CN206076958U - A kind of power distribution network low-voltage governing system - Google Patents
A kind of power distribution network low-voltage governing system Download PDFInfo
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- CN206076958U CN206076958U CN201621147698.0U CN201621147698U CN206076958U CN 206076958 U CN206076958 U CN 206076958U CN 201621147698 U CN201621147698 U CN 201621147698U CN 206076958 U CN206076958 U CN 206076958U
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Abstract
This utility model is related to a kind of power distribution network low-voltage governing system, belong to regulating and controlling voltage technical field, described power distribution network low-voltage governing system includes input ammeter, input terminal voltage table, frequency modulator, 3-phase autotransformer, output end voltage table, motor, described 3-phase autotransformer includes shunting switch, input terminal voltage table, input ammeter, 3-phase autotransformer are arranged in main circuit, main circuit is electrically connected with frequency modulator, frequency modulator is connected with shunting switch with electronic mechatronics, motor；The outgoing line side lead of 3-phase autotransformer installs control coil, Zenith tracking module；This utility model can automatically adjust voltage change ratio, output burning voltage, reach circuit stable.About the 20% of rated voltage, effectively voltage can be adjusted, it is ensured that export in the range of defined in rural power grids supply line terminal voltage.
Description
Technical field
This utility model is related to regulating and controlling voltage technology, particularly a kind of power distribution network low-voltage governing system.
Background technology
In recent years, the relevant power department such as national grid increasingly payes attention to " low-voltage " phenomenon, relevant as shown by data, normally
In the case of the average line loss per unit of China be about 8.48%, line loss electricity is up to 367.75 hundred million kWh.If average line loss per unit declines
2% or so, then can just reduce 86.73 hundred million kw/ of loss (i.e. 16 units of pipe of reinforced concrete at Three Gorges Power Station generated energy of a year).Line loss
It is into inverse square in the case of with identical radius and sectional area with low pressure, voltage often lifts two percentage points, line
Damage and decline four percentage points.Therefore quality of voltage is not only improved during low-voltage phenomenon is administered, it is also possible to improve Jing
Ji benefit.Current main-stream solve low voltage method mainly using pressure regulator pressure regulation and reactive-load compensation pressure regulation two in terms of set about, pressure regulation
Device pressure regulation and reactive-load compensation pressure regulation are suitable for the coastal cities with large industrial enterprise, in some western rural areas also much
Without popularization.
In recent years, as China's economy constantly emerges, rural area macroeconomic level is greatly improved, the electricity consumption such as household electrical appliances
Equipment recoverable amount increases year by year, so that electricity for rural use is on the increase.The power consumption of China's rural power grids in 2011 reaches
The 42.2% of national power consumption.Rural power grids circuit is long, and area coverage is also boundless, rate of load condensate it is relatively low and it is idle not
Phenomenon up to standard occurs often.The rural line line loss of such as 10KV is excessive, and during peak, feedline circuit terminal voltage is excessively low.Rural area
The network loss of electrical network is serious, electricity price is unreasonable, power equipment is outmoded, radius of electricity supply length, power supply capacity is weak and low-voltage takes place frequently
Problem, for rural electricity consumption family causes many inconvenience, while also have impact on the development of rural economy.Low-voltage is caused at present
The origin cause of formation mainly have：
(1) power consumption is increased rapidly
In recent years, China's economic development is rapid, improves the standard of living of rural subscribers, and the household electrical appliance of peasant household are also gradually
Increase, the planting industry in rural area and aquaculture are developed rapidly so that electricity for rural use rapid increase so that many transformators in rural power grids
Normal and economical operation requirement is can not meet at all.
(2) line facility situation is poor
First, although the circuit being currently in operation have passed through the upgrading of rural power grids several times, but due to building time it is more early, also
Circuit that is greatly more outmoded, falling behind is present in countryside low-voltage electric distribution network, and with technical merit and construction criteria
To examine the need for electricity that can not all meet current rural subscribers.
Second, radius of electricity supply is excessive.Also there are many deficiencies in the construction of rural power grids, the quantity of such as transformer station is not reaching to
The powering mode at one township, one station, indivedual transformer station's irrational distributions cause the transformer station having pressure of powering excessive, and some power transformations
Stand and do not give full play to its power supply capacity, low-voltage circuit radius of electricity supply severe overweight, even up to former radius of electricity supply
124.95% so that line loss steeply rises.
3rd, the loss of rural power grids is also more serious, causes idle deficiency, has influence on the user of line end, a side
Face reactive power source is not enough, and peasant household's power load is excessive so that idle significantly consume in addition, causes idle in short supply of rural power grids.In agriculture
It is not the presence of dispersion random back-off on the spot in many cases in village's electrical network, many semiworks are only furnished with simple and crude power distribution equipment,
Reactive-load compensation capacitor is configured without at all.Even if there is the also Jing often no normal operations of concentration reactive power compensator.
Power distribution network low-voltage phenomenon is broadly divided into 10KV line ends and 0.4KV distribution lines end.During low-voltage phenomenon
10KV line ends are occurred in often, major technique reason has that radius of electricity supply is long, line voltage distribution is unstable, reactive power flow is excessive,
Main transformer on-load voltage regulation is not actuated, sectional area of wire is not enough etc..The too low main cause of 0.38KV feedline circuit terminal voltages is to supply
Electric radius is long, high side voltage is too low, sectional area of wire is not enough etc..Statistics show, before low-voltage is administered, certain province
There is 525131 family of user of low-voltage, 159,10KV circuits, 7143, platform area in rural power grids.This shows low-voltage phenomenon
It is prevalent in the middle of rural power grids, is badly in need of administering " low-voltage " problem.At present, the voltage dynamic regulation master of 10kV distribution lines
The on-load voltage regulation relied on by main transformer, but the on-load voltage regulating device of main transformer is frequently adjusted and can be caused in shunting switch container
Insulating oil accelerated carbonation, so as to limit the on-load voltage regulation of transformator.ULTC is base by the bus of transformer station
Standard carries out dynamic voltage adjustment, due to for different radius of electricity supplys, payload and conductor cross-section, cannot guarantee that all requirements
Line end voltage can meet standard.
For above reason, and circuit is changed comprehensively currently without ability and several transformer stations are built meet rural power grids
The demand of development.
Accordingly, it would be desirable to a kind of equipment can realize pressure regulation, rural power grids supply line terminal voltage demand is met, it is ensured that voltage
Output can be in the range of defined.
The content of the invention
To achieve these goals, this utility model provides a kind of power distribution network low-voltage governing system, and its objective is can
Voltage change ratio, output burning voltage are automatically adjusted, reaches circuit stable.About the 20% of rated voltage, can be effective
Voltage is adjusted, it is ensured that export in the range of defined in rural power grids supply line terminal voltage.
To achieve these goals, this utility model is implemented according to technical scheme below：The low electricity of described power distribution network
Pressure governing system includes input ammeter, input terminal voltage table, frequency modulator, 3-phase autotransformer, output end voltage table, electricity
Motivation, under-voltage detection and analysis contrast module, manually control coil, regulation switch, Zenith tracking module, described three-phase is certainly
Coupling transformator includes shunting switch, and input terminal voltage table, input ammeter, 3-phase autotransformer are arranged in main circuit,
Main circuit is electrically connected with frequency modulator, and frequency modulator is connected with shunting switch with electronic mechatronics, motor；3-phase autotransformer
Outgoing line side lead control coil, Zenith tracking module are installed, control coil and under-voltage test and analyze contrast module and are electrically connected
Connect, under-voltage detection and analysis contrast module is connected with motor signal, and Zenith tracking module is connected with motor signal；Manually
Adjust switch to be connected with shunting switch.
Described power distribution network low-voltage governing system is installed on the leading-out terminal of main transformer.
Described main transformer is electrically connected with user by power distribution network low-voltage governing system.
The beneficial effects of the utility model：It is of the present utility model to automatically adjust voltage change ratio, output burning voltage, make
Circuit reaches stable.About the 20% of rated voltage, effectively voltage can be adjusted, it is ensured that in rural power grids supply line
Terminal voltage is exported in the range of defined.
Description of the drawings
Fig. 1 is this utility model structural representation；
Fig. 2 is this utility model circuit theory diagrams；
Fig. 3 is that under-voltage tests and analyzes contrast module circuit theory diagrams；
Fig. 4 is Zenith tracking modular circuit schematic diagram.
In figure, 1- main transformers, 2- input ammeters, 3- input terminal voltage tables, 4- frequency modulators, 5- three-phase self coupling transformations
Device, 6- shunting switchs, 7- output end voltage tables, 8- user, 9- motor, 10- under-voltages detection and analysis contrast module, 11- controls
Coil processed, 12- adjust switch, 13- Zenith tracking modules manually.
Specific embodiment
In order that the purpose of this utility model, technical scheme and beneficial effect are more clear below in conjunction with accompanying drawing, to this
The preferred embodiment of utility model is described in detail, to facilitate the technical staff to understand.
As Figure 1-3, this utility model discloses a kind of power distribution network low-voltage governing system, and its technical scheme is：It is described
Power distribution network low-voltage governing system include input ammeter 2, input terminal voltage table 3, frequency modulator 4,3-phase autotransformer
5th, output end voltage table 7, motor 8, under-voltage detection and analysis contrast module 10, manually control coil 11, regulation switch 12, mistake
Voltage detection module 13, described 3-phase autotransformer 5 include shunting switch 6, described power distribution network low-voltage governing system
The leading-out terminal of main transformer 1 is installed on, input terminal voltage table 3, input ammeter 2,3-phase autotransformer 5 are arranged at main electricity
Lu Zhong, the phase voltage value and line current value for occurring side for measuring main transformer 1, main circuit 1 are electrically connected with frequency modulator 4, are used for
Power for frequency modulator 4, frequency modulator 4 is electrically connected with motor 9, frequency modulator 4 is used for the speed for adjusting motor 9, so as to limit electricity
The execution speed of motivation 9, motor 9 are connected with shunting switch 6, regulation of the motor 9 to shunting switch 6, meet three-phase self coupling
5 voltage regulation function of transformator, can automatically adjust voltage change ratio, output burning voltage, reach circuit stable, it is ensured that in rural power grids
Supply line's terminal voltage is exported in the range of defined.
The outgoing line side lead of 3-phase autotransformer 5 installs control coil 11, Zenith tracking module 13, that is, realize to electricity
The collection of pressure, and electric energy, control coil 11 are provided to under-voltage detection and analysis contrast module 10, Zenith tracking module 13 respectively
Electrically connect with under-voltage detection and analysis contrast module 10, under-voltage detection and analysis contrast module 10 is connected with 9 signal of motor, real
The now regulation to the boosting of 3-phase autotransformer 5, Zenith tracking module 10 are connected with 9 signal of motor, are realized to three-phase certainly
The regulation of 5 blood pressure lowering of coupling transformator, is adjusted manually switch 12 and is connected with shunting switch 6, and realization is manually to 5 liters of three line autotransformer
Pressure or the regulation of blood pressure lowering.
The course of work of the present utility model：Utility model works schematic diagram is illustrated in figure 3, control coil 11 provides two
Group out-put supply, one group of 15V power supply export DC source, Jing IC1 (model 7812) voltage stabilizing output by diode D1-D4 rectifications
12V DC sources, work for relay.Another group of 13V power supply Jing D5-D8 rectification exports DC source, Jing R15, R16 partial pressures
The sampled voltage of control circuit is provided afterwards, the reverse input end of voltage comparator ic 3a is delivered to.C1, C2, C3, C6 are rectification circuit
Filter capacitor.IC2 is Three-end voltage stabilizer (model 7809), and it provides the 9V working powers of control circuit, R2, R3, W composition
Bleeder circuit.By the input reference voltage in the same direction of the centre cap extraction voltage comparator IC3a of W.R8, R9 are divider resistance
The reference voltage of IC3b reverse input ends is provided.C5 is anti-interference capacitor.R13 is transistor base current-limiting resistance, R12, D12's
Effect is that the reverse input end voltage that IC3b is made after triode ON is reduced, and stablizes shape to ensure that IC3b working conditions are in
State.Relay J1 is also at stable working condition.The biasing resistor of R4, R5 for IC3a outfans, R10 are IC3b outfans
Biasing resistor, VD1-VD3 are luminous indicating diode.VD1 is that 12V working powers indicate (redness), and VD2 is sampling power supply instruction
(redness), VD3 are that line voltage indicates (green) in relay work under under-voltage (5%) state, and R1, R11, R14 are respectively
The current-limiting resistance of light emitting diode.Fly-wheel diodes of the D11 for relay coil.
It is illustrated in figure 4 Zenith tracking schematic diagram.When there is overvoltage signal to produce, varistor is breakdown, presents
Low resistance is even close to short-circuit condition, and so primary side in current transformer is produced a high current, made by coil mutual inductance
With producing a small current in secondary side, then current signal be changed into voltage signal by precision resistance；This signal input
To after voltage comparator LM393, voltage comparator LM393 output high level, audion are connected to high level, relay J2 are led
Logical, J2-2 normally opened contacts closure, motor realize the reduction regulation of 3-phase autotransformer by shunting switch.
Under-voltage tests and analyzes the operation principle of contrast module circuit, and when main circuit voltage is normal, circuit is in normal
Working condition, at this moment, IC3a reverse input ends voltage is more than homophase input terminal voltage, therefore 13 foot of outfan is electronegative potential.IC3b
1 foot of outfan be also electronegative potential, relay J1 do not work, when main circuit voltage declines 5% (this circuit configuration value), IC3a
Reverse input end voltage be less than homophase input terminal voltage, 13 foot of outfan be high potential, this signal Jing D9, D10, R6 are added to
The in-phase input end of IC3b, makes the homophase input terminal voltage of IC3b more than reverse input end voltage, and 1 foot of IC3b outfans is high electricity
Position, Jing R13 are added to the base stage of audion connects triode ON, relay J1 work, the normally opened contact J1-1 of J1, motor
Regulation tap switch realizes that the boosting to 3-phase autotransformer 5 is adjusted.
When occur motor protection action or motor according to it is dynamic when, realize adjusting manually, as shown in Fig. 2 first by QT to
A left side is beaten, and the voltage of main circuit is understood by observing output end voltage value, when there is overvoltage, adjusts
6P realizes the reduction regulation of 3-phase autotransformer 5 so as to regulation tap switch.When there is low-voltage, hand switch is adjusted
In 4P so as to regulation tap switch, realize that the boosting of 3-phase autotransformer 5 is adjusted.
This utility model is to making analysis below using the technical performance of power distribution network low-voltage governing system：
In the case where being not required to transformation circuit, being not required to newly-built and decoupling platform area, be not required to distribution transforming increase-volume, can be directly effective
Ground solves the problems, such as platform area low-voltage, and is output as sine wave, disturbs without harmonic wave, and delivery efficiency is high, bears Short-time Overload ability by force,
Not only substantial amounts of human and material resources are saved for power supply enterprise, provided the user reliable quality of voltage again, reduce rural power grids and change
The investment made, it is preferable to solving the problems, such as rural LV long distance power delivery, low-voltage effect.Following table is controlled for power distribution network low-voltage
Reason system and the contrast of conventional lift voltage measure
As can be seen from Table 1, equally all it is to improve voltage, installs the expense required for power distribution network low-voltage governing system additional
It is low, and little is affected on customer power supply, boosting is obvious, it may be said that is have very big economic advantages, can save for electric company
More manpower and materials, while standard compliant supply voltage can also be provided, can effectively solving low-voltage problem.
This utility model technical performance Binding experiment to power distribution network low-voltage governing system is illustrated：
Test apparatuses
Power distribution network low-voltage governing system.
Test method
Laboratory installs test → Binding experiment test effect, data analysiss → stage summary achievement and experience → continuation
Experimental verification → deepen continuously and explore and consolidate perfect.
Content of the test
Result of the test
The strict implement of each test event by more than, the low pressure regulator that this project is developed improve circuit and enter
The quality of voltage of family voltage, realizes that the voltage of circuit low-voltage user will increase to 219V- by original 160V-190V scopes
220V, boosted voltage have reached required voltage standard of registering one's residence, and various functions index has reached design requirement, practical
Property is good.
It is of the present utility model to automatically adjust voltage change ratio, output burning voltage, reach circuit stable.In specified electricity
About the 20% of pressure, effectively can be adjusted to voltage, it is ensured that export in defined in rural power grids supply line terminal voltage
In the range of.
Finally illustrate, preferred embodiment above is merely to illustrate the technical solution of the utility model rather than to this practicality
New restriction, although being described in detail to this utility model by above preferred embodiment, this area skill
Art personnel it is to be understood that be variously modified to which in the form and details, without departing from protection model of the present utility model
Enclose.
Claims (3)
1. a kind of power distribution network low-voltage governing system, it is characterised in that：Described power distribution network low-voltage governing system includes input
End ammeter, input terminal voltage table, frequency modulator, 3-phase autotransformer, output end voltage table, motor, under-voltage detection point
Analysis contrast module, manually control coil, regulation switch, Zenith tracking module, described 3-phase autotransformer include tap
Switch, input terminal voltage table, input ammeter, 3-phase autotransformer are arranged in main circuit, and main circuit is electric with frequency modulator
Connection, frequency modulator are connected with shunting switch with electronic mechatronics, motor；The outgoing line side lead of 3-phase autotransformer is installed
Control coil, Zenith tracking module, control coil are electrically connected with under-voltage detection and analysis contrast module, under-voltage detection and analysis
Contrast module is connected with motor signal, and Zenith tracking module is connected with motor signal；Adjust switch manually to open with tap
Close and be connected.
2. a kind of power distribution network low-voltage governing system according to claim 1, it is characterised in that：The low electricity of described power distribution network
Pressure governing system is installed on the leading-out terminal of main transformer.
3. a kind of power distribution network low-voltage governing system according to claim 2, it is characterised in that：Described main transformer leads to
Cross power distribution network low-voltage governing system to electrically connect with user.
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| CN201621147698.0U CN206076958U (en) | 2016-10-21 | 2016-10-21 | A kind of power distribution network low-voltage governing system |
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| CN201621147698.0U CN206076958U (en) | 2016-10-21 | 2016-10-21 | A kind of power distribution network low-voltage governing system |
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| CN206076958U true CN206076958U (en) | 2017-04-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107292442A (en) * | 2017-06-27 | 2017-10-24 | 国网江西省电力公司电力科学研究院 | A kind of 10kV power distribution networks low-voltage plans improvement and appraisal procedure automatically |
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2016
- 2016-10-21 CN CN201621147698.0U patent/CN206076958U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107292442A (en) * | 2017-06-27 | 2017-10-24 | 国网江西省电力公司电力科学研究院 | A kind of 10kV power distribution networks low-voltage plans improvement and appraisal procedure automatically |
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Granted publication date: 20170405 Termination date: 20171021 |