TW507222B - A method for regulating induced voltage in a transformer, and a method for regulating reactive power in a reactor; a transformer and a reactor employing the aforesaid methods - Google Patents

Abstract

The invention relates to a method for regulating induced voltage in a transformer, alternatively for regulating reactive power in a reactor, comprising arranging a regulating winding on a regulating means rotatable around a magnetic flux carrier, transferring a variable part of said regulating winding from said regulating means to a storage means or vice versa to vary the length of the regulating winding around the magnetic flux carrier, and providing flux linking means for transferring magnetic flux from the regulating means to a main winding of the transformer or reactor. The invention also relates to a transformer/reactor for the realization of the method.

Description

A7 B7 Printed by the Central Bureau of quasi-Ministry of Economic Affairs of the People ’s Republic of China, printed by the co-workers. 5. Description of the invention (/ check) The present invention relates to a transformer or reactor, and a method for adjusting the induced voltage in a transformer or a Method of reactive power of a reactor. The present invention relates to both a transformer and a reactor with a single core (as described later), and a transformer and a reactor with an air core. It is used in all transfers and distributions of electricity. Transformers, and their task is to make electricity exchange between two or more power systems. Current transformers cover almost all voltage ranges, from a few VA-up to 1000MVA. The so-called power transformer usually refers to Transformers with rated output from several hundred kVA-up to more than 1000 MVA, and transformers with transmission voltages from 3 to 4 kV-up to very high. Traditional power transformers include a transformer core (hereinafter, 〃), it is made in a laminated way (preferably oriented sheet metal) (usually a steel sheet). The transformer core contains several hearts The feet are connected by a yoke. Yes, a mirror wire is wound around the fd and the chest in the form of a secondary winding, a secondary winding, and an adjustment winding. In the electric surface device, it depends on the practice to concentrically The structure is arranged and distributed along these hearts. Using a __, dry-type warship (that is, a completely oil-free transformer) = instead of an oil-cooled money force device, it is possible for many years. This kind of «transformer Equipped with a high-voltage insulated conductor design, the winding has a solid solid green insulation in the design of a cable (such as a so-called XLPE cable) that transfers power to wheels. The dry-type transformer using the process can be more discerned to be used at a considerably higher voltage.: Response 2 cores, per-phase configuration τ Guan 豕 榡 quasi (CNS) A4 threat (21GX297 > ^^ (please read the back first) (Please fill out this page for the items of intent to be removed) Binding-507222 A7 ______B7_ V. Description of the Invention (爻)

Winding. The previous descriptions of transformers also generally apply to reactor Q. For different reasons, it is usually necessary to be able to adjust (or set) the voltage of the power transformer. This action of adjusting (or setting) the voltage can be applied to, for example, keeping the secondary voltage constant while the primary voltage is variable; the secondary voltage is variable; providing a reduced voltage to start a rotating machine; providing A neutral point to generate or handle unbalanced currents in different circuits and so on. For this reason, the transformer is equipped with an adjustable winding (hereinafter referred to as "adjusting winding 〃"), which can adjust the transformer ratio. " Regarding transformers used in low voltages, it has been known in the past from French patents FRs 0 & 544 and British patents GB 1-341-005 that by adjusting the winding drum (and the winding is Do not loop) and change the effective length of the winding. However, such applications are strictly limited to transformers with lower voltages. This is because the types of windings used in high-voltage transformers are completely different. The windings of high-voltage transformers are solid-state. In addition, such a type of transformer is also involved. Problems with windings. … '~ A conventional process for traditional power transformers (such as square gauges and oil-cooled transformers) used in higher voltage ranges. (For example), The. J & p Bureau shellfish consumer cooperative printing

Transformer Book " (A. C. Fu Cao Kelin et al., U. I983, U. ed.), The book describes how to adjust in different ways. The two most common methods are: The first method j uses a so-called off-load tap changer. In this method, tapping can be performed between different voltage outputs in the transformer box, but this can only be done in the transformer = The second method is to use a so-called shunt switch. In this method, different voltage wheels protruding outside the transformer box are used for tapping. Therefore, it can be performed under load. . This paper size is applicable to China National Standard (CNS) A4 specification (210X297 mm) V. Description of the invention (彡) In order to be able to ㈣- # power transformers for voltage regulation in the electronic reading money (continuously) , Global Patent Saki mls = Presser 'Use-soft continuous wire winding, winding can be however' magnetic force will be applied in the ㈣9_i7315 patent, because the windings are healthy- As a result, these electromagnetic forces are exacerbated. The _Electromagnetic Z will cause the winding or the end ring or the clamp system to break, which will cause power failure. The reaction of an adjusting winding of the device ball patent w099 / i7315 The purpose of the present invention is to provide a solution to the aforementioned problems and improve the high-quality __wohe reactor (especially the title transformer and reactor) method. Another object of the present invention is to obtain such an improved Wei / reactor. These purposes were achieved by applying for a method of item 1 of the patent scope, and by applying a transformer / reactor of item 2 of the patent scope. Therefore, the present invention relates to a method for adjusting the obscured voltage in a transformer, or a reactive power method in a reactor, which includes an adjusting device t rotating around a magnetic flux plant. Arrangement-adjustment winding; turn the ―variable part of the aforementioned adjustment winding from the front adjustment device to the adjustment device (or the device to the adjustment device) to change the length of the adjustment winding around the magnetic flux carrier And provide a H-flux communication device to transfer the magnetic flux from the adjustment device to this paper. Applicable to the Central Park National Unit (CNS) A4 * inspection (21〇 > < 297 mm)

A main winding to a transformer or reactor. Magnetic flux = body The present invention relates to a transformer or a reactor, which contains a __ which is equipped with a main winding, and which can be transferred from the storage device in the surrounding magnetic flux-carrying-storing section. Go ahead to change the music _ or transfer from the aforementioned adjustment device to the aforementioned storage device), the flux connection = the length of the magnetic flux delete _ whole _; and the magnetic mat = the predicate _ volume recording «transfer pressure One King Mirror Group. It is preferable that each of the magnetic flux-linking devices includes a balanced winding, which is divided into two 2-speed parts, each of which has a coil winding. Its quick connection type makes the main magnetic flux almost unaffected when the leakage magnetic flux is redistributed. The first part is connected to the windings of the adjustment device (the adjustment device preferably has a rotatable drum), and the second part is connected to the magnetic flux carrier (where the main winding is arranged). Such a balanced winding may be constituted by a simple twisted loop. Alternatively, the balanced winding may have a plurality of windings connected in parallel on the adjusting device so as to cancel the short-circuit force. The magnetic flux carrier can be a transformer core or a reactor core (as described above). However, the present invention is also applicable to air core transformers and reactors (also described above). The adjustment winding (and preferably even the main winding) preferably includes at least one electric conductor carrying current, a first semiconducting layer surrounding at least one electric conductor, and a solid insulating layer surrounding the first semiconducting layer, And a second semiconducting layer surrounds the aforementioned insulating layer. These windings can be printed by the solid-state, (21〇x297f) 507222 A7 B7 V. Description of the invention (6) The printed green (that is currently used for power distribution) is printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs. Cable, for example, XLPE cable or cable with EPR insulation. The type 电缆 cable is flexible, which is an important characteristic for the purposes described in this specification, because the windings are made of cable wires, and the cable wires are bent when combined. The flexibility of an XLPE cable is usually equivalent to that of a cable with a diameter of 30, which has a bending loneliness of about 20 cm; for a cable that has always been 80_, its bending loneliness is about eScm. . In the embodiment of the present invention, the term "flexibility" is used to indicate that the "flexibility of the winding is as small as the curvature of the winding is about twice the diameter of the cable, preferably four to eight times the diameter of the cable. Times. These flexible windings should be structurally capable of retaining their characteristics, even when subjected to thermal or mechanical stress during use. The combination of materials described above should be considered as examples. A combination that can meet the above conditions and have semiconducting conditions, for example, its resistance is applied within 10 1 ~ 10 fcCm, that is, 丄 ~ 500, or ~ 200 Ω, αη, It is naturally also within the scope of the present invention. The insulating layer may include (for example) a corresponding thermoplastic solid material, for example, low density polyethylene (LDPE), high density polyethylene (HDpE), polypropylene (PP), poly (PB), Polymethyl lin (τρχ), crosslinked material, for example, crosslinked polyethylene (XLPE), or rubber, for example, ethylene propylene rubber (HPR) or silicone rubber. The inner and outer (first and second) semiconducting layers can use the same basic material but use granular conductive materials, such as oil fume or mixed metal powder. Please read first

I i Binding material among which is ethylene vinyl acetate copolymer / nitrified rubber gland paper. Applicable medium ratio (CNS) 8 4 (210X297 mm) " 4 ~ 507222 Employees' Cooperatives of Central Bureau of Standards, Ministry of Economic Affairs Printing A7 B7 5. Description of the invention (€) (EVA / NBR), butyl fused polyethylene, ethylene butene acrylate copolymer (EM) and ethylene ethyl lysine copolymer (EEA) are also suitable for use as A polymer of the second semiconducting layer. The conductivity of the second semiconducting layer is sufficient to make the potential along each layer almost completely balanced. The conductivity of the outer semiconducting layer is strong enough to contain the electric field in the cable, but weak enough not to cause a significant increase in loss due to the induced current in the layer. Therefore, each of the two semiconducting layers basically contains a first-order plane, and the two layers will almost completely contain the electric field between them. Of course, in this insulating layer, it is possible to arrange another layer or more than one semiconductor layer. An example of an insulated conductor or cable suitable for use in the present invention is described in more detail in the global patents WO97 / 459! 9 and WO97 / 45847. Further descriptions of this insulated conductor or cable can be found in the global patents W09? / 45918, W097 / 45930 and W97 / 4.593l.特征 The method of the present invention is characterized in that starting from a zero position and adjusting at that position, there is no winding on the rotating drum of the group, and the warp feeling of the transformer / reactor: two voltages / reactive power is in the winding It follows the same force as the direction of the main winding, and it will increase when the coil is wound on the _whole winding device; and the variable reactor _ induced lai / reactive power, the remaining winding is followed by ㈣ 王 _ The direction of the coil will be reduced when it is wound on the adjusting winding device in the opposite direction. With this feature, the maximum transformation of the winding is +-N, where N is the winding applied on the rotating drum of the adjusting winding. . The advantage achieved in this way is that the winding can be changed without steps, or it can be changed with / optional number of turns. Wood paper scales are applicable; -----—__ Cabinet operation rate (CNS) (2H) X297 male thin) pieces-: ----(Please read the notes on the back ** before filling in this (Page) -Dingchuan / 222 A7 — B7 V. Description of the invention (7 ^ '—,-Circling the adjustment _ in one direction, naturally it is equivalent to unwinding the adjustment lens group in the opposite direction. If the entire adjustment winding is wound in the-deviating direction, we assume that the winding direction is the same as that of the main winding, so -maximum induced voltage / reactive power is obtained. Then, by starting the adjustment winding in the opposite direction Before coiling, unwinding will occur, and the voltage / power drop will naturally occur. The storage device may include a rotatable storage drum, which is similar to the rotatable adjustment winding drum constituting the adjustment unit. The unwinding is best performed by arranging the adjustment windings on a rotatable device (such as the aforementioned rotatable drum), but other solutions are also possible. In addition, other solutions related to the storage device The method is also possible, for example, using several drums, According to another embodiment of the present invention, the adjustment winding may be arranged on a magnetic flux carrier foot belonging to one phase in a multi-phase system, and the The main winding can be installed on a magnetic flux carrier chest belonging to the other phase in the multi-phase system. The advantage of this arrangement is that it can be phase-shifted. Printed by the Consumer Cooperative of the Central Procurement Bureau of the Ministry of Economy In another embodiment, the storage device may include a second winding arranged around the phase / magnetic flux carrier other than the phase belonging to the adjustment winding in the Dober system. Via such an arrangement, the voltage control ( The best can be achieved at the same time by adjusting the winding) and the phase shift (by the second winding). The transfer device includes a driving device for adjusting the rotation of the drum and a driving device for storing the Rotate these drives. The form of the device is preferably at least one motor and a moving device for belt driving each of the drums. Therefore, it is possible to share a motor to simultaneously / move the paper. National Gujia Standard (CNS) A4 specification (210 X297 mm) ^ (0 '---- --- ----5. Description of the invention (fork) The adjustment _ drum and _ rely on their own motor. _ Pressure device also Yes, two to three adjustment drums can also have it-in a three-phase warship, it also has: a = continued (for example) windings are independent of the entire winding compared to the other two, and each of them According to another embodiment of the present invention, each of the windings can be designed to rotate at an equal speed. According to another embodiment of the present invention, the adjusting winding drum can follow two directions. Therefore, it is made into two drum parts, and the two drum parts are joined together in the radial direction to form the drum. — According to the present invention, a particularly preferred embodiment, the insulated conductor of the foregoing winding is diseased. The second layer is connected to a predetermined potential, preferably a ground potential. As mentioned earlier, this has the advantage that the electric field generated around the current-carrying conductor is contained in the solid insulation layer. As a result of this, there is no electric field outside the winding, and another advantage is that it is usually possible to apply the technology that was originally only used in the low voltage range and electronics. The high-voltage conductor preferably has a diameter between 20 and 25 mm, and a conductor area between ~ S000 face 2. The first layer is preferably at the same potential as the current carrying system. The second layer is preferably arranged such that it forms a nearly completely equipotential surface around the (or other) current-carrying conductor. The paper size of this portable paper is in accordance with Chinese National Standard (CNS) A4 (210 X 297 mm) -U-Read Reload Page Printed by Staff Consumer Cooperative of Central Standards Bureau, Ministry of Economy Chuan 7222 A7

The conductor of the flow can contain several strands, whereby at least one of the strands is not insulated from the inner semiconducting layer, and each of the last three layers can be firmly connected to the adjacent layer along the entire connection surface . Another / characteristic of the present invention is that at least one (or both) of the adjustment winding drum or the storage drum is configured to connect the aforementioned second layer having the semiconducting characteristic of the winding to a preset potential (Preferably ground potential). There are several ways to design this kind of connection device. In addition, the adjustment winding is preferably provided with a device capable of grounding the conductor in the winding. The device is preferably in the form of a sliding contact, for example, in the form of a half. In the crevice, the present invention will be described in detail only by citing the preferred embodiments, with particular reference to the accompanying drawings. In the illustration: FIG. 1 is a diagram showing a method according to the present invention. The principle of a transformer is shown, but the balanced winding is not shown; Figure 2 is a schematic diagram showing an embodiment of a transformer according to the present invention; and Figure 3 is a schematic diagram printed by the Consumer Cooperative of the Central Procurement Bureau of the Ministry of Economic Affairs. A further embodiment of a transformer according to the invention is shown; FIG. 4 is a diagram showing the axial force in the transformer shown in FIG. 3. Description of the symbol of the jt piece of H Tugui: Part of the picture: Zhang Jixiang uses the Chinese National Standard (CNS) A4 specification (210X297) & 5. Description of the invention (π) 1: transformer core 5: winding coil 8: half drum Part of Figure 2: 2: Main winding 6: Rotating drum 12: Storage drum 3: Adjusting winding 7: Half drum 2: Main winding kit Figure three part: 6: Adjusting winding drum 13: Balance winding 3: Adjusting winding 6: Adjustment Winding drum 14: Balanced winding star ϋ Α Α 亲 Figure 1 shows a transformer core: In the transformer,-the main winding 2, = =-green two feet, in this please

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I Luxury Printing Printed by the Consumers Cooperatives Group 3 of the China Procurement Bureau of the Ministry of Economic Affairs was arranged around the other chest, and one adjustment was made around the form. _Performance group_ = More = on drum 6. Here we can rotate the == way to separate the rotating drum ^ Sui Sui The drum is installed on the two-foot temple surrounding the transformer core. The rotary drum is configured with at least blue: it is driven by a motor (not shown) for belt drive. This way = the entire winding functions like a-bribe coil. The number of winding coils on the whole winding is wound by the mirror group ring 5-the rotatable winding step of the storage drum 12 m «changes. Similarly, the storage drum 12 is also preferably driven by a stirrup as a belt. In the case where the balanced winding is not sounded, when the adjustment winding 3 is wound on the adjustment winding drum 6 and unloaded from the adjustment winding drum 6, the _ ampere-turn balance will be unbalanced, which greatly increases the short circuit. force. The paper size ㊈Tii home standard (CNS) Ya 4 threats (210X297 mm)-~ (幺, 80 will come the way, the transfer line reservation line 507222 A7 _B7_ V. Description of the invention ((I) Figure 2 shows A transformer comprising a main winding set 2 having high-voltage (HV) and low-voltage (LV) turns. An adjusting winding drum 6 is provided. A balanced winding 13 which comprises a simple-connected coil, One of the coils has at least one turn arranged in or around the main winding 2 while the other coil has the same number of turns and is arranged to be connected to the adjusting drum 6 through magnetic flux. This can increase approximately 10 short-circuit forces due to application. Fig. 3 shows another transformer in which a balanced winding 14 is wound inside the adjusting winding drum 6. The balanced winding contains several coils, each of which has a number of coils. The coils are connected in parallel. As shown in FIG. 4, the axial force on the balanced winding is almost equal to the axial force on the adjustment winding 3 on the adjustment winding drum 6 and opposite. In other words, , When the balanced winding is mechanically When receiving this adjustment winding drum, these axial forces will effectively cancel each other out. Please read the back and the above notes. Note the matters before the binding. Printed by the Central Government Bureau of the Ministry of Economic Affairs, Consumer Cooperatives. CNS) A4 size (210X297 mm)

Claims (1)

Repair dragon Patent application Fanyuan 1. A method for adjusting the induced voltage in the hybrid, which includes: adjusting -__ around the __1 following-the magnetic flux of the rotation of the plant, adjusting the device; adjusting the front fan female-can The changed part is transferred from the storage device to the storage device (or the length of 2. = from the storage device; and the magnetic flux connection device is provided. =. Ί, the adjustment device is transferred to the Wei-main winding. Kind of transformer, It contains:-magnetic flux carrier, equipped with a main winding carrier rotating-on the adjustment device = adjustment winding;-storage device, a part of the front fan adjustment winding can be stored lightly ___ recording (Or transfer from the aforementioned adjustment device to the aforementioned storage = the length of the adjustment winding around the flux carrier; and magnetic LI 'to move the magnetic flux from the adjustment device to a main line of the transformer. 3. == 围Item 2 device, wherein the magnetic flux device includes a balanced winding, which is divided into a first part and a second part: each of the first part and the second part have at least one turn And both have the same lap, put _ group, the second winding is arranged there. Wang Li 4 · = Shen__Second Zhijia rhyme surfacer, in which, _ contains-rotatable_winding drum. AW patent scope 5. According to the patent No. 4 of the patent fan garden, Among them, the balancing key group has several windings connected in parallel and connected in parallel (and mechanically connected) to the adjusting winding drum. 6. According to the Chu pressure device in the scope of the patent application, the fourth item, wherein, the The adjusting winding drum includes at least two drum parts, and the two parts are joined together in a radial direction to form a drum. 7. According to the second or third item of the scope of the patent application_county, wherein the storage device Contains a rotatable storage drum. 8. The transformer according to item 4 of the patent application, wherein the storage device includes-rotatable and non-storage, and is configured "The transfer device includes a drive device for adjusting the winding The rotation of the wire drum and the driving device are used for the rotation of the storage drum. 9. The transformer according to item 8 of the scope of the patent application, wherein the aforementioned drive winding device is composed of at least-a motor and-a device for driving the ΪΓ wire drum with a belt. @ 整 10. According to the scope of patent application The transformer according to item 8, wherein the winding drum can rotate in two directions. Η. The bribe device according to item 2 or 3 of the scope of the patent application, wherein the storage device includes a second winding arranged at- Around the magnetic flux. Phase 12 'according to the application_contact 2 object chat device, of which the mirror group is recorded in the belongs to-more "_where ^ of _: magnetic flux Wei body _qiao_ miscellaneous 507222 A8 B8 C8 D8 It is arranged on the foot of a magnetic flux carrier of another phase belonging to the multi-phase system. Please read it first, memorize the notes and precautions on this page, and then f. This page 13. According to item 2 or 3 of the patent application park The calendar of item, wherein the adjustment winding is configured with a device for electrical connection to the main winding. 14. The transformer according to item 2 or 3 of the scope of patent application, wherein the adjustment winding includes at least one current-carrying conductor, a first semiconducting layer surrounding at least one conductor, and a solid insulating layer surrounding the foregoing The first semiconducting layer and a second semiconducting layer surround the aforementioned insulating layer. 15. The transformer according to item 14 of the application, wherein the second semiconducting layer is connected to a predetermined potential. 16. The transformer according to item 15 of the application, wherein the preset potential is a ground potential. Γ7. The transformer according to item 2 or item 3 of the patent application scope, which is a dry-type transformer. Printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs 18. A method for adjusting reactive power in a reactor, comprising: winding an adjustment coil on an adjustment device that can rotate around a magnetic flux carrier ; Moving a variable part of the aforementioned adjustment winding from the aforementioned adjustment device to a storage device (or from the storage device to the adjustment device) to change the length of the adjustment winding around the magnetic flux carrier And a magnetic flux connection device is provided to transfer the magnetic flux from the adjustment device to a main winding of the reactor. This paper size applies to Chinese National Standard (CNS) A4 specification (210X297 mm) 507222 Printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs A8 B8 C8 D8 6. Application for patent scope 19. A reactor, which contains a magnetic flux Dong Zhati, a main winding is arranged on an adjustment device that rotates around the aforementioned magnetic flux carrier. An adjustment winding is arranged; a storage device, a variable part of the front fan adjustment winding can be obtained from The aforementioned storage device is transferred to the aforementioned adjustment device (or transferred from the aforementioned adjustment device to the aforementioned storage device) to change the length of the adjustment winding around the magnetic flux carrier; and the magnetic flux speed knot device to transfer the magnetic flux from The adjustment device was transferred to a main winding of the reactor. 20. The reactor according to item 19 of the scope of patent application, wherein the magnetic flux connection device includes a balanced winding, which is divided into a first part and a cross-linked first part, a first part and a second part. Each part has at least one turn and both have the same number of turns. The first part is connected to the winding on the adjusting device, the second part is connected to the magnetic flux wearing body, and the main winding is arranged there. 21. The reactor according to claim 19 or claim 20, wherein the adjusting device includes a rotatable adjusting bobbin. '22. The reactor according to item 21 of the scope of patent application, wherein the balanced winding has a winding connected in parallel and arranged on (and mechanically connected to) the adjusting bobbin. 2. The reactor according to item U of the scope of patent application, wherein the adjusted winding drum includes at least two drum parts, and the two parts are joined together to form a drum. (Please read the notes on the back of the asset before filling out this page). Jm, π This paper fruit scale is applicable ^ country ^^ (CNS) A4 specifications 77 ^ X297 ^^-'^ 507222 A8 B8 _ ^ __ VI. Application Scope of patent 24. The reactor according to item 19 or 20 of the patent application, wherein the storage device includes a rotatable storage drum. 25. The reactor according to item il of the scope of patent application, wherein the storage device includes a rotatable storage drum and a transfer device is provided, the transfer device includes a driving device for adjusting the rotation of the winding drum, And the driving device is used for the rotation of the storage drum. 26. The reactor according to claim 25, wherein the driving device is composed of at least a motor and a device for driving each of the winding drums by a belt. 27. The reactor according to item 25 of the scope of patent application, wherein the adjusting bobbin can rotate in two directions. 28. The reactor according to claim 19 or claim 20, wherein the storage device includes a second winding arranged around a magnetic flux carrier. Printed by the Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs 29. The reactor according to item 19 or 20 of the scope of patent application, wherein the adjustment winding is arranged on a magnetic flux carrier of one of the phases belonging to a multi-phase system The storage device includes a winding arranged on the foot of a magnetic flux carrier belonging to another phase of the multi-phase system. 30. The reactor according to item 19 or 20 of the scope of the patent application, wherein the adjustment winding is configured with a device for electrical connection to the main winding. This paper size applies to the Chinese National Standard (CNS) A4 specification (210X297 mm) 507222 A8 B8 C8 D8 VI. Application scope of patent 31. According to the reactor of the 19th or 20th of the patent application scope, the adjustment The winding includes at least one current-carrying conductor, a stack of half conductive layers surrounding the at least one conductive body, a solid insulation layer surrounding the aforementioned first semiconductive layer, and a second semiconductive layer surrounding the aforementioned insulating layer. 32. The reactor according to claim 31, wherein the second semiconductor layer is connected to a predetermined potential. 33. The reactor according to claim 32, wherein the preset potential is a ground potential. 34. The reactor according to item 19 or 20 of the scope of patent application is a dry reactor. (Please read the notes on the back of the fund before filling out this page) Order Printed by the Consumer Cooperatives of the Central Bureau of Standards of the Ministry of Economic Affairs This paper size applies to the Chinese National Standard (CNS) A4 specification (210X297 mm)