阅读说明：本技术 配电变压器调压装置 (Voltage regulator for distribution transformer ) 是由 张谋龙 于 2021-08-17 设计创作，主要内容包括：本发明涉及电力技术领域,具体是涉及一种电力变压器自动稳压装置,更具体的是配电变压器调压装置,其通过在电力变压器上设有复数组调谐绕组与外接复数组电压调整装置一一对应连接组成的电压组合绕组以及保护装置,操作系统,主控系统,驱动系统,组成的一系列电力变压器自动稳压装置。本发明具有控制简单、安全可靠、调压速度快、输入电压宽、稳压精度高、连续安全运行时间长的有益效果。(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 a voltage regulating device of a distribution transformer. The invention has the advantages of simple control, safety, reliability, high voltage regulation speed, wide input voltage, high voltage stabilization precision and long continuous safe operation time.)

1. Automatic voltage regulator device of II types of combination formula power transformer step-down, its characterized in that: the automatic voltage stabilizing device comprises an IIi distribution transformer voltage regulating device, an IIii distribution transformer automatic voltage stabilizing device, an IIiii encapsulated coil transformer voltage regulating device, an IIiv double-winding transformer voltage regulating device, an IIv transformer voltage regulating device and an IIvi transformer voltage regulating device, wherein the II class is represented by the IIi class, and further comprises a step-up transformer and a plurality of groups of 3Z step-down devices, and is applied to various voltage class 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 boosting transformer further comprises a boosting transformer high-voltage coil U1, a boosting transformer high-voltage coil U2, a boosting transformer high-voltage coil V1, a boosting transformer high-voltage coil V2, a boosting transformer high-voltage coil W1, a boosting transformer high-voltage coil W2, a boosting transformer low-voltage coil U1, a boosting transformer low-voltage coil U2, a boosting transformer low-voltage coil V1, a boosting transformer low-voltage coil V2, a boosting transformer low-voltage coil W1, a boosting transformer low-voltage coil W2, a plurality of groups of boosting transformer tuning coils R1, a boosting transformer tuning coil R2, a boosting transformer tuning coil S1, a boosting transformer tuning coil S2, a boosting transformer tuning coil T1 and a boosting transformer tuning coil T2. The 3Z step-down transformer is a three-phase step-down transformer combined by three single-phase step-down transformers, and further comprises a 3Z step-down transformer coil X1, a 3Z step-down transformer coil X2, a 3Z step-down transformer coil Y1, a 3Z step-down transformer coil Y2, a 3Z step-down transformer coil Z1, a 3Z step-down transformer coil Z2, a 3Z step-down transformer coil X1, a 3Z step-down transformer coil X2, a 3Z step-down transformer coil Y1, a 3Z step-down transformer coil Y2, a 3Z step-down transformer coil Z1 and a 3Z step-down transformer coil Z2.

2. The voltage regulator of a distribution transformer according to claim 1, wherein: further comprising said step-up transformer tuning coil R1 connected to step-up transformer tuning coil T2, said step-up transformer tuning coil R2 connected to step-up transformer tuning coil S1, said step-up transformer tuning coil S2 connected to step-up transformer tuning coil T1, said step-up transformer tuning coil T2 further connected to 3Z step-down coil X1, said step-up transformer tuning coil S2 further connected to 3Z step-down coil Y1, said step-up transformer tuning coil R2 further connected to 3Z step-down coil Z1, said 3Z step-down coil X1 further connected to 3Z step-down coil Z2, said 3Z step-down coil Y1 further connected to 3Z step-down coil X2, said 3Z step-down coil Z1 further connected to 3Z step-down coil Y2, said 3Z step-down coil X1 connected to 3Z step-down coil Y2, said 3Z step-down coil Y1 connected to 3Z step-down coil Z2, the 3Z buck coil Z1 is connected to the 3Z buck coil x 2.

3. The voltage regulator of a distribution transformer according to claim 2, wherein: the bidirectional thyristor WCCA1, the bidirectional thyristor WCCA2, the bidirectional thyristor WCCB1, the bidirectional thyristor WCCB2, the bidirectional thyristor WCCC1, the bidirectional thyristor WCCC2, the control protection switch Q1, the control protection switch Q2 and the control protection switch Q3 are further included, the bidirectional thyristor WCCA2 is connected between a 3Z step-down device coil x1 and a 3Z step-down device coil x2, the bidirectional thyristor WCCB2 is connected between a 3Z step-down device coil y1 and a 3Z step-down device coil y2, the bidirectional thyristor WCCC2 is connected between a 3Z step-down device coil w2 and a 3Z step-down device coil w2, the bidirectional thyristor WCCA2 is connected to the 3Z step-down device coil x2, the bidirectional thyristor WCCB2 is connected to the 3Z step-down device coil y2, the bidirectional thyristor CC2 is connected to the 3Z step-down device coil Z2, the other end of the bidirectional thyristor WCCA2 is connected to one end of the control protection switch Q2, the other end of the bidirectional thyristor WCCC1 is connected with one end of a control protection switch Q3, the other end of the control protection switch Q1 is connected with a low-voltage coil u1 of the boosting transformer, the other end of the control protection switch Q2 is connected with a low-voltage coil v1 of the boosting transformer, and the other end of the control protection switch Q3 is connected with a low-voltage coil w1 of the boosting transformer.

4. The voltage regulator of a distribution transformer according to claim 1, 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.

Technical Field

The invention relates to the field of power technology, in particular to a voltage regulating device of a distribution 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.

Electric power is one of the most important energy sources used in modern industry, agriculture and modern society life, and various industrial electric equipment is widely influenced by voltage change. With the development of science and technology, electricity will play a greater role in the development of the human society.

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 at 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 II of the invention is a distribution transformer voltage regulating device, which also comprises a step-up transformer and a plurality of groups of 3Z step-down transformers, 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 boosting transformer further comprises a boosting transformer high-voltage coil U1, a boosting transformer high-voltage coil U2, a boosting transformer high-voltage coil V1, a boosting transformer high-voltage coil V2, a boosting transformer high-voltage coil W1, a boosting transformer high-voltage coil W2, a boosting transformer low-voltage coil U1, a boosting transformer low-voltage coil U2, a boosting transformer low-voltage coil V1, a boosting transformer low-voltage coil V2, a boosting transformer low-voltage coil W1, a boosting transformer low-voltage coil W2, a plurality of groups of boosting transformer tuning coils R1, a boosting transformer tuning coil R2, a boosting transformer tuning coil S1, a boosting transformer tuning coil S2, a boosting transformer tuning coil T1 and a boosting transformer tuning coil T2. The 3Z step-down transformer is a three-phase step-down transformer combined by three single-phase step-down transformers, and further comprises a 3Z step-down transformer coil X1, a 3Z step-down transformer coil X2, a 3Z step-down transformer coil Y1, a 3Z step-down transformer coil Y2, a 3Z step-down transformer coil Z1, a 3Z step-down transformer coil Z2, a 3Z step-down transformer coil X1, a 3Z step-down transformer coil X2, a 3Z step-down transformer coil Y1, a 3Z step-down transformer coil Y2, a 3Z step-down transformer coil Z1 and a 3Z step-down transformer coil Z2.

In a further improvement, the step-up transformer tuning coil R1 is connected to a step-up transformer tuning coil T2, the step-up transformer tuning coil R2 is connected to a step-up transformer tuning coil S1, the step-up transformer tuning coil S2 is connected to a step-up transformer tuning coil T1, the step-up transformer tuning coil T2 is further connected to a 3Z step-down coil X1, the step-up transformer tuning coil S2 is further connected to a 3Z step-down coil Y1, the step-up transformer tuning coil R2 is further connected to a 3Z step-down coil Z1, the 3Z step-down coil X1 is further connected to a 3Z step-down coil Z2, the 3Z step-down coil Y1 is further connected to a 3Z step-down coil X2, the 3Z step-down coil Z1 is further connected to a 3Z step-down coil Y2, the 3Z step-down coil X1 is connected to a 3Z step-down coil Y2, the 3Z step-down coil Y1 is connected to a step-down coil Z2, the 3Z buck coil Z1 is connected to the 3Z buck coil x 2.

In a further improvement, the system further comprises a triac WCCA1, a triac WCCA2, a triac WCCB1, a triac WCCB2, a triac WCCC1, a triac WCCC2, a control protection switch Q1, a control protection switch Q2 and a control protection switch Q3, wherein the triac WCCA2 is connected between a 3Z step-down coil x1 and a 3Z step-down coil x2, the triac WCCB2 is connected between a 3Z step-down coil y1 and a 3Z step-down coil y2, the triac WCCC2 is connected between a 3Z step-down coil w1 and a 3Z step-down coil w2, the triac WCCA1 is connected to a 3Z step-down coil x1, the triac WCCB1 is connected to a 3Z step-down coil y1, the triac WCCC1 is connected to a 3Z WCCA coil Z1, the other end of the triac WCCA1 is connected to one end of the control protection switch Q72, the other end of the bidirectional thyristor WCCB1 is connected with one end of a control protection switch Q2, the other end of the bidirectional thyristor WCCC1 is connected with one end of a control protection switch Q3, the other end of the control protection switch Q1 is connected with a low-voltage coil u1 of the boosting transformer, the other end of the control protection switch Q2 is connected with a low-voltage coil v1 of the boosting transformer, and the other end of the control protection switch Q3 is connected with a low-voltage coil w1 of the boosting 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 distribution transformer voltage regulating device, and particularly relates to a distribution transformer voltage regulating device shown in figure 1, when power is on or input voltage is equal to rated voltage, a main control system controls a bidirectional thyristor WCCA1, a WCCB1 and a WTCC1 to be turned off, and simultaneously turns on the bidirectional thyristors WCCA2, the WCCB2 and the WCCC2, short circuits a 3Z step-down device coil x1 and an x2, a 3Z step-down device coil y1 and a y2, and a 3Z step-down device coil Z1 and a Z2 to enable output voltage to be equal to the current voltage value, when the input voltage is higher than the rated voltage, the main control system controls the bidirectional thyristors WCCA2, the WCCB2 and the WCCC2 to be turned off, and simultaneously turns on the bidirectional thyristors WCCA1, the WCCB1 and the WTCC1 to offset voltage of a primary winding to a secondary winding, and enable the output voltage to be equal to the rated voltage value. The invention has simple control, safety and reliability, fast voltage stabilizing speed of less than or equal to 20 milliseconds, wide input voltage of more than or equal to 125 percent of rated voltage value, high output voltage precision of less than or equal to 2.5 percent, continuous safe operation time of less than or equal to 1 ten thousand hours, unbalanced input three phases of less than or equal to 15 percent, unbalanced output three phases of less than or equal to 3 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 concrete 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 a voltage regulator of a distribution 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, the voltage regulator of the distribution transformer further comprises a step-up transformer and a plurality of groups of 3Z step-down transformers, and is applied to various voltage class classifications, various cooling classifications, various shell classifications, and various connection classifications and three-phase voltage synchronous regulation classifications except for a series of automatic voltage stabilizing devices of the power transformer described in this abstract specification. The boosting transformer further comprises a boosting transformer high-voltage coil U1, a boosting transformer high-voltage coil U2, a boosting transformer high-voltage coil V1, a boosting transformer high-voltage coil V2, a boosting transformer high-voltage coil W1, a boosting transformer high-voltage coil W2, a boosting transformer low-voltage coil U1, a boosting transformer low-voltage coil U2, a boosting transformer low-voltage coil V1, a boosting transformer low-voltage coil V2, a boosting transformer low-voltage coil W1, a boosting transformer low-voltage coil W2, a plurality of groups of boosting transformer tuning coils R1, a boosting transformer tuning coil R2, a boosting transformer tuning coil S1, a boosting transformer tuning coil S2, a boosting transformer tuning coil T1 and a boosting transformer tuning coil T2. The 3Z step-down transformer is a three-phase step-down transformer combined by three single-phase step-down transformers, and further comprises a 3Z step-down transformer coil X1, a 3Z step-down transformer coil X2, a 3Z step-down transformer coil Y1, a 3Z step-down transformer coil Y2, a 3Z step-down transformer coil Z1, a 3Z step-down transformer coil Z2, a 3Z step-down transformer coil X1, a 3Z step-down transformer coil X2, a 3Z step-down transformer coil Y1, a 3Z step-down transformer coil Y2, a 3Z step-down transformer coil Z1 and a 3Z step-down transformer coil Z2. Further comprising said step-up transformer tuning coil R1 connected to step-up transformer tuning coil T2, said step-up transformer tuning coil R2 connected to step-up transformer tuning coil S1, said step-up transformer tuning coil S2 connected to step-up transformer tuning coil T1, said step-up transformer tuning coil T2 further connected to 3Z step-down coil X1, said step-up transformer tuning coil S2 further connected to 3Z step-down coil Y1, said step-up transformer tuning coil R2 further connected to 3Z step-down coil Z1, said 3Z step-down coil X1 further connected to 3Z step-down coil Z2, said 3Z step-down coil Y1 further connected to 3Z step-down coil X2, said 3Z step-down coil Z1 further connected to 3Z step-down coil Y2, said 3Z step-down coil X1 connected to 3Z step-down coil Y2, said 3Z step-down coil Y1 connected to 3Z step-down coil Z2, the 3Z buck coil Z1 is connected to the 3Z buck coil x 2. The bidirectional thyristor WCCA1, the bidirectional thyristor WCCA2, the bidirectional thyristor WCCB1, the bidirectional thyristor WCCB2, the bidirectional thyristor WCCC1, the bidirectional thyristor WCCC2, the control protection switch Q1, the control protection switch Q2 and the control protection switch Q3 are further included, the bidirectional thyristor WCCA2 is connected between a 3Z step-down device coil x1 and a 3Z step-down device coil x2, the bidirectional thyristor WCCB2 is connected between a 3Z step-down device coil y1 and a 3Z step-down device coil y2, the bidirectional thyristor WCCC2 is connected between a 3Z step-down device coil w2 and a 3Z step-down device coil w2, the bidirectional thyristor WCCA2 is connected to the 3Z step-down device coil x2, the bidirectional thyristor WCCB2 is connected to the 3Z step-down device coil y2, the bidirectional thyristor CC2 is connected to the 3Z step-down device coil Z2, the other end of the bidirectional thyristor WCCA2 is connected to one end of the control protection switch Q2, the other end of the bidirectional thyristor WCCC1 is connected with one end of a control protection switch Q3, the other end of the control protection switch Q1 is connected with a low-voltage coil u1 of the boosting transformer, the other end of the control protection switch Q2 is connected with a low-voltage coil v1 of the boosting transformer, and the other end of the control protection switch Q3 is connected with a low-voltage coil w1 of the boosting 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-on or input voltage is equal to the rated voltage, the master control system controls the bidirectional thyristors WCCA1, WCCB1 and WTCC1 to be turned off, and simultaneously turns on the bidirectional thyristors WCCA2, WCCB2 and WCCC2, short-circuits the 3Z voltage reducer coils x1 and x2, short-circuits the 3Z voltage reducer coils y1 and y2, and short-circuits the 3Z voltage reducer coils Z1 and Z2 to enable the output voltage to be equal to the current voltage value, and when the input voltage is higher than the rated voltage, the master control system controls the bidirectional thyristors WCCA2, WCCB2 and WCCC2 to be turned off, and simultaneously turns on the bidirectional thyristors WCCA1, WCCB1 and WTCC1 to enable the primary winding to perform voltage cancellation on the secondary winding to enable the output voltage to be equal to the rated 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.