CN203135457U - 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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- CN203135457U CN203135457U CN 201320062701 CN201320062701U CN203135457U CN 203135457 U CN203135457 U CN 203135457U CN 201320062701 CN201320062701 CN 201320062701 CN 201320062701 U CN201320062701 U CN 201320062701U CN 203135457 U CN203135457 U CN 203135457U
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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
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- 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 and a liquid crystal display unit, 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, the operation unit carries out operational analysis on acquired data to obtain an adjustment amount of three-phase load of the low-voltage distribution box, and the adjustment amount is transmitted to the liquid crystal display unit through a line. 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 adjusting device 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, make the three-phase load imbalance become comparison distinct issues in the low voltage electric network operation maintenance, analyze the influence that the three-phase load imbalance is brought from the quality of power supply and two aspects of grid loss: the one, the uneven impact analysis that produces the quality of power supply of three-phase load.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.In the secondary low-voltage supply power mode, generally take 34 line systems power supplies mutually.Distribution transforming low-pressure side 3 phase load imbalances are embodied directly in the asymmetric of 3 phase load electric currents, analyze positive sequence, negative phase-sequence, the zero-sequence current that 3 mutually asymmetric electric currents can be decomposed into symmetry from the principle of Electrical Motor, 3 phase loads that also can simply regard symmetry as add the stack of single-phase load.Because a winding of distribution transformer does not have the neutral line, so can't be in balance in winding at zero-sequence current that the secondary winding side produces, zero-sequence current produces voltage drop at zero sequence resistance directly have been caused having produced the neutral point position skew at the distribution transforming secondary side.The simple circuit theory of same basis also can analyze, because at A, B, the load of C phase does not wait, so at A, B, electric current on the C three-phase does not just wait yet, A so, B, C three-phase current vector and generally be not equal to 0, just the electric current on the neutral line generally is not equal to 0, also be that neutral line current generally is not equal to 0, under actual conditions, the resistance of zero line is not equal to 0, just has voltage like this on zero line, has formed neutral point displacement, caused A, B, the phase voltage of C phase is 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, so it is more big to work as the difference of three-phase load, just the current imbalance degree of three-phase load is more big, and the displacement of neutral point is also just more big so, so cause the deviation of voltage also just more big.Most of low-voltage loads are illumination and household electrical appliance in the distribution of city, these all are single-phase loads, the enabling time of user's single-phase load is not again not simultaneously simultaneously, so the imbalance of three-phase current will be clearly, caused certain user's voltage on the low side, some user's voltage is higher, particularly during the summer peak of power consumption, we find to have connect many air-conditionings mutually some distribution transforming a certain, will produce monophase current when starting at the same time and seriously surpass other two-phases, the voltage that causes this to go up mutually is on the low side, and some user's electrical equipment can't be started.Here it is, and 3 phase load imbalances cause 3 phase currents, voltage the reason of asymmetric generation to occur.The 2nd, when 3 phase loads are uneven, the loss that produces at low pressure 3 phase circuits will increase, and current in middle wire is non-vanishing simultaneously, also can produce loss, increases to some extent in the time of will making low-voltage circuit loss ratio balance.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.In sum, low-voltage network three-phase load imbalance will reduce distribution transforming and exert oneself, and increase the power loss on the low-voltage circuit, influence 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 adjusting device 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 adjusting device, wherein said low-tension distribution box are taked the three-phase and four-line power supply, comprising: current measuring device, the storage arithmetic unit and the liquid crystal display that are connected with current measuring device;
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 the regulated quantity that operational analysis draws the low-tension distribution box three-phase load, and be transferred to liquid crystal display by communication line.
Further, 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, liquid crystal display comprises display unit and display operation button.
Advantage of the present utility model and beneficial effect are as follows:
1. owing to adopt this device, can show the regulated quantity of three-phase load in real time, by the manual adjustment three-phase load, effectively solve the energy waste problem of the voltage instability that the low-tension distribution box three-phase imbalance brings, low-voltage circuit loss;
2. this device is simple to operate, and is easy for installation, be suitable for the installation in the distribution box;
3. this installation cost is low, and loss is very little, and effect is apparent in view.
Description of drawings
Fig. 1 is the structured flowchart of a kind of low-tension distribution box three-phrase burden balance of the utility model one preferred embodiment adjusting device.
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 adjusting device comprises current measuring device 1, the storage arithmetic unit 2 that is connected with current measuring device 1 and liquid crystal display 3;
Preferably, 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 the regulated quantity that operational analysis draws the low-tension distribution box three-phase load by 5 pairs of data that collect of arithmetic element, and be transferred to liquid crystal display 3 by circuit.
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.
Further, described 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.
Further, described liquid crystal display 3 comprises display unit 7 and display operation button 8, and display unit is the LCD LCD, check the three-phase load regulated quantity by the display operation button, the manual adjustment three-phase load changes 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 adjusting device, 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);
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 the regulated quantity that operational analysis draws the low-tension distribution box three-phase load, and be transferred to liquid crystal display (3) by circuit.
2. a kind of low-tension distribution box three-phrase burden balance adjusting device 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 adjusting device according to claim 1, it is characterized in that: described liquid crystal display (3) comprises display unit (7) and display operation button (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320062701 CN203135457U (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 |
|---|---|---|---|
| CN 201320062701 CN203135457U (en) | 2013-02-04 | 2013-02-04 | Three-phase load equalization adjusting apparatus for low-voltage distribution box |
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| CN203135457U true CN203135457U (en) | 2013-08-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201320062701 Expired - Lifetime CN203135457U (en) | 2013-02-04 | 2013-02-04 | Three-phase load equalization adjusting apparatus for low-voltage distribution box |
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Cited By (2)
| 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 |
| CN110007159A (en) * | 2019-04-15 | 2019-07-12 | 国网山东省电力公司德州市陵城区供电公司 | A kind of distribution transformer load three-phase imbalance measuring instrument and its application method |
-
2013
- 2013-02-04 CN CN 201320062701 patent/CN203135457U/en not_active Expired - Lifetime
Cited By (2)
| 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 |
| CN110007159A (en) * | 2019-04-15 | 2019-07-12 | 国网山东省电力公司德州市陵城区供电公司 | A kind of distribution transformer load three-phase imbalance measuring instrument and its application method |
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| C14 | Grant of patent or utility model | ||
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130814 |