CN108120895A - A kind of wave of oscillation detection deformation of transformer winding circuit and method - Google Patents
A kind of wave of oscillation detection deformation of transformer winding circuit and method Download PDFInfo
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- CN108120895A CN108120895A CN201810035485.6A CN201810035485A CN108120895A CN 108120895 A CN108120895 A CN 108120895A CN 201810035485 A CN201810035485 A CN 201810035485A CN 108120895 A CN108120895 A CN 108120895A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/72—Testing of electric windings
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Abstract
This application discloses a kind of wave of oscillation detection deformation of transformer winding circuit and methods, circuit includes DC high-voltage power supply, DC high-voltage power supply is electrically connected to the three-phase neutral point of the first winding of transformer, shorting switch is provided between DC high-voltage power supply and first winding, shorting switch one end is electrically connected between DC high-voltage power supply and first winding, other end ground connection；The end shield of the capacitance of bushing of every phase of first winding is electrically connected with derided capacitors, and the both ends of derided capacitors are connected to waveform measurement analytical equipment, and derided capacitors are grounded.The application is closed ground connection using shorting switch, formed over the ground stray capacitance, capacitance of bushing and first winding to the leakage reactance of secondary winding or excitation impedance oscillation circuit, using the three-phase voltage response curve of waveform measurement analytical equipment measurement first winding, analysis compares three-phase voltage response curve and judges whether transformer winding deforms.The application is detected suitable for deformation of transformer winding Hidden fault.
Description
Technical field
This application involves the technical fields of transformer winding state assessment detection, and in particular to a kind of wave of oscillation detects transformation
Device winding deformation circuit and method.
Background technology
The axially or radially change in size that Winding in Power Transformer occurs under mechanical force or electrodynamic action usually shows
For features such as winding bird caging, bulge or displacements.Transformer is collided in by short-circuit current rush or transportational process
When, winding deformation phenomenon is likely to occur, it will directly affect the safe operation of transformer.According to statistics, 110kV and to power on
The slightly deformed Hidden fault of power transformer winding, be cause power transformer damage and the main reason for electric network fault it
One.Existing winding deformation, which predominantly detects method, method of frequency response method, impedance method, method of frequency response method measurement voltage is low, measurement result is not directly perceived,
Can not rational judgment, need to be by analyzing the data such as transformer device structure, operating condition, routine test measurement result, and with reference to frequency response
The horizontal stroke of curve, longitudinal comparison can just make comprehensive descision；Short circuit impedance method is using earliest deformation of transformer winding detection side
Method, but slightly deformed for winding and be not easy to find.
The content of the invention
In order to solve the problems in the prior art, present applicant proposes a kind of wave of oscillation detection deformation of transformer winding circuits
And method, loop structure is simple, and detection signal is strong, and deformation of transformer winding accuracy is high, dives suitable for deformation of transformer winding
The fault detect of volt property.
In order to achieve the goal above, technical solution is used by the application：
A kind of wave of oscillation detection deformation of transformer winding circuit, including DC high-voltage power supply, DC high-voltage power supply electrical connection
To the three-phase neutral point of the first winding of transformer, shorting switch is provided between DC high-voltage power supply and first winding, short circuit is opened
It closes one end to be electrically connected between DC high-voltage power supply and first winding, other end ground connection；It is respectively provided in every phase of the first winding
There are capacitance of bushing and several stray capacitances over the ground, the end shield of the capacitance of bushing per phase is electrically connected with derided capacitors, derided capacitors
Both ends are connected to waveform measurement analytical equipment, and the derided capacitors are grounded；After the first winding fills DC voltage, it is closed
Shorting switch, stray capacitance, capacitance of bushing and first winding vibrate back the leakage reactance or excitation impedance of secondary winding over the ground for formation
Road is measured the three-phase voltage response curve of first winding by waveform measurement analytical equipment, is sentenced according to three-phase voltage response curve
Whether disconnected transformer winding deforms.
The first winding of the transformer is star winding.
The three-phase head end of the first winding of the transformer is hanging.
The three-phase head end of the first winding of the transformer is electrically connected with compensating electric capacity, one end ground connection of compensating electric capacity.
The secondary winding of the transformer passes through short circuit conducting wire short circuit.
The DC high-voltage power supply includes the high voltage direct current generator being connected with power supply, and high voltage direct current generator is electrically connected to
The three-phase neutral point of the first winding of transformer, high voltage direct current generator ground connection, shorting switch one end is electrically connected to high direct voltage
Between generator and first winding.
The high voltage direct current generator connects 220V AC powers, and protection is set between high voltage direct current generator and shorting switch
Resistance.
A kind of method of wave of oscillation detection deformation of transformer winding, including：
DC high-voltage power supply is electrically connected to the three-phase neutral point of the first winding of transformer first, by shorting switch one end
It is electrically connected between DC high-voltage power supply and first winding, other end ground connection, partial pressure is electrically connected in the end shield of the capacitance of bushing of every phase
Capacitance, and derided capacitors are grounded, waveform measurement analytical equipment connects the both ends of derided capacitors；
Then DC voltage is filled to first winding by DC high-voltage power supply, control shorting switch is closed, is formed miscellaneous over the ground
Spurious capacitance, capacitance of bushing and first winding analyze the leakage reactance of secondary winding or excitation impedance oscillation circuit by waveform measurement
Device measures the three-phase voltage response curve of first winding；
The three-phase voltage response curve finally obtained according to measurement, analysis compare the frequency of three-phase voltage response curve, shake
It swings time, the uniformity of three-phase waveform, variance and inequality and judges whether transformer winding deforms.
The three-phase head end of the first winding of transformer is hanging in the method；Or stray capacitance, capacitance of bushing over the ground
When being less than 3 cycles to the leakage reactance of secondary winding or the vibration wave duration of excitation impedance oscillation circuit with first winding, become
The three-phase head end of the first winding of depressor is electrically connected compensating electric capacity, one end ground connection of compensating electric capacity.
If being formed in the method, stray capacitance, capacitance of bushing and first winding vibrate back the leakage reactance of secondary winding over the ground
Lu Shi, the secondary winding of transformer pass through short circuit conducting wire short circuit.
Compared with prior art, the application is applied using three-phase neutral point of the DC high-voltage power supply in the first winding of transformer
Add DC high-voltage, and shorting switch is set between DC high-voltage power supply and first winding, shorting switch one end is electrically connected to directly
It flows between high voltage power supply and first winding, shorting switch other end ground connection is closed using shorting switch and is grounded, forms stray electrical over the ground
Hold, capacitance of bushing and first winding are to the leakage reactance of secondary winding or excitation impedance oscillation circuit, the end shield of the capacitance of bushing per phase
Derided capacitors are electrically connected with, the both ends of derided capacitors are connected to waveform measurement analytical equipment, utilize waveform measurement analytical equipment
The three-phase voltage response curve of first winding is measured, analyzes the frequency for comparing three-phase voltage response curve, duration of oscillation, triphasic wave
Uniformity, variance and the inequality of shape judge whether transformer winding deforms, the test loop of the application is simple, detection signal is strong,
Have the characteristics that voltage is high and accuracy is high, detected suitable for deformation of transformer winding Hidden fault.
Description of the drawings
In order to illustrate more clearly of the technical solution of the application, letter will be made to attached drawing needed in the embodiment below
Singly introduce, it should be apparent that, for those of ordinary skills, without having to pay creative labor,
It can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is the circuit electrical schematic diagram of the application；
Fig. 2 is the detection method flow chart of the application；
Wherein, 1- high voltage direct current generators, 2- short circuits conducting wire, 3- secondary windings, 4- waveform measurements analytical equipment, 5- compensation
Capacitance, 6- derided capacitors, 7- transformers, R are protective resistance, K1For shorting switch, C0For capacitance of bushing, C1For stray electrical over the ground
Hold, LmFor first winding.
Specific embodiment
The application is further explained with reference to specific embodiment and Figure of description.
Attached drawing herein is merged in specification and forms the part of this specification, shows the implementation for meeting the application
Example, and for explaining the principle of the application together with specification.
It in order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described, it should be apparent that, for those of ordinary skill in the art
Speech, without having to pay creative labor, can also be obtained according to these attached drawings other attached drawings.
Referring to Fig. 1, the application includes DC high-voltage power supply, and DC high-voltage power supply is electrically connected to the first winding of transformer 7
LmThree-phase neutral point, DC high-voltage power supply and first winding LmBetween be provided with shorting switch K1, shorting switch K1One end is electrically connected
To DC high-voltage power supply and first winding LmBetween, other end ground connection；First winding LmEvery phase on be both provided with capacitance of bushing C0With
Several stray capacitance C over the ground1, the capacitance of bushing C per phase0End shield be electrically connected with derided capacitors 6, the both ends of derided capacitors 6 connect
Waveform measurement analytical equipment 4 is connected to, derided capacitors 6 are grounded；First winding LmAfter filling DC voltage, shorting switch K is closed1, shape
Stray capacitance C in couples1, capacitance of bushing C0With first winding LmLeakage reactance or excitation impedance oscillation circuit to secondary winding 3 are led to
It crosses waveform measurement analytical equipment 4 and measures first winding LmThree-phase voltage response curve, according to three-phase voltage response curve judge
Whether transformer winding deforms.
The first winding L of transformer 7mFor star winding, the first winding L of transformer 7mThree-phase head end it is hanging；Or
Stray capacitance C over the ground1, capacitance of bushing C0With first winding LmThe vibration of leakage reactance or excitation impedance oscillation circuit to secondary winding 3
When wave duration is less than 3 cycles, the first winding L of transformer 7mThree-phase head end be electrically connected with compensating electric capacity 5, compensate
One end ground connection of capacitance 5.
If form stray capacitance C over the ground1, capacitance of bushing C0With first winding LmTo the leakage reactance oscillation circuit of secondary winding 3
When, the secondary winding 3 of transformer 7 passes through 2 short circuit of short circuit conducting wire.
Further optimally, DC high-voltage power supply includes the high voltage direct current generator 1 being connected with power supply, and high direct voltage occurs
Device 1 is electrically connected to the first winding L of transformer 7mThree-phase neutral point, high voltage direct current generator 1 is grounded, shorting switch K1One end
It is electrically connected to high voltage direct current generator 1 and first winding LmBetween.High voltage direct current generator 1 connects 220V AC powers.Direct current is high
Press generator 1 and shorting switch K1Between protective resistance R is set.
In addition, utilize transformer leakage reactance or excitation impedance and condenser bushing capacitance, winding stray capacitance over the ground and outer
Add the oscillation circuit formed between compensating electric capacity, detect deformation of transformer winding.It is first in first winding that DC voltage is applied into point
End, by two shorting switch, i.e., first disconnects high direct voltage circuit, then is connected in the first winding neutral conductor and ground, also can
Realize the detection of deformation of transformer winding.
Star winding of transformer vacantly or is accessed the compensating electric capacity being grounded by the application, and secondary winding short circuit is becoming
It is grounded rapidly after applying DC voltage on depressor star winding neutral-point connecting wire, the voltage responsive waveform of measuring loop,
By high voltage direct current generator 1, protective resistance R, shorting switch K1And waveform measurement analytical equipment 4, compensating electric capacity 5, derided capacitors 6
Deng composition.By measuring first winding three-phase voltage waveform, and carry out frequency, amplitude, duration of oscillation, correlation laterally, longitudinal
The comparative analysis such as degree, so as to detect deformation of transformer winding.The application is with test loop is simple, detection signal is strong, voltage is high
And accuracy it is high the features such as, suitable for deformation of transformer winding fault detect.
Embodiment 1：The stray capacitance C over the ground of transformer 71, capacitance of bushing C0With first winding LmLeakage to secondary winding 3
Resistant and oscillation resistant circuit, the secondary winding 3 of transformer 7 pass through 2 short circuit of short circuit conducting wire, the first winding L of transformer 7mThree-phase it is neutral
Point connection high voltage direct current generator 1, high voltage direct current generator 1 are grounded, high voltage direct current generator 1 and shorting switch K1Between set protect
Protect resistance R, shorting switch K1One end is electrically connected to high voltage direct current generator 1 and first winding LmBetween, other end ground connection, direct current height
Generator 1 is pressed to connect 220V AC powers.The first winding L of transformer 7mThree-phase head end is hanging or transformer 7 one
Secondary winding LmThree-phase head end be electrically connected with compensating electric capacity 5, one end ground connection of compensating electric capacity 5.First winding LmEvery phase set
Pipe capacitance C0End shield be electrically connected with derided capacitors 6, the both ends of derided capacitors 6 are connected to waveform measurement analytical equipment 4, partial pressure
Capacitance 6 is grounded.
Embodiment 2：The stray capacitance C over the ground of transformer 71, capacitance of bushing C0With first winding LmTo encouraging for secondary winding 3
Short circuit, the first winding L of transformer 7 is not required in magnetoimpedance oscillation circuit, secondary winding 3mThree-phase neutral point connection direct current it is high
Generator 1 is pressed, high voltage direct current generator 1 is grounded, high voltage direct current generator 1 and shorting switch K1Between set protective resistance R, short circuit
Switch K1One end is electrically connected to high voltage direct current generator 1 and first winding LmBetween, other end ground connection, high voltage direct current generator 1 connects
220V AC powers.The first winding L of transformer 7mThree-phase head end is hanging or the first winding L of transformer 7mThree-phase
Head end is electrically connected with compensating electric capacity 5, one end ground connection of compensating electric capacity 5.First winding LmEvery phase capacitance of bushing C0End shield
Derided capacitors 6 are electrically connected with, the both ends of derided capacitors 6 are connected to waveform measurement analytical equipment 4, and derided capacitors 6 are grounded.
Referring to the method that Fig. 2, the wave of oscillation detect deformation of transformer winding, comprise the following steps：
High voltage direct current generator 1 connects 220V AC powers first, and high voltage direct current generator 1 is electrically connected to transformer 7
First winding LmThree-phase neutral point, by shorting switch K1One end is electrically connected to high voltage direct current generator 1 and first winding LmBetween,
The other end is grounded, high voltage direct current generator 1 and shorting switch K1Between set protective resistance R, in the capacitance of bushing C of every phase0End shield
Derided capacitors 6 are electrically connected, and derided capacitors 6 are grounded, waveform measurement analytical equipment 4 connects the both ends of derided capacitors 6；In method
The first winding L of transformer 7mThree-phase head end it is hanging；Or stray capacitance C over the ground1, capacitance of bushing C0With first winding Lm
When the vibration wave duration of leakage reactance or excitation impedance oscillation circuit to secondary winding 3 is less than 3 cycles, the one of transformer 7
Secondary winding LmThree-phase head end be electrically connected compensating electric capacity 5, one end ground connection of compensating electric capacity 5.If it is formed in method spuious over the ground
Capacitance C1, capacitance of bushing C0With first winding LmDuring to the leakage reactance oscillation circuit of secondary winding 3, the secondary winding 3 of transformer 7 is logical
Cross 2 short circuit of short circuit conducting wire；
Then by high voltage direct current generator 1 to first winding LmFill DC voltage, control shorting switch K1It is closed, is formed
Stray capacitance C over the ground1, capacitance of bushing C0With first winding LmLeakage reactance or excitation impedance oscillation circuit to secondary winding 3, pass through
Waveform measurement analytical equipment 4 measures first winding LmThree-phase voltage response curve；
The three-phase voltage response curve finally obtained according to measurement, analysis compare the frequency of three-phase voltage response curve, shake
It swings time, the uniformity of three-phase waveform, variance and inequality etc. and judges whether transformer winding deforms.
The application is utilizing transformer winding leakage reactance or excitation impedance and the stray capacitance over the ground of condenser bushing and winding
On the basis of forming ferromagnetic oscillation test winding deformation principle, by applying direct current in transformer star winding neutral-point connecting wire
After voltage by its it is rapid be grounded, the voltage responsive waveform of measuring loop, circuit is by high voltage direct current generator 1, protective resistance R, short
Meet switch K1, short circuit conducting wire 2, waveform measurement analytical equipment 4, compensating electric capacity 5 and derided capacitors 6 form.
The application, which dexterously utilizes, utilizes transformer leakage reactance or excitation impedance and the stray electrical of condenser bushing, winding over the ground
The oscillation circuit formed between appearance and additional compensating electric capacity, by applying direct current in transformer star winding neutral-point connecting wire
After pressure by its it is rapid be grounded, the voltage responsive waveform of measuring loop, have that test loop is simple, detection signal is strong, voltage is high and
The features such as accuracy is high is detected suitable for deformation of transformer winding Hidden fault.
It should be noted that such as term " comprising " or any other variant thereof is intended to cover non-exclusive inclusion,
So that article or equipment including a series of elements not only include those elements, but also including being not explicitly listed
It other element or further includes as elements inherent to such a process, method, article, or device.
The above is only the specific embodiment of the application, is made skilled artisans appreciate that or realizing this Shen
Please.A variety of modifications of these embodiments will be apparent to one skilled in the art, it is as defined herein
General Principle can in other embodiments be realized in the case where not departing from spirit herein or scope.Therefore, the application
The embodiments shown herein is not intended to be limited to, and is to fit to and the principles and novel features disclosed herein phase one
The most wide scope caused.
It should be appreciated that the content that the application is not limited to be described above and be shown in the drawings, and can
To carry out various modifications and change without departing from the scope.Scope of the present application is only limited by appended claim.
Claims (10)
1. a kind of wave of oscillation detection deformation of transformer winding circuit, which is characterized in that including DC high-voltage power supply, DC high-voltage
Source is electrically connected to the first winding (L of transformer (7)m) three-phase neutral point, DC high-voltage power supply and first winding (Lm) between set
There is shorting switch (K1), shorting switch (K1) one end is electrically connected to DC high-voltage power supply and first winding (Lm) between, another termination
Ground；First winding (the Lm) every phase on be both provided with capacitance of bushing (C0) and several stray capacitance (C over the ground1), the set per phase
Pipe capacitance (C0) end shield be electrically connected with derided capacitors (6), the both ends of derided capacitors (6) are connected to waveform measurement analytical equipment
(4), the derided capacitors (6) are grounded；First winding (the Lm) fill DC voltage after, be closed shorting switch (K1), formation pair
Ground stray capacitance (C1), capacitance of bushing (C0) and first winding (Lm) leakage reactance or excitation impedance of secondary winding (3) are vibrated back
Road measures first winding (L by waveform measurement analytical equipment (4)m) three-phase voltage response curve, responded according to three-phase voltage
Curve judges whether transformer winding deforms.
A kind of 2. wave of oscillation detection deformation of transformer winding circuit according to claim 1, which is characterized in that the transformation
First winding (the L of device (7)m) it is star winding.
A kind of 3. wave of oscillation detection deformation of transformer winding circuit according to claim 1, which is characterized in that the transformation
First winding (the L of device (7)m) three-phase head end it is hanging.
A kind of 4. wave of oscillation detection deformation of transformer winding circuit according to claim 1, which is characterized in that the transformation
First winding (the L of device (7)m) three-phase head end be electrically connected with compensating electric capacity (5), one end ground connection of compensating electric capacity (5).
5. according to a kind of wave of oscillation detection deformation of transformer winding circuit of claim 1-4 any one of them, which is characterized in that
The secondary winding (3) of the transformer (7) passes through short circuit conducting wire (2) short circuit.
6. according to a kind of wave of oscillation detection deformation of transformer winding circuit of claim 1-4 any one of them, which is characterized in that
The DC high-voltage power supply includes the high voltage direct current generator (1) being connected with power supply, and high voltage direct current generator (1) is electrically connected to change
First winding (the L of depressor (7)m) three-phase neutral point, high voltage direct current generator (1) ground connection, shorting switch (K1) one end electrical connection
To high voltage direct current generator (1) and first winding (Lm) between.
A kind of 7. wave of oscillation detection deformation of transformer winding circuit according to claim 6, which is characterized in that the direct current
High pressure generator (1) connects 220V AC powers, high voltage direct current generator (1) and shorting switch (K1) between protective resistance is set
(R)。
A kind of 8. method of wave of oscillation detection deformation of transformer winding, which is characterized in that including：
DC high-voltage power supply is electrically connected to the first winding (L of transformer (7) firstm) three-phase neutral point, by shorting switch
(K1) one end is electrically connected to DC high-voltage power supply and first winding (Lm) between, other end ground connection, in the capacitance of bushing (C of every phase0)
End shield electrical connection derided capacitors (6), and derided capacitors (6) are grounded, waveform measurement analytical equipment (4) connection derided capacitors (6)
Both ends；
Then by DC high-voltage power supply to first winding (Lm) fill DC voltage, control shorting switch (K1) be closed, it is formed over the ground
Stray capacitance (C1), capacitance of bushing (C0) and first winding (Lm) to the leakage reactance of secondary winding (3) or excitation impedance oscillation circuit,
First winding (L is measured by waveform measurement analytical equipment (4)m) three-phase voltage response curve；
The three-phase voltage response curve finally obtained according to measurement, when the frequency of three-phase voltage response curve, vibration are compared in analysis
Between, the uniformity of three-phase waveform, variance and inequality judge whether transformer winding deforms.
9. according to the method described in claim 8, it is characterized in that, in the method transformer (7) first winding (Lm) three
Phase head end is hanging；Or stray capacitance (C over the ground1), capacitance of bushing (C0) and first winding (Lm) leakage to secondary winding (3)
When anti-or excitation impedance oscillation circuit the vibration wave duration is less than 3 cycles, the first winding (L of transformer (7)m) three
Phase head end is electrically connected compensating electric capacity (5), one end ground connection of compensating electric capacity (5).
10. according to the method described in claim 8, it is characterized in that, if stray capacitance (C over the ground is formed in the method1), set
Pipe capacitance (C0) and first winding (Lm) to the leakage reactance oscillation circuit of secondary winding (3) when, the secondary winding (3) of transformer (7) is logical
Cross short circuit conducting wire (2) short circuit.
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| CN201810035485.6A CN108120895A (en) | 2018-01-15 | 2018-01-15 | A kind of wave of oscillation detection deformation of transformer winding circuit and method |
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| CN201810035485.6A CN108120895A (en) | 2018-01-15 | 2018-01-15 | A kind of wave of oscillation detection deformation of transformer winding circuit and method |
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| CN109141218A (en) * | 2018-11-06 | 2019-01-04 | 云南电网有限责任公司电力科学研究院 | A kind of deformation of transformer winding detection method |
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| CN110161381B (en) * | 2019-04-29 | 2021-04-13 | 云南电网有限责任公司电力科学研究院 | Transformer bushing insulation damp state evaluation method based on oscillation waves |
| CN110376454A (en) * | 2019-06-23 | 2019-10-25 | 西南交通大学 | Winding radial deformation and oscillation wave relevance research platform and its test method |
| CN110361610A (en) * | 2019-06-23 | 2019-10-22 | 西南交通大学 | Transformer winding radial deformation test macro and its test appraisal procedure |
| CN110376454B (en) * | 2019-06-23 | 2024-04-26 | 西南交通大学 | Research platform for relevance of radial deformation of winding and oscillatory wave and test method thereof |
| CN111610469A (en) * | 2020-04-21 | 2020-09-01 | 中国电力科学研究院有限公司 | Three-phase synchronous frequency response detection method and system for star-connected transformer winding deformation |
| CN111610469B (en) * | 2020-04-21 | 2023-05-16 | 中国电力科学研究院有限公司 | Three-phase synchronous frequency response detection method and system for star transformer winding deformation |
| CN113484801A (en) * | 2021-07-15 | 2021-10-08 | 杭州电力设备制造有限公司 | Method, device, equipment and medium for detecting transformer winding state |
| CN116593941A (en) * | 2023-05-08 | 2023-08-15 | 安徽大学 | Traction transformer winding radial cumulative deformation simulation device and diagnosis method thereof |
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