CN104362921B - Control circuit of on-load tap changing transformer - Google Patents
Control circuit of on-load tap changing transformer Download PDFInfo
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- CN104362921B CN104362921B CN201410667544.3A CN201410667544A CN104362921B CN 104362921 B CN104362921 B CN 104362921B CN 201410667544 A CN201410667544 A CN 201410667544A CN 104362921 B CN104362921 B CN 104362921B
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- 238000005070 sampling Methods 0.000 claims abstract description 17
- 238000001914 filtration Methods 0.000 claims description 15
- 230000002457 bidirectional effect Effects 0.000 claims description 10
- 230000005611 electricity Effects 0.000 claims description 10
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 8
- 229910052710 silicon Inorganic materials 0.000 claims description 8
- 239000010703 silicon Substances 0.000 claims description 8
- 230000000087 stabilizing effect Effects 0.000 claims description 4
- 230000000052 comparative effect Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 230000006698 induction Effects 0.000 claims description 2
- 230000033228 biological regulation Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- 230000001276 controlling effect Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
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Abstract
The invention discloses a control circuit of an on-load tap changing transformer. The control circuit comprises a voltage sampling circuit, a single-chip microcomputer circuit and a motor power circuit. The voltage sampling circuit is connected to any phase of the low-voltage side of the transformer, and voltages of the low-voltage side of the transformer are detected and converted into low direct-current voltages. A voltage comparison module is arranged in the single-chip microcomputer circuit, the single-chip microcomputer circuit converts the low direct-current voltages detected by the voltage sampling circuit into alternating-current voltages expressed by digital signals, the voltage comparison module compares the alternating-current voltages with threshold voltages and outputs control signals to the motor power circuit according to a comparison result, a motor forward and reverse rotation control module is arranged in the motor power circuit, and if the alternating-current voltages are larger than the upper limit threshold voltages, a motor is controlled to rotate forwardly. If the alternating-current voltages are smaller than the lower limit threshold voltages, the motor is controlled to rotate reversely. The function of automatically controlling an on-load tap changing switch to adjust a tap is achieved.
Description
Technical field
The present invention relates to electrical network automatic control technology is and in particular to a kind of ULTC control circuit.
Background technology
In rural area, public change is also used extensively by common transformer at present, runs into load and become in summer with winter or operation
When changing larger, all using after manually being had a power failure to scene, adjustment load tap changer raises completing transformer prompt drop, speed liter
When lower.
So there are a lot of problems, for example, increase power supply enterprise's workload；Job safety risk during pressure regulation；And find with
Time difference between pressure regulation brings supply voltage Quality Down, and user's complaint is many；Pressure regulation position is only Experiences, difficult control.
Content of the invention
The technical problem to be solved is exactly to provide a kind of ULTC control circuit, solves rural area public
Become the problem of ULTC automatic Regulation.
For solving above-mentioned technical problem, the present invention adopts the following technical scheme that a kind of ULTC control circuit,
On the transformer motor is installed, described control circuit includes dc source, voltage sampling circuit, single chip circuit, motor electricity
Source circuit；Described dc source accesses the arbitrary phase of step down side as the power supply of control circuit, described voltage sampling circuit
On, detection step down side voltage is simultaneously converted to low-voltage dc voltage；It is provided with voltage comparison module in described single chip circuit,
The low-voltage dc voltage that voltage sampling circuit detects is converted into the alternating voltage that data signal represents by described single chip circuit,
This alternating voltage and threshold voltage are compared and according to comparative result output control signal to electricity described voltage comparison module
Dynamo-electric source circuit, is provided with motor positive and inverse control module in described motor power circuit, if this alternating voltage is more than on threshold values
Voltage limit, controlled motor rotates forward；If this alternating voltage is less than lower threshold voltage, controlled motor inverts.
Preferably, described dc source includes power transformer, current rectifying and wave filtering circuit, direct current regulation circuit, described power supply
Transformer will exchange 220v step-down, and rectified filter circuit rectifying and wave-filtering is direct current, and direct current regulation circuit is by direct current voltage stabilizing
For 5v.
Preferably, described voltage sampling circuit includes voltage transformer and current rectifying and wave filtering circuit, and described voltage transformer will
One phase voltage isolated buck of transformer is that rectified filter circuit rectifying and wave-filtering is low-voltage dc voltage to low-voltage ac voltage again.
Preferably, described motor positive and inverse control module includes the current-limiting resistance being sequentially connected, controllable silicon optocoupler, two-way can
Control silicon.
Preferably, described control circuit also includes gear control circuit, and described gear control circuit is provided with least two tune
The gear contact of whole transformer voltage, described gear contact is closed by transformer gear switch control rule.
The invention has the advantage that after being mounted with electric motor type on-load voltage regulating switch on the public change in rural area transformer, using this
The ULTC control circuit of invention, can enter to transformer according to the voltage that step down side selects any phase
Row Automatic Regulation Control, meets super upper limit threshold voltage controlled motor and rotates forward, control motor reversal less than during lower limit threshold voltage, reach
To the effect automatically controlling on-load voltage regulating switch adjustment tap.
Brief description
The invention will be further described with reference to the accompanying drawings and detailed description:
Fig. 1 is the circuit theory diagrams of the present invention；
Fig. 2 is DC power supply circuit schematic diagram；
Fig. 3 is voltage sampling circuit schematic diagram；
Fig. 4 is single chip machine controlling circuit schematic diagram；
Fig. 5 is motor power circuit schematic diagram；
Fig. 6 is gear control circuit schematic diagram；
Fig. 7 is lcd liquid crystal display circuit theory diagrams；
Fig. 8 is keyboard circuit schematic diagram.
Specific embodiment
Illustrate the present invention with reference to Fig. 1 to Fig. 8.
A kind of ULTC control circuit, is provided with motor on the transformer, and described control circuit includes direct current
Power supply, voltage sampling circuit, single chip circuit, motor power circuit；
Described dc source accesses the arbitrary phase of step down side as the power supply of control circuit, described voltage sampling circuit
On, detection step down side voltage is simultaneously converted to low-voltage dc voltage；It is provided with voltage comparison module in described single chip circuit,
The low-voltage dc voltage that voltage sampling circuit detects is converted into the alternating voltage that data signal represents by described single chip circuit,
This alternating voltage and threshold voltage are compared and according to comparative result output control signal to electricity described voltage comparison module
Dynamo-electric source circuit, is provided with motor positive and inverse control module in described motor power circuit, if this alternating voltage is more than on threshold values
Voltage limit, controlled motor rotates forward；If this alternating voltage is less than lower threshold voltage, controlled motor inverts.
As shown in Fig. 2 described dc source includes power transformer, current rectifying and wave filtering circuit, direct current regulation circuit, described electricity
Source transformer will exchange 220v step-down, and rectified filter circuit rectifying and wave-filtering is direct current, and direct current regulation circuit is steady by direct current
Press as 5v.Specifically, 220 step-downs will be exchanged using power transformer t4, rectified bridge bg, electric capacity c7 rectifying and wave-filtering are direct current
Electricity, direct current voltage stabilizing is used for each circuit by three terminal regulator g2 electric capacity c8 for 5v.
As shown in figure 3, described voltage sampling circuit includes voltage transformer and current rectifying and wave filtering circuit, described voltage transformer
One phase voltage isolated buck of transformer is that rectified filter circuit rectifying and wave-filtering is low-voltage DC to low-voltage ac voltage again
Pressure.Specifically, step down side a, b, c three-phase select any phase voltage access voltage sampling circuit through mutual induction of voltage
Device t3, then by isolated buck be low-voltage ac voltage through diode d1, electric capacity c3, resistance r10 rectifying and wave-filtering be direct current
Pressure vac, DC voltage vac are proportional to transformer output voltage.
Described motor positive and inverse control module includes the current-limiting resistance being sequentially connected, controllable silicon optocoupler, bidirectional triode thyristor.Institute
State control circuit and also include gear control circuit, described gear control circuit is provided with the gear of at least two adjustment transformer voltages
Contact, described gear contact is closed by transformer gear switch control rule.
DC voltage vac sends into the 8th pin of single chip machine controlling circuit single-chip microcomputer u2.Analog-digital converter through u2 will be simulated directly
Stream voltage conversion becomes the alternating voltage that data signal represents, compares with internal adjustment threshold value, above rations the power supply when alternating voltage is more than
During pressure,
To motor power circuit 4, through resistance r14 current limliting, controllable silicon optocoupler q1 leads 12nd pin output high level of single-chip microcomputer
Logical control bidirectional triode thyristor g1 conducting, motor rotates forward；If when alternating voltage is less than lower voltage limit, when 13 pin of single-chip microcomputer u2
During output high level, through resistance r15 current limliting, controllable silicon optocoupler q2 conducting controls bidirectional triode thyristor g2 conducting, motor reversal；Resistance
R17, electric capacity c5, piezo-resistance rv1 constitute rotating forward buffer circuit protection bidirectional triode thyristor gs1；Resistance r18, electric capacity c6, pressure-sensitive electricity
Resistance rv2 constitutes reversion buffer circuit protection bidirectional triode thyristor gs2.
The gear contact that described gear control circuit is provided with least two adjustment transformer voltages is dw1, dw2, dw3, when
When transformer voltage adjustment is on certain shelves, corresponding gear junction closure, corresponding optocoupler conducting, this gear control circuit and single-chip microcomputer
The single-chip microcomputer i/o mouth of control circuit connects.
Additionally, above-mentioned ULTC control circuit is additionally provided with lcd display screen circuit and keyboard circuit, single-chip microcomputer
I/o mouth detects corresponding gear junction closure, that is, during gear change, controls lcd display screen to be shown, that is, shows specific shelves
Position, keyboard circuit is connected with the i/o mouth of single-chip microcomputer u2, for inputting threshold values upper and lower limit voltage, and transmits to lcd display screen electricity
Road shows this upper and lower limit voltage.
Claims (1)
1. a kind of ULTC control circuit, on the transformer motor is installed it is characterised in that: described control circuit
Including dc source, voltage sampling circuit, single chip circuit, motor power circuit；Described dc source is as control circuit
Power supply, described voltage sampling circuit accesses in the arbitrary phase of step down side, and detection step down side voltage is simultaneously converted to low
Pressure DC voltage；It is provided with voltage comparison module, voltage sampling circuit is detected by described single chip circuit in described single chip circuit
To low-voltage dc voltage be converted into the alternating voltage that data signal represents, described voltage comparison module is by this alternating voltage and valve
Threshold voltage is compared and according to comparative result output control signal to motor power circuit, is provided with described motor power circuit
Motor positive and inverse control module, if this alternating voltage is more than threshold values upper voltage limit, controlled motor rotates forward；If this alternating voltage
Less than lower threshold voltage, controlled motor inverts, and it is steady that described dc source includes power transformer, current rectifying and wave filtering circuit, direct current
Volt circuit, described power transformer will exchange 220v step-down, and rectified filter circuit rectifying and wave-filtering is direct current, DC voltage-stabilizing electricity
Direct current voltage stabilizing is 5v by road, and described voltage sampling circuit includes voltage transformer and current rectifying and wave filtering circuit, described mutual induction of voltage
One phase voltage isolated buck of transformer is that rectified filter circuit rectifying and wave-filtering is low-voltage direct to low-voltage ac voltage again by device
Voltage, described motor positive and inverse control module includes the current-limiting resistance being sequentially connected, and controllable silicon optocoupler, bidirectional triode thyristor are described
Control circuit also includes gear control circuit, and the gear that described gear control circuit is provided with least two adjustment transformer voltages connects
Point, described gear contact is closed by transformer gear switch control rule；220 step-downs will be exchanged using power transformer t4, rectified
Bridge bg, electric capacity c7 rectifying and wave-filtering are direct current, and direct current voltage stabilizing is used for each circuit by three terminal regulator g2 electric capacity c8 for 5v；Single
To motor power circuit, through resistance r14 current limliting, controllable silicon optocoupler q1 conducting controls bidirectional triode thyristor to piece machine circuit output high level
Gs1 turns on, and motor rotates forward；If when alternating voltage is less than lower threshold voltage, when the high electricity of 13 pin outputs of single chip circuit
At ordinary times, through resistance r15 current limliting, controllable silicon optocoupler q2 conducting controls bidirectional triode thyristor gs2 conducting, motor reversal；Resistance r17, electricity
Hold c5, piezo-resistance rv1 constitutes rotating forward buffer circuit protection bidirectional triode thyristor gs1；Resistance r18, electric capacity c6, piezo-resistance rv2
Constitute reversion buffer circuit protection bidirectional triode thyristor gs2, be additionally provided with lcd display screen circuit and keyboard circuit, single chip circuit i/o
Mouth detects corresponding gear junction closure, controls lcd display screen to show the i/ of specific gear, keyboard circuit and single chip circuit
O mouth connects, and for inputting threshold values upper and lower limit voltage, and transmits and shows this threshold values upper and lower limit voltage to lcd display screen circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410667544.3A CN104362921B (en) | 2014-11-20 | 2014-11-20 | Control circuit of on-load tap changing transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410667544.3A CN104362921B (en) | 2014-11-20 | 2014-11-20 | Control circuit of on-load tap changing transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104362921A CN104362921A (en) | 2015-02-18 |
| CN104362921B true CN104362921B (en) | 2017-01-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410667544.3A Active CN104362921B (en) | 2014-11-20 | 2014-11-20 | Control circuit of on-load tap changing transformer |
Country Status (1)
| Country | Link |
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| CN (1) | CN104362921B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110703086B (en) * | 2019-11-12 | 2021-08-17 | 国网河南省电力公司南阳供电公司 | Computer readable medium storing failure detection program |
| CN111969611A (en) * | 2020-08-07 | 2020-11-20 | 合肥众甫工业技术有限公司 | Transformer on-load automatic voltage regulation driving and controlling system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202617051U (en) * | 2012-05-29 | 2012-12-19 | 厦门金欣荣电子科技有限公司 | Improved three-phase motor positive and negative rotation controller |
| CN202940592U (en) * | 2012-10-22 | 2013-05-15 | 福建阳谷智能技术有限公司 | Self-adaptive medium voltage-adjusting/stabilizing system matched with intelligent handheld terminal |
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- 2014-11-20 CN CN201410667544.3A patent/CN104362921B/en active Active
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| Publication number | Publication date |
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| CN104362921A (en) | 2015-02-18 |
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Effective date of registration: 20170825 Address after: 100045 West Chang'an Avenue, Beijing, No. 86, No. Co-patentee after: Huzhou Power Supply Company of State Grid Zhejiang Electric Power Company Patentee after: State Grid Corporation of China Co-patentee after: State net Zhejiang Deqing County electric company Co-patentee after: Deqing Shin Electric Power Design Co., Ltd. Address before: 100045 West Chang'an Avenue, Beijing, No. 86, No. Co-patentee before: Huzhou Power Supply Company of State Grid Zhejiang Electric Power Company Patentee before: State Grid Corporation of China Co-patentee before: State net Zhejiang Deqing County electric company |