CN105931823A - Method for automatic tracking adjustment of resonance elimination resistor of voltage transformer - Google Patents

Method for automatic tracking adjustment of resonance elimination resistor of voltage transformer Download PDF

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Publication number
CN105931823A
CN105931823A CN201610494535.8A CN201610494535A CN105931823A CN 105931823 A CN105931823 A CN 105931823A CN 201610494535 A CN201610494535 A CN 201610494535A CN 105931823 A CN105931823 A CN 105931823A
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voltage
voltage transformer
harmonic elimination
resonance
resistance
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CN105931823B (en
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张安斌
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/343—Preventing or reducing surge voltages; oscillations
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/40—Structural association with built-in electric component, e.g. fuse
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/40—Structural association with built-in electric component, e.g. fuse
    • H01F27/402—Association of measuring or protective means

Abstract

The invention discloses a method for automatic tracking adjustment of a resonance elimination resistor of a voltage transformer. For the running voltage transformer, the resistance of the resonance elimination resistor is adjusted according to an open delta voltage or a three-phase secondary voltage of the voltage transformer, so that automatic tracking adjustment of the resonance elimination resistor is achieved; the resonance elimination resistor runs online all the time; and resonance of the voltage transformer is actively prevented.

Description

The method of the automatic tracking adjustment of voltage transformer harmonic elimination resistance
The application is filing date 20141020, Application No. 2014105590819, invention entitled voltage transformer harmonic elimination electricity Hinder the method for automatic tracking adjustment, apply for the divisional application of artificial Zhang Anbin.
Technical field
The present invention relates to power equipment, a kind of method of voltage transformer automatic tracking adjustment of harmonic elimination resistance.
Background technology
Microcomputer resonance eliminator is the major product eliminating voltage transformer resonance at present, the knot that the three-phase windings of open delta is connected in series Configuration formula so that the output of open delta is sufficiently complex with the voltage relationship of open delta so that put into electricity at open delta Opinions vary for the size of resistance, for preventing open-triangular winding from transshipping, when voltage transformer resonance being detected, throws at open delta Enter a little valued resistor or short circuit open delta.
Put into resistance can eliminate voltage transformer resonance at voltage transformer open delta is a known reason, harmonic elimination resistance The least harmonic elimination ability is the best, but the most easily causes voltage transformer winding overload, and overload makes core sataration cause new resonance until damaging Bad voltage transformer, disappears so prior art uses the short time to put into little resistance harmonic elimination the resistance even way of short circuit open delta Humorous, prevent long term overloading from burning out voltage transformer with this.On the one hand, the resonance eliminator of prior art is just to take measures after resonance, Namely passive type protected mode；On the other hand, in actual motion, it is that single-phase earthing or voltage transformer resonance are in some feelings It is difficult to judge under condition, and when cannot accurately judge resonance or singlephase earth fault, disappears to prevent from burning out voltage transformer Humorous resistance does not puts into, the most not short circuit open delta.When single-phase earthing, put into harmonic elimination resistance make in open delta around Group overload causes core sataration to produce new voltage transformer resonance, cause dead band, a lot of mistaken ideas can not harmonic elimination, as single-phase earthing draws Electricity pressure mutual-inductor resonance does not put into harmonic elimination resistance due to microcomputer resonance eliminator, and the microcomputer resonance eliminator of prior art is the most helpless.
Voltage transformer resonance is categorized as industrial frequency resonance, high-frequency resonant and Subharmonic Resonance, wherein, and high-frequency resonant, Subharmonic Resonance Frequency and power frequency are the most different, and microcomputer technology is easy to make a distinction this, if as long as open delta has high frequency, frequency dividing amount Existence it may determine that going out it is high-frequency resonant or Subharmonic Resonance, that is microcomputer technology can with 100% find high frequency, point Frequently resonance the elimination resonance that takes measures, microcomputer resonance eliminator can administer high frequency, Subharmonic Resonance completely.
Insoluble is exactly industrial frequency resonance, system generation singlephase earth fault, and open delta has power-frequency voltage, and a lot of work Frequently resonance is the same with the feature of single-phase earthing, say, that it is voltage transformer that open delta has power-frequency voltage but cannot judge When resonance or system jam, particularly open delta voltage are less than 100V, on the one hand during single-phase earthing, put into harmonic elimination electricity Resistance makes the winding overload in open delta cause core sataration to produce new voltage transformer resonance, on the other hand throws during single-phase earthing Entering harmonic elimination resistance can make voltage transformer winding overload burn out voltage transformer, especially by the harmonic elimination mode of open delta short circuit.
Here it is why at present microcomputer resonance eliminator sometimes can harmonic elimination sometimes can not the reason of harmonic elimination.High frequency, Subharmonic Resonance are entirely capable of Harmonic elimination, for industrial frequency resonance because not accurately distinguishing with singlephase earth fault, single-phase earthing is as too small in the harmonic elimination resistance of input to be caused Open-triangular winding overload causes new resonance and voltage transformer group to burn out, the industrial frequency resonance as single-phase earthing feature and list The resonance that phase ground connection is caused, existing microcomputer resonance eliminator do not put into resistance and can not harmonic elimination.
Summary of the invention
The present invention is for avoiding the weak point existing for above-mentioned prior art, it is provided that a kind of voltage transformer harmonic elimination resistance automatically with The method that track adjusts, during to solving single-phase earthing the winding overload in harmonic elimination resistance sizes and voltage transformer open delta this To contradiction, solve the resonance of initiation during a difficult problem that singlephase earth fault is difficult to differentiate between and single-phase earthing with industrial frequency resonance feature, Automatically tracking adjustment harmonic elimination resistance all the period of time on-line operation actively prevents voltage transformer resonance.
The present invention solves that technical problem adopts the following technical scheme that
The method of the voltage transformer automatic tracking adjustment of harmonic elimination resistance of the present invention, described harmonic elimination resistance Rx is connected across voltage transformer The two ends of open delta, are characterized in: arrange voltage transformer open delta voltage U△Voltage monitoring；Or it is mutual to arrange voltage Sensor open delta voltage U△And the monitoring of system three-phase secondary voltage；Described voltage transformer harmonic elimination resistance is adjusted from motion tracking Whole method is to carry out as follows:
Step 1, value that harmonic elimination resistance Rx puts into first is set for not less than R100, R100=5773.5/KS；
After harmonic elimination resistance Rx puts into:
If U△≤ 15V, then harmonic elimination resistance Rx value is not less than R0, R0=(U△+100)U△/3KS；
Otherwise, then harmonic elimination resistance Rx value is not less than R, θ=acrcos (U△/100)；Or R=UMXU△/ √ 3KS, UMXFor now monitoring the maximum in the system three-phase secondary voltage of acquisition Value；
Step 2, for operating voltage transformer, as follows adjust harmonic elimination resistance Rx
(1) if open delta voltage U△For increasing, and amplification is not less than 5%, and adjusting harmonic elimination resistance Rx is not less than R100；Continue Continuous monitoring open delta voltage is U△1, according to U△1Adjust harmonic elimination resistance Rx not less than R1；And have:
If U△1≤ 15V, R1=(U△1+100)U△1/3KS；
Otherwise,θ=acrcos (U△1/ 100), or:
R1=UMX1U△1/ √ 3KS, wherein UMX1For now monitoring the maximum in the system three-phase secondary voltage of acquisition；
(2) if open delta voltage U△For reducing, and amount of decrease is not less than 5%, and monitoring open delta voltage is U△2, according to U△2Adjust harmonic elimination resistance Rx not less than R2；And have:
Work as U△2During≤15V, R2=(U△2+100)U△2/3KS；
Otherwise,θ=acrcos (U△2/ 100), or:
R2=UMX2U△2/ √ 3KS, UMX2For now monitoring the maximum in the system three-phase secondary voltage of acquisition；
Wherein, K is voltage transformer excitation property voltage multiplication, and S is the every mutually specified apparent energy of voltage transformer.
The feature of the method for the voltage transformer automatic tracking adjustment of harmonic elimination resistance of the present invention lies also in: described voltage transformer opening three Angle voltage U△It is to be obtained, U by the output electric current I of monitoring voltage transformer open delta△=IRx.
The feature of the method for the voltage transformer automatic tracking adjustment of harmonic elimination resistance of the present invention lies also in: when voltage transformer open delta Voltage U△When being zero, system is in three-phase voltage balance, and harmonic elimination resistance Rx value is 0；It is in three-phase voltage in described system During balance, the change for described voltage transformer open delta output electric current I is monitored, when described output electric current I occurs During change, adjusting harmonic elimination resistance Rx is not less than R100, as described in step 2, method is adjusted subsequently.
The feature of the method for the voltage transformer automatic tracking adjustment of harmonic elimination resistance of the present invention lies also in: determine for K value and S value Voltage transformer, open delta voltage U△It is divided into some sections, U according to 0～100V△DFor the maximum electricity in each section Pressure value, the harmonic elimination resistance Rx that each section is corresponding is not less than RD；
For U△The section of≤15V, RD=(U△D+100)U△D/3KS；
Otherwise,θ=acrcos (U△D/100)。
The feature of the method for the voltage transformer automatic tracking adjustment of harmonic elimination resistance of the present invention lies also in: described system three-phase secondary voltage Can obtain by carrying out voltage monitoring for every phase winding of described voltage transformer open delta, and, the former is the latter Radical sign 3 times.
The feature of the method for the voltage transformer automatic tracking adjustment of harmonic elimination resistance of the present invention lies also in: do not put in properly functioning The voltage transformer of harmonic elimination resistance, as voltage transformer open delta voltage monitor value U△WWhen meeting or exceeding 15V,
Adjusting harmonic elimination resistance Rx is not less than RW,
θ=acrcos (U△W/100)。
Compared with the prior art, the present invention has the beneficial effect that:
1, the present invention has eradicated voltage transformer resonance, it is ensured that system safety operation；
2, the automatic tracking adjustment of harmonic elimination resistance in the present invention, harmonic elimination resistance all the period of time operation, it is achieved actively harmonic elimination, the most passively Ground goes after there is resonance to judge；
3, when the present invention solves system three-phase imbalance, how open delta controlled harmonic elimination resistance adjusts problem；
4, the present invention when solving system generation single-phase earthing controlled harmonic elimination resistance how to adjust problem；
When 5, this invention also solves system phase fault, how controlled harmonic elimination resistance adjusts problem.
Accompanying drawing explanation
The voltage vector-diagram that Fig. 1 is singlephase earth fault θ < 60 °；
The voltage vector-diagram that Fig. 2 is singlephase earth fault θ > 60 °；
The voltage vector-diagram of Fig. 3 singlephase earth fault θ=60 °；
Detailed description of the invention
The method of the automatic tracking adjustment of voltage transformer harmonic elimination resistance in the present embodiment, its harmonic elimination resistance Rx is connected across mutual induction of voltage The two ends of device open delta, arrange voltage transformer open delta voltage U△Voltage monitoring；Or voltage transformer opening is set Triangular voltages U△And the monitoring of system three-phase secondary voltage；The method of the automatic tracking adjustment of voltage transformer harmonic elimination resistance be by Following steps are carried out:
Step 1, value that harmonic elimination resistance Rx puts into first is set for not less than R100, R100=5773.5/KS；
After harmonic elimination resistance Rx puts into:
If U△≤ 15V, then harmonic elimination resistance Rx value is not less than R0, R0=(U△+100)U△/3KS；
Otherwise, then harmonic elimination resistance Rx value is not less than R, θ=acrcos (U△/100)；Or R=UMXU△/ √ 3KS, UMXFor now monitoring the maximum in the system three-phase secondary voltage of acquisition Value；
Step 2, for operating voltage transformer, as follows adjust harmonic elimination resistance Rx
(1) if open delta voltage U△For increasing, and amplification is not less than 5%, and adjusting harmonic elimination resistance Rx is not less than R100；Continue Continuous monitoring open delta voltage is U△1, according to U△1Adjust harmonic elimination resistance Rx not less than R1；And have:
If U△1≤ 15V, R1=(U△1+100)U△1/3KS；
Otherwise,θ=acrcos (U△1/ 100), or:
R1=UMX1U△1/ √ 3KS, wherein UMX1For now monitoring the maximum in the system three-phase secondary voltage of acquisition；
(2) if open delta voltage U△For reducing, and amount of decrease is not less than 5%, and monitoring open delta voltage is U△2, according to U△2Adjust harmonic elimination resistance Rx not less than R2；And have:
Work as U△2During≤15V, R2=(U△2+100)U△2/3KS；
Otherwise,θ=acrcos (U△2/ 100), or:
R2=UMX2U△2/ √ 3KS, UMX2For now monitoring the maximum in the system three-phase secondary voltage of acquisition；
Wherein, K is voltage transformer excitation property voltage multiplication, and S is the every mutually specified apparent energy of voltage transformer.
In being embodied as:
Voltage transformer open delta voltage U△Can also be to be obtained by the output electric current I of monitoring voltage transformer open delta , U△=IRx.
As voltage transformer open delta voltage U△When being zero, system is in three-phase voltage balance, and harmonic elimination resistance Rx value is 0； When system is in three-phase voltage balance, the change for voltage transformer open delta output electric current I is monitored, and works as output When electric current I changes, adjusting harmonic elimination resistance Rx is not less than R100, it is adjusted by step 2 method subsequently.
The voltage transformer that K value and S value are determined, open delta voltage U△It is divided into some sections according to 0～100V, U△DFor the maximum voltage value in each section, the harmonic elimination resistance Rx that each section is corresponding is not less than RD；
For U△The section of≤15V, RD=(U△D+100)U△D/3KS；
Otherwise,θ=acrcos (U△D/100)。
System three-phase secondary voltage can obtain by carrying out voltage monitoring for every phase winding of voltage transformer open delta, Further, the former is the radical sign 3 times of the latter.
Additionally, by present implementation, for not putting into the voltage transformer of harmonic elimination resistance in properly functioning, when voltage transformer leaves Mouth triangular voltages monitor value U△WWhen meeting or exceeding 15V, adjusting harmonic elimination resistance Rx is not less than RW,
θ=acrcos (U△W/100)。
Open delta put into suitable resistance can 100% harmonic elimination, the problem of current microcomputer resonance eliminator is: singlephase earth fault with The feature of a lot of industrial frequency resonances is just the same, it is impossible to distinguish fault type, it is impossible to put into resistance harmonic elimination, if single-phase earthing puts into The too small meeting of harmonic elimination resistance causes open-triangular winding overload core sataration to cause new resonance, and single-phase earthing ability also can cause Resonance.Following discussion in the case of three-phase imbalance, unbalanced fault (single-phase earthing belongs to unbalanced fault), how automatically with Track adjusts controlled harmonic elimination resistance.
One, for the automatic tracking adjustment of harmonic elimination resistance in the case of single-phase earthing
During system single-phase arc grounding fault, on the one hand making open delta have power-frequency voltage, a lot of resonance are special with singlephase earth fault Levy striking resemblances, make microcomputer resonance eliminator that industrial frequency resonance cannot be judged and can not harmonic elimination；Between the most single-phase arc grounding continues The ground connection of having a rest property, repeated stock voltage transformer makes again voltage transformer be easy to resonance, now the microcomputer resonance eliminator of prior art Cannot judge and harmonic elimination resistance dare not be put into, until having an accident.
As it is shown in figure 1, as a example by B phase occurs single-phase earthing, Uam, Ubm, Ucm are the phase voltage of open delta three-phase, Open delta three relatively secondary voltage when Ua, Ub, Uc are B phase ground connection, Uo be neutral point voltage-to-ground be open delta electricity Pressure U△1/3rd, θ is the angle of residual voltage Uo and B phase phase voltage Ubm, B phase ground connection A phase-to-ground voltage Ua Maximum, the apparent energy of A phase is maximum, as long as guaranteeing other biphase opening that would not transship of A phase winding nonoverload in open delta Triangular voltages U△Obtained by monitoring, in right angled triangle △ OBG:
θ=acrcos (U△/100) (1)
As θ 60 °, as it is shown in figure 1, in triangle △ OAG, OA and OG is it is known that the angle of OA with OG is 120 ° of+θ, according to cosine law, are with the Ua that the length of AG characterizes:
As θ 60 °, as in figure 2 it is shown, in triangle △ OAG, OA and OG is it is known that the angle of OA with OG is 240 ° of-θ, and the cosine value that the cosine value of 240 ° of-θ is equal to 120 ° of+θ, according to cosine law, characterize with the length of AG Ua is identical with formula (2).
When θ=60 °, as it is shown on figure 3, Ua=50V, it is identical with the result calculated by formula (2).

Claims (1)

1. a method for the automatic tracking adjustment of voltage transformer harmonic elimination resistance, is characterized in that: do not put in properly functioning The voltage transformer of harmonic elimination resistance, as voltage transformer open delta voltage monitor value U△WWhen meeting or exceeding 15V,
Adjusting harmonic elimination resistance Rx is not less than RW；
θ=acrcos (U△W/100)。
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