CN113644660A - Automatic voltage stabilizer for transformer - Google Patents
Automatic voltage stabilizer for transformer Download PDFInfo
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- CN113644660A CN113644660A CN202110940862.2A CN202110940862A CN113644660A CN 113644660 A CN113644660 A CN 113644660A CN 202110940862 A CN202110940862 A CN 202110940862A CN 113644660 A CN113644660 A CN 113644660A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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Abstract
The invention relates to the technical field of electric power, in particular to an automatic voltage stabilizing device of a power transformer, and more particularly relates to an automatic voltage stabilizing device of a transformer.
Description
Technical Field
The invention relates to the field of power technology, in particular to an automatic voltage stabilizing device of a transformer.
Background
The transformer is an important device for power distribution of a power grid, and the problem of power supply shortage needs to be solved urgently when various regions in the world are in the peak period of power construction at present. In order to relieve the situation of short power supply, power companies in various regions around the world increase the total length of a power transmission line, increase the investment scale of power grid construction, further expand the transformation capacity, provide a wide development space for the transformer industry, and promote the good development of the transformer manufacturing industry.
Voltage quality issues include the following:
voltage deviation: the operation voltage value is within the range of +/-10% of the rated voltage value;
under voltage: voltage variation of operating voltage value within 90-80% of rated voltage value and lasting for more than 1 minute;
③ overvoltage: the voltage variation of the operating voltage value, which is in the range of 110-120% of the rated voltage value and lasts for more than 1 minute;
fourthly, short-time undervoltage, wherein the time range is 3 seconds to 1 minute;
short-time overvoltage, wherein the time range is 3 seconds to 1 minute;
sixthly, temporary overvoltage is carried out, wherein the time range is 60 milliseconds to 3 seconds;
seventhly, temporarily undervoltage, wherein the time range is 60 milliseconds to 3 seconds;
the instantaneous overvoltage is in the time range of 10-60 milliseconds;
ninthly, instantaneous under-voltage, wherein the time range is 10-60 milliseconds;
the three-phase voltage at the r is unbalanced. The unevenness of the three-phase voltage is more than or equal to 2 percent and the short time is more than or equal to 4 percent.
According to the safety voltage requirement of the electric equipment, the voltage difference change of the end voltage of the electric equipment is +/-5%, some requirements are higher, the voltage difference change of the end voltage of the electric equipment is less than or equal to 2.5% and the unbalance degree of the three-phase voltage is less than or equal to 2.6%.
The main voltage regulating transformers on the market at present have 3: the transformer comprises a constant magnetic flux voltage regulating transformer, a variable magnetic flux voltage regulating transformer and an on-load voltage regulating transformer. Firstly, the constant magnetic flux voltage regulating transformer adopts the adjustment of the number of turns of a high-voltage winding to change the transformation ratio relation between the high-voltage winding and a low-voltage winding so as to realize the stability of output voltage. It has the advantages of low price, reliable performance, and no synchronous adjustment along with the voltage change, and can only be adjusted after power failure. Secondly, the variable magnetic flux voltage regulating transformer adopts the adjustment of the number of turns of the low-voltage winding to change the transformation ratio relation between the high-voltage winding and the low-voltage winding so as to realize the stability of output voltage. It has low cost and reliable performance, and can not be synchronously regulated with the change of voltage, and can only be regulated after power failure. And thirdly, the on-load tap changing transformer adopts a multi-tap excitation winding to be connected in series with the high-voltage winding, and the tap of the excitation winding is adjusted to change the transformation ratio of the high-voltage winding and the low-voltage winding so as to actually output the stable voltage. However, the on-load tap changer is difficult to avoid arcing during voltage regulation, and therefore requires frequent maintenance.
Disclosure of Invention
In order to solve the technical problems, the invention provides a series of automatic voltage stabilizing devices of the power transformer, which have simple operation, safety and reliability, high voltage regulating speed of less than or equal to 10 milliseconds, wide input voltage of more than or equal to 125 percent and 75 percent of rated voltage value, high output voltage precision of less than or equal to 2 percent, continuous safe operation time of less than or equal to 1 ten thousand hours, uninterrupted automatic bypass function, real-time automatic monitoring function and the like. The series of automatic voltage stabilizing devices of the power transformers are divided into an automatic voltage stabilizing device for class I power transformers, an automatic voltage stabilizing device for class II combined power transformers, an automatic voltage stabilizing device for class III power transformers and an automatic voltage stabilizing device for class IV combined power transformers, wherein the class I comprises a class I distribution transformer voltage stabilizing device, a class I enveloping coil transformer voltage stabilizing device, a class I split transformer voltage regulating device, a class I iv double-winding transformer voltage stabilizing device, a class I v double-winding transformer automatic voltage regulating device and a class I vi transformer voltage stabilizing device, the class II comprises a class II i distribution transformer voltage regulating device, a class II ii distribution transformer automatic voltage stabilizing device, a class I enveloping coil transformer voltage regulating device, a class II iv double-winding transformer voltage regulating device, a class II transformer voltage regulating device, a class III double-winding transformer voltage regulating device, III ii transformer automatic voltage regulation device, III iii transformer voltage regulation device, IV class includes IVi transformer automatic voltage regulator, IVii double winding transformer automatic voltage regulator, IViii double winding transformer voltage regulation device.
The applicant finds that the first constant flux regulating transformer and the second variable flux regulating transformer can not be synchronously adjusted along with the voltage change, and can only be adjusted after power failure, so that the use of the transformer is troublesome and can not play an effective voltage stabilizing role, and also finds that the excitation current of the transformer is increased when the voltage is increased, so that the magnetic induction intensity B in an iron core is increased, the iron loss is increased, and the temperature rise of the iron core promotes the accelerated insulation aging of a winding. The on-load tap changer is easy to generate electric arc when adjusting voltage, and the phenomenon that short-time undervoltage of power supply can be caused if the on-load tap changer is not frequently overhauled is further found, so that advanced electric equipment stops working or is damaged, even voltage breakdown of a power supply system can be caused, and disorder is caused to production operation and working life of the power utilization area.
The technical scheme of IVi of the invention is a transformer automatic voltage stabilizing device which comprises a transformer and a plurality of groups of 3X voltage compensators and is applied to various voltage grade classifications, various cooling classifications, various shell classifications and various connection classifications and three-phase voltage synchronous regulation classifications except a series of power transformer automatic voltage stabilizing devices described in the abstract specification. The transformer further comprises a transformer high-voltage coil R1, a transformer high-voltage coil R2, a transformer high-voltage coil S1, a transformer high-voltage coil S2, a transformer high-voltage coil T1, a transformer high-voltage coil T2, a transformer low-voltage coil R1, a transformer low-voltage coil R2, a transformer low-voltage coil R3, a transformer low-voltage coil R4, a transformer low-voltage coil S1, a transformer low-voltage coil S2, a transformer low-voltage coil S3, a transformer low-voltage coil S4, a transformer low-voltage coil T1, a transformer low-voltage coil T2, a transformer low-voltage coil T3, a transformer low-voltage coil T4, a plurality of sets of transformer tuning coils A1, a transformer tuning coil A2, a transformer tuning coil B1, a transformer tuning coil B2, a transformer tuning coil C1 and a transformer tuning coil C2. The 3X voltage compensator is a three-phase voltage compensator combined by three single-phase voltage compensators, and further comprises a 3X voltage compensator coil TX1, a 3X voltage compensator coil TX2, a 3X voltage compensator coil TY1, a 3X voltage compensator coil TY2, a 3X voltage compensator coil TZ1, a 3X voltage compensator coil TZ2, a 3X voltage compensator coil TX1, a 3X voltage compensator coil TX2, a 3X voltage compensator coil TY1, a 3X voltage compensator coil TY2, a 3X voltage compensator coil TZ1 and a 3X voltage compensator coil TZ 2. Preferably, the transformer tuning coil A1 is connected to transformer tuning coil B1 and transformer tuning coil C1, the transformer tuning coil a2 is connected to the 3X voltage compensator coil X2, the transformer tuning coil B2 is connected to the 3X voltage compensator coil Y2, the transformer tuning coil C2 is connected to the 3X voltage compensator coil TZ2, the 3X voltage compensator coil TX1 is connected to the 3X voltage compensator coil TY1 and the 3X voltage compensator coil TZ1 are also connected to the transformer tuning coil TA1, the transformer tuning coil B1 and the transformer tuning coil C1, the 3X voltage compensator coil tx1 is connected to a 3X voltage compensator coil ty2, the 3X voltage compensator coil ty1 is connected to a 3X voltage compensator coil tz2, the 3X voltage compensator coil tz1 is connected to the 3X voltage compensator coil tx 2.
Preferably, the power supply further comprises a triac VTA1, a triac VTA2, a triac VTB1, a triac VTB2, a triac VTC1 and a triac VTC2, wherein the triac VTA1 is connected between a 3X voltage compensator coil tx1 and a 3X voltage compensator coil tx2, the triac VTB1 is connected between the 3X voltage compensator coil ty1 and a 3X voltage compensator coil ty2, the triac VTC1 is connected between a 3X voltage compensator coil tz1 and a 3X voltage compensator coil tz2, one end of the triac VTA2 is connected to the 3X voltage compensator coil tx2, one end of the triac VTB2 is connected to the 3X voltage compensator coil tz2, and one end of the triac VTC2 is connected to the 3X voltage compensator coil tz 2.
It is preferred. Still include control protection switch Q1, control protection switch Q2, control protection switch Q3, the one end of control protection switch Q1 is connected in the other end of bidirectional thyristor VTA2, the one end of control protection switch Q2 is connected in the other end of bidirectional thyristor VTB2, the one end of control protection switch Q3 is connected in the other end of bidirectional thyristor VTC 2.
Preferably, the protection circuit further comprises a single-phase self-coupling step-down transformer A, a single-phase self-coupling step-down transformer B and a single-phase self-coupling step-down transformer C, wherein the single-phase self-coupling step-down transformer A is connected to the other end of the control protection switch Q1, the single-phase self-coupling step-down transformer B is connected to the other end of the control protection switch Q2, the single-phase self-coupling step-down transformer C is connected to the other end of the control protection switch Q3, the other end of the single-phase self-coupling step-down transformer A is connected to the A-phase voltage combination winding, the other end of the single-phase self-coupling step-down transformer B is connected to the C-phase voltage combination winding, and the other end of the single-phase self-coupling step-down transformer C is connected to the C-phase voltage combination winding.
Preferably, the transformer comprises an operating system, a master control system, a driving system and a mutual induction system, wherein the three-phase input voltage, the three-phase input current, the three-phase output voltage, the three-phase output current and each group of voltage combined windings are connected to the master control system through the mutual induction system, the operating system and the driving system are connected to the master control system, the operating system is a touch screen operation interface, and the master control system controls the voltage combined windings to work through the driving system.
By adopting the technical scheme, the invention has the beneficial effects that: the invention provides an automatic voltage stabilizing device of a transformer, and particularly relates to a device for controlling the automatic voltage stabilizing device of the transformer, which is shown in figure 1, when power is on or input voltage is equal to rated voltage, a main control system controls bidirectional thyristors VTA2, VTB2 and VTC2 to be switched off, simultaneously switches on the bidirectional thyristors VTA1, VTB1 and VTC1, short circuits a 3X voltage compensator coil tx1 and tx2, short circuits a 3X voltage compensator coil ty1 and ty2, short circuits a 3X voltage compensator coil tz1 and tz2 to enable output voltage to be equal to the current voltage value, when the input voltage is less than or equal to a compensation threshold value, the main control system controls the bidirectional thyristors VTA1, VTB1 and VTC1 to be switched off, simultaneously switches on the bidirectional thyristors VTA2, VTB2 and VTC2, and performs voltage compensation on a primary winding by a secondary winding to enable the output voltage to reach a preset voltage value. The invention has simple control, safety and reliability, fast voltage regulation speed of less than or equal to 10 milliseconds, wide input voltage of more than or equal to 75 percent of rated voltage value, high output voltage precision of less than or equal to 2 percent, continuous safe operation time of less than or equal to 1 ten thousand hours, input voltage sigma u of less than or equal to 15 percent, output voltage sigma u of less than or equal to 2.5 percent, rated capacity of less than or equal to 5000KVA, long service life of less than or equal to 25 years, uninterrupted automatic bypass function, real-time automatic monitoring function and the like, can make up the defects of products on the market, and has the specific expression that: the constant flux voltage regulating transformer and the variable flux voltage regulating transformer can not be synchronously adjusted along with the voltage change, and can only be adjusted after power failure, so that the transformer is troublesome to use and cannot play an effective voltage stabilizing role, and the excitation current of the transformer is increased when the voltage is increased, so that the magnetic induction intensity B in an iron core is increased, the iron loss is increased, and the temperature rise of the iron core promotes the accelerated insulation aging of a winding. And the on-load tap changer is easy to generate electric arc when adjusting voltage, and short-time undervoltage of power supply can be caused if the on-load tap changer is not frequently overhauled, so that advanced electric equipment stops working or is damaged, even voltage breakdown of a power supply system can be caused, and confusion is caused to production operation and working life of the power utilization area.
Description of the drawings:
fig. 1 is a schematic circuit diagram of an automatic voltage regulator of a transformer according to an embodiment of the present invention.
Detailed Description
The invention will be described in further detail below with reference to fig. 1 and the specific embodiments:
as shown in fig. 1, an automatic voltage stabilizing apparatus for a transformer includes a transformer and a plurality of 3X voltage compensators, and is applied to various voltage class classifications, various cooling classifications, various housing classifications, and various connection classifications and three-phase voltage synchronous regulation classifications other than a series of automatic voltage stabilizing apparatuses for power transformers described in this abstract specification. The transformer further comprises a transformer high-voltage coil R1, a transformer high-voltage coil R2, a transformer high-voltage coil S1, a transformer high-voltage coil S2, a transformer high-voltage coil T1, a transformer high-voltage coil T2, a transformer low-voltage coil R1, a transformer low-voltage coil R2, a transformer low-voltage coil R3, a transformer low-voltage coil R4, a transformer low-voltage coil S1, a transformer low-voltage coil S2, a transformer low-voltage coil S3, a transformer low-voltage coil S4, a transformer low-voltage coil T1, a transformer low-voltage coil T2, a transformer low-voltage coil T3, a transformer low-voltage coil T4, a plurality of sets of transformer tuning coils A1, a transformer tuning coil A2, a transformer tuning coil B1, a transformer tuning coil B2, a transformer tuning coil C1 and a transformer tuning coil C2. The 3X voltage compensator is a three-phase voltage compensator combined by three single-phase voltage compensators, and further comprises a 3X voltage compensator coil TX1, a 3X voltage compensator coil TX2, a 3X voltage compensator coil TY1, a 3X voltage compensator coil TY2, a 3X voltage compensator coil TZ1, a 3X voltage compensator coil TZ2, a 3X voltage compensator coil TX1, a 3X voltage compensator coil TX2, a 3X voltage compensator coil TY1, a 3X voltage compensator coil TY2, a 3X voltage compensator coil TZ1 and a 3X voltage compensator coil TZ 2. The transformer tuning coil a1 is connected to a transformer tuning coil B1 and a transformer tuning coil C1, the transformer tuning coil a2 is connected to a 3X voltage compensator coil X2, the transformer tuning coil B2 is connected to a 3X voltage compensator coil Y2, the transformer tuning coil C2 is connected to a 3X voltage compensator coil TZ2, the 3X voltage compensator coil TX1 is connected to a 3X voltage compensator coil TY1 and a 3X voltage compensator coil TZ1 are further connected to a transformer tuning coil TA1, a transformer tuning coil B1 and a transformer tuning coil C1, the 3X voltage compensator coil TX1 is connected to a 3X voltage compensator coil TY2, the 3X voltage compensator coil TY1 is connected to a 3X voltage compensator coil TZ2, and the 3X voltage compensator coil TZ1 is connected to a 3X voltage compensator coil TX 2. Further comprises a bidirectional thyristor VTA1, a bidirectional thyristor VTA2, a bidirectional thyristor VTB1, a bidirectional thyristor VTB2, a bidirectional thyristor VTC1 and a bidirectional thyristor VTC2, wherein the bidirectional thyristor VTA1 is connected between a 3X voltage compensator coil tx1 and a 3X voltage compensator coil tx2, the bidirectional thyristor VTB1 is connected between a 3X voltage compensator coil ty1 and a 3X voltage compensator coil ty2, the bidirectional thyristor VTC1 is connected between a 3X voltage compensator coil tz1 and a 3X voltage compensator coil tz2, one end of the bidirectional thyristor VTA2 is connected to the 3X voltage compensator coil tx2, one end of the bidirectional thyristor VTB2 is connected to the 3X voltage compensator coil tz2, and one end of the bidirectional thyristor VTC2 is connected to the 3X voltage compensator coil tz 2. Still include control protection switch Q1, control protection switch Q2, control protection switch Q3, the one end of control protection switch Q1 is connected in the other end of bidirectional thyristor VTA2, the one end of control protection switch Q2 is connected in the other end of bidirectional thyristor VTB2, the one end of control protection switch Q3 is connected in the other end of bidirectional thyristor VTC 2. The single-phase protection circuit further comprises a single-phase self-coupling step-down transformer A, a single-phase self-coupling step-down transformer B and a single-phase self-coupling step-down transformer C, wherein the single-phase self-coupling step-down transformer A is connected to the other end of the control protection switch Q1, the single-phase self-coupling step-down transformer B is connected to the other end of the control protection switch Q2, the single-phase self-coupling step-down transformer C is connected to the other end of the control protection switch Q3, the other end of the single-phase self-coupling step-down transformer A is connected to the phase voltage combination winding A, the other end of the single-phase self-coupling step-down transformer B is connected to the phase voltage combination winding C, and the other end of the single-phase self-coupling step-down transformer C is connected to the phase voltage combination winding C. Still include operating system, master control system, actuating system and mutual induction system, three-phase input voltage, electric current and three-phase output voltage, electric current and each group voltage combination winding all connect in master control system through mutual induction system, operating system and actuating system all connect in master control system, operating system is touch screen operation interface, master control system passes through actuating system control voltage combination winding work.
The working principle is as follows: when the power is on or the input voltage is equal to the rated voltage, the main control system controls the bidirectional thyristors VTA2, VTB2 and VTC2 to be turned off, simultaneously turns on the bidirectional thyristors VTA1, VTB1 and VTC1, short-circuits the 3X voltage compensator coils tx1 and tx2, short-circuits the 3X voltage compensator coils ty1 and ty2 and short-circuits the 3X voltage compensator coils tz1 and tz2 to enable the output voltage to be equal to the current voltage value, and when the input voltage is less than or equal to the compensation threshold value, the main control system controls the bidirectional thyristors VTA1, VTB1 and VTC1 to be turned off, simultaneously turns on the bidirectional thyristors VTA2, VTB2 and VTC2, and enables the secondary winding to perform voltage compensation on the primary winding to enable the output voltage to reach the preset voltage value.
The present invention has been described in detail with reference to the specific embodiments, but these should not be construed as limitations of the present invention. Numerous variations and modifications can be made by those skilled in the art without departing from the principles of the invention, which should also be viewed as the protection of the invention.
Claims (6)
1. IVi is a transformer automatic voltage regulator device, its characterized in that: the automatic voltage stabilizer comprises a transformer and a plurality of groups of 3X voltage compensators, and is applied to various voltage grade classifications, various cooling classifications, various shell classifications, and various connection classifications and three-phase voltage synchronous regulation classifications except a series of automatic voltage stabilizers of power transformers described in the abstract specification. The transformer further comprises a transformer high-voltage coil R1, a transformer high-voltage coil R2, a transformer high-voltage coil S1, a transformer high-voltage coil S2, a transformer high-voltage coil T1, a transformer high-voltage coil T2, a transformer low-voltage coil R1, a transformer low-voltage coil R2, a transformer low-voltage coil R3, a transformer low-voltage coil R4, a transformer low-voltage coil S1, a transformer low-voltage coil S2, a transformer low-voltage coil S3, a transformer low-voltage coil S4, a transformer low-voltage coil T1, a transformer low-voltage coil T2, a transformer low-voltage coil T3, a transformer low-voltage coil T4, a plurality of sets of transformer tuning coils A1, a transformer tuning coil A2, a transformer tuning coil B1, a transformer tuning coil B2, a transformer tuning coil C1 and a transformer tuning coil C2. The 3X voltage compensator is a three-phase voltage compensator combined by three single-phase voltage compensators, and further comprises a 3X voltage compensator coil TX1, a 3X voltage compensator coil TX2, a 3X voltage compensator coil TY1, a 3X voltage compensator coil TY2, a 3X voltage compensator coil TZ1, a 3X voltage compensator coil TZ2, a 3X voltage compensator coil TX1, a 3X voltage compensator coil TX2, a 3X voltage compensator coil TY1, a 3X voltage compensator coil TY2, a 3X voltage compensator coil TZ1 and a 3X voltage compensator coil TZ 2.
2. The automatic voltage stabilizer of transformer according to claim 1, characterized in that: further included is that the transformer tuning coil a1 is connected to a transformer tuning coil B1 and a transformer tuning coil C1, the transformer tuning coil a2 is connected to A3X voltage compensator coil X2, the transformer tuning coil B2 is connected to A3X voltage compensator coil Y2, the transformer tuning coil C2 is connected to A3X voltage compensator coil TZ2, the 3X voltage compensator coil TX1 is connected to A3X voltage compensator coil TY1 and A3X voltage compensator coil TZ1 are further connected to a transformer tuning coil TA1, a transformer tuning coil B1 and a transformer tuning coil C1, the 3X voltage compensator coil TX1 is connected to A3X voltage compensator coil TY2, the 3X voltage compensator coil TY1 is connected to A3X voltage compensator coil TZ2, and the 3X voltage compensator coil TZ1 is connected to A3X voltage compensator coil TX 2.
3. The automatic voltage stabilizer of transformer according to claim 2, characterized in that: further comprises a bidirectional thyristor VTA1, a bidirectional thyristor VTA2, a bidirectional thyristor VTB1, a bidirectional thyristor VTB2, a bidirectional thyristor VTC1 and a bidirectional thyristor VTC2, wherein the bidirectional thyristor VTA1 is connected between a 3X voltage compensator coil tx1 and a 3X voltage compensator coil tx2, the bidirectional thyristor VTB1 is connected between a 3X voltage compensator coil ty1 and a 3X voltage compensator coil ty2, the bidirectional thyristor VTC1 is connected between a 3X voltage compensator coil tz1 and a 3X voltage compensator coil tz2, one end of the bidirectional thyristor VTA2 is connected to the 3X voltage compensator coil tx2, one end of the bidirectional thyristor VTB2 is connected to the 3X voltage compensator coil tz2, and one end of the bidirectional thyristor VTC2 is connected to the 3X voltage compensator coil tz 2.
4. The automatic voltage stabilizer of transformer according to claim 3, characterized in that: still include control protection switch Q1, control protection switch Q2, control protection switch Q3, the one end of control protection switch Q1 is connected in the other end of bidirectional thyristor VTA2, the one end of control protection switch Q2 is connected in the other end of bidirectional thyristor VTB2, the one end of control protection switch Q3 is connected in the other end of bidirectional thyristor VTC 2.
5. The automatic voltage stabilizer of transformer according to claim 4, wherein: the single-phase protection circuit further comprises a single-phase self-coupling step-down transformer A, a single-phase self-coupling step-down transformer B and a single-phase self-coupling step-down transformer C, wherein the single-phase self-coupling step-down transformer A is connected to the other end of the control protection switch Q1, the single-phase self-coupling step-down transformer B is connected to the other end of the control protection switch Q2, the single-phase self-coupling step-down transformer C is connected to the other end of the control protection switch Q3, the other end of the single-phase self-coupling step-down transformer A is connected to the phase voltage combination winding A, the other end of the single-phase self-coupling step-down transformer B is connected to the phase voltage combination winding C, and the other end of the single-phase self-coupling step-down transformer C is connected to the phase voltage combination winding C.
6. The automatic voltage stabilizer of transformer according to claim 6, wherein: still include operating system, master control system, actuating system and mutual induction system, three-phase input voltage, electric current and three-phase output voltage, electric current and each group voltage combination winding all connect in master control system through mutual induction system, operating system and actuating system all connect in master control system, operating system is touch screen operation interface, master control system passes through actuating system control voltage combination winding work.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110940862.2A CN113644660A (en) | 2021-08-17 | 2021-08-17 | Automatic voltage stabilizer for transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110940862.2A CN113644660A (en) | 2021-08-17 | 2021-08-17 | Automatic voltage stabilizer for transformer |
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| CN113644660A true CN113644660A (en) | 2021-11-12 |
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| CN202110940862.2A Withdrawn CN113644660A (en) | 2021-08-17 | 2021-08-17 | Automatic voltage stabilizer for transformer |
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- 2021-08-17 CN CN202110940862.2A patent/CN113644660A/en not_active Withdrawn
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Application publication date: 20211112 |