CN103884967A - Method for positioning ultra high voltage convertor transformer winding internal partial discharge and device thereof - Google Patents
Method for positioning ultra high voltage convertor transformer winding internal partial discharge and device thereof Download PDFInfo
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- CN103884967A CN103884967A CN201410049395.4A CN201410049395A CN103884967A CN 103884967 A CN103884967 A CN 103884967A CN 201410049395 A CN201410049395 A CN 201410049395A CN 103884967 A CN103884967 A CN 103884967A
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Abstract
The invention discloses a method for positioning ultra high voltage convertor transformer winding internal partial discharge and a device thereof. According to a data flow connection sequence, the device orderly comprises a DFB laser, an optical fiber polarizer integrated module, a single-phase three-column parallel connection structure transmission circuit, an optical fiber analyzer integrated module, a PIN photoelectric detector and processing module, a 16-channel partial discharge synchronous detection system, and an UHV converter transformer winding internal partial discharge positioning system. 16 optical fiber current sensing units are arranged in the single-phase three-column parallel connection structure transmission circuit, a partial discharge signal proportional relationship is obtained, the correlation characteristics with the partial discharge signals of an external valve side casing pipe, a network side casing pipe and iron core grounding are analyzed, and the identification of an interference signal and the positioning of multiple-column parallel connection network side and valve side discharge sources in a convertor transformer field partial discharge test are realized. The insulation condition of equipment can be effectively judged, and a basis is provided for the comprehensive evaluation of ultra high voltage convertor transformer performance by an expert.
Description
Technical field
The invention belongs to power transmission and transforming equipment technical field, be particularly related to the inner partial discharge positioning method of the large capacity ultrahigh voltage converter power transformer of one ± 1100kV winding and device, be applicable to dispatch from the factory or respond to when on-the-spot UHV is long withstand voltage and execute the anti-interference and winding internal discharge source of DC break down voltage band partial discharge test outward and locate.
Background technology
Along with the carrying out smoothly and implement of 1000kV ultra-high voltage AC transmission engineering, more the development of voltage levels HVDC Transmission Technology and application become the main contents of electric power application focus and Electric Power Network Planning.Utilize ± 800 kV direct current achievements in research, use for reference 1000 kV AC extra high voltage Experience in Developments, can be increased to by DC voltage grade ± 1100 kV of DC transmission system increase transmission line capability on a large scale, and select ± 1100 kV extra-high voltage direct-currents can reduce construction DC engineering number, reduce line loss, the input of economizing on the use of funds.
Current, the extra-high voltage direct-current transmission project planning of accurate east～Sichuan was constructed and put into operation about 2015, and transmission voltage grade is ± 1100kV, transmission line capability 10000MW.DC engineering power transmission sequence starting point is Xinjiang current conversion station, by way of Xinjiang, Gansu, Shaanxi, 4 provinces and regions, Sichuan, and drop point Sichuan current conversion station, the about 2600km of line length.UHV is one of most important equipment in ultra-high voltage converter station, its function is by 500kV (or 750kV, 1000kV) net side alternating voltage becomes valve side alternating voltage by transformer, be ± 1100 kV direct current transmission through converter valve rectification, the valve winding in converter transformer that is in operation is born direct current simultaneously, exchange, impact, the superposition of the multiple voltage forms such as harmonic wave, require higher for insulation tolerance, in direct current (DC) bias situation, gathering of apparatus insulated inner space electric charge, migration and dissipation characteristic cause converter power transformer running environment more severe, when anti-phase, also to bear reversal of poles voltage at moment of commutation or system conveying capacity, easily cause outgoing line device internal field to concentrate, threaten device security.
Ultrasonic detection technology is a kind of detection method of rising gradually in recent years.There is shelf depreciation in transformer time, can be attended by emitting of acoustic wave energy, sound wave is outwards propagated in different medium (oilpaper, dividing plate, winding and wet goods), arrival is fixed on the calibrate AE sensor on transformer oil tank wall, can play a game and put location, source, but travel path complexity between discharge source and sensor, equivalence velocity of propagation is difficult to determine, and in different medium, propagate meeting decay etc. in acoustic emission signal, play a game and put source location and cause certain difficulty, wherein winding internal discharge cannot position.When on-the-spot shelf depreciation, test product, in complicated electromagnetic interference environment, causes faint local discharge signal to be submerged in very strong various interference, thereby is difficult to obtain real useful information, also just can not the real insulation status of equipment, its reliability, security can not be guaranteed.
In view of this, be necessary to provide one to be applicable to the inner partial discharge positioning method of UHV winding and device, while realizing converter power transformer length, respond to withstand voltage or execute DC break down voltage band partial discharge test outward and disturb identification and winding internal discharge positioning function, to address the above problem.
Summary of the invention
The object of the invention is: for the deficiency of the on-the-spot shelf depreciation antijamming capability of UHV and breakdown Location Techniques, the invention provides a kind of UHV shelf depreciation anti-interference and winding internal discharge localization method and device, obtain local discharge signal proportionate relationship by being built in the fibre optic current sensor of different winding terminals, and analysis and external valve side sleeve pipe, the linked character of the local discharge signal of net side sleeve pipe and iron core grounding, realize the identification of undesired signal in converter power transformer Partial Discharge Testing on Site and multicolumn parallel-connection network side and valve and be sidelong the location of power supply, effectively discriminating device insulation status, for the sex change of expert's comprehensive assessment extra-high voltage converter can provide foundation.
For achieving the above object, the invention provides one and be applicable to the inner shelf depreciation locating device of UHV winding, it is characterized in that, comprise successively by the data flow order of connection: Distributed Feedback Laser, optical fiber polarizer integration module, single-phase three post parallel-connection structure propagation circuits, optical fiber analyzer integration module, PIN photodetector and processing module, the 16 path partiallies inner shelf depreciation positioning system of synchronous detection system, UHV winding of discharging; Wherein in single-phase three post parallel-connection structure propagation circuits, respectively 16 of iron core grounding, valve side sleeve pipe, valve side winding, net side sleeve pipe, net side winding and the built-in full optical-fiber current sensing units of pressure regulation winding outlet, and being numbered respectively 1 ~ 16, its particular location of each sensing unit is as follows: 1 is external iron core grounding fiber-optic current sensor unit; 2,3 and 4 is three post iron core grounding outlet built-in fiber current sensing units; 5 and 6 is external valve side bottom shielding of bushing ground connection fiber-optic current sensor unit; 7,8 and 9 is three column valve side winding upper end outlet built-in fiber current sensing units; 10 is external net side bottom shielding of bushing ground connection fiber-optic current sensor unit; 11,12 and 13 is three post net side winding upper end outlet built-in fiber current sensing units; 14,15 and 16 is three post pressure regulation winding upper end outlet built-in fiber current sensing units; Distributed Feedback Laser is used for giving off light beam; Optical fiber polarizer integration module for light beam is become to polarized light, enters respectively 1 Zhi16 road sensing unit, after the modulation that its polarization state produces magnetic field through pulse current of PD, through optical fiber analyzer integration module form with polarizer polarization direction in the same way with tilt 45
othe two-beam signal of angle, detect by PIN photodetector and processing module, and process respective channel in the same way with the electric signal of incorgruous light beam conversion, obtain 1 ~ 16 tunnel pulsed current signal to be measured, transfer to the 16 path partiallies synchronous detection system of discharging through coaxial shielded cable, transfer to the inner shelf depreciation positioning system of UHV winding through initial analysis and by diagnostic result.
One provided by the invention is applicable to the inner partial discharge positioning method of UHV winding, adopt the inner shelf depreciation locating device of UHV winding that is applicable to as above, it is characterized in that, the shelf depreciation high-frequency pulse current signal that adopts all-fiber current sensor to propagate each winding is monitored, give off light beam by Distributed Feedback Laser, after optical fiber polarizer integration module, become polarized light, enter respectively 1 Zhi16 road sensor fibre, after the modulation that its polarization state produces magnetic field through pulse current of PD, through optical fiber analyzer integration module form with polarizer polarization direction in the same way with tilt 45
othe two-beam signal of angle, detect by PIN photodetector and processing module, and process respective channel in the same way with the electric signal of incorgruous light beam conversion, obtain 1 ~ 16 tunnel pulsed current signal to be measured, transfer to the 16 path partiallies synchronous detection system of discharging through coaxial shielded cable, transfer to the inner shelf depreciation positioning system of UHV winding through initial analysis and by diagnostic result, wherein, the 16 path partiallies pulse signal amplitude in synchronous detection system of discharging is designated as A
1-A
16, iron core grounding monitoring point: A
1≈ A
2+ A
3+ A
4, valve side casing monitoring point: A
5+ A
6≈ A
7+ A
8+ A
9, net side casing monitoring point: A
10≈ A
11+ A
12+ A
13, the maximum amplitude shelf depreciation source position that tentatively extra-high voltage converter is become to single-phase three post parallel-connection structures is carried out definite method and is:
1) iron core grounding monitoring point A
1there is obvious pulse signal, pass through A
2, A
3and A
4pulse amplitude size is differentiated electric discharge core limb:
If A
2≈ A
1, discharge source is positioned at the first core limb;
If A
3≈ A
1, discharge source is positioned at the second core limb;
If A
4≈ A
1, discharge source is positioned at the 3rd core limb;
If A
2, A
3and A
4sum approaches background, is judged to be external interference signal;
2) valve side casing monitoring point A
5and A
6there is obvious pulse signal, pass through A
7, A
8and A
9pulse amplitude size is differentiated electric discharge core limb:
If A
7≈ A
5+ A
6, discharge source is positioned at the first core limb;
If A
8≈ A
5+ A
6, discharge source is positioned at the second core limb;
If A
9≈ A
5+ A
6, discharge source is positioned at the 3rd core limb;
If A
7, A
8and A
9sum approaches background, is judged to be external interference signal;
3) net side casing monitoring point A
10there is obvious pulse signal, pass through A
11, A
12and A
13pulse amplitude size is differentiated electric discharge core limb:
If A
11≈ A
10, discharge source is positioned at the first core limb;
If A
12≈ A
10, discharge source is positioned at the second core limb;
If A
13≈ A
10, discharge source is positioned at the 3rd core limb;
If A
11, A
12and A
13sum approaches background, is judged to be external interference signal.
The invention has the beneficial effects as follows: the present invention is single-phase three posts each valve side winding in parallel, net side winding and the built-in full optical-fiber current sensing unit of pressure regulation winding upper end outlet in ± 1100 kV UHVs, and the electric discharge of identification is effectively and accurately disturbed and region of discharge; The present invention is based on equivalent capacity distributed acquisition shelf depreciation transmission ratio characteristic relation, in conjunction with shelf depreciation calibration steps, set up the eigenwert of the shelf depreciation transfer efficiency demarcation that is applicable to on-the-spot test product; Valve side winding, net side winding and voltage-regulating winding structure order can be according to test product structural adjustments in the present invention, respond to withstand voltage band shelf depreciation and direct current and execute withstand voltage band shelf depreciation outward and can monitor by choosing different passage full optical-fiber current sensing units when long.
Accompanying drawing explanation
Fig. 1 is the single-phase three post parallel-connection structure pulse current propagation circuit figure of UHV of the present invention, in figure: 101. single-phase three post parallel-connection structure propagation circuits; 17. iron core groundings, 18. oil tank wall ground connection, 19. valve side windings, 20. net side windings, 21. pressure regulation windings;
1 is external iron core grounding fiber-optic current sensor unit;
2,3 and 4 is three post iron core grounding outlet built-in fiber current sensing units;
5 and 6 is external valve side bottom shielding of bushing ground connection fiber-optic current sensor unit;
7,8 and 9 is three column valve side winding upper end outlet built-in fiber current sensing units;
10 is external net side bottom shielding of bushing ground connection fiber-optic current sensor unit;
11,12 and 13 is three post net side winding upper end outlet built-in fiber current sensing units;
14,15 and 16 is three post pressure regulation winding upper end outlet built-in fiber current sensing units;
C
ffor valve side winding is to geometric capacitance unshakable in one's determination, calculate the corresponding equivalent capacity of each post winding;
C
fWfor the geometric capacitance between valve side winding and net side winding, calculate the corresponding equivalent capacity of each post winding;
C
wTfor the geometric capacitance between net side winding and pressure regulation winding, calculate the corresponding equivalent capacity of each post winding;
C
tfor the geometric capacitance of pressure regulation winding to fuel tank tank wall, calculate the corresponding equivalent capacity of each post winding;
C
bFfor the electric capacity of valve side sleeve pipe; C
bWfor the electric capacity of net side bushing.
Fig. 2 is the structural drawing of the inner partial discharge positioning method of UHV winding of the present invention and device, in figure: 101. single-phase three post parallel-connection structure propagation circuits, 102.DFB laser instrument, 103. optical fiber polarizer integration modules, 104. optical fiber analyzer integration modules, 105.PIN photodetector and processing module, the 106.16 path partiallies synchronous detection system of discharging, the inner shelf depreciation positioning systems of 107. UHV windings.
Fig. 3 is UHV capacitance profile schematic diagram, in figure: r
0-r
7for the insulation radius of each several part, the reactance height that H is winding.
Fig. 4 is that winding distributes to voltage unshakable in one's determination.
Fig. 5 is that the voltage between winding distributes.
Embodiment
In order to understand better the present invention, further illustrate content of the present invention below in conjunction with embodiment, but content of the present invention is not only confined to the following examples.Those skilled in the art can make various changes or modifications the present invention, and these equivalent form of values are equally within the listed claims limited range of the application.
As shown in Figure 1, be meet ± 1100kV extra-high voltage direct-current large capacity transmission engineering, domestic main design of transformer unit is single-phase three post parallel-connection structures by UHV Design of Main Structure, wherein C
ffor valve side winding is to geometric capacitance unshakable in one's determination, calculate the corresponding equivalent capacity of each post winding, C
f1for corresponding the first post winding electric capacity, C
f2for corresponding the second post winding electric capacity, C
f3for corresponding the 3rd post winding electric capacity, below similarly; C
fWfor the geometric capacitance between valve side winding and net side winding, calculate the corresponding equivalent capacity of each post winding; C
wTfor the geometric capacitance between net side winding and pressure regulation winding, calculate the corresponding equivalent capacity of each post winding; C
tfor the geometric capacitance of pressure regulation winding to fuel tank tank wall, calculate the corresponding equivalent capacity of each post winding; C
bFfor the electric capacity of valve side sleeve pipe; C
bWfor the electric capacity of net side bushing.
In the present invention in ± 1100 kV UHVs single-phase three posts each valve side winding in parallel, net side winding and the built-in full optical-fiber current sensing unit of pressure regulation winding upper end outlet (as shown in Fig. 11 ~ 16), carry out measurement of partial discharge, effectively the inner Partial Discharge Sources regional location of identification winding.
As shown in Figure 2, be the inner partial discharge positioning method of UHV winding and the apparatus structure schematic diagram of being applicable to provided by the invention.The inner shelf depreciation locating device of UHV winding of the present invention comprises: Distributed Feedback Laser 102, optical fiber polarizer integration module 103, single-phase three post parallel-connection structure propagation circuits 101, optical fiber analyzer integration module 104, PIN photodetector and processing module 105,16 path partiallies discharge synchronous detection system 106, the inner shelf depreciation positioning system 107 of UHV winding.
The present invention adopts and is applicable to impulse current measurement, and the shelf depreciation high-frequency pulse current signal that the good all-fiber current sensor of insulation characterisitic is propagated each winding is monitored, give off light beam by Distributed Feedback Laser 102, after optical fiber polarizer integration module 103, become polarized light, enter respectively 1,2 ..., 16 road sensor fibres, its polarization state after pulse current of PD produces the modulation in magnetic field, through optical fiber analyzer integration module 104 form with polarizer polarization direction in the same way with tilt 45
othe two-beam signal of angle, detect by PIN photodetector and processing module 105, and process respective channel in the same way with the electric signal of incorgruous light beam conversion, obtain 1 ~ 16 tunnel pulsed current signal to be measured, transfer to the 16 path partiallies synchronous detection system 106 of discharging through coaxial shielded cable, initial analysis local discharge characteristic information, selects to transfer to the inner shelf depreciation positioning system 107 of UHV winding according to diagnostic result.
Wherein, the 16 path partiallies pulse signal amplitude in synchronous detection system 106 of discharging is designated as A
1-A
16, iron core grounding monitoring point: A
1≈ A
2+ A
3+ A
4, valve side casing monitoring point: A
5+ A
6≈ A
7+ A
8+ A
9, net side casing monitoring point: A
10≈ A
11+ A
12+ A
13.
The maximum amplitude shelf depreciation source position that tentatively extra-high voltage converter is become to single-phase three post parallel-connection structures is determined:
1) iron core grounding monitoring point A
1there is obvious pulse signal, pass through A
2, A
3and A
4pulse amplitude size is differentiated electric discharge core limb:
If A
2≈ A
1, discharge source is positioned at the first core limb;
If A
3≈ A
1, discharge source is positioned at the second core limb;
If A
4≈ A
1, discharge source is positioned at the 3rd core limb;
If A
2, A
3and A
4sum approaches background, is judged to be external interference signal.
2) valve side casing monitoring point A
5and A
6there is obvious pulse signal, pass through A
7, A
8and A
9pulse amplitude size is differentiated electric discharge core limb:
If A
7≈ A
5+ A
6, discharge source is positioned at the first core limb;
If A
8≈ A
5+ A
6, discharge source is positioned at the second core limb;
If A
9≈ A
5+ A
6, discharge source is positioned at the 3rd core limb;
If A
7, A
8and A
9sum approaches background, is judged to be external interference signal.
3) net side casing monitoring point A
10there is obvious pulse signal, pass through A
11, A
12and A
13pulse amplitude size is differentiated electric discharge core limb:
If A
11≈ A
10, discharge source is positioned at the first core limb;
If A
12≈ A
10, discharge source is positioned at the second core limb;
If A
13≈ A
10, discharge source is positioned at the 3rd core limb;
If A
11, A
12and A
13sum approaches background, is judged to be external interference signal.
1, equivalent capacity is calculated.
When UHV is long, respond in withstand voltage band partial discharge test, test product electric current is capacitive.Due to induced voltage difference between each winding, same winding voltage (over the ground) is distributed by the number of turn, between winding and winding-to-earth capacity be distribution parameter, capacitance current distributes more complicated, can represent between winding or winding equivalent capacitance over the ground with a lumped parameter, between its numerical value and each winding and when geometric capacitance over the ground of winding, static exciter between each winding and winding voltage over the ground relevant.
1) transformer geometric capacitance is calculated.
As shown in Figure 3, each electric capacity geometric capacitance computing formula is as follows:
In formula, 1.15-edge effect increases capacitance coefficient; Φ-referring factor (press coaxial clyinder between fuel tank and pressure regulation winding and calculate electric capacity, need be multiplied by Φ), Φ=0.75; ε r, ε r '-dielectric coefficient; r
0-r
7for the insulation radius of each several part; H is the reactance height of winding.
2) the capacitance energy storage formula between Transformer Winding and iron core (fuel tank).
As shown in Figure 4, valve side winding to total capacitance unshakable in one's determination is
(be
c f or
c t ), and edge
be uniformly distributed; Winding two ends are respectively voltage unshakable in one's determination
with
, and winding voltage edge
be uniformly distributed.
(2)
Charge power total in capacitor C is:
3) the capacitance energy storage formula between Transformer Winding.
By in formula (3)
with
replace respectively the voltage between electric capacity two-plate end
with
, formula (3) becomes electric capacity between winding
(be
c fW or
c wT ) energy storage formula.As shown in Figure 4, establishing right side winding both end voltage is respectively
with
, left side winding both end voltage is respectively
with
, point
place's voltage is:
If
,
, above formula becomes
.
Charge power total in capacitor C is:
4) equivalent capacity is calculated.
With the ceiling voltage of winding
for benchmark pair
with
get perunit value, convert formula (5) to charge power
with
relational expression, in the hope of
under equivalent capacitance.Formula (5) can be write as:
If
for equivalent capacitance:
If
;
, above formula can be simplified to following form:
Can calculate each column valve side to equivalent capacitance unshakable in one's determination by the method
,
,
, equivalent capacitance between each column valve side winding and net side winding
,
,
, equivalent capacitance between each post net side winding and pressure regulation winding
,
,
, each post pressure regulation winding is to oil tank wall equivalent capacitance
,
,
.Obtain the electric capacity of net side high-pressure side sleeve pipe and valve side sleeve pipe according to on-the-spot test product technical information inventory
,
,
.
2, shelf depreciation transfer efficiency eigenwert
1) transfer efficiency eigenwert is put in valve side winding office.
By valve side winding outlet casing tube short circuit, squeeze into respectively 500pC, 1000pC and 2000pC calibration electric charge by JFD-301 calibration pulse generator to valve side winding, 16 passages are received to Apparent discharge magnitude peak value and be designated as respectively
-
,
-
,
-
, signal amplitude is that ground unrest is designated as zero.And in the time of calibration, do not apply voltage, respectively calibrate equivalent capacity under the quantity of electric charge and adopt geometric capacitance to replace.
If when calibration electric charge is 500pC,
, and
time, will
-
be made as standard calibration characteristic parameter; As do not meet, and
, and
time, will
-
be made as standard calibration characteristic parameter, as do not meet, will
-
be made as standard calibration characteristic parameter.
If converter power transformer partial discharge test is at valve side sleeve pipe
with
the actual Apparent discharge magnitude that detects amounts to
, and discharge source is positioned at valve side winding region, and actual total discharge capacity is not more than:
2) transfer efficiency eigenwert is put in net side winding office.
Squeeze into 500pC, 1000pC and 2000pC calibration electric charge by JFD-301 calibration pulse generator to net side winding high-pressure side outlet casing tube, 16 passages are received to Apparent discharge magnitude and be designated as respectively
-
,
-
,
-
, signal amplitude is that ground unrest is designated as zero.And in the time of calibration, do not apply voltage, respectively calibrate equivalent capacity under the quantity of electric charge and adopt geometric capacitance to replace.
(9)
If when calibration electric charge is 500pC,
, and
time, will
-
be made as standard calibration characteristic parameter; As do not meet, and
, and
time, will
-
be made as standard calibration characteristic parameter, as do not meet, will
-
be made as standard calibration characteristic parameter.
If converter power transformer partial discharge test is at net side sleeve pipe
the actual Apparent discharge magnitude that detects is
, and discharge source is positioned at net side winding region, and actual total discharge capacity is not more than:
3) transfer efficiency eigenwert is put in pressure regulation winding office.
By pressure regulation winding outlet casing tube short circuit, squeeze into respectively 500pC, 1000pC and 2000pC calibration electric charge by JFD-301 calibration pulse generator to pressure regulation winding, 16 passages are received to Apparent discharge magnitude and be designated as respectively
-
,
-
,
-
, signal amplitude is that ground unrest is designated as zero.And in the time of calibration, do not apply voltage, respectively calibrate equivalent capacity under the quantity of electric charge and adopt geometric capacitance to replace.
If when calibration electric charge is 500pC,
time, will
-
be made as standard calibration characteristic parameter; As do not meet,
time, will
-
be made as standard calibration characteristic parameter, as do not meet, will
-
be made as standard calibration characteristic parameter.
3, the anti-interference and zone location of shelf depreciation in winding
1) disturb identification.
In this detection system, passage 1,5,6 and 10 is respectively iron core grounding, valve side bottom shielding of bushing ground connection and net side bottom shielding of bushing ground connection pulsed current signal monitoring point, easily receive the undesired signal in external electromagnetic loop, rest channels is built-in sensing unit, can effectively shield interference, can differentiate in the following way:
(1) when 1 passage receives pulse signal, and 2,3 and 4 passages do not receive signal amplitude sum while being greater than 1 channel signal, are earth mat undesired signal;
(2) when 5 and 6 passages receive pulse signal, and 7,8 and 9 passages are not while receiving effective identification signal, and reorganizing signal is undesired signal;
(3) in the time that 10 passages receive pulse signal, and 11,12 and 13 passages are not while receiving effective identification signal, and this group signal is undesired signal.
2) location, winding internal discharge source.
± 1100 kV UHV transmission line capabilities are very big, single-phase converter transformer body is three post parallel connections according to current design, both sides yoke piece becomes, its winding volume is huge, can not effective location winding internal discharge according to existing ultrasound wave location technology, fundamental purpose of the present invention provides winding internal discharge area positioning technology for this UHV, and concrete recognition methods is as follows:
(1) winding position of the pulse-peak time sequence principium identification discharge source by external sensing unit 1,5,6 and 10 passages, if 5 and 6 passage amplitudes are much larger than 1 and 10 passage amplitudes, main discharge source is tentatively decided to be valve side winding, by that analogy, judge respectively whether net side winding and iron core exist main discharge source;
(2) if principium identification main discharge source at valve side winding, check on the same group in signal, if 7 channel signal amplitudes are much larger than 8 and 9 passages, there is the signal of calibration ratio in 11 passages and 2 passages simultaneously, can judge that discharge source is positioned at the valve side winding near zone of the first winding post, three column valve sides and net side winding all can the like differentiate discharge source belonging positions;
(3) if 1,2,3 can judge that much larger than other channel signal amplitude discharge source is with unshakable in one's determination associated larger with 4 channel signal amplitudes;
(4) if 14,15 and 16 channel signal amplitudes are larger, rest channels signal amplitude is relatively little, can principium identification be the peripheral electric discharge of device body or relevant with pressure regulation winding, can adopt ultrasound wave location technology to detect.
Valve side winding, net side winding and voltage-regulating winding structure order can be according to test product structural adjustments in the present invention, respond to withstand voltage band shelf depreciation and direct current and execute withstand voltage band shelf depreciation outward and can monitor by choosing different passage full optical-fiber current sensing units when long.
Claims (2)
1. one kind is applicable to the inner shelf depreciation locating device of UHV winding, it is characterized in that, comprise successively by the data flow order of connection: Distributed Feedback Laser, optical fiber polarizer integration module, single-phase three post parallel-connection structure propagation circuits, optical fiber analyzer integration module, PIN photodetector and processing module, the 16 path partiallies inner shelf depreciation positioning system of synchronous detection system, UHV winding of discharging; Wherein in single-phase three post parallel-connection structure propagation circuits, respectively 16 of iron core grounding, valve side sleeve pipe, valve side winding, net side sleeve pipe, net side winding and the built-in full optical-fiber current sensing units of pressure regulation winding outlet, and being numbered respectively 1 ~ 16, its particular location of each sensing unit is as follows: 1 is external iron core grounding fiber-optic current sensor unit; 2,3 and 4 is three post iron core grounding outlet built-in fiber current sensing units; 5 and 6 is external valve side bottom shielding of bushing ground connection fiber-optic current sensor unit; 7,8 and 9 is three column valve side winding upper end outlet built-in fiber current sensing units; 10 is external net side bottom shielding of bushing ground connection fiber-optic current sensor unit; 11,12 and 13 is three post net side winding upper end outlet built-in fiber current sensing units; 14,15 and 16 is three post pressure regulation winding upper end outlet built-in fiber current sensing units; Distributed Feedback Laser is used for giving off light beam; Optical fiber polarizer integration module for light beam is become to polarized light, enters respectively 1 Zhi16 road sensing unit, after the modulation that its polarization state produces magnetic field through pulse current of PD, through optical fiber analyzer integration module form with polarizer polarization direction in the same way with tilt 45
othe two-beam signal of angle, detect by PIN photodetector and processing module, and process respective channel in the same way with the electric signal of incorgruous light beam conversion, obtain 1 ~ 16 tunnel pulsed current signal to be measured, transfer to the 16 path partiallies synchronous detection system of discharging through coaxial shielded cable, transfer to the inner shelf depreciation positioning system of UHV winding through initial analysis and by diagnostic result.
2. one kind is applicable to the inner partial discharge positioning method of UHV winding, adopt the inner shelf depreciation locating device of UHV winding that is applicable to as claimed in claim 1, it is characterized in that, the shelf depreciation high-frequency pulse current signal that adopts all-fiber current sensor to propagate each winding is monitored, give off light beam by Distributed Feedback Laser, after optical fiber polarizer integration module, become polarized light, enter respectively 1 Zhi16 road sensor fibre, after the modulation that its polarization state produces magnetic field through pulse current of PD, through optical fiber analyzer integration module form with polarizer polarization direction in the same way with tilt 45
othe two-beam signal of angle, detect by PIN photodetector and processing module, and process respective channel in the same way with the electric signal of incorgruous light beam conversion, obtain 1 ~ 16 tunnel pulsed current signal to be measured, transfer to the 16 path partiallies synchronous detection system of discharging through coaxial shielded cable, transfer to the inner shelf depreciation positioning system of UHV winding through initial analysis and by diagnostic result, wherein, the 16 path partiallies pulse signal amplitude in synchronous detection system of discharging is designated as A
1-A
16, iron core grounding monitoring point: A
1≈ A
2+ A
3+ A
4, valve side casing monitoring point: A
5+ A
6≈ A
7+ A
8+ A
9, net side casing monitoring point: A
10≈ A
11+ A
12+ A
13, the maximum amplitude shelf depreciation source position that tentatively extra-high voltage converter is become to single-phase three post parallel-connection structures is carried out definite method and is:
1) iron core grounding monitoring point A
1there is obvious pulse signal, pass through A
2, A
3and A
4pulse amplitude size is differentiated electric discharge core limb:
If A
2≈ A
1, discharge source is positioned at the first core limb;
If A
3≈ A
1, discharge source is positioned at the second core limb;
If A
4≈ A
1, discharge source is positioned at the 3rd core limb;
If A
2, A
3and A
4sum approaches background, is judged to be external interference signal;
2) valve side casing monitoring point A
5and A
6there is obvious pulse signal, pass through A
7, A
8and A
9pulse amplitude size is differentiated electric discharge core limb:
If A
7≈ A
5+ A
6, discharge source is positioned at the first core limb;
If A
8≈ A
5+ A
6, discharge source is positioned at the second core limb;
If A
9≈ A
5+ A
6, discharge source is positioned at the 3rd core limb;
If A
7, A
8and A
9sum approaches background, is judged to be external interference signal;
3) net side casing monitoring point A
10there is obvious pulse signal, pass through A
11, A
12and A
13pulse amplitude size is differentiated electric discharge core limb:
If A
11≈ A
10, discharge source is positioned at the first core limb;
If A
12≈ A
10, discharge source is positioned at the second core limb;
If A
13≈ A
10, discharge source is positioned at the 3rd core limb;
If A
11, A
12and A
13sum approaches background, is judged to be external interference signal.
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| CN105182196A (en) * | 2015-09-11 | 2015-12-23 | 四川菲博斯科技有限责任公司 | Partial transformer discharging monitoring evaluation system based on fiber |
| CN108303625A (en) * | 2018-02-08 | 2018-07-20 | 全球能源互联网欧洲研究院 | Cable run partial discharge monitoring device, method, terminal and readable storage medium storing program for executing |
| CN111426920A (en) * | 2020-04-16 | 2020-07-17 | 许继集团有限公司 | Fire/arc detection device and method applied to high-voltage direct-current transmission converter valve |
| CN111458604A (en) * | 2019-12-27 | 2020-07-28 | 广东电网有限责任公司电力科学研究院 | Transformer self-sensing-based oscillation type lightning impulse test system and method |
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| CN105182196A (en) * | 2015-09-11 | 2015-12-23 | 四川菲博斯科技有限责任公司 | Partial transformer discharging monitoring evaluation system based on fiber |
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| CN111426920B (en) * | 2020-04-16 | 2022-11-29 | 许继集团有限公司 | Fire and/or arc detection device and method for high-voltage direct-current transmission converter valve |
| CN114217182A (en) * | 2021-11-25 | 2022-03-22 | 广东电网有限责任公司广州供电局 | Flexible-direct transformer low-voltage winding operation insulation level checking method and device |
| CN114217182B (en) * | 2021-11-25 | 2023-08-08 | 广东电网有限责任公司广州供电局 | Method and device for evaluating operation insulation level of low-voltage winding of flexible direct-current transformer |
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Effective date of registration: 20160412 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant after: State Grid Corporation of China Applicant after: Nanjing Nari Co., Ltd. Applicant after: Wuhan Nari Limited Liability Company of State Grid Electric Power Research Institute Applicant after: State Grid Hubei Electric Power Company Electric Power Technology Research Institute Address before: 430074 Hubei Province, Wuhan city Hongshan District Luoyu Road No. 143 Applicant before: Wuhan Nari Limited Liability Company of State Grid Electric Power Research Institute |