CN105319487A - Transformer station partial discharge signal detection and positioning system and method - Google Patents

Abstract

The invention discloses a transformer station partial discharge signal detection and positioning system, used for detecting the ultrahigh frequency electromagnetic wave excited by partial discharge of transformer station equipment discharge points, and positioning the discharge points. The system comprises four ultrahigh frequency omnidirectional antenna receiving and amplifying modules used for receiving, amplifying and filtering the ultrahigh frequency electromagnetic wave excited by partial discharge, and then outputting four paths of signals; a superspeed data acquisition unit for collecting the outputted four paths of signals, and converting the four paths of signals into corresponding four paths of data for output; and a data processing and analysis unit used for processing and analyzing the four paths of data, and calculating discharge point coordinate vales based on four beginning times at which the ultrahigh frequency electromagnetic wave excited by partial discharge arrives at the four ultrahigh frequency omnidirectional antenna receiving and amplifying modules, so as to position the discharge points. The invention also discloses a transformer station partial discharge signal detection and positioning method.

Description

Transformer station partial discharge signals detection and positioning system and method

Technical field

The present invention relates to the system and method for a kind of input and location, particularly relate to a kind of system and method local discharge signal being carried out to detection and positioning.

Background technology

Insulation fault is that power equipment is in operation one of topmost possible breakdown, before power equipment generation insulation fault, generally all can have a shelf depreciation process developed gradually, finally cause insulation breakdown.If can carry out partial discharge monitoring and diagnosis to operational outfit in this process, Timeliness coverage local discharge signal, processes defect in advance, just effectively can avoid the generation of Fault of Insulating Breakdown.Meanwhile, to the location of partial discharge position, contribute to formulating overhaul plan scheme more targetedly, reduce power off time, improve overhaul efficiency.

Shelf depreciation detects by the multiple method such as ultrasound wave, electric parameter constant and superfrequency electromagnetic wave.These methods all can be used to do partial discharge location.Superfrequency (UHF) Electromagnetic Wave Method is a kind of new method of Partial Discharge Detection, and super high band (300 ~ 3000MHz) signal that the method is received in the electromagnetic wave of shelf depreciation process institute radiation in power equipment by UHF-antenna sensor detects shelf depreciation.The advantage of superfrequency Electromagnetic Wave Detection is: detect frequency range higher, effectively can avoid the multiple electrical Interference such as corona, switching manipulation in conventional measurement of partial discharge; Measurement bandwidth is wide, so its detection sensitivity is very high, and the aerial velocity of propagation of electromagnetic wave is similar to the light velocity, can be used for the discharge position that calculating office puts.

The existing shelf depreciation to power equipment detects and the method for locating is substantially all detect for the shelf depreciation of single substation equipment (GIS, transformer, capacitive apparatus etc.) both at home and abroad, and positions according to the acoustical signal collected and electric signal.There is following defect in this monitoring thinking: any high voltage electric power equip ment in transformer station all partial discharges fault may occur, want to implement monitoring to an electrical equipment at full station, just need all partial discharge monitoring device to be installed on each device, this needs the time of at substantial, financial resources carry out equipment purchase, install; The dissimilar instrument of many covers need be carried, operation inconvenience during test; The maintenance and management of numerous monitoring device also needs time and the manpower of at substantial.This monitoring form is difficult to adapt to intelligent substation telemanagement from now on and few man on duty.

Summary of the invention

The object of the present invention is to provide a kind of transformer station partial discharge signals detection and positioning system, it can implement local discharge signal detection and positioning to the equipment within the scope of transformer station full station.

Another object of the present invention is to provide a kind of transformer station partial discharge signals detection and positioning method, the method has above-mentioned functions equally.

To achieve these goals, the present invention proposes a kind of transformer station partial discharge signals detection and positioning system, the superfrequency electromagnetic wave that the shelf depreciation produced for detecting substation equipment point of discharge excites, and position described point of discharge, it comprises:

Four ultrahigh frequency omnidirectional antennas receive amplification module, wherein each ultrahigh frequency omnidirectional antenna receives amplification module and includes ultrahigh frequency omnidirectional antenna and connected wideband pre-amplifier, wherein said ultrahigh frequency omnidirectional antenna receives the superfrequency electromagnetic wave that described shelf depreciation excites, and is amplified it by described wideband pre-amplifier and export four road signals after filtering;

There is the ultra-high-speed data acquisition unit of at least four tunnel inputs, the output that the input of its four tunnel and described four ultrahigh frequency omnidirectional antennas receive the wideband pre-amplifier of amplification module is connected respectively, to gather described four road signals respectively, and Jiang Gai tetra-road signal is converted to corresponding four circuit-switched data outputs;

Data processing and analytic unit, it is connected with described ultra-high-speed data acquisition unit, receives its four circuit-switched data exported and processes this four circuit-switched data and analyze, comprising step:

(1) described four circuit-switched data are processed and analyzed, obtain superfrequency electromagnetic wave that described shelf depreciation excites and arrive four moment that described four ultrahigh frequency omnidirectional antennas receive the ultrahigh frequency omnidirectional antenna of amplification module corresponding four initial times dt1, dt2, dt3 and dt4;

(2) three-dimensional coordinate system is set up, if the coordinate that described four ultrahigh frequency omnidirectional antennas receive the ultrahigh frequency omnidirectional antenna of amplification module is respectively known (x ₁, y ₁, z ₁), (x ₂, y ₂, z ₂), (x ₃, y ₃, z ₃) and (x ₄, y ₄, z ₄), point of discharge coordinate is (x, y, z), and the distance that point of discharge receives the ultrahigh frequency omnidirectional antenna of amplification module to described four ultrahigh frequency omnidirectional antennas is respectively d ₁, d ₂, d ₃and d ₄, list the system of equations about described point of discharge coordinate (x, y, z) based on described four initial times dt1, dt2, dt3 and dt4:

d ₂-d ₁＝vΔT ₂

d ₃-d ₁＝vΔT ₃

d ₄-d ₁＝vΔT ₄

Wherein, Δ T ₂=dt2-dt1, Δ T ₃=dt3-dt1, Δ T ₄=dt4-dt1; i=1,2,3,4; Propagation velocity of electromagnetic wave v=3.0 × 10 ⁸m/s;

(3) described system of equations is solved, obtain the value of described point of discharge coordinate (x, y, z), to position described point of discharge.

Transformer station partial discharge signals detection and positioning system of the present invention, the antenna array of the ultrahigh frequency omnidirectional antenna formation of amplification module is received based on described four ultrahigh frequency omnidirectional antennas, can carry out to the equipment within the scope of transformer station full station the electromagnetic detection of superfrequency that shelf depreciation excites, and position producing the electromagnetic point of discharge of superfrequency that described shelf depreciation excites.Wherein, four ultrahigh frequency omnidirectional antennas receive the ultrahigh frequency omnidirectional antenna of amplification module for receiving described superfrequency electromagnetic wave, because described superfrequency electromagnetic wave has the mistiming between four moment that described four ultrahigh frequency omnidirectional antennas of described point of discharge arrival receive the ultrahigh frequency omnidirectional antenna of amplification module, and the position that described four ultrahigh frequency omnidirectional antennas receive the ultrahigh frequency omnidirectional antenna of amplification module is known, therefore can establish an equation based on the position of described mistiming to point of discharge and solve, to position described point of discharge.

Transformer station partial discharge signals detection and positioning system of the present invention, change the Normal practice in the past individual equipment being installed to on-Line Monitor Device, by a set of detection and positioning system, the equipment within the scope of transformer station full station is carried out to the detection of local discharge signal, obtain the shelf depreciation information of whole substation areas of transformer station, cost is low, and efficiency is high, finds defect in advance when contributing to patrolling and examining substation equipment, reduce the generation of power outage, thus improve the intelligent level of transformer station.

Further, in transformer station partial discharge signals detection and positioning system of the present invention, in described step (1), described four initial times dt1, dt2, dt3 and dt4 are corresponding four the cumlative energy points of inflexion on a curve obtained by described four circuit-switched data respectively, and described cumlative energy curve is by formula obtain, wherein u _kfor the magnitude of voltage of the point of kth in the signal waveform that obtained by described data convert, j is counting of signal waveform record.

In such scheme, the principle of described step (1) is, when a partial discharge event occurs, point of discharge will give off a pulse, the amplitude of this pulse is much larger than ground unrest, through energy accumulation, described pulse will form a flex point on energy accumulation curve, and moment corresponding to this flex point is described initial time.

Further, in of the present invention or above-mentioned transformer station partial discharge signals detection and positioning system, the method for solving of described step (3) adopts successively grid data service:

Write described system of equations as vector form, wherein X=(x, y, z) ^t, then

$\stackrel{\→}{F}\left(X\right)=\left(\begin{array}{c}{d}_2-d_1-v\mathrm{\Δ}{T}_2\\ d_3-d_1-{\mathrm{v\ΔT}}_3\\ d_4-d_1-{\mathrm{v\ΔT}}_4\end{array}\right);$

First ground floor search is carried out:

At point of discharge coordinate (x, y, z) ∈ [x _min1, x _max1] × [y _min1, y _max1] × [z _min1, z _max1] interior with D ₁for IV interval minimum value, obtain the coordinate (x that this minimum value is corresponding _s1, y _s1, z _s1);

Then second layer search is carried out:

At (x, y, z) ∈ [x _s1?D ₁, x _s1+ D ₁] × [y _s1?D ₁, y _s1+ D ₁] × [z _s1?D ₁, z _s1+ D ₁] interior with D ₂for IV interval minimum value, obtain the coordinate (x that this minimum value is corresponding _s2, y _s2, z _s2);

In above-mentioned steps, (x, y, z) ∈ [x _min1, x _max1] × [y _min1, y _max1] × [z _min1, z _max1] be point of discharge coordinate affiliated area maximum magnitude, D ₂determine point of discharge coordinate setting precision, (x _s2, y _s2, z _s2) for finally solving the value of the point of discharge coordinate (x, y, z) obtained.

In such scheme, the required system of equations of separating of described step (3) is Nonlinear System of Equations.

Usual Nonlinear System of Equations can solve by Newton method, and its principle is:

If above-mentioned $\stackrel{\→}{F}\left(X\right)=\left(\begin{array}{c}{d}_2-d_1-v\mathrm{\Δ}{T}_2\\ d_3-d_1-{\mathrm{v\ΔT}}_3\\ d_4-d_1-{\mathrm{v\ΔT}}_4\end{array}\right)\stackrel{\mathrm{\Δ}}{=}\left(\begin{array}{c}{f}_1\left(X\right)\\ f_2\left(X\right)\\ f_3\left(X\right)\end{array}\right)---\left(1\right)$

If X _k=(x _k, y _k, z _k) ^tfor an approximate solution of system of equations, then to i=1,2,3 have

$f_i\left(X\right)\≈f_i\left(X_k\right)+\frac{\∂f_i\left(X_k\right)}{\∂x_k}(x-x_k)+\frac{\∂f_i\left(X_k\right)}{\∂y_k}(y-y_k)+\frac{\∂f_i\left(X_k\right)}{\∂z_k}(z-z_k)$

Being write as vector form is $\stackrel{\→}{F}\left(X\right)\≈\stackrel{\→}{F}\left(X_k\right)+{\stackrel{\→}{F}}^{\′}\left(X_k\right)(X-X_k)---\left(2\right)$

Wherein for jacobi matrix at X _kthe value at place.If X value is the root X of system of equations (1) ^*, namely therefore make formula (2) right-hand member be the vectorial X of 0 as new approximate value, be designated as X _k+1, namely have:

$X_{k+1}=X_k-{\left({\stackrel{\→}{F}}^{\′}\right(X_k\left)\right)}^{-1}\stackrel{\→}{F}\left(X_k\right)---\left(3\right)$

Formula (3) is the iterative formula of Newton Algorithm Nonlinear System of Equations.

The condition of Newton Algorithm Nonlinear System of Equations iteration convergence is comparatively strong, i.e. algorithm requirement at X ^*open neighborhood on can lead continuously, and reversible.And in the discharge measuring of reality calculates, due to the impact of the factor such as interference noise, measuring error, cause solution of equations not exist or not uniquely, now utilize Newton iterative method not restrain.Therefore, when Newton iterative method is not restrained, such scheme adopts successively grid data service to solve.

Such scheme gives the design and the implementation that solve the required system of equations of separating of described step (3) based on successively grid data service in the mode that two-grid is searched for; based on this design and implementation; can not creative work be carried out and obtain the grid search implementation of any number of plies, therefore just optimizing demand according to actual computation and the number of plies adjustment carried out should be regarded as falling into the respective range of application claims protection.

In actual applications, its function embodiment is that determine to carry out analysing in depth and locating after equipment or part of appliance have had defect pipelines risk, cost is low again, and efficiency is high by first roughly selecting defective equipment or part of appliance to the successively grid data service of such scheme.

Further, in transformer station partial discharge signals detection and positioning system of the present invention, described four ultrahigh frequency omnidirectional antennas receive amplification module and are arranged on movable equipment.

Such scheme is arranged on movable equipment by described four ultrahigh frequency omnidirectional antennas are received amplification module, such as, be arranged on automobile, sensing range is defined more flexible, reduce further cost, improve efficiency.

Further, in transformer station partial discharge signals detection and positioning system of the present invention, described ultra-high-speed data acquisition unit is high-speed oscilloscope.

Further, in transformer station partial discharge signals detection and positioning system of the present invention, described data processing and analytic unit are computing machine, and this computing machine can be portable computer.

Correspondingly, present invention also offers a kind of transformer station partial discharge signals detection and positioning method, the superfrequency electromagnetic wave that the shelf depreciation produced for detecting substation equipment point of discharge excites, and position described point of discharge, it comprises step:

(1) ultrahigh frequency omnidirectional antenna receiving amplification modules by four ultrahigh frequency omnidirectional antennas receives the superfrequency electromagnetic wave that described shelf depreciation excites, and is amplified it by the wideband pre-amplifier that four ultrahigh frequency omnidirectional antennas receive amplification modules and exported four road signals after filtering;

(2) the four tunnel inputs by having the ultra-high-speed data acquisition unit of at least four tunnel inputs gather described four road signals respectively, and Jiang Gai tetra-road signal is converted to corresponding four circuit-switched data outputs;

(3) by data processing and analytic unit, described four circuit-switched data are processed and are analyzed, comprise step:

(3a) described four circuit-switched data are processed and analyzed, obtain superfrequency electromagnetic wave that described shelf depreciation excites and arrive four moment that described four ultrahigh frequency omnidirectional antennas receive the ultrahigh frequency omnidirectional antenna of amplification module corresponding four initial times dt1, dt2, dt3 and dt4;

(3b) three-dimensional coordinate system is set up, if the coordinate that described four ultrahigh frequency omnidirectional antennas receive the ultrahigh frequency omnidirectional antenna of amplification module is respectively known (x ₁, y ₁, z ₁), (x ₂, y ₂, z ₂), (x ₃, y ₃, z ₃) and (x ₄, y ₄, z ₄), point of discharge coordinate is (x, y, z), and the distance that point of discharge receives the ultrahigh frequency omnidirectional antenna of amplification module to described four ultrahigh frequency omnidirectional antennas is respectively d ₁, d ₂, d ₃and d ₄, list the system of equations about described point of discharge coordinate (x, y, z) based on described four initial times dt1, dt2, dt3 and dt4:

d ₂-d ₁＝vΔT ₂

d ₃-d ₁＝vΔT ₃

d ₄-d ₁＝vΔT ₄

Wherein, Δ T ₂=dt2-dt1, Δ T ₃=dt3-dt1, Δ T ₄=dt4-dt1; i=1,2,3,4; Propagation velocity of electromagnetic wave v=3.0 × 10 ⁸m/s;

(3c) described system of equations is solved, obtain the value of described point of discharge coordinate (x, y, z), to position described point of discharge.

The design of transformer station partial discharge signals detection and positioning method of the present invention is consistent with the design of transformer station partial discharge signals detection and positioning system of the present invention, does not repeat them here.

Further, in transformer station partial discharge signals detection and positioning method of the present invention, in described step (3a), described four initial times dt1, dt2, dt3 and dt4 are corresponding four the cumlative energy points of inflexion on a curve obtained by described four circuit-switched data respectively, and described cumlative energy curve is by formula obtain, wherein u _kfor the magnitude of voltage of the point of kth in the signal waveform that obtained by described data convert, j is counting of signal waveform record.

Further, in of the present invention or above-mentioned transformer station partial discharge signals detection and positioning method, the method for solving of described step (3c) adopts successively grid data service:

Write described system of equations as vector form, wherein X=(x, y, z) ^t, then

$\stackrel{\→}{F}\left(X\right)=\left(\begin{array}{c}{d}_2-d_1-v\mathrm{\Δ}{T}_2\\ d_3-d_1-{\mathrm{v\ΔT}}_3\\ d_4-d_1-{\mathrm{v\ΔT}}_4\end{array}\right);$

First ground floor search is carried out:

At point of discharge coordinate (x, y, z) ∈ [x _min1, x _max1] × [y _min1, y _max1] × [z _min1, z _max1] interior with D ₁for IV interval minimum value, obtain the coordinate (x that this minimum value is corresponding _s1, y _s1, z _s1);

Then second layer search is carried out:

At (x, y, z) ∈ [x _s1?D ₁, x _s1+ D ₁] × [y _s1?D ₁, y _s1+ D ₁] × [z _s1?D ₁, z _s1+ D ₁] interior with D ₂for IV interval minimum value, obtain the coordinate (x that this minimum value is corresponding _s2, y _s2, z _s2);

In above-mentioned steps, (x, y, z) ∈ [x _min1, x _max1] × [y _min1, y _max1] × [z _min1, z _max1] be point of discharge coordinate affiliated area maximum magnitude, D ₂determine point of discharge coordinate setting precision, (x _s2, y _s2, z _s2) for finally solving the value of the point of discharge coordinate (x, y, z) obtained.

Such scheme gives the design and the implementation that solve the required system of equations of separating of described step (3c) based on successively grid data service in the mode that two-grid is searched for; based on this design and implementation; can not creative work be carried out and obtain the grid search implementation of any number of plies, therefore just optimizing demand according to actual computation and the number of plies adjustment carried out should be regarded as falling into the respective range of application claims protection.

Transformer station partial discharge signals detection and positioning system of the present invention compared with prior art, has following beneficial effect:

1) Normal practice in the past individual equipment being installed to on-Line Monitor Device is changed, by a set of detection and positioning system, the equipment within the scope of transformer station full station is carried out to the detection of local discharge signal, obtain the shelf depreciation information of whole substation areas of transformer station, cost is low, and efficiency is high;

2) find defect in advance when contributing to patrolling and examining substation equipment, reduce the generation of power outage, thus improve the intelligent level of transformer station.

Transformer station partial discharge signals detection and positioning method of the present invention has above-mentioned effect equally.

Accompanying drawing explanation

Fig. 1 is the general frame schematic diagram of transformer station partial discharge signals detection and positioning system of the present invention under a kind of embodiment.

Fig. 2 is the cumlative energy curve example of transformer station partial discharge signals detection and positioning system of the present invention under a kind of embodiment.

Fig. 3 is the flex point place enlarged drawing of Fig. 2.

Fig. 4 is the laboratory antenna array coordinate schematic diagram of transformer station partial discharge signals detection and positioning system of the present invention under a kind of embodiment.

Fig. 5 is the on-the-spot antenna array coordinate schematic diagram of transformer station partial discharge signals detection and positioning system of the present invention under a kind of embodiment.

Embodiment

Below in conjunction with Figure of description and specific embodiment, further explanation and explanation are made to transformer station partial discharge signals detection and positioning system and method for the present invention.

Fig. 1 illustrates the general frame of transformer station partial discharge signals detection and positioning system of the present invention under a kind of embodiment.

As shown in Figure 1, the superfrequency electromagnetic wave that the present embodiment system excites for the shelf depreciation detecting the generation of substation equipment point of discharge, and point of discharge is positioned, comprise: four ultrahigh frequency omnidirectional antennas that ultrahigh frequency omnidirectional antenna 1 ~ 4 and the wideband pre-amplifier 1 ~ 4 that connect corresponding to it form receive amplification module, wherein each ultrahigh frequency omnidirectional antenna receives amplification module and includes ultrahigh frequency omnidirectional antenna and connected wideband pre-amplifier, the wherein discharge excited superfrequency electromagnetic wave of ultrahigh frequency omnidirectional antenna 1 ~ 4 local, and by wideband pre-amplifier 1 ~ 4, it amplified and after filtering, export four road signals, as the high-speed oscilloscope of ultra-high-speed data acquisition unit, there are four tunnel inputs and band memory function, the input of this four tunnel is connected respectively with the output of wideband pre-amplifier 1 ~ 4, to gather four road signals respectively, and Jiang Gai tetra-road signal with unified time coordinate be converted to corresponding four road synchronous acquisitions be stored in high-speed oscilloscope be provided as data processing and analytic unit portable computer read, four circuit-switched data stored in portable computer reading high-speed oscilloscope also process this four circuit-switched data and analyze, and calculate point of discharge coordinate, to position point of discharge.

Fig. 2 illustrates the cumlative energy curve example of the present embodiment system; Fig. 3 is the flex point place enlarged drawing of Fig. 2.

In above-mentioned the present embodiment system, portable computer to the step that above-mentioned four circuit-switched data process and analyze is:

(1) above-mentioned four circuit-switched data are processed and analyzed, obtain superfrequency electromagnetic wave that shelf depreciation excites and arrive four moment of ultrahigh frequency omnidirectional antenna 1 ~ 4 corresponding four initial times dt1, dt2, dt3 and dt4; As shown in Fig. 2 and Fig. 3 exemplarily, the flex point of these four initial times dt1, dt2, dt3 and dt4 corresponding four cumlative energy curves 1 ~ 4 obtained by four circuit-switched data respectively, cumlative energy curve is by formula obtain, wherein u _kfor the magnitude of voltage of the point of kth in the signal waveform that obtained by data convert, j is counting of signal waveform record;

(2) three-dimensional coordinate system is set up, if the coordinate of ultrahigh frequency omnidirectional antenna 1 ~ 4 is respectively known (x ₁, y ₁, z ₁), (x ₂, y ₂, z ₂), (x ₃, y ₃, z ₃) and (x ₄, y ₄, z ₄), point of discharge coordinate is (x, y, z), and point of discharge is respectively d to the distance of ultrahigh frequency omnidirectional antenna 1 ~ 4 ₁, d ₂, d ₃and d ₄, list the system of equations about point of discharge coordinate (x, y, z) based on four initial times dt1, dt2, dt3 and dt4:

d ₂-d ₁＝vΔT ₂

d ₃-d ₁＝vΔT ₃

d ₄-d ₁＝vΔT ₄

Wherein, Δ T ₂=dt2-dt1, Δ T ₃=dt3-dt1, Δ T ₄=dt4-dt1; i=1,2,3,4; Propagation velocity of electromagnetic wave v=3.0 × 10 ⁸m/s;

(3) system of equations is solved, obtain the value of point of discharge coordinate (x, y, z), to position point of discharge; Specifically, successively grid data service is adopted to solve:

Write system of equations to be solved as vector form, wherein X=(x, y, z) ^t, then

$\stackrel{\→}{F}\left(X\right)=\left(\begin{array}{c}{d}_2-d_1-v\mathrm{\Δ}{T}_2\\ d_3-d_1-{\mathrm{v\ΔT}}_3\\ d_4-d_1-{\mathrm{v\ΔT}}_4\end{array}\right);$

First ground floor search is carried out:

At point of discharge coordinate (x, y, z) ∈ [x _min1, x _max1] × [y _min1, y _max1] × [z _min1, z _max1] interior with D ₁for IV interval minimum value, obtain the coordinate (x that this minimum value is corresponding _s1, y _s1, z _s1); (unit: m): x is got in the present embodiment _min1=-30, x _max1=30, y _min1=-30, y _max1=30, z _min1=-5, z _max1=20, D ₁=1;

Then second layer search is carried out:

At (x, y, z) ∈ [x _s1?D ₁, x _s1+ D ₁] × [y _s1?D ₁, y _s1+ D ₁] × [z _s1?D ₁, z _s1+ D ₁] interior with D ₂for IV interval minimum value, obtain the coordinate (x that this minimum value is corresponding _s2, y _s2, z _s2); (unit: m): D is got in the present embodiment ₂=0.06 (because of in practical application, use the high-speed oscilloscope that sampling rate is >5GS/s to carry out signals collecting, so minimum resolution is 6cm, for ease of calculating, minimum interval elects 6cm as);

In above-mentioned steps, (x, y, z) ∈ [x _min1, x _max1] × [y _min1, y _max1] × [z _min1, z _max1] be point of discharge coordinate affiliated area maximum magnitude, D ₂determine point of discharge coordinate setting precision, (x _s2, y _s2, z _s2) for finally solving the value of the point of discharge coordinate (x, y, z) obtained.

In actual applications, its function embodiment is that determine to carry out analysing in depth and locating after equipment or part of appliance have had defect pipelines risk, cost is low again, and efficiency is high by first roughly selecting defective equipment or part of appliance to the successively grid data service of such scheme.

The effect of the present embodiment system is verified below by laboratory test and on-the-spot test:

(1) laboratory test:

Fig. 4 illustrates the laboratory antenna array coordinate of the present embodiment system.

As shown in Figure 4, the coordinate of A, B, C, D tetra-points in the position corresponding diagram 4 of the ultrahigh frequency omnidirectional antenna 1 ~ 4 (bandwidth is 200M ~ 2GHz) in laboratory, simulation point of discharge coordinate (x, y, z) be (0.35,3.86,2.28) m, the high-speed oscilloscope pair signal corresponding with the superfrequency electromagnetic wave that simulation point of discharge sends that utilized bandwidth is 2GHz, sampling rate is 10GS/s gathers and is stored as four circuit-switched data; Portable computer reads this four circuit-switched data and is undertaken processing and analyzing by above-mentioned steps, and the assignment test result of the simulation point of discharge coordinate (x, y, z) obtained is as shown in table 1, wherein the corresponding one group of assignment test result of each row:

Table 1 assignment test result

x(m)	0.36	0.32	0.36	0.36	0.36	0.36
							y(m)	4.00	4.10	4.00	4.00	4.00	4.00
z(m)	2.40	2.52	2.46	2.40	2.40	2.40

In table 1, the mean place of six groups of assignment test results is (0.35,4.02,2.43) m, and the absolute error between the simulation point of discharge coordinate of reality is (0.00,0.16,0.15) m, consider that antenna radius, ground unrest, known location measure time difference calculating equal error producing cause, assignment test result meets accuracy requirement.

(2) on-the-spot test:

Fig. 5 illustrates the on-the-spot antenna array coordinate of the present embodiment system.

For the effect run under verification system at the scene strong interference environment, carry out the testing experiment of system in certain 500kV transformer station, as shown in Figure 5, on-the-spot ultrahigh frequency omnidirectional antenna 1 ~ 4 is arranged on automobile top support, by moving vehicle to (x, y, z) ∈ [x _min1, x _max1] × [y _min1, y _max1] × [z _min1, z _max1] cover simulation point of discharge coordinate (x, y, z) scope, the coordinate of A, B, C, D tetra-points in the position corresponding diagram 5 of now on-the-spot ultrahigh frequency omnidirectional antenna 1 ~ 4, simulation point of discharge coordinate (x, y, z) be (5.46,0.68,0.58) m, uses the high-speed oscilloscope pair signal corresponding with the superfrequency electromagnetic wave that simulation point of discharge sends gather and be stored as four circuit-switched data; Portable computer reads this four circuit-switched data and is undertaken processing and analyzing by above-mentioned steps, the simulation point of discharge coordinate (x obtained, y, z) assignment test result is (5.46,0.68,0.58) m, and the error between the simulation point of discharge coordinate of reality is within 2%, meets transformer station and entirely to stand the requirement of point of discharge positioning precision of shelf depreciation.

The transformer station partial discharge signals detection and positioning method of the present embodiment realizes based on the transformer station partial discharge signals detection and positioning system of above-mentioned the present embodiment, and its step is corresponding with the correlation step of the transformer station partial discharge signals detection and positioning system of above-mentioned the present embodiment, therefore repeats no more.

That enumerates it should be noted that above is only specific embodiments of the invention, obviously the invention is not restricted to above embodiment, has many similar changes thereupon.If all distortion that those skilled in the art directly derives from content disclosed by the invention or associates, protection scope of the present invention all should be belonged to.

Claims (9)

1. a transformer station partial discharge signals detection and positioning system, the superfrequency electromagnetic wave that the shelf depreciation produced for detecting substation equipment point of discharge excites, and described point of discharge is positioned, it is characterized in that, comprising:

Four ultrahigh frequency omnidirectional antennas receive amplification module, wherein each ultrahigh frequency omnidirectional antenna receives amplification module and includes ultrahigh frequency omnidirectional antenna and connected wideband pre-amplifier, wherein said ultrahigh frequency omnidirectional antenna receives the superfrequency electromagnetic wave that described shelf depreciation excites, and is amplified it by described wideband pre-amplifier and export four road signals after filtering;

There is the ultra-high-speed data acquisition unit of at least four tunnel inputs, the output that the input of its four tunnel and described four ultrahigh frequency omnidirectional antennas receive the wideband pre-amplifier of amplification module is connected respectively, to gather described four road signals respectively, and Jiang Gai tetra-road signal is converted to corresponding four circuit-switched data outputs;

Data processing and analytic unit, it is connected with described ultra-high-speed data acquisition unit, receives its four circuit-switched data exported and processes this four circuit-switched data and analyze, comprising step:

(1) described four circuit-switched data are processed and analyzed, obtain superfrequency electromagnetic wave that described shelf depreciation excites and arrive four moment that described four ultrahigh frequency omnidirectional antennas receive the ultrahigh frequency omnidirectional antenna of amplification module corresponding four initial times dt1, dt2, dt3 and dt4;

(2) three-dimensional coordinate system is set up, if the coordinate that described four ultrahigh frequency omnidirectional antennas receive the ultrahigh frequency omnidirectional antenna of amplification module is respectively known (x ₁, y ₁, z ₁), (x ₂, y ₂, z ₂), (x ₃, y ₃, z ₃) and (x ₄, y ₄, z ₄), point of discharge coordinate is (x, y, z), and the distance that point of discharge receives the ultrahigh frequency omnidirectional antenna of amplification module to described four ultrahigh frequency omnidirectional antennas is respectively d ₁, d ₂, d ₃and d ₄, list the system of equations about described point of discharge coordinate (x, y, z) based on described four initial times dt1, dt2, dt3 and dt4:

d ₂-d ₁＝vΔT ₂

d ₃-d ₁＝vΔT ₃

d ₄-d ₁＝vΔT ₄

Wherein, Δ T ₂=dt2-dt1, Δ T ₃=dt3-dt1, Δ T ₄=dt4-dt1; $d_i=\sqrt{{(x-x_i)}^2+{(y-y_i)}^2+{(z-z_i)}^2},i=1,2,3,4;$ Propagation velocity of electromagnetic wave v=3.0 × 10 ⁸m/s;

(3) described system of equations is solved, obtain the value of described point of discharge coordinate (x, y, z), to position described point of discharge.

2. transformer station partial discharge signals detection and positioning system as claimed in claim 1, it is characterized in that, in described step (1), described four initial times dt1, dt2, dt3 and dt4 are corresponding four the cumlative energy points of inflexion on a curve obtained by described four circuit-switched data respectively, and described cumlative energy curve is by formula obtain, wherein u _kfor the magnitude of voltage of the point of kth in the signal waveform that obtained by described data convert, j is counting of signal waveform record.

3. transformer station partial discharge signals detection and positioning system as claimed in claim 1 or 2, it is characterized in that, the method for solving of described step (3) adopts successively grid data service:

Write described system of equations as vector form, wherein X=(x, y, z) ^t, then

$\stackrel{\→}{F}\left(X\right)=\left(\begin{array}{c}{d}_2-d_1-v\mathrm{\Δ}{T}_2\\ d_3-d_1-{\mathrm{v\ΔT}}_3\\ d_4-d_1-{\mathrm{v\ΔT}}_4\end{array}\right);$

First ground floor search is carried out:

At point of discharge coordinate (x, y, z) ∈ [x _min1, x _max1] × [y _min1, y _max1] × [z _min1, z _max1] interior with D ₁for IV interval minimum value, obtain the coordinate (x that this minimum value is corresponding _s1, y _s1, z _s1);

Then second layer search is carried out:

At (x, y, z) ∈ [x _s1?D ₁, x _s1+ D ₁] × [y _s1?D ₁, y _s1+ D ₁] × [z _s1?D ₁, z _s1+ D ₁] interior with D ₂for IV interval minimum value, obtain the coordinate (x that this minimum value is corresponding _s2, y _s2, z _s2);

In above-mentioned steps, (x, y, z) ∈ [x _min1, x _max1] × [y _min1, y _max1] × [z _min1, z _max1] be point of discharge coordinate affiliated area maximum magnitude, D ₂determine point of discharge coordinate setting precision, (x _s2, y _s2, z _s2) for finally solving the value of the point of discharge coordinate (x, y, z) obtained.

4. transformer station partial discharge signals detection and positioning system as claimed in claim 1, is characterized in that, described four ultrahigh frequency omnidirectional antennas receive amplification module and are arranged on movable equipment.

5. transformer station partial discharge signals detection and positioning system as claimed in claim 1, it is characterized in that, described ultra-high-speed data acquisition unit is high-speed oscilloscope.

6. transformer station partial discharge signals detection and positioning system as claimed in claim 1, it is characterized in that, described data processing and analytic unit are computing machine.

7. a transformer station partial discharge signals detection and positioning method, the superfrequency electromagnetic wave that the shelf depreciation produced for detecting substation equipment point of discharge excites, and described point of discharge is positioned, it is characterized in that, comprise step:

(1) ultrahigh frequency omnidirectional antenna receiving amplification modules by four ultrahigh frequency omnidirectional antennas receives the superfrequency electromagnetic wave that described shelf depreciation excites, and is amplified it by the wideband pre-amplifier that four ultrahigh frequency omnidirectional antennas receive amplification modules and exported four road signals after filtering;

(2) the four tunnel inputs by having the ultra-high-speed data acquisition unit of at least four tunnel inputs gather described four road signals respectively, and Jiang Gai tetra-road signal is converted to corresponding four circuit-switched data outputs;

(3) by data processing and analytic unit, described four circuit-switched data are processed and are analyzed, comprise step:

(3a) described four circuit-switched data are processed and analyzed, obtain superfrequency electromagnetic wave that described shelf depreciation excites and arrive four moment that described four ultrahigh frequency omnidirectional antennas receive the ultrahigh frequency omnidirectional antenna of amplification module corresponding four initial times dt1, dt2, dt3 and dt4;

(3b) three-dimensional coordinate system is set up, if the coordinate that described four ultrahigh frequency omnidirectional antennas receive the ultrahigh frequency omnidirectional antenna of amplification module is respectively known (x ₁, y ₁, z ₁), (x ₂, y ₂, z ₂), (x ₃, y ₃, z ₃) and (x ₄, y ₄, z ₄), point of discharge coordinate is (x, y, z), and the distance that point of discharge receives the ultrahigh frequency omnidirectional antenna of amplification module to described four ultrahigh frequency omnidirectional antennas is respectively d ₁, d ₂, d ₃and d ₄, list the system of equations about described point of discharge coordinate (x, y, z) based on described four initial times dt1, dt2, dt3 and dt4:

d ₂-d ₁＝vΔT ₂

d ₃-d ₁＝vΔT ₃

d ₄-d ₁＝vΔT ₄

Wherein, Δ T ₂=dt2-dt1, Δ T ₃=dt3-dt1, Δ T ₄=dt4-dt1; $d_i=\sqrt{{(x-x_i)}^2+{(y-y_i)}^2+{(z-z_i)}^2},i=1,2,3,4;$ Propagation velocity of electromagnetic wave v=3.0 × 10 ⁸m/s;

(3c) described system of equations is solved, obtain the value of described point of discharge coordinate (x, y, z), to position described point of discharge.

8. transformer station partial discharge signals detection and positioning method as claimed in claim 7, it is characterized in that, in described step (3a), described four initial times dt1, dt2, dt3 and dt4 are corresponding four the cumlative energy points of inflexion on a curve obtained by described four circuit-switched data respectively, and described cumlative energy curve is by formula obtain, wherein u _kfor the magnitude of voltage of the point of kth in the signal waveform that obtained by described data convert, j is counting of signal waveform record.

9. transformer station partial discharge signals detection and positioning method as claimed in claim 7 or 8, it is characterized in that, the method for solving of described step (3c) adopts successively grid data service:

Write described system of equations as vector form, wherein X=(x, y, z) ^t, then

$\stackrel{\→}{F}\left(X\right)=\left(\begin{array}{c}{d}_2-d_1-v\mathrm{\Δ}{T}_2\\ d_3-d_1-{\mathrm{v\ΔT}}_3\\ d_4-d_1-{\mathrm{v\ΔT}}_4\end{array}\right);$

First ground floor search is carried out:

At point of discharge coordinate (x, y, z) ∈ [x _min1, x _max1] × [y _min1, y _max1] × [z _min1, z _max1] interior with D ₁for IV interval minimum value, obtain the coordinate (x that this minimum value is corresponding _s1, y _s1, z _s1);

Then second layer search is carried out:

At (x, y, z) ∈ [x _s1?D ₁, x _s1+ D ₁] × [y _s1?D ₁, y _s1+ D ₁] × [z _s1?D ₁, z _s1+ D ₁] interior with D ₂for IV interval minimum value, obtain the coordinate (x that this minimum value is corresponding _s2, y _s2, z _s2);

In above-mentioned steps, (x, y, z) ∈ [x _min1, x _max1] × [y _min1, y _max1] × [z _min1, z _max1] be point of discharge coordinate affiliated area maximum magnitude, D ₂determine point of discharge coordinate setting precision, (x _s2, y _s2, z _s2) for finally solving the value of the point of discharge coordinate (x, y, z) obtained.