CN216564521U

CN216564521U - Three-phase low-voltage compensation device

Info

Publication number: CN216564521U
Application number: CN202121651970.XU
Authority: CN
Inventors: 张正平
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-07-20
Filing date: 2021-07-20
Publication date: 2022-05-17
Anticipated expiration: 2031-07-20

Abstract

The utility model relates to the field of power technology, and is widely applied to a voltage regulating and stabilizing device, in particular to a three-phase low-voltage compensation device which is simple to control, does not generate inverse peak voltage, is safe and reliable, and has good voltage regulating effect, wherein the three-phase low-voltage compensation device comprises a three-phase compensator T1 and a three-phase regulator T2, the three-phase compensator T1 comprises a primary winding TU, a primary winding TV, a primary winding TW, a primary winding TN and a secondary winding, the three-phase regulator T2 comprises three windings and X taps arranged in the windings, and the taps are respectively a tap XU1, a tap XU2, a tap XU3, a tap XU4, a tap XU5, a tap XU6, a tap XV1, a tap XV2, a tap XV3, a tap XV4, a tap XV5, a tap XV6, a tap XW1, a tap XW2, a tap XW3, a tap XW4, a tap XW5, a tap XW6 and a primary winding TN.

Description

Three-phase low-voltage compensation device

Technical Field

The utility model relates to the field of electric power technology, is widely applied to voltage regulating and stabilizing devices, and particularly relates to a three-phase low-voltage compensation device.

Background

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 is an important property of electricity, and is an important parameter of the energy supply characteristic of a power supply, and is a primary factor to be considered in the matching between power supply and electric equipment.

The electricity is a product of the civilized society, and promotes the development of the civilized society, the use degree of the electricity is closely related to the civilized society, the index of the civilized society is that the scientific technology develops rapidly, the socialization degree of the production is higher, the production scale is larger and larger, the technical requirement is more and more complex, the division of labor is more and more detailed, and the coordination of each production link is more and more important. The voltage value, the voltage standard value and their classification are one of the contents that need to be coordinated. All the parts are coordinated and consistent as much as possible, so that a relatively stable stage can be achieved, the interchangeability and the universality of the electrical equipment are improved, the customized electrical equipment is reduced, the efficient and large-scale production service of the electrical equipment is realized, and the production cost caused by the unmatched voltage values is reduced.

And 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 in the range of 110-120% of the rated voltage value and is continuous

Voltage change 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;

eighthly, unbalance of three-phase voltage: 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 safe voltage requirement of the electric equipment, namely, the voltage difference change of the voltage of the electric equipment is within +/-5%. Some requirements are higher, namely the voltage difference change of the terminal of the electric equipment is less than or equal to 2.5 percent, and the unbalance degree of the three-phase voltage is less than or equal to 2.6 percent. At present, voltage regulating devices on the market mainly comprise an unloaded voltage regulating transformer, an loaded voltage regulating transformer, reactive compensation equipment, a VQC voltage reactive power control device, an induction type voltage regulator and a carbon brush type alternating current voltage stabilizer, but the products have the following defects: firstly, the no-load voltage regulating transformer has low cost and reliable performance, but cannot be synchronously adjusted along with the voltage change and can only be adjusted after power failure; the on-load tap changer can be synchronously adjusted along with the voltage change, but is provided with an on-load tap changer, so that the generation of electric arcs is difficult to avoid when the voltage is adjusted, and the on-load tap changer needs to be maintained frequently; the reactive compensation equipment has reliable performance, but can only repair the voltage change caused by reactive power and cannot repair the voltage change caused by active power; the VQC voltage reactive power control device can ensure the voltage quality, optimize the reactive power flow of the power grid, play an important role in the economic operation of the power grid and the like, and the continuous working safety time of the VQC voltage reactive power control device is less than or equal to 1000 hours; the response speed of the induction type voltage regulator is low although reliable, the voltage regulating speed is less than or equal to 5V/S, the efficiency is less than or equal to 93 percent, and the voltage stabilizing precision is less than or equal to +/-5 percent; and sixthly, the voltage regulating speed of the carbon brush type alternating current voltage stabilizer is less than or equal to 25V/S, and regular maintenance is needed.

The applicant also found that the no-load voltage regulating transformer can not be adjusted synchronously with the voltage change, and can only be adjusted after power failure, so that the no-load voltage regulating transformer is troublesome to use and cannot play an effective voltage stabilizing role. It is also found that when the voltage rises, the exciting current of the transformer is increased, the magnetic induction intensity B in the iron core is increased, the iron loss is increased, and the temperature rise of the iron core is increased to accelerate the insulation aging of the winding; secondly, the on-load tap changer is easy to generate electric arc when adjusting voltage. It is also found that if the maintenance is not timely, short-time undervoltage of power supply can be caused, so that advanced power utilization equipment stops working or is damaged, even voltage breakdown of a power supply system can be caused, and adverse effects are brought to production, operation and working life of the power utilization area; and thirdly, the reactive compensation equipment cannot repair voltage change caused by active power. It was also found that the reactive power of the capacitor is proportional to the square of the voltage, and the voltage rise increases the reactive power, but the partial discharge is intensified by the electric field increase, and the insulation life is reduced, and if the capacitor is operated for a long time under 1.1UN, the life is reduced to about 44% of the rated life. It is also found that the phenomena of explosion of the capacitor, bulging of the shell and the like are caused by partial discharge and insulation aging accumulation effects, so that the expected service life of the reactive power compensation device and the safe operation of power supply are seriously influenced by high voltage; and fourthly, the VQC voltage reactive power control device can cause short-time undervoltage of power supply if the continuous working safety time is more than or equal to 1000 hours and the maintenance is not timely, so that advanced power utilization equipment stops working or is damaged, and even a power supply system in the power utilization area is collapsed. Meanwhile, the root causes of the third step are caused by unreasonable voltage-regulating tap joints of the power transformer and unreliable on-load voltage-regulating tap joint switches; an induction type voltage regulator, the voltage regulating speed is less than or equal to 5V/S, the efficiency is less than or equal to 93 percent, and the voltage stabilizing precision is less than or equal to +/-5 percent; and sixthly, the voltage regulating speed of the carbon brush type alternating current voltage stabilizer is less than or equal to 25V/S, and regular maintenance is needed. It has also been found that if the carbon brush is not maintained regularly, when the carbon brush is worn seriously, the copper column is burnt off and the power supply is affected, and the safety accident is caused seriously.

In view of the above technical problems, the applicant invented: the present invention relates to a three-phase low-voltage compensation device, and more particularly, to a three-phase high-voltage regulation device, a second high-voltage regulation device, a third three-phase low-voltage compensation device, a fourth low-voltage compensation device, a fifth voltage quality restoration device, a sixth economical three-phase ac voltage stabilizer, and a seventh economical ac voltage stabilizer.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problems, the utility model provides the three-phase low-voltage compensation device which is simple to operate, safe and reliable and good in voltage regulation effect.

The technical scheme of the utility model is that the three-phase low-voltage compensation device comprises a three-phase compensator T1 and a three-phase regulator T2, wherein the three-phase compensator T1 comprises a primary winding TU, a primary winding TV, a primary winding TW, a primary winding TN and a secondary winding, the three-phase regulator T2 comprises three windings and X taps arranged in the windings, and the taps are respectively a tap XU1, a tap XU2, a tap XU3, a tap XU4, a tap XU5, a tap XU6, a tap XV1, a tap XV2, a tap XV3, a tap XV4, a tap XV5, a tap XV6, a tap XW1, a tap XW2, a tap XW3, a tap XW4, a tap XW5, a tap XW6 and the primary winding TN.

Further improved, the three-phase compensator comprises a bidirectional thyristor VTXU, a bidirectional thyristor VTXV, a bidirectional thyristor VTXW, a bidirectional thyristor VTXX1, a bidirectional thyristor VTXY 685XY 1, a bidirectional thyristor VTXY 6856856854, a bidirectional thyristor VTXY 685XV 1, a bidirectional thyristor VTXY1, a bidirectional thyristor VTXZ 6856856856856854, a bidirectional thyristor VTXZ1 and a bidirectional thyristor VTXZ1, a three-phase tap compensator T1, a three-phase tap XU1, a bidirectional thyristor VTXX1 and a three-phase-tap XU1, a three-phase-tap XU1, a bidirectional thyristor VTX-X-1, a compensator and a bidirectional thyristor 1, a three-X1, a bidirectional thyristor 1, a three-and a three-X-and a bidirectional thyristor 1, a bidirectional thyristor 1 connected to the said three-and a bidirectional thyristor 1, The T2 tap XU5 is connected with a bidirectional thyristor VTXX5, the three-phase compensator T2 tap XU6 is connected with a bidirectional thyristor VTXX6, the A phase input end of the T2 is connected with a bidirectional thyristor VTXX7, the three-phase compensator T2 tap XV1 is connected with a bidirectional thyristor VTXY1, the three-phase compensator T2 tap XV3 is connected with a bidirectional thyristor VTXY2, the three-phase compensator T2 tap XV3 is connected with a bidirectional thyristor VTXY3, the three-phase compensator T2 tap XV4 is connected with a bidirectional thyristor VTXY 387XY 4, the three-phase compensator T2 tap XV5 is connected with a bidirectional thyristor VTXY5, the three-phase compensator T2 tap XV6 is connected with a bidirectional thyristor VTXY6, the B phase input end of the bidirectional thyristor T6 is connected with a bidirectional thyristor VTXY6, the three-phase compensator T6 tap XW6 is connected with a bidirectional thyristor VTXZ6, the three-phase compensator T6 tap XZ6 is connected with a bidirectional thyristor VTXZ6, The three-phase compensator T tap XW is connected with a bidirectional thyristor VTXZ, the C-phase input end of the three-phase compensator T is connected with a bidirectional thyristor VTXZ, the other ends of the bidirectional thyristors VTXX, VTXXX are connected with a three-phase compensator T primary winding TU, the other ends of the bidirectional thyristors VTXY, VTXY are connected with a T primary winding TV, the other ends of the bidirectional VTXZ, VTXZ are connected with a T primary winding TW, the T primary winding TU is further connected with a bidirectional thyristor VTXV, the primary winding TW of the T1 is also connected to a triac VTXW, which is also connected to the primary winding TN of the T1.

The three-phase regulator comprises a three-phase control protection switch QF, wherein the A-phase input end of the three-phase regulator T2, the B-phase input end of the bidirectional thyristor T2 and the C-phase input end of the bidirectional thyristor T2 are respectively connected to one end of the three-phase control protection switch QF, and the other end of the three-phase control protection switch QF is respectively connected to the three-phase voltage output end.

In a further refinement, the primary winding TN is connected to the input N line.

The system is characterized by further comprising a man-machine system device, a main control system device and a driving system device, wherein the three-phase input voltage, the three-phase input current, the three-phase output voltage and the three-phase output current, each group of three-phase compensator T1 and each group of three-phase regulator T2 are connected to the main control system device, the man-machine system device and the driving system device are connected to the main control system device, the man-machine system device is a touch screen operation interface, and the main control system device controls the three-phase compensator T1 and the three-phase regulator T2 to work through the driving system device.

In a further improvement, the system also comprises a combination of more than 1 three-phase compensator T1 and three-phase regulator T2 which are connected in series or in parallel.

By adopting the technical scheme, the utility model has the beneficial effects that: the utility model provides a three-phase low-voltage compensation device, which is shown in the attached drawing 1 in detail:

when the power is switched on or the input voltage is equal to the rated voltage, the main control system device controls the bidirectional thyristors in the T2 to be turned off (namely: see table I in detail), and the bidirectional thyristors in the T1 to be turned on, namely VTXU, VTXV and VTXW, and short-circuits the primary windings TU, TV and TW and the primary winding TN, so that the input voltage is equal to the output voltage;

when the input voltage is lower than the rated voltage, the main control system device controls the bidirectional thyristors VTXU, VTXV and VTXW in the T1 to be switched off, and the bidirectional thyristors corresponding to the T2 are switched on (namely, see table II in detail), so that the T2 supplies power to the primary winding of the T1, and performs voltage compensation on the secondary winding, and finally, the output voltage is equal to the rated voltage;

the utility model has the advantages of simple control, no generation of peak-to-peak voltage, safety, reliability, quick response time of 60 milliseconds, wide input voltage of more than or equal to 70 percent of rated value, voltage stabilization precision of less than or equal to 3 percent, efficiency of more than or equal to 99 percent, abnormal uninterrupted bypass direct connection function, under-voltage and over-voltage alarm function, large rated capacity (determined according to the voltage stabilization range), continuous safe operation time of more than or equal to 12 months and service life of more than or equal to 240 months. Can overcome and supplement the defects of products on the market.

Drawings

FIG. 1 is a schematic circuit diagram of a three-phase low-voltage compensation apparatus according to an embodiment of the present invention;

FIG. 2 is a diagram of an interface of the human machine system device of the embodiment of the utility model shown in FIG. 1;

FIG. 3 is a diagram of an interface of the human machine system device of an embodiment of the utility model shown in FIG. 2;

FIG. 4 is a diagram of an interface of the human-machine system device in an embodiment of the utility model shown in FIG. 3.

Detailed Description

The utility model is described in further detail below with reference to the following figures and detailed description:

as shown in fig. 1: a three-phase low voltage compensation device comprises a three-phase compensator T1 and a three-phase regulator T2, wherein the three-phase compensator T1 comprises a primary winding TU, a primary winding TV, a primary winding TW, a primary winding TN and a secondary winding, the three-phase regulator T2 comprises three windings and X taps arranged in the windings, the taps are respectively a tap XU1, a tap XU2, a tap XU3, a tap XU4, a tap XU5, a tap XU6, a tap XV6, a tap XW6, a tap XV6, a tap VTXW 6, a tap VTXV 6, a tap VTXX6 and a primary winding, and the bidirectional VTXV 6, and the bidirectional thyristor XX6, the primary winding XX6, the bidirectional thyristor 6, the VTXX6, the tap XV6, the bidirectional thyristor 6, the primary winding XX6, the bidirectional thyristor and the bidirectional XV6, A bidirectional thyristor VTXY, a bidirectional thyristor VTXXY, a bidirectional thyristor VTXZ and a bidirectional thyristor VTXZ, the T tap XU is connected to the bidirectional thyristor VTXX, the T tap XV is connected to the bidirectional thyristor VTXY, the T tap VTV is connected to the bidirectional thyristor VTXY, The T tap XV is connected to the bidirectional thyristor VTXY, the T tap XW is connected to the bidirectional thyristor VTXZ, the T2 phase input is connected to the bidirectional thyristor VTXZ, the bidirectional thyristors VTXX, VTXX are connected to the T primary winding TU, the other ends of the bidirectional thyristors VTXY, VTXY is connected to the T primary winding TV, the other ends of the bidirectional thyristors VTXZ, VTTW are connected to the T primary winding TV, the T1 primary winding TU is further connected with a bidirectional thyristor VTXU, the T1 primary winding TV is further connected with a bidirectional thyristor VTXV, the T1 primary winding TW is further connected with a bidirectional thyristor VTXW, the bidirectional thyristors VTXU, VTXV and VTXW are further connected with the T1 primary winding TN, the three-phase regulator T2 comprises a three-phase control protection switch QF, an A phase input end of the three-phase regulator T2, a B phase input end of the T2 and a C phase input end of the T2 are respectively connected with one end of the three-phase control protection switch QF, the other end of the three-phase control protection switch QF is respectively connected with a three-phase voltage output end, the primary winding TN is connected with an input N line, the three-phase input voltage, current and three-phase output voltage, current and each group of the three-phase compensator T1 and the three-phase regulator T2 are connected with a main control system device, the three-phase input voltage, current and the three-phase compensator are respectively connected with the main control system device, the man-machine system device is a touch screen operation interface, and the main control system device controls the three-phase compensator T1 and the three-phase regulator T2 to work through the driving system device; fig. 2-4 are interface diagrams of the man-machine system device of the present invention, including voltage display, current display, technical parameter setting display, technical parameter resetting, and main view display: the input voltage comprises a current value, a maximum value and a minimum value which are automatically recorded in real time, the output voltage comprises a current value, a maximum value and a minimum value which are automatically recorded in real time, the current comprises a current value and a maximum value and a minimum value which are automatically recorded in real time, the technical parameter setting display comprises a rated voltage value, a voltage-stabilizing precision value, a voltage-stabilizing threshold value setting value, a voltage regulation mode, a working mode, an abnormal three-phase unbalance protection value, an abnormal overvoltage protection value, an abnormal undervoltage protection value, an input fault processing mode and a voltage-stabilizing fault processing mode, and the technical parameter resetting comprises a rated voltage value, a voltage-stabilizing precision value, a voltage-stabilizing threshold value setting value, a voltage regulation mode, a working mode, an abnormal three-phase unbalance protection value, an abnormal overvoltage protection value, an abnormal undervoltage protection value, "input fault processing mode" and "voltage stabilization fault processing mode".

The low-voltage compensation mode of the utility model also comprises a combination of more than 1 three-phase compensator T1 and three-phase adjuster T2 which are connected in series or in parallel. Are also within the scope of the present invention.

The working principle is as follows: when the power-on or the input voltage is equal to the rated voltage, the main control system device controls the bidirectional thyristors in T2 to be turned off (i.e., see Table one in detail), and the bidirectional thyristors VTXU, VTXV and VTXW in T1 to be turned on, so as to short-circuit the primary windings TU, TV and TW and the primary winding TN, thereby making the input voltage equal to the output voltage, as shown in Table one:

watch 1

When the input voltage is lower than the rated voltage, the main control system device controls the thyristors VTXU, VTXV and VTXW in T1 to turn off, and the corresponding triac in T2 to turn on (i.e., see table two for details), so that T2 supplies power to the primary winding of T1, and compensates the voltage of the secondary winding, and finally the output voltage is equal to the rated voltage value, as shown in table 2:

watch two

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 utility model, which should also be viewed as the protection of the utility model.

Claims

1. A three-phase low-voltage compensation device is characterized in that: the three-phase compensator T1 and the three-phase adjuster T2 are included, the three-phase compensator T1 comprises a primary winding TU, a primary winding TV, a primary winding TW, a primary winding TN, and a secondary winding, the three-phase adjuster T2 comprises three windings and X taps arranged in the windings, the taps are a tap XU1, a tap XU2, a tap XU3, a tap XU4, a tap XU5, a tap XU6, a tap XV1, a tap XV2, a tap XV3, a tap XV4, a tap XV5, a tap XV 84 6, a tap XW1, a tap XW2, a tap XW 53, a tap XW4, a tap XW5, a tap XW6, and the primary winding TN.

2. A three-phase low voltage compensation apparatus according to claim 1, wherein: the bidirectional thyristor VTXU, the bidirectional thyristor VTXV, the bidirectional thyristor VTXW, the bidirectional thyristor VTXX, the bidirectional thyristor VTXY, the bidirectional thyristor VTXZ and the bidirectional thyristor VTXZ are also included, the three-phase compensator T tap XU is connected with the bidirectional thyristor VTXX, the three-phase compensator T tap XZ is connected with the bidirectional thyristor VTXX, the three-phase compensator T tap XU is connected with the bidirectional thyristor VTXX, the T tap XU is connected with the bidirectional thyristor VTXX, The three-phase compensator T2 tap XU6 is connected to the bidirectional thyristor VTXX6, the A-phase input end of the three-phase compensator T2 is connected to the bidirectional thyristor VTXX7, the T2 tap XV1 is connected to the bidirectional thyristor VTXY1, the three-phase compensator T2 tap XV3 is connected to the bidirectional thyristor VTXY2, the T2 tap XV3 is connected to the bidirectional thyristor VTXY3, the T2 tap XV4 is connected to the bidirectional thyristor VTXY4, the three-phase compensator T2 tap XV5 is connected to the bidirectional thyristor VTXY5, the three-phase compensator T5 tap XV5 is connected to the bidirectional thyristor VTXY5, the B-phase input end of the T5 tap XV5 is connected to the bidirectional thyristor VTXY5, the T5 tap XV5 is connected to the bidirectional thyristor VTXZ5, the T5 tap XV5 is connected to the bidirectional thyristor 5, the VTXZ5 tap 5 is connected to the bidirectional thyristor 5, the VTXZ5 is connected to the bidirectional thyristor 5, the T5 is connected to the bidirectional thyristor VTXZ5 is connected to the bidirectional thyristor 5, the bidirectional thyristor VTXZ5 is connected to the three-phase compensator T5 tap XV5 is connected to the VTX 5, The T2 tap XW6 is connected to a bidirectional thyristor VTXZ6, the C-phase input end of the T2 is connected to a bidirectional thyristor VTXZ7, the other end of the bidirectional thyristor VTXX1, the bidirectional thyristor VTXX2, the bidirectional thyristor VTXX3, the bidirectional thyristor VTXX4, the bidirectional thyristor VTXX5, the bidirectional thyristor VTXXX 5, and the bidirectional thyristor VTXXX 6856854 are connected to the primary winding TU of the three-phase compensator T5, the other end of the bidirectional thyristor VTXY5, the primary winding TV of the three-phase compensator T5, the bidirectional thyristor VTXZ5, the primary winding TW 5, the other end of the bidirectional thyristor VTXZ5 is connected to the primary winding TV 5, the primary winding TV of the three-phase compensator T1 is further connected to a triac VTXV, the primary winding TW of the three-phase compensator T1 is further connected to a triac VTXW, and the triacs VTXU, VTXV, VTXW are further connected to the primary winding TN of the three-phase compensator T1.

3. A three-phase low voltage compensation apparatus according to claim 2, wherein: the three-phase voltage regulating circuit further comprises a three-phase control protection switch QF, wherein the A-phase input end of the three-phase regulator T2, the B-phase input end of the three-phase compensator T2 and the C-phase input end of the three-phase compensator T2 are respectively connected to one end of the three-phase control protection switch QF, and the other end of the three-phase control protection switch QF is respectively connected to the three-phase voltage output end.

4. A three-phase low voltage compensation apparatus according to claim 3, wherein: the primary winding TN is connected to the input N line.

5. A three-phase low voltage compensation apparatus according to claim 1, wherein: the three-phase compensator comprises a main control system device, a man-machine system device, a main control system device and a driving system device, wherein three-phase input voltage, three-phase current, three-phase output voltage and three-phase output current, each group of three-phase compensator T1 and each group of three-phase regulator T2 are connected to the main control system device, the man-machine system device and the driving system device are connected to the main control system device, the man-machine system device is a touch screen operation interface, and the main control system device controls the three-phase compensator T1 and the three-phase regulator T2 to work through the driving system device.

6. A three-phase low voltage compensation apparatus according to claim 1, wherein: the three-phase compensator also comprises a combination of more than 1 three-phase compensator T1 and a three-phase regulator T2 which are connected in series or in parallel.