CN112071672B - Vacuum on-load tap-changer transition device and switching method of transition device - Google Patents

Vacuum on-load tap-changer transition device and switching method of transition device Download PDF

Info

Publication number
CN112071672B
CN112071672B CN202010710305.7A CN202010710305A CN112071672B CN 112071672 B CN112071672 B CN 112071672B CN 202010710305 A CN202010710305 A CN 202010710305A CN 112071672 B CN112071672 B CN 112071672B
Authority
CN
China
Prior art keywords
vacuum circuit
circuit breaker
load current
over switch
load
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
CN202010710305.7A
Other languages
Chinese (zh)
Other versions
CN112071672A (en
Inventor
张书琦
杨帆
李戈琦
汪可
李金忠
李鹏
李刚
刘雪丽
孙建涛
程涣超
徐征宇
王健一
遇心如
梁宁川
吴标
王琳
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.)
State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
Original Assignee
State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
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.)
Filing date
Publication date
Application filed by State Grid Corp of China SGCC, China Electric Power Research Institute Co Ltd CEPRI filed Critical State Grid Corp of China SGCC
Priority to CN202010710305.7A priority Critical patent/CN112071672B/en
Priority to PCT/CN2020/130617 priority patent/WO2022016758A1/en
Publication of CN112071672A publication Critical patent/CN112071672A/en
Application granted granted Critical
Publication of CN112071672B publication Critical patent/CN112071672B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/0005—Tap change devices
    • H01H9/0038—Tap change devices making use of vacuum switches
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
    • H01F29/04—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings having provision for tap-changing without interrupting the load current
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/0005—Tap change devices
    • H01H9/0016—Contact arrangements for tap changers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/0005—Tap change devices
    • H01H9/0027—Operating mechanisms
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere

Abstract

The invention discloses a transition device of a vacuum on-load tap-changer, comprising: a main transfer switch S1, an auxiliary transfer switch S2, circulation vacuum circuit breakers RV1 and RV2, a load current vacuum circuit breaker MV and transition resistors R1 and R2; compared with the existing structure transition circuit, the device can obviously reduce the action parts in the tap changer, reduce the complexity of the mechanical structure, balance the switching capacity of the circulating current vacuum circuit breaker and the load current vacuum circuit breaker, improve the electrical service life of the whole vacuum on-load tap changer, and solve the problems of the existing device that the mechanical structure is complicated and the electrical service life of the vacuum on-load tap changer is low.

Description

Vacuum on-load tap-changer transition device and switching method of transition device
Technical Field
The application relates to the field of tap changer transition, in particular to a vacuum on-load tap changer transition device, and simultaneously relates to a switching method of the vacuum on-load tap changer transition device.
Background
An on-load tap changer is a switching device which provides constant voltage for a transformer when the load changes. The basic principle is that switching between taps in a transformer winding is realized under the condition of ensuring that load current is not interrupted, so that the number of turns of the winding, namely the voltage ratio of the transformer, is changed, and the purpose of voltage regulation is finally realized. The vacuum type on-load tap changer mainly realizes arc extinguishing by a vacuum tube of a change-over switch, and electric arcs and hot gas are not exposed; the oil in the oil chamber of the tap changer cannot be carbonized and polluted, and the oil does not need to be purified; the burning corrosion of the contact in the vacuum tube can be minimized. The on-load tap-changer mainly comprises a change-over switch, a conversion selector and an electric mechanism.
The on-load tap-changer is required to be provided with a transition circuit and a selection circuit when the on-load tap-changer is switched with a load, and different voltage regulation circuits are required by different voltage regulation modes, so that the circuit of the on-load tap-changer consists of the transition circuit, the selection circuit and the voltage regulation circuit. The transition circuit is a series resistance circuit bridged between tapping points, and the corresponding mechanism is a change-over switch or a selection switch which is the tapping point of the transformation transformer winding under the charged state. The tap changer adopts the principle of a transition circuit to realize tap changing operation. The transition circuit has single, double, four or multiple resistors based on the number of the transition circuit resistors, and may be combined into various transition circuits based on the contact fractures with single, double, etc. The transition circuit and the switching program have different influences on the contact task of the change-over switch, and whether the electric arc can be reliably extinguished in the first half cycle is limited or not depends on the required switching task to a great extent.
The quantity of mechanical change-over switches in a switching core of a traditional on-load tap-changer is large, for one pole, the mechanical change-over switch generally comprises 2 main circuit switches and 2 auxiliary change-over switches, and the mechanical structure is complex. The vacuum circuit breaker which is not connected with the transition resistor in the on-load tap changer is a load vacuum circuit breaker and only bears the task of breaking load current; the vacuum circuit breaker connected with the transition resistor is a circulating vacuum circuit breaker, which only bears the task of breaking internal circulating currents. According to the experience of extra-high voltage direct current engineering, the load current single-column winding of the converter transformer is generally 500-600A, the internal circulating current flowing on the transition resistor is about 900-1000A, and the internal circulating current passing through the circulating current vacuum circuit breaker is obviously larger than the load current, so that after multiple times of switching, the ablation degree of the load vacuum circuit breaker and the circulating current vacuum circuit breaker is different, and the switching burden and the electrical damage of the circulating current vacuum circuit breaker are more serious. Therefore, it is desirable to provide a transition circuit with a simple mechanical structure, which can alleviate the task of switching the circulating vacuum bubble, balance the switching capacities of the load vacuum circuit breaker and the circulating vacuum circuit breaker, and further improve the electrical life of the whole vacuum on-load tap-changer.
Disclosure of Invention
The application provides a vacuum on-load tap-changer transition device which is used for solving the problems that an existing device is complex in mechanical structure and low in electrical service life of a vacuum on-load tap-changer.
The application provides a vacuum on-load tap-changer transition device includes: a main transfer switch S1, an auxiliary transfer switch S2, circulation vacuum circuit breakers RV1 and RV2, a load current vacuum circuit breaker MV and transition resistors R1 and R2;
the main change-over switch S1 has four static contacts a, b, c and d; a. the electrode c is respectively connected with an odd-numbered stage and an even-numbered stage of an on-load tap-changer tap-selector, the electrodes b and d are respectively connected with circulating current vacuum circuit breakers RV1 and RV2, the vacuum circuit breakers RV1 and RV2 are respectively connected with transition resistors R1 and R2, the transition resistors R1 and R2 are respectively connected with the odd-numbered stage and the even-numbered stage of the on-load tap-changer tap-selector, the fixed end of an S1 transfer switch actuating arm is connected with a transformer neutral point, and a moving contact can be rotationally connected with four fixed contacts a, b, c and d;
the auxiliary change-over switch S2 has two static contacts of e and f in total; e. the f electrode is respectively connected with an odd-numbered stage and an even-numbered stage of a tapping selector of the on-load tapping switch, the fixed end of the S2 switch action arm is connected with a neutral point of the transformer through a load current vacuum circuit breaker MV, and the moving contact can be rotatably connected with two fixed contacts e and f;
the circulating current vacuum circuit breaker RV1 is used for cutting off circulating current between two gears when the tap switch transition device is switched from an odd gear to an even gear;
the circulating current vacuum circuit breaker RV2 is used for cutting off circulating current between two gears when the tap switch transition device is switched from an even gear to an odd gear;
and the load current vacuum circuit breaker MV is used for cutting off the load current when the tap changer transition device is switched from an odd-numbered gear to an even-numbered gear and/or the even-numbered gear is switched to the odd-numbered gear.
Preferably, the fixed end of the moving contact of the main transfer switch S1 and one end of the load current vacuum circuit breaker MV are both connected to the neutral point of the transformer to output current.
Preferably, the method further comprises the following steps:
when the gears of the on-load tap-changer are in odd tapping, a moving contact of an action arm of a main change-over switch S1 is conducted with a fixed contact a, and a moving contact of an action arm of an auxiliary change-over switch S2 is conducted with a fixed contact e;
the load current vacuum circuit breaker MV is conducted, the circulation vacuum circuit breakers RV1 and RV2 are conducted, and the load current I N The fixed contact a of the main change-over switch S1 is connected to the neutral point output through the S1 switch action arm, and meanwhile, the e contact of the auxiliary change-over switch S2 is connected in parallel, and the load current breaker MV outputs.
The application also provides a conversion method of the vacuum on-load tap-changer transition device, which comprises the following steps:
the moving contact of the action arm of the main change-over switch S1 is changed from a to b fixed contact;
the load current vacuum circuit breaker MV is disconnected, the load current is cut off, and an electric arc is generated;
when the electric arc in the load current vacuum circuit breaker MV is extinguished, the action arm of the auxiliary change-over switch S2 is changed from the fixed contact of the connection e to the fixed contact of the connection f;
closing the load current vacuum circuit breaker MV, transferring the load current from an odd gear to an even gear, and simultaneously connecting the odd gear and the even gear by the transition device to form bridging and generate circulating current;
the circulation vacuum circuit breaker RV1 is disconnected, circulation current is cut off, and electric arcs are generated;
when the electric arc in the circulation vacuum circuit breaker RV1 is extinguished, the moving contact of the action arm of the main change-over switch S1 is changed from the b position to the c position contact, and meanwhile, the circulation vacuum circuit breaker RV1 is closed for standby, so that the vacuum on-load tap-changer transition device is changed from the odd number gear to the even number gear.
Preferably, after the step of switching the moving contact of the moving arm of the main transfer switch S1 from the a contact to the b contact, the method further comprises:
odd-numbered load current flows through the auxiliary change-over switch S2 and the load current breaker MV and is output through the load current breaker MV, and meanwhile, the odd-numbered load current is connected with the transition resistor R1 and the circulating current breaker RV1 in parallel and is output through a contact b of the main change-over switch S1.
Preferably, after the step of extinguishing the arc in the load current vacuum circuit breaker MV, the method further comprises:
odd-numbered load current sequentially flows through the transition resistor R1, the circulating current vacuum circuit breaker RV1 and a b contact of the main change-over switch S1 to be output.
Preferably, the method further comprises the following steps:
when the gears of the on-load tap-changer are in even number tapping, a moving contact of an action arm of a main change-over switch S1 is communicated with a static contact c, and a moving contact of an action arm of an auxiliary change-over switch S2 is communicated with a static contact f;
the load current vacuum circuit breaker MV is conducted, the circulation vacuum circuit breakers RV1 and RV2 are conducted, and the load current I N Is connected to the neutral point output through a main change-over switch static contact c and an S1 switch action arm, and is connected with auxiliary change-over in parallelF contact of switch S2, load current breaker MV output.
The application also provides a conversion method of the vacuum on-load tap-changer transition device, which comprises the following steps:
the moving contact of the action arm of the main change-over switch S1 is changed from c to d fixed contact, the load current vacuum circuit breaker MV is disconnected, and electric arc is generated;
when the electric arc in the load current vacuum circuit breaker MV is extinguished, the action arm of the auxiliary change-over switch S2 is changed from the fixed contact of the connection f to the fixed contact of the connection e;
closing the load current vacuum circuit breaker MV, and simultaneously connecting the even-numbered gear and the odd-numbered gear by the transition device to form bridging, generating circulating current and transferring the load current from the even-numbered gear to the odd-numbered gear;
the circulation vacuum circuit breaker RV2 is disconnected to generate electric arc;
when the electric arc in the circulation vacuum circuit breaker RV2 is extinguished, the movable contact of the action arm of the main change-over switch S1 is changed from d to the fixed contact a, and meanwhile, the circulation vacuum circuit breaker RV2 is closed for standby, so that the vacuum on-load tap-changer transition device is changed from an even gear to an odd gear.
Preferably, after the step of switching the moving contact of the actuating arm of the main transfer switch S1 from c to d, the method further comprises:
even-numbered load current flows through the auxiliary change-over switch S2 and the load current breaker MV and is output through the load current breaker MV, and meanwhile, the transition resistor R2 and the circulating current breaker RV2 are connected in parallel and are output through a d contact of the main change-over switch S1.
Preferably, after the step of extinguishing the arc in the load current vacuum circuit breaker MV, the method further comprises:
even-numbered load current sequentially flows through the transition resistor R2, the circulating vacuum circuit breaker RV2 and the d contact of the main change-over switch S1 to be output.
The application provides a vacuum on-load tap-changer transition device includes: a main transfer switch S1, an auxiliary transfer switch S2, circulation vacuum circuit breakers RV1 and RV2, a load current vacuum circuit breaker MV and transition resistors R1 and R2; compared with the existing structure transition circuit, the device can obviously reduce the action parts in the tap changer, reduce the complexity of a mechanical structure, balance the switching capacity of the main vacuum circuit breaker and the auxiliary vacuum circuit breaker, improve the electrical service life of the whole vacuum on-load tap changer, and solve the problems that the mechanical structure of the existing device is complicated and the electrical service life of the vacuum on-load tap changer is low.
Drawings
Fig. 1 is a schematic diagram of a transition device of a vacuum on-load tap changer according to the present application;
fig. 2 is a schematic diagram of a vacuum on-load tap changer transition arrangement shown in the present application;
fig. 3 is a schematic diagram of a transition device of a vacuum on-load tap changer according to the present application;
fig. 4 is a schematic diagram of a vacuum on-load tap changer transition arrangement shown in the present application;
fig. 5 is a schematic diagram of the vacuum type on-load tap changer transition device illustrated in the present application;
fig. 6 is a schematic diagram of a vacuum on-load tap changer transition arrangement shown in the present application;
fig. 7 is a schematic diagram of a vacuum on-load tap changer transition arrangement shown in the present application;
fig. 8 is a schematic diagram of a vacuum on-load tap changer transition arrangement shown in the present application;
fig. 9 is a schematic diagram of a vacuum on-load tap changer transition arrangement shown in the present application;
fig. 10 is a schematic diagram of the vacuum type on-load tap changer transition arrangement shown in the present application;
fig. 11 is a schematic diagram of a vacuum on-load tap changer transition arrangement shown in the present application;
fig. 12 is a schematic diagram of a vacuum on-load tap changer transition arrangement shown in the present application;
fig. 13 is a schematic diagram of a vacuum on-load tap changer transition arrangement shown in the present application;
fig. 14 is a schematic diagram of a vacuum on-load tap changer transition arrangement shown in the present application;
fig. 15 is a schematic diagram of the transition sequence of the vacuum on-load tap changer illustrated in the present application, which is converted from N → N + 1;
fig. 16 is a schematic diagram illustrating the transition of the vacuum on-load tap changer from the N +1 → N transition sequence shown in the present application;
fig. 17 is a switching arrangement of another on-load tap changer of the present application;
Detailed Description
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of implementation in many different ways than those herein set forth and of similar import by those skilled in the art without departing from the spirit of this application and is therefore not limited to the specific implementations disclosed below.
The application provides a vacuum on-load tap-changer transition device, its structure is as shown in figure 1, includes: a main transfer switch S1, an auxiliary transfer switch S2, circulation vacuum circuit breakers RV1 and RV2, a load current vacuum circuit breaker MV and transition resistors R1 and R2;
the main change-over switch S1 has four static contacts a, b, c and d in total; a. the electrode c is respectively connected with an Odd-numbered stage (Odd Tap) and an Even-numbered stage (Even Tap) of an on-load Tap-changer tapping selector, the electrodes b and d are respectively connected with circulating current vacuum circuit breakers RV1 and RV2, the vacuum circuit breakers RV1 and RV2 are respectively connected with transition resistors R1 and R2, the transition resistors R1 and R2 are respectively connected with the Odd-numbered stage and the Even-numbered stage of the on-load Tap-changer tapping selector, the fixed end of an S1 transfer switch action arm is connected with a transformer neutral point, and a moving contact can be rotationally and selectively connected with four static contacts a, b, c and d;
the auxiliary change-over switch S2 has two static contacts of e and f in total; e. the f electrode is respectively connected with an Odd gear (Odd Tap) and an Even gear (Even Tap) of a tapping selector of the on-load tapping switch, the fixed end of an S2 switch action arm is connected with a neutral point of the transformer through a load current vacuum circuit breaker MV, and a moving contact can be rotatably connected with two fixed contacts of e and f;
the circulating current vacuum circuit breaker RV1 is used for cutting off circulating current between two gears when the tap switch transition device is switched from an odd gear to an even gear;
the circulating current vacuum circuit breaker RV2 is used for cutting off circulating current between two gears when the tap switch transition device is switched from an even gear to an odd gear;
and the load current vacuum circuit breaker MV is used for cutting off the load current when the tap changer transition device is switched from the odd-numbered gear to the even-numbered gear and/or the even-numbered gear is switched to the odd-numbered gear.
The fixed end of the moving contact of the main change-over switch S1 and one end of the load current vacuum circuit breaker MV are both connected with the neutral point of the transformer so as to output current.
When the gears of the on-load tap-changer are in odd tapping, a moving contact of an action arm of a main change-over switch S1 is communicated with a fixed contact a, and a moving contact of an action arm of an auxiliary change-over switch S2 is communicated with a fixed contact e;
the load current vacuum circuit breaker MV is conducted, the circulation vacuum circuit breakers RV1 and RV2 are conducted, and the load current I N The fixed contact a of the main change-over switch S1 is connected to the neutral point output through the S1 switch action arm, and meanwhile, the e contact of the auxiliary change-over switch S2 is connected in parallel, and the load current breaker MV outputs.
When the tap changer is switched from an odd gear to an even gear, the switching method of the vacuum on-load tap changer transition device comprises the following steps:
the moving contact of the action arm of the main change-over switch S1 is changed from a to a fixed contact b, the odd-numbered load current flows through the auxiliary change-over switch S2 and the load current breaker MV and is output through the load current breaker MV, and simultaneously, the transition resistor R1 and the circulating current breaker RV1 are connected in parallel and are output through the contact b of the main change-over switch S1. Breaking the load current vacuum circuit breaker MV to generate an arc, after which the odd-numbered load current I is extinguished N Sequentially flows through a transition resistor R1, a circulation vacuum circuit breaker RV1 and a b contact output of a main change-over switch S1, and the recovery voltage U at the two ends of the load vacuum circuit breaker MV MV ＝I N ×R1；
When the electric arc in the load current vacuum circuit breaker MV is completely extinguished, the action arm of the auxiliary change-over switch S2 is changed from the e fixed contact to the f fixed contact, and the odd-numbered load current I N Sequentially flows through a transition resistor R1, a circulation vacuum circuit breaker RV1 and a b contact output of a main change-over switch S1;
closing the load current vacuum circuit breaker MV to change the load current from odd gearsShifting to even gear, connecting the transition device with odd gear and even gear to form bridge connection to generate circulating current
Figure BDA0002596284660000061
Even-numbered stage load current I N F contact flowing through the auxiliary change-over switch S2 and the load current vacuum circuit breaker MV output; current I flowing through the load current vacuum circuit breaker MV MV ＝I N +I RV1 (ii) a Wherein, the U is S Is an on-load tap-changer level voltage;
the circulation vacuum circuit breaker RV1 is disconnected to generate electric arc; even-numbered stage load current I N F contact flowing through the auxiliary change-over switch S2 and the load current vacuum circuit breaker MV output; the recovery voltage at two ends of the circulation vacuum circuit breaker RV1 is U RV1 ＝U S ；
When the electric arc in the circulation vacuum circuit breaker RV1 is completely extinguished, the movable contact of the action arm of the main change-over switch S1 is changed from b to c fixed contact, and the circulation vacuum circuit breaker RV1 is closed for standby at the same time, and the load current I of even-numbered gears is N And connecting the static contact c of the main change-over switch to a neutral point output through an S1 switch action arm, simultaneously connecting an S2f contact of the auxiliary change-over switch in parallel and outputting a load current breaker MV, finishing the tapping change-over operation and completing the switching of the vacuum on-load tapping switch transition device from an odd gear to an even gear.
When the gears of the on-load tap-changer are in even number tapping, a moving contact of an action arm of a main change-over switch S1 is communicated with a static contact c, and a moving contact of an action arm of an auxiliary change-over switch S2 is communicated with a static contact f; the load current vacuum circuit breaker MV is conducted, the circulation vacuum circuit breakers RV1 and RV2 are conducted, and the load current I N The main change-over switch static contact c is connected to the neutral point output through the S1 switch action arm, and is connected with the f contact of the auxiliary change-over switch S2 and the load current breaker MV output in parallel.
When the tap changer is switched from even gear to odd gear, the switching method of the vacuum on-load tap changer transition device comprises the following steps:
the moving contact of the action arm of the main change-over switch S1 is changed from c to d fixed contact, and even-numbered load current flows through the auxiliary change-over switchAnd S2 and the load current breaker MV are output through the load current breaker MV, and are simultaneously connected with the transition resistor R2 and the circulating current breaker RV2 in parallel and output through a d contact of the main change-over switch S1. Breaking the load current vacuum circuit breaker MV to produce an arc; after the arc is extinguished, the even-numbered stage load current I N Sequentially flows through a transition resistor R2, a circulating current vacuum circuit breaker RV2 and a d contact output of a main change-over switch S1, and the recovery voltage U at the two ends of the load vacuum circuit breaker MV is MV ＝I N ×R2；
When the electric arc in the load current vacuum circuit breaker MV is completely extinguished, the action arm of the auxiliary change-over switch S2 is changed from the fixed contact of the connection f to the fixed contact of the connection e; after the arc in the V is completely extinguished, the action arm of the auxiliary change-over switch S2 is changed from the fixed contact connected with the f to the fixed contact connected with the e, and the even-numbered load current I N And the current flows through a transition resistor R2, a circulation vacuum circuit breaker RV2 and a d contact output of a main change-over switch S1 in sequence.
Closing the load current vacuum circuit breaker MV, transferring the load current from an even gear to an odd gear, connecting the even gear and the odd gear by the transition device simultaneously to form bridging, and generating circulating current
Figure BDA0002596284660000071
Odd-numbered stage load current I N E contact flowing through the auxiliary change-over switch S2 and the load current vacuum circuit breaker MV output; current I flowing through the load current vacuum circuit breaker MV MV ＝I N +I RV2 (ii) a Wherein, the U is s Is an on-load tap-changer stage voltage.
The circulation vacuum circuit breaker RV2 is disconnected to generate electric arc; odd-numbered stage load current I N E contact flowing through the auxiliary change-over switch S2 and the load current vacuum circuit breaker MV output; the recovery voltage at two ends of the circulation vacuum circuit breaker RV2 is U RV2 ＝U S 。
When the arc in the circulation vacuum circuit breaker RV2 is completely extinguished, the movable contact of the action arm of the main change-over switch S1 is changed from d to a fixed contact, and the circulation vacuum circuit breaker RV2 is closed for standby, and the odd-numbered load current I N Is connected to a neutral point through a main change-over switch static contact a and an S1 switch action armAnd (4) outputting, and simultaneously connecting the e contact of the auxiliary change-over switch S2 and the load current breaker MV in parallel. And finishing the tap changing operation, and completing the conversion of the vacuum on-load tap changer transition device from an even gear to an odd gear.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Compared with the prior art, the vacuum type on-load tap-changer transition device has the advantages that only 2 mechanical change-over switches are arranged in a circuit, action parts are reduced, and the complexity of a mechanical structure is reduced; the tasks of passing and cutting off the circulation are alternately borne by two paths of transition resistors R1 and R2 and circulation vacuum circuit breakers RV1 and RV2, and the switching task of only one auxiliary vacuum bubble in the existing topology is shared; and one transition resistor is added, the transition resistors are alternated, so that the temperature rise of the transition resistors can be reduced, the degradation of the decomposition gas generation and the insulation performance of the transformer oil caused by overhigh temperature of the transition resistors is avoided, the electrical service life of the whole switch is greatly prolonged, and the problems of complex mechanical structure and low electrical service life of the vacuum on-load tap-changer of the conventional device are solved.
1. Structure of vacuum on-load tap-changer transition device
The vacuum on-load tap-changer transition device in the embodiment comprises a main change-over switch S1, an auxiliary change-over switch S2, circulating current vacuum circuit breakers RV1 and RV2, a load current vacuum circuit breaker MV and transition resistors R1 and R2.
(1) The main transfer switch S1 has 4 static contacts: a. the electrode c is respectively connected with an odd-numbered stage and an even-numbered stage of a tapping switch tapping selector, the electrodes b and d are respectively connected with two circulating current vacuum circuit breakers RV1 and RV2, the two vacuum circuit breakers are respectively connected with two transition resistors R1 and R2, the odd-numbered stage and the even-numbered stage of the switching switch tapping selector are respectively connected through the transition resistors, the fixed end of an S1 transfer switch action arm is connected with a neutral point of a transformer, and a moving contact can be rotationally and selectively connected with four static contacts a, b, c and d.
(2) The auxiliary transfer switch has 2 static contacts: e. the f electrode is respectively connected with an Odd-numbered stage (Odd Tap) and an Even-numbered stage (Even Tap) of a tapping switch tapping selector, the fixed end of an S2 switch action arm is connected with a neutral point of a transformer through a load current vacuum circuit breaker MV, and a moving contact can be rotatably connected with two fixed contacts e and f.
(3) The circulation vacuum circuit breaker RV1 is configured to cut off circulation between two stages when an odd-numbered stage is switched to an even-numbered stage, and the circulation vacuum circuit breaker RV2 is configured to cut off circulation between two stages when an even-numbered stage is switched to an odd-numbered stage.
(4) The load current vacuum circuit breaker is used for cutting off load current when odd gears are switched to even gears and even gears are switched to odd gears.
(5) When the gears of the on-load tap-changer are in odd-numbered tapping, the moving contact of the action arm of the main change-over switch S1 is conducted with the fixed contact a, and the moving contact of the action arm of the auxiliary change-over switch S2 is conducted with the fixed contact e. The load current vacuum circuit breaker MV is conducted, the circulation vacuum circuit breakers RV1 and RV2 are conducted, and the load current I N The main change-over switch static contact a is connected to the neutral point output through the S1 switch action arm, and is connected with the S2e contact of the auxiliary change-over switch and the load current breaker MV output in parallel.
2. Conversion method of vacuum on-load tap-changer transition device
Assuming that the initial point position of a conversion selector of a tapping selector of the on-load tapping switch is unchanged, and the gear number of the on-load tapping switch is consistent with the contact group number of the tapping selector, the gear of the on-load tapping switch is required to be increased from an odd gear N to an even gear N +1.
When the gear of the on-load tap-changer (i) is in odd-numbered tap-changer, as shown in fig. 1, the moving contact of the action arm of the main change-over switch S1 is conducted with the fixed contact a, and the moving contact of the action arm of the auxiliary change-over switch S2 is conducted with the fixed contact e. The load current vacuum circuit breaker MV is conducted, the circulation vacuum circuit breakers RV1 and RV2 are conducted, and the load current I N The main change-over switch static contact a is connected to the neutral point output through the S1 switch action arm, and is connected with the S2e contact of the auxiliary change-over switch and the load current breaker MV output in parallel.
1. When the tap selector is switched from odd taps to even taps, the specific operation method comprises the following steps:
(1) As shown in fig. 2, the moving contact of the action arm of the main transfer switch S1 is switched from a to b, and the odd-numbered load current I N Flows through the auxiliary change-over switch S2 and the load current breaker MV for output, is connected with the transition resistor R1 and the circulating current breaker RV1 in parallel, and is output through the contact of the main change-over switch S1 b.
(2) As shown in fig. 3, the load current vacuum interrupter MV is opened, generating an arc; after the arc is extinguished, the load current I of odd number gear N Sequentially flows through a transition resistor R1, a circulation vacuum circuit breaker RV1 and a main change-over switch S1b contact for output, and the recovery voltage U at the two ends of the load vacuum circuit breaker MV MV ＝I N ×R1；
(3) As shown in fig. 4, after the arc in the load current vacuum circuit breaker MV is completely extinguished, the operating arm of the auxiliary transfer switch S2 is switched from the e-fixed contact to the f-fixed contact, and the odd-numbered load current I N Sequentially flows through a transition resistor R1, a circulating current vacuum circuit breaker RV1 and a main change-over switch S1b contact for output;
(4) As shown in fig. 5, the load current vacuum circuit breaker MV is closed, and the transition circuit connects the odd-numbered stage and the even-numbered stage at the same time to form a bridge connection, thereby generating a circulating current I RV1 ＝U s R1; at the moment, the load current is transferred from the odd gear to the even gear, and the even gear load current I N Flows through the S2f contact of the auxiliary change-over switch and the output of the load current vacuum circuit breaker MV; current I flowing through the load current vacuum circuit breaker MV MV ＝I N +I RV1 (ii) a Wherein, the U S Is an on-load tap-changer level voltage;
(5) As shown in fig. 6, the circulation vacuum circuit breaker RV1 is opened, generating an arc; even-numbered stage load current I N Flows through the S2f contact of the auxiliary change-over switch and the output of the load current vacuum circuit breaker MV; the recovery voltage at two ends of the circulation vacuum circuit breaker RV1 is U RV1 ＝U S ；
(6) As shown in FIG. 7, after the arc in the circulation vacuum circuit breaker RV1 is completely extinguished, the moving contact of the action arm of the main change-over switch S1 is switched from b to c for static contactHead, simultaneously closed circulation vacuum circuit breaker RV1 for standby, even-numbered gear load current I N The main change-over switch static contact c is connected to the neutral point output through the S1 switch action arm, and is connected with the S2f contact of the auxiliary change-over switch and the load current breaker MV output in parallel. And the tapping conversion operation is finished, and the change-over switch finishes the voltage regulation of converting from the odd gear to the even gear.
2. When the tap selector is switched from odd to even taps, the transition circuit switching sequence is schematically illustrated in fig. 15.
When the gear of the on-load tap-changer (ii) is in even-numbered tap-changer, as shown in fig. 8, the moving contact of the action arm of the main transfer switch S1 is conducted with the fixed contact c, and the moving contact of the action arm of the auxiliary transfer switch S2 is conducted with the fixed contact f. The load current vacuum circuit breaker MV is conducted, the circulation vacuum circuit breakers RV1 and RV2 are conducted, and the load current I N The main change-over switch static contact c is connected to the neutral point output through the S1 switch action arm, and is connected with the S2f contact of the auxiliary change-over switch and the load current breaker MV output in parallel.
1. When the tap selector is switched from even taps to odd taps, the specific operation method comprises the following steps:
(1) As shown in fig. 9, the moving contact of the operating arm of the main transfer switch S1 is switched from c to d, and the even-numbered load current I N Flows through the auxiliary change-over switch S2 and the load current breaker MV for output, is connected with the transition resistor R2 and the circulation circuit breaker RV2 in parallel, and is output through the contact of the main change-over switch S1 d.
(2) As shown in fig. 10, the load current vacuum circuit breaker MV is opened, generating an arc; after the arc is extinguished, the even-numbered load current I N Sequentially flows through a transition resistor R2, a circulation vacuum circuit breaker RV2 and a main change-over switch S1d contact for output, and the recovery voltage U at the two ends of the load vacuum circuit breaker MV MV ＝I N ×R2；
(3) As shown in fig. 11, after the arc in the load current vacuum circuit breaker MV is completely extinguished, the operating arm of the auxiliary transfer switch S2 is transferred from the fixed contact of connection f to the fixed contact of connection e, and the load current I in even-numbered stage is transferred N Sequentially flows through a transition resistor R2, a circulating vacuum circuit breaker RV2 and a main change-over switch S1d contact for output;
(4) As shown in fig. 12, the load current vacuum circuit breaker MV is closed, and the transition circuit connects the even-numbered stage and the odd-numbered stage at the same time to form a bridge connection, thereby generating a circulating current I RV2 ＝U s R2; at the moment, the load current is transferred from even gear to odd gear, and the load current I of odd gear N Flows through the S2e contact of the auxiliary change-over switch and the output of the load current vacuum circuit breaker MV; current I flowing through the load current vacuum circuit breaker MV MV ＝I N +I RV2 (ii) a Wherein, the U S Is an on-load tap-changer level voltage;
(5) As shown in fig. 13, the circulation vacuum breaker RV2 is opened, generating an arc; odd-numbered stage load current I N Flows through the S2e contact of the auxiliary change-over switch and the output of the load current vacuum circuit breaker MV; the recovery voltage at two ends of the circulation vacuum circuit breaker RV2 is U RV2 ＝U S ；
(6) As shown in fig. 14, after the arc in the circulation vacuum circuit breaker RV2 is completely extinguished, the moving contact of the actuating arm of the main transfer switch S1 is switched from d to a fixed contact, and the circulation vacuum circuit breaker RV2 is closed for standby, and the odd-numbered load current I N The main change-over switch static contact a is connected to the neutral point output through the S1 switch action arm, and is connected with the S2e contact of the auxiliary change-over switch and the load current breaker MV output in parallel. And the tapping conversion operation is finished, and the change-over switch finishes the voltage regulation of converting from the even gear to the odd gear.
2. When the tap selector is switched from even to odd taps, the transition circuit switching routine is schematically illustrated in fig. 16.
3. The tasks of the vacuum circuit breaker of the vacuum on-load tap-changer transition device in the embodiment are shown in the following table:
Figure BDA0002596284660000111
wherein N is the number of times of gear shifting of the tap changer, I N Is the load current; us is an on-load tap-changer level voltage; r1 and R2 are transition resistances.
4. Fig. 17 shows a variant embodiment of a load changeover switch according to the present application of an on-load tap changer. The auxiliary contact S2 according to the present application is not designed as a single-arm contact, but as a double-arm contact. This embodiment achieves a force balance of the toggle action arm without changing its function and action.
Finally, it should be noted that: although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the invention.

Claims (8)

1. A vacuum on-load tap changer transition arrangement, comprising: a main transfer switch S1, an auxiliary transfer switch S2, circulation vacuum circuit breakers RV1 and RV2, a load current vacuum circuit breaker MV and transition resistors R1 and R2;
the main change-over switch S1 has four static contacts a, b, c and d; a. the electrodes c are respectively connected with an odd-numbered stage and an even-numbered stage of an on-load tap-changer, the electrodes b and d are respectively connected with circulating current vacuum circuit breakers RV1 and RV2, the circulating current vacuum circuit breakers RV1 and RV2 are respectively connected with transition resistors R1 and R2, the transition resistors R1 and R2 are respectively connected with the odd-numbered stage and the even-numbered stage of the on-load tap-changer, the fixed end of an action arm of a main transfer switch S1 is connected with a neutral point of a transformer, and a moving contact can be rotationally and selectively connected with four static contacts a, b, c and d;
the auxiliary change-over switch S2 has two static contacts of e and f in total; e. the f electrode is respectively connected with odd gears and even gears of a tapping selector of the on-load tapping switch, the fixed end of the action arm of the auxiliary change-over switch S2 is connected with a neutral point of the transformer through a load current vacuum circuit breaker MV, and the moving contact can be rotated to selectively connect two static contacts e and f;
the circulating current vacuum circuit breaker RV1 is used for cutting off circulating current between two gears when the tap switch transition device is switched from an odd gear to an even gear;
the circulating current vacuum circuit breaker RV2 is used for cutting off circulating current between two gears when the tap switch transition device is switched from an even gear to an odd gear;
and the load current vacuum circuit breaker MV is used for cutting off the load current when the tap changer transition device is switched from an odd-numbered gear to an even-numbered gear and/or the even-numbered gear is switched to the odd-numbered gear.
2. The transition device according to claim 1, characterized in that the fixed end of the movable contact of the main transfer switch S1 and one end of the load current vacuum circuit breaker MV are connected to the transformer neutral point to output current.
3. The transition device of claim 1, further comprising:
when the gears of the on-load tap-changer are in odd tapping, a moving contact of an action arm of a main change-over switch S1 is communicated with a fixed contact a, and a moving contact of an action arm of an auxiliary change-over switch S2 is communicated with a fixed contact e;
the load current vacuum circuit breaker MV is conducted, the circulation vacuum circuit breakers RV1 and RV2 are conducted, and the load current I N The static contact a of the main change-over switch S1 is connected to the neutral point output through the action arm of the main change-over switch S1, and meanwhile, the e contact of the auxiliary change-over switch S2 is connected in parallel, and the load current vacuum circuit breaker MV outputs.
4. A method of converting a vacuum on-load tap changer transition set according to claim 1, comprising:
the moving contact of the action arm of the main change-over switch S1 is changed from a to a fixed contact b, the odd-numbered load current flows through the auxiliary change-over switch S2 and the load current vacuum circuit breaker MV and is output through the load current vacuum circuit breaker MV, and simultaneously, the transition resistor R1 and the circulation current vacuum circuit breaker RV1 are connected in parallel and are output through the fixed contact b of the main change-over switch S1;
the load current vacuum circuit breaker MV is disconnected, the load current is cut off, and an electric arc is generated;
when the electric arc in the load current vacuum circuit breaker MV is extinguished, the action arm of the auxiliary change-over switch S2 is changed from the fixed contact of the connection e to the fixed contact of the connection f;
closing the load current vacuum circuit breaker MV, transferring the load current from an odd gear to an even gear, and simultaneously connecting the odd gear and the even gear by the transition device to form bridging and generate circulating current;
the circulation vacuum circuit breaker RV1 is disconnected, circulation current is cut off, and electric arcs are generated;
when the electric arc in the circulation vacuum circuit breaker RV1 is extinguished, the movable contact of the action arm of the main change-over switch S1 is changed from the b position to the c position, and meanwhile, the circulation vacuum circuit breaker RV1 is closed for standby, so that the vacuum on-load tap-changer transition device is changed from the odd number gear to the even number gear.
5. The method according to claim 4, further comprising, after the step when the arc in the load current vacuum circuit breaker MV is extinguished:
odd-numbered load current sequentially flows through the transition resistor R1, the circulating current vacuum circuit breaker RV1 and the b static contact of the main change-over switch S1 to be output.
6. The method of claim 4, further comprising:
when the gears of the on-load tap-changer are in even tapping, a moving contact of an action arm of the main change-over switch S1 is conducted with a fixed contact c, and a moving contact of an action arm of the auxiliary change-over switch S2 is conducted with a fixed contact f;
the load current vacuum circuit breaker MV is conducted, the circulation vacuum circuit breakers RV1 and RV2 are conducted, and the load current I N The fixed contact c of the main change-over switch is connected to the neutral point output through the action arm of the main change-over switch S1, and meanwhile, the f contact of the auxiliary change-over switch S2 and the load current vacuum circuit breaker MV output are connected in parallel.
7. A method of converting a vacuum on-load tap changer transition set according to claim 1, comprising:
the moving contact of the action arm of the main transfer switch S1 is switched from c to d fixed contact, even-numbered load current flows through the auxiliary transfer switch S2 and the load current vacuum circuit breaker MV and is output through the load current vacuum circuit breaker MV, and simultaneously, the transition resistor R2 and the circulating current vacuum circuit breaker RV2 are connected in parallel and are output through the d fixed contact of the main transfer switch S1, so that the load current vacuum circuit breaker MV is disconnected and electric arc is generated;
when the electric arc in the load current vacuum circuit breaker MV is extinguished, the action arm of the auxiliary change-over switch S2 is changed from the fixed contact of the connection f to the fixed contact of the connection e;
closing the load current vacuum circuit breaker MV, and simultaneously connecting the even-numbered gear and the odd-numbered gear by the transition device to form bridging, generating circulating current and transferring the load current from the even-numbered gear to the odd-numbered gear;
disconnecting the circulating current vacuum circuit breaker RV2 to generate electric arc;
when the electric arc in the circulation vacuum circuit breaker RV2 is extinguished, the movable contact of the action arm of the main change-over switch S1 is changed from d to the fixed contact a, and meanwhile, the circulation vacuum circuit breaker RV2 is closed for standby, so that the vacuum on-load tap-changer transition device is changed from an even gear to an odd gear.
8. The method of claim 7, further comprising, after the step when the arc is extinguished in the load current vacuum circuit breaker MV:
even-numbered load current sequentially flows through the transition resistor R2, the circulating current vacuum circuit breaker RV2 and the d static contact of the main change-over switch S1 to be output.
CN202010710305.7A 2020-07-22 2020-07-22 Vacuum on-load tap-changer transition device and switching method of transition device Active CN112071672B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202010710305.7A CN112071672B (en) 2020-07-22 2020-07-22 Vacuum on-load tap-changer transition device and switching method of transition device
PCT/CN2020/130617 WO2022016758A1 (en) 2020-07-22 2020-11-20 Vacuum on-load tap-changer transition device, and switching method for vacuum on-load tap-changer transition device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010710305.7A CN112071672B (en) 2020-07-22 2020-07-22 Vacuum on-load tap-changer transition device and switching method of transition device

Publications (2)

Publication Number Publication Date
CN112071672A CN112071672A (en) 2020-12-11
CN112071672B true CN112071672B (en) 2022-10-04

Family

ID=73656317

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010710305.7A Active CN112071672B (en) 2020-07-22 2020-07-22 Vacuum on-load tap-changer transition device and switching method of transition device

Country Status (2)

Country Link
CN (1) CN112071672B (en)
WO (1) WO2022016758A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113571314A (en) * 2021-07-07 2021-10-29 董跃周 Compact vacuum on-load tap-changer switching mechanism for converter transformer
CN113889329B (en) * 2021-09-26 2023-12-15 上海华明电力设备制造有限公司 On-load tap-changer switching method, circuit and device
CN114783743A (en) * 2022-03-09 2022-07-22 李晓明 Arcless on-load tap-changer, switching control method and electrical equipment

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN205248126U (en) * 2015-12-02 2016-05-18 中国西电电气股份有限公司 Vacuum on -load tap -changer's transition circuit

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2437029Y (en) * 2000-07-24 2001-06-27 王作志 Switching switch for dry type loaded distributing switch
CN101807472B (en) * 2009-02-13 2012-08-08 上海华明电力设备制造有限公司 Vacuum tube group for replacing copper-tungsten contact group of on-load tap changer
CN101923951A (en) * 2009-06-12 2010-12-22 上海华明电力设备制造有限公司 Improved switching mechanism of vacuum on-load tap changer
CN101651029B (en) * 2009-07-30 2011-06-08 上海华明电力设备制造有限公司 Vacuum vessel switching core used by on-load tap-changer
DE102010019949A1 (en) * 2010-05-08 2011-11-10 Maschinenfabrik Reinhausen Gmbh OLTC
DE202010017377U1 (en) * 2010-06-18 2012-01-03 Maschinenfabrik Reinhausen Gmbh OLTC
DE102010053466A1 (en) * 2010-11-30 2012-05-31 Maschinenfabrik Reinhausen Gmbh Step switch and vacuum interrupter for such a tap changer
CN102623202B (en) * 2011-01-30 2015-11-18 上海华明电力设备制造有限公司 A kind of composite vacuum on-load tap-changer changeover module
CN202183304U (en) * 2011-03-11 2012-04-04 上海华齐电力设备制造有限公司 Switching mechanism of vacuum on-load tap changing switch
JP6081082B2 (en) * 2012-05-18 2017-02-15 株式会社東芝 Load tap changer
CN102779667B (en) * 2012-07-21 2014-10-22 山东大学 On-load tap-changer
CN204230109U (en) * 2014-12-12 2015-03-25 国家电网公司 A kind of vacuum type on load tap changer transition circuit
CN107248461A (en) * 2017-07-21 2017-10-13 上海华明电力设备制造有限公司 A kind of authentic vacuole switching circuit of vacuum on-load operation switch
CN210865956U (en) * 2019-11-30 2020-06-26 上海华齐电力设备制造有限公司 Switching mechanism of combined vacuum on-load tap-changer

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN205248126U (en) * 2015-12-02 2016-05-18 中国西电电气股份有限公司 Vacuum on -load tap -changer's transition circuit

Also Published As

Publication number Publication date
WO2022016758A1 (en) 2022-01-27
CN112071672A (en) 2020-12-11

Similar Documents

Publication Publication Date Title
CN112071672B (en) Vacuum on-load tap-changer transition device and switching method of transition device
KR20070078691A (en) On-load tap changer
CN104465168A (en) Transition circuit of vacuum type on-load tap-changer and operation method
CN111799075A (en) Double-resistor transition circuit of vacuum on-load tap-changer and voltage regulation method
CN112670067B (en) Symmetrical vacuum bubble load balancing transition circuit device and control method
CN112670068B (en) Transition circuit device with vacuum on-load tap-changer and control method
CN115763112A (en) Symmetrical reciprocating transition circuit and voltage regulating method for converter transformer on-load voltage regulating switch
CN112216494A (en) On-load tap-changer and operation control method thereof
CN215220484U (en) Tap switch circuit with asymmetric mechanical contact time sequence
CN114446622A (en) Single-isolation contact transition circuit of on-load tap-changer and voltage regulation method
CN113851312A (en) On-load tap-changer reciprocating type transition circuit and voltage regulation method
CN112670066B (en) Transition circuit device and method for alternately bearing symmetrical vacuum bubbles
CN219418739U (en) Tapping conversion transition topology module of change-over switch of vacuum on-load tapping switch
CN210469151U (en) Interleaved parallel seven-gear transformer on-load voltage regulation circuit with polarity conversion
CN215680377U (en) Single-resistance transition circuit of on-load tap-changer
CN217606718U (en) Vacuum on-load tap-changer transition circuit
CN214203439U (en) Vacuum on-load tap-changer transition circuit with isolation contact
CN215680376U (en) On-load tap-changer reciprocating transition circuit
CN215680465U (en) Double-resistor symmetrical transition circuit of on-load tap-changer
CN114093594A (en) Transition circuit of on-load tap-changer and control method
CN215680375U (en) Single-resistor symmetrical transition circuit of on-load tap-changer
CN213094175U (en) Transformer on-load tap-changer
CN111986902A (en) Vacuum on-load tap-changer transition circuit with isolation contact and voltage regulation method
CN215680464U (en) On-load tap-changer transition circuit without conversion contact
CN111799076A (en) Single-resistor alternating type transition circuit of vacuum on-load tap-changer and voltage regulation method

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant