Inductive phase control device and surge suppression equipment for capacitor combination gate surge control

Abstract

The present invention relates to an inductive phase-controlled device and surge suppression equipment for capacitor combination gate surge control of power supply and distribution circuit devices. The phase-controlled device includes a cylindrical shell, a silicon stack, an energy absorption component, an auxiliary module and a wiring harness, and the silicon stack, the energy absorption component, the auxiliary module and the wiring harness are all installed in the cylindrical shell. The phase-controlled device in the capacitor combination gate surge suppression equipment is provided with a CT power supply module, a heat dissipation module, an air duct and a wiring hub, so that the phase-controlled device can respond quickly according to the current increased when surge current and overvoltage occur, actively cool down, and reduce the time the phase-controlled device is in a high temperature state, thereby delaying the aging of the phase-controlled device and the process of insulation performance degradation, which has a positive effect on extending the service life of the phase-controlled device.

Description

Technical Field

[0001] The present invention relates to a circuit device for power supply and distribution, and in particular to an inductive phase control device and surge suppression equipment for capacitor combination gate surge control in power supply and distribution networks. Background Art

[0002] In the power distribution network, in order to compensate for the capacitive charging current of the line, maintain the system voltage and ensure the reliable operation of the line, a parallel capacitor bank is generally used to solve the problem. However, at the moment of closing the capacitor bank, a closing surge current will be generated to impact the capacitor bank, and the larger the capacity of the capacitor bank, the greater the closing surge current will be.

[0003] In order to control the closing inrush current generated when the reactive power compensation capacitor bank is put into operation in the distribution network system, a closing inrush current suppression device can be installed on the incoming line side of the capacitor bank to control the switching of the capacitor bank in the distribution network system. The closing inrush current device includes a phase-controlled switch for switching control and a phase-controlled device for inrush current suppression.

[0004] Among them, the phase control device is composed of a diode group and an energy absorption component. The energy absorption component is used to absorb surge current. Since it needs to exit the distribution network system in time after absorbing the surge current to avoid becoming a burden on the distribution network system, the energy absorption component usually uses a varistor with nonlinear volt-ampere characteristics. That is, under normal conditions, the voltage across the energy absorption component is below its threshold, and the current of the distribution network system does not pass through the energy absorption component, so that the energy absorption component does not consume the current in the distribution network system; when surge current occurs, the voltage across the energy absorption component increases sharply. After the voltage exceeds its threshold, the energy absorption component is turned on and a large current surges, so that the energy absorption component suppresses the surge current by absorbing the inrush current.

[0005] At present, the current absorbed by the energy absorption component will be converted into heat, causing the internal temperature of the phase control device to rise. Therefore, in applications where large-capacity capacitor banks need to be put into operation in the distribution network system, the following problems exist:

[0006] 1. The operation volume of power equipment of end users in the distribution network system changes regularly, which requires the capacitor bank for reactive power compensation in the distribution network system to be switched on and off accordingly. The inrush current and overvoltage generated by the frequent switching actions will cause the phase control device to frequently enter a high temperature state, thereby accelerating the aging of the phase control device and reducing its insulation performance.

[0007] Second, the energy absorption effect of the energy absorption component of the aging phase control device becomes poor, which is not conducive to the rapid suppression of the surge current;

[0008] 3. An aged phase-controlled device has a risk of breakdown when a large current flows through it. Summary of the invention

[0009] In order to solve the problem mentioned in the above background technology that the phase-controlled components frequently enter a high temperature state, resulting in self-aging and degradation of insulation performance, the present invention provides the following technical solution.

[0010] An inductive phase control device for capacitor combination gate surge control comprises a cylindrical shell, a silicon stack, an energy absorbing component, an auxiliary module and a wiring harness, wherein the silicon stack, the energy absorbing component, the auxiliary module and the wiring harness are all installed in the cylindrical shell.

[0011] Wherein: the cylinder wall of the cylinder shell is provided with an air duct for ventilation. The silicon stack is connected in parallel with the energy absorption component. The auxiliary module includes a heat dissipation module capable of accelerating the cooling inside the phase control device and a CT power supply module capable of obtaining electrical energy through induction current and supplying power to the heat dissipation module. The wiring harness includes a collection plug placed in the inner hole of the CT power supply module for power supply.

[0012] Furthermore, the energy absorption component is formed by stacking a plurality of annular varistor valve sheets, and the inner holes of the varistor valve sheets together constitute a containing space for storing the silicon stack.

[0013] Furthermore, the end surfaces at both ends of the silicon stack are provided with wiring structures.

[0014] Furthermore, the cylinder shell includes an outer cylinder, a bottom cover, a top cover, an inner cylinder and a dust filter.

[0015] Wherein: the bottom cover is installed at the bottom end of the outer cylinder, the top cover is installed at the top end of the outer cylinder, the inner cylinder is installed in the cylinder cavity of the outer cylinder, and the dust filter is installed on the outer cylinder wall of the outer cylinder.

[0016] Furthermore, the outer cylinder is an insulator.

[0017] Wherein: both ends of the barrel body of the outer barrel are provided with barrel openings, and the outer peripheral sides of the barrel openings at both ends are provided with annular grooves for installing dust filters; and the inner peripheral sides of the barrel openings at both ends are provided with through openings connected with the annular grooves.

[0018] Furthermore, the bottom cover is a conductor.

[0019] The bottom cover is installed at the bottom end of the outer tube. The inner cover surface of the bottom cover is provided with a wiring position connected to the wiring structure provided at the bottom end of the silicon stack, and the inner cover surface of the bottom cover is attached to the bottom end surface of the energy absorption component.

[0020] Furthermore, the top cover is a conductor.

[0021] Wherein: the top cover is installed at the top end of the outer tube. The inner cover surface of the top cover is provided with a wiring position for connecting the line collection bolt and an installation position for installing the CT power supply module.

[0022] Furthermore, the inner cylinder is an insulating heat conductor.

[0023] Wherein: the inner tube is installed at the outer tube cavity. The cylinder body of the inner tube is divided into two layers, the inner and outer layers, with a sandwich cavity between the two layers, and the sandwich cavity is provided with reinforcing ribs connecting the inner and outer layers, and the reinforcing ribs divide the sandwich cavity into a number of air ducts distributed around the outer side of the inner layer. The outer layer of the cylinder body of the inner tube is a single-mouth cylinder body, and its cylinder side wall is attached to the outer cylinder cavity wall; its cylinder mouth is adjacent to the opening provided at the bottom end of the outer tube, so that the bottom end of the air duct is connected to the opening provided at the bottom end of the outer tube; a through-hole-shaped negative pressure port is opened at the bottom of the cylinder, and the cylinder bottom is adjacent to the opening provided at the top end of the outer cylinder, so that the negative pressure port is connected to the opening provided at the top end of the outer cylinder. The inner layer of the cylinder body of the inner tube is a single-mouth cylinder body, and its cylinder cavity side wall is attached to the outer wall of the energy absorption component; its cylinder mouth is in contact with the inner cover surface of the bottom cover.

[0024] Furthermore, the heat dissipation module is a heat dissipation fan, and the induction current of the CT power taking module is input to the heat dissipation module.

[0025] Wherein: the heat dissipation module is installed at the negative pressure port. The CT power supply module is installed at the inner cover surface of the top cover.

[0026] Furthermore, the line collection plug is a conductor.

[0027] Among them: one end of the wire collection bolt is connected to the top cover, and the other end is connected to wire 1 and wire 2, and wire 1 and wire 2 both penetrate the bottom of the inner and outer layers of the inner cylinder and are respectively connected to the wiring structure set at the top of the silicon stack and the top surface of the energy absorption component.

[0028] A capacitor combination gate surge suppression device is located at the incoming line side of a capacitor bank and comprises a voltage transformer, a current sensor, a three-phase circuit breaker, a fast switch, a phase control device and a controller.

[0029] Wherein: the voltage transformer is connected between the B-phase and C-phase lines on the incoming line side of the three-phase circuit breaker. The current sensor is arranged on the three-phase lines of A-phase, B-phase and C-phase. The three sealed poles of the three-phase circuit breaker are respectively connected in series in the three-phase lines of A-phase, B-phase and C-phase on the incoming line side of the capacitor group. The fast switch is respectively connected in series in the lines on the outgoing line side of A-phase and C-phase in the three-phase circuit breaker. The phase control device is an inductive phase control device for surge control of the above-mentioned middle container combination gate, and the outer cover surface of the bottom cover and the outer cover surface of the top cover in the phase control device are both provided with mounting positions, and the phase control device is respectively installed on the busbar connected to the incoming and outgoing lines of the fast switch through the mounting positions provided by the outer cover surface of the bottom cover and the outer cover surface of the top cover, so that the phase control component is connected in parallel with the fast switch. 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 three-phase circuit breaker and the fast switch to perform closing and opening operations.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. Install the capacitor combination gate inrush current suppression device on the incoming line side of the capacitor bank used for reactive power compensation in the distribution network, and then use the coordination of the three-phase circuit breaker and the fast switch to control the switching of the capacitor bank in the distribution network system. That is, through the coordinated application of the three-phase circuit breaker and the fast switch, the capacitor bank can be put into operation in the distribution network system within the preset voltage angle threshold, and can also be withdrawn from the distribution network system within the preset voltage angle threshold.

[0032] 2. When the three-phase circuit breaker and the fast switch are used to control the switching of the capacitor bank in the distribution network system, the silicon stack can suppress the closing inrush current generated by the closing operation of the capacitor bank.

[0033] 3. When the three-phase circuit breaker and the fast switch are used to control the switching of the capacitor bank in the distribution network system, the energy absorption component can suppress the opening overvoltage caused by the opening operation of the capacitor bank.

[0034] 4. The phase-controlled device in the capacitor combination gate surge suppression equipment is equipped with a CT power supply module, a heat dissipation module, an air duct and a line collection plug, so that the phase-controlled device can quickly respond to the increased current when surge current and overvoltage occur, actively cool down, and reduce the time the phase-controlled device is in a high temperature state, thereby delaying the aging of the phase-controlled device and the degradation of its insulation performance, which has a positive effect on extending the service life of the phase-controlled device.

[0035] 5. The responsive active cooling of the phase-controlled device prolongs the service life of the energy-absorbing component by delaying its aging process. That is, by reducing the time the energy-absorbing component is in a high temperature state, the energy-absorbing effect of the energy-absorbing component is maintained, thereby providing a guarantee for rapid suppression of surge current.

[0036] 6. Responsive active cooling of the phase-controlled device can extend its service life by delaying the degradation of its insulation performance. That is, by reducing the time the phase-controlled device is in a high temperature state to avoid the degree of degradation of its insulation performance, the risk of the phase-controlled device being broken down by large currents caused by inrush current and overvoltage due to degradation of insulation performance is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is the wiring diagram of the closing inrush current suppression device;

[0038] Figure 2 This is the front view of the closing inrush current suppression device cabinet;

[0039] Figure 3 This is the left side view inside the closing inrush current suppression equipment cabinet;

[0040] Figure 4 is a wiring diagram of the phase control device in the present invention;

[0041] Figure 5 It is a front view of the phase control device in the present invention;

[0042] Figure 6 is a three-dimensional cross-sectional view of the phase-controlled device of the present invention;

[0043] Figure 7 is a three-dimensional cross-sectional view of the cylinder shell in the present invention;

[0044] Figure 8 The structure of the outer cylinder in the present invention is schematically shown in FIG. Figure 1 ;

[0045] Fig. 9 The structure of the outer cylinder in the present invention is schematically shown in FIG. Figure 2 ;

[0046] Fig.10 The structure of the bottom cover of the present invention is shown in FIG. Figure 1 ;

[0047] Fig.11 The structure of the bottom cover of the present invention is shown in FIG. Figure 2 ;

[0048] Fig.12 The structure of the top cover in the present invention is schematically shown in FIG. Figure 1 ;

[0049] Fig.13 The structure of the top cover of the present invention is shown in FIG. Figure 2 ;

[0050] Fig.14 The structure of the inner cylinder in the present invention is schematically shown. Figure 1 ;

[0051] Fig.15 The structure of the inner cylinder in the present invention is schematically shown. Figure 2 ;

[0052] Fig.16 The structure of the silicon stack in the present invention is shown in FIG. Figure 1 ;

[0053] Fig.17 The structure of the silicon stack in the present invention is shown in FIG. Figure 2 ;

[0054] Fig.18 It is a schematic diagram of the monolithic structure of the energy absorbing component in the present invention;

[0055] Fig.19 It is a structural schematic diagram of the auxiliary module in the present invention;

[0056] Fig. 20 It is a schematic diagram of the structure of the wiring harness in the present invention;

[0057] Fig.21It is a schematic structural diagram of the line collection plug in the present invention.

[0058] In the accompanying drawings, the names of the components represented by the reference numerals are listed as follows:

[0059] 01-current sensor, 02-three-phase circuit breaker, 03-fast switch, 04-phase control device;

[0060] 100-cylinder shell, 200-silicon stack, 300-energy absorption component, 400-auxiliary module, 500-wiring harness;

[0061] 110-outer cylinder, 120-bottom cover, 130-top cover, 140-inner cylinder, 150-dust filter, 001-negative pressure port, 002-air duct;

[0062] 410- heat dissipation module, 420- CT power supply module;

[0063] 510-wire hub, 520-wire one, 530-wire two. DETAILED DESCRIPTION

[0064] 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.

[0065] See also Figure 4-Figure 6 The present invention provides an inductive phase control device 04 for capacitor combination gate inrush current management, the phase control device 04 comprises a cylindrical shell 100, a silicon stack 200, an energy absorption component 300, an auxiliary module 400 and a wiring harness 500. The packaging scheme of the phase control device 04 is that the silicon stack 200, the energy absorption component 300, the auxiliary module 400 and the wiring harness 500 are all installed in the cylindrical shell 100.

[0066] Specifically:

[0067] See also Figure 7 , the figure shows a three-dimensional cross-sectional structure of the cartridge shell 100.

[0068] Preferably, the cartridge case 100 comprises an outer cartridge 110, a bottom cover 120, a top cover 130, an inner cartridge 140 and a dust filter 150. The bottom cover 120 is mounted on the bottom end of the outer cartridge 110, the top cover 130 is mounted on the top end of the outer cartridge 110, the inner cartridge 140 is mounted on the cartridge cavity of the outer cartridge 110, and the dust filter 150 is mounted on the outer cartridge wall of the outer cartridge 110.

[0069] See also Figure 8 and Fig. 9 , the figure shows the three-dimensional structure of the outer cylinder 110.

[0070] Preferably, the outer cylinder 110 is an insulator so that the electric energy outside the outer cylinder 110 will not interfere with the components inside the cylinder. The outer cylinder 110 has openings at both ends of the cylinder body, and annular grooves are provided on the outer circumference of the openings at both ends of the outer cylinder 110, and the groove cavity of the annular groove is used to install the dust filter 150; a plurality of through openings are provided on the inner circumference of the openings at both ends of the outer cylinder 110 opposite to the annular grooves, and these through openings are connected to the corresponding annular grooves.

[0071] See also Fig.10 and Fig.11 , the figure shows the three-dimensional structure of the bottom cover 120.

[0072] Preferably, the bottom cover 120 is a conductor, and the silicon stack 200 and the energy absorption assembly 300 are both connected to the external circuit through the bottom cover 120. The bottom cover 120 is installed at the bottom end of the outer tube 110, and the bottom end of the outer tube 110 is sealed, so that the bottom cover 120 is fixedly packaged at the bottom end of the outer tube 110. The inner cover surface of the bottom cover 120 is provided with a wiring position, which is used to connect the wiring structure provided at the bottom end of the silicon stack 200, and the inner cover surface of the bottom cover 120 is in contact with the bottom end surface of the energy absorption assembly 300.

[0073] See also Fig.12 and Fig.13 , the figure shows the three-dimensional structure of the top cover 130.

[0074] Preferably, the top cover 130 is a conductor, and the silicon stack 200 and the energy absorption assembly 300 are both connected to the external circuit through the top cover 130. The top cover 130 is installed at the top end of the outer tube 110, and the top end of the outer tube 110 is sealed, so that the top cover 130 is fixedly packaged at the top end of the outer tube 110. The inner cover surface of the top cover 130 is provided with a wiring position and an installation position, the wiring position is used to connect the hub 510, and the installation position is used to install the CT power module 420.

[0075] See also Fig.14 and Fig.15 , the figure shows the three-dimensional structure of the inner cylinder 140.

[0076] Preferably, the inner cylinder 140 is an insulating heat conductor so as to participate in the process of heat exchange. The cylinder body of the inner cylinder 140 is divided into two layers, an inner layer and an outer layer, with a cavity between the two layers, and a reinforcing rib connecting the inner layer and the outer layer is provided in the cavity, and the reinforcing rib divides the cavity into a plurality of air ducts 002 distributed around the outer periphery of the inner layer. The outer layer of the cylinder body of the inner cylinder 140 is a single-mouth cylinder body, and the outer wall of the cylinder body is attached to the cavity wall of the outer cylinder 110; its cylinder mouth is adjacent to the opening provided at the bottom end of the outer cylinder 110, so that the bottom end of the air duct 002 is connected to the opening provided at the bottom end of the outer cylinder 110; a through-hole-shaped negative pressure port 001 is opened at the bottom of the cylinder, and the cylinder bottom is adjacent to the opening provided at the top end of the outer cylinder 110, so that the negative pressure port 001 is connected to the opening provided at the top end of the outer cylinder 110. The inner layer of the inner cylinder 140 is a single-mouth cylinder, and the inner wall of the cylinder cavity is in contact with the outer wall of the energy absorbing component 300 .

[0077] See also Fig.16 and Fig.17 , the figure shows the three-dimensional structure of the silicon stack 200.

[0078] Preferably, the silicon stack 200 is internally composed of a plurality of diodes connected in series in the same direction; and its exterior is an interference-proof insulating shell, and the end faces of both ends of the shell are provided with wiring structures so that the internal series diode circuit can be connected to the outside through the wiring structure.

[0079] See also Fig.18 , the figure shows the three-dimensional structure of a single component unit of the energy absorbing assembly 300.

[0080] Preferably, the energy absorbing assembly 300 is formed by stacking a plurality of annular nonlinear varistor valve sheets, and the annular holes of the varistor valve sheets together constitute an accommodating space for storing the silicon stack 200 .

[0081] See also Fig.19 , the figure shows the three-dimensional structure of the auxiliary module 400.

[0082] Preferably, the auxiliary module 400 includes a heat dissipation module 410 and a CT power supply module 420. The heat dissipation module 410 is installed at the negative pressure port 001 to accelerate the cooling inside the phase control device 04. For example, the heat dissipation module 410 uses a heat dissipation fan to accelerate the flow of gas in the air duct provided by the cylinder shell 100, and the heat dissipation fan adopts stepless speed change, that is, the greater the current received by the heat dissipation fan, the faster the rotor speed therein is, and the faster the heat dissipation speed is. The CT power supply module 420 is installed on the inner cover surface of the top cover 130, and it obtains electrical energy by induction current, and supplies the obtained electrical energy to the heat dissipation module 410.

[0083] See also Fig. 20 and Fig.21, the three-dimensional structure of the wire harness 500 and the three-dimensional structure of the wire collection plug 510 are respectively shown in the figure.

[0084] Preferably, the wiring harness 500 includes a wiring hub 510, a wire 1 520 and a wire 2 530. The wiring hub 510 is a conductor, and is placed in the inner hole of the CT power module 420, so that the CT power module 420 senses the current in the wiring hub 510 and generates an induced current in the CT power module 420, and supplies the generated induced current to the heat dissipation module 410, so that the heat dissipation module 410 is powered and works. In addition, one end of the wiring hub 510 is connected to the wiring position set on the inner cover surface of the top cover 130, and the other end thereof is connected to the wire 1 520 and the wire 2 530, and the wire 1 520 and the wire 2 530 both penetrate the inner and outer layers of the inner tube 140 and are connected to the wiring structure set at the top of the silicon stack 200 and the top surface of the energy absorption component 300 respectively.

[0085] In this technical solution:

[0086] The annular groove and the through opening of the outer cylinder 110, the air duct 002 and the negative pressure port 001 of the inner cylinder 140, these spaces together constitute an air duct that can exchange air inside and outside the phase control device 04, and the heat dissipation module 410 is arranged in the air duct. In this way, through the cooperation of the air duct and the heat dissipation module 410, the phase control device 04 uses the air duct to exchange air inside and outside, thereby accelerating the heat dissipation of the internal heat of the phase control device 04 to the outside.

[0087] The silicon stack 200 and the energy absorbing assembly 300 are connected in parallel to the energy absorbing assembly 300 through wiring with the wiring harness 500 , the top cover 130 and the bottom cover 120 .

[0088] After the voltage is applied to the negative side of the silicon stack 200, the silicon stack 200 can suppress the current. When the voltage on the negative side of the silicon stack 200 rises to the conduction point voltage of the energy absorption component 300, the energy absorption component 300 is turned on, and the energy absorption component 300 shunts the charge accumulated on the negative side of the silicon stack 200, thereby suppressing the overvoltage. During this period, since the collection plug 510 is powered, the CT power module 420 generates an induced current and supplies it to the heat dissipation module 410. Among them, the greater the current flowing through the collection plug 510, the greater the induced current generated by the CT power module 420, and when the induced current reaches the minimum operating current of the heat dissipation module 410, the heat dissipation module 410 starts to work.

[0089] See also Figure 1-Figure 3The present invention provides a capacitor combination gate inrush current suppression device. The device is used in the scheme of reactive power compensation of the distribution network system through the capacitor bank, and plays a role in controlling the inrush current and overvoltage generated when the capacitor bank is switched on and off. The device is usually installed on the incoming line side of the reactive power compensation capacitor bank in the distribution network system, and together with the capacitor bank, it constitutes a part of the reactive power compensation branch. That is, the incoming line side of the device is connected to the distribution network system, and the outgoing line side is connected to the capacitor bank.

[0090] The equipment includes a cabinet and a voltage transformer, a current sensor 01, a three-phase circuit breaker 02, a fast switch 03, a phase control device 04 and a controller installed in the cabinet. In order to save costs, the cabinet can be omitted. 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 to control the three-phase circuit breaker 02 and the fast switch 03 to perform closing and opening operations.

[0091] like Figure 1 As shown in the figure:

[0092] A, B and C represent the A phase line, B phase line and C phase line of the reactive power compensation branch respectively.

[0093] PT represents a voltage transformer connected between the B-phase line and the C-phase line on the incoming line side of the three-phase circuit breaker 02, which is used to monitor the voltage signal of the reactive compensation branch and feed the voltage signal back to the controller.

[0094] CTa, CTb and CTc represent current sensors 01 installed on the A-phase line, the B-phase line and the C-phase line respectively.

[0095] K represents a three-phase circuit breaker 02, and its three switches are connected in series to the A-phase line, the B-phase line and the C-phase line respectively.

[0096] Ka, Kb and Kc represent the fast switches 03 connected in series in the A phase line, B phase line and C phase line of the three-phase circuit breaker 02, respectively, and the incoming lines of the three are in the same direction. Among them, Kb can be omitted to save costs.

[0097] Da, Db and Dc represent the phase control components 04 connected in parallel to Ka, Kb and Kc respectively. In order to save costs, Db can be omitted together with Kb. In addition, the phase control component 04 adopts the above-mentioned capacitor combination gate induction phase control device 04 for inrush current management.

[0098] Cz represents the capacitor bank used for reactive power compensation in the reactive power compensation branch of the distribution network system.

[0099] Specifically:

[0100] The outer cover surface of the bottom cover 120 and the outer cover surface of the top cover 130 are both provided with mounting positions, and the phase control device 04 is installed between the busbars connected to the input and output terminals of the fast switch 03 through the mounting positions provided on the outer cover surfaces of the bottom cover 120 and the top cover 130, so that the phase control component 04 is connected in parallel with the fast switch 03. Among them, the input side of the fast switch 03 on the A-phase line and the C-phase line is in the same direction as the negative side of the silicon stack 200 connected in parallel, and the input side of the fast switch 03 on the B-phase line is in the same direction as the positive side of the silicon stack 200 connected in parallel.

[0101] In this technical solution, when the capacitor bank in the reactive power compensation branch needs to be put into operation in the distribution network system, the logic is as follows:

[0102] i. Initial state: That is, the three-phase circuit breaker 02 and all the fast switches 03 are in the open state.

[0103] ⅱ. The first closing action. That is, the controller monitors the voltage signal of the reactive compensation branch in real time through the voltage transformer. After receiving the closing command, the controller sends a closing command to the three-phase circuit breaker 02 and the fast switch on the B-phase line, commanding the three-phase circuit breaker 02 to complete the closing within the preset closing phase angle range. If a fast switch 03 is set on the B-phase line, the fast switch 03 is also commanded to complete the closing within the preset closing phase angle range; if the fast switch 03 is not set on the B-phase line, the closing command to the fast switch 03 is ignored. During this period, the inrush current generated when the capacitor group is put into operation is suppressed by the phase control device 04.

[0104] iii. Second closing action. That is, after the controller issues a closing command to the three-phase circuit breaker 02, it simultaneously issues commands to the fast switch 03 in the A-phase line and the fast switch 03 in the C-phase line, commanding the two fast switches 03 to complete closing within their respective preset closing phase angle ranges.

[0105] iv. Operational status. That is, the three-phase circuit breaker 02, the fast switches 03 in the A-phase line, the B-phase line and the C-phase line are all in the closed state, and the capacitor bank in the reactive compensation branch is put into operation in the distribution network system for stable operation. If the fast switch 03 is not set on the B-phase line, the situation of the fast switch 03 in the B-phase line is ignored.

[0106] In this technical solution, when it is necessary to withdraw the capacitor bank in the reactive power compensation branch from the distribution network system, the logic is as follows:

[0107] i. Initial state: That is, the three-phase circuit breaker 02 and all the fast switches 03 are in the closed state.

[0108] ii. The first opening action. That is, the controller monitors the voltage signal of the reactive compensation branch in real time through the voltage transformer. After receiving the opening command, the controller sends an opening command to the fast switch 03 in the A phase line and the fast switch 03 in the C phase line, instructing the two fast switches 03 to complete the opening within the preset opening phase angle range.

[0109] ⅲ. Second opening action. That is, after the controller issues an opening command to the fast switch 03 in the A-phase line and the fast switch 03 in the C-phase line, it simultaneously issues a command to the three-phase circuit breaker 02, commanding the three-phase circuit breaker 02 to complete the opening 10ms after the fast switch 03 in the A-phase line and the fast switch 03 in the C-phase line complete the opening. If a fast switch 03 is provided on the B-phase line, the fast switch 03 is also commanded to complete the opening within the preset closing phase angle range together with the three-phase circuit breaker 02; if the fast switch 03 is not provided on the B-phase line, the opening command to the fast switch 03 is ignored. During this period, the opening overvoltage is suppressed by the phase control device 04.

[0110] iv. Exit state: That is, the three-phase circuit breaker 02 and all the fast switches 03 are in the open state, and the capacitor bank in the reactive power compensation branch is completely withdrawn from the distribution network system.

[0111] In the present technical scheme, when the original reactive power compensation branch in the distribution network system does not have this device and needs to be installed with this device, if there is already a voltage transformer between the B-phase line and the C-phase line in the original reactive power compensation branch, and after the installation of this device, the voltage transformer can still be used, in order to save the cost of installing this device, the voltage transformer of this device can be cancelled, and the device without a voltage transformer can be installed with the voltage transformer of the original reactive power compensation branch. That is, the voltage transformer of the reactive power compensation branch is between the A-phase line and the B-phase line on the incoming line side outside the cabinet of this device. Similarly, if there are already current sensors 01 in the A-phase line, the B-phase line and the C-phase line in the original reactive power compensation branch, and after the installation of this device, the current sensor 01 can still be used, in order to save the cost of installing this device, the current sensor 01 of this device can be cancelled, and the current sensor 01 of the original reactive power compensation branch can continue to be used.

[0112] 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. An inductive phase control device (04) for surge control of a capacitor combination gate, comprising a cylindrical shell (100), a silicon stack (200) and an energy absorption component (300), characterized in that: The phase control device (04) further comprises an auxiliary module (400) and a wiring harness (500), and the silicon stack (200), the energy absorption component (300), the auxiliary module (400) and the wiring harness (500) are all installed in the cylindrical shell (100); The cylinder shell (100) comprises an outer cylinder (110) and an inner cylinder (140); both ends of the cylinder body of the outer cylinder (110) are provided with cylinder openings, and the outer peripheral sides of the cylinder openings at both ends are provided with annular grooves, and the inner peripheral sides of the cylinder openings at both ends are provided with through openings connected to the annular grooves; the cylinder body of the inner cylinder (140) is divided into an inner layer and an outer layer, and a sandwich cavity is left between the two layers, and a reinforcing rib connecting the inner and outer layers is provided in the sandwich cavity, and the reinforcing rib divides the sandwich cavity into a plurality of air ducts (002) distributed around the outer side of the inner layer; the outer layer of the cylinder body of the inner cylinder (140) is a single-cylinder-opening cylinder body, The side wall of the cylinder body is fitted to the cavity wall of the outer cylinder (110), and the cylinder mouth is adjacent to the opening provided at the bottom end of the outer cylinder (110), so that the bottom end of the air duct (002) is connected to the opening provided at the bottom end of the outer cylinder (110). A through-hole-shaped negative pressure port (001) is opened at the bottom of the cylinder, and the cylinder bottom is adjacent to the opening provided at the top end of the outer cylinder (110), so that the negative pressure port (001) is connected to the opening provided at the top end of the outer cylinder (110); the inner layer of the cylinder of the inner cylinder (140) is a single-cylinder-mouth cylinder body, and the side wall of the cylinder cavity is fitted to the outer wall of the energy absorption component (300); The silicon stack (200) is connected in parallel with the energy absorbing component (300); The auxiliary module (400) comprises a heat dissipation module (410) capable of accelerating the internal temperature reduction of the phase control device (04) and a CT power extraction module (420) capable of obtaining electric energy through induction current and supplying power to the heat dissipation module (410); The wiring harness (500) comprises a wiring hub (510) placed in an inner hole of the CT power supply module (420) to facilitate power supply.

2. The inductive phase control device (04) for inrush current management of capacitor combination gate according to claim 1, characterized in that: The energy absorption component (300) is formed by stacking a plurality of annular varistor valve sheets, and the inner holes of the varistor valve sheets together form a storage space for storing the silicon stack (200).

3. The inductive phase control device for inrush current management of capacitor combination gate according to claim 2, characterized in that: The end surfaces at both ends of the silicon stack (200) are provided with wiring structures.

4. The inductive phase control device for inrush current management of capacitor combination gate according to claim 3, characterized in that: The cartridge case (100) further comprises a bottom cover (120), a top cover (130) and a dust filter (150); The bottom cover (120) is installed at the bottom end of the outer cylinder (110); The top cover (130) is installed on the top end of the outer cylinder (110); The inner cylinder (140) is installed in the cylinder cavity of the outer cylinder (110); The dust filter (150) is installed in the annular groove provided in the outer cylinder (110).

5. The inductive phase control device for inrush current management of capacitor combination gate according to claim 1, characterized in that: The outer cylinder (110) is an insulator.

6. The inductive phase control device for surge control of capacitor combination gate according to claim 4, characterized in that: The bottom cover (120) is a conductor; The bottom cover (120) is mounted on the bottom end of the outer cylinder (110); The inner cover surface of the bottom cover (120) is provided with a wiring position connected to a wiring structure provided at the bottom end of the silicon stack (200), and the inner cover surface of the bottom cover (120) is attached to the bottom end surface of the energy absorption component (300).

7. The inductive phase control device for surge current management of capacitor combination gate according to claim 4, characterized in that: The top cover (130) is a conductor; The top cover (130) is mounted on the top end opening of the outer cylinder (110); The inner cover surface of the top cover (130) is provided with a wiring position for connecting the line collection plug (510) and an installation position for installing the CT power supply module (420).

8. The inductive phase control device for surge current management of capacitor combination gate according to claim 1, characterized in that: The inner cylinder (140) is an insulating heat conductor.

9. The inductive phase control device for surge current management of capacitor combination gate according to claim 4, characterized in that: The heat dissipation module (410) is a heat dissipation fan; The heat dissipation module (410) is installed at the negative pressure port (001); The CT power extraction module (420) is installed on the inner cover surface of the top cover (130).

10. The inductive phase control device for surge current management of capacitor combination gate according to claim 4, characterized in that: The line collection plug (510) is a conductor; One end of the wiring hub (510) is connected to the top cover (130), and the other end thereof is connected to the first wire (520) and the second wire (530), and both the first wire (520) and the second wire (530) penetrate the inner and outer bottoms of the inner tube (140) and are connected to the wiring structure provided at the top of the silicon stack (200) and the top surface of the energy absorption component (300) respectively.

11. A capacitor combination inrush current suppression device, located at the incoming line side of a capacitor bank, comprising a three-phase circuit breaker (02) for switching the capacitor bank, a voltage transformer connected between the B-phase and C-phase lines on the incoming line side of the three-phase circuit breaker (02), a current sensor (01) arranged on the A-phase, B-phase and C-phase lines, a fast switch (03) installed on the A-phase and C-phase lines on the outgoing line side of the three-phase circuit breaker (02), and a controller for receiving, analyzing and processing a voltage signal of the voltage transformer and a current signal of the current sensor (01) to control the three-phase circuit breaker (02) and the fast switch (03) to perform closing and opening operations, characterized in that: It also comprises a phase control device (04) as described in any one of claims 4 to 10 above; The outer cover surface of the bottom cover (120) and the outer cover surface of the top cover (130) are both provided with mounting positions, and the phase control device (04) is respectively installed on the busbars connected to the input and output ends of the fast switch (03) through the mounting positions provided on the outer cover surface of the bottom cover (120) and the outer cover surface of the top cover (130), so that the phase control component (04) is connected in parallel with the fast switch (03).

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