CN217282229U - Reactive power compensation device and rectification system - Google Patents

Reactive power compensation device and rectification system Download PDF

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Publication number
CN217282229U
CN217282229U CN202221126253.XU CN202221126253U CN217282229U CN 217282229 U CN217282229 U CN 217282229U CN 202221126253 U CN202221126253 U CN 202221126253U CN 217282229 U CN217282229 U CN 217282229U
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open contact
alternating current
normally
voltage
coil
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刘超
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Gansu Yueneng Energy Saving Equipment Co ltd
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Gansu Yueneng Energy Saving Equipment Co ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

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Abstract

An embodiment of the utility model provides a reactive power compensation device and rectification system. The device comprises a control module and a controlled module, wherein the control module comprises a voltage control unit and a current control unit, the voltage control unit comprises a voltage coil and a voltage normally open contact, and the current control unit comprises a current coil and a current normally open contact; the controlled module comprises a plurality of controlled sub-modules in one-to-one correspondence with windings of the rectifier transformer, each controlled sub-module comprises a parallel capacitor, a reactor and an alternating current contactor, and the alternating current contactor comprises an alternating current coil and an alternating current normally open contact. The voltage control unit and/or the current control unit controls the AC contactor to be closed, so that the parallel capacitor is connected to the corresponding output winding, and reactive power compensation is provided for the rectifying system through the parallel capacitor.

Description

Reactive power compensation device and rectification system
Technical Field
The utility model relates to an electric power system field particularly, relates to a reactive power compensation device and rectification system.
Background
The rectifier transformer is a power transformer specially used for a rectifier system, and the rectifier system is characterized in that a primary side inputs a circuit, and a secondary side outputs current after passing through a rectifier element. The rectifier transformer can provide proper voltage for the rectifier system and can also reduce the pollution of waveform distortion caused by the rectifier system to a power grid. The rectifier transformer for medium frequency electric furnace is one rectifier transformer for providing rectifier power source to medium frequency electric furnace.
In the prior art, an intermediate frequency electric furnace rectifier transformer mainly improves power factors of scenes such as intermediate frequency induction heating, intermediate frequency smelting, intermediate frequency heating modulation or casting devices by means of an electrothermal capacitor connected in parallel to a rectifier system, and if the power factor of the rectifier system during working is lower than a standard value, the rectifier system needs to absorb reactive power from a power grid to compensate the reactive power of the intermediate frequency electric furnace rectifier transformer in the system.
However, the scheme in the prior art increases the transmission of reactive power of the power grid to the rectification system, and increases the reactive flow in the power supply line, thereby causing the waste of power transmission space and electric energy of the power grid.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a reactive power compensation device to the not enough among the above-mentioned prior art, realized the reactive power compensation to the rectification system.
In order to achieve the above object, the embodiment of the present invention adopts the following technical solutions:
in a first aspect, the present invention provides a reactive power compensation device, the device includes: the device comprises a control module and a controlled module;
the control module includes: the voltage control unit comprises a voltage coil and a voltage normally-open contact, and the current control unit comprises a current coil and a current normally-open contact;
the controlled module comprises: a plurality of controlled sub-modules in one-to-one correspondence with windings of a rectifier transformer in the rectifier system, each of the controlled sub-modules comprising: the device comprises a capacitor, a reactor and an alternating current contactor which are connected in parallel, wherein the alternating current contactor comprises an alternating current coil and an alternating current normally open contact;
a voltage coil of the voltage control unit is connected to a voltmeter of the rectification system, and a current coil of the current control unit is connected to an ammeter of the rectification system;
one end of the voltage normally-open contact is used for being connected with a live wire of a power supply, the other end of the voltage normally-open contact is connected with one end of an alternating current coil of the alternating current contactor in each controlled submodule, and the voltage control unit is used for controlling the voltage normally-open contact to be closed when the voltage of the voltmeter is measured to be smaller than the preset voltage;
one end of the current normally-open contact is used for being connected with a live wire of a power supply, the other end of the current normally-open contact is connected with one end of an alternating current coil of the alternating current contactor in each controlled submodule, and the current control unit is used for controlling the current normally-open contact to be closed when the measured current of the ammeter is smaller than the preset current;
the other end of each alternating current coil of the alternating current contactor is connected with a zero line of a power supply, the parallel capacitor is connected with one end of the reactance, the other end of the reactance is connected with one end of an alternating current normally open contact of the alternating current contactor, the other end of the alternating current normally open contact of the alternating current contactor is connected to a corresponding winding, and the alternating current contactor is used for controlling the alternating current normally open contact to be closed when the voltage normally open contact is closed and/or the current normally open contact is closed so as to perform reactive power compensation on the rectifier transformer through the corresponding winding.
Optionally, the control module further includes: an intermediate relay;
the intermediate relay comprises an intermediate coil and an intermediate normally open contact;
one end of a coil of the intermediate relay is connected with the other end of the voltage normally open contact and the other end of the current normally open contact, and the other end of the coil of the intermediate relay is used for being connected with a zero line of a power supply;
one end of an intermediate normally-open contact of the intermediate relay is connected with the other end of the voltage normally-open contact and the other end of the current normally-open contact, and the other end of the intermediate normally-open contact of the intermediate relay is connected with one end of an alternating current coil of the alternating current contactor in each controlled submodule;
the other end of the voltage normally-open contact is connected with one end of an alternating current coil of the alternating current contactor in each controlled submodule through an intermediate normally-open contact of the intermediate relay;
and the other end of the current normally-open contact is connected with one end of an alternating current coil of the alternating current contactor in each controlled submodule through an intermediate normally-open contact of the intermediate relay.
Optionally, the control module further includes: a manual switch unit;
one end of the manual switch unit is used for being connected with a live wire of a power supply, and the other end of the manual switch unit is connected with one end of a middle normally open contact of the intermediate relay.
Optionally, the control module further includes: a safety unit;
one end of the safety unit is used for being connected with a live wire of a power supply, and the other end of the safety unit is respectively connected with one end of the voltage normally open contact, one end of the current normally open contact and one end of the manual switch unit.
Optionally, each controlled sub-module further includes: a circuit breaker;
one end of the breaker is connected with the other end of the alternating current normally open contact, and the other end of the breaker is connected to the corresponding winding;
and the other end of the alternating current normally open contact is connected to the corresponding winding through the circuit breaker.
Optionally, the reactance includes: a first reactance, a second reactance, and a third reactance;
one end of the first reactance is connected with the first end of the parallel capacitor, one end of the second reactance is connected with the second end of the parallel capacitor, and one end of the third reactance is connected with the third end of the parallel capacitor;
the other end of the first reactance, the other end of the second reactance and the other end of the third reactance are respectively connected to one end of an alternating current normally open contact of the alternating current contactor.
Optionally, the controlled module includes: a first controlled submodule and a second controlled submodule, the rectifier transformer comprising: a first winding and a second winding;
the first controlled submodule corresponds to the first winding, and the second controlled submodule corresponds to the second winding.
In a second aspect, the present invention provides a rectifier system, the system includes the reactive power compensation device of the first aspect, a rectifier transformer, a rectifier cabinet, a voltmeter, an ammeter, and a load;
the rectifier transformer, the voltmeter, the ammeter and the load are respectively connected with the rectifier cabinet. Optionally, the rectification system further includes: a plurality of capacitors;
the capacitors are connected in parallel and are respectively connected with the rectifier cabinet and the load.
Optionally, the load includes: an electric furnace.
The utility model has the advantages that:
by arranging the control module and the controlled module, the control module comprises a voltage control unit and a current control unit, the voltage control unit comprises a voltage coil and a voltage normally-open contact, and the current control unit comprises a current coil and a current normally-open contact; the controlled module comprises a plurality of controlled sub-modules corresponding to windings of the rectifier transformer one by one, each controlled sub-module comprises a parallel capacitor, a reactor and an alternating current contactor, and the alternating current contactor comprises an alternating current coil and an alternating current normally open contact; a voltage coil of the voltage control unit is connected to a voltmeter of the rectification system, and a current coil of the current control unit is connected to an ammeter of the rectification system; one end of the voltage normally open contact is used for connecting a live wire of a power supply, the other end of the voltage normally open contact is connected with one end of an alternating current coil of an alternating current contactor in each controlled submodule, one end of the current normally open contact is used for connecting the live wire of the power supply, the other end of the current normally open contact is connected with one end of the alternating current coil of the alternating current contactor in each controlled submodule, the other end of the alternating current coil of the alternating current contactor is connected with a zero line of the power supply, a parallel capacitor is connected with one end of a reactance, the other end of the reactance is connected with one end of the alternating current normally open contact of the alternating current contactor, and the other end of the alternating current normally open contact of the alternating current contactor is connected to a corresponding winding. The voltage control unit and/or the current control unit are/is used for controlling the AC contactor to be closed, so that the parallel capacitors are connected into the corresponding output windings, the parallel capacitors are used for providing reactive power compensation for the rectifying system, the transmission of the reactive power of the rectifying system by a power grid is not needed, and the reactive power flowing in a power supply line and the waste of power transmission space and electric energy of the power grid are avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a reactive power compensation device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a control module according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another control module according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another reactive power compensation device provided in the embodiment of the present invention;
fig. 5 is a schematic structural diagram of a rectification system according to an embodiment of the present invention.
Detailed Description
In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solution in the embodiments of the present invention, it should be understood that the drawings in the present invention only serve the purpose of illustration and description, and are not used to limit the protection scope of the present invention. Additionally, it should be understood that the schematic drawings are not necessarily drawn to scale. The flow chart used in the present invention shows the operation according to some embodiments of the present invention. It should be understood that the operations of the flow diagrams may be performed out of order, and steps without logical context may be performed in reverse order or simultaneously. One skilled in the art, under the direction of the present disclosure, may add one or more other operations to, or remove one or more operations from, the flowchart.
In addition, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that, if the terms "upper", "lower", "inner", "outer", etc. indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the products of the present invention are used, the description is only for convenience of description and simplification, but the indication or suggestion that the indicated device or element must have a specific position, be constructed and operated in a specific orientation, and thus, should not be interpreted as a limitation of the present invention.
Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
The power factor is an important index of the rectifier transformer system of the medium frequency furnace in the working process, and the required standard value of the power factor can be 0.9, for example.
In the prior art, the reactive power compensation of the rectifier system mainly depends on the electric heating capacitor connected in parallel in the rectifier transformer system of the intermediate frequency electric furnace for compensation, for example, the rectifier transformer system of the intermediate frequency electric furnace, the whole working process of the rectifier transformer system of the intermediate frequency electric furnace is an intermittent working system, and the relation between the whole working process and the power factor is as follows:
step one, electrifying a rectifier transformer of the intermediate frequency electric furnace, wherein the rectifier transformer at the step is in an idle state, and measuring the power factor at the step to be 0.32; step two, a thyristor pipeline of the intermediate frequency electric furnace is filled with water and reflows, the rectification voltage transformation of the step is in an idle load state, and the power factor of the step is measured to be 0.32; step three, the medium-frequency electric furnace starts to heat, the rectifier transformer is in a light-load state at the step, and the power factor at the step is measured to be 0.55; stage four, the medium-frequency electric furnace is normally heated for production, the rectifier transformer is in a full-load state at the stage, and the power factor measured at the stage is more than 0.9; and step five, heating is suspended in the production process due to process factors or problems of equipment debugging, maintenance and the like, the rectifier transformer is in an idle state in the step, and the power factor in the step is measured to be 0.32.
According to the relation between the whole working stage of the medium-frequency electric furnace rectifier transformer system and the power factor, the fact that under the no-load state and the light-load state of the rectifier transformer, the power factor of the rectifier transformer is lower than 0.9, the electric heating capacitor is ineffective in reactive power compensation of the medium-frequency electric furnace rectifier transformer system, and therefore the medium-frequency electric furnace rectifier transformer system needs to absorb reactive power of a power grid in large quantity to perform reactive power compensation of the medium-frequency electric furnace rectifier transformer system.
However, the technical scheme of absorbing reactive power from the power grid increases the transmission of the reactive power of the power grid to the rectification system, aggravates the reactive flow in the power supply line, and causes the waste of power transmission space and electric energy of the power grid.
Therefore, when the rectifier transformer is in an unloaded state or a light-loaded state, namely when the intermediate frequency furnace stops heating or is in a preheating stage, the embodiment of the application performs reactive power compensation on the rectifier transformer of the intermediate frequency furnace in the stage by providing a reactive power compensation device.
Referring to fig. 1, which is a schematic structural diagram of a reactive power compensation device according to an embodiment of the present invention, the device is used for performing reactive power compensation on a rectification system, and as shown in fig. 1, the device may include: a control module 10 and a controlled module 11.
The rectifier system may be, for example, the rectifier transformer system of the intermediate frequency furnace.
Optionally, the control module 10 may include a voltage control unit 101 and a current control unit 102, wherein the voltage control unit 101 may include a voltage coil 1011 and a voltage normally open contact 1012, and the current control unit 102 may include a current coil 1021 and a current normally open contact 1022.
For example, the voltage coil 1011 and the voltage normally open contact 1012 may correspond to a voltage relay, and then after the coil of the voltage relay is pulled by the power relay, the normally open contact of the voltage relay is closed; the current coil 1021 and the current normally open contact 1022 can correspond to a current relay, and after the coil of the current relay is attracted by the current relay, the normally open contact of the current relay is closed.
Optionally, the controlled module 11 may include a plurality of controlled sub-modules 111 corresponding to windings of the rectifier transformer in the rectifier system, and each controlled sub-module 111 may include a parallel capacitor 1111, a reactor 1112, and an ac contactor 1113, where the ac contactor 1113 includes an ac coil 11131 and an ac normally open contact 11132. Fig. 1 illustrates the case of a controlled submodule 111.
The rectifier transformer can comprise a primary coil and a secondary coil, wherein the primary coil can be a high-voltage input side, the primary coil is a group of windings, the windings of the primary coil are three-phase windings, the secondary coil can be a low-voltage output side, the secondary coil can be two groups of output windings generally, one group can be a star winding connection method, one group can be a triangular winding connection method, and then each output winding is also a three-phase output winding; in the embodiment of the present application, each output winding of the rectifier transformer corresponds to one controlled submodule 111, and the connection structures of the controlled submodules 111 are consistent and work synchronously.
The following embodiment is described with respect to a connection structure of the controlled sub-module 111.
Referring to fig. 1, a voltage coil 1011 of a voltage control unit 101 is connected to a voltmeter of a rectification system, and a current coil 1021 of a current control unit 102 is connected to an ammeter of the rectification system.
Specifically, the voltage coil 1011 of the voltage control unit 101 may be connected in parallel with a voltmeter of the rectifier system, where the voltmeter of the rectifier system is connected in a dc loop of the rectifier system, and is used to measure a voltage value in the dc loop of the rectifier system and determine a working state of the rectifier system; the current coil 1021 of the current control unit 102 may be connected in series with an ammeter of the rectification system, where the ammeter of the rectification system is connected in a dc loop of the rectification system, and is used to measure a current value in the dc loop of the rectification system, and to determine an operating state of the rectification system.
With reference to fig. 1, one end of the voltage normally-open contact 1012 is used to connect to a live wire of a power supply, and the other end of the voltage normally-open contact 1012 is connected to one end of an ac coil 11131 of an ac contactor 1113 in each controlled sub-module 111, specifically, one end of the voltage normally-open contact 1012 may be connected to the live wire of the power supply by using a lead, and the other end of the voltage normally-open contact 1012 may be connected to one end of the ac coil 11131 of the ac contactor 1113 in each controlled sub-module 111 by using a lead, where when the voltage control unit 101 measures that the voltage of the voltmeter is smaller than a preset voltage, the voltage normally-open contact 1012 is controlled to be closed, so that the ac coil 11131 of the ac contactor 1113 can be powered.
For example, the power supply may be a 220v control power supply, which provides operating power for the control module.
For example, if the voltage value of the voltmeter connected in parallel to the voltage coil 1011 of the voltage control unit 101 is smaller than the voltage when the rectifier transformer in the rectifier system is in the no-load or light-load state, that is, the intermediate frequency furnace in the rectifier system stops heating or preheating, the voltage in this stage is smaller than the preset voltage, the voltage coil 1011 of the voltage control unit 101 is attracted, the corresponding voltage normally-open contact 1012 is changed from the normally-open state to the closed state, and the ac coil 11131 of the ac contactor 1113 is attracted electrically from the power supply.
For example, if the voltage value of the voltmeter connected in parallel to the voltage coil 1011 of the voltage control unit 101 has an operating voltage when the rectifier transformer in the rectifier system is in a full load state, that is, the intermediate frequency furnace in the rectifier system is normally heated, the voltage in this stage is greater than a preset voltage, the voltage coil 1011 of the voltage control unit 101 is opened, the corresponding voltage normally-open contact 1012 is changed from a closed state to an open state, and the ac coil 11131 of the ac contactor 1113 is powered off at this time.
Continuing to refer to fig. 1, one end of the current normally-open contact 1022 is used to connect to a live wire of a power supply, the other end of the current normally-open contact 1022 is connected to one end of the ac coil 11131 of the ac contactor 1113 in each controlled sub-module 111, specifically, one end of the current normally-open contact 1022 may be connected to the live wire of the power supply by using one conducting wire, and the other end of the current normally-open contact 1022 may be connected to one end of the ac coil of the ac contactor 1113 in each controlled sub-module 111 by using one conducting wire, wherein when the current control unit 102 is used to measure the current of the ammeter is less than the preset current, the current normally-open contact 1022 is controlled to be closed, so that the ac coil 11131 of the ac contactor 1113 may be powered.
For example, if a rectifier transformer in the rectifier system is in an idle load state or a light load state, that is, when the intermediate frequency electric furnace in the rectifier system is suspended from heating or is preheated, a current value of an ammeter connected in series with a current coil 1021 of the current control unit 102 is smaller than a current, the current in this stage is smaller than a preset current, the current coil 1021 of the current control unit 102 is attracted, a corresponding current normally-open contact 1022 is changed from a normally-open state to a closed state, and an ac coil 11131 of the ac contactor 1113 is electrified from the power supply and attracted.
For example, if the rectifier transformer in the rectifier system is in a full load state, that is, when the intermediate frequency furnace in the rectifier system is normally heated, the current value of the ammeter connected in series with the current coil 1021 of the current control unit 102 has an operating current, the current in this stage is greater than the preset current, the current coil 1021 of the current control unit 102 is opened, the corresponding current normally-open contact 1022 is changed from the closed state to the open state, and the ac coil 11131 of the ac contactor 1113 loses power at this time.
With continued reference to fig. 1, the other end of the ac coil 11131 of the ac contactor 1113 is connected to the zero line of the power supply, the parallel capacitor 1111 is connected to one end of the reactance 1112, the other end of the reactance 1112 is connected to one end of the ac normally open contact 11132 of the ac contactor 1113, and the other end of the ac normally open contact 11132 of the ac contactor 1113 is connected to the corresponding output winding, wherein the ac contactor 1113 is configured to control the ac normally open contact 11132 to be closed when the voltage normally open contact 1012 and/or the current normally open contact 1022 are closed, and then the parallel capacitor 1111 and the reactance 1112 are connected to the corresponding winding, so that the parallel capacitor 1111 performs reactive power compensation to the rectifier transformer.
Specifically, the other end of the ac coil 11131 of the ac contactor 1113 may be connected to the zero line of the power supply through a wire, the parallel capacitor 1111 may be connected to one end of the reactance 1112 through a wire, the other end of the reactance 1112 may be connected to one end of the ac normally open contact 11132 of the ac contactor 1113 through a wire, and the other end of the ac normally open contact 11132 of the ac contactor 1113 may be connected to the corresponding output winding through a wire.
In this embodiment, by setting a control module and a controlled module, the control module includes a voltage control unit and a current control unit, the voltage control unit includes a voltage coil and a voltage normally open contact, and the current control unit includes a current coil and a current normally open contact; the controlled module comprises a plurality of controlled sub-modules corresponding to windings of the rectifier transformer one by one, each controlled sub-module comprises a parallel capacitor, a reactor and an alternating current contactor, and the alternating current contactor comprises an alternating current coil and an alternating current normally open contact; a voltage coil of the voltage control unit is connected to a voltmeter of the rectification system, and a current coil of the current control unit is connected to an ammeter of the rectification system; one end of the voltage normally open contact is used for connecting the live wire of the power supply, the other end of the voltage normally open contact is connected with one end of the alternating current coil of the alternating current contactor in each controlled submodule module, one end of the current normally open contact is used for connecting the live wire of the power supply, the other end of the current normally open contact is connected with one end of the alternating current coil of the alternating current contactor in each controlled submodule module, the other end of the alternating current coil of the alternating current contactor is connected with the zero line of the power supply, the parallel capacitor is connected with one end of the reactance, the other end of the reactance is connected with one end of the alternating current normally open contact of the alternating current contactor, and the other end of the alternating current normally open contact of the alternating current contactor is connected to the corresponding winding. The voltage control unit and/or the current control unit controls the AC contactor to be closed, so that the parallel capacitor is connected to the corresponding output winding, and reactive power compensation is provided for the rectifying system through the parallel capacitor.
Please refer to fig. 2, which is a schematic structural diagram of a control module according to an embodiment of the present invention, as shown in fig. 2, the control module may further include: an intermediate relay 103.
Optionally, the intermediate relay 103 may include an intermediate coil 1031 and an intermediate normally-open contact 1032, wherein when the intermediate coil 1031 electrically engages, the corresponding intermediate normally-open contact 1032 may change an originally opened state to a closed state.
With continued reference to fig. 2, one end of the intermediate coil 1031 of the intermediate relay 103 is connected to the other end of the voltage normally-open contact 1012 and the other end of the current normally-open contact 1022, respectively, and specifically, one end of the intermediate coil 1031 may be connected to the other end of the voltage normally-open contact 1012 and the other end of the current normally-open contact 1022, respectively, through a conducting wire; the other end of the intermediate coil 1031 of the intermediate relay 103 is used for connecting with the zero line of the power supply, and specifically, the other end of the intermediate coil 1031 may be connected with the zero line of the power supply through a wire.
With continued reference to fig. 2, one end of the intermediate normally-open contact 1032 of the intermediate relay 103 is connected to the other end of the voltage normally-open contact 1012 and the other end of the current normally-open contact 1022, specifically, one end of the intermediate normally-open contact 1032 may be connected to the other end of the voltage normally-open contact 1012 and the other end of the current normally-open contact 1022 respectively through wires, the other end of the intermediate normally-open contact 1032 of the intermediate relay is connected to one end of the ac coil 11131 of the ac contactor 1113 in each controlled sub-module 111, and specifically, the other end of the intermediate normally-open contact 1032 may be connected to one end of the ac coil 11131 through a wire.
With continued reference to fig. 2, the other end of the voltage normally-open contact 1012 may be connected to one end of the ac coil 11131 of the ac contactor 1113 in each controlled sub-module 111 through the intermediate normally-open contact 1032 of the intermediate relay 103, and the other end of the current normally-open contact 1022 may be connected to one end of the ac coil 11131 of the ac contactor 1113 in each controlled sub-module 111 through the intermediate normally-open contact 1032 of the intermediate relay 103, so that the actuation or the disconnection of the ac coil 11131 of the ac contactor 1113 is controlled through the intermediate normally-open contact 1032 of the intermediate relay 103.
In this embodiment, the normally open contact of the intermediate relay is set to control the attraction or disconnection of the coil of the ac contactor, so that relay protection and transmission of control signals in the circuit can be realized.
Referring to fig. 3, which is a schematic structural diagram of another control module according to an embodiment of the present invention, as shown in fig. 3, the control module 10 may further include: a manual switch unit 104.
Alternatively, the manual switch unit 104 may be a normally open contact of a manual switch, and specifically, the normally open contact of the manual switch may be connected in parallel with a manual current adjusting switch in the rectifier system, wherein the manual current adjusting switch is used for manually adjusting a current value in a direct current loop in the rectifier system.
Referring to fig. 3, one end of the manual switch unit 104 is used for connecting a live wire of a power supply, the other end of the manual switch unit 104 is respectively connected with one end of an intermediate normally open contact 1032 of the intermediate relay 103, the other end of a current normally open contact 1022 and the other end of a voltage normally open contact 1012, specifically, the other end of the manual switch unit 104 may be respectively connected with the other end of the current normally open contact 1022 and the other end of the voltage normally open contact 1012 through wires, and then the other end of the manual switch unit 104, the other end of the current normally open contact 1022 and the other end of the voltage normally open contact 1012 are connected with one end of the intermediate normally open contact 1032 of the intermediate relay 103 through wires.
For example, if the rectifier transformer in the rectifier system is in an idle or light load state, that is, when the intermediate frequency furnace in the rectifier system is suspended from heating or preheating, the normally open contact of the manual switch unit 104 may be manually controlled to be switched from the normally open state to the closed state, so that the actuation of the ac coil 11131 of the ac contactor 1113 is controlled through the intermediate normally open contact 1032 of the intermediate relay 103, and the reactive power compensation is performed on the rectifier transformer through the parallel capacitor 1111 in the corresponding controlled submodule 111.
For example, if a rectifier transformer in the rectifier system is in a full load state, that is, when an intermediate frequency furnace in the rectifier system is normally heated, the normally open contact of the manual switch unit 104 may be manually controlled to be switched from a closed state to an open state, so that the intermediate coil 1031 of the intermediate relay 103 loses power, the intermediate normally open contact 1032 is correspondingly opened, so that the ac coil 11131 of the ac contactor 1113 loses power, and the parallel capacitor 1111 in the corresponding controlled sub-module 111 does not perform reactive power compensation on the rectifier transformer any more at this time.
Optionally, the normally open contact of the manual switch unit 104, the voltage normally open contact 1012 and the current normally open contact 1022 may be connected in parallel, the attraction or the disconnection of the intermediate normally open contact 1032 of the intermediate relay 103 may be controlled together, the attraction or the disconnection of the intermediate normally open contact 1032 of the intermediate relay 103 may also be controlled separately, then, if the normally open contact of the manual switch unit 104, when any one of the normally open contacts of the voltage normally open contact 1012 and the current normally open contact 1022 satisfies the threshold condition, the intermediate coil 1031 of the intermediate relay 103 is powered on, and the intermediate normally open contact 1032 may be correspondingly closed.
In this embodiment, by setting the manual switch unit, the reactive power compensation of the parallel capacitor can be controlled by the change of the heating current or the heating voltage, and the manual control can be performed under the field production condition, or the integrated control of the three can be performed.
With continued reference to fig. 3, the control module 10 may also include a fuse unit 105.
The fuse unit 105 may specifically use a fuse, and when the circuit in the control module 10 is abnormal, the circuit components can be timely turned off, so as to ensure that the circuit is not damaged.
Optionally, one end of the safety unit 105 is used for connecting to a live wire of the power supply, and the other end of the safety unit 105 is connected to one end of the manual switch unit 104, one end of the current normally-open contact 1022, and one end of the voltage normally-open contact 1012, respectively.
Referring to fig. 4, which is a schematic structural diagram of another reactive power compensation apparatus according to an embodiment of the present invention, as shown in fig. 4, the controlled submodule 111 further includes a circuit breaker 1114.
Optionally, one end of the breaker 1114 is connected to the other end of the ac normally-open contact 11132, the other end of the breaker 1114 is connected to the corresponding output winding of the rectifier transformer, and then the other end of the ac normally-open contact 11132 is connected to the corresponding output winding through the breaker 1114.
Specifically, rectifier transformer's output winding is a three-phase winding, correspond three output lines, then circuit breaker 1114 can include a plurality of normally open contacts, then can select three normally open contact to be connected with rectifier transformer's output winding's each output line respectively from a plurality of normally open contacts in circuit breaker 1114, then each normally open contact's of circuit breaker 1114 the other end respectively with rectifier transformer's output winding's each output line connection, circuit breaker 1114 each normally open contact's one end and each exchange normally open contact 11132's the other end and be connected, wherein, ac contactor 1113 can include a plurality of interchange normally open contact 11132.
In this embodiment, protection of the device in the circuit can be achieved by connecting the circuit breaker in the circuit.
With continued reference to fig. 4, the reactance may further include: a first reactance 11121, a second reactance 11122, and a third reactance 11123.
Optionally, one end of the first reactance 11121 is connected to the first end of the parallel capacitor 1111, one end of the second reactance 11122 is connected to the second end of the parallel capacitor 1111, and the third reactance 11123 is connected to the third end of the parallel capacitor 1111; the other end of the first reactance 11121, the other end of the second reactance 11122 and the other end of the third reactance 11123 are respectively connected to one end of an ac normally-open contact 11132 of the ac contactor 1113, specifically, the ac contactor 1113 may include a plurality of ac normally-open contacts 11132, and then the other end of the first reactance 11121, the other end of the second reactance 11122 and the other end of the third reactance 11123 may be respectively connected to one end of each three ac normally-open contacts 11132 in the ac contactor 1113 through wires.
With continued reference to FIG. 4, the controlled sub-modules may include a first controlled sub-module and a second controlled sub-module.
Optionally, the rectifier transformer includes a first winding and a second winding, where the first winding and the second winding refer to a first output winding and a second output winding of the rectifier transformer, and each output winding includes three output lines.
Optionally, the first controlled sub-module corresponds to the first output winding, the second controlled sub-module corresponds to the second output winding, wherein, the first controlled submodule comprises a first AC contactor 1113, the second controlled submodule comprises a second AC contactor 1115, then, in the control module, the alternating current coil 11131 of the first alternating current contactor and the alternating current coil 11151 of the second alternating current contactor are connected in parallel, the alternating current coil 11131 of the first alternating current contactor and the alternating current coil 11151 of the second alternating current contactor can work synchronously, the closing or opening of the alternating current coil 11131 of the first alternating current contactor and the alternating current coil 11151 of the second alternating current contactor can be controlled according to any one of the voltage control unit 101, the current control unit 102 and the manual switch unit 104, so that the normally open contact 11132 of the corresponding first ac contactor 1113 and the normally open contact 11152 of the second ac contactor 1115 are closed or opened.
Optionally, the second controlled sub-module may further include a fourth reactance 11124, a fifth reactance 11125, and a sixth reactance 11126; a shunt capacitor 1116; and the breaker 1117, wherein the connection mode between each component is consistent with the connection mode between the first controlled sub-modules, which is not described herein again.
Fig. 5 is a schematic structural diagram of a rectification system according to an embodiment of the present invention, as shown in fig. 5: the system may include a rectifier transformer 20, a rectifier cabinet 21, a voltmeter 22, an ammeter 23, a load 24, and a control module 10 and a controlled module 11.
Optionally, the rectifier transformer 20, the voltmeter 22, the ammeter 23, and the load 24 are respectively connected to the rectifier cabinet 21.
The rectifier transformer 20 provides voltage to the rectifier system, the rectifier transformer 20 is connected to the rectifier cabinet 21, and dc power can be provided to the rectifier system through the rectifier cabinet, so that the voltmeter 22 and the ammeter 23 can be connected to a dc loop provided through the rectifier cabinet, and used for measuring voltage and current in the dc loop; the load connected to the rectifier cabinet 21 may be operated by a dc power supplied from the rectifier cabinet.
With continued reference to fig. 5, the system may further include a plurality of capacitors.
The capacitors are connected in parallel and are respectively connected with the rectifier cabinet and the load.
Optionally, the load may be an electric furnace, the voltage and the current in the dc loop may change according to different operating states of the electric furnace, and when the circuit is normally heated, the reactive power compensation may be performed on the rectification system through a capacitor connected in parallel with the capacitor.
The above is only the embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention.

Claims (10)

1. A reactive power compensation apparatus for reactive power compensation of a rectifier system, the apparatus comprising: the control module and the controlled module;
the control module includes: the voltage control unit comprises a voltage coil and a voltage normally-open contact, and the current control unit comprises a current coil and a current normally-open contact;
the controlled module comprises: a plurality of controlled sub-modules in one-to-one correspondence with windings of a rectifier transformer in the rectifier system, each of the controlled sub-modules comprising: the device comprises a capacitor, a reactor and an alternating current contactor which are connected in parallel, wherein the alternating current contactor comprises an alternating current coil and an alternating current normally open contact;
a voltage coil of the voltage control unit is connected to a voltmeter of the rectification system, and a current coil of the current control unit is connected to an ammeter of the rectification system;
one end of the voltage normally-open contact is used for being connected with a live wire of a power supply, the other end of the voltage normally-open contact is connected with one end of an alternating current coil of the alternating current contactor in each controlled submodule, and the voltage control unit is used for controlling the voltage normally-open contact to be closed when the voltage of the voltmeter is measured to be smaller than the preset voltage;
one end of the current normally-open contact is used for being connected with a live wire of a power supply, the other end of the current normally-open contact is connected with one end of an alternating current coil of the alternating current contactor in each controlled submodule, and the current control unit is used for controlling the current normally-open contact to be closed when the measured current of the ammeter is smaller than the preset current;
the other end of each alternating current coil of the alternating current contactor is connected with a zero line of a power supply, the parallel capacitor is connected with one end of the reactance, the other end of the reactance is connected with one end of an alternating current normally open contact of the alternating current contactor, the other end of the alternating current normally open contact of the alternating current contactor is connected to a corresponding winding, and the alternating current contactor is used for controlling the alternating current normally open contact to be closed when the voltage normally open contact is closed and/or the current normally open contact is closed so as to perform reactive power compensation on the rectifier transformer through the corresponding winding.
2. The reactive power compensation apparatus of claim 1, wherein the control module further comprises: an intermediate relay;
the intermediate relay comprises an intermediate coil and an intermediate normally open contact;
one end of a coil of the intermediate relay is connected with the other end of the voltage normally open contact and the other end of the current normally open contact, and the other end of the coil of the intermediate relay is used for being connected with a zero line of a power supply;
one end of an intermediate normally-open contact of the intermediate relay is connected with the other end of the voltage normally-open contact and the other end of the current normally-open contact, and the other end of the intermediate normally-open contact of the intermediate relay is connected with one end of an alternating current coil of the alternating current contactor in each controlled submodule;
the other end of the voltage normally-open contact is connected with one end of an alternating current coil of the alternating current contactor in each controlled submodule through an intermediate normally-open contact of the intermediate relay;
and the other end of the current normally-open contact is connected with one end of an alternating current coil of the alternating current contactor in each controlled submodule through an intermediate normally-open contact of the intermediate relay.
3. The reactive power compensation apparatus of claim 2, wherein the control module further comprises: a manual switch unit;
one end of the manual switch unit is used for being connected with a live wire of a power supply, and the other end of the manual switch unit is connected with one end of a middle normally open contact of the intermediate relay.
4. The reactive power compensation apparatus of claim 3, wherein the control module further comprises: a safety unit;
one end of the safety unit is used for being connected with a live wire of a power supply, and the other end of the safety unit is respectively connected with one end of the voltage normally open contact, one end of the current normally open contact and one end of the manual switch unit.
5. The reactive power compensation device of any one of claims 1-4, wherein each controlled sub-module further comprises: a circuit breaker;
one end of the breaker is connected with the other end of the alternating current normally open contact, and the other end of the breaker is connected to the corresponding winding;
and the other end of the alternating current normally open contact is connected to the corresponding winding through the circuit breaker.
6. Reactive power compensation device according to any of claims 1-4, characterized in that the reactance comprises: a first reactance, a second reactance, and a third reactance;
one end of the first reactance is connected with the first end of the parallel capacitor, one end of the second reactance is connected with the second end of the parallel capacitor, and one end of the third reactance is connected with the third end of the parallel capacitor;
the other end of the first reactance, the other end of the second reactance and the other end of the third reactance are respectively connected to one end of an alternating current normally open contact of the alternating current contactor.
7. Reactive power compensation apparatus according to any of claims 1-4, characterized in that the controlled module comprises: a first controlled submodule and a second controlled submodule, the rectifier transformer comprising: a first winding and a second winding;
the first controlled submodule corresponds to the first winding, and the second controlled submodule corresponds to the second winding.
8. A rectification system, characterized in that the rectification system comprises: a rectifier transformer, a rectifier cabinet, a voltmeter, an ammeter, a load, and the reactive power compensation device of any one of claims 1-7;
the rectifier transformer, the voltmeter, the ammeter and the load are respectively connected with the rectifier cabinet.
9. The fairing system as recited in claim 8, further comprising: a plurality of capacitors;
the capacitors are connected in parallel and are respectively connected with the rectifier cabinet and the load.
10. The commutation system of claim 8 or 9, wherein the load comprises: an electric furnace.
CN202221126253.XU 2022-05-10 2022-05-10 Reactive power compensation device and rectification system Active CN217282229U (en)

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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
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