CN107247204A - The condition monitoring system and monitoring method of voltage limiter in super, extra-high voltage series compensation device - Google Patents
The condition monitoring system and monitoring method of voltage limiter in super, extra-high voltage series compensation device Download PDFInfo
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- CN107247204A CN107247204A CN201710561024.8A CN201710561024A CN107247204A CN 107247204 A CN107247204 A CN 107247204A CN 201710561024 A CN201710561024 A CN 201710561024A CN 107247204 A CN107247204 A CN 107247204A
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
Abstract
The invention discloses a kind of condition monitoring system of voltage limiter in super, extra-high voltage series compensation device and monitoring method, it is arranged on by two post voltage limiters in every group of voltage limiter unit with parallel way between high voltage bus and low-voltage busbar；First divider gathers the voltage signal of voltage limiter unit, micro-current transformer gathers the leakage current signal of voltage limiter unit, then the data processing unit voltage signal collected and leakage current signal being transferred in ground monitoring platform is handled, such micro-current transformer can measure the leakage current during parallel connection of two post voltage limiters simultaneously, because two post voltage limiters are in parallel in one group of voltage limiter unit, the leakage current that micro-current mutual inductor measuring is obtained is double, it is more sensitive when monitoring the leakage current of voltage limiter unit, both the number of micro-current transformer quantity had been reduced, it in turn ensure that Sensor monitoring precision, calculating analysis is carried out additionally by the voltage signal of collection voltage limiter unit, improve the accuracy rate of monitoring system.
Description
Technical field
The present invention relates to operation states of electric power system on-line monitoring technique field, more particularly to a kind of super, extra-high voltage series compensation
The condition monitoring system and monitoring method of voltage limiter in device.
Background technology
In super, extra-high voltage series compensation device, voltage limiter is the basic protection equipment of capacitor bank, in order to ensure that it absorbs work(
Rate, voltage limiter is frequently with multicolumn parallel form；But because voltage limiter longtime running can occur in the presence of Uc
Partial deterioration, destroys being uniformly distributed for each intercolumniation electric current, and failure is resulted even in when serious and triggers accident, the safety of power network is influenceed
Stable operation；A kind of on-line monitoring system or monitoring method are needed for this, can with the running status of each post voltage limiter of at-once monitor,
After voltage limiter operation exception is found, alarm can be accurately positioned, facilitates engineering staff to arrange the maintenance that has a power failure, string is reduced and mends
The unplanned outage time of device, improve the operational reliability of series compensation device.
At present, conventional online voltage limiter monitoring method is applied to low-voltage-grade mostly, lacks for super, extra-high voltage etc.
The efficient diagnosis method of level；Chinese patent application CN201120572134.2 " arrester on-Line Monitor Device " discloses a kind of string
The arrester on-Line Monitor Device on capacitor is mended, the invention is using the collection coil being enclosed on arrester to the post arrester
Leakage current is measured, and by collector by signal output；Chinese patent application CN201210461731.7 " is used to go here and there and mended
The on-Line Monitor Device and its method of voltage limiter in capacitor " discloses a kind of online prison for voltage limiter in series capacitor compensation
Devices and methods therefor is surveyed, the invention uses leakage of the current transformer being arranged near voltage limiter high-pressure side to the post voltage limiter
Electric current is measured, and by the sensing head part on insulation column top by signal output；But in super, extra-high voltage series complement system
In, voltage limiter is often more than 20 posts, and single-column voltage limiter failure leakage current only has hundred μ A magnitudes, using above monitoring device or side
Method is difficult diagnosis single-column voltage limiter failure；If all installing monitor per post, data collecting system and series compensation platform can be supervised
Measurement equipment power-supply system brings larger burden, influences system reliability；And series compensation platform is in high electric field strong magnetic field circumstance, ring
Border temperature change is larger, influences the measurement accuracy of monitoring device, it is therefore desirable to a kind of new monitoring system and monitoring method to it is super,
Voltage limiter in extra-high voltage series compensation device carries out on-line monitoring and analyzing and diagnosing immediately.
The content of the invention
It is an object of the invention to provide a kind of condition monitoring system of voltage limiter in super, extra-high voltage series compensation device and monitoring side
Method, can be monitored to the single-column voltage limiter in super, extra-high voltage series compensation device, and can reduce the quantity of monitor, improve
Monitoring accuracy and accuracy rate.
The technical scheme is that：The condition monitoring system of voltage limiter in a kind of super, extra-high voltage series compensation device, including with
In collection is super, in extra-high voltage grid the data acquisition unit of the leakage current of multigroup voltage limiter unit and voltage, for collection
Signal carries out analyzing and diagnosing and the ground monitoring platform of fault alarm and the signal for data acquisition unit to be collected is passed
The defeated signal transmission through fiber unit to ground monitoring platform；Multigroup voltage limiter unit includes two post voltage limiters, two post voltage limiters
It is connected in parallel between high voltage bus and low-voltage busbar；The data acquisition unit includes being used to gather the of the voltage of voltage limiter unit
One divider, voltage limiter measurement case and multiple micro-current transformers for being used to gather the leakage current of voltage limiter unit；The limit
Depressor measurement case includes electromagnetic shielding shell and the data collecting plate card being arranged in electromagnetic shielding shell；The ground monitoring is put down
Platform includes data processing unit；The current signal of the signal acquisition terminal of multiple micro-current transformers respectively with multigroup voltage limiter unit
Output end is connected, and the signal output part of multiple micro-current transformers is connected with the signal input part of data collecting plate card；
Voltage signal output end of the signal acquisition terminal of first divider respectively with multigroup voltage limiter unit is connected, the first divider
Signal output part is connected with the signal input part of data collecting plate card.
Further two post voltage limiters in every group of voltage limiter unit are connected in parallel by aluminium row, the two ends difference of aluminium row
On the bottom plate for being connected to two post voltage limiters.
Further one section of connecting line is drawn on the bottom plate of any post voltage limiter in every group of voltage limiter unit to be connected to
In low-voltage busbar, the signal acquisition terminal of micro-current transformer is connected with the connecting line, two post pressure limitings in every group of voltage limiter unit
The high-voltage terminal of device is both connected on high voltage bus.
Further the signal transmission through fiber unit includes optical fiber cylinder and is separately positioned on two light at optical fiber cylinder two ends
Electric modular converter, signal transmission interface of two photoelectric conversion modules respectively with data collecting plate card and data processing unit is connected
Connect.
Further also include the second divider, the high-voltage terminal and low voltage terminal of the second divider are connected to
On high voltage bus and low-voltage busbar, the voltage input end sum of the voltage output end of the second divider respectively with micro-current transformer
It is connected according to the voltage input end of analog input card, for data acquisition unit micro-current transformer and data collecting plate card offer
Dc source.
Further the voltage input end of the data collecting plate card is provided with for preventing surge current destroys data from adopting
Collect the current limiting pressure-limiting protection module of board.
The further monitoring side also including the use of the condition monitoring system of voltage limiter in above-mentioned super, extra-high voltage series compensation device
Method, it is characterised in that comprise the following steps：
Step A：Micro-current transformer and the first divider gather the leakage current and voltage of voltage limiter unit respectively, and will
The signal collected is transferred to data collecting plate card；
Step B：The leakage current signal collected and voltage signal are passed through signal transmission through fiber list by data collecting plate card
Member is transferred to data processing unit；
Step C：Data processing unit is analyzed and processed to leakage current signal and voltage signal, specifically includes step
C1-C3：
Step C1：Data processing unit is by the leakage current signal of the voltage limiter unit collected and voltage signal application base
Calculated in the Fast Fourier Transform (FFT) of Blackman-Harris window and double peak interpolation algorithm；
The Cosine Window general expression of Blackman-Harris window is：
akFor the item number of Cosine Window, N is sampling number, K=3, a0=0.35875, a1=0.48829, a2=14128, a3
=0.01168；
Fundamental wave and third-harmonic component parameter are calculated, the leakage current signal of voltage limiter unit is subjected to bimodal difference fortune
Calculate, calculating can obtain fundamental current amplitude I after finishing1, fundamental current phase thetai1, triple harmonic current amplitude I3, three times humorous
Ripple current phase θi3；Total current amplitude I can be by each harmonic squared magnitude and calculating.
The bimodal difference operation of voltage signal progress is obtained to the first divider measurement and obtains fundamental phase θu1, fundamental wave can be obtained
Current in resistance property Ir1：
Ir1=I1cos(θu1-θi1)
Current in resistance property third-harmonic component and resistive current first harmonics component are anti-phase, current in resistance property third-harmonic component amplitude Ir3
Calculation formula is：
Ir3=I3cos(θu1+180°-θi3)
Step C2：With harmonic analysis method, that is, pass through fundamental harmonic resistant leakage current Ir1And current in resistance property third-harmonic component amplitude
Ir3Change differentiate come the operation conditions to multigroup voltage limiter unit：When voltage limiter valve block aging, current in resistance property three times
Harmonic component amplitude Ir3It can dramatically increase；When voltage limiter internal wetted, fundamental harmonic resistant leakage current Ir1Dramatically increase；
Step C3：Differential pair ratio is carried out respectively to the leakage current signal of multigroup voltage limiter unit and failure voltage limiter is positioned
Unit；Due to multigroup voltage limiter unit while the probability that goes wrong is relatively low, if certain voltage limiter unit breaks down, its leakage current
When parameter exceedes given threshold or there is larger difference with the measurement data of other groups of voltage limiter units, monitoring system is to orientate as
Failure voltage limiter unit, startup separator alarm, reminds staff's on-call maintenance.
The present invention includes two post voltage limiters by every group of voltage limiter unit, and two post voltage limiters are arranged on high pressure with parallel way
Between bus and low-voltage busbar；The voltage signal of voltage limiter unit is gathered by the first divider, is adopted by micro-current transformer
Collect the leakage current signal of voltage limiter unit, the voltage signal collected and leakage current signal are then transferred to ground monitoring
Data processing unit in platform is handled, such micro-current transformer can measure simultaneously two post voltage limiters it is in parallel when
Leakage current, because two post voltage limiters are in parallel in one group of voltage limiter unit, the resistance after two post voltage limiters are in parallel is single-column pressure limiting
The half of device resistance, the leakage current that micro-current mutual inductor measuring is obtained is double, leakage of the micro-current transformer in monitoring voltage limiter unit
Let out more sensitive during electric current, both reduced the number of micro-current transformer quantity, in turn ensure that Sensor monitoring precision, in addition
Calculating analysis is carried out by the voltage signal for gathering voltage limiter unit, the accuracy rate of monitoring system is improved.
It is further advanced by aluminium row two post voltage limiters in every group of voltage limiter unit are connected in parallel, aluminium row dismounting side
Just, it is easy to change, when certain voltage limiter unit breaks down, aluminium row can be pulled down and two post voltage limiters is tested respectively, really
Recognizing after failure only need to change failure voltage limiter.
Further signal transmission through fiber unit includes optical fiber cylinder and is separately positioned on two photoelectricity turn at optical fiber cylinder two ends
Block is changed the mold, signal transmission interface of two photoelectric conversion modules respectively with data collecting plate card and data processing unit is connected,
The signal collected is changed and transmitted by signal transmission through fiber unit, strong anti-interference performance can effectively isolate
Electromagnetic interference from power supply and high voltage platform, efficiently solves influence of the electromagnetic interference to measurement accuracy.
Further the voltage input end of data collecting plate card is provided with current limiting pressure-limiting protection module, can prevent surge electricity
Stream is damaged to data collecting plate card, the stability of strengthening system.
The monitoring method realized further via design on ground monitoring platform, to the voltage limiter unit collected
Leakage current signal and voltage signal carries out Fast Fourier Transform (FFT) based on Blackman-Harris window and double peak interpolation is calculated
Method is calculated, and the parameter obtained to calculating is analyzed and early warning, improves the degree of accuracy monitored to voltage limiter unit, is increased
The strong super, stability of extra-high voltage system.
Brief description of the drawings
Fig. 1 is theory of constitution figure of the invention；
Fig. 2 is the connection diagram of voltage limiter unit of the present invention；
Fig. 3 is flow chart of the invention.
Embodiment
A kind of condition monitoring system of the voltage limiter suitable for super, extra-high voltage series compensation device, as depicted in figs. 1 and 2, this reality
The voltage limiter connection scheme that example uses a kind of optimization is applied, without being connected with the ground wire in super, extra-high voltage grid；Super, extra-high voltage
Comprising the multicolumn voltage limiter array being made up of 20 post voltage limiters in power network, multicolumn voltage limiter array is in series compensation platform, with line
Road voltage is in same grade；It is connected between the bottom plate 202 of adjacent two posts voltage limiter by aluminium row 201, constitutes one group of parallel connection
Voltage limiter unit 104；I.e. live 20 post voltage limiters constitute ten groups of voltage limiter units 104 in parallel altogether；Each group of voltage limiter
One section of aluminum stranded conductor 204 is drawn in unit 104 on the bottom plate 202 of any post voltage limiter to be connected in low-voltage busbar 205, voltage limiter
The high-voltage terminal of two post voltage limiters is both connected on high voltage bus 203 in unit 104.
Described monitoring system includes the leakage current for being used to gather multigroup voltage limiter unit 104 in super, extra-high voltage grid
Data acquisition unit 101 with voltage, for the leakage current to collecting and voltage signal carry out analyzing and diagnosing and failure report
Alert ground monitoring platform 111 and the signal for data acquisition unit 101 to be collected are transferred to ground monitoring platform 111
Signal transmission through fiber unit 102.
The data acquisition unit 101 includes being used to gather the first divider of the voltage signal of voltage limiter unit 104
106a, voltage limiter measurement case 109 and multiple micro-current transformers 105 for being used to gather the leakage current of voltage limiter unit 104；Institute
Voltage limiter measurement case 109 and the equipotential of low-voltage busbar 205 are stated, the side of voltage limiter unit 104 is placed in, voltage limiter measurement case 109 is wrapped
Electromagnetic shielding shell and the data collecting plate card 107 being arranged in electromagnetic shielding shell are included, the voltage of data collecting plate card 107 is defeated
Enter end and be provided with current limiting pressure-limiting protection module, prevent surge current from destroying collection plate；Micro-current transformer 105 is Zero flux electric current
Transformer, punching structure eliminates influence of the exciting current to mutual inductor measuring accuracy of measurement using compensative winding, makes cell winding
Always work under zero load condition, its precision meets 200 μ A~10mA leakage current measurements in voltage limiter unit 104；Micro- electricity
The built in op amplifying circuit of current transformer 105, ± 10mA electric current is converted into ± 5V can be collected the electricity of card acquisition process
Press signal；Multiple micro-current transformers 105 be separately mounted to the bottom plate 202 of multigroup voltage limiter unit 104 and low-voltage busbar 205 it
Between, multiple micro-current transformers 105 are each passed through between the bottom plate 202 of multigroup voltage limiter unit 104 and low-voltage busbar 205 and connected
Aluminum stranded conductor 204, to realize that current signal output end and the signal output part of voltage limiter unit 104 are connected；Multiple micro-currents
Signal input part of the signal output part of transformer 105 with data collecting plate card 107 is connected, for by the pressure limiting collected
The leakage current of device unit 104 is transferred to data collecting plate card 107, is so combined with the voltage limiter connection scheme of above-mentioned optimization
Afterwards, a micro-current transformer 105 can measure simultaneously two post voltage limiters it is in parallel when leakage current, due to one group of voltage limiter unit
Two post voltage limiters are in parallel in 104, and the resistance after two post voltage limiters are in parallel is the half of single-column voltage limiter resistance, micro-current transformer
105 leakage currents measured are double, and micro-current transformer 105 is more clever when monitoring the leakage current of voltage limiter unit 104
It is quick, the number of the quantity of micro-current transformer 105 had both been reduced, Sensor monitoring precision is in turn ensure that；Aluminium arranges 201 convenient disassemblies,
It is easily changed, when certain voltage limiter unit 104 breaks down, aluminium row 201 can be pulled down and two post voltage limiters are tested respectively,
Confirm that only failure voltage limiter need to be changed after failure.
The first divider 106a is arranged on above voltage limiter measurement case 109, the first divider 106a signal acquisition
End and signal output part are inputted with the voltage signal output end of voltage limiter unit 104 and the signal of data collecting plate card 107 respectively
End is connected, for gathering the voltage of voltage limiter unit 104 and transmitting the information of voltage collected to data collecting plate card
107, because multigroup voltage limiter unit 104 is connected in parallel between high voltage bus 203 and low-voltage busbar 205, multigroup voltage limiter unit 104
The voltage at two ends is identical, therefore only the first divider 106a high-voltage terminal and low voltage terminal need to be connected into high pressure
Voltage signal acquisition is realized on bus 203 and low-voltage busbar 205, by signal output part and the signal of data collecting plate card 107
Input is connected；The second divider 106b, the second divider 106b high pressure are additionally provided with voltage limiter measurement case 109
Terminals and low voltage terminal are also connected on high voltage bus 203 and low-voltage busbar 205, the second divider 106b voltage
Output end is connected with the voltage input end of micro-current transformer 105 and the voltage input end of data collecting plate card 107 respectively, uses
In to micro-current transformer 105 and the offer 12V dc sources of data collecting plate card 107.
The signal transmission through fiber unit 102 includes optical fiber cylinder 110 and is separately positioned on two light at the two ends of optical fiber cylinder 110
Electric modular converter 108, two photoelectric conversion modules 108 respectively with data collecting plate card 107 and the signal of data processing unit 103
Coffret is connected；Enter because power supply acquisition is relatively difficult on high pressure series compensation platform, it is necessary to which each group of data is transferred into ground
Row processing, fibre-optic transmission system (FOTS) transmission rate is high, and message capacity is big, and strong anti-interference performance can effectively isolate from power supply
And the electromagnetic interference of high voltage platform, influence of the electromagnetic interference to measurement accuracy is efficiently solved, the present embodiment is logical from optical fiber
Reliable existing series compensation platform and the signal on ground are transmitted；In super, extra-high voltage grid running, photoelectric conversion module 108 will be adopted
The electric parameter collected is converted to optical signal, and by optical fiber cylinder 110 by multiple signals synchronous transfer to ground monitoring platform 111,
Realize the real-time synchronization transmission of multiple signals.
The ground monitoring platform 111 includes data processing unit 103；Ground monitoring platform 111 is based on IEC61850
The status monitoring platform of protocol realization, the platform uses C/S frameworks, is responsible for the access and management of series compensation device, and entirely exist
The motion control of line monitoring system.
As shown in figure 3, the monitoring method realized on ground monitoring platform 111 comprises the following steps：
Step A：The divider 106a of micro-current transformer 105 and first gathers the leakage of multigroup voltage limiter unit 104 respectively
Electric current and voltage, and the signal collected is transferred to data collecting plate card 107；
Step B：The leakage current signal collected and voltage signal are passed through signal transmission through fiber by data collecting plate card 107
Unit 102 is transferred to data processing unit 103；
Step C：Data processing unit 103 is analyzed and processed to leakage current signal and voltage signal, specifically includes step
Rapid C1-C3：
Step C1：Data processing unit 103 is by the leakage current signal and voltage signal of the voltage limiter unit 104 collected
Calculated using the Fast Fourier Transform (FFT) based on Blackman-Harris window and double peak interpolation algorithm；
The Cosine Window general expression of Blackman-Harris window is：
akFor the item number of Cosine Window, N is sampling number；
Different K value and coefficient akDetermine different windows：It is exactly rectangular window during K=0；During K=1, a0=0.54, a1=
0.46, it is hamming code window, a0=a1=0.5 is Hanning window；K=3, takes a0=0.35875, a1=0.48829, a2=14128, a3=
It is Blackman-Harris window when 0.01168；
Fundamental wave and third-harmonic component parameter are calculated, the leakage current signal of voltage limiter unit 104 is subjected to centre frequency
For 50Hz and 150Hz difference operation bimodal twice, the component of other frequencies is omitted because accounting is less；Calculating finish after i.e.
It can obtain fundamental current amplitude I1, fundamental current phase thetai1, triple harmonic current amplitude I3, triple harmonic current phase thetai3；Entirely
Current amplitude I can be by each harmonic squared magnitude and calculating.
The bimodal difference operation of voltage signal progress is obtained to the first divider 106a measurements and obtains fundamental phase θu1, can obtain
Fundamental harmonic resistant leakage current Ir1：
Ir1=I1cos(θu1-θi1)
Current in resistance property third-harmonic component and resistive current first harmonics component are anti-phase, current in resistance property third-harmonic component amplitude Ir3
Calculation formula is：
Ir3=I3cos(θu1+180°-θi3)
Step C2：With harmonic analysis method, that is, pass through fundamental harmonic resistant leakage current Ir1And current in resistance property third-harmonic component amplitude
Ir3Change differentiate come the operation conditions to multigroup voltage limiter unit 104：When voltage limiter valve block aging, current in resistance property three
Order harmonic components amplitude Ir3It can dramatically increase；When voltage limiter internal wetted, fundamental harmonic resistant leakage current Ir1Dramatically increase；With humorous
It can be also used in combination while wave analysis method with the method such as condenser current compensation method.
Step C3：Differential pair ratio is carried out respectively to the leakage current signal of multigroup voltage limiter unit 104 and failure limit is positioned
Depressor unit 104；Differential pair ratio is carried out respectively for eliminating environment electromagnetics to the leakage current signal of multigroup voltage limiter unit 104
Interference and temperature drift influence, improve measurement accuracy, due to multigroup voltage limiter unit 104 while the probability that goes wrong is relatively low, if certain is limited
Depressor unit 104 breaks down, and its leakage current parameter exceedes given threshold or the measurement number with other groups of voltage limiter units 104
During according to there is larger difference, monitoring system is to orientate failure voltage limiter unit 104 as, startup separator alarm, reminds staff
On-call maintenance, such as fundamental harmonic resistant leakage current Ir1Exceed given threshold Deng leakage current parameter；If accused to further improve failure
Alert accuracy, after being positioned to failure voltage limiter unit 104, by the voltage limiter unit 104 of positioning and database
The historical record and ambient parameter of voltage limiter unit 104 carry out analysis contrast, carry out accident analysis and assessment of failure, then true again
It is fixed that whether startup separator is alerted.
Meanwhile, the ground monitoring platform 111 possesses front end and sets function, and online supervision and inspection unit can be set by front end
Collection period, alarm threshold value setting etc..
The above method carries out being based on Bu Laike to the leakage current signal of voltage limiter unit 104 and voltage signal that collect
The Fast Fourier Transform (FFT) of graceful-Harris's window and double peak interpolation algorithm are calculated, and the parameter obtained to calculating is analyzed
And early warning, the degree of accuracy monitored to voltage limiter is improved, the stability of super extra-high voltage grid system is enhanced.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
The present invention is described in detail with reference to foregoing embodiments, it will be understood by those within the art that：It is still
Technical scheme described in previous embodiment can be modified, or which part or all technical characteristic are carried out etc.
With replacement；And these modifications or replacement, the essence of appropriate technical solution is departed from technical scheme of the embodiment of the present invention
Scope.
Claims (7)
1. the condition monitoring system of voltage limiter in a kind of super, extra-high voltage series compensation device, it is characterised in that：Including for gather it is super,
The data acquisition unit of the leakage current of multigroup voltage limiter unit and voltage in extra-high voltage grid, for being divided collection signal
Analysis diagnosis and the ground monitoring platform of fault alarm and the signal for data acquisition unit to be collected are transferred to ground prison
Control the signal transmission through fiber unit of platform；Multigroup voltage limiter unit includes two post voltage limiters, and two post voltage limiters are connected in parallel on high pressure
Between bus and low-voltage busbar；First divider of voltage of the data acquisition unit including being used to gather voltage limiter unit,
Voltage limiter measures case and multiple micro-current transformers for being used to gather the leakage current of voltage limiter unit；The voltage limiter measures case
Including electromagnetic shielding shell and the data collecting plate card being arranged in electromagnetic shielding shell；The ground monitoring platform includes data
Processing unit；Current signal output end of the signal acquisition terminal of multiple micro-current transformers respectively with multigroup voltage limiter unit is connected
Connect, the signal output part of multiple micro-current transformers is connected with the signal input part of data collecting plate card；First divider
Voltage signal output end of the signal acquisition terminal respectively with multigroup voltage limiter unit be connected, the signal output part of the first divider
It is connected with the signal input part of data collecting plate card.
2. the condition monitoring system of voltage limiter in super, extra-high voltage series compensation device as claimed in claim 1, it is characterised in that：Often
Two post voltage limiters in group voltage limiter unit are connected in parallel by aluminium row, and the two ends of aluminium row are connected to two post voltage limiters
On bottom plate.
3. the condition monitoring system of voltage limiter in super, extra-high voltage series compensation device as claimed in claim 2, it is characterised in that：Often
One section of connecting line is drawn on the bottom plate of any post voltage limiter in group voltage limiter unit to be connected in low-voltage busbar, micro-current is mutual
The signal acquisition terminal of sensor is connected with the connecting line, and the high-voltage terminal of two post voltage limiters is all connected with every group of voltage limiter unit
On high voltage bus.
4. the condition monitoring system of voltage limiter in super, the extra-high voltage series compensation device as described in claim 1-3 is any, its feature exists
In：The signal transmission through fiber unit includes optical fiber cylinder and is separately positioned on two photoelectric conversion modules at optical fiber cylinder two ends, two
Signal transmission interface of the individual photoelectric conversion module respectively with data collecting plate card and data processing unit is connected.
5. the condition monitoring system of voltage limiter in super, extra-high voltage series compensation device as claimed in claim 4, it is characterised in that：Also
Including the second divider, the high-voltage terminal and low voltage terminal of the second divider are connected to high voltage bus and low-voltage busbar
On, the voltage output end of the second divider is defeated with the voltage input end of micro-current transformer and the voltage of data collecting plate card respectively
Enter end to be connected, for providing dc source to data acquisition unit micro-current transformer and data collecting plate card.
6. the condition monitoring system of voltage limiter in super, extra-high voltage series compensation device as claimed in claim 5, it is characterised in that：Institute
The voltage input end for stating data collecting plate card is provided with for preventing the current limiting pressure-limiting of surge current destruction data collecting plate card from protecting
Protect module.
7. usage right requires the monitoring method of the condition monitoring system of voltage limiter in super, extra-high voltage series compensation device described in 1-6,
It is characterised in that it includes following steps：
Step A：Micro-current transformer and the first divider gather the leakage current and voltage of voltage limiter unit respectively, and will collection
To signal be transferred to data collecting plate card；
Step B：Data collecting plate card passes the leakage current signal collected and voltage signal by signal transmission through fiber unit
It is defeated to arrive data processing unit；
Step C：Data processing unit is analyzed and processed to leakage current signal and voltage signal, specifically includes step C1-C3：
Step C1：The leakage current signal and voltage signal of the voltage limiter unit collected are applied and are based on cloth by data processing unit
Rec is graceful-and the Fast Fourier Transform (FFT) of Harris's window and double peak interpolation algorithm calculated；
The Cosine Window general expression of Blackman-Harris window is：
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akFor the item number of Cosine Window, N is sampling number, K=3, a0=0.35875, a1=0.48829, a2=14128, a3=
0.01168；
Fundamental wave and third-harmonic component parameter are calculated, the leakage current signal of voltage limiter unit is subjected to bimodal difference operation, meter
Calculation can obtain fundamental current amplitude I after finishing1, fundamental current phase thetai1, triple harmonic current amplitude I3, triple harmonic current
Phase thetai3；Total current amplitude I can be by each harmonic squared magnitude and calculating.
The bimodal difference operation of voltage signal progress is obtained to the first divider measurement and obtains fundamental phase θu1, fundamental wave can be obtained resistive
Electric current Ir1：
Ir1=I1cos(θu1-θi1)
Current in resistance property third-harmonic component and resistive current first harmonics component are anti-phase, current in resistance property third-harmonic component amplitude Ir3Calculate
Formula is：
Ir3=I3cos(θu1+180°-θi3)
Step C2：With harmonic analysis method, that is, pass through fundamental harmonic resistant leakage current Ir1And current in resistance property third-harmonic component amplitude Ir3's
Change differentiates come the operation conditions to multigroup voltage limiter unit：When voltage limiter valve block aging, current in resistance property triple-frequency harmonics
Component amplitude Ir3It can dramatically increase；When voltage limiter internal wetted, fundamental harmonic resistant leakage current Ir1Dramatically increase；
Step C3：Differential pair ratio is carried out respectively to the leakage current signal of multigroup voltage limiter unit and failure voltage limiter list is positioned
Member；Because multigroup voltage limiter unit goes wrong simultaneously, probability is relatively low, if certain voltage limiter unit breaks down, its leakage current is joined
When there is larger difference more than given threshold or with the measurement data of other groups of voltage limiter units in amount, monitoring system be orientate as therefore
Hinder voltage limiter unit, staff's on-call maintenance is reminded in startup separator alarm.
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