CN108333439A - A kind of bushing shell for transformer dielectric loss and capacitance monitor system - Google Patents
A kind of bushing shell for transformer dielectric loss and capacitance monitor system Download PDFInfo
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- CN108333439A CN108333439A CN201810233339.4A CN201810233339A CN108333439A CN 108333439 A CN108333439 A CN 108333439A CN 201810233339 A CN201810233339 A CN 201810233339A CN 108333439 A CN108333439 A CN 108333439A
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- current signal
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- dielectric loss
- capacitance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2688—Measuring quality factor or dielectric loss, e.g. loss angle, or power factor
- G01R27/2694—Measuring dielectric loss, e.g. loss angle, loss factor or power factor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2605—Measuring capacitance
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- Engineering & Computer Science (AREA)
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- Testing Relating To Insulation (AREA)
Abstract
The present invention provides a kind of bushing shell for transformer dielectric loss and capacitance to monitor system, and it is the technical issues of being difficult to overcome to solve the drift of, circuit higher to the stability requirement of hardware circuit itself and the influence of harmonic wave interference existing for the technology of the existing phase difference for obtaining and seeking two fundamental frequency current signals.
Description
Technical field
The present invention relates to transformer monitoring fields more particularly to a kind of bushing shell for transformer dielectric loss and capacitance to monitor system.
Background technology
With the development of science and technology, electric power has become one of most important resource, how to ensure the reliable supply of electric power for
The national economic development and the raising of living standards of the people have very important meaning.
Casing is widely used in the electric power for electric current being introduced or being drawn the metal shells such as transformer in electric system and sets
It is standby, while playing the role of mechanical support.Realize the on-line monitoring of bushing shell for transformer dielectric loss parameter, most critical technology be as
What accurately obtains and seeks the phase difference of two fundamental frequency current signals.It is built upon at analog signal used by early stage
" Zero-cross comparator " technology on the basis of reason obtains the time difference of two signals by counter type, then further according to signal week
Phase is converted into phase difference, but the technology of the existing phase difference for obtaining and seeking two fundamental frequency current signals is existing to hard
The stability requirement of part circuit is higher, circuit itself drift and the influence of harmonic wave interference are the technical issues of being difficult to overcome.
It is therefore proposed that a kind of bushing shell for transformer dielectric loss and capacitance monitoring system are to solve existing acquisition and seek two
The drift of itself of higher to the stability requirement of hardware circuit existing for the technology of the phase difference of fundamental frequency current signal, circuit
Influence with harmonic wave interference is the technical issues of being difficult to overcome.
Invention content
The present invention provides a kind of bushing shell for transformer dielectric loss and capacitance to monitor system, solves existing acquisition and seeks
, circuit higher to the stability requirement of hardware circuit itself existing for the technology of the phase difference of two fundamental frequency current signals
Drift and the influence of harmonic wave interference are the technical issues of being difficult to overcome.
The present invention provides a kind of bushing shell for transformer dielectric loss and capacitance to monitor system, including：
Outlet of bushing shell for transformer, the bushing shell for transformer is connect with busbar；
Casing Detection unit is grounded with the end shield of the bushing shell for transformer and connects, is used for and reference voltage detection unit
The earth current signal of Transformer Bushing Tap described in synchronous acquisition, and the earth current signal is carried out at Fourier transformation
Reason, obtains the amplitude and phase of the earth current signal, is sent out the amplitude of the earth current signal and phase by bus
It send to on-line monitoring host；
The reference voltage detection unit, connect with the busbar, is used for and described sleeve pipe detection unit synchronous acquisition institute
The voltage signal of busbar is stated, and the voltage signal of the busbar is converted to the current signal of the busbar, then to the busbar
Current signal carry out Fourier transformation processing, the amplitude and phase of the current signal of the busbar are obtained, by bus by institute
It states the amplitude of the current signal of busbar and phase is sent to on-line monitoring host；
The on-line monitoring host, the electric current of amplitude and phase and the busbar for receiving the earth current signal
Signal amplitude and phase, according to the amplitude of the earth current signal and the amplitude and phase of the current signal of phase and the busbar
Position is detected bushing shell for transformer dielectric loss and capacitance；
The on-line checking host specifically includes：
Receiving module, the width of amplitude and the current signal of phase and the busbar for receiving the earth current signal
Value and phase；
Dielectric loss value computing module is used for the phase of the current signal of the phase and busbar according to the earth current signal
Position, calculates the dielectric loss value of the bushing shell for transformer；
Capacitance computing module is used for the width of the current signal of the amplitude and busbar according to the earth current signal
Value, calculates the capacitance of the bushing shell for transformer.
Preferably, the on-line monitoring host further includes：
Dielectric loss value comparison module is connect with the dielectric loss value computing module, is used for the dielectric loss value of the bushing shell for transformer
It is compared with preset initial dielectric loss value, obtains dielectric loss value variable quantity；
First alarm module is connect with the dielectric loss value comparison module, for when the dielectric loss value variable quantity is higher than preset
First threshold sends out the first warning message.
Preferably, the on-line monitoring host further includes：
Capacitance comparison module is connect with the capacitance computing module, is used for the capacitance of the bushing shell for transformer
It is compared with preset initial capacitance, obtains electric capacitance change amount；
Second alarm module is connect with the capacitance comparison module, for when the electric capacitance change amount is higher than preset
When second threshold, the second warning message is sent out.
Preferably, the on-line monitoring host further includes：
Data memory module, the historical data for storing the bushing shell for transformer；
Data inputting module, other data of the bushing shell for transformer for receiving host computer transmission；
Threshold setting module is connect with the data memory module, the data inputting module respectively, for according to
The historical data of bushing shell for transformer and other data, determine the preset first threshold and the preset second threshold, and by institute
It states preset first threshold and is sent to first alarm module, the preset second threshold is sent to second alarm module.
Preferably, a kind of bushing shell for transformer dielectric loss provided by the invention and capacitance monitoring system further include：
Bottom shielding of bushing adapter, described sleeve pipe end shield adapter is set to the end shield of the bushing shell for transformer, for drawing
The earth current signal of the Transformer Bushing Tap；
Described sleeve pipe detection unit is connect with described sleeve pipe end shield adapter.
Preferably, a kind of bushing shell for transformer dielectric loss provided by the invention and capacitance monitoring system further include：
The first end of anti-open-circuit protecting device, the anti-open-circuit protecting device is connect with described sleeve pipe end shield adapter, institute
The second end for stating anti-open-circuit protecting device is connect with described sleeve pipe detection unit.
Preferably, described sleeve pipe detection unit includes：
Current sensor, the earth current signal for acquiring the Transformer Bushing Tap；
First fourier transformation module obtains described for carrying out Fourier transformation processing to the earth current signal
The amplitude and phase of earth current signal；
First sending module, for the amplitude of the earth current signal and phase to be sent to on-line monitoring by bus
Host.
Preferably, the current sensor is automatic compensation type current sensor.
Preferably, the reference voltage detection unit includes：
Voltage transformer, the voltage signal for acquiring the busbar；
Transformation resistance, the current signal for the voltage signal of the busbar to be converted to the busbar；
Second fourier transformation module carries out Fourier transformation processing for the current signal to the busbar, obtains institute
State the amplitude and phase of the current signal of busbar；
Second sending module, for the amplitude of the current signal of the busbar and phase to be sent to online prison by bus
Survey host.
Preferably, the bus is RS485 buses or CAN bus.
As can be seen from the above technical solutions, the present invention has the following advantages：
The present invention provides a kind of bushing shell for transformer dielectric loss and capacitance to monitor system, including：Bushing shell for transformer, the change
Outlet of depressor casing is connect with busbar；Casing Detection unit is grounded with the end shield of the bushing shell for transformer and connects, uses
In the earth current signal with Transformer Bushing Tap described in reference voltage detection unit synchronous acquisition, and to the earth current
Signal carries out Fourier transformation processing, obtains the amplitude and phase of the earth current signal, by bus that the ground connection is electric
The amplitude and phase for flowing signal are sent to on-line monitoring host；The reference voltage detection unit, connect with the busbar, is used for
With the voltage signal of busbar described in described sleeve pipe detection unit synchronous acquisition, and the voltage signal of the busbar is converted to described
The current signal of busbar, then Fourier transformation processing is carried out to the current signal of the busbar, obtain the electric current letter of the busbar
Number amplitude and phase, the amplitude of the current signal of the busbar and phase are sent to by on-line monitoring host by bus；Institute
State on-line monitoring host, the current signal amplitude of amplitude and phase and the busbar for receiving the earth current signal and
Phase, according to the amplitude and phase of the amplitude of the earth current signal and the current signal of phase and the busbar to transformer
Casing dielectric loss and capacitance are detected；The on-line checking host specifically includes：Receiving module, for receiving the ground connection electricity
Flow the amplitude of signal and the amplitude and phase of the current signal of phase and the busbar；Dielectric loss value computing module, for according to institute
The phase for stating the phase of earth current signal and the current signal of the busbar, calculates the dielectric loss value of the bushing shell for transformer；
Capacitance computing module is used for the amplitude of the current signal of the amplitude and busbar according to the earth current signal, calculates
Go out the capacitance of the bushing shell for transformer.
In the present invention, using fourier transform method, directly will respectively by Casing Detection unit and reference voltage detection unit
The current signal of earth current signal and busbar carries out Fourier transformation, obtains the amplitude and phase of earth current signal, busbar
Current signal amplitude and phase after, be then forwarded to on-line monitoring host and calculated, need not be used at complicated simulation
Circuit is managed, the stability of long-term work is guaranteed, and can effectively inhibit the influence of harmonic wave interference, solves existing acquisition
And the existing, circuit higher to the stability requirement of hardware circuit of technology for seeking the phase difference of two fundamental frequency current signals
The drift of itself and the influence of harmonic wave interference are the technical issues of being difficult to overcome.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of structure of one embodiment that bushing shell for transformer dielectric loss and capacitance provided by the invention monitor system
Schematic diagram；
Fig. 2 is the circuit diagram of one embodiment that phase bit comparison provided by the invention measures；
Wherein, reference numeral is：
101, bushing shell for transformer；102, busbar；103, Casing Detection unit；104, reference voltage detection unit；105, exist
Line monitors host；106, bottom shielding of bushing adapter；107, anti-open-circuit protecting device；1031, current sensor；1032, first Fu
In leaf transformation module；1033, the first sending module；1041, voltage transformer；1042, transformation resistance；1043, the second Fourier
Conversion module；1044, the second sending module；1050, receiving module；1051, dielectric loss value computing module；1052, capacitance calculates
Module；1053, dielectric loss value comparison module；1054, the first alarm module；1055, capacitance comparison module；1056, the second alarm
Module；1057, data memory module；1058, data inputting module；1059, threshold setting module.
Specific implementation mode
An embodiment of the present invention provides a kind of bushing shell for transformer dielectric loss and capacitance to monitor system, solves existing acquisition
And the existing, circuit higher to the stability requirement of hardware circuit of technology for seeking the phase difference of two fundamental frequency current signals
The drift of itself and the influence of harmonic wave interference are the technical issues of being difficult to overcome.
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Referring to Fig. 1, the structure of a kind of bushing shell for transformer dielectric loss provided in an embodiment of the present invention and capacitance monitoring system
Schematic diagram.
A kind of structural schematic diagram of bushing shell for transformer dielectric loss and capacitance monitoring system provided in an embodiment of the present invention, packet
It includes：
Outlet of bushing shell for transformer 101, bushing shell for transformer 101 is connect with busbar 102；
Casing Detection unit 103 is grounded with the end shield of bushing shell for transformer 101 and connects, single for being detected with reference voltage
The earth current signal of 101 end shield of first 104 synchronous acquisition bushing shell for transformer, and earth current signal is carried out at Fourier transformation
Reason, obtains the amplitude and phase of earth current signal, is sent to the amplitude of earth current signal and phase online by bus
Monitor host 105；
Reference voltage detection unit 104 is connect with busbar 102, is used for and 103 synchronous acquisition busbar of Casing Detection unit
102 voltage signal, and the voltage signal of busbar 102 is converted to the current signal of busbar 102, then the electric current to busbar 102
Signal carries out Fourier transformation processing, obtains the amplitude and phase of the current signal of busbar 102, by bus by busbar 102
The amplitude and phase of current signal are sent to on-line monitoring host 105；
Monitor host 105, the current signal width of amplitude and phase and busbar 102 for receiving earth current signal on-line
Value and phase, according to the amplitude and phase of the amplitude of earth current signal and phase and the current signal of busbar 102 to transformer
101 dielectric loss of casing and capacitance are detected；
On-line checking host specifically includes：
Receiving module 1051, the width of the current signal of amplitude and phase and busbar 102 for receiving earth current signal
Value and phase；
Dielectric loss value computing module 1052 is used for the phase of the current signal of the phase and busbar 102 according to earth current signal
Position, calculates the dielectric loss value of bushing shell for transformer 101；
Capacitance computing module 1053 is used for the width of the current signal of the amplitude and busbar 102 according to earth current signal
Value, calculates the capacitance of bushing shell for transformer 101.
It should be noted that Casing Detection unit 103 and reference voltage detection unit 104 start simultaneously, acquisition respectively becomes
The current signal of the earth current signal and busbar 102 of 101 end shield of depressor casing, and to earth current signal and busbar 102
Current signal carries out discrete Fourier transform, and the current signal for obtaining earth current signal and busbar 102 compares 220V work
The fundamental phase of power supply.The phase that dielectric loss value computing module 1052 and capacitance computing module 1053 pass through reading earth current signal
The measurement result of the phase of the current signal of position and busbar 102, calculates the earth current signal phase of 101 end shield of bushing shell for transformer
For the phase difference of the current signal of busbar 102, to obtain the dielectric loss value and capacitance of bushing shell for transformer 101.
In the present invention, using fourier transform method, distinguished by Casing Detection unit 103 and reference voltage detection unit 104
Directly by the current signal of earth current signal and busbar 102 carry out Fourier transformation, obtain earth current signal amplitude and
Phase after the amplitude and phase of the current signal of busbar 102, is then forwarded to on-line monitoring host 105 and is calculated, need not be made
With complicated analog processing circuit, the stability of long-term work is guaranteed, and can effectively inhibit the influence of harmonic wave interference, solution
It has determined existing for the technology of the existing phase difference for obtaining and seeking two fundamental frequency current signals to the stabilization of hardware circuit
The drift of property more demanding, circuit itself and the influence of harmonic wave interference are the technical issues of being difficult to overcome.
Further, referring to Fig. 2, on-line monitoring host 105 further includes：
Dielectric loss value comparison module 1053 is connect with dielectric loss value computing module 1052, is used for the dielectric loss of bushing shell for transformer 101
Value is compared with preset initial dielectric loss value, obtains dielectric loss value variable quantity；
First alarm module 1054, connect with dielectric loss value comparison module 1053, for when dielectric loss value variable quantity is higher than preset
First threshold sends out the first warning message.
It should be noted that dielectric loss value comparison module 1053 gets the transformer obtained by dielectric loss value computing module 1052
The dielectric loss value of casing 101 is compared with preset preset initial dielectric loss value in dielectric loss value comparison module 1053, is situated between
Damage value variable quantity is simultaneously sent to the first alarm module 1054, and the first alarm module 1054 is higher than when the dielectric loss value variable quantity received
When preset first threshold, the first caution signal is sent out.
Further, on-line monitoring host 105 further includes：
Capacitance comparison module 1055 is connect with capacitance computing module 1053, is used for the capacitance of bushing shell for transformer 101
Amount is compared with preset initial capacitance, obtains electric capacitance change amount；
Second alarm module 1056, connect with capacitance comparison module 1055, for when electric capacitance change amount is higher than preset
When second threshold, the second warning message is sent out.
It should be noted that capacitance comparison module 1055 gets the transformer obtained by capacitance computing module 1053
The capacitance of casing 101 is compared with the preset preset initial capacitance of capacitance comparison module 1055, obtains capacitance
Amount variable quantity is simultaneously sent to the second alarm module 1056, and the second alarm module 1056 is when the electric capacitance change amount received is higher than pre-
When setting second threshold, the second warning message is sent out, wherein the first warning message is different warning letters from the second warning message
Breath so that staff can be told according to the first warning message or the second warning message be bushing shell for transformer 101 dielectric loss
There is failure in value or capacitance.
Further, on-line monitoring host 105 further includes：
Data memory module 1057, the historical data for storing bushing shell for transformer 101；
Data inputting module 1058, other data of the bushing shell for transformer 101 for receiving host computer transmission；
Threshold setting module 1059 is connect with data memory module 1057, data inputting module 1058 respectively, is used for basis
The historical data of bushing shell for transformer 101 and other data, determine preset first threshold and preset second threshold, and by preset first
Threshold value is sent to the first alarm module 1054, and preset second threshold is sent to the second alarm module 1056.
It should be noted that for running bushing shell for transformer 101, with dielectric loss value and the preset initial Jie of phase equipment
Damage value compares (tan δX- tan δN), variation range is no more than ± 0.3%, and capacitance (C compared with preset initial capacitanceX/
CN), variation range is no more than ± 5%, can realize the fault diagnosis to bushing shell for transformer 101 accordingly, also according to this artificial setting
Threshold setting module 1059.In addition to this, other than historical data has an impact the fault diagnosis of bushing shell for transformer 101,
The produce information and preventive trial data etc. of bushing shell for transformer 101 also have certain meaning, the transformation that can will be detected
The related comparison for participating in carrying out vertical and horizontal of device casing 101, to realize that the failure of comprehensive bushing shell for transformer 101 is examined
It is disconnected.Therefore, other data can be sent to on-line monitoring host 105 using host computer by data inputting module 1058.
Further, a kind of 101 dielectric loss of bushing shell for transformer and capacitance monitoring system provided by the invention further includes：
Bottom shielding of bushing adapter 106, bottom shielding of bushing adapter 106 is set to the end shield of bushing shell for transformer 101, for drawing
The earth current signal of 101 end shield of bushing shell for transformer；
Casing Detection unit 103 is connect with bottom shielding of bushing adapter 106.
It should be noted that bottom shielding of bushing adapter 106 has good contact reliability, leakproofness and compatibility, energy
Enough draw the earth current signal of 101 end shield of bushing shell for transformer.
Further, a kind of 101 dielectric loss of bushing shell for transformer and capacitance monitoring system provided by the invention further includes：
The first end of anti-open-circuit protecting device 108, anti-open-circuit protecting device 108 is connect with bottom shielding of bushing adapter 106, is prevented
The second end of open-circuit protecting device 108 is connect with Casing Detection unit 103.
Further, Casing Detection unit 103 includes：
Current sensor 1031, the earth current signal for acquiring 101 end shield of bushing shell for transformer；
First fourier transformation module 1032 is grounded for carrying out Fourier transformation processing to earth current signal
The amplitude and phase of current signal；
First sending module 1033, for the amplitude of earth current signal and phase to be sent to on-line monitoring by bus
Host 105.
It should be noted that current sensor 1031 obtains earth current from the ground wire of 101 end shield of bushing shell for transformer
Signal, then Fourier transformation processing is directly carried out to earth current signal by the first fourier transformation module 1032, it is connect
The amplitude and phase of earth-current signal, last first sending module 1033 is by bus by the amplitude and phase of earth current signal
It is sent to on-line monitoring host 105 and carries out subsequent processing.
Further, current sensor 1031 is automatic compensation type current sensor.
It should be noted that automatic compensation type current sensor is in addition to selecting the slope that initial permeability is higher, loss is smaller
Alloy is not made outside iron core, additionally uses unique profound and negative feedbck compensation technique, can be carried out to the excitatory magnetic potential of iron core entirely certainly
Dynamic compensation, keeps iron core to be operated in close to ideal Zero flux state.The current sensor of this punching structure is detecting 100 μ A
When the power frequency current signal of~1000mA, phse conversion error is dry by environment temperature and electromagnetism no more than ± 0.01 °, and not
The influence disturbed solves the accurate problem of sampling of the earth current signal to 101 end shield of bushing shell for transformer.
Further, reference voltage detection unit 104 includes：
Voltage transformer 1041, the voltage signal for acquiring busbar 102；
Transformation resistance 1042, the current signal for the voltage signal of busbar 102 to be converted to busbar 102；
Second fourier transformation module 1043 carries out Fourier transformation processing for the current signal to busbar 102, obtains
The amplitude and phase of the current signal of busbar 102；
Second sending module 1044, for being sent to the amplitude of the current signal of busbar 102 and phase by bus
Line monitors host 105.
It should be noted that voltage transformer 1041 obtains voltage signal from busbar 102, then pass through transformation resistance 1042
The voltage signal of busbar 102 is converted to the current signal of busbar 102, directly by the second fourier transformation module 1043 to mother
The current signal of line 102 carries out Fourier transformation processing, obtains the amplitude and phase of the current signal of busbar 102, the second last
The amplitude of the current signal of busbar 102 and phase are sent to on-line monitoring host 105 by bus and carried out by sending module 1044
Subsequent processing.
Further, bus is RS485 buses or CAN bus.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.
In several embodiments provided herein, it should be understood that disclosed system, device and module, it can be with
It realizes by another way.For example, the apparatus embodiments described above are merely exemplary, for example, the division of unit,
Only a kind of division of logic function, formula that in actual implementation, there may be another division manner, such as multiple units or component can be with
In conjunction with or be desirably integrated into another system, or some features can be ignored or not executed.Another point, it is shown or discussed
Mutual coupling, direct-coupling or communication connection can be by some interfaces, the INDIRECT COUPLING of device or unit or
Communication connection can be electrical, machinery or other forms.
The unit illustrated as separating component may or may not be physically separated, and be shown as unit
Component may or may not be physical unit, you can be located at a place, or may be distributed over multiple networks
On unit.Some or all of unit therein can be selected according to the actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, it can also
It is that each unit physically exists alone, it can also be during two or more units be integrated in one unit.Above-mentioned integrated list
The form that hardware had both may be used in member is realized, can also be realized in the form of SFU software functional unit.
It, can if integrated unit is realized in the form of SFU software functional unit and when sold or used as an independent product
To be stored in a computer read/write memory medium.Based on this understanding, technical scheme of the present invention substantially or
Say that all or part of the part that contributes to existing technology or the technical solution can embody in the form of software products
Out, which is stored in a storage medium, including some instructions are used so that a computer equipment
(can be personal computer, server or the network equipment etc.) executes all or part of each embodiment method of the present invention
Step.And storage medium above-mentioned includes：It is USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random
Access various Jie that can store program code such as memory (RAM, Random Access Memory), magnetic disc or CD
Matter.
More than, the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to aforementioned reality
Applying example, invention is explained in detail, it will be understood by those of ordinary skill in the art that：It still can be to aforementioned each
Technical solution recorded in embodiment is modified or equivalent replacement of some of the technical features；And these are changed
Or it replaces, the spirit and scope for various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution.
Claims (10)
1. a kind of bushing shell for transformer dielectric loss and capacitance monitor system, which is characterized in that including：
Outlet of bushing shell for transformer, the bushing shell for transformer is connect with busbar；
Casing Detection unit is grounded with the end shield of the bushing shell for transformer and connects, for synchronous with reference voltage detection unit
The earth current signal of the Transformer Bushing Tap is acquired, and Fourier transformation processing is carried out to the earth current signal,
The amplitude and phase of the earth current signal are obtained, is sent to the amplitude of the earth current signal and phase by bus
Monitor host on-line；
The reference voltage detection unit, connect with the busbar, is used for and mother described in described sleeve pipe detection unit synchronous acquisition
The voltage signal of line, and the voltage signal of the busbar is converted to the current signal of the busbar, then the electricity to the busbar
It flows signal and carries out Fourier transformation processing, obtain the amplitude and phase of the current signal of the busbar, by bus by the mother
The amplitude and phase of the current signal of line are sent to on-line monitoring host；
The on-line monitoring host, the current signal of amplitude and phase and the busbar for receiving the earth current signal
Amplitude and phase, according to the amplitude of the earth current signal and the amplitude and phase pair of the current signal of phase and the busbar
Bushing shell for transformer dielectric loss and capacitance are detected；
The on-line checking host specifically includes：
Receiving module, the amplitude of amplitude and the current signal of phase and the busbar for receiving the earth current signal and
Phase；
Dielectric loss value computing module is used for the phase of the current signal of the phase and busbar according to the earth current signal,
Calculate the dielectric loss value of the bushing shell for transformer；
Capacitance computing module is used for the amplitude of the current signal of the amplitude and busbar according to the earth current signal,
Calculate the capacitance of the bushing shell for transformer.
2. bushing shell for transformer dielectric loss according to claim 1 and capacitance monitor system, which is characterized in that the online prison
Surveying host further includes：
Dielectric loss value comparison module is connect with the dielectric loss value computing module, for by the dielectric loss value of the bushing shell for transformer and in advance
It sets initial dielectric loss value to be compared, obtains dielectric loss value variable quantity；
First alarm module is connect with the dielectric loss value comparison module, for being higher than preset first when the dielectric loss value variable quantity
Threshold value sends out the first warning message.
3. bushing shell for transformer dielectric loss according to claim 2 and capacitance monitor system, which is characterized in that the online prison
Surveying host further includes：
Capacitance comparison module is connect with the capacitance computing module, for by the capacitance of the bushing shell for transformer and in advance
It sets initial capacitance to be compared, obtains electric capacitance change amount；
Second alarm module is connect with the capacitance comparison module, for being higher than preset second when the electric capacitance change amount
When threshold value, the second warning message is sent out.
4. bushing shell for transformer dielectric loss according to claim 3 and capacitance monitor system, which is characterized in that the online prison
Surveying host further includes：
Data memory module, the historical data for storing the bushing shell for transformer；
Data inputting module, other data of the bushing shell for transformer for receiving host computer transmission；
Threshold setting module is connect with the data memory module, the data inputting module respectively, for according to the transformation
The historical data of device casing and other data, determine the preset first threshold and the preset second threshold, and will be described pre-
It sets first threshold and is sent to first alarm module, the preset second threshold is sent to second alarm module.
5. bushing shell for transformer dielectric loss according to claim 1 and capacitance monitor system, which is characterized in that further include：
Bottom shielding of bushing adapter, described sleeve pipe end shield adapter are set to the end shield of the bushing shell for transformer, described for drawing
The earth current signal of Transformer Bushing Tap；
Described sleeve pipe detection unit is connect with described sleeve pipe end shield adapter.
6. bushing shell for transformer dielectric loss according to claim 5 and capacitance monitor system, which is characterized in that further include：
The first end of anti-open-circuit protecting device, the anti-open-circuit protecting device is connect with described sleeve pipe end shield adapter, described anti-
The second end of open-circuit protecting device is connect with described sleeve pipe detection unit.
7. bushing shell for transformer dielectric loss according to claim 1 and capacitance monitor system, which is characterized in that described sleeve pipe is examined
Surveying unit includes：
Current sensor, the earth current signal for acquiring the Transformer Bushing Tap；
First fourier transformation module obtains the ground connection for carrying out Fourier transformation processing to the earth current signal
The amplitude and phase of current signal；
First sending module, for the amplitude of the earth current signal and phase to be sent to on-line monitoring master by bus
Machine.
8. bushing shell for transformer dielectric loss according to claim 7 and capacitance amount detection systems, which is characterized in that the electric current passes
Sensor is automatic compensation type current sensor.
9. bushing shell for transformer dielectric loss according to claim 1 and capacitance amount detection systems, which is characterized in that the benchmark electricity
Pressure detection unit include：
Voltage transformer, the voltage signal for acquiring the busbar；
Transformation resistance, the current signal for the voltage signal of the busbar to be converted to the busbar；
Second fourier transformation module carries out Fourier transformation processing for the current signal to the busbar, obtains the mother
The amplitude and phase of the current signal of line；
Second sending module, for the amplitude of the current signal of the busbar and phase to be sent to on-line monitoring master by bus
Machine.
10. bushing shell for transformer dielectric loss as claimed in any of claims 1 to 9 and capacitance amount detection systems, feature
It is, the bus is RS485 buses or CAN bus.
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| CN113625058A (en) * | 2021-08-13 | 2021-11-09 | 云南电网有限责任公司电力科学研究院 | Early warning method and system for monitoring transformer bushing based on abnormal point group |
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