Efficient reactive power compensation device

Abstract

The utility model discloses an efficient reactive power compensation device. The device comprises a cabinet body, a switch assembly and a reactive compensation assembly. The cabinet body is internally provided with a power-in copper bar, and one end is connected with a power-in cable. The switch assembly comprises an isolating switch and a first operating rod, the isolating switch is arranged in the cabinet body, one end of the first operating rod is connected to the isolating switch, and the other end of the first operating rod is used for executing driving operation, so that the isolating switch is driven by the first operating rod to be switched between an on state and an off state; the reactive compensation assembly is arranged in the cabinet body and comprises a vacuum contactor, a current transformer, a capacitor and a reactor which are electrically connected in sequence; wherein one end of the isolating switch is connected to the other end of the power inlet copper bar, and the other end is connected to the vacuum contactor. According to the technical scheme, when the reactive compensation assembly needs to be overhauled or maintained, the isolating switch can be disconnected through the operating rod, and the reactive compensation assembly is completely isolated from the power supply, so that the risk of electric shock of operators is avoided, and the safety of the device is improved.

Description

Technical Field

[0001] This application relates to the field of power system technology, and in particular to a high-efficiency reactive power compensation device. Background Technology

[0002] Reactive power compensation cabinets, as key equipment in power systems, effectively improve the power factor of the power grid and reduce transmission losses by dynamically adjusting the connection and disconnection of capacitors or inductors. However, with the increase in power grid capacity and complexity, the operational safety of reactive power compensation cabinets has become increasingly prominent. In existing technologies, reactive power compensation cabinets typically rely on circuit breakers to achieve circuit switching, but circuit breakers cannot fully meet the safety isolation requirements during equipment maintenance, fault isolation, and handling of abnormal operating conditions.

[0003] Therefore, improving the safety isolation performance of existing reactive power compensation cabinets is an urgent problem to be solved. Utility Model Content

[0004] This application provides a high-efficiency reactive power compensation device, which aims to solve the safety problem of reactive power compensation cabinets in the prior art.

[0005] To achieve the above objectives, this application proposes a high-efficiency reactive power compensation device, which includes:

[0006] The cabinet contains a power supply copper busbar, one end of which is connected to the power supply cable.

[0007] The switch assembly includes an isolating switch and a first operating lever. The isolating switch is disposed inside the cabinet. One end of the first operating lever is connected to the isolating switch, and the other end is used to perform a driving operation to switch the isolating switch between a conducting state and an open state.

[0008] A reactive power compensation component is installed inside the cabinet and includes a vacuum contactor, a current transformer, a capacitor, and a reactor that are connected in sequence.

[0009] The disconnecting switch has one end connected to the other end of the power supply copper busbar and the other end connected to the vacuum contactor. When the disconnecting switch is in the conducting state, it connects the power supply copper busbar to the reactive power compensation component, and when the disconnecting switch is in the disconnected state, it disconnects the power supply copper busbar from the reactive power compensation component.

[0010] In some embodiments, the disconnecting switch includes:

[0011] Mounting base;

[0012] A first contact head and a second contact head are spaced apart on the mounting base. The first contact head is connected to the power supply copper busbar, and the second contact head is connected to the vacuum contactor.

[0013] The first contact piece has one end rotatably connected to the second contact head, and a transmission mechanism is provided in its middle to connect to the first operating lever. Under the drive of the first operating lever, the first contact piece is driven to rotate through the transmission mechanism, and the other end of the first contact piece overlaps with the first contact head, or the overlap relationship between the first contact piece and the first contact head is released.

[0014] In some embodiments, the transmission mechanism includes:

[0015] A first rotating shaft is hinged to one end of the first operating lever to rotate under the drive of the first operating lever;

[0016] The first transmission rod has one end fixedly connected to the first rotating shaft so as to rotate with the first rotating shaft;

[0017] The second transmission rod is hinged at one end to the first transmission rod and at the other end to the middle of the contact piece.

[0018] In some embodiments, the switch assembly further includes a second operating lever and a grounding switch. The grounding switch includes a second rotating shaft disposed on the mounting base and a second contact piece connected to the second rotating shaft. The second rotating shaft is hinged to one end of the second operating lever to rotate under the drive of the second operating lever, and to cause the other end of the second contact piece to overlap with the second contact head, or to release the overlap relationship between the second contact piece and the second contact head.

[0019] The second contact piece is grounded.

[0020] In some embodiments, the mounting base includes a first horizontal plate, a second horizontal plate, and a third horizontal plate spaced apart in the vertical direction, wherein the space between the first horizontal plate and the second horizontal plate, and the space between the second horizontal plate and the third horizontal plate, are hollowed out.

[0021] The first contact head is disposed on the first horizontal plate, the second contact head is disposed on the second horizontal plate, the first rotating shaft is disposed corresponding to the hollow area between the first horizontal plate and the second horizontal plate, and the second rotating shaft is disposed corresponding to the hollow area between the second horizontal plate and the third horizontal plate.

[0022] In some embodiments, a plurality of mounting beams are arranged longitudinally and transversely within the cabinet, and the switch assembly and the reactive power compensation assembly are mounted on the mounting beams so that the switch assembly and the reactive power compensation assembly are arranged vertically within the cabinet.

[0023] In some embodiments, the power busbar and the switch assembly are disposed near the top of the cabinet, and the power cable is connected from the bottom of the cabinet;

[0024] The cabinet has a cable inlet hole at the bottom, and a tower-shaped sealing ring is provided to seal the cable inlet hole. A cable clamp is provided between the bottom and top of the cabinet to hold the power cable.

[0025] In some embodiments, the power busbar and the switch assembly are disposed near the top of the cabinet, and the power cable is connected from the side of the cabinet;

[0026] The cabinet has a side opening and an insulator at the top. The power cable is connected to the insulator from the side of the cabinet and then to the power busbar.

[0027] In some embodiments, the reactive power compensation component further includes a discharge coil connected in parallel to the capacitor.

[0028] In some embodiments, a surge arrester is also provided inside the cabinet to protect the reactive power compensation component from damage caused by lightning overvoltage and operational overvoltage.

[0029] This application proposes a high-efficiency reactive power compensation device, which includes a cabinet, a switch assembly, and a reactive power compensation component. The cabinet houses a power-in copper busbar, one end of which is connected to the power cable. The switch assembly includes a disconnect switch and a first operating lever. The disconnect switch is located within the cabinet, and one end of the first operating lever is connected to the disconnect switch, while the other end is used to perform a drive operation, switching the disconnect switch between an on and off state. The reactive power compensation component, also located within the cabinet, includes a vacuum contactor, a current transformer, a capacitor, and a reactor connected in sequence. One end of the disconnect switch is connected to the other end of the power-in copper busbar, and the other end is connected to the vacuum contactor. This application's technical solution, by placing a switch assembly between the power-in copper busbar and the reactive power compensation component, achieves switching control of the reactive power compensation component. When the reactive power compensation component requires inspection or maintenance, the disconnect switch can be disconnected via the operating lever, completely isolating the reactive power compensation component from the power supply, avoiding the risk of electric shock to operators, and improving the safety of the device. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0031] Figure 1 This is a schematic diagram of the structure of a high-efficiency reactive power compensation device according to an embodiment of this application after the cabinet sealing plate has been removed;

[0032] Figure 2 This is a schematic diagram of the structure of a switch assembly according to an embodiment of this application;

[0033] Figure 3 This is a schematic diagram of the cabinet structure after the sealing plate is removed, according to an embodiment of this application. Detailed Implementation

[0034] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0035] It should be noted that, unless otherwise stated or limited, all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0036] It should also be noted that, unless otherwise stated or limited, when an element is referred to as "fixed to" or "set on" another element, it may be directly on the other element or there may be an intervening element present. When an element is referred to as "connected to" another element, it may be directly connected to the other element or there may be an intervening element present.

[0037] Furthermore, unless otherwise stated or limited, the descriptions involving "first," "second," etc., in this application are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0038] See Figure 1 as well as Figure 2 As shown, this application proposes a high-efficiency reactive power compensation device 100, which includes a cabinet 10, a switch assembly 20, and a reactive power compensation assembly 30. Wherein:

[0039] Cabinet 10 serves as the supporting and protective structure for the entire reactive power compensation device, providing an operating environment for the internal components. Cabinet 10 houses a power inlet copper busbar 110, one end of which connects to the power cable. The primary function of the power inlet copper busbar 110 is to efficiently and stably transmit the electrical energy introduced by the power cable to the reactive power compensation component 30. Understandably, in a three-phase current system, the power inlet copper busbar 110 typically has three independent power inlet copper busbars 110 for phases A, B, and C to ensure independent transmission of electrical energy in each phase. Similarly, the connection methods between other components in the energy storage device also follow the connection principles of a three-phase current system to ensure proper and coordinated operation of each component, which will not be elaborated further below.

[0040] A reactive power compensation component 30, housed within cabinet 10, is responsible for generating or absorbing reactive power to compensate for reactive power deficits or excesses in the power grid. This component 30 includes a vacuum contactor 31, a current transformer 32, a capacitor 33, and a reactor 34, connected in sequence. The vacuum contactor 31 acts as a switching switch for the capacitor bank 33, enabling flexible connection or isolation between the capacitor bank 33 and the power grid by rapidly connecting or disconnecting the circuit. The current transformer 32 monitors the grid current in real time and transmits the signal to the control system to ensure compensation accuracy. The capacitor 33 stores and releases charge, providing capacitive reactive power to the grid to compensate for reactive power consumed by inductive loads, thereby improving the power factor. The inductor is connected in series or parallel with the capacitor 33 to suppress harmonic currents, limit inrush current, and adjust the resonant point of the compensation device.

[0041] The switch assembly 20 is mainly used to ensure that the reactive power compensation component 30 is completely isolated from the power grid when it needs to be inspected or maintained, thus avoiding the risk of electric shock to operators. For example, it prevents the safety hazards caused by the sudden energization of the upstream power supply. The switch assembly 20 includes a disconnect switch 21 and a first operating lever 22. The disconnect switch 21 is installed inside the cabinet 10, with one end connected to the other end of the power inlet copper busbar 110 and the other end connected to the vacuum contactor 31. One end of the first operating lever 22 is connected to the disconnect switch 21, and the other end is used to perform driving operations, so as to switch the disconnect switch 21 between the on and off states through the operating lever.

[0042] Thus, when the reactive power compensation component 30 needs to be connected, the operator uses the first operating lever 22 to put the disconnecting switch 21 into the conducting state. At this time, the current from the power supply flows into the disconnecting switch 21 through the power inlet copper busbar 110, and then into the vacuum contactor 31. After receiving the control signal, the vacuum contactor 31 closes, and the current flows through the current transformer 32, capacitor 33, and reactor 34 to complete the reactive power compensation to the power grid. When it is necessary to stop the operation of the reactive power compensation component 30, the operator uses the first operating lever 22 to switch the disconnecting switch 21 to the open state. In this way, the electrical connection between the reactive power compensation component 30 and the power supply is cut off, and the current cannot continue to flow, realizing the switching control of the reactive power compensation component 30.

[0043] In summary, the technical solution of this application, through the setting of the switch assembly 20, allows the disconnect switch 21 to be disconnected by the first operating lever 22 when the reactive power compensation assembly 30 needs to be inspected or maintained, thereby completely isolating the reactive power compensation assembly 30 from the power supply and avoiding the risk of electric shock to the operator.

[0044] See Figure 2 As shown, in some embodiments, the disconnect switch 21 includes a mounting base 211, a first contact head 212 and a second contact head 213, and a first contact piece 214. The first contact head 212 and the second contact head 213 are spaced apart on the mounting base 211. The first contact head 212 is connected to the power busbar 110, and the second contact head 213 is connected to the vacuum contactor 31. One end of the first contact piece 214 is rotatably connected to the second contact head 213, and a transmission mechanism 215 is provided in its middle, connected to a first operating lever 22. Driven by the first operating lever 22, the transmission mechanism 215 drives the first contact piece 214 to rotate, causing the other end of the first contact piece 214 to overlap with the first contact head 212, or releasing the overlap between the first contact piece 214 and the first contact head 212.

[0045] In this embodiment, a specific structural design for the switch assembly 20 is proposed. The first contact head 212 and the second contact head 213 are spaced apart on the mounting base 211, ensuring sufficient space between them to facilitate the rotation and operation of the first contact piece 214. The first contact head 212 is connected to the power busbar 110, responsible for introducing the power supply current; the second contact head 213 is connected to the vacuum contactor 31, transmitting the current to the vacuum contactor 31, and then flowing into other parts of the reactive power compensation assembly 30. Furthermore, one end of the first contact piece 214 is rotatably connected to the second contact head 213, allowing the first contact piece 214 to rotate around the connection point. The transmission mechanism 215 in the middle can drive the first operating lever 22 to convert it into the rotational motion of the first contact piece 214.

[0046] Thus, driven by the first operating lever 22, the transmission mechanism 215 drives the first contact piece 214 to rotate, causing the other end of the first contact piece 214 to engage with the first contact head 212, thereby establishing circuit continuity. When it is necessary to disconnect the circuit, the first operating lever 22 reverses its direction, causing the first contact piece 214 to rotate and disengage from the first contact head 212, thus disconnecting the circuit. Furthermore, in a further technical solution, the first operating lever 22 can be operated under the control of an operator or an automated control system to drive the rotation of the first contact piece 214, thereby achieving circuit continuity control.

[0047] See Figure 2 As shown, in some embodiments, the transmission mechanism 215 includes a first rotating shaft, a first transmission rod, and a second transmission rod. The first rotating shaft is hinged to one end of the first operating lever 22 to rotate under the drive of the first operating lever 22; one end of the first transmission rod is fixedly connected to the first rotating shaft to rotate with the first rotating shaft; one end of the second transmission rod is hinged to the first transmission rod, and the other end is hinged to the middle of the contact piece.

[0048] In this embodiment, a structural configuration of the transmission mechanism 215 is proposed. The first rotating shaft serves as the power input end of the entire transmission mechanism 215 and is hinged to one end of the first operating lever 22, allowing the first operating lever 22 to swing freely within a certain range. At the same time, the swinging motion is transmitted to the first rotating shaft, driving the first transmission rod and the second transmission rod connected to it to move and drive the first contact piece 214 to rotate around its connection point with the second contact head 213.

[0049] When the operator or the automated control system drives the first operating lever 22, the first operating lever 22 swings around its hinge point with the mounting base 211. Since the first operating lever 22 is hinged to the first rotating shaft, the swinging motion is transmitted to the first rotating shaft, causing it to rotate around its own axis. Furthermore, the rotation of the first rotating shaft drives the first transmission rod to rotate synchronously, and the rotation of the first transmission rod further drives the second transmission rod. One end of the second transmission rod performs a circular motion, while the other end pushes the contact piece around its connection point with the second contact head 213 through the hinge point. When the first operating lever 22 swings to a certain position, the contact piece engages with the first contact head 212, achieving circuit continuity; when the first operating lever 22 swings in the opposite direction, the contact piece separates from the first contact head 212, and the circuit is broken.

[0050] See Figure 2 As shown, in some embodiments, the switch assembly 20 further includes a second operating lever 24 and a grounding switch 23. The grounding switch 23 further includes a second rotating shaft 231 and a second contact piece 232 connected to the second rotating shaft 231. The second rotating shaft 231 is hinged to one end of the second operating lever 24 to rotate under the drive of the second operating lever 24, and to make the other end of the second contact piece 232 overlap the second contact head 213, or to release the overlap relationship between the second contact piece 232 and the second contact head 213; wherein, the second contact piece 232 is grounded.

[0051] Therefore, the operation process of the switch assembly 20 in this application includes: during normal operation, the upstream switch is closed (the connected power grid switch), and the isolating switch 21 remains in the disconnected state to ensure stable circuit operation. When maintenance is required, the upstream switch is first disconnected, then the isolating switch 21 is operated to disconnect, and finally the grounding switch 23 is operated to close. After maintenance is completed, the grounding switch 23 is operated to open, the isolating switch 21 is operated, and finally the upstream switch is closed to restore normal circuit operation.

[0052] Understandably, residual charge may remain after the circuit is disconnected. This charge may cause electric shock during maintenance. By setting up the grounding switch 23, a discharge channel can be provided to quickly release the residual charge into the ground, reducing the risk of electric shock and providing a safe working environment for maintenance personnel.

[0053] Furthermore, the mounting base 211 includes a first horizontal plate, a second horizontal plate, and a third horizontal plate spaced apart vertically. The spaces between the first and second horizontal plates, and between the second and third horizontal plates, are designed with openwork, which not only reduces the weight of the mounting base 211 but also enhances its heat dissipation performance, helping to lower the temperature of the switch assembly 20 during operation. Specifically, a first contact head 212 is disposed on the first horizontal plate, a second contact head 213 is disposed on the second horizontal plate, a first rotating shaft is disposed corresponding to the openwork area between the first and second horizontal plates, and a second rotating shaft 231 is disposed corresponding to the openwork area between the second and third horizontal plates. This openwork design allows for the movement of the transmission rod mounted on the rotating shaft, enabling the rotating shaft to rotate smoothly.

[0054] See Figure 1 and Figure 3 As shown, in some embodiments, a plurality of mounting beams 120 are arranged longitudinally and transversely inside the cabinet 10, and the switch assembly 20 and the reactive power compensation assembly 30 are disposed on the mounting beams 120 so that the switch assembly 20 and the reactive power compensation assembly 30 are arranged vertically inside the cabinet 10.

[0055] In this embodiment, the longitudinally and transversely arranged mounting beams 120 form a regular grid structure, providing a precise installation positioning reference for the switch assembly 20 and the reactive power compensation assembly 30. This further allows the components to be arranged vertically, making full use of the vertical space of the cabinet 10, saving floor space, and improving space utilization.

[0056] Furthermore, the power busbar 110 and the switch assembly 20 are positioned near the top of the cabinet 10, while the power cable enters from the bottom of the cabinet 10. The bottom of the cabinet 10 has a cable inlet hole, and a tower-shaped sealing ring 130 is provided corresponding to the inlet hole. When the power cable passes through the inlet hole, the sealing ring tightly wraps around the cable, forming an effective seal. A cable clamp 140 is also provided between the bottom and top of the cabinet 10 to hold the power cable, firmly fixing it inside the cabinet 10 and preventing it from loosening or falling off during operation due to vibration, pulling, or other reasons.

[0057] Furthermore, when the power busbar 110 and switch assembly 20 are located near the top of the cabinet 10, the power cable can also be accessed from the side of the cabinet 10. The side of the cabinet 10 has a perforated section, and an insulator 150 is installed at the top of the cabinet 10. The power cable is accessed from the side of the cabinet 10 through the insulator 150 and further connected to the power busbar. This side-access method can accommodate the needs of parallel cabinet wiring, reduce wiring complexity, and improve the adaptability of the cabinet 10.

[0058] See Figure 1As shown, in some embodiments, the reactive power compensation component 30 further includes a discharge coil 35, which is connected in parallel to the capacitor 33. Utilizing its own inductive characteristics to form a resonant circuit with the capacitance of the capacitor 33, the residual charge within the capacitor 33 can be quickly released, further preventing electric shock injuries to maintenance personnel and avoiding potential impact on the normal operation of subsequent equipment.

[0059] See Figure 3 As shown, in some embodiments, a surge arrester 160 is also installed inside the cabinet 10. The surge arrester 160 is used to protect the reactive power compensation component 30 from damage caused by lightning overvoltage and switching overvoltage. When a lightning strike or switching overvoltage occurs in the power grid, the surge arrester 160 can act quickly to limit the overvoltage to a safe level.

[0060] The above are only some or preferred embodiments of this application. Neither the text nor the drawings should limit the scope of protection of this application. All equivalent structural transformations made using the content of this application's specification and drawings under the overall concept of this application, or direct / indirect applications in other related technical fields, are included within the scope of protection of this application.

Claims

1. A high efficiency reactive power compensation device, characterized by, The utility model relates to a cabinet body, which is provided with an incoming copper bar inside, one end of the incoming copper bar is connected with an incoming cable, a switch assembly, which comprises an isolating switch and a first operating rod, the isolating switch is arranged in the cabinet body, one end of the first operating rod is connected with the isolating switch, and the other end is used for performing driving operation to drive the isolating switch to switch between the on state and the off state through the first operating rod, a reactive power compensation assembly, which is arranged in the cabinet body and comprises a vacuum contactor, a current transformer, a capacitor and a reactor connected in sequence, wherein one end of the isolating switch is connected with the other end of the incoming copper bar, and the other end is connected with the vacuum contactor, so that when the isolating switch is in the on state, the electrical connection between the incoming copper bar and the reactive power compensation assembly is turned on, and when the isolating switch is in the off state, the electrical connection between the incoming copper bar and the reactive power compensation assembly is cut off. The isolating switch comprises a mounting seat, first and second contact heads arranged on the mounting seat, a first contact piece rotatably connected to the second contact head, and a transmission mechanism arranged in the middle of the first contact piece and connected to the first operating rod, so that under the driving of the first operating rod, the first contact piece is driven to rotate through the transmission mechanism, and the other end of the first contact piece is overlapped on the first contact head or the overlapping relationship between the first contact piece and the first contact head is released. The transmission mechanism comprises a first rotating shaft hinged to one end of the first operating rod, a first transmission rod fixedly connected to the first rotating shaft to rotate with the first rotating shaft, and a second transmission rod hinged to one end of the first transmission rod and the middle of the contact piece. The switch assembly further comprises a second operating rod and a grounding switch, the grounding switch comprises a second rotating shaft arranged on the mounting seat and a second contact piece connected to the second rotating shaft, the second rotating shaft is hinged to one end of the second operating rod to rotate under the driving of the second operating rod, and the other end of the second contact piece is overlapped on the second contact head or the overlapping relationship between the second contact piece and the second contact head is released. The mounting seat comprises first, second and third horizontal plates arranged in the vertical direction, the first and second horizontal plates and the second and third horizontal plates are designed to be hollow, the first contact head is arranged on the first horizontal plate, the second contact head is arranged on the second horizontal plate, the first rotating shaft is arranged corresponding to the hollow area between the first and second horizontal plates, and the second rotating shaft is arranged corresponding to the hollow area between the second and third horizontal plates.

2. The high efficiency reactive compensation device of claim 1, wherein, ​ ​ ​ ​ 3. The device, as recited in claim 2, characterized in that, ​ ​ ​ ​ 4. The high performance reactive compensation device of claim 3, wherein, ​ ​ 5. The device, as claimed in claim 4, wherein ​ ​ 6. The device, as claimed in claim 1, wherein The cabinet is provided with several installation beams in longitudinal and transverse directions, and the switch assembly and the reactive compensation assembly are arranged on the installation beams, so that the switch assembly and the reactive compensation assembly are arranged in vertical direction in the cabinet.

7. The device, as recited in claim 6, characterized in that, The incoming copper bar and the switch assembly are arranged close to the top of the cabinet, and the incoming cable is connected from the bottom of the cabinet. The bottom of the cabinet is provided with a wire inlet hole, and a tower type sealing ring is arranged corresponding to the wire inlet hole for sealing, and a cable clamp is arranged between the bottom and the top of the cabinet to clamp the incoming cable.

8. The high performance reactive compensation device of claim 7, wherein, The incoming copper bar and the switch assembly are arranged close to the top of the cabinet, and the incoming cable is connected from the side of the cabinet. The side of the cabinet is hollowed out, and an insulator is arranged at the top of the cabinet, the incoming cable is connected to the insulator from the side of the cabinet, and is further connected to the incoming copper bar.

9. The device, as claimed in claim 1, wherein said device is a high efficiency static compensator. The reactive compensation assembly further comprises a discharge coil connected in parallel to the capacitor.

10. The device, as claimed in claim 1, wherein said device is a high efficiency static compensator. The cabinet is further provided with a lightning arrester for protecting the reactive compensation assembly from lightning overvoltage and operating overvoltage.

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