CN110957747A - Low-voltage automatic pre-distribution three-phase line balance box - Google Patents
Low-voltage automatic pre-distribution three-phase line balance box Download PDFInfo
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- CN110957747A CN110957747A CN201911209429.0A CN201911209429A CN110957747A CN 110957747 A CN110957747 A CN 110957747A CN 201911209429 A CN201911209429 A CN 201911209429A CN 110957747 A CN110957747 A CN 110957747A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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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
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Abstract
The invention relates to the related technical field of distribution equipment, in particular to a low-voltage distribution box, which is particularly suitable for a distribution system for adjusting three-phase load to be uniformly distributed. Automatic predistribution three-phase line balance box of low pressure, its characterized in that: the structure of the box body consists of a three-phase power supply input end, a cluster distribution module and a single-phase power supply centralized output end; the low-voltage automatic pre-distribution three-phase line balancing box is connected in series between a three-phase line at the low-voltage side of the transformer and a user single-phase electric meter box, and A, B, C three-phase power supplies are redistributed in the box by taking each two phases as a group, so that the two-phase power supplies are connected to the input end of each intelligent phase modulation device, and the single-phase power supplies are output to the user electric meter box by the output end of the intelligent phase modulation device; has the advantages that: under the condition that the original low-voltage distribution system is not changed, the low-voltage automatic pre-distribution three-phase line balance box is additionally arranged, the utilization rate of electric energy can be effectively improved, and the electric energy quality is improved.
Description
Technical Field
The invention relates to the related technical field of distribution equipment, in particular to a low-voltage distribution box, which is particularly suitable for a distribution system for adjusting three-phase load to be uniformly distributed.
Background
The optimal design of present block terminal is all from aspects research such as drainage, insulation, control by temperature change, maintenance, structure, and rarely will be relevant three-phase modulation device design in the box. Three-phase load balance is the basis of safe power supply, and three-phase load is unbalanced, so that the power supply efficiency of a line and a distribution transformer is reduced if the three-phase load is not balanced, and serious consequences such as burnout of a certain phase lead, burnout of a switch, even single-phase burnout of the distribution transformer and the like can be caused if the heavy-load phase is overloaded. The method is proposed in national standard 'design specification of power supply and distribution system GB 50052-2009': the power supply and distribution system is designed to reduce voltage deviation and preferably balance three-phase load. If the best solution for balancing the load is the uniform distribution of the three-phase load, because the change of the load is dynamic, a special intelligent phase modulation device is needed to be used for carrying out follow-up adjustment on a power distribution system in real time according to the change of the load, one device is not enough for adjusting the load change quantity of the whole power distribution area, an intelligent phase modulation device needs to be installed before the inlet wire of each user electric meter, and if all users in the power distribution area are provided with the intelligent phase modulation devices, the following steps are required:
firstly, the existing user electric meter box is improved and upgraded, and phase modulation equipment is added;
and secondly, phase modulation equipment is installed by using a new special power distribution cabinet.
Disclosure of Invention
In order to solve the problems, the invention provides a novel low-voltage automatic pre-distribution three-phase line balancing box which is specially used for installing an intelligent phase modulation device. A plurality of intelligent phase modulation devices are arranged in the box, the number of the intelligent phase modulation devices is the same as that of the single-phase user electric meters, and each phase modulation device controls and connects one phase of two-phase power supplies to the user electric meters; the phase modulation devices correspond to a plurality of single-phase user electric meters, each phase modulation device generates phase modulation actions according to respective optimal algorithms, all the intelligent phase modulation devices are integrated together to be regarded as an intelligent phase modulation group, the phase modulation group organically works, a three-phase user line connected with the electric meters in a box can be adjusted on the most appropriate phase in a three-phase power supply, and each low-voltage automatic pre-distribution three-phase line balancing box can enable the three-phase load distribution in a building or a floor to tend to be balanced.
The invention is realized by the following technical scheme:
1. automatic predistribution three-phase line balance box of low pressure, its characterized in that: the structure of the box body consists of a three-phase power supply input end, a cluster distribution module and a single-phase power supply centralized output end; the low-voltage automatic pre-distribution three-phase line balancing box is connected in series between a three-phase line at the low-voltage side of the transformer and a user single-phase electric meter box, and A, B, C three-phase power supplies are redistributed in the box by taking each two phases as a group, so that the two-phase power supplies are connected to the input end of each intelligent phase modulation device, and the single-phase power supplies are output to the user electric meter box by the output end of the intelligent phase modulation device;
three-phase power input end: a, B, C three-phase power lines and N lines are connected in parallel in a three-phase four-wire system low-voltage distribution line on the secondary side of the transformer, and A, B, C, N four lines are connected to the cluster distribution module; the main function is to install the incoming line to the low-voltage three-phase four-wire system line through the reserved incoming line port.
A cluster distribution module: the intelligent phase modulation device comprises a plurality of intelligent phase modulation devices, the number of the intelligent phase modulation devices is the same as that of the electric meters in the adjacent single-phase electric meter box, and the cluster distribution module is connected between the three-phase power supply input end and the single-phase power supply centralized output end in series; the intelligent phase modulation device has the main function that every two phases of a three-phase four-wire system circuit entering from a wire inlet are redistributed as a group, so that the input end of each intelligent phase modulation device is connected with a two-phase power supply, and the output end of the intelligent phase modulation device outputs a single-phase power supply to a single-phase power supply centralized output end.
Single-phase power centralized output end: connecting the distributed single-phase line group with the incoming line end of the user single-phase electric meter box; the main function is to connect the single-phase loop adjusted by the intelligent phase adjusting device to the user terminal.
Compared with the prior art, the invention has the beneficial effects that:
the invention relates to a distribution box specially designed for installing intelligent phase modulation devices, wherein a plurality of intelligent phase modulation devices installed in a box body can be regarded as an organic cooperative cluster, and the distribution box is an intelligent phase modulation distribution system related to buildings or partial floors from the perspective of the system. Under the condition that the original low-voltage distribution system is not changed, the low-voltage automatic pre-distribution three-phase line balance box is additionally arranged, and the utilization rate of electric energy can be effectively improved. The distribution box is not only a shell for loading power supply and distribution equipment, but also has the function of improving the quality of electric energy.
When the new distribution box covers the user line in a large area, the balance of the power grid of the whole distribution area can be adjusted. In a platform area, each low-voltage automatic pre-distribution three-phase line balancing box cooperates with each other to form a unit, each individual in the unit works orderly to adjust the three-phase low-voltage line in the platform area in real time according with the load change of the current line, to keep the operation of the current line for the user who has used electric energy and generates power grid fluctuation, to adjust the user line of the user line which does not use electric energy or uses electric energy to have small power grid fluctuation to the optimal state, so as to achieve the function of pre-distribution lines, and the optimal state is as follows: under one station change, with the continuous access of user loads, the loads of three-phase lines approach to balance, and the current of a central line approaches to zero.
Drawings
Fig. 1 is a schematic structural diagram of a low-voltage automatic pre-distribution three-phase line balancing box.
Fig. 2 is a system structure diagram of a low-voltage automatic pre-distribution three-phase line balancing box.
Fig. 3 is a first exemplary embodiment of a low-voltage automatic pre-distribution three-phase line balancing box.
Fig. 4 is a second exemplary embodiment of the low-voltage automatic pre-distribution three-phase line balancing box.
Detailed description of the preferred embodiments
In order to make the technical means, the creation features, the achievement purposes and the effects of the invention easy to understand, the invention is described in the following with reference to fig. 1 and fig. 2.
As shown in fig. 1, a low-voltage automatic pre-distribution three-phase line balancing box is composed of a three-phase power input terminal, a cluster distribution module and a single-phase power centralized output terminal; the low-voltage automatic pre-distribution three-phase line balancing box is connected between a three-phase line on the low-voltage side of the transformer and a user single-phase electric meter box in series, A, B, C three-phase power supplies are redistributed in the distribution box by taking every two phases as a group, so that the input end of each intelligent phase modulation device is connected with the two-phase power supplies, the output end of each intelligent phase modulation device outputs the single-phase power supplies to the single-phase power supply centralized output end, and the output end of each intelligent phase modulation device is connected to.
In a three-phase four-wire low-voltage distribution line on the secondary side of the transformer, a three-phase power input end is connected into A, B, C three-phase power lines and an N line in a parallel mode, and A, B, C, N four lines are connected to a cluster distribution module. The cluster distribution module is composed of a plurality of intelligent phase modulation devices, the number of the devices is the same as that of the electric meters in the adjacent single-phase electric meter box, and the cluster distribution module is connected between the three-phase power supply input end and the single-phase power supply centralized output end in series. The intelligent phase modulation device has the main function that every two phases of a three-phase four-wire system circuit entering from a wire inlet are redistributed as a group, so that the input end of each intelligent phase modulation device is connected with a two-phase power supply. The output end of the intelligent phase modulation device outputs a single-phase power supply to the single-phase power supply centralized output end, the single-phase power supply centralized output end connects the distributed single-phase line group with the incoming line end of the user single-phase electric meter box, and the single-phase circuit adjusted by the intelligent phase modulation device is connected to the user end. After the line connection is finished, a new intelligent distribution box is formed, each intelligent phase modulation module in the distribution box makes phase modulation actions according to respective algorithm, the number of phase modulation devices is the same as that of user electric meters, all the phase modulation devices in the box can be regarded as phase modulation groups adjusted corresponding to user lines, the organic work of the phase modulation groups can regulate and control a three-phase power supply line to be connected into a user single-phase line in real time, and therefore the fact that the user line corresponding to the electric meters in the box is redistributed under the control of the algorithm model is achieved, the distribution box loaded with the intelligent phase modulation groups is an intelligent distribution system related to buildings or partial floors from the perspective of the system.
As shown in fig. 2, a system structure of a low-voltage automatic pre-distribution three-phase line balancing box comprises a transformer, a low-voltage automatic pre-distribution three-phase line balancing box group and a user. The transformer is used as a power supply part, a low-voltage automatic pre-distribution three-phase line balancing box is used as a conversion part, and a user is used as a load part. When the low-voltage automatic pre-distribution three-phase line balancing box covers a user line in a large area, the balancing box plays an important role in adjusting the balance of the power grid of the whole platform area. In a platform district, each low-voltage automatic pre-distribution three-phase line balancing box cooperates with each other to form a unit, each individual in the unit works orderly to adjust the three-phase low-voltage line in the platform district in real time according with the load change of the current line, to keep the operation of the current line for the user who has used electric energy and generates power grid fluctuation, to adjust the user line of the user line which does not use electric energy or uses electric energy to have less power grid fluctuation to the optimal state, to achieve the function of pre-distribution line, the optimal state is: under one station change, with the continuous access of user loads, the loads of three-phase lines approach to balance, and the current of a central line approaches to zero.
Under the condition that the original low-voltage distribution system is not changed, a low-voltage automatic pre-distribution three-phase line balance box is additionally arranged, and the utilization rate of electric energy can be effectively improved.
As shown in fig. 3, a typical embodiment of a low-voltage automatic pre-distribution three-phase line balancing box is as follows: the three-phase power supply centralized output circuit is composed of a three-phase circuit breaker, a three-phase power supply input end, a cluster distribution module and a single-phase power supply centralized output end. The three-phase circuit breaker is connected in series between the input end of the three-phase power supply and the three-phase line on the low-voltage side of the transformer. The remaining connection structure is consistent with the description of figure one. The main functions are as follows: when the balance box is installed or maintained, the three-phase circuit breaker is disconnected, and a secondary side three-phase circuit and a return circuit of the balance box are cut off, so that personal safety is ensured.
As shown in fig. 4, a second exemplary embodiment of a low-voltage automatic pre-distribution three-phase line balancing box: the system consists of a three-phase circuit breaker, a three-phase power supply input end, a single-phase circuit breaker, a cluster distribution module and a single-phase power supply centralized output end. The three-phase circuit breaker is connected in series between the input end of the three-phase power supply and the three-phase line on the low-voltage side of the transformer. The single-phase circuit breaker is connected in series between the input end of the three-phase power supply and the wiring of the two phase power supplies of the intelligent phase modulation device. The remaining connection structure is consistent with the description of figure one. The main functions are as follows: when the balance box is installed, the three-phase circuit breaker is disconnected, and a loop of a secondary side three-phase line and the balance box is cut off. When the balance box is maintained, the fault phenomenon of which device or the user corresponding to the device is basically judged by observing the state of the single-phase circuit breaker, and the investigation range is effectively reduced.
The foregoing is an embodiment of the present invention, and it will be apparent to those skilled in the art that other changes, modifications, alterations and substitutions can be made according to the technical solutions and concepts described above, and the embodiments can be changed, modified and replaced without departing from the principle of the present invention.
Claims (2)
1. The utility model provides a low pressure is automatic distributes three-phase line balance box in advance which characterized in that: the structure of the box body consists of a three-phase power supply input end, a cluster distribution module and a single-phase power supply centralized output end; the low-voltage automatic pre-distribution three-phase line balancing box is connected in series between a three-phase line at the low-voltage side of the transformer and a user single-phase electric meter box, and A, B, C three-phase power supplies are redistributed in the box by taking each two phases as a group, so that the input end of each intelligent phase modulation device is connected with the two-phase power supplies, and the output end of the intelligent phase modulation device outputs the single-phase power supply to the single-phase power supply centralized output end;
three-phase power input end: a, B, C three-phase power lines and N lines are connected in parallel in a three-phase four-wire system low-voltage distribution line on the secondary side of the transformer, and A, B, C, N four lines are connected to the cluster distribution module;
a cluster distribution module: the intelligent phase modulation device comprises a plurality of intelligent phase modulation devices, the number of the intelligent phase modulation devices is the same as that of the electric meters in the adjacent single-phase electric meter box, and the cluster distribution module is connected between the three-phase power supply input end and the single-phase power supply centralized output end in series;
single-phase power centralized output end: and connecting the distributed single-phase line group with the incoming line end of the user single-phase electric meter box.
2. The use method of the low-voltage automatic pre-distribution three-phase line balancing box is characterized by comprising the following steps of: installing intelligent phase modulation devices with the same number as that of the single-phase user electric meters in a low-voltage automatic pre-distribution three-phase line balance box, wherein each intelligent phase modulation device controls and connects one phase of a two-phase power supply to the user electric meters; the phase modulation devices correspond to a plurality of single-phase user electric meters, each phase modulation device generates phase modulation actions according to respective optimal algorithms, all the phase modulation devices are integrated together to be regarded as phase modulation groups corresponding to three-phase user lines, and the organic work of the phase modulation groups can adjust the three-phase user lines connected in the box through the electric meters to the most appropriate phase in a three-phase power supply.
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| CN201911209429.0A CN110957747A (en) | 2019-12-01 | 2019-12-01 | Low-voltage automatic pre-distribution three-phase line balance box |
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| CN201911209429.0A CN110957747A (en) | 2019-12-01 | 2019-12-01 | Low-voltage automatic pre-distribution three-phase line balance box |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012039727A (en) * | 2010-08-05 | 2012-02-23 | Chugoku Electric Power Co Inc:The | Phase modification control system, phase modification controller, smart meter and phase modification control method |
| CN104752968A (en) * | 2014-12-01 | 2015-07-01 | 宁波天顺电气有限公司 | Power box with dual power supplies |
| CN205921394U (en) * | 2016-08-25 | 2017-02-01 | 西安浩源电力科技有限公司 | Automatic phasing switch of unbalanced three phase |
| CN206461372U (en) * | 2017-02-21 | 2017-09-01 | 浙江亿德科技有限公司 | Power distribution station three-phase load unbalance automatic regulating system |
| CN109510221A (en) * | 2018-11-29 | 2019-03-22 | 国网安徽省电力有限公司滁州供电公司 | The device and method of three-phase imbalance adjustment based on power information acquisition system |
| CN209571835U (en) * | 2019-03-28 | 2019-11-01 | 广西云涌科技有限公司 | A kind of commutation device suitable for Building Power Distribution route |
-
2019
- 2019-12-01 CN CN201911209429.0A patent/CN110957747A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012039727A (en) * | 2010-08-05 | 2012-02-23 | Chugoku Electric Power Co Inc:The | Phase modification control system, phase modification controller, smart meter and phase modification control method |
| CN104752968A (en) * | 2014-12-01 | 2015-07-01 | 宁波天顺电气有限公司 | Power box with dual power supplies |
| CN205921394U (en) * | 2016-08-25 | 2017-02-01 | 西安浩源电力科技有限公司 | Automatic phasing switch of unbalanced three phase |
| CN206461372U (en) * | 2017-02-21 | 2017-09-01 | 浙江亿德科技有限公司 | Power distribution station three-phase load unbalance automatic regulating system |
| CN109510221A (en) * | 2018-11-29 | 2019-03-22 | 国网安徽省电力有限公司滁州供电公司 | The device and method of three-phase imbalance adjustment based on power information acquisition system |
| CN209571835U (en) * | 2019-03-28 | 2019-11-01 | 广西云涌科技有限公司 | A kind of commutation device suitable for Building Power Distribution route |
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