as well as to simplify installation, commissioning x, repairs, and reducing the time required to carry out, due to the modular principle of building the station and ensure ease of installation (dismantling) of the power equipment compartment. The submersible electric motor control station includes a power compartment in which the thyristor modules of the adjustable rectifier are located, combined in three groups, each of which is placed on the corresponding radiator, and voltage conversion units, the number of which is a multiple of three. Each of the voltage conversion units includes transistor modules of the frequency converter, capacitors, and a radiator on which transistor modules are mounted. The control station is equipped with a cooling system for thyristor and transistor modules, which includes three fans and a cooling system compartment for placed finned radiators, the internal volume of which is isolated from the internal volume of the power compartment. The radiator of each voltage conversion unit is located above the radiator of one of the groups of thyristor modules, and the cooling system is designed to provide air supply along the edges of the radiators.

Description

The utility model relates to the field of electrical equipment and equipment for oil production, and in particular to control stations designed to control, protect and control the speed of rotation of asynchronous electric motors of submersible centrifugal pump units for oil production.

A known submersible motor control station described in patents RU 25964 U1, 10.27.2002, RU 29411 U1, 05.10.2003 and RU 2239267 C2, 05.27.2004, including a control compartment, input / output compartment of power cables, power compartment, in which thyristor modules are mounted on a common radiator for converting the power voltage of the supply network to a constant regulated voltage, transistor modules for converting DC voltage to an alternating voltage with an adjustable frequency and the corresponding drivers. Capacitors for smoothing the voltage at the input of transistor modules are also located in the power compartment. The control station includes a cooling system compartment, one of the walls of which is formed by the said radiator, made with ribbing from the side, facing the cooling compartment, and a compartment in which a three-phase current-limiting is placed

throttle. On the wall of the cooling compartment opposite the radiator, a compartment with a fan is mounted so that it provides air supply perpendicular to the surface of the radiator.

The main disadvantages of the analogue are, firstly, the non-optimal layout of the fan from the point of view of operating the station in real conditions, since the flow from the fan is fed to the radiator perpendicular to its finned surface, accordingly dust particles, midges and other particles in the air will break on the surface radiator and accumulate on it in the form of layers with low thermal conductivity, which can significantly worsen the cooling conditions of the elements of the control station. Secondly, the placement of all thyristor, transistor modules and driver boards on a single supporting element does not allow partial block replacement of failed nodes and, therefore, does not allow repair of the control station in the absence of highly qualified personnel.

The closest analogue of the utility model (prototype) is a submersible motor control station (see patent RU 44768 U1, 03/27/2005), which includes a control compartment, an input / output compartment of power cables and a power compartment, in which two three-phase current-limiting reactors are located and two identical power modules containing a removable base with a radiator on which thyristor and transistor modules are mounted, as well as capacitors mounted directly on the base. Power Modules Installed Vertically

parallel to each other, while their radiators form part of the side wall of the central vertical duct of the power module cooling system. Radiators are made with ribbing from the side facing the duct. The control station also contains a fan compartment located in the lower part of the station, in which there are two fans of the cooling system of the power modules, designed to supply air to the said duct.

The prototype implements the modular principle of constructing a control station, which consists in the fact that it contains two identical power modules operating in parallel, which allows increasing the power of connected equipment without increasing requirements for the element base, while the power modules are completely interchangeable and easy to install (dismount), which is essential increases the convenience of assembly and repair of such stations. However, if it is necessary to quickly repair the control station, it is necessary to completely replace the entire power module containing the failed element. In addition, the complete duplication of nodes designed for voltage conversion leads to some complication and increase the cost of the control station.

Thus, the task to which the present utility model is directed is to create a control station designed to control, protect and control the speed of rotation of submersible asynchronous electric motors of increased power.

The technical result achieved by the implementation of the utility model consists in providing the possibility of increasing the rated current in the power circuit and the power of the connected equipment (submersible electric motor) by increasing the efficiency of using the capabilities of the element base and ensuring reliable and efficient cooling of the thyristor and transistor modules while eliminating the possibility of polluting elements from the cooling medium to the power compartment of the station, as well as to simplify installation, commissioning x, repairs, and reducing the time required to carry out, due to the modular principle of building the station and ensure ease of installation (dismantling) of the power equipment compartment.

The submersible motor control station includes a power compartment in which thyristor modules are installed on the radiator for converting the power supply voltage to a constant regulated voltage, transistor modules are installed on the radiator for converting direct voltage to an alternating voltage with an adjustable frequency, as well as capacitors for smoothing voltage at the input of transistor modules. The control station also contains fans for supplying air from the environment to said radiators. Moreover, unlike the prototype, the thyristor modules are combined into three groups, each of which is placed on the corresponding radiator. The control station includes voltage conversion units, the number of which is a multiple of three, while the conversion units

voltages are included in the power circuit of the station in such a way that their parallel operation is ensured. Each of the voltage conversion units includes capacitors and transistor modules, as well as a radiator on which transistor modules are installed. The control station is equipped with a cooling system for thyristor and transistor modules, which includes at least three fans for supplying air to the said radiators and a compartment for the cooling system of thyristor and transistor modules, the internal volume of which is isolated from the internal volume of the power compartment. The radiators of the voltage conversion units and the radiators of the groups of thyristor modules are at least partially located in the specified compartment, and at least part of the surface of each of the radiators located in this compartment is made with fins. The radiator of each voltage conversion unit is located above the radiator of one of the groups of thyristor modules in such a way that the edges of the radiator of the voltage conversion unit are at least approximately aligned with the radiator fins of the group of thyristor modules, and the cooling system of the thyristor and transistor modules is made in such a way to provide air along the fins of the radiators.

In addition, in the particular case of implementing the utility model, the control station includes two three-phase current-limiting reactors connected in parallel to the power circuit of the station, and two sections of an adjustable rectifier, each of which is connected in series with the corresponding

three-phase choke, sections of the adjustable rectifier consist of thyristor modules included in groups located on adjacent radiators.

In addition, in the particular case of implementing the utility model, the control station includes three identical voltage conversion units, and the cooling system for thyristor and transistor modules contains three fans, each of which is designed to supply air along the radiator fins of the voltage conversion unit and a group of thyristor modules, located one above the other, while these radiators form the corresponding parts of the common wall of the power compartment and the compartment of the cooling system of thyristor and transistor m moduli.

Moreover, in the particular case of implementing the utility model, above the radiators of the voltage conversion unit and the group of thyristor modules located one above the other, there is a casing covering the parts of the radiators located in the compartment of the cooling system of the thyristor and transistor modules, from the external and lateral sides with respect to the direction of the air flow, while one of the open end faces of the casing is located in such a way as to ensure air supply from the cooling fan of the thyristor and transistor modules directly into the space between the walls of the casing.

In addition, in the particular case of the implementation of the utility model, it contains a fan compartment in which the fans of the cooling system of thyristor and transistor modules are located, which are fans

centrifugal type, one of the walls of the fan compartment is common with the wall of the compartment of the cooling system of thyristor and transistor modules and channels are made in it for the passage of cold air from the mentioned fans.

Moreover, in the particular case of the utility model, the fan compartment is located in the lower part of the station under the power compartment and the compartment of the thyristor and transistor modules cooling system.

In addition, in the particular case of the implementation of the utility model, in the opposite wall of the radiator compartment of the thyristor and transistor module cooling compartments, mesh-closed windows for discharging heated air are made, while a means for directing the heated air flow passing through the thyristor and transistor module cooling compartment is installed through radiators, in the direction of the aforementioned windows.

In addition, in the particular case of implementing the utility model, in the lower part of the compartment wall of the cooling system of the thyristor and transistor modules opposite the radiators, a slot is made for the discharge of dust, precipitation, midges and other elements entering the compartment with the air flow from the fans and / or through the windows for emission of heated air.

Moreover, in the particular case of implementing the utility model, a casing open from above is fixed on the inside of the wall, the upper part of which is located above the radiators of the voltage conversion units, and the bottom of the casing is beveled towards the slit, and the gap is located between the side walls of the casing in the immediate vicinity of lower

part of the bottom of the casing, the bevel angle of which relative to the plane of the compartment wall is not more than 45 °.

Moreover, in the particular case of the implementation of the utility model, the angle of inclination of the bottom of the casing is in the range from 25 ° to 35 °.

In addition, in the particular case of the implementation of the utility model, the cooling system compartment of the thyristor and transistor modules is equipped with a door, the dimensions of which allow at least one voltage conversion unit assembly and / or one group of thyristor modules mounted on a radiator to pass through it.

In this case, in the particular case of the implementation of the utility model, the compartment door of the cooling system of thyristor and transistor modules forms the compartment wall opposite to the radiators.

In addition, in the particular case of the implementation of the utility model, three-phase current-limiting chokes are located in the fan compartment.

In addition, in the particular case of the implementation of the utility model, the voltage conversion unit comprises a frequency converter assembly including transistor modules and a radiator on which transistor modules are mounted.

Moreover, in the particular case of the implementation of the utility model, the frequency converter assembly includes a temperature sensor for transistor modules, which provides the possibility of generating a command to turn on the fans of the cooling system of thyristor and transistor modules when the temperature rises above the first specified value, the shutdown command

fans of the cooling system of thyristor and transistor modules with a subsequent decrease in the temperature of the transistor modules below the second specified value, as well as commands for emergency shutdown of the control station if the temperature of the transistor modules is higher than the third specified value.

Moreover, in the particular case of the utility model, the first preset temperature is + 60 ° C, the second preset temperature is + 40 ° C, the third preset temperature is + 115 ° C.

In addition, in the particular case of the implementation of the utility model, the node of the frequency converter includes an output current sensor.

In addition, in the particular case of the implementation of the utility model, the node of the frequency converter includes a driver for controlling transistor modules.

At the same time, in the particular case of the implementation of the utility model, the voltage conversion unit comprises a capacitive storage unit including capacitors of the voltage conversion unit.

In addition, in the particular case of the implementation of the utility model, axial-type fans are installed in the power compartment for ventilation of the internal volume of the power compartment of the control station.

At the same time, in the particular case of the utility model, a semiconductor type temperature sensor is installed in the power compartment, designed to measure the negative temperature range and provide

the possibility of generating a command to turn on fans intended for ventilation of the internal volume of the power compartment when the temperature in the power compartment rises above the fourth setpoint, a signal to turn off the fans with a subsequent decrease in temperature below the fifth setpoint and a ban signal to turn on the control station if the temperature in the power compartment below the sixth setpoint.

Moreover, in the particular case of the implementation of the utility model, the fourth preset temperature is -10 ° C, the fifth preset temperature is -15 ° C, the sixth preset temperature is -35 ° C.

In addition, in the particular case of the implementation of the utility model, electric heating elements are installed in the power compartment for heating the transistor modules and the internal volume of the control station.

Moreover, in the particular case of implementing the utility model, a second bimetallic temperature sensor is installed in the power compartment, designed to turn on electric heating elements when the temperature in the power compartment drops below the seventh predetermined value and turn off the electric heating elements when the temperature rises in the power compartment above the eighth predetermined value .

Moreover, in the particular case of the implementation of the utility model, the seventh preset temperature value is + 5 ° C, the eighth preset temperature value is + 10 ° C.

The structural separation of the rectifier from the frequency converter (inverter) provides the implementation of the modular principle of station construction. This makes it possible to carry out operational repairs of the control station by unit-wise replacement of failed nodes in the absence of highly qualified personnel, and also greatly simplifies the assembly of power station components and their installation in the station cabinet.

The presence of several interchangeable voltage conversion units, including a frequency converter assembly with transistor IGBT modules (IGBT - Integrated Gate Bipolar Transistor), appropriate drivers and sensors, and a capacitive storage assembly, is also aimed at implementing the above-mentioned modular principle. In addition, the described inverter arrangement allows the use of universal units of the frequency converter, which have good technical characteristics at relatively low cost, in particular, SkiiP modules (SEMIKRON Integrated Intelligent Power) manufactured by SEMIKRON Inc.

The number of voltage conversion blocks that is a multiple of three allows you to receive alternating current corresponding to one of the phases of the output current of the station on each of the three blocks (three groups of blocks, if the number is not three), which can be considered the optimal layout for an inverter built on a modular basis.

The division of the thyristor modules of the rectifier into three groups, located on separate radiators, allows you to create a single cooling system

thyristor and transistor modules. Moreover, the presence of a separate fan for cooling each voltage conversion unit (group of units if the number is not three) and the corresponding group of thyristor modules with blowing along the edges of the radiators allows to achieve high efficiency and reliability of the cooling system of thyristor and transistor modules.

Placing radiators in a special compartment isolated from the power compartment eliminates the risk of contamination of the power compartment elements by extraneous elements that are sucked into the cooling system of the thyristor and transistor modules from the environment.

The possibility of implementing a utility model, characterized by the above set of features, is confirmed by the example of the implementation of a submersible motor control station, made in accordance with this utility model, accompanied by graphic materials that depict the following:

Figure 1 is a front view of a control station with closed doors of the power compartment and the control compartment.

Figure 2 is a side view of the control station.

Figure 3 is a rear view of the control station with closed doors of the cable entry / exit compartment and the compartment of the thyristor and transistor modules cooling system.

Figure 4 - power compartment of the control station (the door of the compartment is not shown).

Figure 5 is a section aa in Figure 4 (compartment doors not shown)

Figure 6 - compartment controls (the compartment door is not shown).

In Fig.7 - compartment input / output cables (door compartment is not shown)

On Fig - circuit diagram of the control station.

The station is designed to control, protect and control the speed of submersible electric motors (SEM) up to 160 kW, which are a three-phase asynchronous squirrel-cage electric motor designed to drive submersible electric pumps for oil production.

The station is designed to operate outdoors at an ambient temperature of minus 60 to plus 50 ° C (the degree of protection of the station from environmental influences is IP43 according to GOST 14254-80).

The power station is supplied from a three-phase AC network with a voltage of 380 V and a frequency of 50 Hz.

The rated current of the power circuit is not more than 630 A, the total output power is 400 kVA.

The station provides an effective value of the output three-phase alternating current with frequency control in the range from 3 to 75 Hz. The power supply of the pump unit electric motor is carried out through a power step-up transformer of the TMPN type (Three-phase Oil Transformer for supplying Submersible Pumps), which is part of the standard surface equipment of the well.

The station provides turning on and off the electric motor either in the "manual" mode directly by the operator or in the "automatic"

program mode. At the same time, the station provides protection of the well equipment during overloads and underloads by current, with increased and reduced voltage of the power supply, with an imbalance in voltage and current, with reduced insulation resistance, with overheating of the motor windings, with increased vibration of the pump unit, etc.

In addition to the control and protection functions, the station, thanks to the frequency converter, performs the following functions: controlling the speed of the electric motor (manual or remote from the control room control panel), smooth acceleration and braking of the engine; soft start during reverse rotation by intercepting the speed, followed by stopping and accelerating to the set frequency; the ability to optimize the well operation mode based on the signals of immersion telemetry, or without it according to a special program; automatic removal of gas plugs in the pumping unit; output to a given frequency according to the program, etc.

The power part of the station is made according to the scheme of a two-stage converter of three-phase alternating current into three-phase current with adjustable frequency and voltage.

The station is built on a modular basis and contains two parallel-connected rectifier sections, which allows to increase the current in the power circuit of the station and the power of the connected equipment without significantly increasing the requirements for the characteristics of the thyristor modules of the rectifier and, accordingly, its cost.

The voltage at the input of each section is supplied through a separate three-phase

throttle. The elements of the frequency converter circuit are combined into three separate voltage conversion blocks, consisting of a frequency converter assembly and a capacitive storage unit, using universal SKiiP type frequency converter assemblies manufactured by SEMIKRON Inc.

The station is made in a metal cabinet 1 two-way service.

The middle part of the cabinet 1 is occupied by the power compartment 2, in which the main nodes are located, designed for voltage conversion, boards with controls, sensors, etc. The front door 3, which allows access to the power compartment, has an electric lock that cuts off the power to the submersible engine when it is opened.

On the rear side of the cabinet in its upper part there is a power cable input-output compartment 4 with a separate door 5, located under a common roof 6 with a power compartment. In compartment 4 there are input 7 and output 8 terminals for connecting the power supply of the station and the primary winding of the step-up transformer, respectively. Also in the compartment is terminal 9 for connecting the neutral wire of the step-up transformer, which is necessary to measure the insulation resistance of the power circuit:

secondary winding TMPN - immersion cable - electric motor. Elements that may be energized are covered by safety shields 10 with warning signs. The compartment is equipped with rubber sealing lips that are secured to the door and rear wall of the compartment.

When closing the door, the jaws crimp the cables, thereby ensuring the sealing of the compartment.

On the rear side of the cabinet there is a compartment 11 of the cooling system of thyristor and transistor modules, the internal volume of which is isolated from the internal volume of the power compartment. Access to the compartment 11 is provided by the rear door 12, mounted on two hinges, however, the rear door can be made in the form of a hinged panel. The dimensions of the door provide the possibility of mounting (dismounting) the equipment of the power compartment on the rear side of the station, which increases the convenience of assembly and repair of the station. The door 12 is locked in the closed position by two rotary locks. A clip block 13 is mounted on the outside of the rear door to secure power cables suitable for the station.

In the lower part of the station, under the power compartment and the compartment of the thyristor and transistor module cooling system, there is a fan compartment 14, in which the fans 15 of the thyristor and transistor module cooling system are located, as well as two three-phase current-limiting chokes 16. One of the walls of the fan compartment is common with the compartment wall 11 and channels (slots) are made in it for the passage of cold air from the fans (not shown in the drawings).

On the front door 3 there is a box of the control compartment 16, which is closed by a separate door 17. In the control compartment there are display elements 18 of the PED operating modes ("STOP", "STANDBY", "WORK"), a 4-line liquid crystal display 19, which displays posts

about the station’s operating conditions, the reasons for its shutdown and the condition of the well equipment, buttons 20 for controlling the controller software, 220 V socket 21, switches 22, operating mode switch 23 and START button 24. The control compartment doors are closed with transparent glass openings 25 for observing display elements without opening the door.

Doors 3, 5 and 12 are locked with special locks and have hermetic seals, as well as stops that lock them in the open position.

In the power compartment 2 posted by the following nodes and elements (see Figure 4).

In the upper right corner of the power compartment of the station installed circuit breaker 26, designed for operational switching and protection of the power circuit from short circuit currents. The lever 27 of the circuit breaker exits through the corresponding hole 28 of the door 3 to the control compartment 16. In addition, the station is equipped with an independent disconnector, which ensures the opening of the power circuit upon command from the controller when the input line voltage of the supply network exceeds the permissible value. Next to the circuit breaker is an automatic power off machine for station 29 auxiliary needs.

Also in the upper right corner of the power compartment are two current transformers 30 (see Fig. 7), included in the circuit of two phases of the supply voltage after the circuit breaker 26 and designed to convert the input current and potential separation of power circuits from

control circuits, while at the terminals of the secondary windings of the transformers, load resistors are installed, from which signals are proportional to the input current of the station.

Along the right wall of the power compartment there are flat tires 31 connecting the circuit breaker 26 with two parallel-connected power chokes 16a and 16b installed on the bottom of the fan compartment and designed to limit the charging current of the inverter capacitors and protect the power network from higher harmonics of the converter.

Each of the chokes 16a and 16b is connected by three flat busbars 32 to the corresponding section 33a and 33b of the adjustable rectifier, designed to convert the power supply voltage to a constant regulated voltage. Each section 33a and 33b consists of three thyristor modules 42. The thyristor modules are combined into three groups of two thyristor modules in a group, with each group of thyristor modules placed on a separate radiator 71, which allows you to create a single cooling system for thyristor and transistor modules. Thus, each thyristor section 33a and 33b includes two thyristor modules from the extreme groups and one module from the middle group of thyristor modules.

The radiators of the thyristor modules are fixed on the racks of the frame of the control station, and the driver boards 34a and 34b of the thyristor modules are fixed on the outer surface of the thyristor modules, which provide phase

control of the corresponding sections of the rectifier.

Directly above the rectifier sections on the racks 35 are fixed three identical voltage conversion units 36, which are included in the power circuit of the station in such a way that their parallel operation is ensured. Each voltage conversion unit consists of a node of the frequency converter 37, mounted on the racks 35 of the frame, and a node of the capacitive drive 38, mounted directly on the node of the frequency converter. This allows you to assemble or repair units 36 outside the station and, if necessary, replace the entire voltage conversion unit.

The node of the capacitive storage 38 is designed to smooth the voltage at the input of the transistor modules of the corresponding node of the frequency converter and includes six capacitors 39 which are mounted in two rows parallel to each other between the bracket 40 for mounting the node of the capacitive storage on one side and two plate buses 41 on the other side . To obtain a margin of voltage, capacitors are connected in parallel in series.

The node of the frequency Converter 37 is designed to convert DC voltage to AC voltage with an adjustable frequency. Thus, an alternating current with an adjustable frequency corresponding to one of the phases of the output current of the station is formed on each of the three nodes 37. The design of the station used universal nodes of the SKiiP type frequency converter manufactured by SEMIKRON Inc. (in particular SKiiP 1813GB123-3DL). Each node 37 includes three transistor

IGWT-module 43 mounted on a finned aluminum radiator 44, a temperature sensor of transistor modules, an output current sensor, designed to generate a signal corresponding to the phase current at the station output (on the primary winding of the TMPN), which is proportional to the current on the windings of the submersible motor, as well as the driver control transistor modules, which generates bipolar pulses for controlling the gate circuits of IGWT modules. On the radiator 44, next to the IGBT modules, a bracket 40 is mounted and means for fixing the block 36 on the racks of the power compartment frame, which are ears (not shown in the drawings) mounted on the radiator so that it is possible to mount the blocks 36 on the racks 35 from the back sides of the station through compartment 11.

The plate busbars 41 (plus and minus) are separated by an insulator layer and connected to the positive and negative terminals of the rectifier sections using two sets of flat tires 45a and 45b. On the side of the plate bus 41 facing the frequency converter assembly, three terminals 46 are made for connection, with positive and negative inputs of IGBT modules. The outputs of the IGBT modules of each block 36 are connected by a common bus 47, with the bus 47 of all three blocks 36 through the corresponding holes in the rear wall of the power compartment (not shown in the drawing) to the output terminals 8 of the input / output compartment of the power cables.

Thus, the power circuit of the station (see Fig. 8) consists of an input unit 7

three-phase voltage of the mains supply, input circuit breaker 26, current transformers 30, set of buses 31, three-phase reactors 16a and 16b, sets of buses 32, sections 33a and 33b of an adjustable rectifier, sets of buses 45a and 45b, three nodes of capacitive storage 38, three conversion nodes voltage 37, three buses 47 and the output node 8 of the output three-phase voltage.

During the operation of the station, the power supply voltage filtered by three-phase current-limiting inductors 16a and 16b is converted into a constant regulated voltage using a two-section adjustable rectifier 33a, 33b. The current at the rectifier output is smoothed using a filter consisting of capacitors 39 of the nodes of the capacitive storage 38. The constant voltage at the output of the nodes 38 is converted into a three-phase alternating voltage with an adjustable frequency using three parallel nodes of the frequency converter 36 and fed through the output node of the output three-phase voltage to primary winding of TMPN, and then through the immersion cable to the motor windings.

In the center of the upper part of the power compartment there is a board for high-voltage dividers of the channel for measuring insulation resistance 48, designed to generate a signal proportional to the insulation resistance of the circuit: TMPN secondary winding - immersion cable - electric motor. High-voltage circuit boards are closed by an insulating cover.

A switch block is installed on the left inner wall of the power compartment

49, consisting of a solid-state relay switching independent disconnector, relay switching fans of the cooling system of thyristor and transistor modules, and relay switching fans intended for ventilation of the power compartment of the control station. Under block 49 on the left wall of compartment 2 are located:

- stabilizer board 50, providing the formation of a supply voltage of auxiliary needs of the station (5 V);

- the interface and switching board 51, intended for distributing the driver control signals of transistor IGBT modules and for interfacing interface interfaces of SKiiP type frequency inverters and a driver control controller for transistor and thyristor modules;

- board lightning protection block 52;

- controller 53 driver control transistor and thyristor modules.

The above nodes are closed by an insulating cover (not shown in the drawing).

In the upper left corner of the power compartment near its rear wall there is a board 54 for overvoltage protection of the fans 15 and a board 55 for voltage dividers, which generates signals proportional to the phase voltages of the supply network and the output line voltage of the station. In front of the board 54 in the upper left corner of the power compartment near its left side wall of the compartment, a place is provided for placing the ground block of the submersible telemetry system and the corresponding throttle. Under the board

55 there is a transformer unit 56, which provides the formation of a voltage of 24 V for powering IGBT modules.

At the bottom of the power compartment there is a discharge unit 60 enclosed by a casing, designed to quickly discharge capacitors catch capacitive storage devices after turning off the station.

The station is controlled by a thyristor and transistor module driver control controller 53 and a pump installation motor controller 57.

The controller 57 is located on the rear side of the front door of the station behind the control compartment (see Fig.6). The controller 57 controls the on / off switch of the submersible motor, determines the frequency and direction of rotation (“DIRECT” or “REVERSE”), as well as the value of the starting torque (“FORCING” or “NORMAL”), based on commands and signals arriving at the station as from the outside (external ban, contact pressure gauge, etc.), and formed in the station itself. After processing the input signals, the controller generates the appropriate control commands.

The elements of the controller 57 are located in a sealed enclosure, protected from the inside by a layer of thermal insulation. The controller has an automatic heating system that maintains a working temperature inside the case of at least minus 4 ° C. On the front panel of the controller are located: display 19, heater on indicator 58, and an COM-port 59 type interface connector. On the side walls of the controller are connectors for connecting the voltage divider board, input transformers (sensors)

current, stabilizer board 50, controller 53, interface and switching board 51, as well as connectors for connecting contact wires from the station controls (mode switch, "START" button, door limit switch) and from the LEDs of the operation mode indication bodies ("STOP" , “WAITING”, “WORK”). Controller 57 also has a connector for connecting controller programming tools.

The thyristor and transistor module driver control controller 53 ensures the coordinated operation of the rectifier section drivers and the frequency converter nodes. The controller 57 generates start pulses in such a way that the ratio of the voltage across the windings of the submersible motor to the frequency is constant over the entire range of rotational speeds of the electric motor, and also increases or decreases this ratio when the corresponding commands are received from the controller 53 (“FORCING” or “NORMAL”). At the end of the operation, the controller 57 removes the start pulses from the drivers of the transistor modules and includes a bit assembly 60 for removing voltage from the capacitors of the capacitive storage nodes. The controller 53 also has connectors for connecting the ground block of the submersible telemetry system and a connector for connecting controller programming tools.

In the lower left part of the power compartment there are two axial type fans 61 designed for ventilation of the power compartment of the station and located on the casing of the discharge unit 60. Six plate heating elements 62 for heating are installed on the frame of the power compartment

transistor modules and two additional heating elements (not shown in the drawings) for heating the internal volume of the station in winter, which are mounted on the rear wall of the casing of the discharge unit near the fans 61.

The control station is equipped with a thyristor and transistor module cooling system, which includes a separate compartment 11 of the thyristor and transistor module cooling system, designed to accommodate radiators 44 of the voltage conversion sides and three radiators of 71 groups of thyristor modules, as well as three pressure fans 15 of a centrifugal type for air supply from the environment to said radiators 44 and 71.

The radiator 44 of each of the three voltage conversion units is located above the radiator 71 of one of the groups of thyristor modules so that the fins of the radiator 44 of the voltage conversion unit 36 are located in line with the fins of the radiator 71 of the group of thyristor modules, while these radiators form the corresponding parts of the common wall of the power compartment 2 and compartment 11 of the cooling system of thyristor and transistor modules. Thus, the internal volume of the compartment 11 is isolated from the internal volume of the compartment 2, which eliminates the entry into the power compartment of extraneous elements carried by the air flows organized in the compartment 11 for cooling radiators 44 and 71.

Fans 15 are placed in compartment 14, the upper wall of which is also the lower wall of compartment 11 and has slots in it, representing

channels for the passage of cold air from the fans 15.

Each of the fans 15 is designed to supply air along the fins of the radiator 44 of one of the voltage conversion units and the radiator 71 of the corresponding group of thyristor modules. The presence of three fans allows for high cooling efficiency without increasing the requirements for the characteristics of the fans.

Parts of all radiators located in the compartment of the cooling system of thyristor and transistor modules are made with vertically oriented fins, while a casing 63 is placed above the radiators 44 and 71 located above each other, covering the finned part of the radiators from the outside and sides, and the lower open side of the casing extended to the lower wall of the compartment 11 and covers the corresponding slots in the lower wall of the compartment 11. Thus, air is supplied from the fans 15 directly into the space between the walls Compliant shroud 63 guide air flow along the edges of radiators 44 and 71, which significantly improves the cooling efficiency of the thyristor and transistor modules.

In the door 12 of the compartment of the cooling system of the thyristor and transistor modules, the windows 64 are closed by a grid for ejecting heated air. At the same time, a reflector 65 is installed in the compartment of the cooling system of the thyristor and transistor modules of the transistor modules to direct the flow of heated air coming out of the casing 63 to the windows 64.

During operation of the station through the shutters 66 on the front wall and closed

with a mesh of openings in the bottom of the fan compartment (not shown in the drawings), the outside air is drawn, which is fed under the covers 63 through said slots in the wall of the fan compartment. In this case, the air flow passing inside the casing 63 first enters the fins of the radiators 71 of the groups of thyristor modules, and then passing along the fins of the radiators 44, the air flow is rejected by the reflector 65 towards the windows 64.

A slot 67 is made in the lower part of the door of the cooling compartment of the thyristor and transistor modules to discharge dust, rainfall, midges and other extraneous elements entering the compartment with the air flow from the fans 15 or through the windows 64. At the same time, an open top cover is fixed on the inside of the door 12 68 (in Fig. 5, the placement of the casing is conventionally shown by a dotted line), the upper part of which is located above the upper end of the casing 63, and the bottom of the casing 68 is beveled towards the slit 67, which is located directly between the side walls of the casing 68 constant proximity to the bottom of the bottom housing, canting angle of which relative to the door plane is about 30 °. Dust, solid precipitation, midges, etc. accumulate in the casing and are gradually carried out of it by a stream of air; in this case, solid precipitation in the form of snow accumulates in the casing and is exposed to heat from the radiators located in compartment 11, which leads to their melting and faster removal from the internal volume of the station.

The cooling and heating means of the station also include a set of temperature sensors, the signals from which are supplied to the controller 57,

ensuring the maintenance of optimal temperature in the compartments of the control station.

The complex of temperature sensors includes:

- temperature sensors of transistor modules, which are part of the nodes of the frequency converter 37 and providing the possibility for the controller to generate commands to turn on the fans 15 when the temperature of the modules rises above + 60 ° C, commands to turn off the fans 15 when the temperature of the transistor modules is subsequently lowered below + 40 ° C, as well as commands for emergency shutdown of the control station if the temperature of the transistor modules exceeds + 115 ° C;

- a semiconductor-type sensor 69 installed in the power compartment and designed to measure the negative temperature range, which makes it possible for the controller 57 to generate commands to turn on the fans 61 when the temperature in the power compartment rises above -10 ° C and commands to turn them off when the temperature drops below - 15 ° C, as well as the prohibition command to turn on the control station if the temperature in the power compartment is below -35 ° C;

- a bimetallic type sensor 70, installed in the power compartment and designed to turn on the electric heating elements 62 and additional heating elements when the temperature in the power compartment drops below + 5 ° C and the signal to turn off the fans 61 when the temperature in the power compartment is subsequently raised above + 10 ° C.

Claims (25)

1. Submersible motor control station, which includes a power compartment, in which thyristor modules are installed on the radiator for converting the power supply voltage to a constant regulated voltage, transistor modules are installed on the radiator for converting DC voltage to an alternating voltage with an adjustable frequency, and capacitors for smoothing the voltage at the input of transistor modules, the control station also contains fans for supplying air from the surroundings environment to the said radiators, characterized in that the thyristor modules are combined into three groups, each of which is located on the corresponding radiator, the control station includes voltage conversion units, the number of which is a multiple of three, while the voltage conversion units are included in the power circuit of the station so so that their parallel operation is ensured, each of the voltage conversion units includes capacitors and transistor modules, as well as a radiator on which transistors are mounted modules, the control station is equipped with a cooling system for thyristor and transistor modules, which includes at least three fans for supplying air to the said radiators and a compartment for the cooling system of thyristor and transistor modules, the internal volume of which is isolated from the internal volume of the power compartment, the radiators of the voltage conversion units and the radiators of the groups of thyristor modules, at least partially, are located in the specified compartment, and at least part of the surface of each of p the radiators located in this compartment are fins, the radiator of each voltage conversion unit is located above the radiator of one of the groups of thyristor modules so that the fins of the radiator of the voltage conversion unit are at least approximately aligned with the radiator fins of the group of thyristor modules, and the cooling system of the thyristor and transistor modules is made in such a way as to ensure air supply along the fins of the radiators. 2. The control station according to claim 1, characterized in that it includes two three-phase current-limiting reactors connected in parallel to the power circuit of the station and two sections of the adjustable rectifier, each of which is connected in series with the corresponding three-phase reactor, sections of the adjustable rectifier consist of thyristor modules in groups located on adjacent radiators. 3. The control station according to claim 1, characterized in that the control station includes three identical voltage conversion units, and the cooling system of the thyristor and transistor modules contains three fans, each of which is designed to supply air along the radiator fins of the voltage conversion unit and the group thyristor modules located one above the other, while these radiators form the corresponding parts of the common wall of the power compartment and the compartment of the cooling system of thyristor and transistor modules. 4. The control station according to claim 3, characterized in that above the radiators of the voltage conversion unit and the group of thyristor modules located one above the other, a casing is placed covering the parts of the radiators located in the compartment of the cooling system of the thyristor and transistor modules from the outside and sides in relation to the direction of air flow, while one of the open end sides of the casing is located in such a way as to provide air from the cooling fan of the thyristor and transistor modules directly directly into the space between the walls of the casing. 5. The control station according to claim 1, characterized in that it contains a fan compartment in which the fans of the thyristor and transistor modules cooling system are located, which are centrifugal fans, one of the walls of the fan compartment is common with the wall of the compartment of the thyristor and transistor modules cooling system and it has channels for the passage of cold air from said fans. 6. The control station according to claim 5, characterized in that the fan compartment is located in the lower part of the station under the power compartment and the cooling system compartment of the thyristor and transistor modules. 7. The control station according to claim 3, characterized in that in the opposite wall of the radiators of the compartment of the cooling system of thyristor and transistor modules, made mesh-closed windows for discharging heated air, while in the compartment of the cooling system of thyristor and transistor modules installed means for directing the flow of heated air passing through radiators towards said windows. 8. The control station according to claim 3, characterized in that in the lower part of the opposite wall of the radiator compartment of the cooling system of the thyristor and transistor modules, a slot is made for the discharge of dust, precipitation, midges and other elements entering the compartment with the air flow from the fans and / or through the windows to release heated air. 9. The control station of claim 8, characterized in that a casing open from above is fixed on the inside of the wall, the upper part of which is located above the radiators of the voltage conversion units, and the bottom of the casing is beveled towards the slit, the slot being located between the side walls of the casing in immediate proximity to the bottom of the bottom of the casing, the bevel angle of which relative to the plane of the compartment wall is not more than 45 °. 10. The control station according to claim 9, characterized in that the bevel angle of the bottom of the casing is in the range from 25 to 35 °. 11. The control station according to any one of claims 1, 7 and 8, characterized in that the compartment of the cooling system of the thyristor and transistor modules is equipped with a door, the dimensions of which allow at least one voltage conversion unit assembly and / or to pass through it one group of thyristor modules mounted on a radiator. 12. The control station according to claim 11, characterized in that the compartment door of the cooling system of the thyristor and transistor modules forms a compartment wall opposite to the radiators. 13. The control station according to claim 1, characterized in that the three-phase current-limiting chokes are located in the fan compartment. 14. The control station according to claim 1, characterized in that the voltage conversion unit comprises a frequency converter assembly including transistor modules and a radiator on which transistor modules are mounted. 15. The control station according to claim 16, characterized in that the frequency converter assembly includes a temperature sensor of transistor modules, which makes it possible to generate a command to turn on the fans of the cooling system of thyristor and transistor modules when the temperature rises above the first specified value, a command to turn off the system fans cooling of thyristor and transistor modules with a subsequent decrease in the temperature of transistor modules below the second specified value, as well as emergency commands disabling the station if the temperature control transistor modules above a third predetermined value. 16. The control station according to clause 15, wherein the first predetermined temperature is + 60 ° C, the second predetermined temperature is + 40 ° C, the third predetermined temperature is + 115 ° C. 17. The control station of claim 14, wherein the frequency converter assembly includes an output current sensor. 18. The control station of claim 14, wherein the frequency converter assembly includes a driver for controlling transistor modules. 19. The control station according to claim 1, characterized in that the voltage conversion unit comprises a capacitive storage unit including capacitors of the voltage conversion unit. 20. The control station according to claim 1, characterized in that the axial type fans are installed in the power compartment for ventilation of the internal volume of the power compartment of the control station. 21. The control station according to claim 20, characterized in that a semiconductor type temperature sensor is installed in the power compartment, designed to measure the negative temperature range and provides the ability to generate a command to turn on fans intended for ventilation of the internal volume of the power compartment, when the temperature rises in the power compartment above the fourth setpoint, the signal to turn off the fans with a subsequent decrease in temperature below the fifth setpoint and the ban on Operation of the control station if the temperature in the power compartment is below the sixth setpoint. 22. The control station according to 21, characterized in that the fourth predetermined temperature is -10 ° C, the fifth predetermined temperature is -15 ° C, the sixth predetermined temperature is -35 ° C. 23. The control station according to claim 1, characterized in that the electric compartment has electric heating elements for heating the transistor modules and the internal volume of the control station. 24. The control station according to claim 23, characterized in that a second bimetallic temperature sensor is installed in the power compartment, designed to turn on the electric heating elements when the temperature in the power compartment drops below the seventh predetermined value and turn off the electric heating elements when the temperature in the power compartment is subsequently raised higher eighth of a given value. 25. The control station according to paragraph 24, wherein the seventh predetermined temperature is + 5 ° C, the eighth predetermined temperature is + 10 ° C.