A closing inrush current suppression device for reactive power compensation

Abstract

The present invention relates to a closing surge suppression device for reactive compensation in the field of reactive compensation in distribution networks. The device is installed on the incoming line side of a capacitor group for reactive compensation, and includes a voltage transformer, a current sensor, a circuit breaker, a fast switch, a phase control device, and a controller. When the capacitor group needs to be put into operation, the capacitor group can be put into operation by first closing the circuit breaker, so that the surge generated when closing the circuit breaker is first suppressed by the phase control device; then the fast switch is closed to exit the phase control device, and the capacitor group remains in operation. In the case of presetting multiple protection branches, each protection branch is connected to a control device respectively, and the control device can realize automatic control by using the size of the closing surge current, so that a corresponding number of protection branches can be put into operation as needed in the process of eliminating the surge peak.

Description

Technical Field

[0001] The invention relates to the field of reactive power compensation for distribution networks, and in particular to a closing inrush current suppression device for reactive power compensation. Background Art

[0002] In order to ensure the power supply reliability and quality of the distribution network system, capacitor banks are usually connected in parallel in the distribution network system to solve the problem.

[0003] In the above-mentioned measures, the capacitor bank used for reactive power compensation of the distribution network system will generate a large closing surge current at the moment of commissioning, which will impact the capacitor bank. In addition, the larger the capacity of the capacitor bank, the greater the surge current generated when the vacuum circuit breaker is closed to commission the capacitor bank.

[0004] Generally, the duration of the closing inrush current is only a few milliseconds. However, for a switch with a slow closing speed, a breakdown arc will be generated, causing the closing inrush current to rise sharply, and the peak value of the closing inrush current will increase sharply, causing an impact on the capacitor bank and causing damage to the capacitor bank.

[0005] Therefore, in the inrush current management of capacitor combination gates for reactive power compensation in distribution network systems, the following problems are inevitable:

[0006] 1. When the capacitor bank is put into operation, the closing surge current will impact the capacitor bank due to the capacity of the capacitor bank;

[0007] 2. When the capacitor bank is put into operation, the closing speed of the circuit breaker will cause the peak value of the closing inrush current to increase sharply, increasing the impact on the capacitor bank;

[0008] 3. When the capacity of the capacitor bank is expanded, putting the capacitor bank into operation again after the expansion will cause an increase in the closing inrush current and increase the impact on the capacitor bank. Summary of the invention

[0009] In order to solve the problem that when a capacitor bank is put into operation, due to the influence of the capacitor's own capacity, the capacity after expansion and the closing speed of the circuit breaker, a closing surge current appears in the line where the capacitor bank is located and the capacitor bank is impacted, thereby causing damage to the capacitor bank, the present invention provides the following technical solutions:

[0010] A closing inrush current suppression device for reactive power compensation is installed on the incoming line side of a capacitor bank for reactive power compensation, and comprises a voltage transformer, a current sensor, a circuit breaker, a fast switch, a phase control device and a controller.

[0011] The voltage transformer is connected between the lines of phase B and phase C to collect the voltage signal at the location. The current sensor is installed on the lines of phase A, phase B and phase C to collect the current signal at the location. The circuit breaker is connected to the lines of phase A, phase B and phase C, and the fast switch is connected to the lines of phase A and phase C. The circuit breaker and the fast switch cooperate to switch the switching state of the capacitor group through closing and opening. The phase control device is connected in parallel to the fast switch to suppress the closing inrush current when the capacitor group is put into operation. The controller is used to receive, analyze and process voltage signals and current signals to control the circuit breaker and the fast switch to perform corresponding closing and opening actions.

[0012] Furthermore, the circuit breaker is a three-phase circuit breaker, and the vacuum interrupter chambers of the three phases of the circuit breaker can perform closing and opening actions synchronously.

[0013] Furthermore, the fast switch is an eddy current driven circuit breaker, and the fast switch on each phase can perform closing and opening actions independently.

[0014] Furthermore, the phase control device comprises a current suppression branch and a protection branch, and the current suppression branch and the protection branch are connected in parallel.

[0015] Furthermore, the current suppression branch is formed by a plurality of diodes connected in series in the same direction to suppress the closing surge current generated when the capacitor bank is put into operation, and there is at least one current suppression branch.

[0016] Furthermore, the protection branch is composed of a nonlinear MOV resistor to eliminate the inrush current peak value of the current suppression branch.

[0017] Furthermore, there is one protection branch.

[0018] Furthermore, there are more than two protection branches.

[0019] Furthermore, the phase control device also includes a control device to mobilize each protection branch to participate in eliminating the surge peak, and the control device includes a fixed component and a moving component. The fixed component includes a contact piece embedded in the row and its row body, and the contact piece is connected to the protection branch one by one. The moving component includes a contact strip that can contact each contact piece, a push rod that drives the contact strip to move, and an eddy current disk and a coil disk that drive the push rod to move.

[0020] In a further embodiment, one side of the contact piece is used to contact the contact strip, and the side is exposed to the outer surface of the connection row. The other side of the contact piece is connected to the nonlinear MOV resistor in the corresponding protection branch through a wire.

[0021] In a further improvement, the contact strip is installed on the side wall of one end of the push rod, and one side of the contact strip is used to contact the contact piece and the other side is connected to the outgoing line side of the coil disk through a wire. The eddy current disk is a coil, and a through hole is provided in the middle of the disk body for the push rod to pass through when the push rod is displaced. The coil disk is a coil, and its disk body is fixed on the push rod body, and its incoming line end is connected to the incoming line side of the current suppression branch through a wire.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. When the capacitor bank needs to be put into operation, the capacitor bank can be put into operation by closing the circuit breaker first, so that the inrush current generated when closing the circuit breaker is first suppressed by the phase control device; then close the fast switch to exit the phase control device and keep the capacitor bank in operation.

[0024] 2. When the capacity of the capacitor bank needs to be expanded, a new protection branch can be added in advance. By investing more nonlinear MOV resistors in the operation of suppressing the closing inrush current, the effect of eliminating the inrush current peak can be increased, thereby protecting the capacitor bank.

[0025] 3. When multiple protection branches are preset, each protection branch is connected to a control device respectively, and the control device can be used to realize automatic control using the size of the closing surge current, so that a corresponding number of protection branches can be put into use as needed in the process of eliminating the surge current peak.

[0026] 4. In the operation of suppressing the closing surge current, the various protection branches are connected in parallel to play a shunting role, and achieve the purpose of suppressing the overvoltage of the current suppression branch, and also achieve the purpose of suppressing the overvoltage when the fast switch is closed and opened.

[0027] 5. The coil disk used as a driver in the control device obtains driving energy by using surge current to establish a magnetic field, and cooperates with the induced magnetic field of the eddy current disk to achieve driving, thereby controlling the number of protection branches put into operation. No additional power supply is required, which not only achieves the purpose of energy saving and environmental protection, but also reduces the cost and space occupied by the control device by abandoning the power supply equipment hardware. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a wiring diagram of the closing inrush current suppression device of the present invention;

[0029] Figure 2 It is a front view of the closing inrush current suppression device of the present invention;

[0030] Figure 3 It is a side view inside the cabinet of the closing inrush current suppression device of the present invention;

[0031] Figure 4 The topological diagram of the phase control device of the present invention with a single protection branch in parallel;

[0032] Figure 5 The topological diagram of the phase control device of the present invention for connecting multiple protection branches in parallel;

[0033] Figure 6 For the present invention Figure 5 Enlarged view of point a.

[0034] In the accompanying drawings, the names of the components represented by the reference numerals are listed as follows:

[0035] 01-current sensor, 02-circuit breaker, 03-fast switch, 04-phase control device;

[0036] 001-connecting row, 002-contact piece, 003-push rod, 004-contact strip, 005-eddy current disk, 006-coil disk, 007-stop piece. DETAILED DESCRIPTION

[0037] The preferred specific embodiments for implementing the present invention are described in detail below, and a clear and complete description is made in conjunction with the accompanying drawings.

[0038] See also Figure 1-Figure 3 The present invention provides a closing inrush current suppression device for reactive power compensation. The device is installed on the incoming line side of the capacitor bank used for reactive power compensation in the distribution network system to control the switching of the capacitor bank and suppress the closing inrush current and overvoltage during the switching process. The device includes a voltage transformer, a current sensor 01, a circuit breaker 02, a fast switch 03, a phase control device 04 and a controller. Figure 1 In the electrical wiring diagram, A, B and C represent the A-phase line, B-phase line and C-phase line in the distribution network system respectively; PT represents the voltage transformer; K represents the circuit breaker 02; Ka and Kc both represent the fast switch 03; Da and Dc both represent the phase control device 04; CTa, CTb and CTc all represent the current sensor 01; Cz represents the capacitor bank.

[0039] Specifically:

[0040] The voltage transformer is connected between the B-phase and C-phase lines to collect the voltage signal at the location of the voltage transformer, such as collecting the line voltage between the B-phase and the C-phase. The voltage transformer needs to be set on the incoming line side of the circuit breaker 02 to prevent the closing and opening actions of the circuit breaker 02 from affecting the voltage transformer's collection of voltage signals. In addition, the voltage transformer can be set inside the equipment cabinet; it can also be set outside the equipment cabinet.

[0041] The current sensor 01 is installed on the A-phase, B-phase and C-phase lines to collect the current signal at the location of the current sensor 01, such as collecting the current value of each line on the three-phase line. The current sensor 01 of the A-phase, B-phase and C-phase lines can be set on any section of the line in the equipment cabinet; it can also be set outside the equipment cabinet, but it needs to be on the incoming line side of the capacitor bank.

[0042] The circuit breaker 02 is connected to the lines of phase A, phase B and phase C, and is used to control the on / off state of the circuit where it is located. The circuit breaker 02 can be set in the equipment cabinet; it can also be set outside the equipment cabinet.

[0043] The fast switch 03 is connected to the A-phase and C-phase lines to control the on / off state of the circuit at its location and cooperate with the circuit breaker 02 to realize the purpose of putting the capacitor bank into operation or withdrawing the capacitor bank from the distribution network system. The fast switch 03 is located on the outgoing line side of the circuit breaker 02. In addition, the fast switch 03 can be set in the equipment cabinet; it can also be set outside the equipment cabinet.

[0044] The phase control device 04 is connected in parallel with the fast switch 03, and is used to suppress the closing inrush current and overvoltage during the switching process of the capacitor bank. The phase control device 04 includes a current suppression branch and a protection branch, and the current suppression branch and the protection branch are connected in parallel. The current suppression branch is used to suppress the closing inrush current during the switching process of the capacitor bank, and the protection branch is used to eliminate the inrush current peak value of the current suppression branch when suppressing the closing inrush current. In addition, the phase control device 04 can be set in the equipment cabinet; it can also be set outside the equipment cabinet instead.

[0045] The controller is used to receive, analyze, process and record the voltage signal collected by the voltage transformer and the current signal collected by the current sensor, and issue the closing and opening commands of the circuit breaker 02 and the fast switch 03, so that the circuit breaker 02 and the fast switch 03 perform corresponding closing and opening actions.

[0046] Preferably:

[0047] Circuit breaker 02 is a three-phase circuit breaker. The vacuum interrupters of the three phases of vacuum circuit breaker 02 can perform closing and opening actions synchronously. That is, when the controller commands vacuum circuit breaker 02 to perform closing and opening actions, the circuits of phases A, B and C are all turned on and off by the closing and opening actions of the three corresponding vacuum interrupters in the vacuum circuit breaker 02, and the three vacuum interrupters can perform closing and opening actions synchronously, so that the circuits of phases A, B and C are turned on or off at the same time.

[0048] Preferably:

[0049] The fast switch 03 is an eddy current driven circuit breaker, and each fast switch 03 can perform a closing and opening action independently. In this way, each fast switch 03 can be commanded to perform a closing and opening action separately through a controller.

[0050] Preferably:

[0051] In the same phase control device 04, the current suppression branch is formed by connecting a plurality of diodes in series in the same direction to suppress the closing inrush current generated during the switching process of the capacitor bank. Among them, the number of diodes in the current suppression branch is at least one. In addition, there is at least one current suppression branch; and when there are more than two current suppression branches (including two), each current suppression branch is connected in parallel.

[0052] In the same phase control device 04, the protection branch is composed of nonlinear MOV resistors to eliminate the inrush current peak of the current suppression branch. There is at least one protection branch; when there are more than two protection branches (including two), each protection branch is connected in parallel.

[0053] More preferably:

[0054] The forward current direction of each diode in the current suppression branch is opposite to the current direction of the fast switch 03 connected in parallel therewith.

[0055] The nonlinear MOV resistor in the protection branch is composed of several stacked zinc oxide valve sheets. Embodiment 1

[0056] See also Figure 4 This embodiment provides a specific implementation of the phase control device 04. Herein, the phase control device 04 has one suppression branch and one protection branch.

[0057] In this embodiment:

[0058] When the capacitor bank needs to be put into operation to compensate for reactive power in the distribution network system, the controller commands the circuit breaker 02 to close the circuit. At this time, the current of the distribution network system flows into the capacitor bank through the circuit breaker 02 and the phase control device 04.

[0059] During this period, the surge current generated when the circuit breaker 02 is closed will first flow through the current suppression branch of the phase control device 04, and the current flow direction is opposite to the positive pole of the diode of the current suppression branch. That is, the surge current will be suppressed, so that the current flowing into the capacitor bank is small, thereby avoiding the impact of the surge current on the capacitor bank, and can also play the effect of pre-magnetizing the capacitor bank. In addition, if the voltage of the current suppression branch rises to the voltage threshold of the nonlinear MOV resistor in the protection branch, the nonlinear MOV resistor changes from a high resistance state to a low resistance state, so that the protection branch is quickly turned on, so that a large current surges to the protection branch, and the inrush current is converted into heat, thereby achieving the effect of consuming the surge current for suppression, and preventing the diode of the current suppression branch from being broken down due to excessive surge current. In addition, since the charge accumulated in the current suppression branch is introduced into the protection branch for consumption, the original accumulated charge of the current suppression branch decreases, that is, the voltage at both ends of the current suppression branch decreases, thereby suppressing the surge current while suppressing the overvoltage, and preventing the voltage from being too large and penetrating the diode of the current suppression branch.

[0060] After the circuit breaker 02 completes the closing action, and the phase-controlled device 04 suppresses the closing surge current and overvoltage, the controller commands the fast switch 03 to perform the closing action. At this time, after the fast switch 03 completes the closing action, the phase-controlled device 04 connected in parallel therewith is automatically short-circuited. That is, since the resistance of the fast switch 03 is much smaller than that of the phase-controlled device 04, the current basically passes through the fast switch 03, which is equivalent to the fast switch 03 short-circuiting the phase-controlled device 04. In this way, the phase-controlled device 04 no longer participates in the operation of the distribution network system, and thus no longer increases the burden on the distribution network system. In addition, since the capacitor bank is pre-magnetized before the fast switch 03 is closed, the voltage difference of the capacitor bank itself is reduced, which is conducive to reducing the degree of surge current. Embodiment 2

[0061] See also Figure 5 and Figure 6 This embodiment provides a specific implementation of the phase control device 04. Herein, the phase control device 04 has one suppression branch and two or more protection branches (including two). In addition, in addition to the suppression branch and the protection branch, the phase control device 04 also includes a control device for mobilizing each protection branch to participate in eliminating the surge peak, that is, automatically putting the corresponding number of protection branches into operation according to the demand to participate in eliminating the surge peak. The control device includes a fixed component and a dynamic component.

[0062] The fixed component includes a connection row 001 and a plurality of contacts 002 embedded in the connection row body, and the contacts 002 are connected to the protection branches one by one. That is, each protection branch is only connected to one contact 002, and each contact 002 is also only connected to one protection branch. Among them, the connection row 001 is an insulator; one side of the contact 002 is used to contact the contact strip 004, and the side is exposed to the outer surface of the connection row 001, and the other side of the contact 002 is connected to the nonlinear MOV resistor in the corresponding protection branch through a wire.

[0063] The moving assembly includes a contact strip 004 that can contact each contact piece 002 , a push rod 003 that drives the contact strip 004 to move, and an eddy current disk 005 and a coil disk 006 that drive the push rod 003 to move.

[0064] Preferably:

[0065] The contact strip 004 is fixedly mounted on the side wall at one end of the push rod 003, and one side of the contact strip 004 can be slidably connected to each contact piece 002, while the other side of the contact strip 004 is connected to the outgoing line side of the coil disk 006 through a wire. That is, the contact strip 004 can contact with different numbers of contact pieces 002 by sliding adjustment.

[0066] Preferably:

[0067] The eddy current disk 005 is a coil, and a through hole is provided in the middle of the disk body for the push rod 003 to pass through when the push rod 003 is displaced. Among them, the eddy current disk 005 is fixedly arranged, that is, the eddy current disk 005 does not move during the working process.

[0068] Preferably:

[0069] The coil disk 006 is a coil, and its disk body is fixed on the rod body of the push rod 003. That is, the coil disk 006 will drive the push rod 003 to move together during operation. Among them, the incoming line end of the coil disk is connected to the incoming line side of the current suppression branch through a wire. In addition, the magnetic field established by the coil disk 006 after receiving electricity repels the magnetic field induced by the eddy current disk 005.

[0070] In this embodiment:

[0071] When the capacitor bank needs to be put into operation to compensate for reactive power in the distribution network system, the controller commands the circuit breaker 02 to close the circuit. At this time, the current of the distribution network system flows into the capacitor bank through the circuit breaker 02 and the phase control device 04.

[0072] During this period, the inrush current generated when the circuit breaker 02 is closed will first flow through the current suppression branch of the phase control device 04, and the current flow direction is opposite to the positive pole of the diode of the current suppression branch. That is, the inrush current will be suppressed, so that the current flowing into the capacitor bank is small, thereby avoiding the impact of the inrush current on the capacitor bank, and also having the effect of pre-magnetizing the capacitor bank.

[0073] At the beginning, only one protection branch is connected in parallel to the current suppression branch, and the coil disk 006 is in contact with the eddy current disk 005. That is, the contact strip 004 is in contact with only one contact piece 002 at this time, and the protection branch connected to the contact piece 002 is connected in parallel to the current suppression branch. If the voltage of the current suppression branch rises to the voltage threshold of the nonlinear MOV resistor in the protection branch, the nonlinear MOV resistor changes from a high resistance state to a low resistance state, so that the protection branch is quickly turned on, so that a large current flows into the protection branch, and the flowing current is converted into heat, thereby achieving the effect of consuming the surge current for suppression, and preventing the diode of the current suppression branch from being broken down due to excessive surge current. Since the charge accumulated in the current suppression branch is introduced into the protection branch for consumption, the original accumulated charge of the current suppression branch decreases, that is, the voltage at both ends of the current suppression branch decreases, thereby suppressing the surge current while suppressing the overvoltage, and preventing the diode of the current suppression branch from being broken down due to excessive voltage.

[0074] Subsequently, if the inrush current generated during operation is extremely large, a large amount of charge is accumulated on the incoming line side of the current suppression branch, and exceeds the nonlinear MOV resistance threshold of a protection branch, the larger the inrush current, the larger the current flowing through the coil disk 006, the stronger the magnetic field established by the coil disk 006, and the larger the current generated in the coil of the eddy current disk 005 by inducing the magnetic field of the coil disk 006, and the stronger the induced magnetic field established by the eddy current disk 005. In this way, the stronger the repulsive force between the coil disk 006 and the eddy current disk 005, the longer the distance that the push rod 003 drives the contact strip 004 to move, the more contact pieces 002 that the contact strip 004 contacts, and the more protection branches participate in eliminating the inrush current peak. That is, the larger the inrush current and overvoltage, the more protection branches are put into operation, the better the shunting effect, the stronger the effect on current suppression, and the faster the voltage at both ends of the current suppression branch can be reduced.

[0075] Finally, after the circuit breaker 02 completes the closing action and the phase-controlled device 04 suppresses the closing surge current and overvoltage, the controller commands the fast switch 03 to perform the closing action. At this time, after the fast switch 03 completes the closing action, the phase-controlled device 04 connected in parallel therewith is automatically short-circuited. That is, since the resistance of the fast switch 03 is much smaller than that of the phase-controlled device 04, the current basically passes through the fast switch 03, which is equivalent to the fast switch 03 short-circuiting the phase-controlled device 04. In this way, the phase-controlled device 04 no longer participates in the operation of the distribution network system, and thus no longer increases the burden on the distribution network system. In addition, since the capacitor bank is pre-magnetized before the fast switch 03 is closed, the voltage difference of the capacitor bank itself is reduced, which is conducive to reducing the degree of surge current.

[0076] In this embodiment:

[0077] The contact piece 002 installation position on the connecting row can be designed redundantly, and the stroke of the coil disk 006 can also be easily designed. In this way, if the capacitor bank is expanded, new contacts can be embedded in the redundant installation positions according to the needs, and new protection branches can be connected to the new contacts 002. In this way, the total number of protection branches is increased, the effect of eliminating the inrush current peak is enhanced, and the capacitor bank can continue to be protected.

[0078] In this embodiment:

[0079] Since the coil disk 006 obtains energy by directly using the surge current generated in the distribution network system, and the eddy current disk 005 obtains energy by directly using electromagnetic induction to obtain energy from the magnetic field created by the coil disk 006, there is no need for additional power supply, which not only achieves the purpose of energy saving and environmental protection, but also reduces the cost and space occupied by the control device by abandoning the power supply equipment hardware.

[0080] In this embodiment:

[0081] A stopper 007 for limiting the maximum travel of the push rod 003 may be provided in the travel path of the push rod 003. In addition, the design of the push rod 003 is made to move along a predetermined track with reference to a general linear displacement method, such as a straight rail for limiting, a straight cylinder for limiting or a straight rod for limiting. Embodiment 3

[0082] Based on the first or second embodiment, this embodiment provides a technical solution when the capacitor bank exits the distribution network system.

[0083] In this embodiment:

[0084] When the capacitor bank used for reactive power compensation needs to be withdrawn from the distribution network system, the controller first commands the fast switch 03 to perform the opening action. After the fast switch 03 completes the opening action, it will enter the preset waiting time, which can be set as needed. After the waiting time is over, the controller commands the circuit breaker 02 to perform the opening action. After the circuit breaker 02 completes the opening action, the capacitor bank withdraws from the distribution network system.

[0085] Based on the above content and the accompanying drawings, those skilled in the art can understand and implement the present invention. In addition, any non-creative modifications made to the present invention by those skilled in the art without creative work still fall within the protection scope of the present invention.

Claims

1. A closing inrush current suppression device for reactive power compensation, which is installed on the incoming line side of a capacitor bank for reactive power compensation, characterized in that: The device comprises a voltage transformer, a current sensor (01), a circuit breaker (02), a fast switch (03), a phase control device (04) and a controller: The voltage transformer is connected between the B-phase and C-phase lines to collect the voltage signal at the location; The current sensor (01) is installed on the lines of phase A, phase B and phase C to collect current signals at the locations; The circuit breaker (02) is connected to the lines of phases A, B and C, and the fast switch (03) is connected to the lines of phases A and C. The circuit breaker (02) and the fast switch (03) cooperate to switch the switching state of the capacitor bank through closing and opening. The phase control device (04) is connected in parallel to the fast switch (03) to suppress the closing surge current when the capacitor bank is put into operation, and includes more than two protection branches, contact pieces (002) connected to the protection branches in a one-to-one correspondence, contact strips (004) capable of contacting each contact piece (002), eddy current disks (005) and coil disks (006), and the eddy current disks (005) and the coil disks (006) adjust the number of contact pieces (002) contacted by the contact strips (004) according to the size of the surge current to mobilize each protection branch to participate in eliminating the surge current peak state; The controller is used to receive, analyze and process voltage signals and current signals to control the circuit breaker (02) and the fast switch (03) to perform corresponding closing and opening actions.

2. The closing inrush current suppression device for reactive power compensation according to claim 1 is characterized in that: The circuit breaker (02) is a three-phase circuit breaker, and the three-phase vacuum interrupter chambers of the circuit breaker (02) are capable of synchronously performing closing and opening actions.

3. The closing inrush current suppression device for reactive power compensation according to claim 1 is characterized in that: The fast switch (03) is an eddy current driven circuit breaker, and the fast switch (03) on each phase can perform closing and opening actions independently.

4. The closing inrush current suppression device for reactive power compensation according to claim 1, characterized in that: The phase control device (04) further comprises a current suppression branch: The current suppression branch and the protection branch are connected in parallel.

5. The closing inrush current suppression device for reactive power compensation according to claim 4 is characterized in that: The current suppression branch is formed by a plurality of diodes connected in series in the same direction, and is used to suppress the closing inrush current generated when the capacitor bank is put into operation; There is at least one flow suppression branch.

6. The closing inrush current suppression device for reactive power compensation according to claim 4 or 5, characterized in that: The protection branch is composed of a nonlinear MOV resistor to eliminate the surge current peak of the current suppression branch.

7. The closing inrush current suppression device for reactive power compensation according to claim 6, characterized in that: The phase control device (04) further comprises a fixed component and a moving component: The fixed component includes a connecting row (001), and the contact piece (002) is also included in the fixed component and embedded in the row body of the connecting row (001); The moving component comprises a push rod (003) which is used to drive the contact strip (004) to move. The contact strip (004), the eddy current disk (005) and the coil disk (006) are also included in the moving component, and the push rod (003) is driven to move by the eddy current disk (005) and the coil disk (006).

8. The closing inrush current suppression device for reactive power compensation according to claim 7 is characterized in that: One side of the contact sheet (002) is used to contact the contact strip (004), and the side is exposed to the outer surface of the connecting row (001); The other side of the contact piece (002) is connected to a nonlinear MOV resistor in a corresponding protection branch via a wire.

9. The closing inrush current suppression device for reactive power compensation according to claim 7, characterized in that: The contact strip (004) is installed on the side wall of one end of the push rod (003), and one side of the contact strip (004) is used to contact the contact piece (002), while the other side of the contact strip (004) is connected to the outlet side of the coil disk (006) through a wire; The eddy current disk (005) is a coil, and a through hole is provided in the middle of the disk body for the push rod (003) to pass through when it moves; The coil disk (006) is a coil, and its disk body is fixed on the rod body of the push rod (003), and its incoming line end is connected to the incoming line side of the current suppression branch through a wire.

Images