CN109802395A - A kind of guard method based on distribution transformer automatic Regulation - Google Patents
A kind of guard method based on distribution transformer automatic Regulation Download PDFInfo
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- CN109802395A CN109802395A CN201711142246.2A CN201711142246A CN109802395A CN 109802395 A CN109802395 A CN 109802395A CN 201711142246 A CN201711142246 A CN 201711142246A CN 109802395 A CN109802395 A CN 109802395A
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Abstract
The present invention discloses a kind of guard method based on distribution transformer automatic Regulation, and the technical scheme comprises the following steps: (1) voltage-regulating system uses full power electronic devices, and voltage-regulating system includes System of voltage acquisition, display system and single-chip computer control system；(2) solid-state relay acts on load tap changer, changes on-off, the connection type of tap switch and adjusts Circuit Fault on Secondary Transformer voltage；(3) vacuum A. C. contactor seals in high pressure side loop；(4) secondary side voltage is acquired, changes virtual voltage virtual value into, single-chip microcontroller judges that voltage lacks；(5) SCM system is control core, controls solid-state relay, change display content；(6) display system shows Circuit Fault on Secondary Transformer voltage, transformer work at present gear, system time etc..Control core of the invention is single-chip microcontroller, controls the automation movement of voltage-regulating system, and entire pressure regulation process do not need artificially to intervene, realize distribution transformer without arc, quick, steady pressure regulation.
Description
Technical field
The present invention relates to a kind of guard method based on distribution transformer automatic Regulation, belong to transmission & distribution electrical domain and automatic
Change control field.
Background technique
Domestic most of distribution transformers used at present do not have automatic voltage regulation function.Using the distribution of No-load changer mode
Transformer, when overtension or it is too low when, it is necessary to it is artificial have a power failure after, the tap of transformer is manually changed, after changing tap
Its contact resistance must be measured.So the load tap changer of actual motion is seldom constant, so that 380/220V network voltage is non-
It is often unstable.The transformer on-load voltage regulating tap switch that traditional mechanically and electrically motivation structure combines, high failure rate, movement speed
Slowly, maintenance is inconvenient, the easy ablation contact of electric arc generated during pressure regulation, and causes oily pollution, seriously affects on-load voltage regulation change
The performance of depressor function.It is contactless based on electronic power switch with the continuous development and maturation of power electronic technique
Formula loaded automatic voltage-regulating switch is known as the mainstream of research.
It is proposed at present based on the automatic regulating voltage method of power electronics also in conceptual phase, power electronic devices is in transformation
Device combined floodgate moment unbearable 10kV high pressure, and after power electronic devices damage, guarantee transformation without subsequent guarantee circuit
Device continues to run.Transformer is once out of service, and power grid distribution personnel will bear huge operating pressure.The present invention provides function
Printing method is to seal in a protection circuit at high voltage side of transformer tap switch, which closes in Transformer Close moment
It closes, being connected in parallel on the voltage that the solid-state relay both ends at vacuum contactor both ends are born can be decreased within the scope of safe voltage.When
Solid-state relay damage, vacuum contactor can be closed automatically, assist solid-state relay and voltage-regulating system out of service.
Summary of the invention
Aiming at the problem that power electronics automatic Regulation in background technique, the present invention proposes a kind of in Transformer Close moment guarantor
It protects the method for solid-state relay and continues to guarantee the method that transformer operates normally when solid-state relay is out of service.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of guard method based on distribution transformer automatic Regulation, comprising the following steps:
(1) the used element of the voltage-regulating system of the present apparatus be full power electronic devices, main element include 3 groups totally 18 solid-states after
Electric appliance and 10kV vacuum A. C. contactor, voltage-regulating system mainly include System of voltage acquisition, LCD display system and STM32 monolithic
Machine control system；
(2) solid-state relay acts at load tap changer, changes on-off side according to the control signal that voltage-regulating system is issued
Formula, to change the connection type at tap switch, to achieve the purpose that adjust Circuit Fault on Secondary Transformer voltage；
(3) 10kV vacuum A. C. contactor can all replace solid-state in Transformer Close or when for solid-state relay damage
Relay seals in high pressure side loop, guarantees the normal operation of transformer；
(4) System of voltage acquisition acquires Circuit Fault on Secondary Transformer voltage, and is converted into reality by filtering transformation and Fourier transformation
Voltage effective value, STM32 single-chip microcontroller judge whether transformer voltage missing occurs according to this voltage effective value；
(5) STM32 SCM system is the control core of voltage-regulating system, and main task is that control solid-state is issued according to judging result
The order of relay, and change LCD shows content in time；
(6) LCD display system mainly shows Circuit Fault on Secondary Transformer voltage, transformer work at present gear, system time etc..
The further improvement of above-mentioned technical proposal is: the element of the step (1) is full power electronic devices, and there is no pass
The mechanical organ of system.
The further improvement of above-mentioned technical proposal is: the solid-state relay of the step (2) is only after Transformer Close
And it works when no breakdown.
The further improvement of above-mentioned technical proposal is: the 10kV vacuum A. C. contactor of the step (3) can close a floodgate
When avoid solid-state relay bear 10kV high pressure, can be continued when out of service with voltage-regulating system guarantee transformer normal operation.
The beneficial effects of the present invention are:
This method replaces the pressure regulation of traditional mechanical load ratio bridging switch using full power electronic devices, by acquiring in real time
It is serious uneven or solid to judge whether secondary side voltage voltage phase shortage, voltage occurs for distribution transformer secondary side output voltage
The case where state relay damaged, however, it is determined that distribution transformer secondary side voltage is abnormal, and voltage-regulating system device will control 10kV
Vacuum A. C. contactor closure, then the disconnection of solid-state relay is controlled, so that distribution transformer is able to maintain power supply.Control of the invention
Core processed is STM32, F106, ZET6 single-chip microcontroller, controls the automation movement of voltage-regulating system, and entire pressure regulation process does not need artificially
Ground intervention, realize distribution transformer without arc, quick, steady pressure regulation.
Detailed description of the invention
The present invention will be further explained below with reference to the attached drawings.
Fig. 1 is system wiring figure at sub-connecting switch of transformer of the invention.
Fig. 2 is 10kV vacuum contactor investment protection flow chart.
Fig. 3 is the voltage pattern that system is switched to when 10kV vacuum contactor works by 4 grades.
Fig. 4 is the circulation figure for the transient process that system is switched to 10kV vacuum contactor by 4 grades.
Fig. 5 is stream contactor drive circuit.
Specific embodiment
Embodiment
A kind of guard method based on distribution transformer automatic Regulation of the present embodiment, wherein voltage-regulating system tap switch connects
Line mode is as shown in Figure 1, the ABC three-phase mode of connection is consistent.When distribution transformer high-pressure side electrification, due to A.C. contactor K1
Main contacts be that normally closed node, the actuation coil of 10kV vacuum contactor and transformer high-voltage winding W3 and W4 composition are closed back
The voltage on road, the note both ends high-voltage winding W3 and W4 is U, then its calculated value is as follows.
As shown in Figure 1, voltage U passes through branch pressure voltage RfAfter partial pressure, the 220V actuation coil of 10kV vacuum contactor can be obtained
Control voltage.After vacuum contactor closure, transformer is worked normally, and voltage control system powers on.At this point, control system passes through
Circuit Fault on Secondary Transformer voltage is acquired, after judging that Circuit Fault on Secondary Transformer voltage output is normal, voltage control system issues control signal
Transition branch SCR is connected, is disconnected in control A.C. contactor K1,10kV vacuum A. C. contactor is out of service.Then it controls
SCR3 conducting, transition SCR shutdown.Entire start-up course is fully completed, and voltage-regulating system works normally.
When voltage-regulating system operates normally, voltage-regulating system monitors distribution transformer secondary side voltage automatically.As shown in Fig. 2,
Its protect control flow be
(1) frequency acquisition of system is set, distribution transformer secondary side voltage Ua, Ub, Uc are acquired.
(2) by Ua, Ub, Uc compared with protection seting value Uz,If a wherein phase voltage U < UzWhen, voltage-regulating system control is excessive
Then the conducting of SCR solid-state relay triggers work at present branch and disconnects.
(3) by the delay time t of adjusting1Afterwards, control A.C. contactor K1 closure, 10kV A.C. contactor investment fortune
Row.
(4) by the delay time t of adjusting2 Afterwards, excessive SCR is controlled to disconnect.Control system goes out to work, and transformer is still
It can work normally.
Transformer is burnt when closing a floodgate in order to avoid the high pressure of high-pressure side 10kV is applied directly to solid-state relay both ends
It ruins, solid-state relay output end need to be shorted, solid-state relay can be shorted with vacuum contactor.Three-phase ac contactor drives
Dynamic circuit diagram such as Fig. 3 shows.
The three-pole AC contactor that the A.C. contactor that the present apparatus selects produces for Schneider, model LC1E2501M5N,
Control coil voltage is AC220V, and main contact rated current is 25A.Since contactor control voltage is AC 220V, Ke Yiyong
Alternating current is switched as source driving signal, common relay, and relay uses the JS1-12V-F of Mitsubishi production, control electricity
Pressure is DC12V.Its circuit diagram such as Fig. 3 shows that control signal is after 74HC245 buffering and triode S8850 driving, by light
Coupling TLP521-1 triggering, optocoupler outlet side, which will be connected so that the DC voltage of+12V is added on relay coil OUT1A, allows it to touch
Control A.C. contactor is removed in point OUT1B movement.
Using 10kV step-up transformer, as analog power, pressure regulator mould is added in step-up transformer low voltage side in simulated experiment
Quasi- grid voltage change, transformer noload losses 0.3575kW consumption, no-load loss 4.3063kW, no-load current 0.17%, impedance electricity
Press percentage 3.84%.Start-up resistor and transition resistance are 50 Europe.Regulator output voltage, voltage-regulating system are constantly adjusted in experiment
Self-test transformer voltage makes corresponding adjustment.Fig. 4 and Fig. 5 is the electricity for being adjusted to vacuum contactor branch in experiment by 4 grades
Corrugating and circulation waveform.
By Fig. 4 and Fig. 5 it is found that even if damage that voltage-regulating system may be because solid-state relay or voltage-regulating system are due to list
When the problems such as program fleet of piece machine causes system cisco unity malfunction, starting mentioned by this paper and protection branch still can
Enough guarantee that transformer can normally work.
The present invention is not limited to the above embodiment the specific technical solution, and in addition to the implementation, the present invention may be used also
To there is other embodiments.It is all using equivalent replacement formed technical solution, be the present invention claims protection scope.
Claims (4)
1. a kind of guard method based on distribution transformer automatic Regulation, it is characterised in that: the following steps are included:
(1) the used element of the voltage-regulating system of the present apparatus be full power electronic devices, main element include 3 groups totally 18 solid-states after
Electric appliance and 10kV vacuum A. C. contactor, voltage-regulating system mainly include System of voltage acquisition, LCD display system and STM32 monolithic
Machine control system；
(2) solid-state relay acts at load tap changer, changes on-off side according to the control signal that voltage-regulating system is issued
Formula, to change the connection type at tap switch, to achieve the purpose that adjust Circuit Fault on Secondary Transformer voltage；
(3) 10kV vacuum A. C. contactor can all replace solid-state in Transformer Close or when for solid-state relay damage
Relay seals in high pressure side loop, guarantees the normal operation of transformer；
(4) System of voltage acquisition acquires Circuit Fault on Secondary Transformer voltage, and is converted into reality by filtering transformation and Fourier transformation
Voltage effective value, STM32 single-chip microcontroller judge whether transformer voltage missing occurs according to this voltage effective value；
(5) STM32 SCM system is the control core of voltage-regulating system, and main task is that control solid-state is issued according to judging result
The order of relay, and change LCD shows content in time；
(6) LCD display system mainly shows Circuit Fault on Secondary Transformer voltage, transformer work at present gear, system time etc..
2. a kind of guard method based on distribution transformer automatic Regulation according to claim 1, it is characterised in that: described
The element of step (1) is full power electronic devices, and there is no traditional mechanical organs.
3. a kind of guard method based on distribution transformer automatic Regulation according to claim 1, it is characterised in that: described
The solid-state relay of step (2) only works after Transformer Close and when no breakdown.
4. a kind of guard method based on distribution transformer automatic Regulation according to claim 1, it is characterised in that: described
The 10kV vacuum A. C. contactor of step (3) can avoid solid-state relay from bearing 10kV high pressure when closing a floodgate, can be with pressure regulation system
Continue the normal operation of guarantee transformer when uniting out of service.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711142246.2A CN109802395A (en) | 2017-11-17 | 2017-11-17 | A kind of guard method based on distribution transformer automatic Regulation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711142246.2A CN109802395A (en) | 2017-11-17 | 2017-11-17 | A kind of guard method based on distribution transformer automatic Regulation |
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| CN109802395A true CN109802395A (en) | 2019-05-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111460750A (en) * | 2019-12-24 | 2020-07-28 | 华能龙开口水电有限公司 | Automatic generating system and method for protection setting values of generator and transformer |
-
2017
- 2017-11-17 CN CN201711142246.2A patent/CN109802395A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111460750A (en) * | 2019-12-24 | 2020-07-28 | 华能龙开口水电有限公司 | Automatic generating system and method for protection setting values of generator and transformer |
| CN111460750B (en) * | 2019-12-24 | 2023-06-13 | 华能龙开口水电有限公司 | Automatic generation system and method for protection setting values of generator and transformer |
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