CN202141781U - Online monitoring and positioning device for transformer station partial discharge signals - Google Patents

Abstract

Disclosed is an online monitoring and positioning device for transformer station partial discharge signals, comprising: an antenna array which, arranged at or around the centre of the space area of the transformer station and consisting of a plurality of antennas, receives electromagnetic wave signals inside the transformer station, a data acquisition system which comprises a data acquisition unit having a plurality of channels, with the data acquisition unit being connected with the antennas mentioned above and correspondingly acquiring the electromagnetic wave signals received by the antennas, and a data process system which, with a plurality of channels, is connected with the data acquisition system via a plurality of data lines, with the data process system receiving the electromagnetic wave signals transmitted by all the data lines and displaying the received signals into digitalized waveforms.

Description

Transformer station's local discharge signal on-line monitoring and locating device

Technical field

The utility model relates to a kind of electric signal monitoring device, relates in particular to a kind of local discharge signal to transformer station and carries out device for monitoring.

Background technology

Insulation fault is one of major failure of being in operation of power equipment, before the power equipment generation insulation fault, a shelf depreciation process of development gradually generally all can be arranged, and finally cause insulation breakdown.If can carry out partial discharge monitoring and diagnosis to operational outfit in this process, in time find local discharge signal, in advance defective is handled, just can effectively avoid the generation of Fault of Insulating Breakdown.In addition,, also help to formulate and overhaul processing scheme more targetedly, reduce power off time, improve overhaul efficiency the location of partial discharge position.

Therefore, the lot of domestic and international researcher is all studied the partial discharge monitoring and the location of power equipment at present.Its main thought is single substation equipment; GIS (Gas InsulatedSwitchgear for example; Gas insulated combined electric appliance equipment), the shelf depreciation of equipment such as transformer, capacitive apparatus detects, and positions according to the acoustical signal and the electric signal that collect.Yet there are following defective in this monitoring and localization method:

1. partial discharges fault all may take place in any high voltage electric power equip ment in the transformer station; Want an electrical equipment at full station is implemented monitoring; Just the partial discharge monitoring device need be installed all on each equipment, this needs the time of labor, financial resources to carry out equipment purchase and installation;

2. the test philosophy of each monitoring system, pilot project, accuracy of detection etc. all are not quite similar, and the processing of great number tested data and analysis will directly influence the personnel's of transformer station work efficiency;

3. the maintenance and management of numerous monitoring devices also needs the time and the manpower of labor.

Summary of the invention

The purpose of the utility model provides a kind of transformer station local discharge signal on-line monitoring and locating device; It is different from the existing partial discharge monitoring device that is used for the insulation fault judgement and can only monitors to a power equipment; But can realize monitoring for the whole power equipments in the whole transformer station; And the Partial Discharge Sources of the local discharge signal that monitors accurately located; Thereby save equipment configuration cost and human cost greatly, improve overhaul efficiency, reduce power off time as much as possible.

In order to realize the foregoing invention purpose, the utility model provides a kind of transformer station local discharge signal on-line monitoring and locating device, and it comprises:

One aerial array, it is arranged near the center or center in transformer station's area of space, receives the electromagnetic wave signal in the transformer station, and said aerial array comprises several antennas;

One data acquisition system (DAS), it comprises that one has the data acquisition unit of several passages, said data acquisition unit is connected with said each antenna, the electromagnetic wave signal that corresponding each antenna of collection receives;

One data handling system; It has several passages; Said data handling system is connected with said data acquisition system (DAS) through some data lines, and said data handling system receives the electromagnetic wave signal of each data line transmission, and it is shown as digitized waveform respectively.

Adopt said apparatus to monitor the local discharge signal of whole power equipments of being provided with in the transformer station: each antenna in the aerial array can receive the electromagnetic wave signal in transformer station in real time; These electromagnetic wave signals transfer to data handling system after by the data acquisition system (DAS) collection and convert each DWF into; Local discharge signal waveform comparison with these DWF and standard; Just can judge in the electromagnetic wave signal of reception and whether contain local discharge signal; If promptly DWF is close with the local discharge signal waveform or identical, just can learn in this transformer station has power equipment that shelf depreciation has taken place.

A plurality of antennas the location that can realize Partial Discharge Sources is set, its implementation is following:

Through comparing the waveform of each electromagnetic wave signal, obtain the mistiming T of the same local discharge signal that two different antennas receive _Mn, to set up Partial Discharge Sources positioning equation group:

$\left\{\begin{array}{c}c{T}_{12}=g_1-g_2\\ c{T}_{13}=g_1-g_3\\ \mathrm{<figure-callout\; id="14"\; label="c\; T"\; filenames="110621111327.png"\; state="\{\{state\}\}">c</figure-callout>}{T}_{}{}_{14}=g_1-{\mathrm{<figure-callout\; id="4"\; label="g"\; filenames="110621104018.png"\; state="\{\{state\}\}">g</figure-callout>}}_4\\ ......\\ c{T}_{\mathrm{mn}}=g_m-g_n\end{array}\right.$

In the formula, c is a propagation velocity of electromagnetic wave; g ₁, g ₂, g ₃, g ₄... g _m, g _nRepresent first antenna respectively, second antenna, the 3rd antenna, the 4th antenna ... M antenna, n antenna arrives the distance of Partial Discharge Sources, $g_n=\sqrt{{(X_S-X_n)}^2+{(Y_S-Y_n)}^2+{(Z_S-Z_n)}^2},$ (X _n, Y _n, Z _n) be the volume coordinate of n antenna; T ₁₂, T ₁₃, T ₁₄... T _MnRepresent respectively first antenna and second antenna, first antenna and the 3rd antenna, first antenna and the 4th antenna ... M antenna and n antenna receive the mistiming of same local discharge signal.

Above-mentioned equations simultaneousness can obtain the volume coordinate (X of Partial Discharge Sources _S, Y _S, Z _S), promptly realize location to Partial Discharge Sources:

Adopt repeatedly simultaneous equations to find the solution coordinate, obtain some groups and separate (X _S1, Y _S1, Z _S1), (X _S2, Y _S2, Z _S2) ... (X _Sn, Y _Sn, Z _Sn), reject the coordinate figure that deviation strengthens, remaining coordinate figure is averaged, just obtain the coordinate of Partial Discharge Sources, group of equations is following:

$\left\{\begin{array}{c}{X}_S=(X_{S1}+{\mathrm{<figure-callout\; id="2"\; label="X\; S"\; filenames="110621104018.png"\; state="\{\{state\}\}">X</figure-callout>}}_S+{\mathrm{<figure-callout\; id="3"\; label="X\; S"\; filenames="110621104018.png"\; state="\{\{state\}\}">X</figure-callout>}}_S+...X_{\mathrm{Sn}})/n\\ Y_S=(Y_{S1}+Y_{S2}+Y_{S3}+...Y_{\mathrm{Sn}})/n\\ Z_S=(Z_{S1}+{\mathrm{<figure-callout\; id="2"\; label="Z\; S"\; filenames="110621104018.png"\; state="\{\{state\}\}">Z</figure-callout>}}_S+{\mathrm{<figure-callout\; id="3"\; label="Z\; S"\; filenames="110621104018.png"\; state="\{\{state\}\}">Z</figure-callout>}}_S+...Z_{\mathrm{Sn}})/n\end{array}\right.$

The solution of above-mentioned equation belongs to known mathematical method, and also belongs to the method for application of the described device of present technique scheme for the localization method of Partial Discharge Sources, so this paper just repeats no more at this.

Preferably, said data acquisition system (DAS) also comprises an amplifier, and it is connected with said data acquisition unit, and each electromagnetic wave signal that data acquisition unit is collected amplifies.

Preferably, said data acquisition system (DAS) also comprises a BPF., and it is connected with said amplifier, and elimination is through the periodic jamming signals in the electromagnetic wave signal that amplifies.

Preferably, said data handling system comprises:

One digital filtering module, it is connected with said each data line, the randomness undesired signal in the electromagnetic wave signal of each data line transmission of elimination;

One data processing module, it is connected with said digital filtering module, and each electromagnetic wave signal that will pass through digital filtering module filtering converts said digitized waveform into.

Preferably, said antenna is the ultrahigh frequency broadband omnidirectional antenna, and its frequency range is 0.2GHz-1.5GHz.

Alternatively, the bandwidth of said data acquisition unit is 1G-2GHz, and sampling rate is 2G-4GSa/s.

Alternatively, the frequency range of said amplifier is 0.5GHz-1.5GHz, gain 30dB.

Preferably, the frequency range of said BPF. is 0.5GHz-1.5GHz.

Preferably, said each bar data line has all wrapped a signal shielding layer outward, disturbs to prevent the signal in data transmission procedure.

The number of antenna is at least 4 in the said aerial array.

The described transformer station of the utility model local discharge signal on-line monitoring and locating device are owing to adopted technique scheme; Make it can realize the whole power equipments in the transformer station are monitored; And the Partial Discharge Sources of having sent local discharge signal realized location fast and accurately; Thereby improved overhaul efficiency, saved equipment configuration cost and human cost simultaneously.

Description of drawings

Come the described transformer station of the utility model local discharge signal on-line monitoring and locating device are further specified below in conjunction with accompanying drawing and specific embodiment.

Fig. 1 is the enforcement schematic diagram of the described transformer station of the utility model local discharge signal on-line monitoring and locating device.

Fig. 2 is the described transformer station of the utility model local discharge signal on-line monitoring and locating device structural representation in one embodiment.

Fig. 3 has shown the synoptic diagram through the DWF after the data handling system processing.

Embodiment

As shown in Figure 1; The present technique scheme through in transformer station's area of space, be provided with comprise a plurality of antennas aerial array (like 1#, 2# among the figure ... Deng) accept the local discharge signal that sends of Partial Discharge Sources P1, P2 (supposing to have Partial Discharge Sources in the transformer station space), and then the local discharge signal that sends through same Partial Discharge Sources positioned Partial Discharge Sources to the mistiming between the different antennas.

Transformer station's local discharge signal on-line monitoring and locating device in the present embodiment are as shown in Figure 2; It comprises the center that is arranged in transformer station's area of space or the aerial array of entad; This aerial array is divided into two row; Each row comprises 4 ultrahigh frequency broadband omnidirectional antennas (frequency range is 0.2GHz-1.5GHz), and these 8 ultrahigh frequency broadband omnidirectional antennas receive the electromagnetic wave signal in the transformer station.Data acquisition system (DAS) is arranged in the middle of two array antennas; Be connected with each ultrahigh frequency broadband omnidirectional antenna respectively; Electromagnetic wave signal to each ultrahigh frequency broadband omnidirectional antenna receives is gathered and pre-service, and the data acquisition system (DAS) in the present embodiment comprises a HSDA unit (bandwidth 1GHz, sampling rate is 3GSa/s) with several passages; (frequency range is 0.5GHz-1.5GHz to a low noise amplifier; 30dB gains) and a BPF. (frequency range is 0.5GHz-1.5GHz), wherein the electromagnetic wave signal that 8 ultrahigh frequency broadband omnidirectional antennas receive is gathered in the HSDA unit, and low noise amplifier amplifies these electromagnetic wave signals; BPF. is removed the PERIODIC INTERFERENCE in these electromagnetic wave signals; For example electric system carrier communication and carrier current protection Communication Jamming, radio interference, satellite communication interference etc.Data handling system in the present embodiment is arranged in the transformer station pulpit; This data handling system is connected with data acquisition system (DAS) through one group of data line; This group data line has 8 data lines that wrap the signal shielding layer respectively, and independent transmission is through data acquisition system (DAS) collection and pretreated each electromagnetic wave signal respectively.In order further to improve monitoring accuracy, the data handling system in the present embodiment comprises: a digital filtering module, and it is connected respectively with each data line; Be used for the randomness undesired signal of digital filtering with the elimination electromagnetic wave signal; Mobile phone undesired signal for example, short haul connection disturbs, the pulse signal that the rectifier switch device closed is sent when cut-offfing; Some do not have the randomness signal of rule, white noise etc.; One data processing module that is connected with digital filtering module, its each electromagnetic wave signal that will pass through digital filtering module filtering converts digitized waveform (as shown in Figure 3) into.Local discharge signal waveform comparison with these DWF and standard; Just can judge in the electromagnetic wave signal of reception and whether contain local discharge signal; If DWF is close with the local discharge signal waveform or identical, explaining in this transformer station has power equipment that shelf depreciation has taken place.

Through comparing the waveform of each electromagnetic wave signal, can obtain the same Partial Discharge Sources (X that two different antennas receive _S, Y _S, Z _S) the mistiming T of (as shown in Figure 2) signal _Mn, set up Partial Discharge Sources positioning equation group successively, just can realize location to Partial Discharge Sources.

For present embodiment, set up Partial Discharge Sources positioning equation group:

$\left\{\begin{array}{c}c{T}_{12}=g_1-g_2\\ c{T}_{13}=g_1-g_3\\ \mathrm{<figure-callout\; id="14"\; label="c\; T"\; filenames="110621111327.png"\; state="\{\{state\}\}">c</figure-callout>}{T}_{}{}_{14}=g_1-{\mathrm{<figure-callout\; id="4"\; label="g"\; filenames="110621104018.png"\; state="\{\{state\}\}">g</figure-callout>}}_4\\ ......\\ c{T}_{78}=g_7-{\mathrm{<figure-callout\; id="8"\; label="g"\; filenames="110621104018.png"\; state="\{\{state\}\}">g</figure-callout>}}_8\end{array}\right.$

In the formula, c is a propagation velocity of electromagnetic wave; g ₁, g ₂, g ₃, g ₄... g ₇, g ₈Represent the 1# antenna respectively, the 2# antenna, the 3# antenna, the 4# antenna ... The 7# antenna, the 8# antenna is to the distance of Partial Discharge Sources P; T ₁₂, T ₁₃, T ₁₄... T ₇₈Represent 1# antenna and 2# antenna respectively, 1# antenna and 3# antenna, 1# antenna and 4# antenna ... 7# antenna and 8# antenna receive the mistiming of the local discharge signal that Partial Discharge Sources P sends.

Above-mentioned equations simultaneousness can obtain the volume coordinate (X of Partial Discharge Sources P _S, Y _S, Z _S), promptly realize location to Partial Discharge Sources P.

Above-mentioned solving simultaneous equation obtains some groups and separates (X _S1, Y _S1, Z _S1), (X _S2, Y _S2, Z _S2) ... (X _S8, Y _S8, Z _S8), reject the coordinate figure that deviation strengthens, remaining coordinate figure is averaged, just obtain the coordinate of Partial Discharge Sources P, group of equations is following:

$\left\{\begin{array}{c}{X}_S=(X_{S1}+{\mathrm{<figure-callout\; id="2"\; label="X\; S"\; filenames="110621104018.png"\; state="\{\{state\}\}">X</figure-callout>}}_S+{\mathrm{<figure-callout\; id="3"\; label="X\; S"\; filenames="110621104018.png"\; state="\{\{state\}\}">X</figure-callout>}}_S+...X_{S8})/8\\ Y_S=(Y_{S1}+{\mathrm{<figure-callout\; id="2"\; label="Y\; S"\; filenames="110621104018.png"\; state="\{\{state\}\}">Y</figure-callout>}}_S+{\mathrm{<figure-callout\; id="3"\; label="Y\; S"\; filenames="110621104018.png"\; state="\{\{state\}\}">Y</figure-callout>}}_S+...Y_{S8})/8\\ Z_S=(Z_{S1}+{\mathrm{<figure-callout\; id="2"\; label="Z\; S"\; filenames="110621104018.png"\; state="\{\{state\}\}">Z</figure-callout>}}_S+{\mathrm{<figure-callout\; id="3"\; label="Z\; S"\; filenames="110621104018.png"\; state="\{\{state\}\}">Z</figure-callout>}}_S+...Z_{S8})/8\end{array}\right.$

Be noted that the above specific embodiment of enumerating that is merely the utility model, obviously the utility model is not limited to above embodiment, and many similar variations are arranged thereupon.If those skilled in the art from all distortion that the disclosed content of the utility model directly derives or associates, all should belong to the protection domain of the utility model.

Claims (10)

1. transformer station's local discharge signal on-line monitoring and locating device is characterized in that, comprising:

One aerial array, it is arranged near the center or center in transformer station's area of space, receives the electromagnetic wave signal in the transformer station, and said aerial array comprises several antennas;

One data acquisition system (DAS), it comprises that one has the data acquisition unit of several passages, said data acquisition unit is connected with said each antenna, the electromagnetic wave signal that corresponding each antenna of collection receives;

One data handling system; It has several passages; Said data handling system is connected with said data acquisition system (DAS) through some data lines, and said data handling system receives the electromagnetic wave signal of each data line transmission, and it is shown as digitized waveform respectively.

2. transformer station as claimed in claim 1 local discharge signal on-line monitoring and locating device; It is characterized in that; Said data acquisition system (DAS) also comprises an amplifier, and it is connected with said data acquisition unit, and each electromagnetic wave signal that data acquisition unit is collected amplifies.

3. transformer station as claimed in claim 2 local discharge signal on-line monitoring and locating device; It is characterized in that; Said data acquisition system (DAS) also comprises a BPF., and it is connected with said amplifier, and elimination is through the periodic jamming signals in the electromagnetic wave signal that amplifies.

4. like any described transformer station local discharge signal on-line monitoring and locating device among the claim 1-3, it is characterized in that said data handling system comprises:

One digital filtering module, it is connected with said each data line, the randomness undesired signal in the electromagnetic wave signal of each data line transmission of elimination;

One data processing module, it is connected with said digital filtering module, and each electromagnetic wave signal that will pass through digital filtering module filtering converts said digitized waveform into.

5. transformer station as claimed in claim 1 local discharge signal on-line monitoring and locating device is characterized in that, said antenna is the ultrahigh frequency broadband omnidirectional antenna, and its frequency range is 0.2GHz-1.5GHz.

6. like claim 1 or 5 described transformer station local discharge signal on-Line Monitor Device, it is characterized in that the bandwidth of said data acquisition unit is 1G-2GHz, sampling rate is 2G-4GSa/s.

7. transformer station as claimed in claim 2 local discharge signal on-line monitoring and locating device is characterized in that, the frequency range of said amplifier is 0.5GHz-1.5GHz, gain 30dB.

8. transformer station as claimed in claim 3 local discharge signal on-line monitoring and locating device is characterized in that, the frequency range of said BPF. is 0.5GHz-1.5GHz.

9. transformer station as claimed in claim 1 local discharge signal on-line monitoring and locating device is characterized in that, said each bar data line has all wrapped a signal shielding layer outward.

10. transformer station as claimed in claim 1 local discharge signal on-line monitoring and locating device is characterized in that, the number of antenna is at least 4 in the said aerial array.

Images