EP3098827B1 - Einstellbares strömungsentlüftungssystem für ein buchholzrelais - Google Patents

Einstellbares strömungsentlüftungssystem für ein buchholzrelais Download PDF

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Publication number
EP3098827B1
EP3098827B1 EP15169198.7A EP15169198A EP3098827B1 EP 3098827 B1 EP3098827 B1 EP 3098827B1 EP 15169198 A EP15169198 A EP 15169198A EP 3098827 B1 EP3098827 B1 EP 3098827B1
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EP
European Patent Office
Prior art keywords
vent device
flow vent
contrast
buchholz relay
flow
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP15169198.7A
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English (en)
French (fr)
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EP3098827A1 (de
Inventor
Carlo Carollo
Andrea Tonin
Gianmaria Ugolin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ABB Schweiz AG
Original Assignee
ABB Schweiz AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by ABB Schweiz AG filed Critical ABB Schweiz AG
Priority to EP15169198.7A priority Critical patent/EP3098827B1/de
Priority to CN201610348204.3A priority patent/CN106206156B/zh
Publication of EP3098827A1 publication Critical patent/EP3098827A1/de
Application granted granted Critical
Publication of EP3098827B1 publication Critical patent/EP3098827B1/de
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/53—Cases; Reservoirs, tanks, piping or valves, for arc-extinguishing fluid; Accessories therefor, e.g. safety arrangements, pressure relief devices
    • H01H33/55—Oil reservoirs or tanks; Lowering means therefor
    • H01H33/555—Protective arrangements responsive to abnormal fluid pressure, liquid level or liquid displacement, e.g. Buchholz relays
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
    • H01H35/26—Details
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/40—Structural association with built-in electric component, e.g. fuse
    • H01F27/402—Association of measuring or protective means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
    • H01H35/40—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by devices allowing continual flow of fluid, e.g. vane
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/40—Structural association with built-in electric component, e.g. fuse
    • H01F27/402—Association of measuring or protective means
    • H01F2027/404—Protective devices specially adapted for fluid filled transformers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H36/00—Switches actuated by change of magnetic field or of electric field, e.g. by change of relative position of magnet and switch, by shielding
    • H01H36/02—Switches actuated by change of magnetic field or of electric field, e.g. by change of relative position of magnet and switch, by shielding actuated by movement of a float carrying a magnet

Definitions

  • the present invention refers to a Buchholz relay for the protection of oil insulated power electrical equipment, particularly power transformers.
  • An oil insulated power electrical equipment particularly comprising an insulating oil bath transformer, usually includes a Buchholz relay, which is an electrical device operating when in the transformer there is an abnormal evolvement of gas, usually sign of a serious failure, or when there are relevant oil flows.
  • a Buchholz relay which is an electrical device operating when in the transformer there is an abnormal evolvement of gas, usually sign of a serious failure, or when there are relevant oil flows.
  • the presence of gas and relevant oil currents inside an oil-insulated transformer may be an indication of a potentially dangerous malfunction in the transformer.
  • the Buchholz relay generally includes an outer casing, housing a frame for supporting an upper float and a lower float both suitable to operate respective magnetic switches.
  • the upper float enables or disables, by means of the respective switch, an alarm circuit while the lower float drives, in an equivalent manner, a trip circuit of the functioning of the transformer.
  • the Buchholz relay further comprises a flow vent device also connected to the trip circuit of the transformer from the supply.
  • the flow vent device comprises a shaped body, which, when it directly invested by relevant oil currents, with a value exceeding a predetermined threshold, rotates causing the intervention of the magnetic switch of the trip circuit. To reopen the contact, it is sufficient that the oil current falls below the predetermined threshold of intervention.
  • the aforesaid prearranged threshold is set by specific rules on the matter but very often is fixed by the same user, so that the manufacturer of the relay under consideration must necessarily diversify its production according to the calibration needs. It is stated precisely that the maximum sensitivity of intervention of the trip circuit corresponds to a minimum predetermined threshold of the sudden oil flow, whether volumetric or massive, which invests the flow vent device.
  • the flow vent device threshold of intervention is fixed and cannot be adjusted.
  • the need to adjust the flow vent device threshold of intervention has increased. This allows the manufacturer to standardize its production of the Buchholz relay leaving to the end user the possibility of choice on the threshold of intervention of the trip circuit in case of oil flow of high value.
  • a known Buchholz relay is disclosed in document WO 2009/019732 A1 .
  • the user can adjust the oil flow speed level by disassembling the Buchholz relay and substituting parts thereof, therefore with a sort of "trial and error” approach.
  • Further Buchholz relays according to the known art are disclosed in documents DE 32 48 275 A1 and EP 2 669 910 A1 .
  • the object of the present invention is to provide a Buchholz relay for the protection of oil insulated power electrical equipment, which allows the regulation of the oil flow speed level threshold without disassembling the Buchholz relay, such that the user is free to choose the predetermined threshold of intervention of the trip circuit without a "trial and error" approach.
  • the user can adjust the flow vent without opening the device by acting on a regulation device.
  • FIG. 1 A Buchholz relay for the protection of oil insulated power electrical equipment, particularly transformers, is illustrated in figure 1 , where it is generally indicated with 1.
  • the Buchholz relay 1 can be integrated between a transformer, not shown, and an expansion tank, or conservator, also not represented.
  • the Buchholz relay 1 comprises a support frame 2 which, in use, is in direct contact with the oil; floating means, as a whole indicated with 3, coupled to the support frame 2 relative to which they are mobile; switching means, as a whole marked with 4, operatively connected to the floating means 3, intended to enable or disable an alarm circuit and/or a trip circuit of the electrical equipment, not shown.
  • an outer casing 7 of the Buchholz relay 1 comprises a lid 8 from which preferably a discharge cock 10 for the exhaust of the gas departs.
  • a pneumatic test valve 11 and/or a member for mechanical test 9 can be further provided.
  • the outer casing 7 can be provided with a plug 35 for the discharge of oil.
  • the support frame 2 can be for example housed in a cavity 36 formed inside the outer casing 7, which is filled by oil in operation.
  • the outer casing 7 preferably comprises a first flange 12 for the connection of the relay to a transformer tank pipe (not shown) and a second flange 13 for the connection of the relay to an oil conservator pipe (not shown).
  • the floating means 3 preferably comprise a top mobile float 14 and a bottom mobile float 15.
  • the switching means 4 can comprise for example magnetic switches connected to the alarm circuit and the trip circuit of the transformer, respectively.
  • the top mobile float 14 and the bottom mobile float 15 act through corresponding magnetic switches on the alarm circuit and the trip circuit of the transformer.
  • the Buchholz relay 1 provides that, in the presence of a sinking of the oil level for example due to the formation of gas which flows inside the outer casing 7, the top mobile float 14 lowers and activates a first magnetic switch 16 which in turn operates the alarm circuit. Any further sinking of the oil level due to an increase of the formation of gas in the transformer is detected by the bottom mobile float 15 which consequently lowers and causes the immediate closure of the trip circuit activating a second magnetic switch 17.
  • the Buchholz relay 1 comprises a flow vent device 5 coupled to the support frame 2, in general suitable to be immersed in oil and to be invested by the oil flow in case of a fault, as discussed above.
  • Anomalous oil discharges between the transformer and the conservator are often the result of a serious fault inside the transformer, such as a discharge between the windings, and their adverse effects should be immediately blocked or severely limited.
  • the flow vent device 5 is movable between a first position and a second position and is configured to interact with the switching means 4, particularly with the second magnetic switch 17, which operates the trip circuit.
  • the flow vent device 5 can be provided with a switch, for example a magnetic switch 18, suitable to interact with the second magnetic switch 17 associated to the trip circuit.
  • the flow vent device 5 configured such that in the second position, it interacts with the trip circuit so to maintain the latter in an enabled condition, and in the first position, it interacts with the trip circuit so to maintain the latter in a disabled condition. Hence, in case of fault causing a relevant oil flow, the flow vent device 5 goes to the second position so to enable the trip circuit.
  • the Buchholz relay comprises contrast means 6 suitable to exert on the flow vent device 5 a contrast force.
  • the contrast force is such that the flow vent device 5 is maintained by the contrast force in the first position until the oil flow does not exceed a predetermined oil flow speed threshold value.
  • the contrast force is not sufficient to oppose the force acting on the flow vent device due to the oil flow. Therefore, when the oil flow exceeds said predetermined oil flow speed threshold value, the flow vent device 5 leaves the first position and moves towards its second position, thereby enabling the trip circuit, as discussed above.
  • the flow vent device 5 should be repositioned in the first position. This can be done for example manually by using the member for mechanical test 9, which forces the flow vent device 5 towards its first position.
  • the Buchholz relay 1 further comprises a regulation device 19 suitable to act on the contrast means 6 and/or on the flow vent device 5 in such a manner so to modify the contrast force which maintains the flow vent device 5 in the first position until oil flow speed does not exceed the oil flow speed threshold value.
  • a regulation device 19 suitable to act on the contrast means 6 and/or on the flow vent device 5 in such a manner so to modify the contrast force which maintains the flow vent device 5 in the first position until oil flow speed does not exceed the oil flow speed threshold value.
  • the contrast means 6 are configured such that the contrast force which maintains the flow vent device 5 in the first position depends on the position of the flow vent device 5 itself relative to the contrast means 6.
  • the contrast means 6 can comprise magnetic means suitable to exert a magnetic force on the flow vent device 5.
  • the magnetic contrast force can be either an attraction force or a repulsive force.
  • the contrast means 6 are configured so to exert an attraction magnetic force on the flow vent device 5.
  • the regulation device 19 may be configured to move the contrast means 6 relative to the flow vent device 5.
  • the regulation device 19 can act on the flow vent device 5 or both on the flow vent device 5 and on the magnetic contrast means 6 in order to modify the relative position thereof.
  • the contrast force can be exerted in a different manner other than the magnetic one.
  • the contrast means 6 can alternatively comprise elastic means, for example one or more springs, acting on the flow vent device 5 and pre-loaded so to exert the aforementioned contrast force.
  • the regulation device 19 can act on the springs so to modify their pre-loads.
  • the contrast means 6 can comprise one or more magnets 20 associated to the support frame 2, preferably in a fixed manner.
  • a first 20' and a second 20" magnets are provided on a rear wall 26 of the support frame 2 and fixed thereon by means of a screw 21.
  • a different number of magnets one or more can be alternatively provided.
  • the maximum magnetic contrast force can be varied by modifying the number of magnets.
  • the flow vent device 5 comprises a fin 22, still more preferably an at least partially plate-shaped fin.
  • the fin 22 envelopes according to a plane which in operation is transversal to the oil flow.
  • the fin 22 is pivotably coupled to the support frame 2, so to be able to rotate relative to the latter around a rotation axis A which is transversal, preferably orthogonal to the average oil flow direction.
  • the fin 22 can be coupled to the support frame 2 for example in correspondence to its lateral portion 23, preferably also plate-shaped, and still more preferably parallel to the average oil flow direction in operation conditions.
  • a pin 37 can couple the lateral portion 23 of the fin 22 to side walls 33 of the support frame 2.
  • the flow vent device 5 magnetic switch 18 can be for example associated to the lateral portion 23 of the fin 22.
  • the so configured fin 22 is rotatably movable between a raised position and a lowered position around a rotation axis A.
  • arrow F shows for example the rotational movement from the raised position towards the lowered position-
  • the raised position corresponds to the above mentioned first position of the flow vent device.
  • the upper part 22' of the fin (wherein "upper” is to be intended with reference to the orientation shown in the figures, which corresponds to the normal operation conditions of the relay 1) is in proximity to the magnet/s 20, such that the magnetic contrast force is maximized.
  • the lowered position corresponds to the above mentioned second position, and the same upper part is at a distance from the magnet/s 20, such that the magnetic contrast force is null or, in any case, not strong enough to oppose to the force exerted on the fin 22 by the oil flow.
  • the latter should be metallic, at least partially metallic, or should comprise at least a magnetic portion so to magnetically interact with the magnetic means.
  • the regulation device 19 comprises a wedge element 24.
  • the wedge element 24 can move relative to the support frame 2, and consequently relative to the fin 22, particularly the upper part 22' thereof, in a translational manner between a raised position (see figure 4 ) and a lowered position (see figure 5 ).
  • the wedge element 24 starts to interact with the fin 22, particularly it wedges between the upper portion 22' of the fin (the one being attracted by the magnets 20) and the rear wall 26 of the support frame 2 where the magnets 20 are positioned.
  • the wedge element 24 when moving towards the lowered position, tends to move the upper portion 22' of the fin 22, which rotates around its rotation axis A, in a position less close to the magnets, i.e. it tends to move the fin 22 towards its lowered position however keeping it in a sufficient proximity to the magnets such that a magnetic contrast force is still exerted, even if lower. Since the relative position of the upper portion 22' of the fin 22 and the magnets 20 changes, particularly their distance increases, the magnetic contrast force decreases. Consequently, the predetermined oil flow speed threshold value causing the enabling of the transformer trip decreases. In the same manner, of course, by moving the wedge element 24 towards the raised position, the oil flow speed threshold value can be increased.
  • the wedge element 24 comprises a V-shaped plate, comprising a first plate 24', which for example can be substantially parallel to the rear wall 26 of the support frame 2, and a second plate 24" transversal to the first plate 24', so to form a wedge suitable to interact with the upper part of the fin 22' as described above.
  • the regulation device 19 comprises an adjustment knob 27, or similar component, which can be directly operated by the user so to modify the predetermined oil flow speed threshold value.
  • the adjustment knob or similar component 27 can be for example arranged inside a housing delimited by lid 8.
  • the regulation device 19 further comprises a screw-nut group which in turns couples the adjustment knob or similar component 27 with the wedge element 24, such that a rotational movement of the adjustment wheel 27 results in a translational movement of the wedge element 24.
  • the screw-nut group can comprise a screw 28 rotationally integral with the adjustment knob or similar component 27.
  • the screw 28 can be for example positioned extending along the rear wall 26 of the support frame 2 on the same side of the magnets 20.
  • a nut 29 is coupled to the screw 28 and is free to translate relative the support frame 2 but is not free to rotate relative the latter. Therefore, a rotation of the screw 28 results in a translation of the nut 29.
  • the nut 29 is rigidly fixed to the wedge element 24, for example with the first plate 24'.
  • the connection can be realized through a connecting portion free to at least partially slide inside a slit 31 formed in the rear wall 26 of the support frame 2.
  • the nut 29 and the first plate 24' can be connected for example by one or more connecting screws 32.
  • the Buchholz relay according to the invention allows the user to adjust the predetermined oil flow speed threshold value by simply acting on the regulation device. Hence, the adjustment can be performed easily without disassembling the relay and a "trial and error approach" is no longer needed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Housings And Mounting Of Transformers (AREA)
  • Loading And Unloading Of Fuel Tanks Or Ships (AREA)

Claims (8)

  1. Buchholz-Relais (1) zum Schutz von ölisolierter elektrischer Stromausrüstung, das Folgendes umfasst:
    - einen Stützrahmen (2), der dazu geeignet ist, mit dem Öl in Kontakt zu kommen;
    - Gleitinstrumente (3), die mit dem Stützrahmen (2) gekoppelt sind und relativ dazu bewegbar sind;
    - Schaltinstrumente (4), die mit den Gleitinstrumenten (3) funktionsfähig verbunden sind und die geeignet sind, eine Alarmschaltung und/oder einen Auslösekreis der elektrischen Ausrüstung zu aktivieren bzw. zu deaktivieren;
    - mindestens eine Durchflussentlastungsvorrichtung (5), die mit dem Stützrahmen (2) gekoppelt ist und die funktionsfähig mit dem Auslösekreis verbunden ist, die dazu geeignet ist, dem Ölfluss ausgesetzt zu sein und die zwischen einer ersten Position, in der die Durchflussentlastungsvorrichtung (5) den deaktivierten Auslösekreis beibehält, und einer zweiten Position, in der die Durchflussentlastungsvorrichtung (5) den Auslösekreis aktiviert, bewegbar ist;
    - Kontrastinstrumente (6), die geeignet sind, eine Kontrastkraft auf die Durchflussentlastungsvorrichtung (5) auszuüben, die geeignet ist, die Durchflussentlastungsvorrichtung (5) in der ersten Position zu halten, solange die Ölflussgeschwindigkeit einen vorbestimmten Schwellenwert der Ölflussgeschwindigkeit nicht übersteigt, und die Durchflussentlastungsvorrichtung (5) zu lösen, so dass sie die zweite Position erreicht, wenn die Ölflussgeschwindigkeit den Schwellenwert der Ölflussgeschwindigkeit übersteigt;
    - eine Regulierungsvorrichtung (19), die geeignet ist, auf die Durchflussentlastungsvorrichtung (5) oder sowohl auf die Durchflussentlastungsvorrichtung (5) als auch auf die Kontrastinstrumente (6) zu wirken, um dadurch die Kontrastkraft zu ändern,
    wobei die Durchflussentlastungsvorrichtung (5) eine Lamelle (22) umfasst, die schwenkbar mit dem Stützrahmen (2) gekoppelt ist und zwischen einer gehobenen Position, die der ersten Position der Durchflussentlastungsvorrichtung (5) entspricht, und einer gesenkten Position, die der zweiten Position der Durchflussentlastungsvorrichtung (5) entspricht, bewegbar ist,
    dadurch gekennzeichnet, dass die Regulierungsvorrichtung (19) ein Keilelement (24) umfasst, das zwischen einer gehobenen Position und einer gesenkten Position relativ zu dem Stützrahmen (2) bewegbar ist und das geeignet ist, mit der Lamelle (22) zu interagieren, wenn die letztere sich in der gehobenen Position befindet, um so die Position der Lamelle (22) entsprechend der gehobenen Position zu verändern.
  2. Buchholz-Relais (1) nach Anspruch 1, wobei die Kontrastinstrumente (6) so ausgestaltet sind, dass die Kontrastkraft von der Position der Durchflussentlastungsvorrichtung (5) relativ zu den Kontrastinstrumente (6) abhängt, wobei die Regulierungsvorrichtung (19) geeignet ist, diese relative Position zu ändern.
  3. Buchholz-Relais (1) nach Anspruch 1 oder 2, wobei die Regulierungsvorrichtung (19) dazu ausgelegt ist, die Kontrastinstrumente (6) relativ zu der Durchflussentlastungsvorrichtung (5) zu bewegen.
  4. Buchholz-Relais (1) nach einem der vorstehenden Ansprüche, wobei die Kontrastinstrumente (6) magnetische Kontrastinstrumente umfassen, die geeignet sind, eine magnetische Kontrastkraft zwischen der Durchflussentlastungsvorrichtung (5) und den Kontrastinstrumenten (6) auszuüben.
  5. Buchholz-Relais (1) nach Anspruch 4, wobei die magnetischen Kontrastinstrumente geeignet sind, eine Kontrastkraft magnetischer Anziehung auszuüben.
  6. Buchholz-Relais (1) nach Anspruch 4 oder 5, wobei die magnetischen Kontrastinstrumente einen oder mehrere Magneten (20) umfassen, die starr mit dem Stützrahmen (2) gekoppelt sind.
  7. Buchholz-Relais (1) nach einem der Ansprüche 4 bis 6, wobei die Lamelle (22) zumindest teilweise aus Metall besteht oder mindestens einen magnetischen Abschnitt umfasst, um so magnetisch mit den magnetischen Kontrastinstrumenten gekoppelt zu sein, wenn sie sie sich in der gehobenen Position befindet.
  8. Buchholz-Relais (1) nach einem der vorstehenden Ansprüche, wobei die Regulierungsvorrichtung (19) ein Stellrad (27) umfasst, das mit dem Keilelement (24) durch eine Schrauben-Muttern-Gruppe verbunden ist, so dass die Drehung des Stellrads (27) zu einer Übersetzung des Keilelements (24) führt.
EP15169198.7A 2015-05-26 2015-05-26 Einstellbares strömungsentlüftungssystem für ein buchholzrelais Active EP3098827B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP15169198.7A EP3098827B1 (de) 2015-05-26 2015-05-26 Einstellbares strömungsentlüftungssystem für ein buchholzrelais
CN201610348204.3A CN106206156B (zh) 2015-05-26 2016-05-24 用于瓦斯继电器的可调节流体出口系统

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP15169198.7A EP3098827B1 (de) 2015-05-26 2015-05-26 Einstellbares strömungsentlüftungssystem für ein buchholzrelais

Publications (2)

Publication Number Publication Date
EP3098827A1 EP3098827A1 (de) 2016-11-30
EP3098827B1 true EP3098827B1 (de) 2018-10-17

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EP15169198.7A Active EP3098827B1 (de) 2015-05-26 2015-05-26 Einstellbares strömungsentlüftungssystem für ein buchholzrelais

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EP (1) EP3098827B1 (de)
CN (1) CN106206156B (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108072578B (zh) * 2017-12-28 2023-08-15 河南省计量科学研究院 巴克霍尔兹压痕硬度仪

Family Cites Families (6)

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Publication number Priority date Publication date Assignee Title
DD207645A3 (de) * 1982-02-04 1984-03-07 Dietrich Kroll Stauklappe fuer schutzeinrichtungen
ITPD980059A1 (it) * 1998-03-19 1999-09-19 Comem Spa Rele' perfezionato di tipo buchholz
ITVI20070223A1 (it) 2007-08-07 2009-02-08 Comem Spa Rele di buchholz per la protezione di apparecchiature elettriche di potenza isolate in olio.
CN202678212U (zh) * 2012-03-21 2013-01-16 上海市电力公司 一种瓦斯继电器的内芯构件
PL2669910T3 (pl) * 2012-05-31 2016-04-29 Abb Schweiz Ag Urządzenie zabezpieczające do transformatorów elektrycznych i związany z nim transformator elektryczny
CN103489706A (zh) * 2013-10-12 2014-01-01 国家电网公司 一种智能化瓦斯继电器

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Title
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CN106206156A (zh) 2016-12-07
EP3098827A1 (de) 2016-11-30
CN106206156B (zh) 2019-07-23

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