CN104092229B - Distributed district's branch road three-phase load current balance type monitoring method and supervising device - Google Patents

Abstract

A kind of distributed district's branch road three-phase load current balance type monitoring method and supervising device, belong to for power distribution equipment field.It arranges at least one three-phase load current balance type main controller, gather the load current signal of each bar phase line in each loop, according to acquired each bar phase line load current signal, calculate three-phase current unbalance rate or the meansigma methods of three-phase current unbalance rate in each loop, it is judged that the uneven situation of each loop three-phase load electric current；Gather in each loop the size of load current in unit table case, determine the phase place of cell list case load to be adjusted；Situation according to certain loop three-phase load current imbalance, issue control instruction to the automatic phase-change switch in corresponding cell list case in this Zhi Huilu, carry out the conversion of load phase place, realize the adjustment of each loop three-phase load current balance type of distribution transformer low-pressure side, to ensure the real balance of distribution transformer low voltage side master loop three-phase load electric current.

Description

Distributed district's branch road three-phase load current balance type monitoring method and supervising device

Technical field

The invention belongs to power supply or power distribution equipment field, particularly relate to one and the alternate load balancing of three-phase power line can be made to distribute Or reduce asymmetric method and device thereof.

Background technology

Present power system (or referred to as electric power system, lower with), especially low voltage electric network, commonly used three-phase four-wire system Power supply, owing to most of power load (such as the household electrical appliance such as air-conditioning, electric refrigerator or lighting etc.) of resident is Single-phase load, and the power consumption of each resident, electricity consumption time etc. all differ, result in low voltage electric network three-phase load electricity Flow unbalanced phenomenon to be on the rise, and have a strong impact on operation safety and the power supply quality of supply network.

As an overall electric power system, in three-phase four-wire power supply circuit, the sharing of load equilibrium between each phase line is ten Point being necessary, this is not only related to the phase line current equalization problem of three-phase power line, also relate to reduce line loss, All many problems such as the economical operation of electrical network and safety.Due to the imbalance of distribution transformer three-phase load electric current, a certain Phase load is bigger than normal, and the line loss of this phase supply line can be made to increase；Meanwhile, this phase line works under heavy load, both can Affect the operation safety of transformator, reduce again the power supply capacity of transformator；Additionally, the three-phase load electric current of transformator is uneven Weighing apparatus degree is the biggest, and the neutral current of system is the biggest, if low voltage electric network is chronically at unbalanced state, can burn time serious The disconnected neutral conductor, affects the use safety of low voltage electric network.

So, the equilibrium assignment of phase specific electric load in three-phase power line, economy, the safe operation to whole power distribution network, and Ensure the reliability of controller switching equipment, be all the most crucial.

Authorized announcement date is December in 2012 26, and Authorization Notice No. is that the Chinese utility model of CN202633960U is special Profit discloses one " low-voltage three-phase load current imbalance automatic adjustment system ", whole including monitoring system platform and monitoring End, described monitor terminal is connected with monitoring system platform by communication network, it is characterized in that, also include residual current circuit breaker Switching with automatic reverse, described residual current circuit breaker is connected with monitor terminal by 485 communication modes, described automatic reverse Switch is connected with monitor terminal by wireless power carrier communication mode.This technical scheme is by monitoring distribution transformer low-pressure side Phase line current on each branch road, is uploaded to the computer platform of electric company by monitor terminal by GPRS communication network, by Computer platform calculates the meansigma methods of each branch current unbalance factor, and according to the uneven situation of branch road load, computer platform leads to Cross monitor terminal by communication modes such as wireless or carrier waves, then under issue a command to the automatic phase-change switch in unit table case, come Realize the automatic adjustment of branch road load three-phase equilibrium.

This technical scheme is disadvantageous in that: first, and this technical scheme must pass through Three-Part protocol service provider (GPRS Communication network) complete the transmission of whole information and control process, extra communication fee can be produced, add power supply virtually Cost and running cost；Additionally because relating to the public network (letter that the third party's Virtual network operator beyond electric company provides Claim public network) access power administration private local area network (abbreviation Intranet), there is the danger of poisoning intrusion, will certainly have influence on The network security of the whole LAN system of Utilities Electric Co..

Authorized announcement date is 2012-12-26, and Authorization Notice No. is that the Chinese utility model patent of CN 202634084U discloses A kind of " low voltage electric load smart allocation terminal ", its described terminal is by great current mutual inductor, voltage transformer, big merit Rate magnetic latching relay, big electric current composite switch circuit, threephase switch interlock circuit, communication module, phase identification of circuit, CPU forms.The Secondary Winding of great current mutual inductor and voltage transformer connects threephase switch interlock circuit；Threephase switch interlocking electricity Road connects power magnetic force keeping relay and combination switch；Electric load distribution main frame CPU respectively with communication module, phase place Discriminator circuit, three-phase interlock switch are connected.It is by gathering the phase line current value on distribution transformer low voltage side master loop, warp Cross the electric load of communication module and electric company to distribute main frame and be connected, the information such as the power information of terminal are sent to power load Lotus distribution main frame, and calculated the flat of distribution transformer major loop three-phase current unbalance rate by the CPU of electric load distribution main frame Average, according to the uneven situation of transformator major loop load, by electric load distribution main frame by communications such as wireless or carrier wave The automatic phase-change switch in each tributary unit table case is issued a command under mode, carry out load automatically quickly distributing switching, A part of load is moved to another phase from a phase, to keep three-phase load current balance, realizes transformator major loop three-phase and bear The automatic adjustment of charged current.

This technical scheme is disadvantageous in that: the three-phase current of the electric load distribution main frame collection of its electric company is distribution The main circuit current of transformator, adjustment to as if the balance of transformator major loop three-phase load electric current.And actually transformator Major loop three-phase load current balance type, is not equal to the three-phase load current balance type on branch road of powering, due to three on power supply branch road Phase load current imbalance, " line loss " of supply line can drop in the same old way；And in actual moving process, it is possible to this Carry out certain the power supply branch road already at three-phase load current balance type state, because the three-phase load electric current of regulation major loop is put down Weighing apparatus, that is adjusted on the contrary is load unbalanced, increases " line loss " of supply line on the contrary.

Visible, when the three-phase current unbalance of transformator or main circuit power supply, or, the three-phase on certain power supply branch road During load current imbalance, it should how " to detect the imbalance of three-phase current "？" three-phase electricity of where should be detected actually The imbalance of stream "？" the three-phase load electric current of where should be regulated, could really realize distribution transformer low-pressure side master, prop up The balance of three-phase load electric current on loop "？It is that actual electric network is run and manages the pass still not having (very well) to solve in work Key technology problem, it hinders supply line's safe operation and really effectively carries out with what reduction " line loss " worked, have impact on confession Electricity quality.

Summary of the invention

The technical problem to be solved is to provide a kind of distributed district's branch road three-phase load current balance type monitoring method And supervising device, it is by the supervising device, first class of protection device or two grades that are arranged on distribution transformer low-pressure side main line CPU control unit in protection device, gathers and detects bearing on each bar phase line in each loop, distribution transformer platform area Charged current, it is judged that the situation of each loop three-phase load current imbalance；By gather in each loop unit table case or The load current size of (or at user) in joint household table case, determines cell list case to be adjusted or joint household table case (or user Place) phase place of load；By controlling the automatic of (or at user) in corresponding cell list case in each loop or joint household table case Phase-change switch, carries out the conversion of load phase place；It is by three-phase in each loop in control or regulation distribution transformer platform area Whole balances of load current, ensure and realize the three-phase load current balance type of distribution transformer major loop, in real meaning On achieve distribution transformer low-pressure side master, the balance of Zhi Huilu upper three-phase load electric current, line loss can be reduced to greatest extent, Improve the quality of voltage of each loop phase line end, effectively reduce power supply cost and running cost, improve the fortune of distribution transformer Row safety, effectively extends its service life, to guarantee the safe and stable operation of power network line.

A kind of distributed district's branch road three-phase load current balance type monitoring method of offer, its feature are provided It is: at least one three-phase load current balance type main controller is set；Described three-phase load current balance type main controller, gathers each The load current signal of each bar phase line in individual Zhi Huilu；Load electricity according to bar phase line each in each acquired loop Stream signal, described three-phase load current balance type main controller calculates three-phase current unbalance rate or the three-phase electricity in each loop The meansigma methods of stream unbalance factor, to judge the situation of each loop three-phase load current imbalance；Described three-phase load electric current Balance main controller, gathers unit table case in each loop or the load current size in joint household table case, according to each loop The situation of three-phase load current imbalance, determines cell list case to be adjusted or the phase place of joint household table case load.

After the three-phase current unbalance rate of a certain Zhi Huilu is more than its pre-set value, or, when a certain Zhi Huilu three-phase current The meansigma methods of unbalance factor is more than after its pre-set value, and described three-phase load current balance type main controller, according to this Zhi Huilu tri- The situation of phase load current imbalance, issues control instruction to corresponding in this Zhi Huilu by wirelessly or non-wirelessly communication modes Automatic phase-change switch in cell list case or joint household table case, carries out the conversion of load phase place, realizes distribution transformer low-pressure side The adjustment of each loop three-phase load current balance type, thus realize distribution transformer low voltage side master loop three-phase load current balance type Adjustment, reduce line loss to greatest extent, improve the quality of voltage of each loop phase line end of distribution transformer low-pressure side, have Effect reduces power supply cost and running cost.

Further, described three-phase load current balance type main controller, by control/regulation distribution transformer platform area each In loop, whole balances of three-phase load electric current, ensure/realize the three-phase load electric current of distribution transformer low voltage side master loop Balance, and then realize the real balance of distribution transformer low voltage side master loop, Zhi Huilu upper three-phase load electric current, improve distribution The safety in operation of transformator, effectively extends its service life, it is ensured that the safe and stable operation of power network line.

Concrete, its described three-phase load current balance type main controller, it is arranged on distribution transformer low-voltage side outlet end major loop On supervising device at；Or, it is arranged at the first class of protection device on each loop of distribution transformer low-voltage side outlet end； Its described three-phase load current balance type main controller, from being arranged on each loop of this step down side on each bar phase line Phase line current transformer at, or, at the first class of protection device being arranged on each loop, or, from being arranged on In three-phase electronic kilowatt-hour meter on each loop, gather/obtain the load current signal of each loop each bar phase line.

Further, the supervising device on its described major loop is electronic monitor；Its described first class of protection device, for electricity Minor residual current circuit breaker or electronic breaker；Supervising device on its described major loop or first class of protection device, with It is arranged on corresponding units table case in each loop or the automatic phase-change switch in joint household table case, constitutes three-phrase burden balance and adjust System.

Or, its described three-phase load current balance type main controller, it is arranged on each loop of distribution transformer low-pressure side subordinate Again on duplexure at the secondary protection device of unit table case or joint household table case；Its described three-phase load current balance type master Control device, at described secondary protection device, gathers/obtains the load current signal of this duplexure each bar phase line again, with And this load current signal of automatic phase-change switch subordinate user on each bar phase line in duplexure again.

Further, its described three-phase load current balance type main controller, for secondary electrons formula residual current circuit breaker or electronics Formula chopper；Its described secondary electrons formula residual current circuit breaker or electronic breaker, and be arranged on its duplexure again In automatic phase-change switch in corresponding phase line, constitute three-phrase burden balance and adjust system；

Or, be arranged on described in the secondary electrons formula residual current circuit breaker on duplexure or electronic breaker again, and set Put the automatic phase-change switch in each phase line in its again duplexure, constitute three-phrase burden balance and adjust system.

Present invention also offers a kind of distributed district's branch road three-phase load current balance type supervising device, including CPU control unit And communication unit, it is characterised in that: described CPU control unit and communication unit, it is arranged on distribution transformer low-pressure side and goes out In supervising device on line end major loop；Or, the one-level being arranged on each loop leading-out terminal of distribution transformer low-pressure side is protected In protection unit；Or, the cell list case of the duplexure again being arranged in each loop of distribution transformer low-pressure side or joint household In secondary protection device in table case；In the I/O port of described CPU control unit and distribution transformer platform area, each returns Phase line current detector unit in road is connected respectively；The I/O port of described CPU control unit is through described communication In unit, with distribution transformer platform area, the control end of each loop upper level protection device is connected respectively.

Described CPU control unit gathers/detects the load current of each bar phase line in each loop, distribution transformer platform area And load current size at phase-change switch automatically in cell list case or joint household table case in each loop, according to being gathered/detecting To each loop in the load current of each phase line, calculate three-phase current unbalance rate or the three-phase electricity in each loop The meansigma methods of stream unbalance factor, to judge the situation of each loop three-phase load current imbalance.

After the meansigma methods of described three-phase current unbalance rate or three-phase current unbalance rate is more than the pre-set value of its correspondence, Described CPU control unit is according to the situation of each loop three-phase load current imbalance, each according to gathered/detect Automatically load current size at phase-change switch in cell list case or joint household table case in Zhi Huilu, by described communication unit control Make corresponding cell list case on each loop, described distribution transformer platform area or the automatic phase-change switch action in joint household table case, Carry out the conversion of load phase place.

Or, described CPU control unit is according to the user on bar phase line each in the duplexure again gathering/detecting certainly The size of load current at dynamic phase-change switch, by described communication unit control described in again in duplexure on corresponding phase line Automatic phase-change switch action at user, carries out the conversion of load phase place.

Described CPU control unit, by the conversion of described load phase place, realizes each loop of distribution transformer low-pressure side The adjustment of three-phase load current balance type, thus realize the adjustment of distribution transformer low voltage side master loop three-phase load current balance type, Reduce line loss to greatest extent, improve the quality of voltage of each loop phase line end, effectively reduce power supply cost and running cost.

Concrete, its described communication unit is radio communication unit, power carrier communication unit or RS-485 serial communication Unit；Described phase line current detector unit is the phase line current mutual inductance being arranged in distribution transformer platform area on each loop Device, the electronic type residual current circuit breaker being arranged on each loop, electronic breaker or three-phase/electronic single-phase electric degree Table.

Concrete, the supervising device on its described major loop is arranged on the major loop of distribution transformer low-voltage side outlet end； Described first class of protection device is arranged on each loop of distribution transformer low-voltage side outlet end；Described second class protection dress Put and be arranged at cell list case or the joint household table case of duplexure again on each loop.

Supervising device, first class of protection device or secondary protection device on its described major loop, breaks for electronic type residual current Road device, or, for electronic breaker.

Concrete, its described CPU control unit and the phase line on each bar phase line in each loop, distribution transformer platform area Current transformer is connected respectively；Or, described CPU control unit is through RS-485 serial communication unit and installation Electronic type residual current circuit breaker, electronic breaker or three-phase/electronic single-phase kilowatt-hour meter on each loop are the most right Should connect.

Its described CPU control unit, by being arranged on the phase line current transformer on each bar phase line, or, by peace Electronic type residual current circuit breaker, electronic breaker or the three-phase/electronic single-phase kilowatt-hour meter being contained on each loop, adopts In collection/detection each loop, distribution transformer platform area, the load current of each bar phase line, calculates the three-phase electricity in each loop Stream unbalance factor or the meansigma methods of three-phase current unbalance rate, according to bar phase line each in each loop being gathered/detecting Load current size, it is judged that the situation of each loop three-phase load current imbalance；According to gathered/detected each In loop, the size of load current at phase-change switch in cell list case or joint household table case, determines cell list case to be adjusted or connection The phase place of family table case load；Or, according to negative at automatic phase-change switch at user on bar phase line each in described duplexure again The size of charged current, determines the phase place of customer charge at corresponding phase-change switch automatically to be adjusted.

Described three-phase load current balance type main controller, according to the situation of this Zhi Huilu three-phase load current imbalance, by nothing Line or wire communication mode issue control instruction to certainly moving in corresponding cell list case in this Zhi Huilu or joint household table case Switch mutually, carry out the conversion of load phase place, realize the tune of each loop three-phase load current balance type of distribution transformer low-pressure side Whole.

Or, described three-phase load current balance type main controller, issue control instruction to institute by wirelessly or non-wirelessly communication modes State the automatic phase-change switch at user on corresponding phase line, carry out the conversion of load phase place, realize distribution transformer low pressure The adjustment of Ge Zhi loop, side three-phase load current balance type.

Described three-phase load current balance type main controller, by three in each loop in control/regulation distribution transformer platform area Phase load current balance type, thus realize the adjustment of distribution transformer low voltage side master loop three-phase load current balance type, to greatest extent Ground reduces line loss, improves the quality of voltage of each loop phase line end of distribution transformer low-pressure side, improves the fortune of distribution transformer Row safety, effectively extends its service life, effectively reduces power supply cost and running cost, it is ensured that power network line safe, Stable operation.

Compared with the prior art, the invention have the advantage that

1. by being arranged in the supervising device of distribution transformer low voltage side master loop, first class of protection device or secondary protection device CPU control unit, gather and detect the load current on each bar phase line in each loop, distribution transformer platform area, just Ground judges the situation of each loop three-phase load current imbalance；By gathering each unit table case or joint household table case in each loop In the load current size of (or at user), determine cell list case to be adjusted or joint household table case (or at user) on the spot The phase place of load；By controlling in each loop (or each duplexure the most again) in corresponding cell list case or joint household table case (or At user) automatic phase-change switch, carry out the conversion of load phase place；It is by each in controlling or regulating distribution transformer platform area In individual Zhi Huilu (or at user), whole balances of three-phase load electric current, ensure and realize the three of distribution transformer major loop Phase load current balance type, is truly achieving the flat of three-phase load electric current on distribution transformer low-pressure side master, Zhi Huilu Weighing apparatus, can reduce line loss to greatest extent, improve the quality of voltage of each loop phase line end, effectively reduces power supply cost and fortune Working cost, improves the safety in operation of distribution transformer, effectively extends its service life, with guarantee power network line safe, Stable operation；

2. CPU control unit described in and communication unit are arranged on the monitoring dress of distribution transformer low-voltage side outlet end major loop In putting, or, it is arranged in the first class of protection device on each loop of distribution transformer low-voltage side outlet end, or, if Put in the unit table case on each loop or the secondary protection device at joint household table case；Each bar in each loop Phase line current transformer that the collection point of phase line load current is arranged on each loop, it is arranged on each loop Electronic type residual current circuit breaker.On electronic circuit breaker or three-phase/electronic single-phase kilowatt-hour meter, can maximally utilise existing Device and detection resource, be reduced as far as disposably putting into, and reduces circuit, the improvement expenses of equipment, and then reduces power supply The operation cost of system and maintenance cost；

3., between three-phase load current balance type main controller and each automatic phase-change switch, use near radio network or wired Network is directly controlled the transmission of signal, and its three-phase load current balance type main controller is done directly data sampling and processing and control Function processed, eliminate GPRS communication network and computer platform, it is to avoid aforesaid prior art needs by third party's network The problem carried out data transmission, thus solve " third party's Virtual network operator provide public network access power administration special , there is the danger of poisoning intrusion in LAN " problem, it is ensured that Utilities Electric Co.'s whole power supply LAN system network peace Entirely；

4. by whole balances of three-phase load electric current in each loop in control/regulation distribution transformer platform area, ensure/ Realize the three-phase load current balance type of distribution transformer low voltage side master loop, really realize distribution transformer low voltage side master loop, The balance of Zhi Huilu upper three-phase load electric current, thus reach to reduce to greatest extent line loss, improve each loop phase line end Voltage, improves distribution transformer safety in operation simultaneously, extends service life and the invention of the safe and stable operation of power network line Purpose.

Accompanying drawing explanation

Fig. 1 is the method step block diagram of the present invention；

Fig. 2 is that three-phase load current balance type main controller of the present invention obtains the signal of each bar phase line load current on each loop Figure；

Fig. 3 is the schematic diagram that a kind of system of supervising device of the present invention is constituted；

Fig. 4 is the schematic diagram that supervising device another kind system of the present invention is constituted；

Fig. 5 is the schematic diagram that another system of supervising device of the present invention is constituted.

In figure, 1 is three-phase load current balance type main controller, and 2 is wirelessly or electrically power carrier communication unit, and 3 for being arranged on each Phase line current transformer on loop, 4,4-1～4-n ' be the first class of protection device being arranged on each loop, 5-1～5-n is Being arranged on the secondary protection device on each loop, 6-1～6-N, 6-1n～6-Nn is in each bar cell list case or joint household table case Automatically phase-change switch, 7 is the three-phase/electronic single-phase kilowatt-hour meter being arranged on each loop, and n, n ', n represent distribution Each power supply Zhi Huilu of transformer low voltage outgoing line side.

Detailed description of the invention

The present invention will be further described with embodiment below in conjunction with the accompanying drawings.

In Fig. 1, technical scheme provides branch road three-phase load current balance type monitoring side of a kind of distributed district Method, its use three-phase load current balance type control device gather and detection distribution transformer platform area (in electric power system, certain transformator Platform district refer to the regional extent of this transformer-supplied, referred to as transformer platform area) in each loop on each bar phase line Load current, judges the situation of each loop three-phase load current imbalance local (the most usually said " on the spot ")； By the load current size of (or at user) in each unit table case in each loop of collection or joint household table case, determine institute on the spot Cell list case to be adjusted or the phase place of joint household table case (or at user) load；Being controlled by wirelessly or non-wirelessly communication modes should Automatic phase-change switch on each bar phase line in each loop, distribution transformer platform area, carries out the conversion of load phase place, thus Realize the adjustment of three-phase load current balance type.

Concrete, the technical program arranges at least one three-phase load current balance type main controller；Described three-phase load electric current is put down Weighing apparatus main controller is arranged on the leading-out terminal (as shown in Figure 3) of distribution transformer low-pressure side, or is arranged at joint household table case (such as figure Shown in 4), or be arranged on again at duplexure cell list case (as shown in Figure 5).

Described three-phase load current balance type main controller, gathers in each loop or each bar phase line negative in each duplexure the most again Charged current signal；Described three-phase load current balance type main controller, according to each acquired loop or again in duplexure The load current signal of each bar phase line, calculate each loop (or duplexure again) three-phase current unbalance rate and The meansigma methods of three-phase current unbalance rate, it is judged that the feelings of each loop (or duplexure again) three-phase load current imbalance Condition.

Described three-phase load current balance type main controller, gathers in each loop in unit table case, or joint household table case, or The load current size of user, according to the situation of each loop three-phase load current imbalance, determines phase line to be adjusted (at phase-change switch) cell list case or the phase place of joint household table case (or user) load.

After the three-phase current unbalance rate of a certain Zhi Huilu is more than its pre-set value, or, when a certain Zhi Huilu three-phase current The meansigma methods of unbalance factor more than after its pre-set value, described three-phase load current balance type main controller, according to this Zhi Huilu (or This duplexure again) situation of three-phase load current imbalance, issue control instruction to should by wirelessly or non-wirelessly communication modes Automatic phase-change switch in cell list case corresponding in Zhi Huilu (or this again duplexure) or at user, carries out load phase The conversion of position；By controlling and three-phase load electric current in regulation each loop, distribution transformer platform area (or duplexure again) Balance, ensure and realize the three-phase load current balance type of distribution transformer low voltage side master loop, thus realize distribution transformer The real balance of the upper three-phase load electric current of device low voltage side master loop, Zhi Huilu (or duplexure again)；Reduce line to greatest extent Damage, improve the quality of voltage of each loop phase line end of distribution transformer low-pressure side, improve the safety that distribution transformer runs, Effectively extend its service life, reduce power supply cost and running cost, it is ensured that the safe and stable operation of electrical network supply line.

Further, described three-phase load current balance type main controller, by control and regulation distribution transformer platform area each In loop, whole balances of three-phase load electric current, ensure and realize the three-phase load electric current of distribution transformer low voltage side master loop Balance, and then realize the real balance of distribution transformer low voltage side master loop, Zhi Huilu upper three-phase load electric current, improve distribution The safety in operation of transformator, effectively extends its service life, it is ensured that the safe and stable operation of power network line.

Concrete, its described three-phase load current balance type main controller, it is arranged on distribution transformer low-voltage side outlet end major loop On supervising device at；Or, it is arranged at the first class of protection device on each loop of distribution transformer low-voltage side outlet end. Its described three-phase load current balance type main controller, from being arranged on each loop of this step down side on each bar phase line Phase line current transformer at, or, at the first class of protection device being arranged on each loop, or, from being arranged on In three-phase on each loop or electronic single-phase kilowatt-hour meter, gather and obtain the load electricity of each loop each bar phase line Stream signal (as shown in Figure 3 or Figure 4).

Supervising device on described major loop is electronic monitor；Its described first class of protection device, for electronic type residual current Chopper or electronic breaker；Supervising device on its described major loop or first class of protection device, and be arranged on each Automatic phase-change switch in corresponding units table case or joint household table case in loop, constitutes three-phrase burden balance and adjusts system (such as Fig. 3 Or shown in Fig. 4).

Or, its described three-phase load current balance type main controller, it is arranged on each loop of distribution transformer low-pressure side subordinate Again on duplexure at the secondary protection device of unit table case or joint household table case；Its described three-phase load current balance type master Control device, at described secondary protection device, gathers and obtains the load current signal of this duplexure each bar phase line again, And this again in duplexure the load current signal of the automatic phase-change switch subordinate user on each bar phase line (such as Fig. 5 institute Show).

Its described three-phase load current balance type main controller, for secondary electrons formula residual current circuit breaker or electronic breaker； Its described secondary electrons formula residual current circuit breaker or electronic breaker, and be arranged on its corresponding phase line in duplexure again On automatic phase-change switch, constitute three-phrase burden balance adjust system (as shown in Figure 5).

Or, be arranged on described in the secondary electrons formula residual current circuit breaker on duplexure or electronic breaker again, and set Put the automatic phase-change switch in each phase line in its again duplexure, constitute three-phrase burden balance and adjust system (as shown in Figure 5).

In specific implementation process, the pre-set value of its described three-phase current unbalance rate is determined, generally by local power supply department Can select in the range of 5%～15%.

After using the technical program, owing to its three-phase load current balance type main controller is done directly the collection of data, process on the spot With control function, eliminate GPRS communication network and computer platform, on the one hand can eliminate the communication expense in running With, greatly reduce operating cost；On the other hand, sending all at this due to all data sampling and processings and control instruction The CPU on ground is carried out, thus avoids " the public network access electric industry that third party's Virtual network operator provides in prior art Office private local area network, there is the danger of poisoning intrusion " problem.

Additionally, the maximum difference of the technical program and prior art is, it is by controlling and regulation distribution transformer platform area is each In individual Zhi Huilu, whole balances of three-phase load electric current, ensure and realize the three-phase load of distribution transformer low voltage side master loop Current balance type, and then realize the real balance of distribution transformer low voltage side master loop, Zhi Huilu upper three-phase load electric current.Specifically Ground is said, and the technical program is by gathering respectively in each loop or the load current letter of each bar phase line in each duplexure the most again Number, it is judged that the situation of three-phase load current imbalance in each loop (or duplexure again)；By gathering each loop Middle unit table case, or in joint household table case, or the load current size of user, according to each loop three-phase load electric current not The situation of balance, determines phase line (at phase-change switch) cell list case to be adjusted or joint household table case (or user) load Phase place；According to the situation of this Zhi Huilu (or this again duplexure) three-phase load current imbalance, described three-phase load Current balance type main controller, issues control instruction to this Zhi Huilu (or this again duplexure) by wirelessly or non-wirelessly communication modes In automatic phase-change switch in corresponding cell list case or at user, carry out the conversion of load phase place.

The technical program, bears by controlling and regulating three-phase in each loop, distribution transformer platform area (or duplexure again) The balance of charged current, ensures and realizes the three-phase load current balance type of distribution transformer low voltage side master loop, thus realize joining The real balance of the upper three-phase load electric current of piezoelectric transformer low voltage side master loop, Zhi Huilu (or duplexure again), thus finally Realize and ensure that the three-phase load current balance type of this distribution transformer low voltage side master loop.

In Fig. 2, described three-phase load current balance type main controller 1, from being arranged on this transformer low voltage outgoing line side, each returns In the phase line current transformer 3 on each bar phase line in road, gather and obtain each bar phase line in each loop respectively Load current signal.

Or, described three-phase load current balance type main controller, from the first class of protection device 4 being arranged on each loop, Or in three-phase/electronic single-phase kilowatt-hour meter 7, gather and obtain the load current on each bar phase line in each loop respectively Signal.

In Fig. 3, the invention provides a kind of distributed district's branch road three-phase load current balance type supervising device, its system is constituted Including CPU control unit and communication unit, the key inventive point of its technical scheme is, described CPU control unit and Communication unit, is arranged in the supervising device on distribution transformer low-voltage side outlet end major loop, constitutes three-phase load electric current and puts down Weighing apparatus main controller 1.

Supervising device 1 on its described major loop be arranged in each loop corresponding units table case or joint household table case (or use At family) automatic phase-change switch 6-1～6-N or 6-1n～6-Nn, three-phrase burden balance described in composition adjusts system.

As seen from the figure, described three-phase load current balance type main controller obtains it at the major loop of distribution transformer low-pressure line-outgoing side Control power supply needed for work.

The I/O port of the CPU control unit of described three-phase load current balance type main controller is each with described distribution transformer platform area Phase line current detector unit in individual Zhi Huilu is connected respectively.

The I/O port of described CPU control unit is through described communication unit, with each loop, distribution transformer platform area In automatic phase-change switch 6-1～6-N in cell list case on each bar phase line be connected respectively.

Its described communication unit is radio communication unit, power carrier communication unit or RS-485 serial communication unit.

Its described phase line current detector unit is that the phase line current being arranged in distribution transformer platform area on each loop is mutual Sensor, electronic type residual current circuit breaker, electronic breaker or the three-phase being arranged on each loop and electronic single-phase (in detail in this figure, described phase line current detector unit is with the one-level electronic type residual current being arranged on each loop for kilowatt-hour meter Illustrate as a example by chopper 4-1～4-n ').

Further, described CPU control unit and each phase line current mutual inductance on each loop, distribution transformer platform area Device is connected respectively；Or, described CPU control unit through RS-485 serial communication unit be arranged on Zhi Huilu On first class of protection device (the most aforesaid one-level electronic type residual current circuit breaker) or three-phase electronic kilowatt-hour meter respectively correspondence Connect and (in this figure, say as a example by the one-level electronic type residual current circuit breaker 4-1～4-n ' being arranged on each loop Bright).

Described CPU control unit, according to being gathered or detect each bar phase line in each loop, distribution transformer platform area Load current, calculates three-phase current unbalance rate or the meansigma methods of three-phase current unbalance rate in each loop；According to institute The load current size of each bar phase line in each loop gathered or detect, it is judged that each loop three-phase load electric current is not The situation of balance；CPU control unit is simultaneously always according in cell list case at the phase-change switch on bar phase line each in each loop Load current, determine the phase place of cell list case load to be adjusted.

When, after the described three-phase current unbalance rate pre-set value more than its correspondence, described CPU control unit is according to each The situation of loop three-phase load current imbalance, by described communication unit control respectively described distribution transformer platform area each Automatic phase-change switch 6-1～6-N in corresponding cell list case in Zhi Huilu (be also referred to as in the industry joint household table case, lower with) or 6-1n～6-Nn action, carries out the conversion of load phase place, realizes Ge Zhi loop, distribution transformer low-pressure line-outgoing side three-phase load The adjustment of current balance type, thus realize the balance of distribution transformer low-pressure line-outgoing side major loop three-phase load current balance type, maximum Limit ground reduces " line loss ", improves the quality of voltage of each loop phase line end, effectively reduces power supply cost and running cost.

In detail in this figure, described CPU control unit (fills with the monitoring on distribution transformer low-voltage side outlet end major loop in figure Put the three-phase load current balance type main controller 1 representing described) and each automatic phase-change switch 6-1～6-N or 6-1n～6-Nn Between, use radio communication unit or power carrier communication unit to be directly controlled the transmission of instruction.

Further, described CPU control unit gathers or detects each bar phase line in each loop, distribution transformer platform area Load current on road, calculates the meansigma methods of the three-phase current unbalance rate in each loop, this distribution transformer platform area, root According to the load current size on each bar phase line in each loop of gathering or detecting, it is judged that each loop three-phase load The situation of current imbalance, puts down by controlling or regulating the three-phase load electric current in each loop, this distribution transformer platform area Weighing apparatus, it is achieved distribution transformer low-pressure line-outgoing side major loop, the real balance of Zhi Huilu upper three-phase load electric current, ensures and real The now three-phase load current balance type of this distribution transformer low-pressure line-outgoing side major loop, and then improve the operation safety of distribution transformer Property, effectively extend its service life, it is ensured that the safe and stable operation of power network line.

After using the technical program, three-phase load current balance type main controller be done directly data acquisition, data process and phase place Adjust, control function, eliminate and the GPRS transmission of electric company's computer platform, it is to avoid aforesaid prior art The problem needing to carry out data transmission by third party's network, thus solve " the public network that third party's Virtual network operator provides Network access power administration private local area network, there is the danger of poisoning intrusion " problem, it is ensured that the whole power supply of electric company The network security of LAN system.

In the embodiment shown in this figure, the supervising device on described major loop is electronic monitor；Its described first class of protection Device is electronic type residual current circuit breaker or electronic breaker；Supervising device on its described major loop, and is arranged on Automatic phase-change switch in corresponding units table case or joint household table case in each loop, constitutes three-phrase burden balance and adjusts system.

In Fig. 4, the another kind of system giving distributed district's branch road three-phase load current balance type supervising device of the present invention is constituted, Its difference constituted with system shown in Figure 3 is, in the system structure shown in this figure, and described CPU control unit and communication list Unit, is arranged in the first class of protection device 4-1～4-n ' on each loop of distribution transformer low-voltage side outlet end, constitutes three-phase Load current balance main controller.

Described first class of protection device 4-1～4-n ', be arranged in each loop corresponding units table case or joint household table case from Dynamic phase-change switch 6-1～6-N or 6-1n～6-Nn, the three-phrase burden balance described in composition adjusts system.

Described CPU control unit is (with the first class of protection device on each loop of distribution transformer low-voltage side outlet end in figure 4-1～4-n ' represents described three-phase load current balance type main controller 1) with each automatic phase-change switch 6-1～6-N or Between 6-1n～6-Nn, radio communication unit or power carrier communication unit is used directly to be controlled the transmission of instruction.

Its described first class of protection device is electronic type residual current circuit breaker or electronic breaker, and it is by remaining in electronic type The control loop of aftercurrent chopper or electronic breaker installs additional wireless or carrier communication module and RS485 communication interface,

By the CPU in existing first class of protection device (the most aforesaid one-level electronic type residual current circuit breaker or electronic breaker) Control unit, realizes monitoring the process of data and issuing of control instruction.

So, it is contained in the one-level electronic type residual current circuit breaker on each loop of step down side or electronic circuit breaker, can Directly as three-phrase burden balance adjust main controller, with automatic phase-change switch 6-1～6-N in described phase line or 6-1n～6-Nn collectively forms three-phrase burden balance and adjusts system.

Due to existing various switch-boxes or the size of joint household table case, inner space with filled various switch, control the position of device Deng the most having detailed regulation or restriction in various GBs, code, therefore actually at existing various switch-boxes or joint household table Case install additional the various switch newly increased or controls device, being actually intended to limitation and restriction by above-mentioned various regulations. In this case, compared with the system structure shown in Fig. 3, the system structure shown in this figure, in existing switch-box or joint household In table case, it is not necessary to newly-increased extra control device, utilize original switch or control device can realize technical solution of the present invention, Reach the technique effect identical with system shown in Figure 3 composition, and there is lower improvement cost, it is easier to for each electric company Or electricity consumption user is accepted, it is more beneficial for promotion and application.

Remaining same Fig. 3.

In Fig. 5, another system giving distributed district's branch road three-phase load current balance type supervising device of the present invention is constituted, Its difference constituted with Fig. 3 or system shown in Figure 4 is, in the supply line's structure shown in this figure, at aforesaid distribution transformer In each loop of device low-pressure side (representing with Zhi Huilu 1 to Zhi Huilu N in figure), also exist not only secondary but also duplexure ( The technical program is referred to as duplexure the most again, figure represents to duplexure n again with duplexure 1 again).

For the supply line's structure shown in this figure, the CPU control unit described in the technical program and communication unit, it is arranged on The second class protection dress of unit table case or joint household table case on the subordinate's duplexure again of each loop of distribution transformer low-pressure side Put in 5-1～5-n ', the three-phase load current balance type main controller described in composition.

Its described three-phase load current balance type main controller, at described secondary protection device, gathers and obtains this branch again The load current signal of loop each bar phase line, and this (this of automatic phase-change switch on each bar phase line in duplexure again Figure represents with middle 6-1～6-N or 6-1n～6-Nn) the load current signal of subordinate user.

Described three-phase load current balance type main controller, for secondary electrons formula residual current circuit breaker or electronic breaker；Its Described secondary electrons formula residual current circuit breaker or electronic breaker, and be arranged on it again in duplexure in corresponding phase line Automatic phase-change switch 6-1～6-N or 6-1n～6-Nn, three-phrase burden balance described in composition adjusts system.

Described CPU control unit is (each to be arranged on the subordinate's duplexure again of each loop of distribution transformer low-pressure side in figure Secondary protection device 5-1～5-n ' in individual cell list case or joint household table case represents described three-phase load current balance type master control Device 1) and each automatic phase-change switch 6-1～6-N or 6-1n～6-Nn between, use radio communication unit or power carrier to lead to News unit is directly controlled the transmission of instruction.

In the system shown in this figure is constituted, by described CPU control unit and communication unit, it is arranged on distribution transformer low Cell list case in pressure each loop, side or secondary protection device (the most aforesaid secondary electrons formula residual current of joint household table case Chopper or electronic breaker) in；Further, in the subscribers' line that three-phase line is mixed with uniline, its three-phase is born The adjustment of lotus balance, can only realize by installing phase-change switch additional in the phase line of three-phase line lower end, therefore described two grades Electronic type residual current circuit breaker or electronic breaker, and the automatic phase-change switch being arranged at each relative users, with regard to structure The three-phrase burden balance in the technical program has been become to adjust system.

Remaining is with Fig. 3 or Fig. 4.

By shown in above-mentioned Fig. 3～Fig. 5 and related text describe, the innovative point of the technical program is, distribution change In supervising device on depressor low-voltage side outlet end major loop, or, in each loop of distribution transformer low-voltage side outlet end On first class of protection device in, or, in the secondary protection device in each loop of distribution transformer low-pressure side, arrange Described three-phase load current balance type main controller；The I/O port of the CPU control unit of described three-phase load current balance type main controller With in each loop in described distribution transformer platform area phase line current detector unit (the most aforesaid phase line current transformer, First class of protection device, secondary protection device or three-phase/electronic single-phase kilowatt-hour meter) it is connected respectively；Described CPU controls single The I/O port of unit cell list case on each bar phase line in described communication unit, with each loop, distribution transformer platform area Or automatic phase-change switch in joint household table case (or in each bar phase line automatic phase-change switch) at user is connected respectively, just Constitute the three-phrase burden balance described in the technical program and adjust system.Its described three-phrase burden balance adjusts system, directly Data acquisition, data process and phase place adjust, control function on the spot, and it is uneven according to each loop three-phase load electric current The situation of weighing apparatus, controls corresponding cell list in each loop, described distribution transformer platform area respectively by described communication unit Automatic phase-change switch in case or joint household table case, carries out the conversion of load phase place, realizes distribution transformer low-pressure line-outgoing side each The adjustment of Zhi Huilu three-phase load current balance type；It is by controlling and regulation each loop, distribution transformer platform area (or is divided again The balance of three-phase load electric current in Zhi Huilu), ensures and realizes the three-phase load electric current of distribution transformer low voltage side master loop Balance, thus realize the real balance of distribution transformer low voltage side master loop, Zhi Huilu upper three-phase load electric current, thus finally Realize and ensure that the three-phase load current balance type of this distribution transformer low voltage side master loop.

Above-mentioned one-level (or two grades) protection device, for one-level (or two grades) electronic type residual current circuit breaker or electronic type Chopper.

When being embodied as, aforesaid one-level or secondary electrons formula residual current circuit breaker, the applicant enterprise can be selected to produce SZM1L series three phase residual current circuit breaker；Aforesaid automatic phase-change switch, can select the applicant enterprise to produce SZ-HXK series phase-change switch.

In prior art, the most how to realize adjustment or the regulation of phase specific electric load between each phase in three-phase power line, at many Being disclosed in patent documentation and introduce, such as, applying for before this applicant, authorized announcement date is 2013 years 03 month 06 Day, Authorization Notice No. is the Chinese invention patent " a kind of method of load automatic three-phase switching " of CN101854062A, its One switching switch is set between three phase mains and single-phase load；Switching switch be three separate, with interlocking dress The single-phase switch put；Its power input is corresponding with the three of three phase mains phase lines respectively to be connected；The power supply of three single-phase switch Outfan parallel connection constitutes the power output end of switching switch；Needing to carry out regulation and the equilibrium of load between three-phase power line Time, by the size of detected Ge Xiang supply line load current, determine the road phase line that phase line electric current is minimum；Open Or disconnect in a certain phase-change switch in the road phase line that in the circuitry phase being originally in Guan Bi or on-state, electric current is maximum Single-phase switch, closes or connects the single-phase switch in this phase-change switch corresponding to the phase line minimum with phase line electric current, make to bear Lotus is transferred to this small area analysis phase line by the big electric current phase line at original place and carries out single phase power supply, it is achieved the instant circuit that automatically adjusts is born Lotus balances.

And for example, applying for before this applicant, publication date is on 06 27th, 2012, Publication No. CN102522760A Chinese invention patent application, disclose one and " three-phase line phase line changing method and the phase-change switch of phase fault can be avoided Device ", it arranges a phase line switching switch and a Self-resetting single-phase switch in the housing of phase-change switch, when needs enter During row load switching, first control Self-resetting single-phase switch and disconnect, cut off the supplying power for outside of phase-change switch device, then rotate The moving contact of electronic rotation switching switch, uses the rotation switching mode of " one-out-three " so that single phase poaer supply phase line input The phase sequence at place is switched in the phase line specified；Finally control Self-resetting single-phase switch Guan Bi, recover the right of phase-change switch device Outer power supply.Owing to which employs the rotation switching mode of " multiselect one ", and break the company of itself and load side at handoff procedure Connecing, thoroughly avoid the situation that two phase line short circuits occur when phase-change switch breaks down, whole handoff procedure is safe and reliable, Improve the safety of powered operation.

So, in present specification, for specifically how realizing each phase in three-phase power line by automatic phase-change switch Between the adjustment of phase specific electric load or regulation, describe the most in detail at this.

The key point of technical solution of the present invention is that it is clear and definite and has carried out following concept:

1, distribution transformer low-pressure side goes out the three-phase load current balance type of major loop, is not equal in each loop of this transformator Three-phase load electric current all balance；

2, distribution transformer low-pressure side goes out the three-phase load current imbalance of major loop, is not equal to each loop of this transformator In three-phase load electric current the most uneven；

3, the three-phase load electric current in each loop of distribution transformer low-pressure side all reaches balance, also ensures that this distribution The three-phase load current balance type of step down side major loop.

In the technical scheme of the application, described three-phase load current balance type main controller, according to each acquired loop In the load current signal of each bar phase line, calculate three-phase current unbalance rate or the three-phase current unbalance in each loop The meansigma methods of rate, to judge the situation of each loop three-phase load current imbalance；According to each loop three-phase load electric current not The situation of balance, determines cell list case to be adjusted or the phase place of joint household table case load；According to this Zhi Huilu three-phase load electricity Flow unbalanced situation, described three-phase load current balance type main controller, issue control by wirelessly or non-wirelessly communication modes and refer to Order, to corresponding automatic phase-change switch, carries out the conversion of load phase place, realizes each loop three of distribution transformer low-pressure side The adjustment of phase load current balance type；It is by the three-phase load electricity controlled or regulate in each loop, this distribution transformer platform area Mobile equilibrium, it is achieved distribution transformer low-pressure line-outgoing side major loop, the real balance of Zhi Huilu upper three-phase load electric current.

The method can be widely used in equilibrium assignment or the regulation control field of the alternate load of low voltage three-phase supply line.

Claims (11)

1. distributed district's branch road three-phase load current balance type monitoring method, including arranging at least one three-phase load electric current Balance main controller, gathers the load current signal in each loop；Judge the situation of each loop three-phase load current imbalance； By automatic phase-change switch, carry out the conversion of load phase place, improve the safety in operation of distribution transformer, effectively extend its fortune The row life-span, it is ensured that the safe and stable operation of power network line；It is characterized in that:

Described three-phase load current balance type main controller, gathers the load current signal of each bar phase line in each loop；

According to the load current signal of bar phase line each in each acquired loop, described three-phase load current balance type Main controller calculates three-phase current unbalance rate or the meansigma methods of three-phase current unbalance rate in each loop, to judge each The situation of loop three-phase load current imbalance；

Described three-phase load current balance type main controller, gathers each unit table case in each loop or the load in joint household table case Size of current, according to the situation of each loop three-phase load current imbalance, determines cell list case to be adjusted or joint household table The phase place of case load；

After the three-phase current unbalance rate of a certain Zhi Huilu is more than its pre-set value, or, when a certain Zhi Huilu three-phase electricity The meansigma methods of stream unbalance factor is more than after its pre-set value, and described three-phase load current balance type main controller, according to this Zhi Huilu The situation of three-phase load current imbalance, issues control instruction to corresponding in this Zhi Huilu by wirelessly or non-wirelessly communication modes Cell list case or joint household table case in automatic phase-change switch, carry out the conversion of load phase place, realize distribution transformer low pressure The adjustment of Ge Zhi loop, side three-phase load current balance type, thus realize distribution transformer low voltage side master loop three-phase load electric current and put down The adjustment of weighing apparatus, reduces line loss to greatest extent, improves the quality of voltage of each loop phase line end of distribution transformer low-pressure side, Effectively reduce power supply cost and running cost；

Described three-phase load current balance type main controller, by control/regulation each loop, distribution transformer platform area three Whole balances of phase load electric current, ensure/realize the three-phase load current balance type of distribution transformer low voltage side master loop, enter And realize the real balance of distribution transformer low voltage side master loop, Zhi Huilu upper three-phase load electric current；

Distributed described district's branch road three-phase load current balance type monitoring method, uses three-phase load current balance type control device to adopt In collection and detection each loop, distribution transformer platform area, the load current on each bar phase line, judges each loop in this locality The situation of three-phase load current imbalance；By gathering in each unit table case in each loop or joint household table case/or the bearing of user place Charged current size, determines the phase place of load at cell list case to be adjusted or joint household table case/user on the spot；By wireless or have Line communication modes controls the automatic phase-change switch in each loop, this distribution transformer platform area on each bar phase line, carries out load The conversion of phase place, thus realize the adjustment of three-phase load current balance type.

2. according to distributed district's branch road three-phase load current balance type monitoring method described in claim 1, it is characterised in that institute The three-phase load current balance type main controller stated, is arranged at the supervising device on distribution transformer low-voltage side outlet end major loop； Or, it is arranged at the first class of protection device on each loop of distribution transformer low-voltage side outlet end；

Its described three-phase load current balance type main controller, from being arranged on each bar phase line each loop of this step down side At phase line current transformer on road, or, at the first class of protection device being arranged on each loop, or, from setting Put in the three-phase electronic kilowatt-hour meter on each loop, gather/obtain the load current letter of each loop each bar phase line Number.

3. according to distributed district's branch road three-phase load current balance type monitoring method described in claim 2, it is characterised in that institute Stating the supervising device on major loop is electronic monitor；Its described first class of protection device, for electronic breaker；Described in it Major loop on supervising device or first class of protection device, and be arranged on corresponding units table case or joint household table case in each loop In automatic phase-change switch, constitute three-phrase burden balance adjust system.

4. according to distributed district's branch road three-phase load current balance type monitoring method described in claim 1, it is characterised in that institute The three-phase load current balance type main controller stated, is arranged on the subordinate's duplexure again of each loop of distribution transformer low-pressure side each At the secondary protection device of individual cell list case or joint household table case；

Its described three-phase load current balance type main controller, at described secondary protection device, gathers/obtains this branch again The load current signal of loop each bar phase line, and this automatic phase-change switch subordinate on each bar phase line in duplexure again The load current signal of user.

5. according to distributed district's branch road three-phase load current balance type monitoring method described in claim 4, it is characterised in that institute The three-phase load current balance type main controller stated, for secondary electrons formula chopper；Its described secondary electrons formula chopper, and sets Put the automatic phase-change switch in corresponding phase line in its again duplexure, constitute three-phrase burden balance and adjust system；

Or, be arranged on described in the secondary electrons formula chopper on duplexure again, and be arranged on its each phase in duplexure again Automatic phase-change switch on line, constitutes three-phrase burden balance and adjusts system.

6., according to distributed district's branch road three-phase load current balance type monitoring method described in claim 3 or 5, its feature exists It is electronic type residual current circuit breaker in described electronic breaker.

7. distributed district's branch road three-phase load current balance type supervising device, including CPU control unit and communication unit, It is characterized in that:

Described CPU control unit and communication unit, the monitoring being arranged on distribution transformer low-voltage side outlet end major loop fills In putting；Or, it is arranged in the first class of protection device of each loop leading-out terminal of distribution transformer low-pressure side；Or, arrange Second class protection dress in the cell list case of the duplexure again in each loop of distribution transformer low-pressure side or joint household table case In putting；

The I/O port of described CPU control unit is single with the phase line current detection in each loop in distribution transformer platform area Unit is connected respectively；

In described communication unit, with distribution transformer platform area, each returns the I/O port of described CPU control unit The control end of road upper level protection device is connected respectively；

Described CPU control unit gathers/detects the load current of each bar phase line in each loop, distribution transformer platform area And load current size at phase-change switch automatically in cell list case or joint household table case in each loop, according to being gathered/detecting To each loop in the load current of each phase line, calculate three-phase current unbalance rate or the three-phase electricity in each loop The meansigma methods of stream unbalance factor, to judge the situation of each loop three-phase load current imbalance；

After the meansigma methods of described three-phase current unbalance rate or three-phase current unbalance rate is more than the pre-set value of its correspondence, Described CPU control unit is according to the situation of each loop three-phase load current imbalance, each according to gathered/detect Automatically load current size at phase-change switch in cell list case or joint household table case in Zhi Huilu, by described communication unit control Make corresponding cell list case on each loop, described distribution transformer platform area or the automatic phase-change switch action in joint household table case, Carry out the conversion of load phase place；

Or, described CPU control unit is according to the user on bar phase line each in the duplexure again gathering/detecting certainly The size of load current at dynamic phase-change switch, by described communication unit control described in again in duplexure on corresponding phase line Automatic phase-change switch action at user, carries out the conversion of load phase place；

Described CPU control unit, by the conversion of described load phase place, realizes each loop of distribution transformer low-pressure side The adjustment of three-phase load current balance type, thus realize the adjustment of distribution transformer low voltage side master loop three-phase load current balance type, Reduce line loss to greatest extent, improve the quality of voltage of each loop phase line end, effectively reduce power supply cost and running cost.

8. according to the cloth platform district branch road three-phase load current balance type supervising device described in claim 7, it is characterised in that described Communication unit be radio communication unit, power carrier communication unit or RS-485 serial communication unit；

Described phase line current detector unit is that the phase line current being arranged in distribution transformer platform area on each loop is mutual Sensor, the electronic breaker being arranged on each loop or three-phase/electronic single-phase kilowatt-hour meter.

9. according to the cloth platform district branch road three-phase load current balance type supervising device described in claim 7, it is characterised in that described Major loop on supervising device be arranged on the major loop of distribution transformer low-voltage side outlet end；Described first class of protection device It is arranged on each loop of distribution transformer low-voltage side outlet end；Described secondary protection device is arranged on each loop On again at the cell list case of duplexure or joint household table case；

Supervising device, first class of protection device or secondary protection device on its described major loop, for electronic breaker.

10. according to the cloth platform district branch road three-phase load current balance type supervising device described in claim 7, it is characterised in that In described each loop of CPU control unit and distribution transformer platform area, the phase line current transformer on each bar phase line divides The most corresponding connection；Or, described CPU control unit through RS-485 serial communication unit be arranged on each loop On electronic breaker or three-phase/electronic single-phase kilowatt-hour meter be connected respectively；

Described CPU control unit, by being arranged on the phase line current transformer on each bar phase line, or, by installing Electronic breaker on each loop or three-phase/electronic single-phase kilowatt-hour meter, gather/detect distribution transformer platform area each The load current of each bar phase line in individual Zhi Huilu, calculates the three-phase current unbalance rate in each loop or three-phase current not The meansigma methods of balanced ratio, according to the load current size of bar phase line each in each loop being gathered/detecting, it is judged that each The situation of Zhi Huilu three-phase load current imbalance；According to cell list case or joint household table in each loop being gathered/detecting The size of load current at phase-change switch in case, determines cell list case to be adjusted or the phase place of joint household table case load；Or, According to the size of load current at automatic phase-change switch at user on bar phase line each in described duplexure again, determine and to adjust The phase place of customer charge at whole corresponding phase-change switch automatically；

Described three-phase load current balance type main controller, according to the situation of this Zhi Huilu three-phase load current imbalance, by nothing Line or wire communication mode issue control instruction to certainly moving in corresponding cell list case in this Zhi Huilu or joint household table case Switch mutually, carry out the conversion of load phase place, realize the tune of each loop three-phase load current balance type of distribution transformer low-pressure side Whole；

Or, described three-phase load current balance type main controller, issue control instruction to institute by wirelessly or non-wirelessly communication modes State the automatic phase-change switch at user on corresponding phase line, carry out the conversion of load phase place, realize distribution transformer low pressure The adjustment of Ge Zhi loop, side three-phase load current balance type；

Described three-phase load current balance type main controller, by three in each loop in control/regulation distribution transformer platform area Phase load current balance type, thus realize the adjustment of distribution transformer low voltage side master loop three-phase load current balance type, to greatest extent Ground reduces line loss, improves the quality of voltage of each loop phase line end of distribution transformer low-pressure side, improves the fortune of distribution transformer Row safety, effectively extends its service life, effectively reduces power supply cost and running cost, it is ensured that power network line safe, Stable operation.

11. according to the cloth platform district branch road three-phase load current balance type supervising device described in claim 8,9 or 10, and it is special Levy and be that described electronic breaker is electronic type residual current circuit breaker.