Phase control device, capacitor combination gate inrush current suppression equipment and method

Abstract

The invention relates to a phase control device of a power distribution circuit device, and capacitor combination gate inrush current suppression equipment and method. The phase control device comprises a phase control suppression unit and an adaptive external member thereof. Wherein the phase control suppression unit comprises a diode group and an energy absorption assembly; the adaptive external member comprises a first side frame and a second side frame. The capacitor combination gate inrush current suppression equipment comprises a controller, a voltage transformer, a current sensor, a circuit breaker, a quick switch and a phase control device. Through application of the equipment and the switching-on and switching-off method thereof, switching-on inrush current and overvoltage during switching of a capacitor bank for reactive compensation in a power distribution network system can be suppressed, and stable operation of the capacitor bank is facilitated; and through the adaptive suite, the adaptability of the phase control suppression unit and the busbar in the equipment cabinet is enhanced, the workload of busbar transformation is reduced, and the phase control inrush current suppression unit can be conveniently increased, decreased and changed in the later period.

Description

Technical Field

[0001] The present invention relates to a power distribution circuit device, and in particular to a phase control device for a power distribution network, a capacitor combination gate inrush current suppression device and a method. Background Art

[0002] In the electric power energy system, the distribution network is responsible for distributing electric power to end users. With the increasing dependence of users on electric power and the application of various high-precision equipment in the industrial field, the requirements for the power supply reliability and quality of the distribution network system are also increasing.

[0003] In order to ensure the power supply reliability and quality of the distribution network system, a parallel capacitor bank is usually connected to the distribution network system to solve the problem. That is, when the power factor of the distribution network system decreases, a parallel capacitor bank is directly put into operation in the distribution network system using a vacuum circuit breaker to compensate for the reactive power of the distribution network system.

[0004] Among them, the capacitor bank used for reactive power compensation of the distribution network system will generate a large inrush current impacting the capacitor bank at the moment of operation. Moreover, the larger the capacity of the capacitor bank, the greater the inrush current generated when the vacuum circuit breaker closes and operates the capacitor bank.

[0005] In addition, when the capacitor bank used for reactive power compensation of the distribution network system is withdrawn, due to the opening and closing of the vacuum circuit breaker, accompanied by the propagation of electromagnetic energy oscillation, overvoltage will occur due to the vacuum circuit breaker cutting off and reigniting. The overvoltage caused by frequent opening and closing operations will cause cumulative damage to the insulation of the components of the line. When the circuit is closed again, it will cause breakdown and short circuit failure due to excessive inrush current, thereby increasing the impact on the capacitor bank. Summary of the invention

[0006] In order to solve the problem proposed in the above background technology that when a capacitor bank connected in parallel to a distribution network system is directly put into the distribution network system for reactive power compensation by using a vacuum circuit breaker, the surge current and overvoltage caused by the closing and opening operation of the vacuum circuit breaker will cause impact damage to the capacitor bank, the present invention provides the following technical solutions:

[0007] A phase control device comprises a phase control suppression unit, and the phase control suppression unit includes a diode group and an energy absorption component.

[0008] The diode group is formed by a plurality of diodes connected in series in the same direction, and each diode is connected in parallel with a group of fixed-value resistors and fixed-value capacitors connected in series.

[0009] The energy absorption component is composed of a nonlinear resistor and is connected in parallel with the diode group to provide overcurrent protection for the diode group.

[0010] Furthermore, the phase-controlled suppression unit further comprises an insulating shell and a wiring terminal. The shell cavity space of the insulating shell is used to accommodate the diode group and the energy absorption component. The wiring terminal is divided into an incoming wiring terminal and an outgoing wiring terminal, and both the incoming wiring terminal and the outgoing wiring terminal are arranged on the shell wall of the insulating shell and are shared by the branch where the diode group is located and the branch where the energy absorption component is located, so as to meet the needs of the branch where the diode group is located and the branch where the energy absorption component is located for external wiring.

[0011] Furthermore, an accommodating space for accommodating the diode group is reserved in the middle of the energy absorbing component, and an insulating inner shell is provided in the accommodating space to separate the diode group from the energy absorbing component.

[0012] Furthermore, the energy absorbing assembly is formed by stacking a plurality of zinc oxide valve sheets with openings in the middle, and the openings of the zinc oxide valve sheets together constitute an accommodating space for accommodating the diode group.

[0013] Furthermore, the incoming wiring terminal and the outgoing wiring terminal are located at opposite ends of the insulating housing. The parts of the incoming wiring terminal and the outgoing wiring terminal exposed outside the insulating housing are both in the shape of tooth bars, and the thread rotation direction of the tooth bar part of the incoming wiring terminal is opposite to that of the tooth bar part of the outgoing wiring terminal.

[0014] A capacitor combination gate inrush current suppression device having the above phase control device, the device also has a voltage transformer, a current sensor, a circuit breaker, a fast switch and a controller.

[0015] The voltage transformer is connected between two-phase lines to monitor the voltage signal of the lines.

[0016] The current sensors are respectively installed on each phase line to monitor the current signal of the line.

[0017] The circuit breaker is installed on each phase line to control the on and off of each phase line.

[0018] The fast switches are respectively installed on the A-phase and C-phase lines to cooperate with the circuit breaker to control the on and off of the lines.

[0019] The phase control device corresponds to the fast switch one by one, and the two are connected in parallel. The branch where the diode group and the branch where the energy absorption component of the same phase control device are located are connected in parallel to the corresponding fast switch, so as to cooperate with the circuit breaker and the fast switch to perform phase control switching to suppress the inrush current and overvoltage in the line when the circuit breaker and the fast switch cooperate to close and open the gate. The negative current direction of each diode in the diode group is the same as the current direction of the fast switch connected in parallel.

[0020] The controller is used to receive, analyze and process the voltage signal of the voltage transformer and the current signal of the current sensor to control the circuit breaker and the fast switch to perform closing and opening actions.

[0021] A further improvement based on the above capacitor combined-switching inrush current suppression device. The phase control device further includes side frame one and side frame two that enable the phase control suppression unit to be adaptively installed on the busbar when the specifications of the phase control suppression unit are fixed or the busbar pitch where the phase control suppression unit is located is fixed. Side frame one and side frame two can synchronously dock with the terminal blocks provided at the opposite ends of the phase control suppression unit, and side frame one and side frame two are respectively installed on the busbars at the incoming and outgoing sides of the fast switch to serve as a circuit component for the parallel connection of the fast switch in the phase control device.

[0022] Further, side frame one includes a fixed row and nut one. One end of the fixed row is installed on the busbar, and the other end is provided with a mounting hole and a card slot for mating with the terminal block. Nut one is installed in the card slot provided on the fixed row and is threaded with the terminal block. The busbar connected to the fixed row forms an electrical circuit path through the fixed row and the phase control device connected to the fixed row.

[0023] Further, side frame two includes a busbar clamp, a row rail, an adjusting row, and a wire. The main body of the busbar clamp is installed on the busbar, and an insertion part is provided outside the main body of the busbar clamp. The row rail includes a pair of rail bodies installed in the insertion part provided on the busbar clamp and damping strips installed on the rail bodies to form a track. The adjusting row can be slidably adjusted along the track formed by the damping strips and is docked with the terminal block. The head end of the wire is installed on the busbar where the busbar clamp is located, and the tail end is installed in the adjusting row. The busbar connected to the wire forms an electrical circuit path through the wire and the adjusting row connected to the wire and the phase control device connected to the adjusting row.

[0024] Further, the main body structure of the busbar clamp is in a U shape. The upper wing plate at the opening of the main body of the busbar clamp is curled downward, and the vertical distance from the lower edge of the curl to the lower wing plate at the opening of the busbar clamp is not less than the thickness of the busbar where the busbar clamp is located. The lower wing plate at the opening of the main body of the busbar clamp is provided with through-hole type bolt holes and bolts threaded therewith. The insertion part of the busbar clamp is connected to the web of the main body of the busbar clamp.

[0025] Further, the rail body is in the shape of an angle steel. One wing plate is evenly provided with slots distributed in a linear array, and the other wing plate is provided with a mounting position for installing the damping strip. The slots are adapted to the insertion part of the busbar clamp.

[0026] Further, the adjusting row includes a row seat, a row clamp, and nut two. One end of the row seat slides on the track formed by the damping strips, and the other end is provided with a mounting hole and a card slot for mating with the terminal block, and a wiring groove is provided in the middle of the row seat. One end of the row clamp covers the wiring groove provided on the row seat to clamp the tail end of the wire, and the other end is provided with a mounting hole for mating with the terminal block. Nut two is installed in the card slot provided on the row seat and is threaded with the terminal block.

[0027] A method applicable to the above capacitor combination gate inrush current suppression device is divided into a closing method and an opening method:

[0028] The closing method is as follows:

[0029] In the initial state, the circuit breaker is in the open state, and the fast switches installed on the A-phase and C-phase lines are both in the open state.

[0030] Action conditions: The controller monitors the voltage signal between phase B and phase C in real time through the voltage transformer, and after receiving the closing command, it first controls the circuit breaker to complete the closing action, then controls the fast switch on the C phase line to complete the closing action, and finally controls the fast switch on the A phase line to complete the closing action.

[0031] When the circuit breaker is closed, the inrush current and overvoltage of the circuit where the fast switch is located are suppressed by the phase-controlled suppression unit connected in parallel with the fast switch.

[0032] The specific opening method is as follows:

[0033] In the initial state, the circuit breaker is in the closed state, and the fast switches installed on the A-phase and C-phase lines are both in the closed state.

[0034] Action conditions: The controller monitors the voltage signal between phase B and phase C in real time through the voltage transformer, and after receiving the opening command, it first controls the fast switches on the phase A and phase C lines to complete the opening action, and then controls the circuit breaker to complete the opening action.

[0035] When the circuit breaker and the fast switch are opened, the inrush current and overvoltage of the circuit where the fast switch is located are suppressed by the phase-controlled suppression unit connected in parallel with the fast switch.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] 1. By installing capacitor combination gate inrush current suppression equipment in the distribution network that uses capacitor banks for reactive power compensation, the inrush current and overvoltage generated during the switching process of the capacitor banks can be solved.

[0038] 2. Through the unique closing and opening mode between the circuit breakers installed on the three-phase lines of phases A, B and C and the fast switches installed on the two-phase lines of phases A and C, the controller is used to control the circuit breakers and fast switches to perform closing and opening actions under preset action conditions, so that the capacitor bank can complete phase switching during the switching process, reducing the degree of inrush current and overvoltage.

[0039] 3. Through the coordination between the diode group and the energy absorption component in the phase control device, the surge current and overvoltage generated by the capacitor group during the switching process can be suppressed.

[0040] Fourth, by setting the diode group in the phase control device, the branch where the fast switch connected in parallel with the diode group is located will cross zero in advance, so that the fast switch can close more quickly. In addition, the inrush current generated by closing the switch when the voltage is zero angle is minimal, which is conducive to the smooth operation of the capacitor bank.

[0041] 5. The phase-controlled suppression unit adopts the whole column packaging, that is, the diode group and the energy absorption component are all packaged inside the same insulating shell, so that the phase-controlled suppression unit looks like a whole from the outside, which is convenient for the overall transportation, installation and replacement of the phase-controlled suppression unit.

[0042] 6. The phase-controlled suppression unit of the whole column package is provided with threaded opposite terminals at the two opposite ends of the insulating shell, so that the side frame 1 and the side frame 2 can be synchronously connected when they are connected, thereby achieving the purpose of simply installing the phase-controlled suppression unit.

[0043] 7. In the side frame 2, the busbar clamp and the rail, and the rail and the adjustment bar are all adjustable, so that the phase-controlled suppression unit of the same specification can adapt to the busbar spacing within a certain range. That is, when the specification of the phase-controlled suppression unit is fixed, the phase-controlled suppression unit can be installed on the busbar of any spacing through the cooperation of the side frame 1 and the side frame 2.

[0044] 8. In the side frame 2, the busbar clamp and the rail, and the rail and the adjustment row are all adjustable, so that the same busbar spacing can adapt to the specifications of the phase control suppression unit within a certain range. That is, when the busbar rack is fixed, the busbar of this spacing can be installed with any specification of phase control suppression unit through the cooperation of the side frame 1 and the side frame 2. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a wiring diagram of the closing inrush current suppression device of the present invention;

[0046] Figure 2 It is a front view of the closing inrush current suppression device of the present invention;

[0047] Figure 3 This is a left view inside the cabinet of the closing inrush current suppression device of the present invention;

[0048] Figure 4 It is a schematic diagram of the installation of the phase control device of the present invention;

[0049] Figure 5 It is a front view of the phase-controlled suppression unit of the present invention;

[0050] Figure 6 It is a wiring diagram of the phase-controlled suppression unit of the present invention;

[0051] Figure 7 This is a schematic diagram of the side frame 1 of the present invention being installed before the busbar;

[0052] Figure 8 It is a schematic diagram of the side frame 1 of the present invention being installed on the busbar;

[0053] Fig. 9 The structural explosion of the side frame of the present invention Figure 1 ;

[0054] Fig.10 The structural explosion of the side frame of the present invention Figure 2 ;

[0055] Fig.11 This is a schematic diagram of the second side frame of the present invention being installed before the busbar;

[0056] Fig.12 It is a schematic diagram of the side frame 2 of the present invention being installed on the busbar;

[0057] Fig.13 It is a schematic diagram of the structure of the busbar clamp of the present invention;

[0058] Fig.14 It is a side view of the busbar clamp of the present invention;

[0059] Fig.15 This is an exploded view of the track arrangement structure of the present invention;

[0060] Fig.16 The structural explosion of the row is adjusted by the present invention Figure 1 ;

[0061] Fig.17 The structural explosion of the row is adjusted by the present invention Figure 2 ;

[0062] Fig.18 It is a structural schematic diagram of the conductor of the present invention;

[0063] Fig.19 This is a comparison diagram of the same phase-controlled suppression unit of the present invention under different busbar spacing conditions;

[0064] Fig. 20 It is a comparison diagram of different phase-controlled suppression units of the present invention under the same busbar spacing working condition.

[0065] In the accompanying drawings, the names of the components represented by the reference numerals are listed as follows:

[0066] 1-housing, 01-current sensor, 02-circuit breaker, 03-fast switch, 04-phase control device;

[0067] 100-phase control suppression unit;

[0068] 200-side frame one, 210-fixed row, 220-nut one;

[0069] 300-side frame 2, 310-busbar clamp, 320-rail, 330-adjustment bar, 340-conductor;

[0070] 321-rail body, 322-damping strip;

[0071] 331-seat, 332-clamp, 333-nut two. DETAILED DESCRIPTION

[0072] 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.

[0073] The present invention provides a technical solution for a phase control device 04, which is as follows:

[0074] See also Figure 6 , the figure shows a wiring diagram of the phase control suppression unit 100. FR represents an energy absorbing component; D1, D2, D3 and D4 all represent diodes; r1, r2, r3 and r4 all represent fixed value resistors, and c1, c2, c3 and c4 all represent fixed value capacitors.

[0075] The phase control device 04 includes a phase control suppression unit 100 , and the phase control suppression unit 100 includes a diode group and an energy absorption component, and the diode group and the energy absorption component are connected in parallel.

[0076] in:

[0077] The diode group includes a plurality of diodes connected in series in the same direction, and each diode is connected in parallel with a diode protection branch. That is, the forward current direction inside each diode remains consistent. In addition, each diode protection branch is formed by connecting at least one fixed value resistor and at least one fixed value capacitor in series.

[0078] The energy absorption component is composed of nonlinear resistors and is used to protect the diode group from overcurrent. That is, when the voltage across the energy absorption component rises to its own conduction point voltage, the energy absorption component is turned on, the current is diverted to the energy absorption component and converted into heat, reducing the current of the diode group, and ultimately limiting the voltage across the diode group.

[0079] In this technical solution:

[0080] A reverse voltage is applied to the diode group. If the applied reverse voltage is lower than the reverse breakdown voltage of the diode group, the diode group is in a reverse cutoff state (only a weak reverse saturation current flows through), and the diode group plays a role in suppressing the inrush current; if the applied reverse voltage reaches or even exceeds the reverse breakdown voltage of the diode group, the diode group is in a reverse breakdown state due to reverse conduction. Continue to increase the reverse voltage of the diode group until the reverse voltage exceeds the maximum reverse voltage that the diode group can bear, and the diode group will undergo avalanche breakdown. In this way, before the diode group undergoes avalanche breakdown, the diode group can achieve the purpose of limiting the current in the circuit to which it is connected.

[0081] The conduction point voltage of the energy absorbing component is lower than the maximum reverse voltage that the diode group can bear (preferably, the conduction point voltage of the energy absorbing component is lower than the reverse breakdown voltage of the diode group). After the voltage across the diode group reaches the conduction point voltage of the energy absorbing component, the energy absorbing component is turned on. Affected by the volt-ampere characteristics of the energy absorbing component, the current that the energy absorbing component can absorb increases dramatically with each increase in the voltage across its two ends, thereby achieving the effect of limiting the voltage across its two ends. In addition, since the energy absorbing component can suppress the voltage across itself, the voltage across the diode group can be suppressed, thereby preventing the diode group from being damaged due to breakdown.

[0082] Embodiment 1

[0083] Based on the technical solution of the above-mentioned phase-controlled device 04 , this embodiment provides a packaging solution for the phase-controlled suppression unit 100 .

[0084] See also Figure 6 , the figure shows a wiring diagram of the phase-controlled suppression unit 100.

[0085] The same phase-controlled suppression unit 100 includes at least one diode group and one energy absorption component, and the diode group and the energy absorption component are packaged separately and are independent of each other.

[0086] Preferably, D1, D2, D3 and D4 all represent the same diode; r1, r2, r3 and r4 all represent the same fixed-value resistor; and c1, c2, c3 and c4 all represent the same fixed-value capacitor.

[0087] Preferably, the energy absorption component is formed by stacking a number of nonlinear zinc oxide valve sheets. That is, when the voltage at both ends of the energy absorption component rises to its conduction point voltage, the energy absorption component is turned on, and as the current flowing through the energy absorption component increases, the voltage of the energy absorption component is limited, and at this time, the volt-ampere characteristic curve of the energy absorption component is relatively flat. In this way, the peak voltage at both ends of the diode group can be instantly suppressed by the energy absorption component to prevent the diode group from being damaged due to breakdown. At the same time, when the energy absorption component is not turned on, its resistance is extremely large, and the current cannot flow through it, so that the current can accumulate quickly at both ends of the diode group, increase the voltage at both ends of the diode group, and then enable the diode group to reach the conduction voltage more quickly when it needs to be turned on. That is, it helps to improve the response speed of the diode group circuit conduction.

[0088] In this embodiment:

[0089] When the voltage on both sides of the energy absorbing component does not rise to the conduction point voltage, the energy absorbing component is in a non-conducting state, and the current flowing through the energy absorbing component is extremely small, at the microampere level. Therefore, the power consumption generated by the energy absorbing component can be ignored, so that it will not affect the diode group.

[0090] After the voltage across the diode group rises to the conduction point voltage of the energy absorbing component, the energy absorbing component is turned on, so that the energy absorbing component will shunt the current of the diode group, and as the current at the energy absorbing component increases, the energy absorbing component limits its own voltage through its own volt-ampere characteristics, thereby achieving the effect of limiting the voltage across the diode group. That is, the purpose of overvoltage protection of the diode group is achieved by using the volt-ampere characteristics of the energy absorbing component.

[0091] After the voltage across the diode group is suppressed, when the voltage across the energy absorbing component drops below its conduction point voltage, the energy absorbing component will immediately enter a high impedance state. That is, the energy absorbing component automatically enters a non-conducting state, and this action does not require the use of other measures (such as installing a fuse or shutting down and resetting). This automatic conversion method not only has a fast response speed, but also saves the cost of adopting other measures.

[0092] Embodiment 2

[0093] Based on the technical solution provided in the first embodiment, this embodiment provides another packaging solution for the phase-controlled suppression unit 100 .

[0094] See also Figure 5 , a front view of the phase-controlled suppression unit 100 is shown in the figure.

[0095] The difference between this embodiment and the first embodiment is that:

[0096] The phase control suppression unit 100 further comprises an insulating housing and a terminal. The diode group and the energy absorption component in the same phase control suppression unit 100 are both integrally packaged in the shell cavity of the insulating housing, and are no longer independently packaged.

[0097] Preferably, the wiring terminals are divided into an incoming wiring terminal and an outgoing wiring terminal, and the incoming wiring terminal and the outgoing wiring terminal are respectively arranged on the opposite end walls of the insulating housing. The incoming wiring terminal and the outgoing wiring terminal are shared by the branch where the diode group is located and the branch where the energy absorption component is located, and both branches are connected to the outside through the incoming wiring terminal and the outgoing wiring terminal. In addition, the parts of the incoming wiring terminal and the outgoing wiring terminal exposed outside the insulating housing are both in the shape of toothed rods, and the thread rotation directions of the two are opposite.

[0098] Preferably, a receiving space for accommodating the diode group is reserved in the middle of the energy absorbing component, and an insulating inner shell is provided in the receiving space to separate the diode group from the energy absorbing component to prevent mutual interference between the diode group and the energy absorbing component (eg, an electric arc directly occurring between the two).

[0099] More preferably, when the energy absorption assembly is formed by stacking a plurality of zinc oxide valve sheets, a through opening may be provided in the middle of each zinc oxide valve sheet, so that the through openings of the stacked zinc oxide valve sheets together form an accommodating space for accommodating the diode group.

[0100] The present invention provides a technical solution for a capacitor combination gate inrush current suppression device, which is as follows:

[0101] See also Figure 1-Figure 3 The capacitor combination gate inrush current suppression device provided by the present invention includes a voltage transformer, a current sensor 01, a circuit breaker 02, a fast switch 03, a phase control device 04 and a controller.

[0102] in:

[0103] The voltage transformer is connected between two-phase lines and is used to monitor the voltage signal of the line.

[0104] The current sensor 01 monitors the current signal of the line where it is located, and each of the three-phase lines A, B and C is equipped with a current sensor 01.

[0105] The circuit breaker 02 is installed on each phase line to control the on / off status of each phase line.

[0106] The fast switch 03 controls the on / off state of the line by cooperating with the circuit breaker 02, and the A-phase and C-phase lines are each equipped with a fast switch 03.

[0107] The phase control device 04 corresponds to the fast switch 03 one by one, and the two are connected in parallel. The branch where the diode group and the branch where the energy absorption component are located in the same phase control device 04 are connected in parallel to the fast switch 03 corresponding to the phase control device 04, so as to suppress the inrush current and overvoltage in the line where the fast switch 03 is located.

[0108] The controller is used to receive, analyze and process the voltage signal of the voltage transformer and the current signal of the current sensor 01, so as to make corresponding control decisions and control the circuit breaker 02 and the fast switch 03 to perform closing and opening actions.

[0109] In this technical solution:

[0110] When a reverse voltage is applied to the diode group, the direction of the current inside it is the same as the direction of the current flowing through the fast switch 03 when the fast switch 03 connected in parallel is turned on. That is, the cathode of the diode group points to the bus side, and the anode of the diode group points to the load side.

[0111] For the capacitor combination gate inrush current suppression device, its incoming line side is connected to the busbar, and its outgoing line side is connected to the load.

[0112] Internally, the capacitor combination gate inrush current suppression device has three internal circuit states, as follows:

[0113] State 1, i.e., current suppression state. In this state, the circuit breaker 02 is in the closed position, the fast switch 03 is in the open position, and the current supplied from the bus side follows the path of current sensor 01-circuit breaker 02-diode group inside the device, and flows from the device to the load. In this way, the inrush current can be suppressed by using the diode group.

[0114] State 2, i.e., commissioning state. In this state, the circuit breaker 02 and the fast switch 03 are both in the closed position, and the current supplied from the bus side follows the path of current sensor 01-circuit breaker 02-fast switch 03 inside the device, and flows from the outgoing side of the device to the load. In this way, the load connected to the outgoing side of the device is commissioned into the power system of the bus connected to the incoming side of the device.

[0115] State three, i.e., voltage limiting state. In this state, the circuit breaker 02 is in the closed position, and the fast switch 03 is in the closed position or the open position. If the current supplied by the bus side accumulates at the end of the fast switch 03 (or the diode group) and causes the voltage to rise, and reaches the voltage of the conduction point of the energy absorption component, a shunt path is formed inside the device due to the shunting of the energy absorption component. The path is current sensor 01-circuit breaker 02-energy absorption component, and the current not consumed by the energy absorption component flows from the side of the device to the load. In this way, the overvoltage can be limited by using the energy absorption component.

[0116] Embodiment 3

[0117] Based on the first embodiment, this embodiment provides a capacitor combination gate inrush current suppression device using the phase control device 04 in the first embodiment. This embodiment takes the application of the device to the distribution network as an example. When the device is applied in the distribution network, the incoming line side of the device is connected to the busbar of the distribution network, and the line side is connected to a capacitor bank for reactive power compensation of the distribution network. That is, the capacitor bank is connected to the outgoing line side of the capacitor combination gate inrush current suppression device as a load.

[0118] See also Figure 1 , the figure shows the wiring diagram of the closing inrush current suppression device. In the figure, A, B and C respectively represent the A-phase line, B-phase line and C-phase line in the AC power distribution network system; 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.

[0119] See also Figure 2 , the figure shows the front view of the closing inrush current suppression device.

[0120] See also Figure 3 , the figure shows the left view inside the closing inrush current suppression equipment cabinet.

[0121] Preferably, the device further comprises a housing 1. The voltage transformer, current sensor 01, circuit breaker 02, fast switch 03, phase control device 04 and controller are all installed in the shell cavity space of the housing 1. The voltage transformer and current sensor can also be installed outside the housing 1. In addition, a busbar for circuit connection is also installed in the housing 1.

[0122] More preferably, the housing 1 is generally of a cabinet type or a column type.

[0123] Preferably, the voltage transformer is connected between the B-phase and C-phase lines and is located on the incoming line side of the circuit breaker 02, and is used to collect the voltage signal between the B-phase and C-phase lines in real time, and provide the collected voltage signal to the controller for analysis and processing, so as to monitor the voltage signal between the B-phase and C-phase lines in real time.

[0124] Preferably, the current sensors 01 installed on the three-phase lines of phase A, phase B and phase C respectively provide the collected current signals to the controller for analysis and processing, so as to monitor the current signals on the three-phase lines in real time.

[0125] More preferably, the current sensor 01 can be installed on the incoming line side or the outgoing line side of the circuit breaker 02 , and can also be installed on the incoming line side or the outgoing line side of the fast switch 03 .

[0126] Preferably, the circuit breaker 02 and the fast switch 03 cooperate to realize the switching of the capacitor bank. That is, when the circuit breaker 02 and the fast switch 03 are both in the closed state, the capacitor bank is put into operation in the distribution network system, and the capacitor bank is used to perform reactive power compensation on the distribution network system, thereby ensuring the power supply reliability and quality of the distribution network system; when the circuit breaker 02 and the fast switch 03 are both in the open state, the capacitor bank is withdrawn from the distribution network system.

[0127] More preferably, the circuit breaker 02 is a three-phase circuit breaker, and can synchronously switch on and off the A-phase, B-phase and C-phase lines at its location.

[0128] Preferably, the fast switch 03 is an eddy current driven fast circuit breaker. A fast switch 03 is installed on each of the A-phase and C-phase lines, and the installed fast switches 03 are located at the outgoing line side of the circuit breaker 02 in the respective lines.

[0129] Preferably, each fast switch 03 is individually connected in parallel with a phase control device 04. The branch where the diode group of the phase control device 04 is located and the branch where the energy absorption component is located are both connected to the busbar provided in the housing 1 for installing the phase control device 04.

[0130] Preferably, the controller is used to receive, analyze, and process the voltage signal of the voltage transformer and the current signal of the current sensor 01, and can send control signals to the circuit breaker 02 and the fast switch 03. In this way, when the capacitor bank needs to be switched on and off, the controller will monitor the voltage signal through the voltage transformer after receiving the closing and opening command, and control the circuit breaker 02 and the fast switch 03 to close and open the circuit within the preset voltage angle range. In addition, the current signal collected by the current sensor 01 is analyzed and processed by the controller, and then recorded and uploaded to the server by the controller so that relevant personnel can view the effect of inrush current suppression through the data.

[0131] In this embodiment:

[0132] When the capacitor group needs to be put into operation in the distribution network, the circuit breaker 02 is closed first to enter the current suppression state in order to suppress the inrush current; after the inrush current is suppressed, the bypass switch 03 is closed to enter the operation state, so that the diode group is withdrawn, and the capacitor group stably enters the working state of reactive power compensation for the distribution network, thus realizing the operation of the capacitor group.

[0133] When the capacitor bank needs to be withdrawn from the distribution network, first open the bypass switch 03 to enter the current suppression state to suppress the inrush current; after the inrush current suppression is completed, open the circuit breaker 02 to realize the withdrawal of the capacitor bank.

[0134] Regardless of whether the capacitor bank is put into operation or withdrawn, if the voltage at the bypass switch 03 terminal rises to the conduction point voltage of the energy absorption component, the energy absorption component is turned on and enters the voltage limiting state, and the energy absorption component shunts the current and limits the voltage.

[0135] Based on the technical solution of the capacitor combination gate inrush current suppression device, the present invention provides another improved solution, which is as follows:

[0136] See also Figure 1-Figure 20 The solution provided by the present invention is different from the above solution in that:

[0137] The phase control device 04 used in the capacitor combination gate inrush current suppression device in this solution has a phase control suppression unit 100 that adopts the packaging solution in the second embodiment.

[0138] The phase control device 04 used in the capacitor combination gate inrush current suppression device in this solution also includes a side frame 1 200 and a side frame 2 300 that enable the phase control suppression unit 100 to be adaptively installed on the busbar. That is, when the specifications of the phase control suppression unit 100 are fixed or the busbar spacing where the phase control suppression unit 100 is located is fixed, the phase control suppression unit 100 can be adaptively installed on the busbar. The side frame 1 200 and the side frame 2 300 can synchronously connect the connection terminals set at the opposite ends of the phase control suppression unit 100, and the side frame 1 200 and the side frame 2 300 are respectively installed on the busbars on the incoming and outgoing sides of the fast switch 03, so that they serve as the circuit components for the phase control device 04 to connect the fast switch 03 in parallel.

[0139] In this technical solution:

[0140] The busbars for installing the phase control device 04 in the housing 1 are divided into an incoming busbar and an outgoing busbar. The side frame 1 200 and the side frame 2 300 are installed on the incoming busbar and the outgoing busbar respectively. If the side frame 1 200 is installed on the incoming busbar, the side frame 2 300 is installed on the outgoing busbar; if the side frame 1 200 is installed on the outgoing busbar, the side frame 2 300 is installed on the incoming busbar.

[0141] The phase control suppression unit 100 is placed between the side frame 1 200 and the side frame 2 300, and the incoming wiring terminal and the outgoing wiring terminal of the phase control suppression unit 100 are respectively wired to the side frame 1 200 and the side frame 2 300. If the side frame 1 200 is installed on the incoming busbar, the incoming wiring terminal of the phase control suppression unit 100 is connected to the side frame 1 200, and the outgoing wiring terminal thereof is connected to the side frame 2 300; if the side frame 1 200 is installed on the outgoing busbar, the incoming wiring terminal of the phase control suppression unit 100 is connected to the side frame 2 300, and the outgoing wiring terminal thereof is connected to the side frame 1 200.

[0142] Embodiment 4

[0143] Based on the third embodiment, this embodiment provides a capacitor combination gate inrush current suppression device using the phase control device 04 in the second embodiment. That is, this embodiment is based on the third embodiment, and the phase control device 04 in the first embodiment in the third embodiment is replaced by the phase control device 04 in the second embodiment. The differences between this embodiment and the third embodiment are as follows:

[0144] See also Figure 7-Figure 18 , the figure shows the specific structure diagram of side frame 1 200 and side frame 2 300.

[0145] See also Fig.19 and Fig. 20 , the figure takes the outgoing busbar being located below the incoming busbar as an example, and gives the installation position relationship between the phase control suppression unit 100, the side frame 1 200 and the side frame 2 300.

[0146] Preferably, the side frame 200 includes a fixed row 210 and a nut 220. One end of the fixed row 210 is mounted on the outgoing busbar, and the other end thereof is provided with a mounting hole and a slot for docking with the wiring terminal. The nut 220 is installed in the slot provided in the fixed row 210 and is threaded with the wiring terminal. The outgoing busbar is connected to the outgoing wiring terminal of the phase control suppression unit 100 through the fixed row 210 to form a circuit path. In addition, the side frame 200 plays a major load-bearing role and bears the function of the phase control suppression unit 100.

[0147] Preferably, the side frame 2 300 includes a busbar clamp 310, a rail 320, an adjustment bar 330 and a conductor 340. The main body of the busbar clamp 310 is installed on the incoming busbar, and an insertion portion is provided on the outside. The rail 320 includes a pair of rail bodies 321 installed on the insertion portion provided on the busbar clamp 310 and a damping bar 322 installed on the rail body 321 to form a track. The adjustment bar 330 can be slidably adjusted along the track formed by the damping bar 322 and docked with the terminal. The head end of the conductor 340 is installed on the incoming busbar, and the tail end thereof is installed in the adjustment bar 330. Among them, the incoming busbar is connected to the incoming terminal of the phase control suppression unit 100 through the conductor 340 and the adjustment bar 330 to form a circuit path.

[0148] More preferably, the main body structure of the busbar clamp 310 is in a U shape. The upper side wing plate at the opening of the main body of the busbar clamp 310 is curled downwards, which facilitates the busbar clamp to hold the busbar body by the curled edge; the vertical distance h from the lower edge of the curled edge to the lower side wing plate at the opening of the busbar clamp 310 is not less than the thickness of the incoming busbar, which facilitates the busbar clamp 310 to be stuck on the busbar body through its opening. The lower side wing plate at the opening of the main body of the busbar clamp 310 is provided with a through-hole type bolt hole and a bolt screwed thereto. After the opening of the busbar clamp 310 is buckled on the busbar body, tightening the bolt can fasten the busbar clamp 310 on the busbar. The insertion part of the busbar clamp 310 is connected to the web of the busbar clamp main body, and the two form a U-shaped structure, which facilitates the busbar clamp 310 to hold the slot of the rail body 321.

[0149] More preferably, the busbar clamp 310 is an insulator. In addition, the position on the busbar body for installing the busbar clamp 310 is coated with an insulating sleeve, such as insulating paint skin or insulating leather sleeve.

[0150] More preferably, the rail body 321 is in an angle steel shape. One wing plate of the rail body 321 is uniformly provided with slots distributed in a linear array, and the slots are adapted to the insertion part of the busbar clamp 310; the other wing plate of the rail body 321 is provided with an installation position for installing the damping strip 322.

[0151] More preferably, the busbar rail 320 is an insulator.

[0152] More preferably, the adjusting row 330 includes a row seat 331, a row clamp 332 and a second nut 333. One end of the row seat 331 slides on the track formed by the damping strip 322, and the other end is provided with an installation hole and a card slot for mating with the connection terminal, and a wiring groove is provided in the middle of the row seat 331. One end of the row clamp 332 covers above the wiring groove provided on the row seat 331 to clamp the tail end of the wire 340, and the other end is provided with an installation hole for mating with the connection terminal. The second nut 333 is installed in the card slot provided on the row seat 331 and is screwed to the connection terminal, and the tighter the two are screwed, the tighter the row clamp 332 and the row seat 33 clamp the wire 340.

[0153] More preferably, the row seat 331 is an insulator, and the row clamp 332 and the second nut 333 are conductors.

[0154] More preferably, the outer surface of the middle section of the wire 340 is coated with an insulating sleeve.

[0155] In this embodiment:

[0156] The side frame 1 200 is installed on the outgoing busbar, while the side frame 2 300 is installed on the incoming busbar, and the side frame 1 200 is located below the side frame 2 300, so that the side frame 1 200 can bear the weight of the phase control suppression unit 100. For the installation of the side frame 1 200, the fixed row 210 is fastened to the outgoing busbar by the cooperation of bolts and nuts; for the installation of the side frame 2 300, the busbar clamp 310 is fastened to the incoming busbar by the bolts threaded by the busbar clamp 310, and one end of the wire 340 is fastened to the incoming busbar by the cooperation of bolts and nuts, and the other end of the wire 340 is clamped by the row seat 331 and the row clamp 332 in the wiring slot provided in the middle of the row seat 331.

[0157] After the installation of the side frame 1 200 and the side frame 2 300 is completed, the adjustment row 330 is slid so that the phase control suppression unit 100 can be placed between the fixed row 210 and the adjustment row 330. After the phase control suppression unit 100 is placed between the fixed row 210 and the adjustment row 330, the adjustment row 330 is slid again, and the phase control suppression unit 100 is adjusted so that the incoming wire terminal of the phase control suppression unit 100 is inserted into the hole of the nut 2 333, and the outgoing wire terminal is inserted into the hole of the nut 1 220. In this way, the phase control suppression unit 100 is rotated so that the nut 1 220 and the nut 2 333 can be respectively threaded with the wire terminals at both ends of the phase control suppression unit 100, and they are tightened synchronously, thereby completing the installation of the phase control suppression unit 100. Similarly, after the phase-controlled suppression unit 100 is installed, the phase-controlled suppression unit 100 is rotated in the opposite direction so that the nut 1 220 and the nut 2 333 are simultaneously loosened from the terminal of the phase-controlled suppression unit 100 and finally detached from the terminal so as to remove the phase-controlled suppression unit 100.

[0158] During the above-mentioned process of rotating the phase control suppression unit 100 , the adjustment row 300 slides along the damping strip 322 .

[0159] Embodiment 5

[0160] Based on the fourth embodiment, this embodiment provides an installation method in which the incoming busbar is located below the outgoing busbar.

[0161] See also Fig.19 and Fig. 20 , the figure shows the installation position relationship between the phase control suppression unit 100, the side frame 1 200 and the side frame 2 300.

[0162] The difference between this embodiment and the fourth embodiment is that:

[0163] Side frame 1 200 is installed on the incoming busbar, while side frame 2 300 is installed on the outgoing busbar.

[0164] The inlet terminal of the surge suppression unit 100 is connected to the nut 1 220 by thread, and the outlet terminal thereof is connected to the nut 2 333 by thread.

[0165] Embodiment 6

[0166] Based on the fourth embodiment or the fifth embodiment, this embodiment provides an unconventional installation method of the phase-controlled suppression unit 100. That is, the phase-controlled suppression unit 100 is installed obliquely or horizontally.

[0167] When the space in the cabinet is sufficient for the phase control suppression unit 100 to be installed obliquely in the cabinet, the phase control suppression unit 100 can be installed in the cabinet in an oblique installation manner. That is, if the space between the incoming busbar and the outgoing busbar for arranging the phase control suppression unit 100 is an inclined space, an oblique installation is adopted.

[0168] When the space in the cabinet is sufficient for the phase control suppression unit 100 to be installed horizontally in the cabinet, the phase control suppression unit 100 can be installed in the cabinet in a horizontal installation manner. That is, if the space between the incoming busbar and the outgoing busbar for arranging the phase control suppression unit 100 is a horizontal space, a horizontal installation is adopted.

[0169] The present invention provides a closing method for a capacitor combination gate inrush current suppression device, which is applicable to the above-mentioned two capacitor combination gate inrush current suppression devices, and is specifically as follows:

[0170] In the initial state, the circuit breaker 02 is in the open state, and the fast switches 03 installed on the A-phase and C-phase lines are both in the open state.

[0171] Action conditions: The controller monitors the voltage signal between phase B and phase C in real time through the voltage transformer, and after receiving the closing command, first controls the circuit breaker 02 to complete the closing action, then controls the fast switch 03 on the C phase line to complete the closing action, and finally controls the fast switch 03 on the A phase line to complete the closing action.

[0172] When the circuit breaker 02 is closed, the inrush current and overvoltage of the circuit where the fast switch 03 is located are suppressed by the phase control suppression unit 100 connected in parallel with the fast switch 03 .

[0173] Embodiment 7

[0174] Based on the third embodiment or the fourth embodiment, this embodiment provides a preferred closing solution for the circuit breaker 02 and the fast switch 03, which is as follows:

[0175] In the action condition of the closing method, the circuit breaker 02 is at 290°≤U bc ≤360°, the closing action is completed, and the fast switch 03 on the C phase line is at U bc =415° or U bc ≈415°, the closing action is completed, and finally the fast switch 03 on the A phase line is controlled at U bc =475° or Ubc The closing action is completed under the condition of ≈475°. bc Monitor the voltage signal between phase B and phase C for the voltage transformer in real time.

[0176] The present invention provides a method for opening a capacitor combination gate inrush current suppression device, which is applicable to the above-mentioned two capacitor combination gate inrush current suppression devices, and is specifically as follows:

[0177] In the initial state, the circuit breaker 02 is in the closed state, and the fast switches 03 installed on the A-phase and C-phase lines are both in the closed state;

[0178] Action conditions: The controller monitors the voltage signal between phase B and phase C in real time through the voltage transformer, and after receiving the opening command, it first controls the fast switch 03 on the phase A and phase C lines to complete the opening action, and then controls the circuit breaker 02 to complete the opening action.

[0179] When the circuit breaker 02 and the fast switch 03 are opened, the inrush current and overvoltage of the circuit where the fast switch 03 is located are suppressed by the phase control suppression unit 100 connected in parallel to the fast switch 03 .

[0180] Embodiment 8

[0181] Based on the third embodiment or the fourth embodiment, this embodiment provides a preferred opening scheme of the circuit breaker 02 and the fast switch 03, which is as follows:

[0182] In the operating conditions of the opening method, the fast switch 03 on the A phase and C phase lines is at 0°≤U bc ≤60°, the circuit breaker 02 will open 10ms after the fast switch 03 on the A-phase and C-phase lines completes the opening action. bc Monitor the voltage signal between phase B and phase C for the voltage transformer in real time.

[0183] 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 phase control device (04), characterized in that: A phase-controlled suppression unit (100) is included, and the phase-controlled suppression unit (100) comprises: The diode group is formed by connecting a plurality of diodes in series in the same direction, and each diode is connected in parallel with a set of fixed value resistors and fixed value capacitors connected in series; The energy absorbing component is composed of a nonlinear resistor and is connected in parallel with the diode group to provide overcurrent protection for the diode group.

2. The phase control device (04) according to claim 1, characterized in that: The phase-controlled suppression unit (100) further comprises: The insulating shell, the diode group and the energy absorbing component are all installed in the shell cavity space of the insulating shell; The wiring terminals are divided into incoming wiring terminals and outgoing wiring terminals, and both are arranged on the shell wall of the insulating shell, and are shared by the branch where the diode group is located and the branch where the energy absorption component is located, so as to prepare for the need of external wiring of the two branches.

3. The phase control device (04) according to claim 1 or 2, characterized in that: An accommodating space for accommodating a diode group is reserved in the middle of the energy absorbing component, and an insulating inner shell is arranged in the accommodating space to separate the diode group from the energy absorbing component.

4. The phase control device (04) according to claim 3, characterized in that: The energy absorption component is formed by stacking a plurality of zinc oxide valve sheets with openings in the middle, and the openings of the zinc oxide valve sheets together form an accommodating space for accommodating the diode group.

5. The phase control device (04) according to claim 2, characterized in that: The incoming wiring terminal and the outgoing wiring terminal are located at opposite ends of the insulating housing; The parts of the incoming wiring terminal and the outgoing wiring terminal exposed outside the insulating shell are both in the shape of threaded rods, and the thread rotation directions of the two are opposite.

6. A capacitor combination gate inrush current suppression device having the phase control device (04) according to claim 1, characterized in that: The device also features: Voltage transformer, connected between two-phase lines to monitor the voltage signal of the line; A current sensor (01) is installed on each phase line to monitor the current signal of the line; A circuit breaker (02) is installed on each phase line to control the on and off of each phase line; The fast switch (03) is installed on the two-phase circuits of phase A and phase C respectively to cooperate with the circuit breaker (02) to control the on and off of the circuits; A controller, used for receiving, analyzing and processing a voltage signal of a voltage transformer and a current signal of a current sensor (01) to control a circuit breaker (02) and a fast switch (03) to perform closing and opening operations; The phase control device (04) corresponds to the fast switch (03) one by one, and the two are connected in parallel. The branch where the diode group and the branch where the energy absorption component of the same phase control device (04) are located are connected in parallel to the corresponding fast switch (03) to cooperate with the circuit breaker (02) and the fast switch (03) to perform phase control switching to suppress the surge current and overvoltage in the line when the circuit breaker (02) and the fast switch (03) are closed and opened. The negative current direction of each diode in the diode group is the same as the current direction of the fast switch (03) connected in parallel.

7. A capacitor combination gate inrush current suppression device having the phase control device (04) as claimed in claim 5, characterized in that: The device also features: Voltage transformer, connected between two-phase lines to monitor the voltage signal of the line; A current sensor (01) is installed on each phase line to monitor the current signal of the line; A circuit breaker (02) is installed on each phase line to control the on and off of each phase line; Quick switches (03) are respectively installed on the two-phase lines of phase A and phase C to cooperate with the circuit breaker (02) to control the on-off of the lines where they are located; A controller is used to receive, analyze, and process the voltage signals of the voltage transformer and the current signals of the current sensor (01) to control the circuit breaker (02) and the quick switches (03) to perform closing and opening operations; The phase control devices (04) correspond one-to-one with the quick switches (03), and the two are connected in parallel. The branches where the diode groups of the same phase control device (04) are located and the branches where the energy absorption components are located are all connected in parallel to the corresponding quick switches (03) to cooperate with the circuit breaker (02) and the quick switches (03) for phase-controlled switching to suppress the inrush current and overvoltage in the line when the circuit breaker (02) and the quick switches (03) perform closing and opening operations. The negative current directions of the diodes in the diode group are all in the same direction as the current direction of the quick switch (03) in parallel therewith; The phase control device (04) further includes a side frame one (200) and a side frame two (300) that enable the phase control suppression unit (100) to be adaptively installed on the busbar. The side frame one (200) and the side frame two (300) can synchronously dock the terminal blocks provided at the opposite ends of the phase control suppression unit (100), and the side frame one (200) and the side frame two (300) are respectively installed on the busbars at the incoming and outgoing line sides of the quick switch (03) to serve as a circuit component for the phase control device (04) to be connected in parallel with the quick switch (03).

8. The capacitor combination gate inrush current suppression device according to claim 7, characterized in that: The side frame one (200) includes: A fixed row (210) with one end installed on the busbar and the other end provided with an installation hole and a card slot for cooperating with the terminal block to dock; A nut one (220) installed in the card slot provided on the fixed row (210) and threadedly connected to the terminal block; The busbar connected to the fixed row (210) forms an electrical circuit path through the fixed row (210) and the phase control device (04) connected to the fixed row (210).

9. The capacitor combination gate inrush current suppression device according to claim 7 or 8, characterized in that: The side frame two (300) includes: A busbar clamp (310) with its main body installed on the busbar and an insertion part provided on the outside; A row rail (320) including a pair of rail bodies (321) installed in the insertion part provided on the busbar clamp (310) and damping strips (322) installed on the rail bodies (321) to form a track; An adjusting row (330) that can slide and adjust along the track formed by the damping strips (322) and is docked with the terminal block; A wire (340) with its head end installed on the busbar where the busbar clamp (310) is located and its tail end installed in the adjusting row (330); The busbar connected to the wire (340) forms an electrical circuit path through the wire (340), the adjusting row (330) connected to the wire (340), and the phase control device (04) connected to the adjusting row (330).

10. The capacitor combination inrush current suppression device according to claim 9, wherein: The main body structure of the busbar clamp (310) is in a U shape; The upper side wing plate at the opening of the main body of the busbar clamp (310) is curled downward, and the vertical distance from the lower edge of the curl to the lower side wing plate at the opening of the busbar clamp (310) is not less than the thickness of the busbar where the busbar clamp (310) is located; The lower side wing plate at the main body opening of the busbar clamp (310) is provided with a through-hole type bolt hole and a bolt threadedly connected thereto; The insertion portion of the busbar clamp (310) is connected to the web of the busbar clamp body.

11. The capacitor combination gate inrush current suppression device according to claim 9, characterized in that: The rail body (321) is in the shape of an angle steel, one wing plate of which is evenly provided with slots distributed in a linear array, and the other wing plate is provided with an installation position for installing a damping strip (322); The slot is adapted to the insertion portion of the busbar clamp (310).

12. The capacitor combination gate inrush current suppression device according to claim 9, characterized in that: The regulating row (330) comprises: A row seat (331) has one end that slides on a track formed by the damping strip (322), and the other end is provided with a mounting hole and a slot that match the wiring terminal, and a wiring slot is provided in the middle of the row seat (331); A row clamp (332), one end of which covers the wiring slot provided on the row seat (331) to clamp the tail end of the wire (340), and the other end of which is provided with a mounting hole for docking with the wiring terminal; The second nut (333) is installed in the slot provided in the row seat (331) and is threadedly connected to the wiring terminal.

13. A method for applying the capacitor combination gate inrush current suppression device according to claim 6 or 7, characterized in that: The closing method is as follows: In the initial state, the circuit breaker (02) is in the open state, and the fast switches (03) installed on the A-phase and C-phase lines are both in the open state; Action conditions: the controller monitors the voltage signal between phase B and phase C in real time through the voltage transformer, and after receiving the closing command, first controls the circuit breaker (02) to complete the closing action, then controls the fast switch (03) on the phase C line to complete the closing action, and finally controls the fast switch (03) on the phase A line to complete the closing action; When the circuit breaker (02) is closed, the inrush current and overvoltage of the circuit where the fast switch (03) is located are suppressed by the phase-controlled suppression unit (100) connected in parallel with the fast switch (03).

14. A method for applying the capacitor combination gate inrush current suppression device according to claim 6 or 7, characterized in that: The specific opening method is as follows: In the initial state, the circuit breaker (02) is in the closed state, and the fast switches (03) installed on the A-phase and C-phase lines are both in the closed state; Action conditions: the controller monitors the voltage signal between phase B and phase C in real time through the voltage transformer, and after receiving the opening command, first controls the fast switches (03) on the phase A and phase C lines to complete the opening action, and then controls the circuit breaker (02) to complete the opening action; When the circuit breaker (02) and the fast switch (03) are opened, the inrush current and overvoltage of the circuit where the fast switch (03) is located are suppressed by the phase-controlled suppression unit (100) connected in parallel to the fast switch (03).

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