CN215681805U - Low-voltage reactive power compensation device - Google Patents

Abstract

The embodiment of the application provides a low-voltage reactive power compensation device, and relates to the technical field of reactive power compensation. The low-voltage reactive power compensation device comprises a current sampling component, a synchronous switching switch electrical appliance component, a reactor component, a capacitor component and a control component; the current sampling assembly is connected with a power supply bus; the synchronous switching switch electric appliance component is connected with the current sampling component; the reactor component is connected with the synchronous switching switch electrical appliance component; the capacitor component is connected with the reactor component; the control assembly is respectively connected with the current sampling assembly, the synchronous switching switch electric appliance assembly, the reactor assembly and the capacitor assembly. The low-voltage reactive power compensation device can improve the power factor while realizing reactive power compensation, eliminate the influence of higher harmonics on a system and improve the technical effect of power utilization quality.

Description

Low-voltage reactive power compensation device

Technical Field

The application relates to the technical field of reactive power compensation, in particular to a low-voltage reactive power compensation device.

Background

At present, the installation quantity of the existing integrated low-voltage reactive compensation modules is more generally in a user power distribution room, after the integrated low-voltage reactive compensation modules are operated for a period of time, particularly after a capacitor fails or the capacity is attenuated, a power distribution manager cannot timely know the conditions and process the conditions, and finally the power distribution power factor is possibly low, the reactive loss is increased, and fine is caused due to insufficient reactive compensation. Even some capacitors are not put into operation for a long time or are over-compensated for a long time due to low management level and insufficient attention on reactive compensation.

In the prior art, in the traditional field, power distribution management personnel need to know about the running condition of a capacitor and must check the capacitor in a power distribution room at regular time every day, so that the workload of the power distribution management personnel is greatly increased. Even though the monitoring of the field capacitor operation state can be realized by a wired network monitoring mode, the installation cost and the management cost are greatly increased because a large number of power cables need to be laid in the early stage of construction. Due to cost reasons, the traditional wired monitoring mode is not easy to popularize especially in user distribution. The operating temperature and the harmonic waves are main factors influencing the service life of the capacitor, the traditional integrated low-voltage reactive compensation module can measure the operating temperature but cannot measure the current harmonic content of the capacitor body, namely, the current harmonic waves cannot be effectively protected.

SUMMERY OF THE UTILITY MODEL

An object of the embodiment of the application is to provide a low-voltage reactive power compensation device, when can realize reactive power compensation, improve power factor, can eliminate the influence of higher harmonic to the system again, improve the technical effect of power consumption quality.

The embodiment of the application provides a low-voltage reactive power compensation device which comprises a current sampling assembly, a synchronous switching switch electrical appliance assembly, a reactor assembly, a capacitor assembly and a control assembly;

the current sampling assembly is connected with a power supply bus;

the synchronous switching switch electric appliance component is connected with the current sampling component;

the reactor component is connected with the synchronous switching switch electrical appliance component;

the capacitor component is connected with the reactor component;

the control assembly is respectively connected with the current sampling assembly, the synchronous switching switch electric appliance assembly, the reactor assembly and the capacitor assembly.

In the implementation process, the low-voltage reactive power compensation device effectively inhibits higher harmonics and inrush current through the current sampling component, the synchronous switching switch electrical appliance component, the reactor component, the capacitor component and the control component, forms a low-impedance path for the higher harmonics, has an absorption and discharge effect on the harmonics, can eliminate the influence of the higher harmonics on the capacitor, protects a circuit and prevents the capacitor from overloading, and prevents the phenomena of overheating of the capacitor, aging of an insulating medium, reduction of self-healing performance, reduction of service life and the like; the low-voltage reactive power compensation device can meet reactive power compensation, improve power factor, eliminate the influence of higher harmonics on a system and improve power utilization quality.

Furthermore, the synchronous switching switch electric appliance component comprises a first synchronous switching switch and a second synchronous switching switch, and the first synchronous switching switch and the second synchronous switching switch are connected in parallel.

In the implementation process, the first synchronous switching switch and the second synchronous switching switch can respectively control the connection or disconnection of different low-voltage reactive power compensation paths.

Further, the reactor component comprises a first reactor and a second reactor, the first reactor is connected with the first synchronous switching switch and the capacitor component respectively, and the second reactor is connected with the second synchronous switching switch and the capacitor component respectively.

In the implementation process, the first reactor and the second reactor can respectively form independent low-voltage reactive compensation paths with different capacitors in the capacitor assembly.

Further, the capacitor assembly comprises a common compensation capacitor assembly and a branch compensation capacitor assembly, the common compensation capacitor assembly is connected with the first reactor, and the branch compensation capacitor assembly is connected with the second reactor.

In the implementation process, the common compensation capacitor component and the first reactor form a common compensation low-voltage reactive compensation passage, and the sub compensation capacitor component and the second reactor form a compensation low-voltage reactive compensation passage.

Further, the device also includes a temperature sensor disposed inside the capacitor assembly.

In the above implementation, the temperature sensor may monitor the temperature of each capacitor in the capacitor assembly.

Further, the control assembly comprises a control module and a monitoring module, the control module is connected with the monitoring module, and the monitoring module is respectively connected with the current sampling assembly, the synchronous switching switch electric appliance assembly, the reactor assembly and the capacitor assembly.

In the implementation process, the control component monitors and controls the current sampling component, the synchronous switching switch electrical appliance component, the reactor component and the capacitor component through the control module and the monitoring module, and the safe operation of the low-voltage reactive power compensation device is guaranteed.

Furthermore, the control assembly also comprises an online module, and the online module is connected with the control module.

In the implementation process, the control component has an online function by setting the online module, and for example, wired network communication and/or wireless network communication can be performed.

Further, the control assembly is in communication connection with the capacitor assembly through RS-485.

In the implementation process, the RS-485 communication connection enables the control component 500 and the capacitor component 400 to have a communication function, so that a large amount of sampling data can be uploaded conveniently, information can be exchanged with external equipment in monitoring, and system operation is formed.

Further, the capacitor assembly is a low voltage power capacitor assembly.

Further, the device also comprises a circuit breaker, and the current sampling assembly is connected with the power supply bus through the circuit breaker.

In the implementation process, the circuit breaker can cut off and switch on a load circuit and cut off a fault circuit, so that the accident is prevented from being enlarged, and the safe operation is ensured.

Additional features and advantages of the disclosure will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the above-described techniques.

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a low-voltage reactive power compensation device provided in an embodiment of the present application;

fig. 2 is a schematic structural diagram of a control assembly according to an embodiment of the present application.

Icon: 100-a current sampling component; 200-synchronous switching electrical appliance components; 210-a first synchronous fling-cut switch; 220-a second synchronous fling-cut switch; 300-a reactor assembly; 310-a first reactor; 320-a second reactor; 400-a capacitor assembly; 410-a co-complement capacitor component; 420-divide and complement capacitor assembly; 500-a control component; 510-a control module; 520-a monitoring module; 530-online module; 600-a power supply bus; 700-circuit breaker.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

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. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.

The embodiment of the application provides a low-voltage reactive power compensation device which can be applied to a power distribution room for reactive power compensation and power distribution power factor adjustment; the low-voltage reactive power compensation device effectively inhibits higher harmonics and inrush current through the current sampling component, the synchronous switching switch electrical appliance component, the reactor component, the capacitor component and the control component, forms a low-impedance path for the higher harmonics, has an absorption and discharge effect on the harmonics, can eliminate the influence of the higher harmonics on the capacitor, protects a circuit and prevent the capacitor from being overloaded, and prevents the phenomena of overheating of the capacitor, aging of an insulating medium, reduction of self-healing performance, reduction of service life and the like; the low-voltage reactive power compensation device can meet reactive power compensation, improve power factor, eliminate the influence of higher harmonics on a system and improve power utilization quality.

Therefore, the low-voltage reactive power compensation device has a filtering function, effectively suppresses high-order harmonics and inrush current, and forms a low-impedance path for the high-order harmonics. The filter has the functions of absorbing and discharging harmonic waves and can eliminate the influence of higher harmonic waves on the capacitor; the surge-free switching function is realized: the switch is matched with a special capacitor switching switch, and no switching inrush current exists; has the phase splitting compensation function: in the split-phase compensation type product, each capacitor can be switched respectively, so that the reactive compensation precision is improved, and the three-phase reactive imbalance is well compensated; therefore, the reactive compensation is realized, the power factor is improved, the influence of higher harmonics on a system can be eliminated, and the power quality is improved.

Referring to fig. 1 and fig. 2, fig. 1 is a schematic structural diagram of a low-voltage reactive power compensation device according to an embodiment of the present application, and fig. 2 is a schematic structural diagram of a control assembly according to an embodiment of the present application; the low-voltage reactive power compensation device comprises a current sampling component 100, a synchronous switching switch electrical appliance component 200, a reactor component 300, a capacitor component 400, a control component 500 and a power supply bus 600 connected with the current sampling component 100;

illustratively, the current sampling assembly 100, the synchronous switching switch electrical component 200, the reactor component 300, the capacitor component 400 and the control component 500 together form a resonance-suppression intelligent capacitor.

Illustratively, the control assembly 500 may make distribution voltage, current, reactive power, power factor, etc. measurements. The current sampling assembly 100 includes a current transformer for collecting the current compensation condition of the low-voltage reactive power compensation device and feeding back the current compensation condition to the control assembly 500.

Illustratively, the synchronous fling-cut switch electrical component 200 is connected with the current sampling component 100.

For example, the synchronous fling-cut switch appliance assembly 200 can cause the contacts of the mechanical switch to close or open at the proper phase time.

Illustratively, the synchronous switching electrical appliance assembly 200 serves as a switching part of the whole device, and receives a switching signal sent by the control assembly 500 to perform a switching action (the control assembly 500 may detect a voltage phase to implement zero-crossing switching control on the synchronous switch).

Illustratively, the reactor assembly 300 is connected with the synchronous fling-cut switch electrical assembly 200.

Illustratively, the reactor assembly 300 performs a filtering function throughout the loop; alternatively, the reactor assembly 300 may select 7% or 14% for filtering 5 th or 3 rd order harmonics.

Illustratively, in the reactor assembly 300, a reactor is also called an inductor, and when a conductor is energized, a magnetic field is generated in a certain space occupied by the conductor, so that all electric conductors capable of carrying current have a general inductive property. However, the inductance of the electrified long straight conductor is small, and the generated magnetic field is not strong, so that the actual reactor is in a mode that a conducting wire is wound into a solenoid, and is called as an air-core reactor; in order to make this solenoid have a larger inductance, a core, called a core reactor, is sometimes inserted into the solenoid.

Exemplarily, the capacitor assembly 400 is connected with the reactor assembly 300.

Illustratively, the capacitor assembly 400 is used for reactive compensation of the power grid by accessing the power grid to generate capacitive reactive power; optionally, a temperature sensor is disposed inside the capacitor of the capacitor assembly 400, and the real-time temperature inside the capacitor is transmitted to the control portion, so as to implement monitoring and protection.

Illustratively, capacitor assembly 400 includes two conductors in close proximity to each other with a non-conductive dielectric therebetween, which form a capacitor. When a voltage is applied across the two plates of the capacitor, the capacitor stores charge. The capacitance of the capacitor is numerically equal to the ratio of the amount of charge on one conductive plate to the voltage between the two plates. The basic unit of capacitance of a capacitor is farad (F). The capacitor element is generally denoted by letter C in the circuit diagram.

Illustratively, the control assembly 500 is connected with the current sampling assembly 100, the synchronous switching device assembly 200, the reactor assembly 300 and the capacitor assembly 400, respectively.

Illustratively, the control component 500 is a CPU of the whole device, and functions to control, detect, and coordinate the work of the whole system, and has functions of working state display, protection control, and the like.

Illustratively, the control component 500 may monitor the current sampling component 100, the synchronous switching device component 200, the reactor component 300 and the capacitor component 400 in real time, so as to ensure the normal operation of the whole low-voltage reactive power compensation device.

In some embodiments, the low-voltage reactive power compensation device effectively inhibits higher harmonics and inrush current by arranging the current sampling component 100, the synchronous switching switch electrical appliance component 200, the reactor component 300, the capacitor component 400 and the control component 500, forms a low-impedance path for the higher harmonics, has an absorption and discharge effect on the harmonics, can eliminate the influence of the higher harmonics on the capacitor, protects a circuit and overload of the capacitor, and prevents the phenomena of overheating of the capacitor, aging of an insulating medium, reduction of self-healing performance, reduction of service life and the like. The reactive compensation can be met, the power factor is improved, the influence of higher harmonics on a system can be eliminated, and the power utilization quality is improved.

Illustratively, the synchronous fling-cut switch electrical assembly 200 includes a first synchronous fling-cut switch 210 and a second synchronous fling-cut switch 220, and the first synchronous fling-cut switch 210 and the second synchronous fling-cut switch 220 are connected in parallel.

For example, the first synchronous switching switch 210 and the second synchronous switching switch 220 may respectively control the connection or disconnection of different low-voltage reactive power compensation paths.

Illustratively, the reactor assembly 300 includes a first reactor 310 and a second reactor 320, the first reactor 310 is connected to the first synchronous switching switch 210 and the capacitor assembly 400, respectively, and the second reactor 320 is connected to the second synchronous switching switch 220 and the capacitor assembly 400, respectively.

Illustratively, the first reactor 310 and the second reactor 320 may respectively constitute independent low-voltage reactive power compensation paths with different capacitors in the capacitor assembly 400.

Illustratively, the capacitor assembly 400 includes a co-compensation capacitor assembly 410 and a sub-compensation capacitor assembly 420, the co-compensation capacitor assembly 410 is connected to the first reactor 310, and the sub-compensation capacitor assembly 420 is connected to the second reactor 320.

Illustratively, the co-compensation capacitor component 410 and the first reactor 310 form a co-compensation low-voltage reactive compensation path, and the sub-compensation capacitor component 420 and the second reactor 320 form a sub-compensation low-voltage reactive compensation path.

Illustratively, the co-compensation low-voltage reactive compensation path comprises a three-phase capacitor and is used for compensating the three-phase circuit simultaneously; the branch compensation low-voltage reactive compensation path comprises a single-phase capacitor and is used for compensating the single phase. The advantages of co-compensation are as follows: the control is simple, the price is low, the reliability is good, the overhaul and the maintenance are convenient, and the requirement on the compensation controller is low. The deficiency of the co-supplementation: in the case of three-phase imbalance, the imbalance cannot be compensated or is compensated more. The advantage of branch mend: the device can cope with unbalanced occasions and has high compensation precision. The deficiency of separate compensation: the price is high, the control is complex, and the circuit is complex. The difficulty of maintenance is great. The requirements on the compensation controller are high.

Illustratively, the low-voltage reactive power compensation device has the following characteristics through connection cooperation between the reactor assembly 300 and the capacitor assembly 400 of the synchronous switching switch appliance assembly 200: the filtering function, effectual system high order harmonic and surge form the low impedance route to the higher harmonic, have the absorption effect of releasing to the harmonic, can eliminate the influence of higher harmonic to the condenser. The split-phase compensation function is realized, and various capacitors of the split-phase compensation type product can be switched respectively, so that the reactive compensation precision is improved, and the three-phase reactive imbalance is well compensated; the surge-free switching function is matched with a special capacitor switching switch, and no switching surge current exists.

Illustratively, the low-voltage reactive power compensation device further comprises a temperature sensor, and the temperature sensor is arranged inside the capacitor assembly 400.

Illustratively, temperature sensors may monitor the temperature of each capacitor within the capacitor assembly 400.

In some embodiments, the low-voltage reactive power compensation device realizes the measurement function by arranging the current sampling assembly 100, a temperature sensor and other measurement components: measuring distribution voltage, current, reactive power and power factor; automatically measuring and correcting the CT phase and change ratio; and measuring the three-phase current and the internal temperature of each capacitor. It should be understood that other measurement components may be added to the low-voltage reactive power compensation device to achieve measurement and monitoring of other parameters, and are not described herein again.

Illustratively, the control assembly 500 includes a control module 510 and a monitoring module 520, the control module 510 is connected with the monitoring module 520, and the monitoring module 520 is respectively connected with the current sampling assembly 100, the synchronous switching device assembly 200, the reactor assembly 300 and the capacitor assembly 400.

Illustratively, the control module 500 monitors and controls the current sampling assembly 100, the synchronous switching device assembly 200, the reactor assembly 300 and the capacitor assembly 400 through the control module 510 and the monitoring module 520, so as to ensure the safe operation of the low-voltage reactive power compensation device.

In some embodiments, the control assembly 500 is provided with a protection module having protection functions: loop current and overcurrent protection; the capacitor is subjected to overvoltage and undervoltage protection; the over-temperature, phase failure and three-phase unbalance protection of the capacitor are realized, when the temperature of the capacitor exceeds 65 ℃, the whole capacitor is removed from the machine for protection, the service life is prolonged, and the safe operation of the system is ensured.

In some embodiments, the control assembly 500 is provided with a signal module having the signal function: switching state, over-under-compensation state and over-under-voltage state signals of the capacitor; protection action type, self-diagnostic fault type signal.

Illustratively, the control assembly 500 further includes an online module 530, and the online module 530 is connected to the control module 510.

Illustratively, the control component 500 has an online function by setting the online module 530, for example, wired network communication and/or wireless network communication can be performed.

In some embodiments, the control component 500, through the control module 510 and the online module 530, may implement intelligent network control: the reactive change of the system can be automatically detected and tracked, and the capacitor bank can be automatically switched. And the capacitors with the same capacity are switched according to a compensation principle. The capacitor is thrown first and retreated first, and thrown first and retreated first; the capacitor is firstly switched on when the operation temperature is low and is firstly switched off when the operation temperature is high; when the compensation working condition is constant, the capacitor is switched circularly every fifteen minutes, so that the long-time operation of a single capacitor is avoided.

In some embodiments, the control assembly 500 provides a fault self-diagnosis module having a fault self-diagnosis function: the intelligent control element of the capacitor can perform self-diagnosis on each operation parameter of the body, and once a self-diagnosis fault occurs, the whole machine is quickly influenced and quits operation.

Illustratively, the control assembly 500 is communicatively coupled to the capacitor assembly 400 via RS-485.

Illustratively, the RS-485 communication connection enables the control module 500 and the capacitor module 400 to have a communication function, so as to facilitate uploading of a large amount of sampling data and information exchange with external equipment monitoring, thereby forming system operation.

Illustratively, the capacitor assembly is a low voltage power capacitor assembly.

Illustratively, the low-voltage reactive power compensation device further comprises a circuit breaker 700, and the current sampling assembly 100 is connected with the power supply bus 600 through the circuit breaker 700.

Illustratively, the circuit breaker 700 can cut off and make a load circuit, and cut off a fault circuit, prevent an accident from being expanded, and ensure safe operation.

In some embodiments, the low-voltage reactive power compensation device provided by the embodiments of the present application has the following functions:

zero crossing switching: an intelligent zero-crossing switching circuit is adopted to realize equal-voltage input, zero-current cutting, no inrush current impact during switching, no operation overvoltage and no arc reignition;

phase splitting compensation: single-phase compensation is realized, and the unbalanced condition of three-phase load is solved;

temperature protection: the temperature sensor is matched, so that the internal heating of the capacitor can be reflected under the conditions of overcurrent, over-harmonic, overlarge leakage current, overhigh environment temperature and the like of the capacitor, the overtemperature protection is realized, the capacitor is automatically cut off after the overtemperature exceeds the set temperature, the operation is quitted, and the purpose of protecting equipment is achieved;

intelligent network: when a plurality of intelligent integrated power capacitors are networked, a network is automatically generated, wherein the smallest address is a host, and the rest are slaves, so that a low-voltage reactive automatic control system is formed; if the individual slave machine fails, the automatic exit does not affect the rest work, and if the master machine fails, the exit is also needed, and a new master machine is generated in the rest slave machines to form a new system (key point); the capacitors with the same capacity are switched according to a cyclic switching principle; the 485 communication interface is connected to a background computer for carrying out comprehensive power distribution management;

building block structure: the product is standardized and modularized, the cabinet is assembled by adopting building blocks to stack, the capacity expansion is convenient, and the installation is convenient.

Exemplarily, the low-voltage reactive power compensation device provided by the embodiment of the application has the functions of a high-grade electric energy analyzer, complete functions and good performance; optionally, multiple peripherals may be configured to meet different customer needs.

In some embodiments, the low-voltage reactive power compensation device provided by the embodiment of the application can be used in a multi-block mode, a host is automatically generated when a plurality of slave units are used, the rest slave units are slave units to form a reactive power automatic control system, and the slave units with individual faults automatically exit without influencing the work of other machines. The host machine automatically exits due to faults, a new host machine is generated, a new system is formed to work, and the intelligent degree is extremely high.

In the several embodiments provided in the present application, it should be understood that the functional modules in the respective embodiments may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.

The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application. 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.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Claims (10)

1. A low-voltage reactive power compensation device is characterized by comprising a current sampling component, a synchronous switching switch electrical appliance component, a reactor component, a capacitor component and a control component;

the current sampling assembly is connected with a power supply bus;

the synchronous switching switch electric appliance component is connected with the current sampling component;

the reactor component is connected with the synchronous switching switch electrical appliance component;

the capacitor component is connected with the reactor component;

the control assembly is respectively connected with the current sampling assembly, the synchronous switching switch electric appliance assembly, the reactor assembly and the capacitor assembly.

2. The low-voltage reactive power compensation device according to claim 1, wherein the synchronous switching switch electrical component comprises a first synchronous switching switch and a second synchronous switching switch, and the first synchronous switching switch and the second synchronous switching switch are connected in parallel.

3. The low-voltage reactive power compensation device according to claim 2, wherein the reactor component comprises a first reactor and a second reactor, the first reactor is respectively connected with the first synchronous switching switch and the capacitor component, and the second reactor is respectively connected with the second synchronous switching switch and the capacitor component.

4. The low-voltage reactive power compensation device according to claim 3, wherein the capacitor assembly comprises a co-compensation capacitor assembly and a sub-compensation capacitor assembly, the co-compensation capacitor assembly is connected with the first reactor, and the sub-compensation capacitor assembly is connected with the second reactor.

5. The low voltage reactive compensation device of claim 1, further comprising a temperature sensor disposed inside the capacitor assembly.

6. The low-voltage reactive power compensation device according to claim 1, wherein the control component comprises a control module and a monitoring module, the control module is connected with the monitoring module, and the monitoring module is respectively connected with the current sampling component, the synchronous switching device component, the reactor component and the capacitor component.

7. The low voltage reactive power compensation device of claim 6, wherein the control assembly further comprises an online module, and the online module is connected with the control module.

8. The low-voltage reactive power compensation device according to claim 7, wherein the control component is connected with the capacitor component through RS-485 communication.

9. The low voltage reactive power compensation device of claim 1, wherein the capacitor assembly is a low voltage power capacitor assembly.

10. The low voltage reactive compensation device of claim 1, further comprising a circuit breaker through which the current sampling assembly is connected to the supply bus.

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