CN110011338A - Tri-phase unbalance factor monitoring device, transformer and low-voltage network system - Google Patents
Tri-phase unbalance factor monitoring device, transformer and low-voltage network system Download PDFInfo
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- CN110011338A CN110011338A CN201910375636.7A CN201910375636A CN110011338A CN 110011338 A CN110011338 A CN 110011338A CN 201910375636 A CN201910375636 A CN 201910375636A CN 110011338 A CN110011338 A CN 110011338A
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- 238000012806 monitoring device Methods 0.000 title claims abstract description 31
- 230000002159 abnormal effect Effects 0.000 claims abstract description 24
- 238000005070 sampling Methods 0.000 claims description 15
- 238000005303 weighing Methods 0.000 claims description 5
- 230000002411 adverse Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 9
- 230000005611 electricity Effects 0.000 description 6
- 238000012545 processing Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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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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- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The embodiment of the present invention is about a kind of tri-phase unbalance factor monitoring device, transformer and low-voltage network system, comprising: sample circuit, for acquiring the voltage signal and/or current signal of each phase of three-phase four-wire system power supply；Control circuit, for receiving the voltage signal and/or current signal of the sample circuit output, the voltage unbalance factor and/or current unbalance factor of each phase are calculated according to the voltage signal and/or current signal, and judge whether the voltage unbalance factor and/or current unbalance factor are abnormal, if then one control signal of output；Executing agency is electrically connected between the three-phase four-wire system power supply and load, for cutting off the connection between the three-phase four-wire system power supply and the load when receiving the control signal.The tri-phase unbalance factor monitoring device can reduce the abnormal adverse effect to low voltage electric network and electric equipment of three characteristics of the middle term degree of unbalancedness, reduce the electric energy loss of route and transformer, improve transformer efficiency.
Description
Technical field
The present embodiments relate to power supply unit technical field more particularly to a kind of tri-phase unbalance factor monitoring device, become
Depressor and low-voltage network system.
Background technique
Low voltage electric network is after transformer pressure-reducing mostly, is three-phase productive power with three-phase four-wire system to customer power supply
With the supply network of single-phase load mixing electricity consumption.When accessing single-phase user, power supply department should balancedly divide single-phase load
It connects on A, B, C three-phase.But in real work and operation, the mark of route, the carelessness for meeting electric personnel are added due to single-phase
The uncontrollable increase-volume of user, the access of great power single phase load and asynchronism of single-phase load electricity consumption etc., all cause three
The imbalance of phase load.
Distribution transformer is Y/Yn0 wiring in low-voltage network, and largely uses the three-phase four-wire system mode of connection, is existed
Many single-phase loads, this is just inevitably present the three-phase imbalance operation of distribution transformer.And if low-voltage network exists
It is run in the larger situation of three-phase load unbalance degree, it will cause adverse effect to low voltage electric network and electrical equipment, such as bring
Harm include at least it is any one of following: increase the electric energy loss of route；Increase the electric energy loss of distribution transformer；Distribution transforming power output
It reduces；Distribution transforming generates zero-sequence current；Influence the safe operation of electrical equipment；Transformer efficiency reduces.Therefore, it is necessary on improving
State one or more problem present in related art scheme.
It should be noted that this section is intended to provide an explanation of the embodiments of the present invention set forth in the claims background or
Context.Description herein recognizes it is the prior art not because not being included in this section.
Summary of the invention
The embodiment of the present invention is designed to provide a kind of tri-phase unbalance factor monitoring device, transformer and low-voltage network
System, and then one or more is asked caused by overcoming the limitation and defect due to the relevant technologies at least to a certain extent
Topic.
According to a first aspect of the embodiments of the present invention, a kind of tri-phase unbalance factor monitoring device is provided, comprising:
Sample circuit, with three-phase four-wire system power electric connection, the voltage for acquiring each phase of three-phase four-wire system power supply is believed
Number and/or current signal；
Control circuit is electrically connected with the sample circuit, for receiving the voltage signal of the sample circuit output
And/or current signal, the voltage unbalance factor and/or electric current injustice of each phase are calculated according to the voltage signal and/or current signal
Weighing apparatus degree, and judge whether the voltage unbalance factor and/or current unbalance factor are abnormal, if then one control signal of output；And
Executing agency is electrically connected to the control circuit, and is electrically connected between the three-phase four-wire system power supply and load,
For cutting off the connection between the three-phase four-wire system power supply and the load when receiving the control signal.
In one embodiment of the invention, the sample circuit includes: current sampling circuit and/or voltage sampling circuit.
In one embodiment of the invention, the executing agency is relay.
In one embodiment of the invention, further includes:
Alert circuit is electrically connected with control circuit, for being reminded when receiving the control signal.
In one embodiment of the invention, the alert circuit includes:
Display circuit is electrically connected with control circuit, for show voltage signal, current signal, non-equilibrium among three phase voltages,
At least one in three-phase current unbalance degree.
In one embodiment of the invention, the also described alert circuit further include: the first indicating circuit, the second indicating circuit and report
At least one in alert circuit.
In one embodiment of the invention, first indicating circuit or the second indicating circuit are by resistance and light emitting diode structure
At.
In one embodiment of the invention, the control circuit includes single-chip microcontroller.
According to a second aspect of the embodiments of the present invention, a kind of transformer is provided, comprising: the three-phase in any of the above-described embodiment
Degree of unbalancedness monitoring device.
A kind of low-voltage network system is additionally provided according to embodiments of the present invention, comprising: three in any of the above-described embodiment
Phase degree of unbalancedness monitoring device
The technical solution that the embodiment of the present invention provides can include the following benefits:
In the embodiment of the present invention, by above-mentioned tri-phase unbalance factor monitoring device, three-phase four-wire system can be acquired in real time
The electric current and/or voltage of each phase of power supply, and it is converted into tri-phase unbalance factor, judge whether tri-phase unbalance factor is abnormal, if then
Cut off the connection between three-phase four-wire system power supply and the load, thus reduce three characteristics of the middle term degree of unbalancedness it is abnormal to low voltage electric network with
The adverse effect of electrical equipment reduces the electric energy loss of route and transformer, improves transformer efficiency.
Detailed description of the invention
The drawings herein are incorporated into the specification and forms part of this specification, and shows the implementation for meeting the disclosure
Example, and together with specification for explaining the principles of this disclosure.It should be evident that the accompanying drawings in the following description is only the disclosure
Some embodiments for those of ordinary skill in the art without creative efforts, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 shows tri-phase unbalance factor monitoring device schematic diagram in exemplary embodiment of the present；
Fig. 2 shows tri-phase unbalance factor monitoring device schematic diagrames in exemplary embodiment of the present；
Fig. 3 shows tri-phase unbalance factor monitoring device schematic diagram in exemplary embodiment of the present；
Fig. 4 shows voltage sampling circuit schematic diagram in exemplary embodiment of the present；
Fig. 5 shows current sampling circuit schematic diagram in exemplary embodiment of the present；
Fig. 6 shows control circuit schematic diagram in exemplary embodiment of the present；
Fig. 7 shows abnormal work indicating circuit schematic diagram in exemplary embodiment of the present；
Fig. 8 shows normal work indicating circuit schematic diagram in exemplary embodiment of the present；
Fig. 9 shows warning circuit schematic diagram in exemplary embodiment of the present.
Specific embodiment
Example embodiment is described more fully with reference to the drawings.However, example embodiment can be with a variety of shapes
Formula is implemented, and is not understood as limited to example set forth herein；On the contrary, thesing embodiments are provided so that the present invention will more
Fully and completely, and by the design of example embodiment comprehensively it is communicated to those skilled in the art.Described feature, knot
Structure or characteristic can be incorporated in any suitable manner in one or more embodiments.
In addition, attached drawing is only the schematic illustrations of the embodiment of the present invention, it is not necessarily drawn to scale.It is identical in figure
Appended drawing reference indicates same or similar part, thus will omit repetition thereof.Some boxes shown in the drawings
Figure is functional entity, not necessarily must be corresponding with physically or logically independent entity.
A kind of tri-phase unbalance factor monitoring device is provided firstly in this example embodiment.Middle institute referring to figs. 1 to Fig. 3
Show, which may include: sample circuit 110, control circuit 100 and executing agency 120.It is described to adopt
Sample circuit 100 is electrically connected with three-phase four-wire system power supply 200, for acquiring the voltage signal of each phase of three-phase four-wire system power supply 200
And/or current signal.The control circuit 100 is electrically connected with the sample circuit 110, for receiving the sample circuit 110
The voltage signal and/or current signal of output, the voltage for calculating each phase according to the voltage signal and/or current signal are uneven
Weighing apparatus degree and/or current unbalance factor, and judge whether the voltage unbalance factor and/or current unbalance factor are abnormal, if then defeated
A control signal out.The executing agency 120 is electrically connected with the control circuit 100, and is electrically connected to the three-phase four-wire system
Between power supply 200 and load 300, for cutting off the three-phase four-wire system power supply 200 and institute when receiving the control signal
State the connection between load 300.
By above-mentioned tri-phase unbalance factor monitoring device, 200 three-phase of three-phase four-wire system power supply on the one hand can be acquired in real time
Electric current and/or voltage, and be converted into tri-phase unbalance factor, judge whether tri-phase unbalance factor abnormal, if then cutting off three-phase
Connection between four-wire system power supply 200 and the load 300, so that it is abnormal to low voltage electric network and electricity to reduce three characteristics of the middle term degree of unbalancedness
The adverse effect of gas equipment reduces the electric energy loss of route and transformer, improves transformer efficiency.
In the following, by referring to figs. 1 to Fig. 9 to each of the above-mentioned tri-phase unbalance factor monitoring device in this example embodiment
Part is described in detail.
As shown in Figure 4, wherein the control circuit 100 is a kind of IC chip, the processing capacity with signal.
It can be general processor, including central processing unit (Central Processing Unit, CPU), network processing unit
(Network Processor, NP) etc..It can also be digital signal processor (DSP), specific integrated circuit (ASIC), ready-made
Programmable gate array (FPGA) either other programmable logic device, discrete gate or transistor logic, discrete hardware group
Part.General processor can be microprocessor, be also possible to any conventional processor etc..In the present embodiment, the control
Circuit 100 includes single-chip microcontroller.Specifically, the control circuit 100 is using technical grade STM32 singlechip chip.The STM32 is mono-
Bigpian chip has multiple pins, corresponding can be electrically connected with sample circuit 110, executing agency 120, alert circuit.
Wherein, three-phase imbalance: referring to that three-phase current (or voltage) amplitude is inconsistent in the power system, and difference in magnitude is super
Cross prescribed limit.Y/Y n0 wiring is all defined in national standard GB50052 " transformer station high-voltage side bus regulation ", " design for power supply and distribution specification "
Distribution transformer run when current in middle wire no more than transformer phase, line current 25%.Generally require power transformer low pressure
The degree of unbalancedness of electric current must not exceed 10%, and the current unbalance factor at low pressure main line and main transformer branch line beginning must not exceed 20%.
Regulation in GB/T15543-2008 " power quality three-phase voltage allows degree of unbalancedness ": electric system points of common connection normal voltage
Degree of unbalancedness permissible value is 2%, must not exceed 4% in short-term, each user non-equilibrium among three phase voltages caused by common node
It must not exceed 1.3%.The voltage and or current that Acquisition Circuit 110 acquires is converted to three-phase by tri-phase unbalance factor formula
Degree of unbalancedness, the formula can refer to the prior art.When tri-phase unbalance factor is more than permissible value, then exception is judged.It controls at this time
Circuit 100 controls executing agency 120 and cuts off three-phase four-wire system power supply 200 and the connection loaded between 300.
In one embodiment of the invention, the sample circuit 110 includes: current sampling circuit 112 and/or voltage sample electricity
Road 111.
Illustratively, as shown in figure 5, the signal input part of voltage sampling circuit 111 be four, and respectively with three-phase and four-line
The A phase, B phase, C phase and neutral conductor N connection of power supply processed, signal output end are four and are electrically connected respectively with control circuit 100.
As shown in fig. 6, the signal input part of current sampling circuit 112 be four, and respectively with the A phase of three-phase four-wire system power supply, B phase, C
Mutually and neutral conductor N connection, signal output end are four and are electrically connected respectively with control circuit 100.
In one embodiment of the invention, the executing agency 120 is relay.Certainly the control of control circuit output can be received
Signal processed, the device for executing the connection between cutting three-phase four-wire system power supply 200 and threephase load 300 are ok, do not do herein
It limits.
Illustratively, the signal input part of the relay be three, and respectively with the output end of the local power supply, institute
State the output port connection of control circuit 100, signal output end be four and respectively with three-phase four-wire system power supply 200 and negative
Carry 300 connections.When receiving a control signal, the connection between three-phase four-wire system power supply 200 and the load 300 is cut off.
In one embodiment of the invention, tri-phase unbalance factor monitoring device further include: alert circuit, with control circuit 100
Electrical connection, for being reminded when receiving the control signal.Setting alert circuit can effectively prompt staff
Reasonably adjust three-phase load, the efficient operation of effective guarantee transformer.
In one embodiment of the invention, the alert circuit includes: display circuit 131, is electrically connected with control circuit 100.
Specifically, an output port with control circuit 100 is connect.For showing that voltage signal, current signal, three-phase voltage are uneven
At least one in weighing apparatus degree, three-phase current unbalance degree.By the display circuit 131, so that staff can get information about
Whether the three-phase four-wire system power supply 200 there is exception, and when occurring abnormal, abnormal concrete condition occurs in display.Work
Making personnel can also be adjusted according to abnormal concrete condition.
In one embodiment of the invention, the alert circuit further include: the first indicating circuit, the second indicating circuit and alarm
At least one in circuit 134, first indicating circuit, the second indicating circuit and warning circuit 134 are electrically connected with control circuit 100
It connects.
Wherein, the first indicating circuit is abnormal work indicating circuit 132, and the second indicating circuit is normal working indicating
133。
Specifically, as shown in fig. 7, abnormal work indicating circuit 132 be include six resistance and six light emitting diodes, it is different
Normal working indicating 132 is connect with control circuit 100, and voltage sampling circuit 111 and current sampling circuit 112 respectively correspond
There are three light emitting diodes.The light emitting diode can indicate the over-voltage or overshoot of 200 three-phase of three-phase four-wire system power supply.Such as Fig. 8 institute
Show, working normally 133 circuits of instruction includes a resistance and a light emitting diode.Control circuit 100 is in voltage sampling circuit
111 and 112 testing result of current sampling circuit be it is normal when control work normally indicating circuit 133 indicator light light, and
When at least one testing result is abnormal in voltage sampling circuit 111 and current sampling circuit 112, at least one sampling electricity is controlled
The indicator light of the corresponding abnormal work indicating circuit 132 in road is lighted.
Illustratively, warning circuit 134 can include but is not limited to audible alarm circuit, optical alarm circuit, sound-light alarm
One of circuit or SMS alarm circuit are a variety of, as long as can be realized alarm effectively to prompt staff.Such as Fig. 9
Shown, in the present embodiment, the warning circuit 134 is buzzer alarm circuit.To avoid in staff's maintenance process
Staff is influenced, can be under the control of control circuit 100, automatic stop alarm after preset duration can also be by manual
Excision alarm.
Illustratively, alert circuit includes display circuit 131, abnormal work indicating circuit 132, works normally indicating circuit
132 and warning circuit 134.When the electric current and/or voltage that sample circuit 110 acquires are abnormal there are one, control circuit 100
The connection between relay disconnection three-phase four-wire system power supply 200 and threephase load 300 is controlled, cutting works normally indicating circuit
132 indicator light, lights the indicator light of corresponding abnormal work indicating circuit 132, and control warning circuit 134 issues alarm signal
Number, and the voltage status for the three-phase four-wire system power supply 200 that will test, current status, non-equilibrium among three phase voltages state, three-phase electricity
Stream degree of unbalancedness state sends the display of display circuit 131 to, and then it is negative effectively to prompt staff to reasonably adjust three-phase
Lotus, the efficient operation of effective guarantee transformer.
In one embodiment of the invention, the tri-phase unbalance factor monitoring device further include: power circuit 140, for
Sample circuit 110, control circuit 100, executing agency 120, alert circuit power supply.
Specifically, the input terminal of the power circuit 140 is two, and it is separately connected appointing for three-phase four-wire system power supply 200
It anticipates a phase, output end is three and is separately connected sample circuit 110, control circuit 100, executing agency 120, alert circuit.
The tri-phase unbalance factor monitoring device provided by above-mentioned each embodiment, can acquire three-phase four-wire system in real time
The electric current and/or voltage of power supply 200, and it is converted into tri-phase unbalance factor, judge whether tri-phase unbalance factor is abnormal, if then cutting
Connection between disconnected three-phase four-wire system power supply 200 and the load 300, so that it is abnormal to low tension to reduce three characteristics of the middle term degree of unbalancedness
The adverse effect of net and electrical equipment reduces the electric energy loss of route and transformer, improves transformer efficiency.
The embodiment of the present invention also provides a kind of transformer, monitors dress including the tri-phase unbalance factor in any of the above-described embodiment
It sets.Previous embodiment is specifically referred to about the tri-phase unbalance factor monitoring device, details are not described herein again.
Further, the embodiment of the present invention also provides a kind of low-voltage network system, including in any of the above-described embodiment
The tri-phase unbalance factor monitoring device.Previous embodiment is specifically referred to about the tri-phase unbalance factor monitoring device, this
Place repeats no more.
The transformer and low-voltage network system that the above embodiment of the present invention provides, are monitored by above-mentioned tri-phase unbalance factor
Device, on the one hand can acquire the electric current and/or voltage of 200 three-phase of three-phase four-wire system power supply in real time, and be converted into three-phase injustice
Whether abnormal weighing apparatus degree judges tri-phase unbalance factor, if then cutting off between three-phase four-wire system power supply 200 and the load 300
Connection reduces route and transformation to reduce the abnormal adverse effect to low voltage electric network and electrical equipment of three characteristics of the middle term degree of unbalancedness
The electric energy loss of device improves transformer efficiency.
It is to be appreciated that term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness in foregoing description
Degree ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " clockwise ",
The orientation or positional relationship of instructions such as " counterclockwise " is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of describing
The embodiment of the present invention and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with
Specific orientation construction and operation, therefore should not be understood as the limitation to the embodiment of the present invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include one or more of the features.In the description of the embodiment of the present invention, the meaning of " plurality " is two or two
More than a, unless otherwise specifically defined.
In embodiments of the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ",
Terms such as " fixations " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be with
It is mechanical connection, is also possible to be electrically connected；It can be directly connected, two can also be can be indirectly connected through an intermediary
The interaction relationship of connection or two elements inside a element.For the ordinary skill in the art, Ke Yigen
The concrete meaning of above-mentioned term in the present invention is understood according to concrete condition.
In embodiments of the present invention unless specifically defined or limited otherwise, fisrt feature second feature "upper" or
"lower" may include that the first and second features directly contact, also may include the first and second features be not direct contact but
Pass through the other characterisation contact between them.Moreover, fisrt feature includes above the second feature " above ", " above " and " above "
Fisrt feature is right above second feature and oblique upper, or is merely representative of first feature horizontal height higher than second feature.First
Feature is directly below and diagonally below the second feature including fisrt feature under the second feature " below ", " below " and " below ", or only
Only indicate that first feature horizontal height is less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
What can be combined in any suitable manner in one or more embodiment or examples.In addition, those skilled in the art can say this
Different embodiments or examples described in bright book are engaged and are combined.
Those skilled in the art after considering the specification and implementing the invention disclosed here, will readily occur to of the invention its
Its embodiment.This application is intended to cover any variations, uses, or adaptations of the invention, these modifications, purposes or
Person's adaptive change follows general principle of the invention and including the undocumented common knowledge in the art of the present invention
Or conventional techniques.The description and examples are only to be considered as illustrative, and true scope and spirit of the invention are by appended
Claim is pointed out.
Claims (10)
1. a kind of tri-phase unbalance factor monitoring device characterized by comprising
Sample circuit, and three-phase four-wire system power electric connection, for acquire each phase of three-phase four-wire system power supply voltage signal and/
Or current signal；
Control circuit is electrically connected with the sample circuit, for receive sample circuit output the voltage signal and/or
Current signal calculates the voltage unbalance factor and/or current unbalance factor of each phase according to the voltage signal and/or current signal,
And judge whether the voltage unbalance factor and/or current unbalance factor are abnormal, if then one control signal of output；And
Executing agency is electrically connected to the control circuit, and is electrically connected between the three-phase four-wire system power supply and load, is used for
When receiving the control signal, the connection between the three-phase four-wire system power supply and the load is cut off.
2. tri-phase unbalance factor monitoring device according to claim 1, which is characterized in that the sample circuit includes electric current
Sample circuit and/or voltage sampling circuit.
3. tri-phase unbalance factor monitoring device according to claim 1, which is characterized in that the executing agency is relay
Device.
4. tri-phase unbalance factor monitoring device according to claim 1, which is characterized in that further include:
Alert circuit is electrically connected with control circuit, for being reminded when receiving the control signal.
5. tri-phase unbalance factor monitoring device according to claim 4, which is characterized in that the alert circuit includes:
Display circuit is electrically connected with control circuit, for showing voltage signal, current signal, non-equilibrium among three phase voltages, three-phase
At least one in current unbalance factor.
6. tri-phase unbalance factor monitoring device according to claim 5, which is characterized in that the alert circuit further includes
At least one in one indicating circuit, the second indicating circuit and warning circuit.
7. tri-phase unbalance factor monitoring device according to claim 6, which is characterized in that first indicating circuit or
Two indicating circuits are made of resistance and light emitting diode.
8. tri-phase unbalance factor monitoring device according to claims 1 to 7, which is characterized in that the control circuit includes
Single-chip microcontroller.
9. a kind of transformer, which is characterized in that monitored including the described in any item tri-phase unbalance factors of the claims 1~8
Device.
10. a kind of low-voltage network system, which is characterized in that uneven including the described in any item three-phases of the claims 1~8
Weighing apparatus degree monitoring device.
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| CN201910375636.7A CN110011338A (en) | 2019-05-07 | 2019-05-07 | Tri-phase unbalance factor monitoring device, transformer and low-voltage network system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910375636.7A CN110011338A (en) | 2019-05-07 | 2019-05-07 | Tri-phase unbalance factor monitoring device, transformer and low-voltage network system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112798877A (en) * | 2020-12-29 | 2021-05-14 | 广东电网有限责任公司 | Three-phase current unbalance warning device |
| CN112952779A (en) * | 2021-03-29 | 2021-06-11 | 广东电网有限责任公司 | Three-phase load unbalance protection control device and method |
| CN115622090A (en) * | 2022-10-27 | 2023-01-17 | 伊犁职业技术学院 | Three-phase load unbalance degree treatment method and device and transformer |
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