CN105931823B - The method of the automatic tracking adjustment of voltage transformer harmonic elimination resistance - Google Patents
The method of the automatic tracking adjustment of voltage transformer harmonic elimination resistance Download PDFInfo
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- CN105931823B CN105931823B CN201610494535.8A CN201610494535A CN105931823B CN 105931823 B CN105931823 B CN 105931823B CN 201610494535 A CN201610494535 A CN 201610494535A CN 105931823 B CN105931823 B CN 105931823B
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- harmonic elimination
- voltage
- voltage transformer
- elimination resistance
- resistance
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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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Protection Of Transformers (AREA)
Abstract
The invention discloses a kind of method of the automatic tracking adjustment of voltage transformer harmonic elimination resistance, for operating voltage transformer, according to voltage transformer open delta voltage or three-phase secondary voltage adjustment harmonic elimination resistance, realize the automatic tracking adjustment of harmonic elimination resistance, make harmonic elimination resistance all the period of time on-line operation, actively prevent voltage transformer resonance.
Description
The application is to disappear for 20141020, Application No. 2014105590819, entitled voltage transformer the applying date
Method, the artificial Zhang Anbin of the application divisional application of the humorous automatic tracking adjustment of resistance.
Technical field
The present invention relates to power equipment, more specifically a kind of side of the automatic tracking adjustment of voltage transformer harmonic elimination resistance
Method.
Background technology
Microcomputer resonance eliminator is the major product for eliminating voltage transformer resonance at present, and the three-phase windings series connection of open delta connects
The structure type connect so that the power output of open delta and the voltage relationship of open delta are sufficiently complex so that in opening three
Opinions vary for the size of angle input resistance, to prevent open-triangular winding from overloading, when detecting voltage transformer resonance, is opening
Mouth triangle puts into one small valued resistor or short circuit open delta.
It is a known reason that can eliminate voltage transformer resonance in voltage transformer open delta input resistance, is disappeared
The humorous smaller harmonic elimination ability of resistance is better, but more easily causes voltage transformer winding overload, and overload makes core sataration trigger newly humorous
Shake until voltage transformer is damaged, so prior art puts into small resistance harmonic elimination resistance even short circuit open delta using the short time
Method carry out harmonic elimination, prevent long term overloading from burning out voltage transformer with this.On the one hand, after the resonance eliminator of prior art is resonance
Just take measures, that is, passive type protected mode；On the other hand, it is single-phase earthing or voltage transformer in actual motion
Resonance is being difficult to judge in some cases, and when can not accurate judgement be resonance or singlephase earth fault when, in order to prevent burning
Bad voltage transformer harmonic elimination resistance is not just put into, that is, not short circuit open delta.In single-phase earthing, input harmonic elimination resistance makes
Winding overload in open delta causes core sataration to produce new voltage transformer resonance, causes many mistaken ideas dead bands to disappear
It is humorous, such as the voltage transformer resonance that single-phase earthing triggers because microcomputer resonance eliminator does not put into harmonic elimination resistance, the microcomputer of prior art
Resonance eliminator is with regard to helpless.
Voltage transformer resonance is categorized as industrial frequency resonance, high-frequency resonant and Subharmonic Resonance, wherein, high-frequency resonant, frequency dividing are humorous
The frequency and power frequency shaken are completely different, and microcomputer technology is easy to make a distinction this, if as long as open delta has high frequency, divided
The presence of frequency amount is it may determine that it is high-frequency resonant or Subharmonic Resonance to go out it, that is microcomputer technology can find high with 100%
Frequently, Subharmonic Resonance and take measures to eliminate resonance, microcomputer resonance eliminator can administer high frequency, Subharmonic Resonance completely.
Insoluble is exactly industrial frequency resonance, and singlephase earth fault occurs for system, and open delta has power-frequency voltage, and very
The feature of more industrial frequency resonances and single-phase earthing is the same, that is to say, that it is voltage that open delta, which has power-frequency voltage can not but judge,
Put into when mutual-inductor resonance or system jam, particularly open delta voltage are less than 100V, during one side single-phase earthing
Harmonic elimination resistance makes the winding overload in open delta cause core sataration to produce new voltage transformer resonance, on the other hand single-phase
Harmonic elimination resistance is put into during ground connection can make voltage transformer winding overload burn out voltage transformer, especially by open delta short circuit
Harmonic elimination mode.
Here it is why current microcomputer resonance eliminator sometimes can harmonic elimination be unable to harmonic elimination sometimes.High frequency, Subharmonic Resonance
Harmonic elimination is entirely capable of, for industrial frequency resonance because that can not be accurately distinguished with singlephase earth fault, single-phase earthing such as the harmonic elimination resistance put into
It is too small to cause open-triangular winding overload to trigger new resonance and voltage transformer group to burn out, the work as single-phase earthing feature
The resonance that frequency resonance and single-phase earthing trigger, existing microcomputer resonance eliminator do not put into resistance and are unable to harmonic elimination.
The content of the invention
The present invention is to avoid the weak point present in above-mentioned prior art, there is provided a kind of voltage transformer harmonic elimination resistance
The method of automatic tracking adjustment, harmonic elimination resistance sizes and the winding in voltage transformer open delta during to solve single-phase earthing
This conflict is overloaded, is drawn during problem and single-phase earthing that solution singlephase earth fault is difficult to differentiate between with industrial frequency resonance feature
The resonance of hair, automatic tracking adjustment harmonic elimination resistance all the period of time on-line operation actively prevent voltage transformer resonance.
The present invention adopts the following technical scheme that to solve technical problem：
The method of the automatic tracking adjustment of voltage transformer harmonic elimination resistance of the present invention, it is mutual that the harmonic elimination resistance Rx is connected across voltage
The both ends of sensor open delta, are characterized in：Voltage transformer open delta voltage U is set△Voltage monitoring；Or voltage is set
Transformer open delta voltage U△And the monitoring of system three-phase secondary voltage；The voltage transformer harmonic elimination resistance is from motion tracking
The method of adjustment is to carry out as follows：
Step 1, the value for setting harmonic elimination resistance Rx to put into first are not less than R100, R100=5773.5/KS；
After harmonic elimination resistance Rx inputs：
If U△≤ 15V, then harmonic elimination resistance Rx values are not less than R0, R0=(U△+100)U△/3KS；
Conversely, then harmonic elimination resistance Rx values be not less than R,θ=
acrcos(U△/100)；Or R=UMXU△/ √ 3KS, UMXNow to monitor the maximum in the system three-phase secondary voltage of acquisition；
Step 2, for operating voltage transformer, adjust harmonic elimination resistance Rx as follows
(1) if open delta voltage U△To increase, and amplification is not less than 5%, and adjustment harmonic elimination resistance Rx is not less than R100；
It is U to continue to monitor open delta voltage△1, according to U△1Adjustment harmonic elimination resistance Rx is not less than R1；And have：
If U△1≤ 15V, R1=(U△1+100)U△1/3KS；
Conversely,θ=acrcos (U△1/ 100), or：
R1=UMX1U△1/ √ 3KS, wherein UMX1Now to monitor the maximum in the system three-phase secondary voltage of acquisition；
(2) if open delta voltage U△To reduce, and amount of decrease is not less than 5%, and monitoring open delta voltage is U△2, according to
U△2Adjustment harmonic elimination resistance Rx is not less than R2；And have：
Work as U△2During≤15V, R2=(U△2+100)U△2/3KS；
Conversely,θ=acrcos (U△2/ 100), or：
R2=UMX2U△2/ √ 3KS, UMX2Now to monitor the maximum in the system three-phase secondary voltage of acquisition；
Wherein, K is voltage transformer excitation property voltage multiplication, and S is voltage transformer per mutually specified apparent energy.
The characteristics of method of the automatic tracking adjustment of voltage transformer harmonic elimination resistance of the present invention, lies also in：The voltage transformer
Open delta voltage U△It is to be obtained by the output current I of monitoring voltage transformer open delta, U△=IRx.
The characteristics of method of the automatic tracking adjustment of voltage transformer harmonic elimination resistance of the present invention, lies also in：When voltage transformer is opened
Mouth triangular voltages U△When being zero, system is in three-phase voltage balance, and harmonic elimination resistance Rx values are 0；Three-phase is in the system
During the balance of voltage, the change for the voltage transformer open delta output current I is monitored, as the output current I
When changing, adjustment harmonic elimination resistance Rx is not less than R100, then it is adjusted by step 2 methods described.
The characteristics of method of the automatic tracking adjustment of voltage transformer harmonic elimination resistance of the present invention, lies also in：It is true for K values and S values
Fixed voltage transformer, open delta voltage U△It is some sections to divide according to 0~100V, U△DFor the maximum electricity in each section
Pressure value, harmonic elimination resistance Rx is not less than R corresponding to each sectionD；
For U△≤ 15V section, RD=(U△D+100)U△D/3KS；
Conversely,θ=acrcos (U△D/100)。
The characteristics of method of the automatic tracking adjustment of voltage transformer harmonic elimination resistance of the present invention, lies also in：The system three-phase two
Secondary voltage can carry out voltage monitoring to obtain by every phase winding for the voltage transformer open delta, also, preceding
Person is 3 times of the radical sign of the latter.
The characteristics of method of the automatic tracking adjustment of voltage transformer harmonic elimination resistance of the present invention, lies also in：For in normal operation
The voltage transformer of harmonic elimination resistance is not put into, as voltage transformer open delta voltage monitor value U△WWhen meeting or exceeding 15V,
It is not less than R to adjust harmonic elimination resistance RxW,
θ=acrcos (U△W/100)。
Compared with the prior art, the present invention has the beneficial effect that：
1st, the present invention has eradicated voltage transformer resonance, it is ensured that system safety operation；
2nd, the present invention in the automatic tracking adjustment of harmonic elimination resistance, harmonic elimination resistance all the period of time operation, realize active harmonic elimination, no longer by
Go to judge after resonance occurs dynamicly；
3rd, how the controllable harmonic elimination resistance of open delta adjusts problem when the present invention solves system three-phase imbalance；
4th, how controllable harmonic elimination resistance adjusts problem when the present invention solves system generation single-phase earthing；
5th, how this invention also solves controllable harmonic elimination resistance during system phase fault adjusts problem.
Brief description of the drawings
Fig. 1 singlephase earth faults θ<60 ° of voltage vector-diagram；
Fig. 2 singlephase earth faults θ>60 ° of voltage vector-diagram；
The voltage vector-diagram of Fig. 3 singlephase earth faults θ=60 °；
Embodiment
The method of the automatic tracking adjustment of voltage transformer harmonic elimination resistance in the present embodiment, its harmonic elimination resistance Rx are connected across voltage
The both ends of transformer open delta, voltage transformer open delta voltage U is set△Voltage monitoring；Or voltage transformer is set
Open delta voltage U△And the monitoring of system three-phase secondary voltage；The method of the automatic tracking adjustment of voltage transformer harmonic elimination resistance
It is to carry out as follows：
Step 1, the value for setting harmonic elimination resistance Rx to put into first are not less than R100, R100=5773.5/KS；
After harmonic elimination resistance Rx inputs：
If U△≤ 15V, then harmonic elimination resistance Rx values are not less than R0, R0=(U△+100)U△/3KS；
Conversely, then harmonic elimination resistance Rx values be not less than R,θ=
acrcos(U△/100)；Or R=UMXU△/ √ 3KS, UMXNow to monitor the maximum in the system three-phase secondary voltage of acquisition；
Step 2, for operating voltage transformer, adjust harmonic elimination resistance Rx as follows
(1) if open delta voltage U△To increase, and amplification is not less than 5%, and adjustment harmonic elimination resistance Rx is not less than R100；
It is U to continue to monitor open delta voltage△1, according to U△1Adjustment harmonic elimination resistance Rx is not less than R1；And have：
If U△1≤ 15V, R1=(U△1+100)U△1/3KS；
Conversely,θ=acrcos (U△1/ 100), or：
R1=UMX1U△1/ √ 3KS, wherein UMX1Now to monitor the maximum in the system three-phase secondary voltage of acquisition；
(2) if open delta voltage U△To reduce, and amount of decrease is not less than 5%, and monitoring open delta voltage is U△2, according to
U△2Adjustment harmonic elimination resistance Rx is not less than R2；And have：
Work as U△2During≤15V, R2=(U△2+100)U△2/3KS；
Conversely,θ=acrcos (U△2/ 100), or：
R2=UMX2U△2/ √ 3KS, UMX2Now to monitor the maximum in the system three-phase secondary voltage of acquisition；
Wherein, K is voltage transformer excitation property voltage multiplication, and S is voltage transformer per mutually specified apparent energy.
In specific implementation：
Voltage transformer open delta voltage U△Can also be the output current I by monitoring voltage transformer open delta
And obtain, U△=IRx.
As voltage transformer open delta voltage U△When being zero, system is in three-phase voltage balance, harmonic elimination resistance Rx values
For 0；When system is in three-phase voltage balance, the change for voltage transformer open delta output current I is monitored, when
When output current I changes, adjustment harmonic elimination resistance Rx is not less than R100, then it is adjusted by step 2 method.
The voltage transformer determined for K values and S values, open delta voltage U△It is some sections according to 0~100V points,
U△DFor the maximum voltage value in each section, harmonic elimination resistance Rx is not less than R corresponding to each sectionD；
For U△≤ 15V section, RD=(U△D+100)U△D/3KS；
Conversely,θ=acrcos (U△D/100)。
System three-phase secondary voltage can carry out voltage monitoring by every phase winding for voltage transformer open delta
And obtain, also, the former is 3 times of the radical sign of the latter.
In addition, pressing present implementation, the voltage transformer for not putting into harmonic elimination resistance in normal operation, work as mutual induction of voltage
Device open delta voltage monitor value U△WWhen meeting or exceeding 15V, adjustment harmonic elimination resistance Rx is not less than RW,
θ=acrcos (U△W/100)。
Appropriate resistance 100% harmonic elimination of energy is put into open delta, is the problem of microcomputer resonance eliminator at present：Single-phase earthing event
Barrier is just the same with the feature of many industrial frequency resonances, cannot be distinguished by fault type, can not put into resistance harmonic elimination, if single-phase earthing
Input harmonic elimination resistance is too small to cause open-triangular winding overload core sataration to trigger new resonance, and single-phase earthing ability
Resonance can be caused.How certainly following discussion is in the case of three-phase imbalance, unbalanced fault (single-phase earthing category unbalanced fault),
Motion tracking adjusts controllable harmonic elimination resistance.
First, for the automatic tracking adjustment of harmonic elimination resistance in the case of single-phase earthing
During the single-phase arc grounding failure of system, open delta is on the one hand set to have power-frequency voltage, many resonance and single-phase earthing
Fault signature is the same, microcomputer resonance eliminator can not be judged industrial frequency resonance and is unable to harmonic elimination；On the other hand single-phase arc light connects
The ground connection of ground sustained intermittent, repeated stock voltage transformer make voltage transformer be easy to resonance again, now prior art
Microcomputer resonance eliminator can not judge and dare not put into harmonic elimination resistance, until accident occurs.
As shown in figure 1, so that single-phase earthing occurs for B phases as an example, Uam, Ubm, Ucm are the phase voltage of open delta three-phase, Ua,
Ub, Uc are that relatively secondary voltage, Uo are that neutral point voltage-to-ground is open delta voltage U to open delta three when B phases are grounded△'s
1/3rd, θ are residual voltage Uo and B phase phase voltages Ubm angle, and B phases are grounded A phase-to-ground voltages Ua maximums, the apparent of A phases
Power is maximum, as long as ensuring that the other two-phases of A phase windings nonoverload would not overload open delta voltage U in open delta△Pass through
Monitoring obtains, in right angled triangle △ OBG：
θ=acrcos (U△/100) (1)
As 60 ° of θ ﹤, as shown in figure 1, in triangle △ OAG, OA and OG be, it is known that OA and OG angle be 120 °+
θ, according to cosine law, it is with the Ua that AG length characterizes：
As 60 ° of θ ﹥, as shown in Fig. 2 in triangle △ OAG, OA and OG, it is known that OA and OG angle is 240 ° of-θ,
And 240 ° of-θ cosine value is equal to 120 ° of+θ cosine value, according to cosine law, the Ua characterized with AG length and formula (2) phase
Together.
When θ=60 °, as shown in figure 3, Ua=50V, is identical with the result calculated by formula (2).
Claims (1)
1. a kind of method of the automatic tracking adjustment of voltage transformer harmonic elimination resistance, it is characterized in that：For not put into normal operation
The voltage transformer of harmonic elimination resistance, as voltage transformer open delta voltage monitor value U△WWhen meeting or exceeding 15V,
It is not less than R to adjust harmonic elimination resistance RxW,
θ=acrcos (U△W/100)；
Wherein, K is voltage transformer excitation property voltage multiplication, S be voltage transformer per mutually specified apparent energy, the harmonic elimination
Resistance Rx is connected across the both ends of voltage transformer open delta.
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| CN201610494535.8A CN105931823B (en) | 2014-10-20 | 2014-10-20 | The method of the automatic tracking adjustment of voltage transformer harmonic elimination resistance |
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| CN201410559081.9A CN104269256B (en) | 2014-10-20 | 2014-10-20 | Voltage transformer disappears the method for the automatic tracking adjustment of humorous resistance |
| CN201610494535.8A CN105931823B (en) | 2014-10-20 | 2014-10-20 | The method of the automatic tracking adjustment of voltage transformer harmonic elimination resistance |
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| CN201410559081.9A Division CN104269256B (en) | 2014-10-20 | 2014-10-20 | Voltage transformer disappears the method for the automatic tracking adjustment of humorous resistance |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106024339B (en) * | 2016-07-21 | 2017-11-24 | 张安斌 | A kind of automatic tracking adjustment method of harmonic elimination resistance |
| CN108987073A (en) * | 2018-08-14 | 2018-12-11 | 国网新疆电力有限公司昌吉供电公司 | Voltage transformer harmonic elimination apparatus and application method |
| CN109510168A (en) * | 2018-12-19 | 2019-03-22 | 国网北京市电力公司 | Mode of connection, the apparatus and system of voltage transformer |
| CN110007261B (en) * | 2019-03-14 | 2024-03-19 | 国网新疆电力有限公司昌吉供电公司 | Device and method for judging fusing of primary side high-voltage fuse of voltage transformer |
| CN115296263B (en) * | 2022-08-19 | 2023-05-16 | 云南电网有限责任公司曲靖供电局 | PID-regulated ferromagnetic resonance elimination method for voltage transformer with active matching resistor |
| CN115411698B (en) * | 2022-09-01 | 2023-04-21 | 云南电网有限责任公司曲靖供电局 | PT ferromagnetic resonance detuning method by actively inputting resistor through electronic load |
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| CN104269256A (en) | 2015-01-07 |
| CN104269256B (en) | 2016-06-01 |
| CN105931823A (en) | 2016-09-07 |
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Application publication date: 20160907 Assignee: HEFEI YIXIN ELECTRIC POWER TECHNOLOGY Co.,Ltd. Assignor: Zhang Anbin Contract record no.: X2021340000010 Denomination of invention: Automatic tracking adjustment method of harmonic elimination resistance of voltage transformer Granted publication date: 20171124 License type: Common License Record date: 20210525 |