CN102684212B - Device for automatically adjusting three-phase load imbalance - Google Patents
Device for automatically adjusting three-phase load imbalance Download PDFInfo
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- CN102684212B CN102684212B CN201210181817.4A CN201210181817A CN102684212B CN 102684212 B CN102684212 B CN 102684212B CN 201210181817 A CN201210181817 A CN 201210181817A CN 102684212 B CN102684212 B CN 102684212B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
Abstract
The invention provides a device for automatically adjusting three-phase load imbalance. The device for automatically adjusting the three-phase load imbalance comprises a first logic relay, a second logic relay, a third logic relay, a fourth logic relay, a first contactor, a second contactor, a third contactor, a fourth contactor, a first current monitor CTa, a second current monitor CTb and a third current monitor CTc, wherein the first current monitor CTa, the second current monitor CTb and the third current monitor CTc are connected to a three phase power transmission line; three current monitors and the four logic relays form a detection control loop, and four logic relays and the four contactors form a compensation main loop and a logic control loop. The device automatically adjusts three-phase load imbalance and avoids a phenomenon that user equipment and transformers are burnt due to three-phase load imbalance.
Description
Technical field
The invention belongs to distribution system three-phase load regulation technology field, specifically, relate to a kind of three-phase load unbalance automatic regulating apparatus.
Background technology
At present, the adjustment means of distribution transformer load mainly, first survey load by card, and then manually adjust balance, but this mode also exists various disadvantages: 1, rural power grids load variations is large, season, different load was different, and peak of power consumption, low ebb are all different for every day, must manually adjust continually; When 2, carrying out people's work card survey load, three-phase load at that time can only be reacted, the cyclic variation of distribution transforming can not be reflected; 3, interval certain time interval between twice adjustment, if during this period of time three-phase load change exceeds standard, is then very easy to the equipment that burns out and distribution transforming.
In order to solve above Problems existing, people are seeking a kind of desirable technical solution always.
Summary of the invention
The object of the invention is for the deficiencies in the prior art, thus the three-phase load unbalance automatic regulating apparatus that a kind of structure is simple, easy to use, Adjustment effect is good is provided.
To achieve these goals, the technical solution adopted in the present invention is: a kind of three-phase load unbalance automatic regulating apparatus, it comprises detection record module, Logic control module and Executive Module, described detection record module comprises Current Mutual Inductance test section and data recording portion, and described Current Mutual Inductance test section connects three phase line and carries out stored record to detect three-phase imbalance load data and described three-phase imbalance load data are sent to described data recording portion; Described Logic control module connects described detection record module to carry out Logic judgment to described three-phase imbalance load data thus to draw light load phase; Described Executive Module connects described Logic control module respectively and three phase line adjusts with the auto-compensation carrying out single-phase load according to the Logic judgment result of described Logic control module.
Based on above-mentioned, this automatic regulating apparatus comprises four logic relays, four contactors and three current monitors be connected with three phase line (CTa, CTb, CTc); Described current monitor (CTa, CTb, CTc) and four described logic relays constitute detection control loop, and four described logic relays and four described contactors constitute and compensate major loop and loop control logic;
In described detection control loop, one end of described first current monitor CTa connects one end of described first logic relay coil 1LJ, the other end of described first logic relay coil 1LJ connects one end of described 4th logic relay coil 0LJ, and the other end of described 4th logic relay coil 0LJ connects the other end of described first current monitor CTa; One end of described second current monitor CTb connects one end of described second logic relay coil 2LJ, the other end of described second logic relay coil 2LJ connects one end of described 4th logic relay coil 0LJ, and the other end of described 4th logic relay coil 0LJ connects the other end of described second current monitor CTb; One end of described 3rd current monitor CTc connects one end of described 3rd logic relay coil 3LJ, the other end of described 3rd logic relay coil 3LJ connects one end of described 4th logic relay coil 0LJ, and the other end of described 4th logic relay coil 0LJ connects the other end of described 3rd current monitor CTc;
Described compensation major loop comprises first, second, and third normally opened contact of described first contactor, first, second, and third normally opened contact of described second contactor, first, second, and third normally opened contact of described 3rd contactor and first, second, and third normally opened contact of described 4th contactor, one end of first, second, and third normally opened contact of described first contactor connects single-phase compensation load respectively, and the other end of first, second, and third normally opened contact of described first contactor all connects the A phase of three phase line; One end of first, second, and third normally opened contact of described second contactor connects single-phase compensation load respectively, and the other end of first, second, and third normally opened contact of described second contactor all connects the B phase of three phase line; One end of first, second, and third normally opened contact of described 3rd contactor connects single-phase compensation load respectively, and the other end of first, second, and third normally opened contact of described 3rd contactor all connects the C phase of three phase line; One end of first, second, and third normally opened contact of described 4th contactor connects single-phase compensation load respectively, and the other end of first, second, and third normally opened contact of described 4th contactor connects A, B, C phase of three phase line respectively;
Described loop control logic comprises balance controlling brancher, A phase control branch road, B phase control branch road and C phase control branch road, described balance controlling brancher is by the first normally-closed contact 1LJ-11 of described first logic relay be connected on successively on same circuit, first normally-closed contact 2LJ-11 of described second logic relay, first normally-closed contact 3LJ-11 of described 3rd logic relay, first normally-closed contact 1C-11 of described first contactor, first normally-closed contact 2C-11 of described second contactor, first normally-closed contact 3C-11 and the described 4th contactor coil C of described 3rd contactor form, one end of described balance controlling brancher connects the B phase of three phase line, the other end of described balance controlling brancher connects the A phase of three phase line,
Described A phase control branch road comprises the first normally opened contact 1LJ-21 of described first logic relay, first normally opened contact 0LJ-21 of described 4th logic relay, 4th normally opened contact 1C-24 of described first contactor, second normally-closed contact 2C-12 of described second contactor, second normally-closed contact 3C-12 of described 3rd contactor and described first contactor coil 1C, wherein, one end of first normally opened contact 1LJ-21 of described first logic relay connects the B phase of three phase line by the first normally-closed contact C-11 of described 4th contactor as one end of described A phase control branch road, the other end of the first normally opened contact 1LJ-21 of described first logic relay connects one end of the first normally opened contact 0LJ-21 of described 4th logic relay, the other end of the first normally opened contact 0LJ-21 of described 4th logic relay connects one end of described first contactor coil 1C, one end of 4th normally opened contact 1C-24 of described first contactor connects one end of the first normally opened contact 1LJ-21 of described first logic relay, the other end of the 4th normally opened contact 1C-24 of described first contactor connects one end of the second normally-closed contact 2C-12 of described second contactor, the other end of the second normally-closed contact 2C-12 of described second contactor connects one end of the second normally-closed contact 3C-12 of described 3rd contactor, the other end of the second normally-closed contact 3C-12 of described 3rd contactor connects the other end of the first normally opened contact 0LJ-21 of described 4th logic relay, the other end of described first contactor coil 1C connects the A phase of three phase line as the other end of described A phase control branch road,
Described B phase control branch road comprises the first normally opened contact 2LJ-21 of described second logic relay, second normally opened contact 0LJ-22 of described 4th logic relay, 4th normally opened contact 2C-24 of described second contactor, second normally-closed contact 1C-12 of described first contactor, 3rd normally-closed contact 3C-13 of described 3rd contactor and described second contactor coil 2C, wherein, one end of first normally opened contact 2LJ-21 of described second logic relay connects the B phase of three phase line by the first normally-closed contact C-11 of described 4th contactor as one end of described B phase control branch road, the other end of the first normally opened contact 2LJ-21 of described second logic relay connects one end of the second normally opened contact 0LJ-22 of described 4th logic relay, the other end of the second normally opened contact 0LJ-22 of described 4th logic relay connects one end of described second contactor coil 2C, one end of 4th normally opened contact 2C-24 of described second contactor connects one end of the first normally opened contact 2LJ-21 of described second logic relay, the other end of the 4th normally opened contact 2C-24 of described second contactor connects one end of the second normally-closed contact 1C-12 of described first contactor, the other end of the second normally-closed contact 1C-12 of described first contactor connects one end of the 3rd normally-closed contact 3C-13 of described 3rd contactor, the other end of the 3rd normally-closed contact 3C-13 of described 3rd contactor connects the other end of the second normally opened contact 0LJ-22 of described 4th logic relay, the other end of described first contactor coil 2C connects the A phase of three phase line as the other end of described B phase control branch road,
Described C phase control branch road comprises the first normally opened contact 3LJ-21 of described 3rd logic relay, 3rd normally opened contact 0LJ-23 of described 4th logic relay, 4th normally opened contact 3C-24 of described 3rd contactor, 3rd normally-closed contact 1C-13 of described first contactor, 3rd normally-closed contact 2C-13 of described second contactor and described 3rd contactor coil 3C, wherein, one end of first normally opened contact 3LJ-21 of described 3rd logic relay connects the B phase of three phase line by the first normally-closed contact C-11 of described 4th contactor as one end of described C phase control branch road, the other end of the first normally opened contact 3LJ-21 of described 3rd logic relay connects one end of the 3rd normally opened contact 0LJ-23 of described 4th logic relay, the other end of the 3rd normally opened contact 0LJ-23 of described 4th logic relay connects one end of described 3rd contactor coil 3C, one end of 4th normally opened contact 3C-24 of described 3rd contactor connects one end of the first normally opened contact 3LJ-21 of described 3rd logic relay, the other end of the 4th normally opened contact 3C-24 of described 3rd contactor connects one end of the 3rd normally-closed contact 1C-13 of described first contactor, the other end of the 3rd normally-closed contact 1C-13 of described first contactor connects one end of the 3rd normally-closed contact 2C-13 of described second contactor, the other end of the 3rd normally-closed contact 2C-13 of described second contactor connects the other end of the 3rd normally opened contact 0LJ-23 of described 4th logic relay, the other end of described 3rd contactor coil 3C connects the A phase of three phase line as the other end of described C phase control branch road.
Hinge structure of the present invention has outstanding substantive distinguishing features and marked improvement, and specifically, the present invention can adjust three-phase load unbalance automatically, stops burning of the load unbalanced subscriber equipment that causes of the three characteristics of the middle term and distribution transforming.
Accompanying drawing explanation
Fig. 1 is structured flowchart of the present invention.
Fig. 2 is electrical block diagram of the present invention.
Embodiment
Below by embodiment, technical scheme of the present invention is described in further detail.
As shown in Figure 1, a kind of three-phase load unbalance automatic regulating apparatus, it comprises detection record module, Logic control module and Executive Module, described detection record module comprises Current Mutual Inductance test section and data recording portion, and described Current Mutual Inductance test section connects three phase line and carries out stored record to detect three-phase imbalance load data and described three-phase imbalance load data are sent to described data recording portion;
Described Logic control module connects described detection record module to carry out Logic judgment to described three-phase imbalance load data thus to draw light load phase; Described Executive Module connects described Logic control module respectively and three phase line adjusts with the auto-compensation carrying out single-phase load according to the Logic judgment result of described Logic control module.
As shown in Figure 2, be the electrical block diagram of this automatic regulating apparatus of specific implementation, this automatic regulating apparatus comprises four logic relays, four contactors, three current monitor CTa, CTb, CTc be connected with A, B, C three phase line respectively; Described current monitor CTa, CTb, CTc and four described logic relays constitute detection control loop, and four described logic relays and four described contactors constitute and compensate major loop and loop control logic.
In described detection control loop, one end of described first current monitor CTa connects one end of described first logic relay coil 1LJ, the other end of described first logic relay coil 1LJ connects one end of described 4th logic relay coil 0LJ, and the other end of described 4th logic relay coil 0LJ connects the other end of described first current monitor CTa; One end of described second current monitor CTb connects one end of described second logic relay coil 2LJ, the other end of described second logic relay coil 2LJ connects one end of described 4th logic relay coil 0LJ, and the other end of described 4th logic relay coil 0LJ connects the other end of described second current monitor CTb; One end of described 3rd current monitor CTc connects one end of described 3rd logic relay coil 3LJ, the other end of described 3rd logic relay coil 3LJ connects one end of described 4th logic relay coil 0LJ, and the other end of described 4th logic relay coil 0LJ connects the other end of described 3rd current monitor CTc.
Described current monitor CTa, CTb, CTc detects and records uncompensated load electric current, four described logic relays are by described current monitor CTa, CTb, CTc detects the definite value load current that exceeds the quata, for judging A, B, the balance of C three-phase load, work as A, B, C three-phrase burden balance, described first logic relay coil 1LJ, described second logic relay coil 2LJ and described 3rd logic relay coil 3LJ does not all detect the definite value three-phase load electric current that exceeds the quata, described 4th logic relay coil 0LJ does not detect the definite value zero-sequence current that exceeds the quata yet, therefore described first logic relay, described second logic relay, described 3rd logic relay, described 4th logic relay does not all start, when A phase load is too low, described first logic relay coil 1LJ detects the definite value three-phase load electric current that exceeds the quata, described 4th logic relay coil 0LJ detects the zero-sequence current of the definite value that exceeds the quata, then described first logic relay and described 4th logic relay start, when B phase load is too low, described second logic relay coil 2LJ detects the definite value three-phase load electric current that exceeds the quata, described 4th logic relay coil 0LJ detects the zero-sequence current of the definite value that exceeds the quata, then described second logic relay and described 4th logic relay start, when C phase load is too low, described 3rd logic relay coil 3LJ detects the definite value three-phase load electric current that exceeds the quata, described 4th logic relay coil 0LJ detects the zero-sequence current of the definite value that exceeds the quata, then described 3rd logic relay and described 4th logic relay start.
To the single-phase load mean allocation three parts of total load 15% be no more than as three single-phase compensation loads, the compensation process of three-phase load has been come jointly by described compensation major loop and described loop control logic, wherein, described compensation major loop comprises first of described first contactor, second and the 3rd normally opened contact, first of described second contactor, second and the 3rd normally opened contact, first of described 3rd contactor, second and the 3rd normally opened contact and described 4th contactor first, second and the 3rd normally opened contact, first of described first contactor, second is connected single-phase compensation load respectively with one end of the 3rd normally opened contact, first of described first contactor, second is all connected the A phase of three phase line with the other end of the 3rd normally opened contact, with the A phase by three single-phase compensation load access three phase lines, one end of first, second, and third normally opened contact of described second contactor connects single-phase compensation load respectively, the other end of first, second, and third normally opened contact of described second contactor all connects the B phase of three phase line, with the B phase by three single-phase compensation load access three phase lines, one end of first, second, and third normally opened contact of described 3rd contactor connects single-phase compensation load respectively, the other end of first, second, and third normally opened contact of described 3rd contactor all connects the C phase of three phase line, with the C phase by three single-phase compensation load access three phase lines, one end of first, second, and third normally opened contact of described 4th contactor connects single-phase compensation load respectively, the other end of first, second, and third normally opened contact of described 4th contactor connects A, B, C phase of three phase line respectively, with A, B, C three-phase by three single-phase compensation load access three phase lines.
Described loop control logic comprises balance controlling brancher, A phase control branch road, B phase control branch road and C phase control branch road, by the action of described loop control logic, three-phase compensates load and namely compensates to load unbalanced three phase line by described compensation major loop.
Described balance controlling brancher is by the first normally-closed contact 1LJ-11 of described first logic relay be connected on successively on same circuit, first normally-closed contact 2LJ-11 of described second logic relay, first normally-closed contact 3LJ-11 of described 3rd logic relay, first normally-closed contact 1C-11 of described first contactor, first normally-closed contact 2C-11 of described second contactor, first normally-closed contact 3C-11 and the described 4th contactor coil C of described 3rd contactor form, one end of described balance controlling brancher connects the B phase of three phase line, the other end of described balance controlling brancher connects the A phase of three phase line, to provide the supply voltage needed for described 4th contactor coil C,
Work as A, B, during C three-phrase burden balance, described first logic relay, described second logic relay, described 3rd logic relay, described 4th logic relay does not all start, 4th contactor coil C of described balance controlling brancher is energized, first of described 4th contactor, second and the 3rd normally opened contact close, by the A of three single-phase compensation load access three phase lines, B, C three-phase, simultaneously, first normally-closed contact C-11 of described 4th contactor disconnects, by described first contactor coil 1C, the power supply of described second contactor coil 2C and described 3rd contactor coil 3C disconnects.
Described A phase control branch road comprises the first normally opened contact 1LJ-21 of described first logic relay, first normally opened contact 0LJ-21 of described 4th logic relay, 4th normally opened contact 1C-24 of described first contactor, second normally-closed contact 2C-12 of described second contactor, second normally-closed contact 3C-12 of described 3rd contactor and described first contactor coil 1C, wherein, one end of first normally opened contact 1LJ-21 of described first logic relay connects the B phase of three phase line by the first normally-closed contact C-11 of described 4th contactor as one end of described A phase control branch road, the other end of the first normally opened contact 1LJ-21 of described first logic relay connects one end of the first normally opened contact 0LJ-21 of described 4th logic relay, the other end of the first normally opened contact 0LJ-21 of described 4th logic relay connects one end of described first contactor coil 1C, one end of 4th normally opened contact 1C-24 of described first contactor connects one end of the first normally opened contact 1LJ-21 of described first logic relay, the other end of the 4th normally opened contact 1C-24 of described first contactor connects one end of the second normally-closed contact 2C-12 of described second contactor, the other end of the second normally-closed contact 2C-12 of described second contactor connects one end of the second normally-closed contact 3C-12 of described 3rd contactor, the other end of the second normally-closed contact 3C-12 of described 3rd contactor connects the other end of the first normally opened contact 0LJ-21 of described 4th logic relay, the other end of described first contactor coil 1C connects the A phase of three phase line as the other end of described A phase control branch road, to provide the supply voltage needed for described first contactor coil 1C.
When A phase load is too low, described first logic relay and described 4th logic relay start, first normally-closed contact 1LJ-11 of described first logic relay disconnects, by first of the 4th contactor on described compensation major loop after described 4th contactor coil C dead electricity, second and the 3rd normally opened contact disconnect, now, first normally-closed contact C-11 of described 4th contactor recovers closed, described first contactor coil 1C power supply is connected, and then, first of described first contactor, second and the 3rd normally opened contact close, by the A phase of three single-phase compensation load access three phase lines.First, second, and third normally-closed contact 1C-11,1C-12,1C-13 of described first contactor disconnects, and is disconnected by the power supply of described 4th contactor coil C, described second contactor coil 2C and described 3rd contactor coil 3C.After single-phase compensation load access, transmission line three-phase load recovers in normal value, described first logic relay and described 4th logic relay recover normal, normal condition is also recovered in each contact of described first logic relay and described 4th logic relay, now, described first contactor coil 1C keeps charged by self-holding circuit.
Described B phase control branch road comprises the first normally opened contact 2LJ-21 of described second logic relay, second normally opened contact 0LJ-22 of described 4th logic relay, 4th normally opened contact 2C-24 of described second contactor, second normally-closed contact 1C-12 of described first contactor, 3rd normally-closed contact 3C-13 of described 3rd contactor and described second contactor coil 2C, wherein, one end of first normally opened contact 2LJ-21 of described second logic relay connects the B phase of three phase line by the first normally-closed contact C-11 of described 4th contactor as one end of described B phase control branch road, the other end of the first normally opened contact 2LJ-21 of described second logic relay connects one end of the second normally opened contact 0LJ-22 of described 4th logic relay, the other end of the second normally opened contact 0LJ-22 of described 4th logic relay connects one end of described second contactor coil 2C, one end of 4th normally opened contact 2C-24 of described second contactor connects one end of the first normally opened contact 2LJ-21 of described second logic relay, the other end of the 4th normally opened contact 2C-24 of described second contactor connects one end of the second normally-closed contact 1C-12 of described first contactor, the other end of the second normally-closed contact 1C-12 of described first contactor connects one end of the 3rd normally-closed contact 3C-13 of described 3rd contactor, the other end of the 3rd normally-closed contact 3C-13 of described 3rd contactor connects the other end of the second normally opened contact 0LJ-22 of described 4th logic relay, the other end of described first contactor coil 2C connects the A phase of three phase line as the other end of described B phase control branch road, to provide the supply voltage needed for described second contactor coil 2C.
When B phase load is too low, described second logic relay and described 4th logic relay start, first normally opened contact 2LJ-21 of described second logic relay and the second normally opened contact 0LJ-22 of described 4th logic relay closes, described second contactor coil 2C power supply is connected, thus, first, second, and third normally opened contact of described second contactor closes, by the B phase of three single-phase compensation load access three phase lines.First, second, and third normally-closed contact 2C-11,2C-12,2C-13 of described second contactor disconnects, the power supply of described 4th contactor coil C, described first contactor coil 1C and described 3rd contactor coil 3C is disconnected, the self-holding circuit of described first contactor coil 1C is disconnected simultaneously.After single-phase compensation load access, transmission line three-phase load recovers in normal value, described second logic relay and described 4th logic relay recover normal, normal condition is also recovered in each contact of described second logic relay and described 4th logic relay, now, described second contactor coil 2C keeps charged by self-holding circuit.
Described C phase control branch road comprises the first normally opened contact 3LJ-21 of described 3rd logic relay, 3rd normally opened contact 0LJ-23 of described 4th logic relay, 4th normally opened contact 3C-24 of described 3rd contactor, 3rd normally-closed contact 1C-13 of described first contactor, 3rd normally-closed contact 2C-13 of described second contactor and described 3rd contactor coil 3C, wherein, one end of first normally opened contact 3LJ-21 of described 3rd logic relay connects the B phase of three phase line by the first normally-closed contact C-11 of described 4th contactor as one end of described C phase control branch road, the other end of the first normally opened contact 3LJ-21 of described 3rd logic relay connects one end of the 3rd normally opened contact 0LJ-23 of described 4th logic relay, the other end of the 3rd normally opened contact 0LJ-23 of described 4th logic relay connects one end of described 3rd contactor coil 3C, one end of 4th normally opened contact 3C-24 of described 3rd contactor connects one end of the first normally opened contact 3LJ-21 of described 3rd logic relay, the other end of the 4th normally opened contact 3C-24 of described 3rd contactor connects one end of the 3rd normally-closed contact 1C-13 of described first contactor, the other end of the 3rd normally-closed contact 1C-13 of described first contactor connects one end of the 3rd normally-closed contact 2C-13 of described second contactor, the other end of the 3rd normally-closed contact 2C-13 of described second contactor connects the other end of the 3rd normally opened contact 0LJ-23 of described 4th logic relay, the other end of described 3rd contactor coil 3C connects the A phase of three phase line as the other end of described C phase control branch road, to provide the supply voltage needed for described second contactor coil 2C.
When C phase load is too low, described 3rd logic relay and described 4th logic relay start, first normally opened contact 3LJ-21 of described 3rd logic relay and the 3rd normally opened contact 0LJ-23 of described 4th logic relay closes, described second contactor coil 3C power supply is connected, thus, first, second, and third normally opened contact of described 3rd contactor closes, by the C phase of three single-phase compensation load access three phase lines.First, second, and third normally-closed contact 3C-11,3C-12,3C-13 of described 3rd contactor disconnects, the power supply of described 4th contactor coil C, described first contactor coil 1C and described second contactor coil 2C is disconnected, the self-holding circuit of described second contactor coil 2C is disconnected simultaneously.After single-phase compensation load access, transmission line three-phase load recovers in normal value, described 3rd logic relay and described 4th logic relay recover normal, normal condition is also recovered in each contact of described 3rd logic relay and described 4th logic relay, now, described 3rd contactor coil 3C keeps charged by self-holding circuit.
By the acting in conjunction of described compensation major loop and described loop control logic, single-phase compensation load is automatic adjustable balance in A, B, C three-phase of transmission line, eliminates the trouble of artificial frequent adjustment, significantly reduces the burden of staff.
In order to more safe and reliable, the present invention can arrange warning circuit, when device automatic regulating function still can not balanced load time, described warning circuit module starts reports to the police, attendant drops into this automatic regulating apparatus more again by after artificial for three-phase imbalance load leveling, again automatically adjusts three-phase imbalance load.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; Although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or carry out equivalent replacement to portion of techniques feature; And not departing from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technical scheme scope of request of the present invention protection.
Claims (1)
1. a three-phase load unbalance automatic regulating apparatus, it is characterized in that: it comprises detection record module, Logic control module and Executive Module, described detection record module comprises Current Mutual Inductance test section and data recording portion, and described Current Mutual Inductance test section connects three phase line and carries out stored record to detect three-phase imbalance load data and described three-phase imbalance load data are sent to described data recording portion; Described Logic control module connects described detection record module to carry out Logic judgment to described three-phase imbalance load data thus to draw light load phase; Described Executive Module connects described Logic control module respectively and three phase line adjusts with the auto-compensation carrying out single-phase load according to the Logic judgment result of described Logic control module;
Wherein, described detection record module comprises the first current monitor CTa, the second current monitor CTb and the 3rd current monitor CTc, described Logic control module comprises the first logic relay, the second logic relay, the 3rd logic relay and the 4th logic relay, and described Executive Module comprises the first contactor, the second contactor, the 3rd contactor and the 4th contactor;
Described first current monitor CTa, described second current monitor CTb are connected with three phase line with described 3rd current monitor CTc; Three described current monitors and four described logic relays constitute detection control loop, and four described logic relays and four described contactors constitute and compensate major loop and loop control logic;
In described detection control loop, one end of described first current monitor CTa connects one end of described first logic relay coil 1LJ, the other end of described first logic relay coil 1LJ connects one end of described 4th logic relay coil 0LJ, and the other end of described 4th logic relay coil 0LJ connects the other end of described first current monitor CTa; One end of described second current monitor CTb connects one end of described second logic relay coil 2LJ, the other end of described second logic relay coil 2LJ connects one end of described 4th logic relay coil 0LJ, and the other end of described 4th logic relay coil 0LJ connects the other end of described second current monitor CTb; One end of described 3rd current monitor CTc connects one end of described 3rd logic relay coil 3LJ, the other end of described 3rd logic relay coil 3LJ connects one end of described 4th logic relay coil 0LJ, and the other end of described 4th logic relay coil 0LJ connects the other end of described 3rd current monitor CTc;
Described compensation major loop comprises first, second, and third normally opened contact of described first contactor, first, second, and third normally opened contact of described second contactor, first, second, and third normally opened contact of described 3rd contactor and first, second, and third normally opened contact of described 4th contactor, one end of first, second, and third normally opened contact of described first contactor connects single-phase compensation load respectively, and the other end of first, second, and third normally opened contact of described first contactor all connects the A phase of three phase line; One end of first, second, and third normally opened contact of described second contactor connects single-phase compensation load respectively, and the other end of first, second, and third normally opened contact of described second contactor all connects the B phase of three phase line; One end of first, second, and third normally opened contact of described 3rd contactor connects single-phase compensation load respectively, and the other end of first, second, and third normally opened contact of described 3rd contactor all connects the C phase of three phase line; One end of first, second, and third normally opened contact of described 4th contactor connects single-phase compensation load respectively, and the other end of first, second, and third normally opened contact of described 4th contactor connects A, B, C phase of three phase line respectively;
Described loop control logic comprises balance controlling brancher, A phase control branch road, B phase control branch road and C phase control branch road, described balance controlling brancher is by the first normally-closed contact 1LJ-11 of described first logic relay be connected on successively on same circuit, first normally-closed contact 2LJ-11 of described second logic relay, first normally-closed contact 3LJ-11 of described 3rd logic relay, first normally-closed contact 1C-11 of described first contactor, first normally-closed contact 2C-11 of described second contactor, first normally-closed contact 3C-11 and the described 4th contactor coil C of described 3rd contactor form, one end of described balance controlling brancher connects the B phase of three phase line, the other end of described balance controlling brancher connects the A phase of three phase line,
Described A phase control branch road comprises the first normally opened contact 1LJ-21 of described first logic relay, first normally opened contact 0LJ-21 of described 4th logic relay, 4th normally opened contact 1C-24 of described first contactor, second normally-closed contact 2C-12 of described second contactor, second normally-closed contact 3C-12 of described 3rd contactor and described first contactor coil 1C, wherein, one end of first normally opened contact 1LJ-21 of described first logic relay connects the B phase of three phase line by the first normally-closed contact C-11 of described 4th contactor as one end of described A phase control branch road, the other end of the first normally opened contact 1LJ-21 of described first logic relay connects one end of the first normally opened contact 0LJ-21 of described 4th logic relay, the other end of the first normally opened contact 0LJ-21 of described 4th logic relay connects one end of described first contactor coil 1C, one end of 4th normally opened contact 1C-24 of described first contactor connects one end of the first normally opened contact 1LJ-21 of described first logic relay, the other end of the 4th normally opened contact 1C-24 of described first contactor connects one end of the second normally-closed contact 2C-12 of described second contactor, the other end of the second normally-closed contact 2C-12 of described second contactor connects one end of the second normally-closed contact 3C-12 of described 3rd contactor, the other end of the second normally-closed contact 3C-12 of described 3rd contactor connects the other end of the first normally opened contact 0LJ-21 of described 4th logic relay, the other end of described first contactor coil 1C connects the A phase of three phase line as the other end of described A phase control branch road,
Described B phase control branch road comprises the first normally opened contact 2LJ-21 of described second logic relay, second normally opened contact 0LJ-22 of described 4th logic relay, 4th normally opened contact 2C-24 of described second contactor, second normally-closed contact 1C-12 of described first contactor, 3rd normally-closed contact 3C-13 of described 3rd contactor and described second contactor coil 2C, wherein, one end of first normally opened contact 2LJ-21 of described second logic relay connects the B phase of three phase line by the first normally-closed contact C-11 of described 4th contactor as one end of described B phase control branch road, the other end of the first normally opened contact 2LJ-21 of described second logic relay connects one end of the second normally opened contact 0LJ-22 of described 4th logic relay, the other end of the second normally opened contact 0LJ-22 of described 4th logic relay connects one end of described second contactor coil 2C, one end of 4th normally opened contact 2C-24 of described second contactor connects one end of the first normally opened contact 2LJ-21 of described second logic relay, the other end of the 4th normally opened contact 2C-24 of described second contactor connects one end of the second normally-closed contact 1C-12 of described first contactor, the other end of the second normally-closed contact 1C-12 of described first contactor connects one end of the 3rd normally-closed contact 3C-13 of described 3rd contactor, the other end of the 3rd normally-closed contact 3C-13 of described 3rd contactor connects the other end of the second normally opened contact 0LJ-22 of described 4th logic relay, the other end of described first contactor coil 2C connects the A phase of three phase line as the other end of described B phase control branch road,
Described C phase control branch road comprises the first normally opened contact 3LJ-21 of described 3rd logic relay, 3rd normally opened contact 0LJ-23 of described 4th logic relay, 4th normally opened contact 3C-24 of described 3rd contactor, 3rd normally-closed contact 1C-13 of described first contactor, 3rd normally-closed contact 2C-13 of described second contactor and described 3rd contactor coil 3C, wherein, one end of first normally opened contact 3LJ-21 of described 3rd logic relay connects the B phase of three phase line by the first normally-closed contact C-11 of described 4th contactor as one end of described C phase control branch road, the other end of the first normally opened contact 3LJ-21 of described 3rd logic relay connects one end of the 3rd normally opened contact 0LJ-23 of described 4th logic relay, the other end of the 3rd normally opened contact 0LJ-23 of described 4th logic relay connects one end of described 3rd contactor coil 3C, one end of 4th normally opened contact 3C-24 of described 3rd contactor connects one end of the first normally opened contact 3LJ-21 of described 3rd logic relay, the other end of the 4th normally opened contact 3C-24 of described 3rd contactor connects one end of the 3rd normally-closed contact 1C-13 of described first contactor, the other end of the 3rd normally-closed contact 1C-13 of described first contactor connects one end of the 3rd normally-closed contact 2C-13 of described second contactor, the other end of the 3rd normally-closed contact 2C-13 of described second contactor connects the other end of the 3rd normally opened contact 0LJ-23 of described 4th logic relay, the other end of described 3rd contactor coil 3C connects the A phase of three phase line as the other end of described C phase control branch road.
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| CN102904270A (en) * | 2012-11-05 | 2013-01-30 | 镇江长河电力技术有限公司 | Three-phase current unbalance adjusting system for power distribution network |
| CN103259276B (en) * | 2013-06-04 | 2016-03-30 | 长沙高升电子电器科技有限公司 | Automated intelligent distribution system and distribution method |
| CN104065090B (en) * | 2014-07-01 | 2017-10-27 | 北京德威特继保自动化科技股份有限公司 | Reactive-load compensation method and device |
| CN105449700B (en) * | 2015-12-30 | 2018-05-25 | 北京四方继保自动化股份有限公司 | The active out-of-balance load balance control system of island network generator three-phase and control method |
| CN109188278B (en) * | 2018-09-27 | 2021-02-26 | 中车大连机车车辆有限公司 | Three-phase unbalance detection circuit and system |
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