CN105092024B - A kind of Winding in Power Transformer axial compression state on_line monitoring method and system - Google Patents
A kind of Winding in Power Transformer axial compression state on_line monitoring method and system Download PDFInfo
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Abstract
The invention discloses a kind of Winding in Power Transformer axial compression state on_line monitoring method and system, this method stablizes the feature that layer line cake intrinsic frequency reduces on the lower winding of component effect according to axial Ampere force, the intrinsic frequency of layer line cake on winding is extracted in the vibration signal of oil tank of transformer upper surface, and axis of winding impaction state deteriorates, i.e. the reduction of pretightning force reduces the intrinsic frequency for leading to winding wire cake, thus realizes that large-scale power transformer axis of winding impaction state is monitored on-line by the variation tendency of tracking observation intrinsic frequency.The system includes vibration signals collecting module, load current acquisition module, analysis and Control module, memory module, output display module, audible alarm module, and vibration signals collecting module, load current acquisition module, memory module, output display module, audible alarm module are connect respectively with analysis and Control module.The present invention has the advantages that physical significance is clear and realization method is simple.
Description
Technical field
The present invention relates to a kind of Winding in Power Transformer axial compression state on_line monitoring method and system, belong to power transmission and transformation
Equipment state on-line intelligence monitoring technical field.
Background technology
Power transformer carry in electric system transformation of electrical energy, network interconnection important function, to the safety of power grid
Stable operation is most important.If transformer winding impaction state deteriorates, axis of winding stability reduction, the punching of winding resistance to shorting electric current
The reduced capability hit.When the electromagnetic force that short circuit current causes is more than the elastic limit of transformer winding material, transformer winding will
Generate expendable plastic deformation namely winding deformation.Winding can be by the alternating electromagnetism of 2 times of fundamental frequencies during transformer station high-voltage side bus
Power.According to the common sense of the mechanics of materials, material can be by fatigue rupture under alternate stress effect, and the maximum stress of fatigue rupture is remote
Less than the tensile strength of winding material, though tiny brittleness slight crack easily occurs without apparent plastic deformation before destroying.According to system
Meter, the loosening deformation of winding are the major failures of transformer, have increased to the first place of accident rate.
Since system of condition monitoring and power transformer are without electrical connection, there is high sensitivity, safe and reliable excellent
Point can preferably detect the machine performance of Winding in Power Transformer and become research hotspot both domestic and external.Wherein, China Power section
It learns research institute, Shanghai Communications University and Shenyang University of Technology etc. and winding pretightning force is studied under power failure state to winding axial vibration
The influence of characteristic measures intrinsic frequency of the transformer winding under power failure state, experiments have shown that winding first natural frequency is not
Stablize component and AC compounent between 100Hz-200Hz is typically under pretightning force, but since axis of winding Ampere force includes,
It is not counted in influence of the analysis pretightning force to transformer winding intrinsic frequency and Ampere force stablizes the influence of component.
Through the retrieval discovery to the prior art：Chinese Patent Application No. is 201110275583.5, and patent name is：It is a kind of
The on-line monitoring method of transformer winding working condition, which acquires the vibration signal of transformer box wall, by comparing tank wall
The size of vibration signal 100Hz component amplitudes and transformer box wall model of vibration desired value differentiates the loosening of winding or becomes shape
State, but 100Hz components do not have the effect of reflection winding intrinsic frequency in transformer vibration signal；Chinese Patent Application No. is
201210193931.9 patent name is：Electrical transformer cores slap fault diagnosis and failure Primary Location system and method,
Although the patent takes the mode for placing 3 vibrating sensors in oil tank of transformer upper surface to measure vibration signal, but the patent
It is the fault diagnosis loosened for realizing transformer core, it is impossible to realize the identification of axis of winding impaction state.
Invention content
The technical problems to be solved by the invention are：A kind of Winding in Power Transformer axial compression state on_line monitoring is provided
Method and system stablize influence of the component to winding intrinsic frequency, from oil tank of transformer vibration signal according to winding Ampere force
The vibration signal of winding wire cake intrinsic frequency is extracted, and transformer winding axial compression shape is monitored according to its frequency changing rule
State.
The present invention uses following technical scheme to solve above-mentioned technical problem：
A kind of Winding in Power Transformer axial compression state on_line monitoring method, including two parts：
The first step does not occur in power transformer load running and to establish spectrum curve peak when axis of winding pretightning force reduces
The frequency values of value and the correspondence library of load current, are as follows：
Step 1, preset sample frequency and sampling time, acquisition power transformer winding under different loads electric current correspond to oil
The vibration signal of case upper surface, and same load current at least samples 3 times；
Step 2, Fourier transform is carried out after the vibration signal noise reduction acquired to step 1, extracts the width of 100Hz oscillating components
Value；
Step 3, in 100Hz~200Hz frequency ranges, the corresponding frequency values of extraction spectrum curve peak value, if frequency spectrum is bent
The corresponding amplitude of line peak value is more than the τ of 100Hz oscillating components1%, τ1For the first threshold values, then record and store the spectrum curve peak
It is worth corresponding frequency values；
Step 4, the frequency values for filtering out with the increase of load current and reducing from the frequency values that step 3 stores, and
Establish the correspondence library of the frequency values and load current；
Second step is in load running to be monitored using whether correspondence library monitoring axis of winding pretightning force reduces
Power transformer on carry out, be as follows：
Step 5, on the power transformer of load running to be monitored, step 1- steps 4 is repeated, are obtained with load current
Increase and the frequency values reduced and the new correspondence library of load current；
Step 6, two correspondence libraries that comparison step 5 is obtained with step 4, if under same load current, in step 5
Corresponding frequency values are less than corresponding frequency values in the correspondence library obtained in step 4, and two in obtained correspondence library
The difference of person is more than fault threshold τ2, then judge that axis of winding pretightning force reduces, otherwise return to step 5.
Preferably, τ described in step 31Value is 0.2.
Preferably, τ described in step 62Value is 0.1Hz.
A kind of Winding in Power Transformer axial compression state on_line monitoring system, including vibration signals collecting module, load
Current acquisition module, analysis and Control module, memory module；
The vibration signals collecting module corresponds to fuel tank for acquiring power transformer winding under different loads electric current
The vibration signal on surface is simultaneously transferred to analysis and Control module；
Load current acquisition module is used to acquire the load current of power transformer and is transferred to analysis and Control module；
Analysis and Control module is used for vibration signal noise reduction and carries out Fourier transform, extracts in 100Hz~200Hz atmosphere
The corresponding frequency values of spectrum curve peak value, and amplitude is more than 100Hz oscillating components τ1Frequency values storage to the storage mould of %
In block, power transformer load running and do not occur pretightning force reduce, power transformer load running and in it is to be monitored this
In the case of two kinds, the correspondence library of the frequency values and load current is established；Compare in above-mentioned two situations, same load current
The corresponding frequency values in two correspondence libraries, when the difference of the two is more than fault threshold, judgement axis of winding pretightning force subtracts
It is small；
Memory module is used to store the load current information of power transformer and analysis and Control module analysis obtains with negative
It is current-carrying increase and reduce frequency values and load current correspondence library information.
Further, which further includes output display module, audible alarm module, the output display module, sound
Alarm module is connect respectively with analysis and Control module.
Preferably, the vibration signals collecting module includes vibration acceleration sensor, vibration signals collecting instrument, described to shake
Dynamic acceleration transducer is connect through vibration signals collecting instrument with analysis and Control module.
Preferably, the load current acquisition module includes Hall current sensor, current signal Acquisition Instrument, the Hall
Current sensor is connect through current signal Acquisition Instrument with analysis and Control module.
The present invention compared with prior art, has following technique effect using above technical scheme：
A kind of Winding in Power Transformer axial compression state on_line monitoring method and system of the present invention, according to axial Ampere force
Stablize the feature that layer line cake intrinsic frequency reduces on the lower winding of component effect, carried in the vibration signal of oil tank of transformer upper surface
The intrinsic frequency of layer line cake on winding is taken, realizes that Winding in Power Transformer is axial by the variation tendency of tracking observation intrinsic frequency
Impaction state is monitored on-line, has the advantages that physical significance is clear and realization method is simple.
Description of the drawings
Fig. 1 is the structure diagram of Winding in Power Transformer axial compression state on_line monitoring system of the present invention.
Fig. 2 is the control flow chart of Winding in Power Transformer axial compression state on_line monitoring method of the present invention.
Fig. 3 is the distribution map of power transformer high-low pressure winding stray field of the present invention.
Fig. 4 is Winding in Power Transformer Ampere force axial direction distribution map of the present invention.
Fig. 5 is the variation that axial Ampere force of the invention stablizes the lower Winding in Power Transformer line cake intrinsic frequency of component effect
Figure.
Fig. 6 (a)-Fig. 6 (d) is under power transformer A phase windings standard pretightning force of the present invention respectively, and load current is
40%th, 60%, 80%, during 100% rated current measuring point rumble spectrum figure.
Fig. 7 (a)-Fig. 7 (d) is under 50% pretightning force of power transformer A phase windings of the present invention respectively, and load current is
40%th, 60%, 80%, during 100% rated current measuring point rumble spectrum figure.
Specific embodiment
Embodiments of the present invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning
Same or similar element is represented to same or similar label eventually or there is the element of same or like function.Below by ginseng
The embodiment for examining attached drawing description is exemplary, and is only used for explaining the present invention, and is not construed as limiting the claims.
The present invention proposes a kind of Winding in Power Transformer axial compression state on_line monitoring method and system, in power transformer
During device normal operation, Fourier analysis is carried out to the fuel tank upper surface vibration signal under transformer different loads electric current, according to axis
Stablize layer line cake intrinsic frequency on the lower winding of component effect to Ampere force to consolidate the feature of reduction, identification transformer upper strata winding
There is frequency, establish the correspondence library of winding intrinsic frequency and load current；Since transformer winding axial compression state deteriorates
Afterwards, line cake intrinsic frequency reduce, according to the variation tendency of transformer winding wire cake intrinsic frequency can be realized power transformer around
Group axial compression state on_line monitoring.
As shown in Figure 1, the implementation system of the present invention includes vibration signals collecting module, load current acquisition module, analysis
Control module, memory module, output display module and sound alarm module.Vibration signals collecting module is sensed by vibration acceleration
Device and vibration signals collecting instrument composition, vibration acceleration sensor are placed on the corresponding fuel tank upper surface of transformer winding, vibrate
The vibration signal that signal sampler sends out pickup gives analyzer-controller module；Load current acquisition module is by Hall current sensor
It is formed with current signal Acquisition Instrument, Hall current sensor acquires the load current of transformer, and the submitting of current signal Acquisition Instrument is adopted
The current signal of collection gives analyzer-controller module；It stands and is connected with power supply (220V) with analysis and Control module, memory module records simultaneously
Current transformer load current is preserved, Fourier is carried out after the signal de-noising that analysis and Control module sends vibration signals collecting instrument
Transformation, extraction 100Hz~200Hz frequency ranges are interior and amplitude is more than 100Hz oscillating component amplitudes τ1The spectrum curve peak value of %
Corresponding frequency values are simultaneously stored into memory module；Analysis and Control module is respectively with exporting display module, audible alarm module phase
Result of calculation is sent to output display module by connection, analysis and Control module.
As shown in Fig. 2, a kind of Winding in Power Transformer axial compression state on_line monitoring method proposed by the present invention, comprising
Following steps：
Step (1)：According to the sample frequency of scheduled vibration signal and sampling time, vibration acceleration sensor pickup electricity
Power transformer winding under different loads electric current corresponds to the vibration signal of fuel tank upper surface, and same load current down-sampling is no less than
3 times；
Oil tank of transformer surface vibration signals under different loads electric current involved in step (1), thus it is negative it is necessary to analyze
It carries the axis of winding Ampere force that electric current generates and stablizes influence of the component to line cake intrinsic frequency.As shown in figure 3, it is power transformer
The distribution map of high-low pressure winding stray field, winding shares 2n-1 layer line cakes in figure.According to the design feature and peace of transformer winding
Train the computing rule of power, axial Ampere force F of the i-th layer line cake under the effect of radial direction leakage field inductionZiIt is represented by
FZi∝kiIσI1(1+cos2ωt) (1)
K in formula (1)iFor coefficient, IσFor the exciting current of leakage field, I1For winding current.By formula (1) it is found that axial Ampere force
FZiTwo parts can be divided into：The stabilization component of Ampere force；The AC compounent (100Hz) of 2 times of fundamental frequencies.Ampere force is stablized component and is made
It during used in transformer winding, is equivalent to and applies step excitation to winding, since transformer winding is the system that has damping, step swashs
Transient response caused by encouraging can decay quickly, and visual Ampere force stabilization component is Static behavior on winding under stable state.
Shown winding Magnetic fluxleakage distribution feature and the walking direction rule of Ampere force can obtain Winding in Power Transformer ampere according to fig. 3
Power axial direction distribution map, as shown in Figure 4.As shown in Figure 4, the axial Ampere force distribution of transformer high-low-voltage winding is consistent, has pair
Claim, reversely the big centre in centripetal and both ends without the characteristics of namely axial Ampere force effect under winding be in inward at both ends compress shape
State.Fig. 5 is the variation diagram that axial Ampere force stablizes the lower Winding in Power Transformer line cake intrinsic frequency of component effect.As shown in Figure 5,
Ampere force is stablized component and is applied to transformer winding, and the intrinsic frequency of two end line cake of winding reduces, the intrinsic frequency of medium line cake
Rate increases.
Step (2)：Fourier transform is carried out after the vibration signal noise reduction sent to vibration signals collecting instrument, extracts 100Hz
The amplitude of oscillating component；
Step (3)：In 100Hz~200Hz frequency ranges, if the amplitude of spectrum curve peak value is more than 100Hz vibrations point
Measure the τ of amplitude1%, τ1For the first threshold values, then record and store the corresponding frequency values of spectrum curve peak value；
Step (3) is related to the selection of the amplitude of spectral range and spectrum curve peak value.Due to transformer under different pretightning forces
The first natural frequency of winding is typically between 100Hz~200Hz.Due to the complexity of transformer device structure, experimental enviroment
Interference and the influence of various nonlinear factors, vibration signal during transformer station high-voltage side bus also divide in addition to 100Hz components other than comprising frequency band
The wider noise signal of cloth, noise is by excitation line cake with its natural frequency vibration.Since transformer winding is in the effect of Ampere force
Its lower intrinsic frequency has certain difference in certain distribution character, i.e., the intrinsic frequency of each layer line cake, thus positioned at lower floor
The vibration signal of the intrinsic frequency of line cake can decay larger during upwardly propagating, and the vibration of oil tank of transformer upper surface passes
What sensor mainly acquired is proximate to the vibration signal of the line cake of sensor.Due to the frequency spectrum in 100Hz~200Hz frequency ranges
There are many peak value of curve, in order to reduce calculation amount, are only more than 100Hz oscillating component amplitudes τ to spectral magnitude1The peak value of % takes it
Frequency values.
Step (4)：The vibration for being filtered out in the frequency values stored from step (3) as load current increases and being reduced is special
Frequency component is levied, and establishes the correspondence library of this feature frequency component and load current；
Step (4) is related to the identification of layer line cake intrinsic frequency in transformer winding.As shown in Figure 5, layer line cake on winding
Intrinsic frequency with winding current increase with reduce feature, and the vibration signal of oil tank of transformer upper surface include upper strata around
The intrinsic frequency of group line cake, and the feature that the frequency increases with load current and reduced, i.e., reduce as load current increases
Vibration performance frequency component be winding wire cake intrinsic frequency.
In power transformer load running, the on-line monitoring for realizing axis of winding impaction state is followed the steps below：
Step (5)：Step (1) to step (4) is repeated, power transformer vibration signal acquisition, processing is carried out, obtains
In 100Hz~200Hz frequency ranges and amplitude is more than 100Hz oscillating component amplitudes τ1The frequency values of the spectrum curve peak value of %,
And it re-establishes as load current increases and the characteristic frequency components reduced and the relationship library of load current；
Step (6)：The characteristic frequency components of step (5) and step (4) foundation and the relationship library of load current are compared, if
Under same load current, corresponding characteristic frequency value is less than corresponding characteristic frequency value in step (4), and frequency in step (5)
Difference is more than fault threshold τ2, τ2For the second threshold values, then judge that axis of winding pretightning force reduces, the bigger winding of frequency-splitting pre-tightens
Power is smaller, i.e. axis of winding impaction state deterioration is more serious, otherwise returns to step (5).
Step (6) is related to the winding pretightning force i.e. monitoring of winding impaction state.Since winding intrinsic frequency is with pretightning force
Increase and reduce, thus after the reduction of winding pretightning force, the component that winding intrinsic frequency is reacted in vibration signal also can accordingly reduce,
The on-line monitoring of winding impaction state can be realized in the variation for tracking layer line cake intrinsic frequency in transformer winding.
It is tested below using specific Power Transformer in Field as embodiment.
It is 110/ to a model SFZ10-31500/110, voltage ratio in Nanjing Liye Power Transformer Co., Ltd.
The transformer that 10.5kV, connection deck label are YNd11 carries out short-circuit test, measures oil tank of transformer under winding difference impaction state
The vibration signal on surface, test connection such as Fig. 1.Acceleration vibrating sensor axial sensitivity is 20pC/g, and maximum transversal is sensitive
Degree is less than 5%, measurement frequency 0.5kHz-12kHz.It is acquired by Buddhist nun's high-tensile strength data collecting instrument, sample frequency 10kHz, often
Secondary sampling 10s.Electric current is acquired using split core type current transformer, transformer output voltage signal is corresponding with tested current signal to close
It is for 1mV/100mA.
It needs to pump to transformer, hang the operating procedures such as cover, loosening during experiment.Using Hydraulic preloader adjust around
Group pretightning force, the pressure that testing transformer screw rod opposite end is enclosed under standard pretightning force are 28MPa, the pressure enclosed by adjusting screw rod opposite end
Strong to change winding impaction state, the pressure set that screw rod opposite end is enclosed under 50% loosening state is 14MPa.Short-circuit test electric current is distinguished
It is set as 40%, 60%, 80%, the 100% of rated current, totally 4 kinds of states.
The corresponding oil of SFZ10-31500/110 power transformer A phase windings is placed on acceleration vibrating sensor below
Case upper surface, setting A phase windings verify the content of present invention for loosening.It is short under power transformer A phase winding standard pretightning forces
Road test is tested as follows：
Step 1：According to the sample frequency of scheduled vibration signal and sampling time, vibration acceleration sensor pickup electric power
Transformer winding under different loads electric current corresponds to the vibration signal of fuel tank upper surface, and same load current down-sampling is no less than 3
It is secondary.
Step 2：Fourier transform is carried out after the vibration signal noise reduction sent to vibration signals collecting instrument, extraction 100Hz shakes
The amplitude of dynamic component, specific measurement result are shown in Table 1.
100Hz oscillating component amplitudes under 1 transformer A phase winding standard pretightning forces of table
| 40% rated current | 60% rated current | 80% rated current | 100% rated current |
| 0.00129g | 0.005046g | 0.008486g | 0.01418g |
Step 3：In 100Hz~200Hz frequency ranges, if the amplitude of spectrum curve peak value is more than 100Hz oscillating components
The 0.2% of amplitude then records and stores the corresponding frequency values of spectrum curve peak value.
Step 4：The vibration performance frequency for being filtered out in the frequency values stored from step 3 as load current increases and being reduced
Rate component, and establish the correspondence library of this feature frequency component and load current.The frequency component of Fig. 6 acceptance of the bid circles is with load
Electric current increases and reduces, and the mapping table of the frequency component and load current is shown in Table 2.
Under 2 transformer A phase winding standard pretightning forces of table, the correspondence of characteristic frequency components and load current
| 40% rated current | 60% rated current | 80% rated current | 100% rated current |
| 128.4Hz | 128.0Hz | 127.7Hz | 127.6Hz |
In power transformer load running, the on-line monitoring for realizing axis of winding impaction state is followed the steps below：
Step 5：Step 1 is repeated to step 4, carries out power transformer vibration signal acquisition, processing, obtain 100Hz~
In 200Hz frequency ranges and amplitude is more than the frequency values of the spectrum curve peak value of 100Hz oscillating components amplitude 0.2%, and again
It establishes as load current increases and the characteristic frequency components reduced and the relationship library of load current.Table 3 is transformer A phase windings
100Hz oscillating component amplitudes under 50% standard pretightning force；The frequency component of Fig. 7 acceptance of the bid circles reduces as load current increases,
The mapping table of the frequency component and load current is shown in Table 4.
100Hz oscillating component amplitudes under 3 transformer A phase windings of table, 50% standard pretightning force
| 40% rated current | 60% rated current | 80% rated current | 100% rated current |
| 0.001957g | 0.007485g | 0.01335g | 0.02153g |
Under 4 transformer A phase windings of table, 50% standard pretightning force, the correspondence of characteristic frequency components and load current
| 40% rated current | 60% rated current | 80% rated current | 100% rated current |
| 122.4Hz | 122.3Hz | 122.2Hz | 121.9Hz |
Step 6：Compare the characteristic frequency components of step 5 and step 4 foundation and the relationship library of load current, i.e. table 2 and table
4.Contrast table 2 and table 4 are it can be seen that the characteristic frequency components under identical short circuit current reduce, thus can be determined that winding loosens.
Above example is merely illustrative of the invention's technical idea, it is impossible to protection scope of the present invention is limited with this, it is every
According to technological thought proposed by the present invention, any change done on the basis of technical solution each falls within the scope of the present invention
Within.
Claims (7)
- A kind of 1. Winding in Power Transformer axial compression state on_line monitoring method, it is characterised in that：Including two parts：The first step does not occur in power transformer load running and to establish spectrum curve peak value when axis of winding pretightning force reduces The correspondence library of frequency values and load current, is as follows：Step 1, preset sample frequency and sampling time, acquisition power transformer winding under different loads electric current are corresponded on fuel tank The vibration signal on surface, and same load current at least samples 3 times；Step 2, Fourier transform is carried out after the vibration signal noise reduction acquired to step 1, extracts the amplitude of 100Hz oscillating components；Step 3, in 100Hz~200Hz frequency ranges, the corresponding frequency values of extraction spectrum curve peak value, if spectrum curve peak It is worth τ of the corresponding amplitude more than the amplitude of 100Hz oscillating components1%, τ1For first threshold, then record and store the spectrum curve The corresponding frequency values of peak value；Step 4, the frequency values for filtering out with the increase of load current and reducing from the frequency values that step 3 stores, and establish The correspondence library of the frequency values and load current；Second step on the power transformer of load running to be monitored, is pre-tightened using correspondence library monitoring axis of winding Whether power reduces, and is as follows：Step 5, on the power transformer of load running to be monitored, step 1- steps 4 is repeated, obtain increasing with load current And the frequency values reduced and the new correspondence library of load current；Step 6, two correspondence libraries that comparison step 5 is obtained with step 4, if under same load current, obtain in step 5 Correspondence library in corresponding frequency values be less than corresponding frequency values in the correspondence library that is obtained in step 4, and the two it Difference is more than fault threshold τ2, then judge that axis of winding pretightning force reduces, otherwise return to step 5.
- 2. Winding in Power Transformer axial compression state on_line monitoring method as described in claim 1, it is characterised in that：Step 3 The τ1Value is 0.2.
- 3. Winding in Power Transformer axial compression state on_line monitoring method as described in claim 1, it is characterised in that：Step 6 The τ2Value is 0.1Hz.
- 4. a kind of Winding in Power Transformer axial compression state on_line monitoring system, it is characterised in that：Including vibration signals collecting Module, load current acquisition module, analysis and Control module, memory module；The vibration signals collecting module corresponds to fuel tank upper surface for acquiring power transformer winding under different loads electric current Vibration signal and be transferred to analysis and Control module；Load current acquisition module is used to acquire the load current of power transformer and is transferred to analysis and Control module；Analysis and Control module is used for vibration signal noise reduction and carries out Fourier transform, extracts frequency spectrum in the range of 100Hz~200Hz The corresponding frequency values of peak of curve, and it is more than the τ of 100Hz oscillating component amplitudes in the corresponding amplitude of spectrum curve peak value1% When, τ1For first threshold, by the corresponding frequency values storage to memory module of the spectrum curve peak value, loaded in power transformer It runs and pretightning force reduction, power transformer load running does not occur and is under both of these case to be monitored, establish the frequency Value and the correspondence library of load current；Compare in above-mentioned two situations, same load current is right in two correspondence libraries The frequency values answered, when the difference of the two is more than fault threshold, judgement axis of winding pretightning force reduces；Memory module be used for store power transformer load current information and analysis and Control module analysis obtain with load electricity The increase of stream and the frequency values and the correspondence library information of load current reduced.
- 5. Winding in Power Transformer axial compression state on_line monitoring system as claimed in claim 4, it is characterised in that：The system Further include output display module, audible alarm module, it is described output display module, audible alarm module respectively with analysis and Control mould Block connects.
- 6. Winding in Power Transformer axial compression state on_line monitoring system as claimed in claim 5, it is characterised in that：It is described to shake Dynamic signal acquisition module includes vibration acceleration sensor, vibration signals collecting instrument, and the vibration acceleration sensor is through vibration Signal sampler is connect with analysis and Control module.
- 7. Winding in Power Transformer axial compression state on_line monitoring system as claimed in claim 5, it is characterised in that：It is described negative It carries current acquisition module and includes Hall current sensor, current signal Acquisition Instrument, the Hall current sensor is through current signal Acquisition Instrument is connect with analysis and Control module.
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| CN106768509A (en) * | 2016-11-22 | 2017-05-31 | 云南电网有限责任公司电力科学研究院 | A kind of adjustable testing transformer of winding stress |
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