CN108847342B - Transformer vacuum pressure regulating system for rural power grid irrigation - Google Patents

Transformer vacuum pressure regulating system for rural power grid irrigation Download PDF

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Publication number
CN108847342B
CN108847342B CN201810697650.4A CN201810697650A CN108847342B CN 108847342 B CN108847342 B CN 108847342B CN 201810697650 A CN201810697650 A CN 201810697650A CN 108847342 B CN108847342 B CN 108847342B
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China
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vacuum
phase
circuit breaker
winding
vacuum circuit
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CN201810697650.4A
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CN108847342A (en
Inventor
孟永剑
黄豪策
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Faraday Electric Co ltd
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Zhejiang Farady Electric Co ltd
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    • 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
    • H01F27/28—Coils; Windings; Conductive connections
    • 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
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/29—Terminals; Tapping arrangements for signal inductances
    • 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
    • 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
    • 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
    • H01F29/025—Constructional details of transformers or reactors with tapping on coil or windings
    • 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

Abstract

The invention relates to the technical field of rural power grid irrigation transformers, in particular to a vacuum voltage regulating system of a rural power grid irrigation transformer. The system comprises a transformer, a controller, a three-phase reactor and vacuum circuit breakers, wherein the high-voltage side winding of the transformer is provided with at least 5-gear taps, each vacuum circuit breaker comprises two vacuum bubbles, two pairs of auxiliary contact normally closed contacts and a signal input line, two outgoing lines of one vacuum bubble are connected with the same-gear taps of the phase-A winding and the phase-B winding, two outgoing lines of the other vacuum bubble are connected with the same-gear taps of the phase-B winding and the phase-C winding, and the signal input line of the vacuum circuit breaker is connected with the controller; the three-phase reactor is connected in series at the rated gear of the three-phase winding, and the connecting wires of the three-phase reactor, the A-phase winding and the C-phase winding are connected in series with the auxiliary contact normally closed contact of the vacuum circuit breaker. The invention uses the vacuum circuit breaker and the controller to replace the no-load switch, can realize the automatic voltage regulation of the transformer, and the invention is provided with the three-phase reactor, and can restrain the short-circuit current when the vacuum circuit breaker is switched.

Description

Transformer vacuum pressure regulating system for rural power grid irrigation
Technical Field
The invention relates to the technical field of rural power grid irrigation transformers, in particular to a vacuum voltage regulating system of a rural power grid irrigation transformer.
Background
In remote areas of China, the farm area is wide, agricultural irrigation must be supported by means of electric facilities, and because the farm is too large, each area needs to be provided with one transformer, so that the use amount of the transformers is large. Moreover, most farms are remote, electric energy can be transmitted to the farms through long lines from main transformer stations in urban areas, and a large number of transformers pass through the power transmission farms, so that the output voltage of the transformers is far lower than the rated voltage of a normal transformer, the output voltage is unstable, and the fluctuation is large. The voltage is lower than the working voltage of the irrigation motor, which can cause the working current of the motor to increase, the rotating speed to decrease, the temperature to rise and even cause the motor to burn out when the temperature is serious.
The high-voltage side of the transformer for rural power network irrigation generally adopts a Y connection method, and the Yyn0 with small capacity and low cost is most commonly connected with a group transformer. In order to overcome the problems, a voltage regulating system is generally arranged on a transformer for agricultural irrigation, the commonly used voltage regulating modes comprise on-load voltage regulation and no-load voltage regulation, and the on-load switch required by the on-load voltage regulation is too high in price, so that the cost is far higher than that of a small-capacity transformer, and the transformer is large in size and cannot be popularized in the field of agricultural irrigation. At present, agricultural irrigation is more commonly used to be unloaded transformer, and this transformer adopts unloaded pressure regulating tap, when needs adjust the transformer low-voltage side voltage, just can adjust the tap after needing to stop the transformer. And can not discover in time that the voltage is low state excessively, even discover, also need the power failure after, can shift gears, influence normal irrigation efficiency.
Disclosure of Invention
In order to solve the problems of the no-load transformer, the invention provides a novel voltage regulating system of the transformer for rural power grid irrigation, wherein an automatic voltage regulating system is constructed by utilizing a vacuum circuit breaker and a controller, and a three-phase reactor is utilized to inhibit short-circuit current generated in the gear shifting process.
The concrete implementation scheme of the inventive concept is as follows:
a transformer vacuum pressure regulating system for rural power grid irrigation comprises a transformer, wherein a high-voltage side winding of the transformer is connected in a Y mode, each phase winding is provided with at least 5-gear taps, the transformer vacuum pressure regulating system further comprises a controller, a three-phase reactor and vacuum circuit breakers arranged in one-to-one correspondence with the gears, each vacuum circuit breaker comprises two vacuum bubbles, two pairs of auxiliary contact normally closed contacts and a signal input line, two outgoing lines of one vacuum bubble are connected with the taps at the same gear of the phase A winding and the phase B winding, two outgoing lines of the other vacuum bubble are connected with the taps at the same gear of the phase B winding and the phase C winding, and the signal input line of the vacuum circuit breaker is connected with the controller and used for receiving closing and opening signals to control connection or disconnection of the corresponding gear taps to realize automatic pressure; the three-phase reactor is connected in series with the middle gear of the three-phase winding, one pair of auxiliary contact normally-closed contacts of each vacuum circuit breaker is connected in series with the middle gear of the A-phase winding, the other pair of auxiliary contact normally-closed contacts of each vacuum circuit breaker is connected in series with the middle gear of the C-phase winding, and the three-phase reactor is connected with the middle gear of the B-phase winding through a lead, so that when the main contact of any vacuum circuit breaker is closed, the auxiliary contact normally-closed contacts are disconnected, and the three-phase reactor is disconnected; when the main contact of the vacuum circuit breaker is disconnected, the normally closed contact of the auxiliary contact is closed, the three-phase reactor is switched on, and the short-circuit current is restrained.
The vacuum circuit breaker with two vacuum bubbles is connected with the tap joint of the same gear, and the tap joint is controlled to be connected or disconnected through the controller, so that gear switching is completed. Compared with an on-load voltage regulating transformer, the mode has the advantages of low cost, small occupied space, no power failure operation, simple and easy operation of the voltage regulating process, automatic control of gear switching and realization of automatic voltage regulation. In order to prevent two groups of vacuum bubbles from generating electric arcs due to too large potential difference in the gear switching process, the invention adds a three-phase reactor in a circuit, the three-phase reactor is connected in series at a middle gear (namely a rated gear, corresponding to rated voltage), and an auxiliary contact normally closed contact of the vacuum circuit breaker is connected in series on a connecting circuit of the three-phase reactor, so that the three-phase reactor is matched with the opening and closing process of the contact in the vacuum bubble of the vacuum circuit breaker. When any vacuum circuit breaker operates, the auxiliary contact in the vacuum circuit breaker is normally closed, and the three-phase reactor is in an open circuit state. When the vacuum circuit breaker is disconnected in a power-off mode, the auxiliary contact normally-closed contacts are closed, the connecting circuit of the three-phase reactor and the intermediate gear is connected, and the rated voltage is transited, so that the potential difference is not too large, the short-circuit current is restrained, and the vacuum circuit breaker cannot be completely opened in the switching process.
The vacuum circuit breaker further comprises an electromagnetic operating mechanism, wherein the electromagnetic operating mechanism comprises a magnet, a plate linkage mechanism, a first spring and an excitation coil, the magnet is connected with the movable conducting rods of the two vacuum bubbles through the plate linkage mechanism, one side of the magnet is connected with the first spring and is opposite to the magnet in the excitation coil, and the excitation coil is used for attracting the magnet when the vacuum circuit breaker is switched on to drive contacts in the vacuum bubbles to be closed; the first spring is used for pushing the magnet to reset when the brake is opened, and driving the contacts in the vacuum bulb to separate. The vacuum circuit breaker utilizes the electromagnetic operating mechanism to electrify the excitation coil by receiving switching-on and switching-off signals of the controller so as to generate magnetic force; when the switch is switched on, the magnetic force applied to the magnet by the excitation coil is larger than that of the first spring, so that the vacuum bubble movable conducting rod can be pushed to close the movable contact and the fixed contact inside the vacuum bubble movable conducting rod; during the separating brake, the excitation coil produces reverse electromagnetic quantity and lets magnet lose magnetism to under the effect of first spring, make magnet get back to the normal position, the electrically conductive pole is moved in the pulling simultaneously, makes movable contact and stationary contact separation.
Preferably, the first spring is located at the center of the magnet, and the excitation coil comprises two coils, which are respectively located at two sides of the first spring and symmetrically arranged relative to the first spring. The magnet exciting coils symmetrically arranged at the two ends of the magnet act on the magnet, so that large attraction can be provided, the force is applied uniformly, and the attraction effect is improved.
Further, the plate linkage mechanism comprises a bottom plate and a side plate, one end of the bottom plate is vertically connected with the side plate, the magnet is fixed at the bottom of the bottom plate, and the side plate is connected with the tail ends of the movable conducting rods of the two vacuum bubbles.
In order to realize the function of the three-phase reactor, an auxiliary contact part in the vacuum circuit breaker is needed, and the structure is as follows: the vacuum circuit breaker is also internally provided with at least one group of auxiliary contacts and a second spring, a bottom plate of the plate linkage mechanism is provided with a protruding pressing plate at a position close to the auxiliary contacts for pressing down the auxiliary contacts when the magnet is attracted, and the second spring is positioned between the auxiliary contacts and the vacuum circuit breaker shell and used for resetting the auxiliary contacts; the auxiliary contact normally closed contact is arranged on the auxiliary contact and moves up and down along with the auxiliary contact to realize opening and closing of the contact. The normally closed contact of the auxiliary contact is opposite to the opening and closing direction of the main contact, so that the normally closed contact of the auxiliary contact is disconnected when the main contacts of the vacuum circuit breakers in the same group are closed, and the normally closed contact of the auxiliary contact is closed when the main contacts are separated, so that a three-phase reactor circuit is switched on. Still be equipped with at least a pair of auxiliary contact normally open contact on the auxiliary contact, be convenient for connect other components and parts, provide multiple functions.
The invention mainly solves the problems of the conventional no-load transformer with 5 gears, so that each phase winding is preferably provided with a 5-gear tap, a three-phase reactor is arranged at a 3-gear position, and the 3-gear position is the rated gear position of the transformer and is the normal gear position required by customers. The invention can also be extended to more odd-numbered gears, such as 7 gears, 9 gears and the like, thereby basically achieving the level of the on-load tap changer.
The invention uses the vacuum circuit breaker and the controller to replace the no-load switch, can realize the automatic voltage regulation of the transformer, has the cost far lower than that of an on-load voltage regulation transformer, and can be popularized in the field of agricultural irrigation. Meanwhile, the three-phase reactor is arranged, so that short-circuit current can be inhibited when the vacuum circuit breaker is switched, and the service life of equipment is prolonged.
Drawings
Fig. 1 is a schematic wiring diagram of a vacuum circuit breaker and a three-phase reactor according to the present invention;
fig. 2 is a schematic view of a connection structure of a vacuum circuit breaker and a three-phase winding;
FIG. 3 is a schematic diagram of the connection of the vacuum interrupter to the controller;
fig. 4 is a front view of the vacuum circuit breaker;
fig. 5 is a left side sectional view of the vacuum circuit breaker in an open state;
fig. 6 is a left side sectional view of a closing state of the vacuum circuit breaker;
fig. 7 is a schematic diagram of the action process of the normally closed contact and the normally open contact of the auxiliary contact in the switching process of the vacuum circuit breaker;
FIG. 8 is a schematic diagram of a three-phase reactor in an open state;
FIG. 9 is a schematic diagram of the on state of a three-phase reactor;
FIG. 10 is a control flow diagram of the present invention;
in the figure, 1, a vacuum circuit breaker, 2, a tap, 3, a vacuum bulb, 4, an auxiliary contact normally closed contact, 5, a three-phase reactor, 6, a controller, 7, a shell, 8, a plate linkage mechanism bottom plate, 9, a pressing plate, 10, an auxiliary contact, 11, an auxiliary contact normally open contact, 12, a second spring, 13, a first spring, 14, an excitation coil, 15, a magnet, 16 and a plate linkage mechanism side plate.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
A vacuum voltage regulating system of a transformer for rural power grid irrigation comprises a Yyn0 connected transformer, and 5-gear taps 2 are respectively arranged on three-phase windings on the high-voltage side of the transformer. As shown in fig. 1, the system further includes 5 vacuum circuit breakers 1, 1 controller 6, and 1 three-phase reactor 5, wherein the 5 vacuum circuit breakers 1 are respectively arranged corresponding to 5 taps, and the three-phase reactor 5 is connected in series at the 3 taps. The vacuum circuit breaker 1 comprises 2 vacuum bubbles 3, 1 electromagnetic operating mechanism and 1 group of signal input lines (closing, opening and public ends). Each vacuum bubble 3 is provided with 2 leading-out wires which are respectively connected with a static conducting rod and a movable conducting rod inside the vacuum bubble so as to be connected with a static contact and a movable contact. As shown in fig. 2, two outgoing lines of one vacuum bubble of the same vacuum circuit breaker are respectively connected to the taps of the a-phase high-voltage winding and the B-phase high-voltage winding, and two outgoing lines of the other vacuum bubble are respectively connected to the taps of the B-phase high-voltage winding and the C-phase high-voltage winding.
As shown in fig. 3, the controller 6 is provided with 5 sets of outputs, each set includes three terminals of a closing terminal, an opening terminal and a common terminal, and the three terminals are respectively and correspondingly connected to the signal input terminals of the vacuum circuit breakers and are used for outputting closing and opening control signals to the vacuum circuit breakers.
As shown in fig. 4, 5 and 6, the electromagnetic operating mechanism includes a magnet 15, a plate linkage mechanism, a first spring 13 and two magnet exciting coils 14, the plate linkage mechanism includes a bottom plate 8 and a side plate 16, one end of the bottom plate 8 is vertically connected with the bottom of the side plate 16, the magnet 15 is fixed at the bottom of the bottom plate, the side plate 16 is connected with the movable conducting rods of the two vacuum bubbles 3, one end of the first spring 13 is connected in the middle of the magnet 15, the other end of the first spring is connected with the circuit breaker housing, the two magnet exciting coils are symmetrically arranged at two sides of the first spring, and the magnet 15 is opposite to the magnets in. When the magnet exciting coil receives a closing signal, the magnet in the magnet exciting coil generates magnetism, the magnetic force on the magnet is increased, the magnet overcomes the supporting force of the first spring and is attracted with the magnet in the magnet exciting coil, and the magnet pushes the movable conducting rod through the plate linkage mechanism to close the movable contact and the static contact. When the magnet exciting coil receives a brake-separating signal, the magnet exciting coil generates reverse magnetic flux, the magnetic force on the magnet disappears, the magnet returns to the original position under the action of the first spring, and meanwhile, the movable conducting rod is pulled to separate the movable contact from the static contact.
As shown in fig. 4 and 7, two sets of auxiliary contacts 10 and second springs 12 are further disposed in the vacuum circuit breaker, each auxiliary contact 10 is connected to a pair of normally closed contacts 4 and a pair of normally open contacts 11, the two auxiliary contacts 10 are disposed side by side with the two excitation coils, and the second springs 12 are disposed between the auxiliary contacts and the vacuum circuit breaker housing. Two protruding pressing plates 9 are arranged on the front side of the bottom plate of the plate linkage mechanism and correspond to the positions of the two auxiliary contacts. When the excitation coil is electrified, the magnet is attracted, and the bottom plate of the plate linkage mechanism is driven to move downwards, so that the pressure plate presses the auxiliary contact downwards, the normally closed contact is opened, and the normally open contact is closed; when the magnet exciting coil is de-energized, the auxiliary contact gradually returns under the action of the second spring, the normally closed contact is closed firstly, and then the normally open contact is opened.
As shown in fig. 1, 5 auxiliary contact normally-closed contacts 4 of a vacuum circuit breaker are connected in series on a connecting line of a three-phase reactor and a middle gear of each phase winding. The vacuum circuit breaker is in an inoperative state, and 5 pairs of normally closed contacts are in a closed state. When any vacuum circuit breaker receives a closing signal, the corresponding tap is connected, and the voltage is adjusted to the corresponding gear, after the main contact of the vacuum circuit breaker is closed, the normally closed contact of the auxiliary contact is disconnected, and the three-phase reactor is in an open circuit state, as shown in fig. 8. And when the vacuum circuit breaker is opened and disconnected, the normally closed contact of the auxiliary contact is closed, and a three-phase reactor is switched on, as shown in figure 9.
As shown in fig. 10, the controller detects the secondary side voltage to analyze which vacuum circuit breaker needs to be turned on, and when the voltage is at a rated value, the 3 rd-gear vacuum circuit breaker is started; when the line voltage is lower than the rated voltage, the controller needs to send a brake-off signal to the 3-gear vacuum circuit breaker and send a brake-on signal to the 1-gear or 2-gear vacuum circuit breaker when downshifting is needed. The 3-gear vacuum circuit breaker is firstly switched off, the main contact is switched off, the auxiliary contact normally-closed contact is closed, the three-phase reactor line is switched on, the intermediate gear voltage is firstly switched, then the 1-gear or 2-gear vacuum circuit breaker is switched on, the main contact is closed, the auxiliary contact normally-closed contact is opened, and the three-phase reactor is enabled to return to the open-circuit state. When the secondary voltage is higher than the rated voltage, the gear is shifted up, and the operation process is the same. The switching process of the shifting vacuum circuit breaker is completed in the mode, and the potential difference during switching can be reduced, so that the short-circuit current is restrained.

Claims (7)

1. The utility model provides a rural power grids are irrigated with transformer vacuum voltage regulation system, includes a transformer, transformer high pressure side winding adopts Y to connect, and every phase winding is equipped with 5 shelves at least taps, its characterized in that: the vacuum circuit breakers comprise two vacuum bubbles, two pairs of auxiliary contact normally closed contacts and signal input lines, wherein two outgoing lines of one vacuum bubble are connected with the same-gear taps of the phase-A winding and the phase-B winding, two outgoing lines of the other vacuum bubble are connected with the same-gear taps of the phase-B winding and the phase-C winding, and the signal input line of the vacuum circuit breaker is connected with the controller and used for receiving switching-on and switching-off signals and controlling the connection or disconnection of the corresponding gear taps to realize automatic voltage regulation; the three-phase reactor is connected in series with the middle gear of the three-phase winding, one pair of auxiliary contact normally-closed contacts of each vacuum circuit breaker is connected in series with the middle gear of the A-phase winding, the other pair of auxiliary contact normally-closed contacts of each vacuum circuit breaker is connected in series with the middle gear of the C-phase winding, and the three-phase reactor is connected with the middle gear of the B-phase winding through a lead, so that when the main contact of any vacuum circuit breaker is closed, the auxiliary contact normally-closed contacts are disconnected, and the three-phase reactor is disconnected; when the main contact of the vacuum circuit breaker is disconnected, the normally closed contact of the auxiliary contact is closed, the three-phase reactor is switched on, and the short-circuit current is restrained.
2. The rural power network irrigation transformer vacuum pressure regulating system according to claim 1, characterized in that: the vacuum circuit breaker also comprises an electromagnetic operating mechanism, wherein the electromagnetic operating mechanism comprises a magnet, a plate linkage mechanism, a first spring and an excitation coil, the magnet is connected with the movable conducting rods of the two vacuum bubbles through the plate linkage mechanism, one side of the magnet is connected with the first spring and is opposite to the magnet in the excitation coil, and the excitation coil is used for attracting the magnet when the vacuum circuit breaker is switched on to drive contacts in the vacuum bubbles to be closed; the first spring is used for pushing the magnet to reset when the brake is opened, and driving the contacts in the vacuum bulb to separate.
3. The rural power network irrigation transformer vacuum pressure regulating system according to claim 2, characterized in that: the first spring is located the magnet center, and excitation coil includes two, is located the both sides of first spring respectively and relative first spring symmetry sets up.
4. The rural power network irrigation transformer vacuum pressure regulating system according to claim 2, characterized in that: the plate linkage mechanism comprises a bottom plate and a side plate, one end of the bottom plate is vertically connected with the side plate, the magnet is fixed at the bottom of the bottom plate, and the side plate is connected with the tail ends of the movable conducting rods of the two vacuum bubbles.
5. The rural power network irrigation transformer vacuum pressure regulating system according to claim 4, characterized in that: the vacuum circuit breaker is also internally provided with at least one group of auxiliary contacts and a second spring, a bottom plate of the plate linkage mechanism is provided with a protruding pressing plate at a position close to the auxiliary contacts for pressing down the auxiliary contacts when the magnet is attracted, and the second spring is positioned between the auxiliary contacts and the vacuum circuit breaker shell and used for resetting the auxiliary contacts; the auxiliary contact normally closed contact is arranged on the auxiliary contact and moves up and down along with the auxiliary contact to realize opening and closing of the contact.
6. The rural power network irrigation transformer vacuum pressure regulating system according to claim 5, characterized in that: and at least one pair of auxiliary contact normally open contacts is also arranged on the auxiliary contacts.
7. The rural power network irrigation transformer vacuum pressure regulating system according to claim 1, characterized in that: each phase winding is provided with 5-gear taps, and the three-phase reactor is arranged at 3 gears.
CN201810697650.4A 2018-06-29 2018-06-29 Transformer vacuum pressure regulating system for rural power grid irrigation Active CN108847342B (en)

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Application Number Priority Date Filing Date Title
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CN108847342B true CN108847342B (en) 2021-06-22

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2243710Y (en) * 1995-06-29 1996-12-25 徐志勇 Adjustable three phase self-coupling voltage transformer
CN204230166U (en) * 2014-10-20 2015-03-25 李聪 A kind of contactor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2243710Y (en) * 1995-06-29 1996-12-25 徐志勇 Adjustable three phase self-coupling voltage transformer
CN204230166U (en) * 2014-10-20 2015-03-25 李聪 A kind of contactor

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Address after: 325000 Xiangyang Industrial Zone, Liushi Town, Yueqing City, Wenzhou City, Zhejiang Province (within Hongbao Electric Group Co., Ltd.)

Patentee after: Faraday Electric Co.,Ltd.

Address before: 325000 Xiangyang Industrial Zone, Liushi Town, Yueqing City, Wenzhou City, Zhejiang Province (within Hongbao Electric Group Co., Ltd.)

Patentee before: ZHEJIANG FARADY ELECTRIC CO.,LTD.