200919895 九、發明說明： 【發明所屬之技術領域】 本發親娜_轉_峨器；特別的 财及-種零相序電域波^的零相序阻抗調整。 【先前技術】 在3相4線式配電系統中，如果負荷是不平衡的，在 統的中性線上將有零相序成份雷& '糸 絲_出現。所有的零相序電流是彼 :，且相互間沒有相序存在，因而中性線上: =線上的零相序電流的量的3倍。然而，不管負荷是否平衡: 在中性式Γ餘統上_線性諸都料致零相序電流呈現 而’因非線性負載大量使用在使用三相^配 一般商業大樓t ’有時造成一般商業大樓的中性線零相 序成知電麵1甚至可能超過相電流。200919895 IX. Description of the invention: [Technical field to which the invention belongs] The present invention relates to the zero-phase sequence impedance adjustment of the zero-phase sequence electric domain wave. [Prior Art] In the 3-phase 4-wire power distribution system, if the load is unbalanced, there will be a zero phase sequence component Ray & '糸丝_ appears on the neutral line of the system. All zero-phase sequence currents are: and there is no phase sequence between them, so the neutral line: 3 times the amount of zero-phase current on the line. However, regardless of whether the load is balanced: On the neutral system, the linear phase currents are presented in the zero-phase currents and the 'current use due to the non-linear load is used in the general commercial building t'. The zero-phase sequence of the neutral line of the building becomes even more than the phase current.
At、其中，中性線的零相序電流早已被認為不利於系統運作，可 降Γ成的包括巾性線過載、魏11過熱、可_系統容量 务低、增加功率損失與其他的已知問題。 2夕糸統破推薦以處理3相4線式配電系統的中性線零相序電 卩較為複雜與昂貴，且需要複雜化的電子裝置，使得使用 時更是相對麻煩。 相皮在1相4線式配電系統中，通常使用具有—低零相序阻抗零 I相序獻讀制零相序諧波。藉由低的零相序阻抗以吸 Y相序㈤波電流，使流人配電系統巾的零相序諧波可有效地減 200919895 二射广用物目賴_之字型接_電抗料自轉 支^，由於、可靠性與容易絲上之優點 四線式配電系蛘Φ ,、,知士，丄 叩书用於二相 糸、、死中以控制中性線的零相序電流。 _ ’―零相相波財被設計成針對零 财能的蝴，魏合找零⑽魏轉騎 ㈣盡可能迫物目序樹w零相 = 求狀、兄下二紅配電純。細，在有些特殊系統需 建筚物中’ 4要—高阻抗;例如在配電系統中，特別是在商業 =中’因設備的相對頻繁擴充，而可能使新的系統需求增加。 ^狀況下，麵電_，她存麵之觸波器必須 ，Γ適應此特殊的高阻抗；並針對此—高阻抗狀況的需求， 以客W化設計的—之字型濾波器將賴。 第一圖為切技_示，以齡—種帶有可罐零相序阻抗 、、相序_;慮波&、，其包括第—、第二與第三細腳，每一鐵 ，具有第-與第二線圈連接成一之字型電抗器，每—第一線圈At, where the zero-phase current of the neutral line has long been considered to be detrimental to the system operation, it can be reduced to include the towel line overload, Wei 11 overheating, _ system capacity low, increased power loss and other known problem. It is more complicated and expensive to handle the neutral zero-phase sequence of the 3-phase 4-wire power distribution system, and it requires complicated electronic devices, which makes it relatively troublesome to use. In a 1-phase 4-wire power distribution system, phase-phase harmonics are usually produced using a low-phase-sequence impedance zero-phase sequence. By the low zero-phase sequence impedance to absorb the Y phase sequence (five) wave current, the zero-phase harmonic of the flow distribution system towel can be effectively reduced by 200919895. Support, due to the reliability and easy on-line advantages of the four-wire power distribution system 蛘Φ,,, know, the book is used for two-phase 糸, dead to control the zero-phase current of the neutral line. _ ─ ― 零 零 零 零 零 零 零 零 零 零 零 零 零 零 零 零 零 零 零 零 零 零 零 零 零 零 零 零 零 零 零 零 零 零 零 零 零 零 零 零 零 零 零 零 零 零 零 零 零 零 零Fine, in some special systems, it is necessary to build high-impedance; for example, in power distribution systems, especially in commercial = medium, due to the relatively frequent expansion of equipment, it may increase the demand for new systems. ^ Under the condition, the surface of the electric _, the surface of the wave device must be, Γ adapt to this special high impedance; and for this - the need for high-impedance conditions, the user-designed - zig-zag filter will depend. The first picture shows the cutting technique, the age-type with the canned zero phase sequence impedance, the phase sequence _; the wave &, which includes the first, second and third fine feet, each iron, The first and second coils are connected into a zigzag type reactor, each of the first coil
3al、3M、3cl具有—輸入端點削、13b卜13cl以連接至此三 相電力供應網路的其中—相a、b、c，每一第二線圈H 3c2的、结束點被連接至一共同端點n，以連接至一中性線導體， 、使用改欠在同一鐵心腳上第一線圈的有效圈數與第二線圈的 有放11數的相對比值作為調整零相雜抗的手段。其藉由一零相 序的之字型濾波&提供在每―鐵心腳上的線圈之—上帶有一或多 個分接頭，或是—輔助線圈城、編、㈣上帶有一或多個分接 200919895 頭 13錢2、13。2、13蝴、_^^ :^之―，·視需要’勤魏上的_裝置，湘此分接頭或 :助線圈，以經由此分接頭或輔助線_輪人端點重建電源麟 波斋的連接。此種具有額外分接頭捕助線_之字型電抗写， =調整零相序磁通以提供—種調整零相序諧波電流遽波器的零 且抗，可在轉個體不變的狀況下，當在配電網路上的改變 "要時’能配合狀變職心的零鱗岐，而不需要苴 他的外來裝備或更替以客製化設計的新褒備。 ==具有額外分接蝴助線_之觸划，在藉由 狀魏波糾耗雜辦，也觀變該遽 成份波動的不·響。 〜心成配電祕的正序與負序 裝置=相要配合μ變—零相序遽波器 ⑽新$備.=>時’不需要其他的外來裝備或更替以客製化設 ，’^毅11裝置驗料-纽變該裝置的 【發明内容】几影響該裝置的正序阻抗與負序阻抗。 本發明的目的在提供一種 整的裝置與方法，作為調整在一多相序阻抗調 共同端點物她nuu 器的正序阻抗與負序阻抗。 亥零相序處波 為實現上•求，本翻提供—《方細作為調整在 200919895 相ί阶電源與—負荷之間—帶有共同端點的零相序據波器的零 ^ 其中’該裝置含有一阻塞器帶有兩端點與-或多個分 AC^—輪人中性線和—輪出中性線，而輸人中性線連接至多相 心、’與輪出中性線連接至負荷，以及零相序濾波器的共同端 =由阻塞it输⑽罐觸改 分翻科段时狀_貞荷並聯轉相序遽波 态的零相序阻抗。 2 ’在3相4線式配電純中，零相序濾波器的共同端點 點連=目Γ流的成份會呈現，造成與零相序濾波器的共同端 \ 社也祇存在零相序電流成份；故可藉由改變阻塞 Γ一個分接頭的連接的手段，達成改變與負荷並聯的零相序濟 細抗，且祇辟配衫財的零婦電流成份。此 垃制開關在3相4線式配電系統中改變連接的阻塞器的分 接頭，對透過阻塞器與中性線連接的零相序濾波器而言，可以達 2改㈣相序濾波H的零婦阻抗，而不影轉相序濾波器的 正序阻抗與負序阻抗。 的改進’本發明的各個實施例中均可在多相AC電源和 :才目序纽敗間的輸人中性線上連接—個額外的阻塞器；此種 可增加電源的中性線阻抗，使得零相序電流經由配電變愿 阻礙在系統別處產生的零相序成份 “’亚可防止因操作不當㈣1_生的不利影塑。 此外’本發明的阻塞器可以是電感器，因而，好不消耗能 200919895 量，故對系統的效率不會有不良的影響。 當本發明在實際施行之際，本發啊財其他各種且不完全 一樣的實體化措施，·其能僅修整數個本發明的細節，而不偏= 發明所敍述申請專利範圍所記載之各項技術事項的觀點，來實行 本發明。_，本伽所作之贿及_似是在 上之朗，歧魏奸之關。 心本貝 【實施方式】 本發_零相序電流紐糾零相序阻抗調整的裝置鱼方法 適用於在—多相AC電源配電系統中調整多相AC：電、糾由“ 突i日皮+汰^ 』正夕邳AL窀源和中性線的 ^序本㈣贼置與方法調整在—多相就電_-負荷 二走同端點的零相稍波器的零相序阻抗時 零相序濾波器的正序阻抗與負序阻抗。 办曰 第二_-本發_裝置財法㈣—實 路圖，以朗本發_裝置連接以—制的多相ac=㈣電 的帶有共同端點的零相序_波 电，、，、型 為一典型的帶有丑同線性負荷。第三圖 示。第四圖為-典轉相序遽波器30的—電路圖圖 咖的―電路、:’、问端點的wye—deita零相序濾、波器 可以是如第三圖所示的之字有共同端點的零相序遽波器 w，delta零相序浐波 电㈣3〇 ’或是以第四圖所示的 令相序A波副a替換在第 相序遽波器30。在第二圖中中心有共同端點的零 _、咖連接至-多rL 藉由接點咖、 接至夕相AC電源ί0與一非線性負紙 200919895 序濾、波器30的共同端點N連接至—阻塞器4〇的兩端里 4〇1，並經由阻塞器的一個分接頭（伽或42b或42c或:中之— 兩端點其中之另-端點搬藉由控制開關5〇連接述2幻或 性線101和前述的輪出中性線。 ，、輸入中 2二關電路财，因零相序濾波器的共 相:電流的成份會呈現，造成連接至零相 阻塞器上也祇存在零相序電流；故而，以下述說明 由控制開㈣以改變阻塞器4G的—個分接頭的連接 _接㈣陶撕_細齡_ 42b，將= 透舰塞⑦40與輸_線並聯連接至非_荷 =效零相序阻抗增加的改變，且祇影響電路圖中的零相 =^種運作效應，將可達到改變與㈣並聯連接的零相辆 序=寻对相序阻抗’而不影響零相序濾波器的正序阻抗與負 使=特殊系統需求需要的狀況下，不需針對一高阻抗狀況 二、/ ^各製化設計的一之字型濾波器將原裝置替換。而 系、充而求’適且的改換控制開關連接的阻塞器的分接頭， 即可達到改變裝置的零相序阻抗以配合系統需要。 第五圖為本發明的裝置與方法的第二實施例具體化的一電路 f，以說明本發明的裝置連接以一典型的多相AC電源、-典型的 、同而‘柏♦彳目序濾波器與—典型的非線性負荷。圖中，焚 相賴波器30藉由接謂a、獅、期c連接在一多相AC電, 10 200919895 ίο與一非線性負荷2f) & a’，且一輸入中性、線101和一輸出中性線 妾至阻塞器40的兩端點其中之—他，並經由阻塞器的一 個分接碩（42a或42b或饭或卿或兩端點其中之另一端點搬 I曰由^制Μ 50連接至零相稍波器3G的共同端點N。 第六圖為本發置與方法的第三實關具體化的—電路 2 1〇柄g㈣裝置連接以—典型的多相Μ電源、—典型的 ▼有^、同U的零相序濾波器與—典型的非線性負荷。圖令，零 相序濾波器30藉由接點3()la、、謝c連接在一多相ac電源 與一非線性負荷之間；且零相序濾波器3㈣共同端點n連 ,至阻基A 4〇的兩端點其中之—肌，以及阻塞器兩端點的另一 而‘’占402連接至-輸入中性線m，並經由阻塞器的一個分接頭 (42a或42b或42c或42d)藉由控制開關5〇連接至一輸出中性 線 102。 第二實施例與第三實施例也可如第—實施例的例示說明，藉 秘姻關50以改變阻塞器4G的—個分接頭的連接，而使透^ 阻基盗與輸出巾性線與非線性貞荷並聯連接的零相賴波器的等 效零相序阻抗的改變’域影響電路圖中的零相序電流成份。 第七圖為本發明的裝置與方法的第四實施例具體化的一電路 圖’類同於第二圖電路圖的增加—個額外的阻塞器6〇在前述的多 相AC電源10和前述的零相序濾波器3〇之間的輸入中性線谢 上’以抑制在纽鹏產生的零相序成份進人零相序濾、波器。此 外’第二實施例與第三實_也可如第四實施例的例示，增加一 200919895 個額外的阻塞器在前述的多相AC電源和前述的 的前述的輸人中性線上（未顯示）。 H。之間 實際運作時’各細可以如第—實施例之响說明，將各 貝鉍例的零相序魏器視設計需要 、 別或賢delta零相'波器_。用之子型零相序遽波器 明1==行H 來闡明本發明，但本發 月亚不衫_實鄉狀關。在本_种 Γ少量的各式各樣的-些例示。本發明能夠二 其他組合及魏巾，而且㈣在不超賴 發= 念的範圍内改變或修正。 1兄月之本發明概 【圖式簡單說明】 技術圖示，蘭示_種帶有可瓣零辦 相序電流濾波器。 々 第二圖為本發明的裝置與方法的第—實施 ★ 以說明本發_裝置連接以-典型❹相AC電源、—， 共同端_零相序舰器與—典 〃 W有 :圖三:為——斷_二波器的-電路 ::::典型嘯共同端點的一零相序_的- 核明的裝置與方法的第二實施例具體化的—電路圖， 柄明的裝置連接以一典型的多相Ac電源、一典型的帶有 12 200919895 端點的零相序濾波器與—典型的非線性負荷。 圖， 典型的帶有 =圖為本發明的裝置與方法㈣三實施例具體化的 h兄明本發明的裝置連接以-典型的多相AC電源、 二同端點的零相序濾波軸—典型的祕性負荷。 裝置與方法的第四實施例具體化的—電路圖， 一零相序濾敝帅觸上。 彳AC電源和 【主要元件符號說明】 之子型電抗器的第—線圈3al、3W、3cl ^子型電抗器的第—線圈的輸入端點13a卜遍、13cl 二相的其中一相a、b、c3al, 3M, 3cl have - input terminal cut, 13b 13cl to connect to the phase a, b, c of the three-phase power supply network, and the end point of each second coil H 3c2 is connected to a common The end point n is connected to a neutral conductor, and the relative ratio of the effective number of turns of the first coil on the same core foot to the number 11 of the second coil is used as a means for adjusting the zero phase noise. It is provided with a zero-phase sequence zigzag filter & providing one or more taps on each of the cores of the core, or - one or more on the auxiliary coils, braids, and (four) Tap 200919895 head 13 money 2, 13. 2, 13 butterfly, _ ^ ^ : ^ ―, · as needed 'diligence on the _ device, Xiang this tap or: help coil to pass this tap or auxiliary Line _ wheel man endpoint reconstruction power Linbozhai connection. This type has an additional tapping line _ zigzag type reactance, = adjusts the zero phase sequence flux to provide a zero-adjustment of the zero-phase-order harmonic current chopper, which can be changed to the individual Under the circumstance, when the change on the distribution network is "when necessary", it can be changed to the zero scale of the job, without the need to smash his foreign equipment or replace the new equipment with customized design. == With the extra tapping of the helper line _ the stroke, in the Weibo wave to avoid miscellaneous, it is also changing the fluctuation of the 成份 component fluctuations. ~ Xincheng power distribution secret positive sequence and negative sequence device = phase to match μ change - zero phase sequence chopper (10) new $ preparation. => when 'no need for other foreign equipment or more custom, ' ^ Yi 11 device inspection - the new device of the device [invention] several affect the device's positive sequence impedance and negative sequence impedance. SUMMARY OF THE INVENTION It is an object of the present invention to provide an integrated apparatus and method for adjusting the positive sequence impedance and negative sequence impedance of a nuu device in a multi-phase sequence impedance modulation common terminal. The zero-phase phase of the wave is used to achieve the above-mentioned requirements, and this turn provides - "square fine as adjusted in 200919895 phase between the power supply and the load - zero phase sequence with a common endpoint of the zero ^ where" The device contains an occluder with two ends and/or a plurality of AC^-wheel neutrals and a round neutral, while the input neutral connects to the multiphase, 'with round neutral The line is connected to the load, and the common end of the zero-phase-sequence filter = the zero-phase sequence impedance of the chopping state of the parallel-phase-sequence chopping state. 2 'In 3-phase 4-wire power distribution pure, the common end point of the zero-phase sequence filter = the component of the target turbulence will be presented, resulting in zero phase sequence with the common phase of the zero-phase sequence filter The current component; therefore, by changing the connection of a tap and a tap, the zero phase sequence resistance in parallel with the load is changed, and only the zero current component of the shirt is provided. The waste switch changes the tap of the connected occluder in the 3-phase 4-wire power distribution system, and can achieve 2 (four) phase sequence filtering H for the zero phase sequence filter connected through the occluder and the neutral line. Zero-wife impedance, without affecting the positive-sequence impedance and negative-sequence impedance of the phase-sequence filter. Improvements can be made in various embodiments of the present invention by connecting an additional occluder to the input neutral line between the multi-phase AC power source and the input line; this can increase the neutral line impedance of the power supply, The zero-phase sequence current is forced to hinder the zero-phase sequence component generated in the system by the distribution. "The sub-prevention can prevent the adverse effect of the improper operation (4) 1_. In addition, the occluder of the present invention can be an inductor, and therefore, The energy consumption is 200919895, so there is no adverse effect on the efficiency of the system. When the present invention is actually implemented, the present invention has various other and not identical physicalization measures, which can only repair an integer number of the present invention. The details of the invention are not limited to the technical matters described in the scope of the patent application described in the invention. _, the bribes and _s of Benga seem to be on the top of the saga. Benbe [Embodiment] The device _ zero phase sequence current 纠 zero phase sequence impedance adjustment device fish method is suitable for adjusting multi-phase AC in the multi-phase AC power distribution system: electricity, correction by " sudden i day skin + ^^ 』正夕邳AL窀And the neutral line of the sequence (4) thief set and method adjustment in the multi-phase power _- load two go to the same end of the zero-phase slightly waver zero-phase sequence impedance of the zero-sequence filter positive sequence impedance and Negative sequence impedance. The second _-this is _ device financial method (four) - real road map, with the lang _ _ device connected to the system of multiphase ac = (four) electricity with a common end point of the zero phase sequence _ wave, , type is a typical with ugly linear load. The third picture shows. The fourth picture is the circuit of the circuit-switch diagram of the phase-sequence chopper 30, the circuit of the circuit diagram::, the wye-deita zero-phase sequence filter of the endpoint, and the waver can be the word as shown in the third figure. A zero phase sequence chopper w having a common terminal, a delta zero phase sequence chopping power (four) 3 〇 ' or a phase sequence A wave pair a shown in the fourth figure is substituted in the phase sequence chopper 30. In the second figure, the center has a common endpoint of zero _, coffee connected to - multi rL by the junction coffee, connected to the evening phase AC power ί0 and a non-linear negative paper 200919895 sequence filter, the common end of the wave 30 N is connected to - 4 〇 1 in both ends of the occluder 4 ,, and via a tap of the occluder (G or 42b or 42c or: - the other of the two terminals - the end point is moved by the control switch 5 〇Connect 2 illusion or sex line 101 and the aforementioned round-out neutral line. , Input 2 2 circuit off, due to the zero phase sequence filter common phase: the current component will appear, causing the connection to zero phase blocking There is only zero phase sequence current on the device; therefore, the following is explained by the control (4) to change the connection of the taper of the occluder 4G _ 接 (4) 陶 _ _ _ 42b, will = through the ship 740 and lose _ line connected in parallel to the non-charge = effect zero phase sequence impedance increase change, and only affect the zero phase = ^ operation effect in the circuit diagram, will be able to achieve the change and (four) parallel connection of the zero phase vehicle sequence = homing phase sequence The impedance does not affect the positive sequence impedance of the zero phase sequence filter and the negative = specific system requirements are required, no need to target Impedance condition 2, / ^ A zigzag filter of each system design replaces the original device, and the system replaces the tap of the occluder connected to the control switch to achieve the zero change of the device. Phase sequence impedance to match the needs of the system. Figure 5 is a circuit f embodied in a second embodiment of the apparatus and method of the present invention to illustrate the connection of the apparatus of the present invention to a typical multi-phase AC power source, -typical, The same as the 'Bai 彳 彳 order filter and the typical nonlinear load. In the figure, the combustion phase sifter 30 is connected to a multi-phase AC by means of a, lion, and period c, 10 200919895 ίο The non-linear load 2f) & a', and an input neutral, line 101 and an output neutral line 妾 to the two ends of the occluder 40 point - he, and via a splicer of a tap master (42a or The other end point of the 42b or rice or qing or the two ends is connected to the common end point N of the zero-phase apodulator 3G. The sixth figure is the third actual implementation of the method and method. Condensed - circuit 2 1 handle g (four) device connected with - typical multi-phase power supply, - typical ▼ has ^, the same U's zero-phase-sequence filter with a typical nonlinear load. The zero-phase-sequence filter 30 is connected between a multi-phase ac power supply and a non-linear load by a contact 3()la, 谢c And the zero-phase sequence filter 3 (4) is connected to the end point n, to the two ends of the block A 4〇, the muscle, and the other end of the blocker, and the '402 is connected to the input neutral. m, and connected to an output neutral line 102 via a tap (42a or 42b or 42c or 42d) of the occluder by the control switch 5 。 The second embodiment and the third embodiment can also be as in the first embodiment An illustration of the equivalent of a zero-phase filter connected in parallel with a non-linear charge and a non-linear charge connected by a secret bond 50 to change the connection of the taper of the occluder 4G. The zero phase sequence impedance change 'domain affects the zero phase sequence current component in the circuit diagram. Figure 7 is a circuit diagram of a fourth embodiment of the apparatus and method of the present invention. Similar to the circuit diagram of the second diagram, an additional occluder 6 is disposed in the aforementioned multi-phase AC power source 10 and the aforementioned zero. The input neutral line between the phase sequence filters 3〇 is on the 'to suppress the zero-phase sequence component generated in the New Peng into the zero-phase sequence filter and wave filter. Furthermore, the 'second embodiment and the third embodiment' may also be as exemplified in the fourth embodiment, adding a 200919895 additional occluder on the aforementioned multi-phase AC power source and the aforementioned aforementioned input neutral line (not shown) ). H. Between the actual operation, the details can be as described in the first embodiment, and the zero-phase sequence of the various examples can be regarded as the design, the other or the delta zero phase 'wave _. The sub-type zero-phase-sequence chopper is used to clarify the invention, but the current month is not the case. In this article, a small variety of various examples are given. The present invention is capable of two other combinations and Wei towels, and (d) is changed or corrected within the scope of not exceeding the meaning of the hair. 1 brother's invention of the invention [simplified description of the diagram] technical illustration, blue display _ kind of with a petal zero phase sequence current filter. The second figure is the first implementation of the device and method of the present invention. ★ To illustrate the connection of the device to the device - typical ❹ phase AC power source, -, common terminal _ zero phase sequence ship and - code 〃 W have: Figure 3 : - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Connected with a typical multiphase Ac power supply, a typical zero phase sequence filter with 12 200919895 endpoints and a typical non-linear load. Figure, typical with = diagram of the device and method of the present invention (four) three embodiments embodied h brother Ming device of the present invention connected with - typical multi-phase AC power supply, zero phase sequence filter axis of the same end point - Typical secret load. The fourth embodiment of the apparatus and method is embodied in a circuit diagram, and a zero-phase sequence filter is touched.彳AC power supply and [main component symbol description] The first coil of the sub-coil 3al, 3W, 3cl ^ sub-reactor of the sub-type reactor 13a input terminal 13a, 13cl two-phase one of the phases a, b ,c
之神電抗器的第二線圈3a2、3b2、3c2 之子型電抗器的輔助線圈3a3、3b3、3c3 令相序;慮波器的共同端點N 之字型電抗㈣輔助線圈的分接頭丨城、丨咖、⑶2、丨㈣、刪、 13c3 零相序濾波器30、3〇a 多相AC電源1〇 非線性負荷20 帶有分接頭的阻塞器4〇 阻塞器的分接頭其中之-42a、42b、42c、42d 阻塞器的兩端點其中之—4(n、碰 13 200919895 控制開關50 接點 301a、301b、301c 輸入中性線101 輸出中性線102 輸入中性線的額外阻塞器60 14The auxiliary coils 3a3, 3b3, and 3c3 of the sub-type reactors of the second coils 3a2, 3b2, and 3c2 of the god reactor make the phase sequence; the common end point of the filter N is the type of reactance (4) the tap of the auxiliary coil,丨,, (3) 2, 丨 (4), delete, 13c3 zero-phase sequence filter 30, 3〇a multi-phase AC power supply 1 〇 non-linear load 20 occluder with tap 4 〇 occluder tap - 42a, 42b, 42c, 42d Both ends of the occluder point - 4 (n, touch 13 200919895 control switch 50 contact 301a, 301b, 301c input neutral line 101 output neutral line 102 input neutral line additional occluder 60 14