Active arc extinguishing device
By coordinating the pulse generation, voltage arc extinguishing, and current compensation modules of the active arc extinguishing device, the problem of incomplete arc extinguishing is solved, achieving rapid and complete arc extinguishing and reducing the safety risks of the power distribution system.
Patent Information
- Application Number
- CN202423289098.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2034-12-30
AI Technical Summary
Existing arc suppression devices are ineffective in suppressing arcs during single-phase grounding faults in power distribution systems, posing risks such as arc reignition, electric shock, and fire.
Design an active arc extinguishing device, comprising a pulse generation module, a voltage arc extinguishing module, a current compensation module, and an arc extinguishing controller. By outputting current pulses, reducing fault voltage, and compensating current, the control module works in concert to achieve rapid and complete arc extinguishing.
It effectively and quickly extinguishes electric arcs, prevents accidents from worsening, ensures complete arc extinguishing, reduces the voltage of the faulty phase to 0V, prevents arc reignition, and improves the safety of the power distribution system.
Smart Images
Figure CN223871361U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of power distribution system protection technology, and in particular to an active arc suppression device. Background Technology
[0002] In related technologies, some arc-suppression devices, when a single-phase ground fault occurs in a power distribution system, have poor arc-suppression effects, posing a risk of arc reignition or even incomplete arc suppression, increasing the risk of electric shock, fire, and other accidents to personnel. Utility Model Content
[0003] The technical problem to be solved by this utility model is to provide an active arc extinguishing device.
[0004] The technical solution adopted by this utility model to solve its technical problem is: to construct an active arc-extinguishing device, comprising:
[0005] A pulse generation module connected to the neutral point of the power distribution system to output an arc-extinguishing current pulse to the neutral point when a ground fault occurs in the power distribution system;
[0006] A voltage arc suppression module connected to the neutral point is used to reduce the fault voltage when a ground fault occurs in the power distribution system.
[0007] A current compensation module connected to the neutral point is used to output a compensation current to the neutral point to reduce the voltage of the faulted phase when a ground fault occurs in the power distribution system; and
[0008] An arc suppression controller, connected to the pulse generation module, voltage arc suppression module, and current compensation module, is used to control the operation of the pulse generation module, voltage arc suppression module, and current compensation module when a ground fault occurs in the power distribution system.
[0009] Preferably, the active arc-extinguishing device further includes:
[0010] A fault current compensation module connected to the neutral point and arc suppression controller, capable of outputting an inductor current that reduces the capacitive current at the fault point to the neutral point when a ground fault occurs in the power distribution system; and / or
[0011] A zero-sequence current generation module, connected to the neutral point and arc suppression controller, is used to output a wideband zero-sequence current to the neutral point when a ground fault occurs in the power distribution system. This zero-sequence current can suppress the neutral point voltage.
[0012] Preferably, the fault current compensation module includes an arc suppression coil connected between the neutral point and the arc suppression controller;
[0013] The zero-sequence current generation module includes an inverter connected between the neutral point and the arc suppression controller.
[0014] Preferably, the pulse generation module includes a step-up transformer connected between the neutral point and the arc suppression controller;
[0015] The voltage arc suppression module includes an arc suppression transformer connected between the neutral point and the arc suppression controller;
[0016] The current compensation module includes an H-bridge converter connected between the neutral point and the arc suppression controller.
[0017] Preferably, the step-up transformer is model SFS9-DSX; and / or
[0018] The arc-suppression transformer is model DKSCB13-50; and / or
[0019] The H-bridge converter is model TPCA8062-H; and / or
[0020] The arc suppression coil is of model I TRT-PXB, XHK-Ⅱ, AL-XHBZ or GX-PXH;
[0021] The inverter model is SG125HV-185KTL.
[0022] Preferably, the arc suppression controller includes:
[0023] The main control module is connected to the fault current compensation module;
[0024] A power control module connected between the main control module and the current compensation module;
[0025] A tap changer module connected between the main control module and the voltage arc suppression module; and
[0026] A transformer control module connected to the main control module, pulse generation module, and zero-sequence current generation module.
[0027] Preferably, the main control module includes:
[0028] An FPGA, comprising a signal filtering circuit for connecting to a monitoring system of the power distribution system to obtain operating parameters of the power distribution system and filtering the operating parameters; and
[0029] A processing circuit connected to the FPGA, fault current compensation module, power control module, tap changer module and transformer control module, for receiving the filtered operating parameters and controlling the operation of the fault current compensation module, power control module, tap changer module and transformer control module.
[0030] Preferably, the processing circuit includes a digital signal processor of model DSP56301.
[0031] Preferably, the power control module includes an intelligent power module connected between the main control module and the current compensation module;
[0032] The tap changer module includes a non-excitation tap changer connected between the main control module and the voltage arc suppression module;
[0033] The transformer control module includes an inverter controller connected to the main control module, the pulse generation module, and the zero-sequence current generation module.
[0034] Preferably, the intelligent power module is model 6MBP15RY060; and / or
[0035] The model of the non-energized tap changer is WRTYⅢ250 / 10-3X3; and / or
[0036] The inverter controller model is YJ-15-46TD.
[0037] The technical solution of this utility model can output a current pulse through a pulse generation module when a ground fault occurs in the power distribution system, so as to achieve a rapid arc extinguishing effect and avoid the arc from causing the accident to worsen. It also suppresses the fault voltage to below the arc reignition voltage through a voltage arc extinguishing module, fundamentally destroying the conditions for the fault arc to reignite. Finally, it outputs a compensation current through a current compensation module to reduce the fault phase voltage to or equal to 0V, thereby ensuring complete arc extinguishing and avoiding the occurrence of incomplete arc extinguishing. Attached Figure Description
[0038] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:
[0039] Figure 1 This is a schematic diagram of the active arc-extinguishing device in the first embodiment provided by this utility model;
[0040] Figure 2 This is a schematic diagram of the active arc-extinguishing device in the second embodiment provided by this utility model. Detailed Implementation
[0041] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.
[0042] In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "front," "rear," "up," "down," "left," "right," "longitudinal," "horizontal," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the device or component referred to must have a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0043] Figure 1 This is a schematic diagram of the active arc-extinguishing device in the first embodiment of this utility model. This active arc-extinguishing device is used in a power distribution system and can effectively extinguish arcs when a ground fault occurs in the power distribution system. It can also disrupt the conditions for arc reignition, thereby achieving complete arc extinguishing. In addition, the power distribution system includes a neutral point, which is the common reference point in the three-phase AC power output of the power distribution system, typically corresponding to the neutral point of the grounding transformer of the power distribution system.
[0044] like Figure 1 As shown, the active arc suppression device may include a pulse generation module 1, a voltage arc suppression module 2, a current compensation module 3, and an arc suppression controller 4.
[0045] like Figure 1 As shown, pulse generation module 1 is connected to the neutral point of the power distribution system. Pulse generation module 1 is used to output a current pulse capable of extinguishing the arc to the neutral point when a ground fault occurs in the power distribution system. Specifically, when a ground fault occurs in the power distribution system, an electric arc will be generated. At this time, pulse generation module 1 will operate to generate a current pulse with a high amplitude. This current pulse will enter the power distribution system through the neutral point, which can absorb the energy of the arc and achieve the effect of quickly extinguishing the arc, so as to minimize the risk of the arc causing the accident to worsen.
[0046] In some embodiments, the pulse generation module 1 may include a step-up transformer connected between the neutral point and the arc suppression controller 4. When a ground fault occurs in the power distribution system, the arc suppression controller 4 controls the step-up transformer to operate, causing its coil to output a high-voltage pulse, thereby generating the current pulse.
[0047] In some embodiments, the step-up transformer may be a transformer of model SFS9-DSX.
[0048] like Figure 1As shown, the voltage arc suppression module 2 is connected to the neutral point. The voltage arc suppression module 2 is used to reduce the fault voltage when a ground fault occurs in the power distribution system. Specifically, when a ground fault occurs in the power distribution system (such as an arc ground fault), an arc is generated because the pressure difference between the fault point and the ground reaches the ionized air (i.e., the fault voltage). If the fault voltage is not suppressed, there is a significant risk of arc reignition even after the arc is suppressed. When the voltage arc suppression module 2 is working, it can effectively reduce the fault voltage, suppressing it below the arc reignition voltage, thus fundamentally destroying the conditions for the fault arc to reignite.
[0049] In some embodiments, the voltage arc suppression module 2 may include an arc suppression transformer connected between the neutral point and the arc suppression controller 4. When a ground fault occurs in the power distribution system, the arc suppression controller 4 controls the arc suppression transformer to operate, thereby regulating the ground voltage (i.e., the neutral point voltage) and actively reducing the voltage of the ground fault phase to below the arc reignition voltage. Since the generation of an arc is related to factors such as humidity, the arc reignition voltage can be adaptively set according to the actual conditions of the power distribution system.
[0050] In some embodiments, the arc-suppression transformer may be a transformer of model DKSCB13-50.
[0051] like Figure 1 As shown, the current compensation module 3 is connected to the neutral point. The current compensation module 3 is used to output a compensation current sufficient to compensate for the fault phase voltage to the neutral point when a ground fault occurs in the power distribution system. Specifically, when a ground fault occurs in the power distribution system, the current compensation module 3 operates to output a compensation current to the neutral point. This compensation current compensates for the total fault current, forcing the fault phase voltage (i.e., the voltage of the phase line where the ground fault occurred) to decrease to or equal to 0V, thereby ensuring complete arc suppression and preventing incomplete arc suppression.
[0052] In some embodiments, the current compensation module 3 includes an H-bridge converter connected between the neutral point and the arc suppression controller 4. When a ground fault occurs in the power distribution system, the arc suppression controller 4 controls the H-bridge converter to operate, and the H-bridge converter generates a compensation current and injects the compensation current into the neutral point to achieve complete arc suppression.
[0053] In some embodiments, the H-bridge converter may be an H-bridge converter of model TPCA8062-H.
[0054] like Figure 1 As shown, the arc suppression controller 4 is connected to the pulse generation module 1, the voltage arc suppression module 2, and the current compensation module 3. The arc suppression controller 4 is used to control the pulse generation module 1, the voltage arc suppression module 2, and the current compensation module 3 to work when a ground fault occurs in the power distribution system.
[0055] Figure 2 This is a schematic diagram of the active arc-extinguishing device in the second embodiment provided by this utility model. Figure 2 As shown, the active arc suppression device may include a pulse generation module 1, a voltage arc suppression module 2, a current compensation module 3, an arc suppression controller 4, a fault current compensation module 5, and a zero-sequence current generation module 6. It should be noted that the main difference between the second embodiment and the first embodiment is the addition of the fault current compensation module 5 and the zero-sequence current generation module 6 to further improve the arc suppression effect and ensure complete arc suppression. Furthermore, the specific embodiments and working principles of the pulse generation module 1, the voltage arc suppression module 2, and the current compensation module 3 can be found in the first embodiment. Accordingly, in the second embodiment, the arc suppression controller 4 is also used to control the operation of the fault current compensation module 5 and the zero-sequence current generation module 6 when a ground fault occurs in the power distribution system.
[0056] like Figure 2 As shown, the fault current compensation module 5 is connected to the neutral point and the arc suppression controller 4. The fault current compensation module 5 is used to output an inductor current to the neutral point when a ground fault occurs in the power distribution system, which can reduce the capacitive current at the fault point. Specifically, when a ground fault occurs in the power distribution system, an arc is generated at the fault point, resulting in a relatively large capacitive current (i.e., the fault point capacitive current). At this time, the fault current compensation module 5 works and outputs an inductor current to the neutral point. The inductor current and the fault point capacitive current compensate for each other and cancel each other out, effectively reducing the fault point capacitive current and effectively reducing the overvoltage of the arc, thereby suppressing the generation of the arc.
[0057] In some embodiments, the fault current compensation module 5 may include an arc suppression coil connected between the neutral point and the arc suppression controller 4. When a ground fault occurs in the power distribution system, the arc suppression controller 4 controls the arc suppression coil to operate, and the arc suppression coil generates an inductive current that can compensate for the capacitive current at the fault point, and injects the inductive current into the neutral point to achieve the purpose of suppressing arc generation.
[0058] In some embodiments, the arc suppression coil may be an arc suppression coil of type I TRT-PXB, XHK-Ⅱ, AL-XHBZ or GX-PXH.
[0059] like Figure 2 As shown, the zero-sequence current generation module 6 is connected to the neutral point and the arc suppression controller 4. The zero-sequence current generation module 6 is used to output a broadband zero-sequence current to the neutral point when a ground fault occurs in the power distribution system. This current can suppress the neutral point voltage and the ground fault current. Specifically, when a ground fault occurs in the power distribution system, the zero-sequence current generation module 6 operates to inject a broadband zero-sequence current into the neutral point. This broadband zero-sequence current can suppress the neutral point voltage from approaching or even being equal to 0V, and suppress the ground fault current, thereby improving the arc suppression effect.
[0060] In some embodiments, the zero-sequence current generation module 6 may include an inverter connected between the neutral point and the arc suppression controller 4. When a ground fault occurs in the power distribution system, the arc suppression controller 4 controls the inverter to operate, so that the inverter inputs the broadband zero-sequence current to the neutral point.
[0061] In some embodiments, the inverter may be an inverter with the model number SG125HV-185KTL.
[0062] like Figure 2 As shown, in the second embodiment, the arc suppression controller 4 may include a main control module 41, a power control module 42, a tap changer module 43, and a transformer control module 44.
[0063] The main control module 41 is connected to the fault current compensation module 5, the power control module 42, the tap changer module 43, and the transformer control module 44. Specifically, the main control module 41 is used to control the operation of the fault current compensation module 5, the power control module 42, the tap changer module 43, and the transformer control module 44 when a ground fault occurs in the power distribution system.
[0064] In some embodiments, the main control module 41 may include an FPGA and processing circuitry.
[0065] The FPGA includes a signal filtering circuit, which connects to the monitoring system of the power distribution system to obtain and filter the operating parameters of the power distribution system. It should be noted that the operating parameters include analog data related to the voltage and / or current of the three phase lines of the power distribution system. Since each phase corresponds to a current analog signal and / or a voltage analog signal, and each analog signal is superimposed with interference noise, filtering is required to improve the signal-to-noise ratio (SNR) of the analog signals. Accordingly, the FPGA, as a field-programmable gate array, can implement multiple customized circuits. This embodiment designs a signal filtering circuit using the FPGA, which includes multiple signal filters, each capable of filtering a single analog signal. Understandably, this embodiment fully utilizes the flexibility of the FPGA, facilitating the design of multiple signal filters with satisfactory filtering effects, thus improving the SNR of the operating parameters. The signal filters can be low-pass filters. Of course, the FPGA can also be replaced by multiple existing low-pass filters or low-pass filtering circuits.
[0066] The processing circuit is connected to the FPGA, fault current compensation module 5, power control module 42, tap changer module 43, and transformer control module 44. The processing circuit receives filtered operating parameters and controls the operation of these modules. Specifically, the processing circuit can determine whether a ground fault has occurred in the power distribution system based on the operating parameters by executing a pre-stored algorithm. When a ground fault occurs, it controls the fault current compensation module 5 to operate, controls the current compensation module 3 to operate via the power control module 42, controls the voltage arc suppression module 2 to operate via the tap changer module 43, and controls the pulse generation module 1 and zero-sequence current generation module 6 to operate via the transformer control module 44. It should be noted that the algorithm used by the processing circuit to determine whether a ground fault has occurred in the power distribution system is an existing algorithm; that is, the specific algorithm for determining whether a ground fault has occurred in the power distribution system based on three-phase voltage or current can be found in existing technology and will not be elaborated here.
[0067] In some embodiments, the processing circuit may include a digital signal processor (DSP). The DSP is connected to the FPGA, the fault current compensation module 5, the power control module 42, the tap changer module 43, and the transformer control module 44. The DSP is mainly used to execute existing logic algorithms to determine whether a ground fault has occurred in the power distribution system and to control the operation of the arc suppression coil in the fault current compensation module 5. The DSP may be a DSP56301.
[0068] like Figure 2 As shown, the power control module 42 is connected between the main control module 41 and the current compensation module 3, and the power control module 42 is used to control the operation of the current compensation module 3.
[0069] In some embodiments, the power control module 42 may include an intelligent power module connected between the main control module 41 and the current compensation module 3. The intelligent power module drives the H-bridge converter in the current compensation module 3 and controls the magnitude of the compensation current output by the current compensation module 3. The intelligent power module (IPM module) may be a 6MBP15RY060.
[0070] In some embodiments, the processing circuit may also adjust the output level of the H-bridge converter through the power control module 42 according to the operating parameters, and control the magnitude of the compensation current to be within a suitable range, so as to improve the arc suppression effect of the current compensation module 3.
[0071] like Figure 2 As shown, the tap changer module 43 is connected between the main control module 41 and the voltage arc suppression module 2. The tap changer module 43 is used to control the operation of the voltage arc suppression module 2.
[0072] In some embodiments, the tap changer module 43 may include a de-energized tap changer connected between the main control module 41 and the voltage arc suppression module 2. The de-energized tap changer is used to control the operation of the arc suppression transformer in the voltage arc suppression module 2. The de-energized tap changer is model WRTYⅢ250 / 10-3X3.
[0073] In some embodiments, the processing circuit may also adjust the switching coefficient of the arc suppression transformer through the tap changer module 43 according to the operating parameters to ensure that the conditions for the reignition of the fault arc can be destroyed.
[0074] like Figure 2 As shown, the transformer control module 44 is connected to the main control module 41, the pulse generation module 1, and the zero-sequence current generation module 6. The transformer control module 44 is used to control the operation of the pulse generation module 1 and the zero-sequence current generation module 6.
[0075] In some embodiments, the transformer control module 44 may include an inverter controller, which is connected to the main control module 41, the pulse generation module 1, and the zero-sequence current generation module 6. The inverter controller is used to control the step-up transformer in the pulse generation module 1 and the inverter in the zero-sequence current generation module 6. The inverter controller may be of model YJ-15-46TD.
[0076] In some embodiments, the processing circuit also controls the step-up coefficient of the step-up transformer through the inverter controller according to the operating parameters, so as to control the size of the current pulse and improve the rapid arc extinguishing effect. It also controls the switching angle of the inverter through the inverter controller according to the operating parameters, so as to control the size of the wideband zero-sequence current, ensuring that the neutral point voltage is as close to 0V as possible and guaranteeing the arc extinguishing effect.
[0077] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present utility model, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.
Claims
1. An active arc-extinguishing device, characterized in that, include: A pulse generation module (1) is connected to the neutral point of the power distribution system to output an arc-extinguishing current pulse to the neutral point when a ground fault occurs in the power distribution system. A voltage arc suppression module (2) connected to the neutral point for reducing the fault voltage when a ground fault occurs in the power distribution system; A current compensation module (3) connected to the neutral point is used to output a compensation current to the neutral point when a ground fault occurs in the power distribution system, which can reduce the voltage of the fault phase. as well as An arc suppression controller (4) is connected to the pulse generation module (1), voltage arc suppression module (2) and current compensation module (3) to control the operation of the pulse generation module (1), voltage arc suppression module (2) and current compensation module (3) when a ground fault occurs in the power distribution system.
2. The active arc-extinguishing device according to claim 1, characterized in that, Also includes: A fault current compensation module (5) connected to the neutral point and arc suppression controller (4) to output an inductor current capable of reducing the capacitive current at the fault point to the neutral point when a ground fault occurs in the power distribution system; and / or A zero-sequence current generation module (6) is connected to the neutral point and arc suppression controller (4) to output a wideband zero-sequence current to the neutral point when a ground fault occurs in the power distribution system. This zero-sequence current can suppress the neutral point voltage.
3. The active arc-extinguishing device according to claim 2, characterized in that, The fault current compensation module (5) includes an arc suppression coil connected between the neutral point and the arc suppression controller (4); The zero-sequence current generation module (6) includes an inverter connected between the neutral point and the arc suppression controller (4).
4. The active arc-extinguishing device according to claim 3, characterized in that, The pulse generation module (1) includes a step-up transformer connected between the neutral point and the arc suppression controller (4); The voltage arc suppression module (2) includes an arc suppression transformer connected between the neutral point and the arc suppression controller (4); The current compensation module (3) includes an H-bridge converter connected between the neutral point and the arc suppression controller (4).
5. The active arc-extinguishing device according to claim 4, characterized in that, The step-up transformer is model SFS9-DSX; and / or The arc-suppression transformer is model DKSCB13-50; and / or The H-bridge converter is model TPCA8062-H; and / or The arc suppression coil is of model ITRT-PXB, XHK-Ⅱ, AL-XHBZ or GX-PXH; The inverter model is SG125HV-185KTL.
6. The active arc-extinguishing device according to any one of claims 2 to 5, characterized in that, The arc suppression controller (4) includes: The main control module (41) is connected to the fault current compensation module (5); A power control module (42) is connected between the main control module (41) and the current compensation module (3); A tap changer module (43) connected between the main control module (41) and the voltage arc suppression module (2); and A transformer control module (44) is connected to the main control module (41), the pulse generation module (1), and the zero-sequence current generation module (6).
7. The active arc-extinguishing device according to claim 6, characterized in that, The main control module (41) includes: An FPGA, comprising a signal filtering circuit for connecting to a monitoring system of the power distribution system to obtain operating parameters of the power distribution system and filtering the operating parameters; and A processing circuit connected to the FPGA, fault current compensation module (5), power control module (42), tap changer module (43) and transformer control module (44) for receiving the filtered operating parameters and controlling the operation of the fault current compensation module (5), power control module (42), tap changer module (43) and transformer control module (44).
8. The active arc-extinguishing device according to claim 7, characterized in that, The processing circuit includes a digital signal processor, model DSP56301.
9. The active arc-extinguishing device according to claim 6, characterized in that, The power control module (42) includes an intelligent power module connected between the main control module (41) and the current compensation module (3); The tap changer module (43) includes a non-excitation tap changer connected between the main control module (41) and the voltage arc suppression module (2); The transformer control module (44) includes an inverter controller connected to the main control module (41), the pulse generation module (1), and the zero-sequence current generation module (6).
10. The active arc-extinguishing device according to claim 9, characterized in that, The model of the intelligent power module is 6MBP15RY060; and / or The model of the non-energized tap changer is WRTYⅢ250 / 10-3X3; and / or The inverter controller model is YJ-15-46TD.