CN216564522U

CN216564522U - Low-voltage compensation device

Info

Publication number: CN216564522U
Application number: CN202121653674.3U
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 voltage regulation and stabilization devices, in particular to a low-voltage compensation device which is simple to control, does not generate inverse peak voltage, is safe and reliable and has good voltage regulation effect, and comprises a 3N compensator T1 and a 3N regulator T2, wherein the 3N compensator T1 comprises a primary winding 3N1, a primary winding 3N2, a primary winding 3N3, a primary winding 3N4, a primary winding 3N5, a primary winding 3N6 and a secondary winding, the 3N regulator T2 comprises three windings and N joints arranged in the windings, and the joints are respectively a joint 3NA1, a joint 3NA2, a joint 3NA3, a joint 3NA4, a joint 3NA5, a joint 3NA6, a joint 3NB6, a joint NB6, a joint 6 and a joint 6, a joint NB 3NB6, a joint 6 and a joint 6853 NB6, Joint 3NB9, joint 3NB10 and joint 3NC1, joint 3NC2, joint 3NC3, joint 3NC4, joint 3NC5, joint 3NC6, joint 3NC7, joint 3NC8, joint 3NC9, and joint 3NC 10.

Description

Low-voltage compensation device

Technical Field

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

Background

Electric power is one of the most important energy sources used in modern industry and agriculture and modern society life, and voltage changes widely affect various industrial electric equipment. 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, the electricity 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 the classification thereof are one of the contents that need to be coordinated. All the parties are coordinated as much as possible to achieve a relatively stable stage, so that 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 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;

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 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 electric equipment stops working or is damaged, even voltage breakdown of a power supply system can be caused, and adverse effects are brought to production, management and working life of the power utilization area; and thirdly, the reactive compensation equipment cannot repair voltage change caused by active power. It has also been found that the reactive power of its capacitance is proportional to the square of the voltage, and that the voltage rise, although the reactive power increases, increases the partial discharge due to the field enhancement, reducing the insulation life, and that if it is operated for a long time at 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 low voltage compensation device, and more particularly, to a low voltage compensation device, which includes a first three-phase high voltage regulation device, a second high voltage regulation device, a third three-phase low voltage compensation method, a fourth low voltage compensation method, 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 low-voltage compensation device which is simple to operate, safe and reliable and has a good voltage regulation effect.

The technical scheme of the utility model is that the low-voltage compensation device comprises a 3N compensator T and a 3N regulator T, wherein the 3N compensator T comprises a primary winding 3N, a primary winding 3N and a secondary winding, the 3N regulator T comprises three windings and N joints arranged in the windings, and the joints are respectively a joint 3NA, a joint 3NB, a joint 3NC, a joint 3N, a primary winding 3N, a secondary winding, and a joint 3N Linker 3NC8, linker 3NC9, linker 3NC 10.

The improved circuit further comprises a control protection switch QF1, a control protection switch QF2 and a control protection switch QF3, wherein the control protection switch QF1 is connected to a connector 3NA1 of the 3N regulator, the control protection switch QF2 is connected to a connector 3NB1 of the 3N regulator T2, the control protection switch QF3 is connected to a connector 3NC1 of the 3N regulator T2, and the other ends of the control protection switch QF1, the control protection switch QF2 and the control protection switch QF3 are respectively connected to an A-phase output end, a B-phase output end and a C-phase output end.

Further improved by further comprising a bidirectional thyristor SCRU, a bidirectional thyristor SCRV, a bidirectional thyristor SCRRW and a bidirectional thyristor SCRRW, the primary winding 3N of the 3N compensator T is connected to the bidirectional thyristor RU, the bidirectional thyristor SCRU, the SCRU, SCRW, SCRU, SCRW, SCRU, SCRW, SCRU, SCRW, SCRU, SCRW, SCRU, and SCRW, SCRU, SCRW, SCRU, and SCRW, SCRU, SCRW, SCRU, and SCRW, etc. in the 3N, wherein the 3N is included in the 3N regulator T, and SCRU, wherein the 3N regulator T, are included in the 3N regulator T, and SCRU, are included in the 3N, and SCRU, and the 3N, One end of bidirectional thyristor SCRU, and bidirectional thyristor SCRU, the primary winding 3N is connected to the joint 3NA in the 3N regulator T, the primary winding 3N is connected to the bidirectional thyristor SCRV, and bidirectional thyristor SCRV in the 3N regulator T, the primary winding 3N is connected to the joint 3NB in the 3N regulator T, the primary winding 3N is connected to the bidirectional thyristor SCRW, and SCRW in the 3N regulator T, the primary winding 3N is connected to the bidirectional thyristor SCRW, the SCRU, the bidirectional thyristor SCRU, the SCRU and the SCRU in the 3N regulator T, The primary winding 3N is connected with a joint 3NC in a 3N regulator T, and the other ends of the bidirectional thyristor SCRU, the bidirectional thyristor SCRU and the bidirectional thyristor SCRU are respectively connected with a joint 3NA, a joint 3NA and a joint 3NA, and the other ends of the bidirectional thyristor SCRV, the bidirectional thyristor SCRV and the SCRV are respectively connected with the joint 3NB 3NC, The connector 3NB9, the connector 3NB8, the connector 3NB7, the connector 3NB6 and the connector 3NB6, the bidirectional thyristor SCRW6 and the bidirectional thyristor SCRW6 are respectively connected with the connector 3NC6, the connector 3NC6, the connector 6 and the connector 6, and the connector 3NC6 are respectively connected with an input N wire.

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 current, the three-phase output voltage, the three-phase current and each group of 3N compensator T1 and 3N adjuster 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 3N compensator T1 and the 3N adjuster T2 to work through the driving system device.

In a further improvement, the system also comprises a combination of more than one 3N compensator T1 and 3N adjuster T2 which are connected in series or in parallel, and a combination of 1 single-phase compensator T1 and single-phase adjuster T2 and more than 1 single-phase compensator T1 and single-phase adjuster T2.

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

when powered, the main control system device controls the primary winding of T1 to short, thereby making the input voltage equal to the output voltage.

When the input voltage is equal to the rated voltage, the main control system device controls the primary windings 3N1, 3N3 and 3N5 of the T1 and the joints 3NA10, 3NB10 and 3N10 of the T2 to be switched on, 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 primary windings 3N1, 3N3 and 3N5 of the T1 to be disconnected with the joints 3NA10, 3NB10 and 3N10 in the T2, and simultaneously to be connected with the corresponding three joints, so that the output voltage is equal to the rated voltage value.

When the input voltage returns to the rated voltage again, the main control system device controls the primary windings 3N1, 3N3 and 3N5 of the T1 to be disconnected with the three joints which are previously connected with the T2, and simultaneously connected with the primary windings 3NA10, 3NB10 and 3N10, so that the input voltage is equal to the rated voltage.

When the input three-phase voltage is unbalanced, for example: sudden A-phase voltage reduction by 10%, B-phase reduction by 15%, and C-phase reduction still at the rated voltage value, when: the main control system device controls the primary winding 3N1 of the T1 to be disconnected with the originally-connected connector T3 NA10 of the T2 and the originally-connected connector of the primary winding 3NB and the T2, and simultaneously, the two corresponding connectors are respectively connected, so that the output voltage is equal to the rated voltage and the three-phase voltage is balanced.

The utility model has simple control, no inverse peak voltage, safety and reliability, 60MS response time, more than or equal to 80 percent of input voltage, less than or equal to 2 percent of output voltage precision, more than or equal to 98.8 percent of efficiency, unbalanced input three-phase voltage, automatic balance of output three-phase voltage, uninterrupted bypass direct connection function, undervoltage and overvoltage function, large rated capacity (determined according to the voltage stabilizing range), continuous safe operation time more than or equal to 12 months and service life more than or equal to 240 months.

Drawings

FIG. 1 is a schematic circuit diagram of a low voltage compensation device 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 a 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 3N compensator T1 and a 3N regulator T2, wherein the 3N compensator T1 comprises a primary winding 3N1, a primary winding 3N2, a primary winding 3N3, a primary winding 3N4, a primary winding 3N5, a primary winding 3N6 and a secondary winding, the 3N regulator T2 comprises three windings and N joints arranged in the windings, the joints are a joint 3NA1, a joint 3NA2, a joint 3NA3, a joint 3NA4, a joint 3NA5, a joint 3NA6, a joint 3NA7, a joint 3NA8, a joint 3NA9, a joint 3NA10 and a joint 3NB1, a joint 3NB2, a joint 3NB3, a joint 3NB4, a joint 6853 NB4, a joint 6853 NB4, a joint 6853 NC4, a joint 4 and a joint 6853 NC4, a joint 6853 NC4, a joint 6853 NC4 and a joint 4, a joint 6853 NC4 joint 4, a joint 6853 NC4, a joint 4 and a joint 4 joint 6853 NC4, a joint 4, a joint 6853 NC4 and a joint 6853 NC4, a joint 4 joint 6853 NC4, a joint 6853 NC4 joint 4 and a joint 4, a joint 4 joint 6853 NC4 joint 4, a joint 6853 NC4 joint 6853 NC4 and a joint 4, a joint 6853 NC4, a joint 4 and a joint 6853 NC4 joint 4, a joint 4 and a joint 4, a joint 6853 NC4 joint 4 and a joint 6853 NC4, The joint 3NC9 and the joint 3NC10 further comprise a control protection switch QF1, a control protection switch QF2 and a control protection switch QF3, the control protection switch QF1 is connected to the joint 3NA1 of the 3N regulator, the control protection switch QF2 is connected to the 3NB1 of the joint 3N regulator T2, the control protection switch QF1 is connected to the joint 3NC1 of the 3N regulator T1, the control protection switch QF1 and the control protection switch QF1 are respectively connected to an A-phase output end, a B-phase output end and a C-phase output end, and further comprise a bidirectional thyristor SCRU1, a bidirectional thyristor RV1, a bidirectional thyristor SCRU1, a bidirectional thyristor 1 and a bidirectional thyristor RV1, Bidirectional thyristor SCRV5, bidirectional thyristor SCRV6, bidirectional thyristor SCRV7, bidirectional thyristor SCRV8, bidirectional thyristor SCRV9, bidirectional thyristor SCRV10, bidirectional thyristor SCRW1, bidirectional thyristor SCRW2, bidirectional thyristor SCRW3, bidirectional thyristor SCRW4, bidirectional thyristor SCRW5, bidirectional thyristor SCRW6, bidirectional thyristor SCRW7, bidirectional thyristor SCRW8, bidirectional thyristor SCRW9 and bidirectional thyristor SCRW10, primary winding 3N1 of 3N compensator T1 is connected to one end of bidirectional thyristor SCRU1, bidirectional thyristor SCRU2, bidirectional thyristor SCRU3, bidirectional thyristor SCRU4, bidirectional thyristor SCRU5, bidirectional thyristor SCRU6, bidirectional thyristor SCRU7, bidirectional thyristor SCRU8, bidirectional thyristor SCRU9, bidirectional thyristor SCRU10 in 3N adjuster T2, primary winding 6853N 2 of bidirectional thyristor SCRU 6853N 2 is connected to one end of said bidirectional thyristor SCRU2, and SCRU 6853N 2 in said bidirectional thyristor SCRU 6853N 2 adjuster, Bidirectional thyristor SCRV2, bidirectional thyristor SCRV3, bidirectional thyristor SCRV4, bidirectional thyristor SCRV5, bidirectional thyristor SCRV6, bidirectional thyristor SCRV7, bidirectional thyristor SCRV8, bidirectional thyristor SCRV9 and bidirectional thyristor SCRV10, the primary winding 3N4 is connected to the junction 3NB10 of the 3N regulator T2, the primary winding 3N5 is connected to the bidirectional thyristor SCRW1, bidirectional thyristor SCRW2, bidirectional thyristor SCRW3, bidirectional thyristor SCRW4, bidirectional thyristor SCRW5, bidirectional thyristor SCRW6, bidirectional thyristor SCRW7, bidirectional thyristor SCRW8, bidirectional thyristor SCRW9 and SCRW10 of the 3N regulator T2, the primary winding 3N6 is connected to the junction 3NC10 of the 3N regulator T2, bidirectional thyristor SCRU10, SCRW10, SCRU10 and SCRU10, and SCRU10, The other end of the bidirectional thyristor SCRU1 is respectively connected to a connector 3NA10, a connector 3NA9, a connector 3NA8, a connector 3NA7, a connector 3NA6, a connector 3NA5, a connector 3NA4, a connector 3NA3, a connector 3NA2, and a connector 3NA1, the other end of the bidirectional thyristor SCRU10, a bidirectional thyristor SCRV9, a bidirectional thyristor SCRV8, a bidirectional thyristor SCRV7, a bidirectional thyristor SCRV6, a SCRW6, and a SCRV6 is respectively connected to a connector 3NB6, a connector 6, a SCRW6, a bidirectional thyristor 6, a connector 6, a bidirectional thyristor 6 and the other end of the SCRW6 are respectively connected to a connector 6, the SCRW6, the bidirectional thyristor 6, the two-way of the SCRW6, the two-way of the SCRW6, the two-way thyristor 6, the SCRW6, the two-way thyristor 6 and the two-way of the two-way thyristor 6 and the two-way thyristor 6 are connected to SCRW6, Joint 3NC9, joint 3NC8, joint 3NC7, joint 3NC6, joint 3NC5, joint 3NC4, joint 3NC3, joint 3NC2, joint 3NC1, the joint 3NA10, the joint 3NB10 and the joint 3NC10 are connected with an input N line, and also comprise a man-machine system device, a main control system device and a driving system device, the three-phase input voltage, the three-phase current and the three-phase output voltage, the three-phase 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 man-machine system device and the driving system device are both connected to the main control system device, the man-machine system device is a touch screen operation interface, the main control system device controls the three-phase compensator T1 and the three-phase regulator T2 to work through the driving system device, as shown in fig. 2-4, the human-machine system device can display the "input voltage" interface and the "output voltage" interface in real time; controlling an input voltage interface through an operation interface in the interface, and calculating and displaying the maximum value and the minimum value of phase voltage of the input voltage and the maximum value and the minimum value of running current in real time; the low-voltage compensation device comprises more than 1 three-phase compensator T1 and three-phase adjuster T2 which are connected in series or in parallel, and is also in the protection range of the low-voltage compensation device.

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 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 value; as shown in table 2:

watch two

The present invention has been described in detail with reference to the specific examples, but these are not to be construed as limiting the utility model. 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 low voltage compensation device, characterized by: the three-phase three-.

2. A low voltage compensation arrangement according to claim 1, wherein: the protection circuit further comprises a control protection switch QF1, a control protection switch QF2 and a control protection switch QF3, wherein the control protection switch QF1 is connected to a connector 3NA1 of the 3N adjuster, the control protection switch QF2 is connected to a connector 3NB1 of the 3N adjuster T2, the control protection switch QF3 is connected to a connector 3NC1 of the 3N adjuster T2, and the other ends of the control protection switch QF1, the control protection switch QF2 and the control protection switch QF3 are respectively connected to an A-phase output end, a B-phase output end and a C-phase output end.

3. A low voltage compensation arrangement according to claim 2, wherein: also includes bidirectional thyristor SCRU1, bidirectional thyristor SCRU2, bidirectional thyristor SCRU3, bidirectional thyristor SCRU4, bidirectional thyristor SCRU5, bidirectional thyristor SCRU6, bidirectional thyristor SCRU7, bidirectional thyristor SCRU8, bidirectional thyristor SCRU9, bidirectional thyristor SCRU10, bidirectional thyristor SCRV1, bidirectional thyristor SCRV2, bidirectional thyristor SCRV3, bidirectional thyristor SCRV4, bidirectional thyristor SCRV5, bidirectional thyristor SCRV6, bidirectional thyristor SCRV7, bidirectional thyristor SCRV8, bidirectional thyristor SCRV9, bidirectional thyristor SCRV10, bidirectional thyristor SCRW1, bidirectional thyristor SCRW2, bidirectional thyristor SCRU3, bidirectional thyristor SCRW4, bidirectional thyristor SCRW5, bidirectional thyristor 6, bidirectional thyristor SCRW7, bidirectional thyristor SCRW8, bidirectional thyristor SCRU8 and bidirectional thyristor 8, the primary winding of said SCR 6853N compensator 6853 is connected to the bidirectional thyristor SCRU8, SCRU8 and SCRU8, One end of bidirectional thyristor SCRU, primary winding 3N is connected to joint 3NA in 3N adjuster T, primary winding 3N is connected to bidirectional thyristor SCRV, bidirectional thyristor SCRV and bidirectional thyristor SCRV in 3N adjuster T, primary winding 3N is connected to joint 3NB in 3N adjuster T, primary winding 3N is connected to bidirectional thyristor SCRW, bidirectional thyristor SCRU in 3N adjuster T, and the other end of bidirectional thyristor SCRU, The primary winding 3N is connected with a joint 3NC in a 3N regulator T, and the other ends of the bidirectional thyristor SCRU, the bidirectional thyristor SCRU and the bidirectional thyristor SCRU are respectively connected with a joint 3NA, a joint 3NA and a joint 3NA, and the other ends of the bidirectional thyristor SCRV, the bidirectional thyristor SCRV and the SCRV are respectively connected with the joint 3NB and the joint 3NB, The connector 3NB8, the connector 3NB7, the connector 3NB6, the connector 3NB5, the connector 3NB4, the connector 3NB3, the connector 3NB2 and the connector 3NB2, wherein the other ends of the bidirectional thyristor SCRW2, the bidirectional thyristor SCRW2 and the bidirectional thyristor SCRW2 are respectively connected with the connector 3NC2, the connector 2 and the connector 3NC2, and the connector 3NC2 are connected with an input N wire.

4. A low voltage compensation arrangement according to claim 3, wherein: the three-phase input voltage, the three-phase output current and the 3N compensator T1 and the 3N adjuster T2 of each group 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 3N compensator T1 and the 3N adjuster T2 to work through the driving system device.

5. A low voltage compensation arrangement according to claim 1, wherein: the three-phase compensator also comprises a combination of more than one 3N compensator T1 and a 3N regulator T2 which are connected in series or in parallel, a combination of 1 single-phase compensator T1 and a single-phase regulator T2, and a combination of more than 1 single-phase compensator T1 and a single-phase regulator T2.