CN113809752A - Voltage regulator for split transformer - Google Patents
Voltage regulator for split transformer Download PDFInfo
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- CN113809752A CN113809752A CN202110989198.0A CN202110989198A CN113809752A CN 113809752 A CN113809752 A CN 113809752A CN 202110989198 A CN202110989198 A CN 202110989198A CN 113809752 A CN113809752 A CN 113809752A
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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 a series of automatic voltage stabilizing devices of a power transformer, which have the advantages of simple control, safety, reliability, high voltage regulating speed, wide input voltage, high voltage stabilizing precision and long continuous, safe and operating time, and more particularly relates to a voltage regulating device of a split transformer. The invention has simple control, safety and reliability, the voltage regulating speed is less than 20 milliseconds, the input voltage is more than or equal to 120 percent of rated voltage value, the output voltage precision is less than or equal to 2.5 percent, the continuous safe operation time is less than or equal to 1 ten thousand hours, the rated capacity is more than or equal to 5000KVA, the service life is less than or equal to 25 years, and the invention has uninterrupted automatic bypass function, real-time automatic monitoring function and the like.
Description
Technical Field
The invention relates to the field of power technology, in particular to a voltage regulating device of a split 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: the operation voltage value is within the range of 90-80% of the rated voltage value, and the voltage change lasts for more than 1 minute;
③ overvoltage: the operation voltage value is within the range of 110-120% of the rated voltage value, and the voltage change 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 unbalance of the R is that the unevenness of the running 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 I iii technical scheme of the invention is a split transformer voltage regulating device which comprises a split transformer and a plurality of groups of three-phase step-down transformers and is applied to various voltage grade classifications, various cooling classifications, various shell classifications and various connection classifications and combination classifications except a series of automatic voltage stabilizing devices of power transformers described in the abstract of the specification. The split transformer further comprises a split transformer high-voltage winding A1, a split transformer high-voltage winding A2, a split transformer high-voltage winding B1, a split transformer high-voltage winding B2, a split transformer high-voltage winding C1, a split transformer high-voltage winding C2, a split transformer low-voltage winding a, a split transformer low-voltage winding B, a split transformer low-voltage winding C, a split transformer low-voltage winding Y, a plurality of split transformer tuning windings X1, a split transformer tuning winding X2, a split transformer tuning winding Y1, a split transformer tuning winding Y2, a split transformer tuning winding Z1, a split transformer tuning winding Z2, and the three-phase step-down transformer further comprises a three-phase step-down transformer winding U1, a three-phase step-down transformer winding U2, a three-phase step-down transformer winding V1, a three-phase step-down winding V2, a three-phase step-down winding W1, a three-phase step-down winding W2, a three-phase step-down transformer winding U1, Three-phase step-down transformer winding u2, three-phase step-down transformer winding v1, three-phase step-down transformer winding v2, three-phase step-down transformer winding w1 and three-phase step-down transformer winding w 2.
In a further improvement, the split transformer tuning winding X1 is connected to a split transformer tuning winding Y2, the split transformer tuning winding X2 is connected to a split transformer tuning winding Z1, the split transformer tuning winding Z2 is connected to a split transformer tuning winding Y1, the split transformer tuning winding X1 is also connected to a three-phase buck winding U1, the split transformer tuning winding Y1 is also connected to a three-phase buck winding V1, the split transformer tuning winding Z1 is also connected to a three-phase buck winding W1, the three-phase buck winding W2 is connected to a three-phase buck winding V1, the three-phase buck winding V2 is connected to the three-phase buck winding U1, the three-phase buck winding U2 is connected to the three-phase buck winding W1, the three-phase buck winding u1 is connected to the three-phase buck winding v1 and the three-phase buck winding w 1.
In a further improvement, the three-phase voltage reducer further comprises a bidirectional thyristor GTOA1, a bidirectional thyristor GTOA2, a bidirectional thyristor GTOB1, a bidirectional thyristor GTOB2, a bidirectional thyristor GTOC1 and a bidirectional thyristor GTOC2, wherein the bidirectional thyristor GTOA1 is connected between a three-phase voltage reducer winding u1 and a three-phase voltage reducer winding u2, the bidirectional thyristor GTOB1 is connected between a three-phase voltage reducer winding v1 and a three-phase voltage reducer winding v2, the bidirectional thyristor GTOC1 is connected between a three-phase voltage reducer winding w1 and a three-phase voltage reducer winding w2, one end of the bidirectional thyristor GTOA2 is connected to the three-phase voltage reducer winding u2, one end of the bidirectional thyristor GTOB2 is connected to the three-phase voltage reducer winding v2, and one end of the bidirectional thyristor GTOC2 is connected to the three-phase voltage reducer winding w 2.
In a further improvement, the three-phase control protection circuit further comprises a three-phase control protection switch QF, and one end of the three-phase control protection switch QF is correspondingly connected to the other ends of the bidirectional thyristor GTOA2, the bidirectional thyristor GTOB2 and the bidirectional thyristor GTOC 2. And the other end of the three-phase control protection switch QF is respectively and correspondingly connected to the low-voltage winding a of the split transformer, the low-voltage winding b of the split transformer and the low-voltage winding c of the split transformer.
The improved touch screen comprises an operating system, a main control system and a driving system, wherein the three-phase input voltage, the three-phase current, the three-phase output voltage, the three-phase current and each group of voltage combined windings are connected to the main control system, the operating system and the driving system are connected to the main control system, the operating system is a touch screen operation interface, and the main 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 a voltage regulating device of a split transformer, which is particularly shown in figure 1, when power is on or input voltage is equal to rated voltage, a main control system controls a secondary winding of a three-phase voltage reducer to be in short circuit, so that output voltage is equal to the current voltage value. When the input voltage is higher than the rated voltage value, the main control system controls the bidirectional thyristors GTOA1, GTOB1 and GTOC1 to be turned off, and simultaneously, the voltage of the secondary winding is counteracted for 1 secondary winding, so that the output voltage is equal to the preset voltage value.
The invention has simple control, safety and reliability, the voltage regulating speed is less than 20 milliseconds, the input voltage is more than or equal to 120 percent of rated voltage value, the output voltage precision is less than or equal to 2.5 percent, the continuous safe operation time is less than or equal to 1 ten thousand hours, the rated capacity is more than or equal to 5000KVA, the service life is less than or equal to 25 years, and the invention has uninterrupted automatic bypass function, real-time automatic monitoring function and the like, and can make up the defects of products on the market. The concrete expression is as follows: 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 a voltage regulating device of a split 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, a split transformer voltage regulator includes a split transformer and a plurality of groups of three-phase step-down transformers, and is applied to various voltage class classifications, various cooling classifications, various housing classifications, and various connection classifications and combination classifications except for a series of automatic voltage stabilizing apparatuses for power transformers described in the abstract of this specification. The split transformer further comprises a split transformer high-voltage winding A1, a split transformer high-voltage winding A2, a split transformer high-voltage winding B1, a split transformer high-voltage winding B2, a split transformer high-voltage winding C1, a split transformer high-voltage winding C2, a split transformer low-voltage winding a, a split transformer low-voltage winding B, a split transformer low-voltage winding C, a split transformer low-voltage winding Y, a plurality of split transformer tuning windings X1, a split transformer tuning winding X2, a split transformer tuning winding Y1, a split transformer tuning winding Y2, a split transformer tuning winding Z1, a split transformer tuning winding Z2, and the three-phase step-down transformer further comprises a three-phase step-down transformer winding U1, a three-phase step-down transformer winding U2, a three-phase step-down transformer winding V1, a three-phase step-down winding V2, a three-phase step-down winding W1, a three-phase step-down winding W2, a three-phase step-down transformer winding U1, Three-phase step-down transformer winding u2, three-phase step-down transformer winding v1, three-phase step-down transformer winding v2, three-phase step-down transformer winding w1 and three-phase step-down transformer winding w 2. The split-type transformer tuning winding X1 is connected to a split-type transformer tuning winding Y2, the split-type transformer tuning winding X2 is connected to a split-type transformer tuning winding Z1, the split-type transformer tuning winding Z2 is connected to a split-type transformer tuning winding Y1, the split-type transformer tuning winding X1 is further connected to a three-phase step-down device winding U1, the split-type transformer tuning winding Y1 is further connected to a three-phase step-down device winding V1, the split-type transformer tuning winding Z1 is further connected to a three-phase step-down device winding W1, the three-phase step-down device winding W2 is connected to a three-phase step-down device winding V1, the three-phase step-down device winding V2 is connected to a three-phase step-down device winding U1, the three-phase step-down device winding U2 is connected to a three-phase step-down device winding W1, and the three-phase step-down device winding U1 is connected to a three-phase step-down device winding V1 and a three-phase step-down device winding W1. The three-phase voltage reducer further comprises a bidirectional thyristor GTOA1, a bidirectional thyristor GTOA2, a bidirectional thyristor GTOB1, a bidirectional thyristor GTOB2, a bidirectional thyristor GTOC1 and a bidirectional thyristor GTOC2, wherein the bidirectional thyristor GTOA1 is connected between a three-phase voltage reducer winding u1 and a three-phase voltage reducer winding u2, the bidirectional thyristor GTOB1 is connected between a three-phase voltage reducer winding v1 and a three-phase voltage reducer winding v2, the bidirectional thyristor GTOC1 is connected between a three-phase voltage reducer winding w1 and a three-phase voltage reducer winding w2, one end of the bidirectional thyristor GTOA2 is connected to the three-phase voltage reducer winding u2, one end of the bidirectional thyristor GTOB2 is connected to the three-phase voltage reducer winding v2, and one end of the bidirectional thyristor GTOC2 is connected to the three-phase voltage reducer winding w 2. The three-phase control protection circuit also comprises a three-phase control protection switch QF, wherein one end of the three-phase control protection switch QF is correspondingly connected to the other ends of the bidirectional thyristor GTOA2, the bidirectional thyristor GTOB2 and the bidirectional thyristor GTOC 2. And the other end of the three-phase control protection switch QF is respectively and correspondingly connected to the low-voltage winding a of the split transformer, the low-voltage winding b of the split transformer and the low-voltage winding c of the split transformer. The three-phase input voltage, the current, the three-phase output voltage, the current and each group of voltage combined windings are connected to the main control system, the operating system and the driving system are connected to the main control system, the operating system is a touch screen operation interface, and the main control system controls the voltage combined windings to work through the driving system.
The working principle is as follows: . When the power is switched on or the input voltage is equal to the rated voltage, the main control system controls the secondary winding of the three-phase voltage reducer to be in short circuit, so that the output voltage is equal to the current voltage value. When the input voltage is higher than the rated voltage value, the main control system controls the bidirectional thyristors GTOA1, GTOB1 and GTOC1 to be turned off, and simultaneously, the voltage of the secondary winding is counteracted for 1 secondary winding, so that the output voltage is equal to 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 (5)
1. A split transformer voltage regulator is characterized in that: the device comprises a split transformer and a plurality of groups of three-phase step-down transformers, and is applied to various voltage grade classifications, various cooling classifications, various shell classifications and various connection classifications and combination classifications except a series of automatic voltage stabilizing devices of the power transformer described in the abstract of the specification; the split transformer further comprises a split transformer high-voltage winding A1, a split transformer high-voltage winding A2, a split transformer high-voltage winding B1, a split transformer high-voltage winding B2, a split transformer high-voltage winding C1, a split transformer high-voltage winding C2, a split transformer low-voltage winding a, a split transformer low-voltage winding B, a split transformer low-voltage winding C, a split transformer low-voltage winding Y, a plurality of split transformer tuning windings X1, a split transformer tuning winding X2, a split transformer tuning winding Y1, a split transformer tuning winding Y2, a split transformer tuning winding Z1, and a split transformer tuning winding Z2, and the three-phase step-down transformer further comprises a three-phase step-down transformer winding U1, a three-phase step-down transformer winding U2, a three-phase step-down transformer winding V1, a three-phase step-down winding V2, a three-phase step-down winding W1, a three-phase step-down winding W2, a three-phase step-down transformer winding U1, Three-phase step-down transformer winding u2, three-phase step-down transformer winding v1, three-phase step-down transformer winding v2, three-phase step-down transformer winding w1 and three-phase step-down transformer winding w 2.
2. A split transformer voltage regulation device according to claim 1, wherein: the split-type transformer tuning winding X1 is connected to a split-type transformer tuning winding Y2, the split-type transformer tuning winding X2 is connected to a split-type transformer tuning winding Z1, the split-type transformer tuning winding Z2 is connected to a split-type transformer tuning winding Y1, the split-type transformer tuning winding X1 is further connected to a three-phase step-down device winding U1, the split-type transformer tuning winding Y1 is further connected to a three-phase step-down device winding V1, the split-type transformer tuning winding Z1 is further connected to a three-phase step-down device winding W1, the three-phase step-down device winding W2 is connected to a three-phase step-down device winding V1, the three-phase step-down device winding V2 is connected to a three-phase step-down device winding U1, the three-phase step-down device winding U2 is connected to a three-phase step-down device winding W1, and the three-phase step-down device winding U1 is connected to a three-phase step-down device winding V1 and a three-phase step-down device winding W1.
3. A split transformer voltage regulation device according to claim 2, wherein: the three-phase voltage reducer further comprises a bidirectional thyristor GTOA1, a bidirectional thyristor GTOA2, a bidirectional thyristor GTOB1, a bidirectional thyristor GTOB2, a bidirectional thyristor GTOC1 and a bidirectional thyristor GTOC2, wherein the bidirectional thyristor GTOA1 is connected between a three-phase voltage reducer winding u1 and a three-phase voltage reducer winding u2, the bidirectional thyristor GTOB1 is connected between a three-phase voltage reducer winding v1 and a three-phase voltage reducer winding v2, the bidirectional thyristor GTOC1 is connected between a three-phase voltage reducer winding w1 and a three-phase voltage reducer winding w2, one end of the bidirectional thyristor GTOA2 is connected to the three-phase voltage reducer winding u2, one end of the bidirectional thyristor GTOB2 is connected to the three-phase voltage reducer winding v2, and one end of the bidirectional thyristor GTOC2 is connected to the three-phase voltage reducer winding w 2.
4. A split transformer voltage regulation device according to claim 3, wherein: the transformer split-winding transformer further comprises a three-phase control protection switch QF, one end of the three-phase control protection switch QF is correspondingly connected to the other ends of the bidirectional thyristor GTOA2, the bidirectional thyristor GTOB2 and the bidirectional thyristor GTOC2, and the other end of the three-phase control protection switch QF is correspondingly connected to the low-voltage winding a of the split-winding transformer, the low-voltage winding b of the split-winding transformer and the low-voltage winding c of the split-winding transformer respectively.
5. A split transformer voltage regulation device according to claim 4, wherein: the three-phase input voltage, the current, the three-phase output voltage, the current and each group of voltage combined windings are connected to the main control system, the operating system and the driving system are connected to the main control system, the operating system is a touch screen operation interface, and the main control system controls the voltage combined windings to work through the driving system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110989198.0A CN113809752A (en) | 2021-08-26 | 2021-08-26 | Voltage regulator for split transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110989198.0A CN113809752A (en) | 2021-08-26 | 2021-08-26 | Voltage regulator for split transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113809752A true CN113809752A (en) | 2021-12-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110989198.0A Withdrawn CN113809752A (en) | 2021-08-26 | 2021-08-26 | Voltage regulator for split transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113809752A (en) |
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2021
- 2021-08-26 CN CN202110989198.0A patent/CN113809752A/en not_active Withdrawn
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Application publication date: 20211217 |
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