CN203135456U - Three-phase load equalization adjusting apparatus for low-voltage distribution box - Google Patents
Three-phase load equalization adjusting apparatus for low-voltage distribution box Download PDFInfo
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- CN203135456U CN203135456U CN 201320062663 CN201320062663U CN203135456U CN 203135456 U CN203135456 U CN 203135456U CN 201320062663 CN201320062663 CN 201320062663 CN 201320062663 U CN201320062663 U CN 201320062663U CN 203135456 U CN203135456 U CN 203135456U
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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 utility model discloses a three-phase load equalization adjusting apparatus for a low-voltage distribution box. The low-voltage distribution box is powered by using a three-phase four-wire system. The three-phase load equalization adjusting apparatus comprises a current measuring device, a storage and operation device connected with the current measuring unit, a liquid crystal display unit, a radio communication unit and a master station system, wherein the storage and operation device comprises an A/D converting unit, an operation unit and a storage module, the A/D converting unit carries out A/D conversion on a current signal acquired by the current measuring device to convert the current signal into an acquirable and storable data signal which is stored in the storage module, measured data is transmitted to the liquid crystal display unit, the measured data signal is transmitted to the master station system through the radio communication unit at the same time, the master station system stores the measured data and carries out operation after receiving the measured data transmitted by the radio communication unit, and an adjustment amount of three-phase load of the low-voltage distribution box is obtained through analysis and then displayed on the master station system. The utility model aims to provide the three-phase load equalization adjusting apparatus with the advantages of convenient installation, equalization of three-phase load and reduction in line loss for the low-voltage distribution box.
Description
Technical field
The utility model relates to the low-voltage distribution technical field, relates in particular to a kind of three-phrase burden balance regulating system that is suitable for low-tension distribution box.
Background technology
Most of distribution transformer all adopts three-phase transformer in the power distribution network of current town and country, transformer outlet three-phase load should reach symmetry in theory, but in low-voltage network, exist a large amount of single-phase loads particularly to comprise resident's load, because the asynchronism of the unbalanced and making time that single-phase load distributes makes the three-phase load imbalance become comparison distinct issues in the low voltage electric network operation maintenance.
All adopt the mode of connection of Dyn11 or employing Yyn0 at present at the winding connection of 10 kilovolts of distribution transformings, winding of distribution transforming does not have the neutral line, secondary winding neutral earthing, and is connected to zero line, generally takes 34 line systems power supplies mutually in the secondary low-voltage supply power mode.Most of low-voltage loads are illumination and household electrical appliance in the distribution of city, and these all are single-phase loads, and simultaneously the enabling time of user's single-phase load makes the three-phase load imbalance again not simultaneously.This does not just directly wait the electric current on A, B, the C three-phase, and A, B, C three-phase current vector and generally be not equal to 0 also are that neutral line current generally is not equal to 0, thereby just have voltage on zero line, form neutral point displacement, cause the phase voltage of A, B, C phase asymmetric.When a certain load that connects on mutually is more big, this voltage of going up mutually is also just more low, and the voltage of two-phase will uprise in addition.When the difference of three-phase load is more big, just the current imbalance degree of three-phase load is more big, and the displacement of neutral point is also just more big, and the deviation of voltage is also more big, thereby the user's quality of voltage that causes is on the low side.
Because 3 phase load imbalances, the loss that produces at low pressure 3 phase circuits increases in the time of will balancing each other than 3, and current in middle wire is non-vanishing simultaneously, also can produce loss, like this, increases to some extent during low-voltage circuit loss ratio balance.Degree of unbalance is more big, and loss will be more big.Though be not too big owing to the three-phase load imbalance causes distribution transforming self electric energy loss loss in whole power distribution network at present, can not ignore.Can to make 3 phase current imbalances, the current in middle wire of the distribution transformer of flowing through be not 0 to unbalanced 3 phase currents yet on a plurality of low-voltage distributing lines, thereby increase the loss of distribution transformer, even reduce distribution transforming and exert oneself.
In sum, low-voltage network three-phase load imbalance, the power loss with increasing on the low-voltage circuit influences quality of voltage.Therefore proposing transformer threephase load unbalance factor in the rules of relevant design and operation can not be greater than 25%.Become the important process of carrying out the power distribution network operation so solve the three-phase load imbalance.
At present, topmost method is the artificial three-phase load electric current of regularly measuring, and regulates three-phase load according to the data of measuring, and makes load obtain certain adjusting, reduces loss.But manual measurement load current workload is big, and it is few to measure number of times, and randomness is strong, is difficult to reach good effect.If regulate the low-voltage circuit three-phase loads by increasing technology such as electric capacity, inductance, make the in good time balance of three-phase load, then increased fund input, the device of Tou Ruing also can increase loss simultaneously, economically and be difficult to the effect that reaches desirable on the implementation result.Though more existing devices can be measured the three-phase current of low-tension distribution box, do not provide the concrete scheme of regulating three-phase load.Therefore, prior art exists certain deficiency.
Summary of the invention
At above deficiency of the prior art, the low-tension distribution box three-phrase burden balance regulating system that the purpose of this utility model is to provide a kind of easy for installation, balance three-phase load, the low-voltage circuit loss is reduced.
For achieving the above object, the technical solution of the utility model is:
A kind of low-tension distribution box three-phrase burden balance regulating system, wherein said low-tension distribution box is taked the three-phase and four-line power supply, comprising: current measuring device, the storage arithmetic unit that is connected with current measuring device and liquid crystal display, wireless communication unit, main station system.
Described storage arithmetic unit comprises A/D converting unit, arithmetic element, memory module, wherein A/D converting unit current signal that described current measuring device is collected carries out the A/D conversion, become and to gather stored data signal and store in the memory module, and by arithmetic element the data that collect are carried out computing, and be transferred to liquid crystal display by circuit and show measurement data.The storage arithmetic unit is sent to the main station system communication unit with measurement data, thereby is sent to main station system by wireless communication unit.
Described main station system comprises main station system arithmetic element, main station system memory cell, main station system display unit, main station system communication unit; The main station system communication unit receives the low-tension distribution box three-phase load measurement data of sending on the wireless communication unit, send the main station system arithmetic element to, the main station system arithmetic element is through computing, calculate the regulated quantity of low-tension distribution box three-phase load, measurement data and regulated quantity are stored in the main station system memory cell, and show at the main station system display unit.
Further, described current measuring device comprises respectively A phase current mutual inductor I, B phase current mutual inductor II, the C phase current mutual inductor III that is connected mutually with A phase, B phase, the C of low-tension distribution box.
Further, described current measuring device, the storage arithmetic unit that is connected with current measuring device and liquid crystal display, wireless communication unit are measurement mechanism, be installed in low-tension distribution box, the main station system centralized configuration is in the place of appointment, as office, the data that can receive a plurality of low-tension distribution box wireless communication units are handled, and calculate the regulated quantity of corresponding low-tension distribution box three-phase load.
Advantage of the present utility model and beneficial effect are as follows:
1. owing to adopt native system, can show three-phase load amount of unbalance and the regulated quantity of distribution box in real time, can regulate in real time, effectively solve the voltage instability that the low-tension distribution box three-phase imbalance brings, the energy waste problem of low-voltage circuit loss thus;
2. native system is simple to operate, and is easy for installation, is convenient to the distribution box service data is stored and monitored.
Description of drawings
Fig. 1 is the system diagram of a kind of low-tension distribution box three-phrase burden balance of the utility model one preferred embodiment regulating system.
Embodiment
The utility model of embodiment of an indefiniteness that provides below in conjunction with accompanying drawing is further elaborated.
With reference to Fig. 1, low-tension distribution box three-phrase burden balance regulating system comprises: current measuring device 1, the storage arithmetic unit 2 that is connected with current measuring device 1 and liquid crystal display 3, wireless communication unit 9, main station system 10.
Storage arithmetic unit 2 comprises A/D converting unit 4, arithmetic element 5, memory module 6, wherein the current signal that collects of 4 pairs of described current measuring devices 1 of A/D converting unit carries out the A/D conversion, become and to gather stored data signal and store in the memory module 6, and carry out computing by 5 pairs of data that collect of arithmetic element, and be transferred to liquid crystal display 3 by communication line and show measurement data.Storage arithmetic unit 2 is sent to main station system communication unit 14 with measurement data, thereby is sent to main station system 10 by wireless communication unit 9.
Main station system 10 comprises main station system arithmetic element 11, main station system memory cell 12, main station system display unit 13, main station system communication unit 14; Main station system communication unit 14 receives the low-tension distribution box three-phase load measurement data of sending on the wireless communication unit 9, send main station system arithmetic element 11 to, main station system arithmetic element 11 is through computing, calculate the regulated quantity of low-tension distribution box three-phase load, measurement data and regulated quantity are stored in main station system memory cell 12, and show at main station system display unit 13.
Current measuring device 1 comprises respectively A phase current mutual inductor I, B phase current mutual inductor II, the C phase current mutual inductor III that is connected mutually with A phase, B phase, the C of low-tension distribution box.
Current measuring device 1, the storage arithmetic unit 2 that is connected with current measuring device 1 and liquid crystal display 3, wireless communication unit 9 are measurement mechanism, are installed in low-tension distribution box.Main station system 10 centralized configuration are in the place of appointment, and as office etc., the data that can receive a plurality of low-tension distribution box wireless communication units 9 are handled, and calculate the regulated quantity of corresponding low-tension distribution box three-phase load, form a cover system.Can adopt communication modes such as GPRS, CDMA between wireless communication unit 9 and the main station system communication unit 14, owing to need to realize transfer of data by communication common carrier, can pay a spot of communication cost according to amount of communication data.
Preferably, when calculating the regulated quantity of three-phase load, wherein the computing formula of A phase load regulated quantity is as follows:
The computing formula of B phase load regulated quantity is as follows:
The computing formula of C phase load regulated quantity is as follows:
In the formula,
Be A phase load sample rate current,
Be B phase load sample rate current,
Be C phase load sample rate current, regulated quantity should increase load at this mutually for just representing, regulated quantity is that negative indication should reduce the load user mutually at this.Owing to adopt computer to carry out computing at main station system, A, B, C three-phase load regulated quantity also can calculate optimum three-phase load regulated quantity according to other formula, and the computing formula that is not limited only to provide.
The operation maintenance personnel check the three-phase load regulated quantity by main station system display unit 13, and the manual adjustment three-phase load reduces the three-phase load degree of unbalance.
Need explanation, because the asynchronism of the unbalanced and making time that single-phase load distributes, take any method, three-phase load can not reach the balance on any time completely, this programme will greatly improve the uneven degree of low pressure three-phase load, reduce the low-voltage circuit loss, improve quality of voltage.
These embodiment are interpreted as only being used for explanation the utility model and are not used in restriction protection range of the present utility model.After the content of having read record of the present utility model, the technical staff can make various changes or modifications the utility model, and these equivalences change and modification falls into the utility model claim institute restricted portion equally.
Claims (3)
1. low-tension distribution box three-phrase burden balance regulating system, wherein said low-tension distribution box is taked the three-phase and four-line power supply, it is characterized in that comprising: current measuring device (1), the storage arithmetic unit (2) that is connected with current measuring device (1) and liquid crystal display (3), wireless communication unit (9) and main station system (10);
Described storage arithmetic unit (2) comprises A/D converting unit (4), arithmetic element (5), memory module (6), wherein A/D converting unit (4) current signal that described current measuring device (1) is collected carries out the A/D conversion, become and to gather stored data signal and store in the memory module (6), and by arithmetic element (5) data that collect are carried out computing, and be transferred to liquid crystal display (3) by circuit and show measurement data, storage arithmetic unit (2) is by wireless communication unit (9), measurement data is sent to main station system communication unit (14), thereby is sent to main station system (10);
Described liquid crystal display (3) comprises display unit (7) and display operation button (8);
Described main station system (10) comprises main station system arithmetic element (11), main station system memory cell (12), main station system display unit (13) and main station system communication unit (14); Described main station system communication unit (14) receives the low-tension distribution box three-phase load measurement data of wireless communication unit (9) transmission, be transferred to main station system arithmetic element (11), main station system arithmetic element (11) is through computing, calculate the regulated quantity of low-tension distribution box three-phase load, measurement data and regulated quantity are stored in main station system memory cell (12), and show at main station system display unit (13).
2. a kind of low-tension distribution box three-phrase burden balance regulating system according to claim 1 is characterized in that: described current measuring device (1) comprises respectively A phase current mutual inductor I, B phase current mutual inductor II and the C phase current mutual inductor III that is connected mutually with A phase, B phase, the C of low-tension distribution box.
3. a kind of low-tension distribution box three-phrase burden balance regulating system according to claim 1, it is characterized in that: described current measuring device (1), the storage arithmetic unit (2) that is connected with current measuring device (1) and liquid crystal display (3), wireless communication unit (9) are measurement mechanism, be installed in low-tension distribution box, described main station system (10) is used for receiving the data of at least one low-tension distribution box wireless communication unit (9) and handling, and calculates the regulated quantity of corresponding low-tension distribution box three-phase load.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320062663 CN203135456U (en) | 2013-02-04 | 2013-02-04 | Three-phase load equalization adjusting apparatus for low-voltage distribution box |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201320062663 CN203135456U (en) | 2013-02-04 | 2013-02-04 | Three-phase load equalization adjusting apparatus for low-voltage distribution box |
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| CN203135456U true CN203135456U (en) | 2013-08-14 |
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| CN 201320062663 Expired - Lifetime CN203135456U (en) | 2013-02-04 | 2013-02-04 | Three-phase load equalization adjusting apparatus for low-voltage distribution box |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106597073A (en) * | 2016-12-06 | 2017-04-26 | 山东卓尔电气有限公司 | Integrated integrating current type module |
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2013
- 2013-02-04 CN CN 201320062663 patent/CN203135456U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106597073A (en) * | 2016-12-06 | 2017-04-26 | 山东卓尔电气有限公司 | Integrated integrating current type module |
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