CN207798995U - A kind of oscillation wave detection deformation of transformer winding circuit - Google Patents
A kind of oscillation wave detection deformation of transformer winding circuit Download PDFInfo
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- CN207798995U CN207798995U CN201820061545.7U CN201820061545U CN207798995U CN 207798995 U CN207798995 U CN 207798995U CN 201820061545 U CN201820061545 U CN 201820061545U CN 207798995 U CN207798995 U CN 207798995U
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Abstract
This application discloses a kind of oscillation wave detection deformation of transformer winding circuits, 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, form the leakage reactance or excitation impedance oscillation circuit of stray capacitance, capacitance of bushing and first winding to secondary winding over the ground, the three-phase voltage response curve of first winding is measured using waveform measurement analytical equipment, 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 oscillation wave detection transformation
Device winding deformation circuit.
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, it is likely to occur winding deformation phenomenon, 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 intuitive,
Can not rational judgment, need to be by analyzing transformer device structure, operating condition, the data such as routine test measurement result, and combine frequency response
The cross of curve, longitudinal comparison can just make comprehensive descision；Short circuit impedance method is to apply earliest deformation of transformer winding detection side
Method, but winding is slightly deformed and is not easy to find.
Utility model content
In order to solve the problems in the prior art, present applicant proposes a kind of oscillation wave detection deformations of transformer winding to return
Road, loop structure is simple, and detection signal is strong, and deformation of transformer winding accuracy is high, is suitable for deformation of transformer winding latency
Fault detect.
In order to achieve the goal above, technical solution used by the application is：Including DC high-voltage power supply, DC high-voltage
Source is electrically connected to the three-phase neutral point of the first winding of transformer, and short circuit is provided between DC high-voltage power supply and first winding and is opened
It closes, shorting switch one end is electrically connected between DC high-voltage power supply and first winding, other end ground connection；Every phase of the first winding
On be both provided with capacitance of bushing and several stray capacitances over the ground, the end shield of capacitance of bushing per phase is electrically connected with derided capacitors, point
The both ends of voltage capacitance are connected to waveform measurement analytical equipment, and the derided capacitors are grounded；The first winding fills direct current
After pressure, it is closed shorting switch, forms the leakage reactance or excitation reluctance of stray capacitance, capacitance of bushing and first winding to secondary winding over the ground
Resistant and oscillation resistant circuit is measured the three-phase voltage response curve of first winding by waveform measurement analytical equipment, is rung according to three-phase voltage
Curve is answered to judge whether 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 connect 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.
Protective resistance is set between the high voltage direct current generator and shorting switch.
Compared with prior art, three-phase neutral point of the application using DC high-voltage power supply in the first winding of transformer is applied
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 or excitation impedance oscillation circuit of secondary winding, 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, the frequency for comparing three-phase voltage response curve, duration of oscillation, triphasic wave are analyzed
Consistency, 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, is suitable for deformation of transformer winding Hidden fault and detects.
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,
Other drawings may also be obtained based on these drawings.
Fig. 1 is the circuit electrical schematic diagram 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 implementation mode
The application is further explained with reference to specific embodiment and Figure of description.
The drawings herein are incorporated into the specification and forms part of this specification, and shows the implementation for meeting the application
Example, and the principle together with specification for explaining the application.
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below
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, other drawings may also be obtained based on these 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
It is connected to waveform measurement analytical equipment 4, derided capacitors 6 are grounded；First winding LmAfter filling DC voltage, it is closed shorting switch K1, shape
Stray capacitance C in couples1, capacitance of bushing C0With first winding LmLeakage reactance to secondary winding 3 or excitation impedance oscillation circuit lead 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 oscillation of leakage reactance or excitation impedance oscillation circuit to secondary winding 3
When wave duration is less than 3 periods, the first winding L of transformer 7mThree-phase head end be electrically connected with compensating electric capacity 5, compensate
One end of capacitance 5 is grounded.
If forming 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.
Ground is advanced optimized, DC high-voltage power supply includes the high voltage direct current generator 1 being connect 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 be 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 setting protective resistance R.
In addition, utilizing transformer leakage reactance or excitation impedance and condenser bushing capacitance, winding stray capacitance over the ground and outer
Add the oscillation circuit constituted between compensating electric capacity, detects deformation of transformer winding.DC voltage is applied into point in first winding head
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.
The application is hanging by star winding of transformer or accesses the compensating electric capacity of ground connection, 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, to detect deformation of transformer winding.The application is simple with test loop, detection signal is strong, voltage is high
And accuracy it is high the features such as, be 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
The secondary winding 3 in resistant and oscillation resistant circuit, transformer 7 passes 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 be arranged 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
Magnetoimpedance oscillation circuit, secondary winding 3 do not need short circuit, the first winding L of transformer 7mThree-phase neutral point connection direct current it is high
Generator 1, high voltage direct current generator 1 is pressed to be grounded, high voltage direct current generator 1 and shorting switch K1Between be arranged 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.
The method that oscillation wave detects deformation of transformer winding, includes 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 be arranged 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 oscillation wave duration of leakage reactance or excitation impedance oscillation circuit to secondary winding 3 is less than 3 periods, 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 being formed in method spuious over the ground
Capacitance C1, capacitance of bushing C0With first winding LmWhen 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 to secondary winding 3 or excitation impedance oscillation circuit, 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 consistency of three-phase waveform, variance and inequality etc. and judges whether transformer winding deforms.
The application is in the stray capacitance over the ground using transformer winding leakage reactance or excitation impedance and condenser bushing and winding
On the basis of constituting 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 constitute.
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 constituted 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 suitable for deformation of transformer winding Hidden fault and detects.
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 include not only those elements, but also include being not explicitly listed
Other element, or further include for elements inherent to such a process, method, article, or device.
The above is only the specific implementation mode of the application, is made skilled artisans appreciate that or realizing this Shen
Please.Various modifications to these embodiments will be apparent to one skilled in the art, as defined herein
General Principle can in other embodiments be realized in the case where not departing from spirit herein or range.Therefore, the application
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest range caused.
It should be understood that the application is not limited to the content for being described above and being shown in the accompanying drawings, and can
To carry out various modifications and change without departing from the scope.Scope of the present application is only limited by the accompanying claims.
Claims (8)
1. a kind of oscillation wave 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 be arranged
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.
2. a kind of oscillation wave 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.
3. a kind of oscillation wave 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.
4. a kind of oscillation wave 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 oscillation wave detection deformation of transformer winding of claim 1-4 any one of them circuit, 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 oscillation wave detection deformation of transformer winding of claim 1-4 any one of them circuit, which is characterized in that
The DC high-voltage power supply includes the high voltage direct current generator (1) being connect 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.
7. a kind of oscillation wave 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.
8. a kind of oscillation wave detection deformation of transformer winding circuit according to claim 7, which is characterized in that the direct current
High pressure generator (1) and shorting switch (K1) between setting protective resistance (R).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820061545.7U CN207798995U (en) | 2018-01-15 | 2018-01-15 | A kind of oscillation wave detection deformation of transformer winding circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820061545.7U CN207798995U (en) | 2018-01-15 | 2018-01-15 | A kind of oscillation wave detection deformation of transformer winding circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108120895A (en) * | 2018-01-15 | 2018-06-05 | 云南电网有限责任公司电力科学研究院 | A kind of wave of oscillation detection deformation of transformer winding circuit and method |
-
2018
- 2018-01-15 CN CN201820061545.7U patent/CN207798995U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108120895A (en) * | 2018-01-15 | 2018-06-05 | 云南电网有限责任公司电力科学研究院 | A kind of wave of oscillation detection deformation of transformer winding circuit and method |
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