CN102299514A - Automatic switching type transformer operation control method for inhibiting magnetizing inrush current - Google Patents
Automatic switching type transformer operation control method for inhibiting magnetizing inrush current Download PDFInfo
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- CN102299514A CN102299514A CN2011102398857A CN201110239885A CN102299514A CN 102299514 A CN102299514 A CN 102299514A CN 2011102398857 A CN2011102398857 A CN 2011102398857A CN 201110239885 A CN201110239885 A CN 201110239885A CN 102299514 A CN102299514 A CN 102299514A
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Abstract
The invention relates to an automatic switching type transformer operation control method for inhibiting magnetizing inrush current, which belongs to the technical field of transformer equipment protection and operation control. An operation protection effect can be realized on the transformer in an electric power transmission system, the mutual counterbalance of bias magnet and rest magnet is realized through controlling the on-off voltage phase angle of a circuit breaker of the electric power transmission system, the idle load magnetizing inrush current of a transformer is inhibited, and in addition, the automatic switching is realized. A feedback system is adopted for enhancing the control precision and the reliability of the electric power transmission system so that the electric power transmission system realizes the automatic tracking and adapts to the on-off time change caused by environment change or aging of the circuit breaker. The general control process is scientific and reasonable, the technical lines are simple, the hardware and software technology is mature, the operation and the use are safe, the control performance is reliable, the investment is little, the operation cost is low, and the popularization and the application are convenient.
Description
Technical field:
The invention belongs to transformer equipment protection and operation control technology field, relate to a kind of transformer progress control method that economical operation automatic switching formula suppresses magnetizing inrush current that has, the transformer in can transporting electric power plays the running protection effect.
Background technology:
At present, the general transformer backup protection measure and control device of Shi Yonging, its defencive function comprises that mainly three sections specified times press off lock (direction) overcurrent protection again, three sections (direction) zero-sequence current protections, gap zero-sequenceprotection, zero-sequence voltage protection, overload protection (on-load voltage regulation, ventilating starts), composite voltage, the PT break alarm, having liquid crystal display function and normal information and operation all can finish by keyboard and liquid crystal display, realize distant place communication by field-bus interface and automated system, directly drive circuit breaker tripping coil and the breaker tripping and closing operation that realizes circuit breaker by an outer pulse, has anti-jump loop, control circuit breaker deciliter function, but on-line tuning outlet matrix; Its observing and controlling major function comprises that 12 tunnel remote signalling open into collection, device remote signalling displacement, accident remote signalling; Normal breaker remote branch, closing operation; Analog quantitys such as telemetry-acquisition amount and calculating: P, Q, I (IA, IC, I2, Ia, Ib, Ic, I0, I0s), U (UA, UB, UC, UAB, UBC, UCA, U1, U2), U0, F, COS Ф; Incident SOE record; Prior art does not possess the ability that suppresses unloaded switching magnetizing inrush current when the control circuit-breaker switching on-off; Simultaneously, can not carry out the automatic switching of transformer based on the principle of transformer economic operation; When power transformer drops into electrical network at idle-loaded switching-on, because the nonlinear characteristic of the saturated and core material of transformer core magnetic flux, can produce the sizable magnetizing inrush current of amplitude, cause the transformer differential protection misoperation, cause winding deformation simultaneously and reduce transformer life; Magnetizing inrush current contains a plurality of harmonic componentss and DC component, can reduce the power system power supply quality, and the high order harmonic component in shoving simultaneously has extremely strong destruction to the responsive power electronic device that is connected in the electric power system; End is got up, and the harm of existing transformer excitation flow mainly is the protective relaying device malfunction that can cause transformer, makes the failure again and again that puts into operation of transformer; The voltage that is produced during the excision of transformer outlet short trouble is uprushed and can be brought out malfunction for tranformer protection, and each side load of transformer is all had a power failure; The no-load transformer in A power station inserts the magnetizing inrush current that power supply produces, and brings out that the transformer that is moving in contiguous other B power stations, C power station etc. produces " and echo surge current " (sympathetic inrush) and mistrip causes large-area power-cuts; The magnetizing inrush current that numerical value is very big can cause transformer and circuit breaker excessive impaired because of electric power; Bring out switching overvoltage, damage electric equipment; DC component in the magnetizing inrush current causes the current transformer magnetic circuit excessively to be magnetized and significantly reduces the performance factor of certainty of measurement and protective relaying device; A large amount of harmonic waves in the magnetizing inrush current cause serious pollution to the electrical network quality of power supply; Cause line voltage to rise sharply or rapid drawdown, influence other electric equipment operate as normal.In modern power systems, there are two transformers standby each other usually, in order to make transformer be in the state of economical operation, will be according to load switching transformer, in the automatic switching process of transformer, can produce magnetizing inrush current, especially it is very big to work as load variations, transformer needs the occasion of frequent switching, it is particularly important that the inhibition of magnetizing inrush current just seems, installs in order to save operating cost and to be convenient to, and often adopts magnetizing inrush current to suppress module and be integrated in the system, hardware circuit is changed slightly, realize this function by software, but the disclosed content of existing these technology that is that all right is ripe, also lack the further improvement and the support of many software and hardwares in the practice.
Summary of the invention:
The objective of the invention is to overcome the shortcoming that prior art exists, seek to design a kind of automatic switching formula transformer progress control method that suppresses the magnetizing inrush current function that has,, realize Transformer Economic operation and safeguard protection based on the transformer automatic switching of load.
To achieve these goals, the present invention cancels out each other by the circuit-breaker switching on-off voltage phase angle realization magnetic bias and the remanent magnetism of control electric power transport system, suppress the no-load transformer magnetizing inrush current and realize automatic switching, adopt feedback mechanism the increase electric power control accuracy and the reliability of transport system, make the electric power transport system from motion tracking and adapt to circuit breaker because of wearing out or the variation of the branch wire time that environmental change produces; Its concrete steps comprise:
(1) selects or install the transformer control system that comprises in the electric power transport system that hardware and software is formed, start the transformer control system of electric power transport system then, set or revise combined floodgate lead T, in second;
(2) the transformer control system is measured and record the voltage and current value that electric power transports in the circuit;
(3) go out the load power value according to the voltage and current magnitude calculation in the measured circuit;
(4) judge the automatic switching result according to the load power value that calculates,, continue to rerun after then returning step (2) as not needing automatic switching; As the needs automatic switching, each interconnection switch of closed low side successively then;
The phase angle Ф 1 of voltage when (5) making transformer control system autolog line current magnitude be zero, measurement circuitry voltage and current value simultaneously calculates the operating load performance number of its circuit again;
(6) according to the load power value of step (5), judging whether should automatic switching, if do not need automatic switching then return step (5); As the need automatic switching,, measure the phase angle Ф 2 of combined floodgate transient voltage simultaneously then according to the closed transformer high-voltage side switch of separating brake phase angle Ф 1 value;
(7) the transformer control system is judged Ф 1 and Ф 2 values voluntarily, and as Ф 1 ≠ Ф 2, the operation of transformer control system is returned initial step (1) and repeated; If Ф 1=Ф 2 values, then closed step down side switch disconnects the step down side interconnection switch again, realizes protection and control effect.
Operation implement device of the present invention is a core to open entering plate, comprises the switching value input processing circuit, and the switching value input processing circuit is finished the preliminary treatment that 12 way switch amounts are gathered; Its open into amount comprise the not energy storage of the position of the switch, spring, control loop broken string, remote operation locking, locking reclosing and standby open into; SAMPLE sampling plate plug-in unit comprises instrument transformer plate and signal regulating panel, finish sensing to the alternating voltage and the electric current of protected circuit, conditioning and processing and amplifying, convert the AC signal of electric power mutual-inductor to meet AD modular converter input range (0-3V) voltage signal, finally finish digital-to-analogue conversion by the AD modular converter; Power panel comprises power circuit, and power circuit provides low-voltage dc power supply for apparatus system: switching value input and output usefulness+24V power supply, CPU and display panel used+5V power supply; Communication module is integrated in the DSP control board, realizes between each device, and data communication between device and the controlling platform, be convenient to the control operation and management of whole system; CPU in the control device system adopts 32 bit DSP digital signal processor TMSF2811 as core component, cpu motherboard is communicated with other card electrical information, finishes functions such as AD conversion, switch acquisition, switching value output, man-machine interface control, EEPROM access, clock access, Communication Control and inhibition magnetizing inrush current; Cpu motherboard adopts four layers of printed panel and surface packaging technique.
The present invention is on the basis of using existing transformer backup protection measure and control device; add based on the automatic switching device and the no-load transformer switching magnetizing inrush current restraining device of transformer economic operation or have the device of identical function; common constitute transformer control system or the device that comprises that hardware and software is formed, electric connection insert realize in the electric power transport system to the transformer automatic switching and suppress magnetizing inrush current effect.
The present invention compared with prior art can realize the automatic switching of transformer based in load, makes transformer be in the economical operation state, reduces electric power transport system operating cost, uses manpower and material resources sparingly; In the automatic switching of transformer, suppress open-circuit excitation and shove, make the stable and reliable operation of electric power transport system; Inhibition link at magnetizing inrush current is introduced feedback mechanism, make control more accurate, and can make the transformer control system adapt to the variation of the aging and external environment of circuit breaker automatically, its overall control procedure is scientific and reasonable, and technology path is simple, manipulates safety, control performance is reliable, small investment, operating cost is low, is convenient to promote the use of.
Description of drawings:
Fig. 1 is a workflow schematic block diagram of the present invention.
Fig. 2 is the wire connection structure principle schematic of transformer control system of the present invention.
Embodiment:
Also in conjunction with the accompanying drawings the present invention is done a step explanation below by embodiment.
Embodiment:
Present embodiment is cancelled out each other by the circuit-breaker switching on-off voltage phase angle realization magnetic bias and the remanent magnetism of control electronic transport system, suppress the no-load transformer magnetizing inrush current, and realization automatic switching, adopt feedback mechanism to increase the control accuracy and the reliability of electronic transport system, make the electronic transport system from motion tracking and adapt to circuit breaker because of wearing out or the variation of the branch wire time that environmental change produces; The specific implementation step comprises:
(1) combined floodgate lead T is set or revised to start-up system;
(2) system is measured and record the voltage and current in the circuit;
(3) according to the voltage and current magnitude calculation load power value in the measured circuit;
(4) cut the throwing result automatically according to the performance number judgement of calculating,, then return step (2) and continue operation as not needing to cut automatically throwing; Cut throwing as need, then closed low side interconnection switch successively;
The phase angle Ф 1 of voltage when (5) system's autolog line electric current is zero, measurement circuitry voltage and current value is simultaneously calculated the operating load performance number of its circuit again;
(6), judge whether cut throwing automatically, if need not cut throwing then return step (5) according to the performance number of step (5); Cut throwing as need,, measure the phase angle Ф 2 of combined floodgate transient voltage simultaneously then according to the closed transformer high-voltage side switch of separating brake phase angle Ф 1 value;
(7) judge Ф 1 and Ф 2 values, as Ф 1 ≠ Ф 2, initial step (1) is returned in system's operation; If Ф 1=Ф 2 values, then closed step down side switch disconnects the step down side interconnection switch again, realizes the inhibition magnetizing inrush current and the automatic switching function of transformer control system.
The implement device of present embodiment is a core to open entering plate, comprises the switching value input processing circuit, and the switching value input processing circuit is finished the preliminary treatment that 12 way switch amounts are gathered; Its open into amount comprise the not energy storage of the position of the switch, spring, control loop broken string, remote operation locking, locking reclosing and standby open into; SAMPLE sampling plate plug-in unit comprises instrument transformer plate and signal regulating panel, finish sensing to the alternating voltage and the electric current of protected circuit, conditioning and processing and amplifying, convert the AC signal of electric power mutual-inductor to meet AD modular converter input range (0-3V) voltage signal, finally finish digital-to-analogue conversion by the AD modular converter; Power panel comprises power circuit, and power circuit provides low-voltage dc power supply for apparatus system: switching value input and output usefulness+24V power supply, CPU and display panel used+5V power supply; Communication module is integrated in the DSP control board, realizes between each device, and data communication between device and the controlling platform, be convenient to the control operation and management of whole system; CPU in the control device system adopts 32 bit DSP digital signal processor TMSF2811 as core component, cpu motherboard is communicated with other card electrical information, finishes functions such as AD conversion, switch acquisition, switching value output, man-machine interface control, EEPROM access, clock access, Communication Control and inhibition magnetizing inrush current; Cpu motherboard adopts four layers of printed panel and surface packaging technique.
Present embodiment is on the basis of using existing transformer backup protection measure and control device; add based on the automatic switching device and the no-load transformer switching magnetizing inrush current restraining device of transformer economic operation or have the device of identical function; common constitute transformer control system or device, electric connection insert realize in the electronic transport system to the transformer automatic switching and suppress magnetizing inrush current effect.
Present embodiment uses in the transmitting transformer of multiple occasion, and its protective effect is obvious, and economic operation cost is low, and the repacking of being convenient to existing transmitting transformer inserts, and realizes effectively operation control, and is remarkable to protection transformer performance, the effect that increases the service life.
Claims (1)
1. automatic switching formula transformer progress control method that suppresses magnetizing inrush current, circuit-breaker switching on-off voltage phase angle realization magnetic bias and remanent magnetism by control electric power transport system are cancelled out each other, suppress the no-load transformer magnetizing inrush current and realize automatic switching, adopt feedback mechanism the increase electric power control accuracy and the reliability of transport system, make the electric power transport system from motion tracking and adapt to circuit breaker because of wearing out or the variation of the branch wire time that environmental change produces; It is characterized in that concrete steps comprise:
(1) selects or install the transformer control system that comprises in the electric power transport system that hardware and software is formed, start the transformer control system of electric power transport system then, set or revise combined floodgate lead T, in second;
(2) the transformer control system is measured and record the voltage and current value that electric power transports in the circuit;
(3) go out the load power value according to the voltage and current magnitude calculation in the measured circuit;
(4) judge the automatic switching result according to the load power value that calculates,, continue to rerun after then returning step (2) as not needing automatic switching; As the needs automatic switching, each interconnection switch of closed low side successively then;
The phase angle Ф 1 of voltage when (5) making transformer control system autolog line current magnitude be zero, measurement circuitry voltage and current value simultaneously calculates the operating load performance number of its circuit again;
(6) according to the load power value of step (5), judging whether should automatic switching, if do not need automatic switching then return step (5); As the need automatic switching,, measure the phase angle Ф 2 of combined floodgate transient voltage simultaneously then according to the closed transformer high-voltage side switch of separating brake phase angle Ф 1 value;
(7) the transformer control system is judged Ф 1 and Ф 2 values voluntarily, and as Ф 1 ≠ Ф 2, the operation of transformer control system is returned initial step (1) and repeated; If Ф 1=Ф 2 values, then closed step down side switch disconnects the step down side interconnection switch again, realizes protection and control effect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102398857A CN102299514A (en) | 2011-08-19 | 2011-08-19 | Automatic switching type transformer operation control method for inhibiting magnetizing inrush current |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011102398857A CN102299514A (en) | 2011-08-19 | 2011-08-19 | Automatic switching type transformer operation control method for inhibiting magnetizing inrush current |
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| CN102299514A true CN102299514A (en) | 2011-12-28 |
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| CN2011102398857A Pending CN102299514A (en) | 2011-08-19 | 2011-08-19 | Automatic switching type transformer operation control method for inhibiting magnetizing inrush current |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104319752A (en) * | 2014-11-06 | 2015-01-28 | 山东大学 | Inrush current restraining system and method based on residual magnetism prediction and circuit breaker discreteness improvement |
| CN109787347A (en) * | 2019-01-02 | 2019-05-21 | 中国船舶重工集团公司第七一九研究所 | A kind of double-power supply switching device and its switching method inhibiting transformer excitation flow |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1303156A (en) * | 2001-01-22 | 2001-07-11 | 南京南瑞继保电气有限公司 | Relay protection method based on excitation impedance variation to judge excitating surge current of transformer |
| CN1558482A (en) * | 2004-01-15 | 2004-12-29 | 叶念国 | Static exciter inrush current inhibition method and apparatus |
| CN1700550A (en) * | 2005-04-27 | 2005-11-23 | 叶念国 | Method for suppressing power transformer excitation surge current and suppressor |
| CN101563744A (en) * | 2006-11-29 | 2009-10-21 | 株式会社东芝 | Apparatus and method for compressing exciting inrush current of transformer |
-
2011
- 2011-08-19 CN CN2011102398857A patent/CN102299514A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1303156A (en) * | 2001-01-22 | 2001-07-11 | 南京南瑞继保电气有限公司 | Relay protection method based on excitation impedance variation to judge excitating surge current of transformer |
| CN1558482A (en) * | 2004-01-15 | 2004-12-29 | 叶念国 | Static exciter inrush current inhibition method and apparatus |
| CN1700550A (en) * | 2005-04-27 | 2005-11-23 | 叶念国 | Method for suppressing power transformer excitation surge current and suppressor |
| CN101563744A (en) * | 2006-11-29 | 2009-10-21 | 株式会社东芝 | Apparatus and method for compressing exciting inrush current of transformer |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104319752A (en) * | 2014-11-06 | 2015-01-28 | 山东大学 | Inrush current restraining system and method based on residual magnetism prediction and circuit breaker discreteness improvement |
| CN104319752B (en) * | 2014-11-06 | 2017-04-19 | 山东大学 | Inrush current restraining system and method based on residual magnetism prediction and circuit breaker discreteness improvement |
| CN109787347A (en) * | 2019-01-02 | 2019-05-21 | 中国船舶重工集团公司第七一九研究所 | A kind of double-power supply switching device and its switching method inhibiting transformer excitation flow |
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Application publication date: 20111228 |