CN109038491A - A kind of large-scale power transformer excitation surge current suppressing method - Google Patents
A kind of large-scale power transformer excitation surge current suppressing method Download PDFInfo
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- CN109038491A CN109038491A CN201810742543.9A CN201810742543A CN109038491A CN 109038491 A CN109038491 A CN 109038491A CN 201810742543 A CN201810742543 A CN 201810742543A CN 109038491 A CN109038491 A CN 109038491A
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- phase
- breaker
- surge current
- magnetic flux
- excitation surge
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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
- H02H7/04—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 for transformers
-
- 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
- H02H7/04—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 for transformers
- H02H7/045—Differential protection of transformers
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
Abstract
The present invention discloses a kind of large-scale power transformer excitation surge current suppressing method, step 1: main transformer high-pressure side breaker two sides voltage signal is acquired respectively, wherein the data close to grid side are U1a、U1b、U1c, the data close to main transformer side are U2a、U2b、U2c；Step 2: the calculating transformer high-pressure side breaker open operation moment；Step 3: according to breaker open operation moment and U1a、U1b、U1cCalculate separately A, B, C three-phase magnetic flux average value；Step 4: utilizing U2a、U2b、U2cIt calculates separately Three-Phase Transformer residual flux and comparing calculation goes out mximum residual magnetism phase and its mximum residual magnetism is logical；Step 5: according to gained mximum residual magnetism phase and its remanent magnetism magnetic flux in step 4 and considering that breaker delay calculates breaker closing phase angle.Solve excitation surge current there may be differential protection malfunction, the harm such as deteriorate power quality and cause switching overvoltage and then keep equipment impaired.
Description
Technical field
The present invention relates to high voltage and insulation technology field, espespecially field transformer, and in particular to a kind of large-scale power becomes
Depressor excitation surge current suppressing method.
Background technique
Power transformer plays a part of connecting different voltages level Grid in the power system, is most important in system
Whether one of electrical equipment, transformer work normally the reliability for being directly related to electric system.Transformer is during switching
Biggish electric current, i.e. excitation surge current may be supervened.Excitation surge current amplitude is likely to be breached the several times of rated current, and contains
A large amount of aperiodic components and higher hamonic wave.Biggish excitation surge current is there may be differential protection malfunction, deterioration power quality and draws
It plays switching overvoltage and then makes equipment is impaired to wait harm, therefore inhibit transformer excitation flow to become each power industry and pay close attention to the most
One of the problem of.
Domestic and international major colleges and universities and institute have made many researchs in excitation surge current field.John H.Brunke,
Klaus J.Deng having carried out going deep into theoretical research to transformer excitation flow mechanism of production, it is believed that transformer remanent magnetism and
Closing phase angle is its principal element for generating excitation surge current, if rationally controlling closing phase angle, so that the magnetic that moment of closing a floodgate generates
It is logical identical as transformer remanent magnetism magnetic flux, then basically will not produce excitation surge current, and transformer remanent magnetism is proposed based on hysteresis loop
Calculation method.Later, many scholars have carried out the research work largely inhibited about excitation surge current based on the theory.Another party
Face studies its and differentiates feature from excitation surge current unique characteristics, for example, it is larger based on excitation surge current even-order harmonic, containing big
Measuring higher hamonic wave and waveform has the foundation of the feature extractions such as interval angle differentiation excitation surge current, and then studies transformer control and protect
Shield strategy.
The studies above work largely belongs to theoretical research, and algorithm is complicated, and especially calculation of residual flux algorithm needs to expend
Many computing resources.Therefore it is difficult to apply in actual electric network engineering, at present the routine when transformer is newly thrown by substation
Processing method is that switching transformer exits charge protection first in the process to avoid false protection.Therefore, a kind of method is simple, practical
The research and development of effective magnetizing inrush current suppression device are of great significance to operation of power networks.The present inventor passes through the industry of many years
Experience and productive accumulation provide a kind of easy to operate, effectively practical in conjunction with transforming plant main transformer Start-up and Adjustment engineering experience abundant
Inhibit device with the transformer excitation flow maintained easily.
Summary of the invention
A kind of large-scale power transformer excitation surge current suppressing method of the present invention, its purpose is to provide a kind of practicability and effectiveness,
Convenient for the large-scale power transformer excitation surge current suppressing method of practical implementation, to avoid or reduce close space-variant test with
And the excitation surge current during switching main transformer, it effectively prevent the impact to transformer winding, guarantee power system security.
To achieve the goals above, a kind of large-scale power transformer excitation surge current suppressing method step of the present invention are as follows: step
1: main transformer high-pressure side breaker two sides voltage signal is acquired respectively, wherein the data close to grid side are 1 data U of channel1a、U1b、
U1c, the data close to main transformer side are 2 data U of channel2a、U2b、U2c；Step 2: according to U in step 11a、U1b、U1cAnd U2a、U2b、
U2c, the calculating transformer high-pressure side breaker open operation moment；Step 3: according to breaker open operation moment and U1a、U1b、U1cIt calculates separately
A, B, C three-phase magnetic flux average value；Step 4: based on three phase average residual fluxes in breaker open operation moment in step 2 and step 3, benefit
Use U2a、U2b、U2cIt calculates separately Three-Phase Transformer residual flux and comparing calculation goes out mximum residual magnetism phase and its mximum residual magnetism is logical；Step
5；According to gained mximum residual magnetism phase and its remanent magnetism magnetic flux in step 4 and consider that breaker delay calculates breaker closing phase angle；
As A, B, C three-phase voltage derivative dU in channel 22a/dt、dU2b/dt、dU2c/ dt three-phase voltage corresponding with channel 1 is led
Number dU1a/dt、dU1b/dt、dU1cThe difference of/dt monitors three-phase voltage U in channel 2 more than 1% and in a cycle2a、
U2b、U2cWhen dropping to 2% or less, it is determined as breaker open operation moment T at the time of being greater than 1% according to three-phase voltage derivative difference1, so
After read T1- 0.2s arrives T1Three-phase voltage data in period；
Voltage data U in channel 1 is utilized in step 31a、U1b、U1cCalculate every phase remanent magnetism average value；
Voltage data U in channel 2 is utilized in step 42a、U2b、U2cIt is disconnected that breaker is calculated with Date of residual magnetism average in step 3
Open rear three-phase remanent magnetism magnetic flux；
According to the maximum phase of remanent magnetism in step 4 and its remanent magnetism magnetic flux, according to the remanent magnetism magnetic flux and next time for making remanent magnetism maximum phase
The breaker closing moment generates the identical principle of magnetic flux in the phase and calculates the optimal closing phase angle of breaker next time.
Using above-mentioned technological means, the present invention acquires main transformer high-pressure side breaker two sides voltage signal respectively, calculates
The high voltage side of transformer breaker open operation moment and A, B, C three-phase magnetic flux average value are calculated separately, utilizes U2a、U2b、U2cIt calculates separately
Three-Phase Transformer residual flux and comparing calculation go out mximum residual magnetism phase and its mximum residual magnetism is logical；According to gained mximum residual magnetism phase and its remain
Magnetic magnetic flux simultaneously considers that breaker delay calculates the optimal closing phase angle of breaker, to realize the inhibition to transformer excitation flow
Function, solve excitation surge current there may be differential protection malfunction, deteriorate power quality and cause switching overvoltage and then to make to set
By the harm such as damage.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is the present invention
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 is a kind of large-scale power transformer excitation surge current suppressing method operation principle schematic diagram of the present invention；
Fig. 2 is a kind of large-scale power transformer excitation surge current suppressing method reading data strategic process schematic diagram of the present invention；
Fig. 3 is a kind of large-scale power transformer excitation surge current suppressing method closing phase angle calculation flow chart of the present invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Embodiment one
Fig. 1 is a kind of large-scale power transformer excitation surge current suppressing method Whole Work Flow figure of the present invention.Mainly include
Following steps, step 1: reading main transformer high-pressure side breaker two sides voltage signal respectively；Step 2: according to three-phase in step 1
The voltage waveform data calculating transformer high-pressure side breaker open operation moment；Step 3: according to breaker calculated in step 2 point
Lock moment and voltage waveform data calculate separately three-phase magnetic flux average value；Step 4: according to the breaker open operation moment in step 2 and
2 voltage waveform data of channel, which calculates separately Three-Phase Transformer residual flux and compares, in step 3 obtains mximum residual magnetism phase；Step 5: root
According to gained mximum residual magnetism phase and its remanent magnetism magnetic flux in step 4, according to the remanent magnetism magnetic flux for making remanent magnetism maximum phase and open circuit next time
Device closing moment generates the identical principle of magnetic flux in the phase, calculates the optimal closing phase angle of breaker next time.
Fig. 2 is that large-scale power transformer excitation surge current inhibits equipment voltage reading data flow chart.As A, B, C in channel 2
Three-phase voltage derivative dU2a/dt、dU2b/dt、dU2c/ dt three-phase voltage derivative dU corresponding with channel 11a/dt、dU1b/dt、dU1c/dt
Difference three-phase voltage U in channel 2 is monitored more than 1% and in a cycle2a、U2b、U2cWhen dropping to 2% or less, according to
Three-phase voltage derivative difference is determined as breaker open operation moment T at the time of being greater than 1%1, then read T1- 0.2s arrives T1In period
Three-phase voltage data.
Fig. 3 is that large-scale power transformer excitation surge current inhibits instrument closing phase angle calculation flow chart.Mainly have as shown in Figure 3
Following steps: calculating three-phase magnetic flux average value first.Respectively to a positive half-wave of 1 three-phase voltage Wave data of channel into
Row integral, the every phase average magnetic flux of calculating transformer:
Wherein t1For integral calculation initial time, i.e. voltage waveform zero passage and at the time of derivative is greater than zero；
T is wave period, is 0.02s in this value
Δ t is the three-phase phase time difference, is 6.67ms in this value
According to 2 three-phase voltage waveform of channel, every phase magnetic flux cumulative function is calculated:
Every phase magnetic flux cumulative function is to become upper integral function, wherein T1The moment is cut-off for breaker, each magnetic flux function
10 cycles before calculating when starting point is breaker disconnection, and integration variable meets t≤T1。
According to channel 1,2 magnetic flux function calculated result of channel, every phase magnetic flux function is calculated:
φA=φAI-ΦAave
φB=φBI-ΦBave
φC=φCI-ΦCave
Every phase remanent magnetism after breaker disconnects is calculated according to every phase magnetic flux function:
φAT=φA|T=T1
φBT=φB|T=T1
φCT=φC|T=T1
Compare three-phase calculation of residual flux as a result, and select remanent magnetism maximum phase, calculate ideal closing phase angle:
WhereinPhase angle when mutually being cut-off for remanent magnetism is maximum,For ideal closing phase angle.
Breaker closing phase calculation:
WhereinFor the corresponding angle of breaker closing delay time,For breaker closing phase angle.According to breaker
Closing phase angle calculates and exports switching signal.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (5)
1. a kind of large-scale power transformer excitation surge current suppressing method, which is characterized in that
Step 1: main transformer high-pressure side breaker two sides voltage signal is acquired respectively, wherein the data close to grid side are the number of channel 1
According to U1a、U1b、U1c, the data close to main transformer side are 2 data U of channel2a、U2b、U2c；
Step 2: according to U in step 11a、U1b、U1cAnd U2a、U2b、U2c, the calculating transformer high-pressure side breaker open operation moment；
Step 3: according to breaker open operation moment and U1a、U1b、U1cCalculate separately A, B, C three-phase magnetic flux average value；
Step 4: based on three phase average residual fluxes in breaker open operation moment in step 2 and step 3, utilizing U2a、U2b、U2cRespectively
Calculating transformer three-phase residual flux and comparing calculation go out mximum residual magnetism phase and its mximum residual magnetism is logical；
Step 5: according to gained mximum residual magnetism phase and its remanent magnetism magnetic flux in step 4 and considering that breaker delay calculates breaker and closes
Lock phase angle.
2. a kind of large-scale power transformer excitation surge current suppressing method according to claim 1, it is characterised in that when channel 2
Middle A, B, C three-phase voltage derivative dU2a/dt、dU2b/dt、dU2c/ dt three-phase voltage derivative dU corresponding with channel 11a/dt、dU1b/
dt、dU1cThe difference of/dt monitors three-phase voltage U in channel 2 more than 1% and in a cycle2a、U2b、U2cDrop to 2% with
When lower, it is determined as breaker open operation moment T at the time of being greater than 1% according to three-phase voltage derivative difference1, then read T1- 0.2s arrives T1
Three-phase voltage data in period.
3. a kind of large-scale power transformer excitation surge current suppressing method according to claim 1, it is characterised in that in step 3
Utilize voltage data U in channel 11a、U1b、U1cCalculate every phase remanent magnetism average value.
4. a kind of large-scale power transformer excitation surge current suppressing method according to claim 1, it is characterised in that in step 4
Utilize voltage data U in channel 22a、U2b、U2cThree-phase remanent magnetism magnetic flux after breaker disconnects is calculated with Date of residual magnetism average in step 3
Amount.
5. a kind of large-scale power transformer excitation surge current suppressing method according to claim 1, it is characterised in that according to step
The maximum phase of remanent magnetism and its remanent magnetism magnetic flux in rapid 4, according to the remanent magnetism magnetic flux for making remanent magnetism maximum phase and next breaker closing moment
The identical principle of magnetic flux is generated in the phase calculates the optimal closing phase angle of breaker next time.
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| CN201810742543.9A CN109038491B (en) | 2018-07-05 | 2018-07-05 | Large power transformer magnetizing inrush current suppression method |
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Cited By (2)
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| CN110535110A (en) * | 2019-09-05 | 2019-12-03 | 国网山东省电力公司电力科学研究院 | Extra-high-voltage alternating current transformer option principle control method and device |
| CN112763801A (en) * | 2021-04-07 | 2021-05-07 | 国网江西省电力有限公司电力科学研究院 | Method for measuring maximum switching phase angle of phase selection switching-on device of extra-high voltage converter station |
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| CN110535110A (en) * | 2019-09-05 | 2019-12-03 | 国网山东省电力公司电力科学研究院 | Extra-high-voltage alternating current transformer option principle control method and device |
| CN110535110B (en) * | 2019-09-05 | 2021-09-24 | 国网山东省电力公司电力科学研究院 | Phase selection switching-on and switching-off control method and device for extra-high voltage alternating current transformer |
| CN112763801A (en) * | 2021-04-07 | 2021-05-07 | 国网江西省电力有限公司电力科学研究院 | Method for measuring maximum switching phase angle of phase selection switching-on device of extra-high voltage converter station |
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