CN103795076A

CN103795076A - Three-phase load automatic balancer and phase changing device thereof

Info

Publication number: CN103795076A
Application number: CN201410078122.2A
Authority: CN
Inventors: 贾继莹
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-03-05
Filing date: 2014-03-05
Publication date: 2014-05-14

Abstract

The invention provides a three-phase load automatic balancer and a phase changing device of the three-phase load automatic balancer. The three-phase load automatic balancer and the phase changing device of the three-phase load automatic balancer aim to solve the technical problems that a breaker and the like for phase changing are arranged for single-phase loads due to three-phase unbalance hazards, but it cannot be guaranteed that power is supplied for a user continuously and reliably in the adjusting process. The phase changing device is characterized in that the phase changing device is formed by connecting three phase changing circuits in parallel, and according to each phase changing circuit, a pair of thyristors is connected in antiparallel and then connected with a magnetic latching relay in parallel. Each phase changing circuit is connected on one phase line of a three-phase power supply circuit. A control module controls the phase changing device, and the control module and the phase changing device form the three-phase load automatic balancer. The three-phase load automatic balancer and the phase changing device have the advantages that phase changing measures are simple and reliable, cost is low, and a power failure does not occur in the phase changing process.

Description

Three-phase load autobalance and commutation device thereof

Technical field

The present invention relates to the problem of low-voltage network user side three-phase imbalance, specifically low-voltage network user side three-phase load autobalance and commutation device thereof.

Background technology

In low-voltage network, three-phase load and single-phase load coexist, and single-phase load become the main aspect of electric load, because a large amount of single-phase loads have randomness and uncertainty, cause the unbalanced phenomenon ubiquity of low-voltage network three-phase load.Three-phase imbalance causes the electric energy loss of transformer and circuit and power consumption equipment to increase, and serious imbalance can threaten Electrical Safety.

For three-phase imbalance harm, more existing solutions at present.For example to single-phase load, circuit breaker that commutation uses etc. is set, but can not guarantees in adjustment process that user continues power supply reliably, and single-phase load amount multiaspect is wide, just require the bascule must be with low cost, be just of practical significance.Current computer and mechanics of communication make us can easily grasp the situation of each load, but the control of three-phase imbalance is not also accomplished automatically to adjust in real time, crucial be just not to be applicable to extensively civilian, do not affect normal power supply, load equalizer reliably.

Summary of the invention

For solving the problems of the technologies described above, the object of this invention is to provide a kind of low-voltage network user side three-phase load autobalance and commutation device thereof, it can realize the commutation automatically of not power-off ground under the control of control module (Single Chip Microcomputer (SCM) system).

Commutation device is: it is to be composed in parallel by three commutation circuits, and each commutation circuit is after a pair of controllable silicon inverse parallel, in parallel with magnetic latching relay.Each commutation circuit is connected in the corresponding phase line of three phase supply circuit.Control module control commutation device, the two forms three-phase load autobalance.

Commutation process is:

1, when the magnetic latching relay of C phase is during in on-state, user is powered mutually by C.

2, in the time that three-phase line occurs that imbalance need to be adjusted into A and power mutually, control module triggers two antiparallel controllable silicons of C phase successively, and disconnects the magnetic latching relay of C phase, and at this moment C phase current continues as customer power supply through two antiparallel controllable silicons of C phase.

3, the voltage that control module detects through transducer or current waveform, stop triggering two antiparallel controllable silicons of C phase, trigger two antiparallel controllable silicons of A phase, make two antiparallel controllable silicons of C phase bear reverse anode voltage, thereby two antiparallel controllable silicons of C phase are forced shutdown, flow through two antiparallel controllable silicons of A phase of electric current.

4, the magnetic latching relay closure of control module control A phase, electric current is through the magnetic latching relay of A phase, and two antiparallel controllable silicons of A phase are by short circuit and force the pass break, and whole adjustment process finishes.

Compared with prior art, good effect of the present invention is: commutation measure is succinct, reliable, and with low cost; Not power-off in the time of commutation.

Accompanying drawing explanation

Further illustrate the present invention below in conjunction with accompanying drawing.

Fig. 1 is electrical schematic diagram of the present invention.

Fig. 2 is the electrical schematic diagram of control module.

Embodiment

Referring to Fig. 1, commutation device is to be composed in parallel by A phase, B phase, three commutation circuits of C phase, each commutation circuit as A phase commutation circuit be a pair of controllable silicon KB11, KB12 inverse parallel after, in parallel with magnetic latching relay K1, B phase commutation circuit is after a pair of controllable silicon KB21, KB22 inverse parallel, in parallel with magnetic latching relay K2, C phase commutation circuit is after a pair of controllable silicon KB31, KB32 inverse parallel, in parallel with magnetic latching relay K3.Each commutation circuit is connected in the corresponding phase line of three phase supply circuit.

Referring to Fig. 2, control module control commutation device, said control refers to that controllable silicon and the magnetic latching relay on commutation device triggered by control module (output), the input of control module is received in all the other contacts of the output of curtage transducer and magnetic latching relay, and control module and commutation device form three-phase load autobalance.The controlled module management and control of work schedule of commutation device, control module is passed through curtage transducer as current transformer or voltage transformer etc., detect this user's electric current and phase place, and can with periphery user's control and communication module swap data, judge whether to need commutation according to neighbouring and integral load balance, as need commutation, and send instruction according to the program presetting, drive deciliter state of each switch (controllable silicon).

Referring to Fig. 1, in the time that transducer adopts current transformer, each phase line is passed a current transformer as A phase line is passed current transformer L1, B phase line is passed current transformer L3 through current transformer L2, C phase line, these three current transformer stars connect, and another end (output) of three current transformers is received the input of control module.

Commutation process is:

1, when the magnetic latching relay K3 of C phase is during in on-state, user is powered mutually by C.

2, in the time that three-phase line occurs that imbalance need to be adjusted into A and power mutually, control module triggers two antiparallel controllable silicon KP31, KP32 of C phase successively, and disconnect the magnetic latching relay K3 of C phase, at this moment C phase current continues as customer power supply through two antiparallel controllable silicon KP31, KP32 of C phase.

3, control module detects current waveform according to current transformer, stop triggering two antiparallel controllable silicon KP31, KP32 of C phase, trigger two antiparallel controllable silicon KP11, KP12 of A phase, make two antiparallel controllable silicons of C phase hold KP31, KP32 and be subject to reverse anode voltage, thereby two antiparallel controllable silicon KP31, KP32 making C phase are forced shutdown, electric current flow through two antiparallel controllable silicon KP11, KP12 of A phase.

4, the closed K1 of magnetic latching relay of control module control A phase, electric current is through the magnetic latching relay of A phase, and two antiparallel controllable silicon KP11, KP12 of A phase are because no longer triggering and being turn-offed by short circuit, and whole adjustment process finishes.

Claims

1. a commutation device for three-phase load autobalance, is characterized in that: it is to be composed in parallel by three commutation circuits, and each commutation circuit is after a pair of controllable silicon inverse parallel, in parallel with magnetic latching relay.

2. a three-phase load autobalance, is characterized in that: it is made up of control module and commutation device; Said commutation device is, it is to be composed in parallel by three commutation circuits, and each commutation circuit is after a pair of Group of Silicon Controlled Rectifier inverse parallel, in parallel with magnetic latching relay, and each commutation circuit is connected in the corresponding phase line of three phase supply circuit; Commutation device is by control module control, and said control refers to that controllable silicon and the magnetic latching relay on commutation device triggered by control module, and the input of control module is received in all the other contacts of the output of curtage transducer and magnetic latching relay.

3. according to three-phase load autobalance claimed in claim 2, it is characterized in that: said curtage transducer is current transformer, each phase line is through a current transformer, and three current transformer stars connect, and another of three current transformers terminates to the input of control module.