CN102331542A - Transformer substation local discharging signal online monitoring and positioning method - Google Patents

Abstract

The invention discloses a transformer substation local discharging signal online monitoring and positioning method. Different from the traditional local discharging monitoring method which only can be used for monitoring one power equipment, the method provided by the invention is used for carrying out online monitoring and positioning on the local discharging signals of all the power equipment in a transformer substation. The method comprises the following steps of: (1) arranging an antenna array close to a central position in a space region of the transformer substation, and receiving an electromagnetic signal in the transformer substation by adopting the antenna array; (2) acquiring electromagnetic wave signals received by all antennae; (3) filtering the acquired electromagnetic wave signals, comparing the filtered electromagnetic wave signals with a standard local discharging signal; if the filtered electromagnetic wave signals are similar to or same with the standard local discharging signal, judging that a local discharging source exists in the substation; and (4) positioning the local discharging source by utilizing time difference of the local discharging signals received by two different antennae.

Description

Transformer station's local discharge signal on-line monitoring and localization method

Technical field

The present invention relates to monitoring of a kind of electric signal and localization method, relate in particular to a kind of method that the insulation fault of transformer station is monitored and located of being used for.

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 Insulated Switchgear 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 this invention is to provide a kind of transformer station local discharge signal on-line monitoring and localization method; This method is different from the existing partial discharge monitoring method that is used for the insulation fault judgement and can only monitors to a power equipment; It can realize monitoring for the whole power equipments in the whole transformer station; And to the power equipment realization location of shelf depreciation has taken place; Thereby be intended to save greatly equipment configuration cost and human cost, improve overhaul efficiency, reduce power off time as much as possible.

For realizing the foregoing invention purpose; The invention provides a kind of transformer station local discharge signal on-line monitoring and localization method; It is different from existing partial discharge monitoring method and can only monitors to a power equipment; But be used for the local discharge signal of the whole power equipments in the transformer station is carried out on-line monitoring and location, this method comprises the following steps:

(1) near the center in the area of space of transformer station an aerial array is set, adopts this aerial array to receive the electromagnetic wave signal in the transformer station, said aerial array comprises N antenna, N=1,2,3 ... M, n; M, n are natural number;

(2) gather the electromagnetic wave signal that each antenna receives;

After each electromagnetic wave signal that (3) will collect carries out filtering; Compare with a standard local discharge signal waveform; If it is close or identical with standard local discharge signal waveform through filtered electromagnetic wave signal; Then thinking has Partial Discharge Sources in this transformer station, and this Partial Discharge Sources is sent a local discharge signal;

(4) said Partial Discharge Sources is positioned:, obtain the mistiming T of the local discharge signal that two different antennas receive through comparing the waveform of each electromagnetic wave signal _Mn, to set up Partial Discharge Sources positioning equation group:

$\left\{\begin{array}{c}{\mathrm{cT}}_{12}=g_1-{\mathrm{<figure-callout\; id="2"\; label="g"\; filenames="110621115026.png"\; state="\{\{state\}\}">g</figure-callout>}}_2\\ {\mathrm{cT}}_{13}=g_1-{\mathrm{<figure-callout\; id="3"\; label="g"\; filenames="110621115026.png"\; state="\{\{state\}\}">g</figure-callout>}}_3\\ {\mathrm{cT}}_{14}=g_1-{\mathrm{<figure-callout\; id="4"\; label="g"\; filenames="110621115026.png"\; state="\{\{state\}\}">g</figure-callout>}}_4\\ ......\\ {\mathrm{cT}}_{\mathrm{mn}}=g_m-g_n\end{array}\right.$

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 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:

$\left\{\begin{array}{c}{X}_S=(X_{\mathrm{<figure-callout\; id="1"\; label="S"\; filenames="110621115026.png"\; state="\{\{state\}\}">S</figure-callout>}1}+{\mathrm{<figure-callout\; id="2"\; label="X\; S"\; filenames="110621115026.png"\; state="\{\{state\}\}">X</figure-callout>}}_S+{\mathrm{<figure-callout\; id="3"\; label="X\; S"\; filenames="110621115026.png"\; state="\{\{state\}\}">X</figure-callout>}}_S+...X_{\mathrm{Sn}})/n\\ Y_S=(Y_{S1}+Y_{S2}+Y_{S3}+...Y_{\mathrm{Sn}})/n\\ Z_S=({\mathrm{<figure-callout\; id="1"\; label="Z\; S"\; filenames="110621115026.png"\; state="\{\{state\}\}">Z</figure-callout>}}_S+{\mathrm{<figure-callout\; id="2"\; label="Z\; S"\; filenames="110621115026.png"\; state="\{\{state\}\}">Z</figure-callout>}}_S+{\mathrm{<figure-callout\; id="3"\; label="Z\; S"\; filenames="110621115026.png"\; state="\{\{state\}\}">Z</figure-callout>}}_S+...Z_{\mathrm{Sn}})/n\end{array}\right.$

The solution of above-mentioned equation belongs to known mathematical method, and the present technique scheme repeats no more at this.

In order to guarantee the accuracy of monitoring result, gather the electromagnetic wave signal that each antenna receives in the said step (2) after, the periodic jamming signals filtering that the monitoring band limits in each electromagnetic wave signal is outer.Said periodic jamming signals comprises electric system carrier communication and carrier current protection Communication Jamming signal, radio interference signal and satellite communication undesired signal.

Filtering in the said step (3) comprises filtering mobile phone undesired signal, and the pulse signal that short haul connection undesired signal, rectifier switch device closed are sent when cut-offfing does not have the randomness signal and the white noise of rule.

Each antenna in the said step (1) is a wideband omnidirectional antenna, and its frequency range is 0.2GHz-1.5GHz.

The present invention is owing to adopted above technical scheme; Make it can realize the whole power equipments in the transformer station are monitored; Can detect in this transformer station zone the power equipment shelf depreciation is arranged; And quickly and accurately Partial Discharge Sources is positioned, and then be convenient to this power equipment is overhauled rapidly, shortened power off time greatly.

Description of drawings

Come transformer station of the present invention local discharge signal on-line monitoring and localization method are further specified below in conjunction with accompanying drawing and specific embodiment.

Fig. 1 is the enforcement principle schematic of transformer station of the present invention local discharge signal on-line monitoring and localization method.

Fig. 2 has shown the electromagnetic wave signal oscillogram that each antenna receives.

Fig. 3 is transformer station of the present invention local discharge signal on-line monitoring and localization method process flow diagram in one embodiment.

Embodiment

As shown in Figure 1, suppose that the volume coordinate of Partial Discharge Sources is (X _S, Y _S, Z _S), each antenna in the aerial array also has volume coordinate separately, each antenna 1# in the aerial array; 2#; 3#, 4# ... M#, n# all can receive the signal that this Partial Discharge Sources is sent; Signal (as shown in Figure 2) that each antenna of high-speed data acquistion system collection receives back through each independently data transmission channel be transferred to data analysis and disposal system; Data analysis and disposal system in case find that local discharge signal is arranged, just position Partial Discharge Sources after these signals are carried out filtering etc. and handle at once.

As shown in Figure 3, in the present embodiment, adopt following step that transformer station's local discharge signal is carried out on-line monitoring and location:

(1) near the center in the area of space of transformer station an aerial array is set, adopts this aerial array to receive the electromagnetic wave signal in the transformer station, aerial array comprises N ultrahigh frequency broadband omnidirectional antenna antenna (frequency range is 0.2GHz-1.5GHz); N=1; 2,3 ... M, n; M, n are natural number (as shown in Figure 1);

(2) the HSDA unit (bandwidth 1GHz, sampling rate 3GSa/s) that has a plurality of passages is gathered the electromagnetic wave signal that each antenna receives;

(3) adopt low noise amplifier (frequency range 0.5GHz-1.5GHz; Gain 30dB) each electromagnetic wave signal of gathering is amplified; Adopt the filtering of BPF. (0.5GHz-1.5GHz) hardware to comprise electric system carrier communication and carrier current protection Communication Jamming signal then, radio interference signal and satellite communication undesired signal are in interior undesired signal;

(4) adopt digital filter system further to remove the mobile phone undesired signal in each electromagnetic wave signal, the pulse signal that short haul connection undesired signal, rectifier switch device closed are sent when cut-offfing does not have the randomness signal and the white noise of rule;

Each electromagnetic wave signal that (5) will pass through behind hardware filtering and the digital filtering is compared with standard local discharge signal waveform respectively: if close or identical with standard local discharge signal waveform through filtered electromagnetic wave signal; Then thinking has Partial Discharge Sources in this transformer station; This Partial Discharge Sources is sent a local discharge signal, carries out step (6); If bigger, then proceed monitoring with standard local discharge signal different wave shape;

(6) Partial Discharge Sources is positioned (simultaneously referring to Fig. 1):, obtain the mistiming T of the local discharge signal that two different antennas receive through comparing the waveform of each electromagnetic wave signal _Mn(T ₁₂, T ₁₃,

T ₁₂＝|T ₂-T ₁|

T ₁₃＝|T ₃-T ₁|

T ₁₄＝|T ₄-T ₁|

T ₂₃＝|T ₃-T ₂|

T ₂₄＝|T ₄-T ₂|

T ₃₄＝|T ₄-T ₃|

T _mn＝|T _m-T _n|

T ₁₄... T _MnRepresent respectively 1# antenna and 2# antenna, 1# antenna and 3# antenna, 1# antenna and 4# antenna ... M# antenna and n# antenna receive the mistiming of same local discharge signal):

Set up Partial Discharge Sources positioning equation group:

$\left\{\begin{array}{c}{\mathrm{cT}}_{12}=g_1-{\mathrm{<figure-callout\; id="2"\; label="g"\; filenames="110621115026.png"\; state="\{\{state\}\}">g</figure-callout>}}_2\\ {\mathrm{cT}}_{13}=g_1-{\mathrm{<figure-callout\; id="3"\; label="g"\; filenames="110621115026.png"\; state="\{\{state\}\}">g</figure-callout>}}_3\\ {\mathrm{cT}}_{14}=g_1-{\mathrm{<figure-callout\; id="4"\; label="g"\; filenames="110621115026.png"\; state="\{\{state\}\}">g</figure-callout>}}_4\\ ......\\ {\mathrm{cT}}_{\mathrm{mn}}=g_m-g_n\end{array}\right.$

In the formula, c is a propagation velocity of electromagnetic wave; g ₁, g ₂, g ₃, g ₄... g _m, g _nRepresent 1# antenna (X respectively ₁, Y ₁, Z ₁), 2# antenna (X ₂, Y ₂, Z ₂), 3# antenna (X ₃, Y ₃, Z ₃), 4# antenna (X ₄, Y ₄, Z ₄) ... M# antenna (X _m, Y _m, Z _m), n# antenna (X _S, Y _S, Z _S) to Partial Discharge Sources (X _S, Y _S, Z _S) distance, $g_n=\sqrt{{(X_S-X_n)}^2+{(Y_S-Y_n)}^2+{(Z_S-Z_n)}^2};$ 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;

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 (X of Partial Discharge Sources _S, Y _S, Z _S), group of equations is following:

$\left\{\begin{array}{c}{X}_S=({\mathrm{<figure-callout\; id="1"\; label="X\; S"\; filenames="110621115026.png"\; state="\{\{state\}\}">X</figure-callout>}}_S+{\mathrm{<figure-callout\; id="2"\; label="X\; S"\; filenames="110621115026.png"\; state="\{\{state\}\}">X</figure-callout>}}_S+{\mathrm{<figure-callout\; id="3"\; label="X\; S"\; filenames="110621115026.png"\; state="\{\{state\}\}">X</figure-callout>}}_S+...X_{\mathrm{Sn}})/n\\ Y_S=({\mathrm{<figure-callout\; id="1"\; label="Y\; S"\; filenames="110621115026.png"\; state="\{\{state\}\}">Y</figure-callout>}}_S+{\mathrm{<figure-callout\; id="2"\; label="Y\; S"\; filenames="110621115026.png"\; state="\{\{state\}\}">Y</figure-callout>}}_S+{\mathrm{<figure-callout\; id="3"\; label="Y\; S"\; filenames="110621115026.png"\; state="\{\{state\}\}">Y</figure-callout>}}_S+...Y_{\mathrm{Sn}})/n\\ Z_S=({\mathrm{<figure-callout\; id="1"\; label="Z\; S"\; filenames="110621115026.png"\; state="\{\{state\}\}">Z</figure-callout>}}_S+{\mathrm{<figure-callout\; id="2"\; label="Z\; S"\; filenames="110621115026.png"\; state="\{\{state\}\}">Z</figure-callout>}}_S+{\mathrm{<figure-callout\; id="3"\; label="Z\; S"\; filenames="110621115026.png"\; state="\{\{state\}\}">Z</figure-callout>}}_S+...Z_{\mathrm{Sn}})/n\end{array}\right.$

Confirmed the coordinate (X of Partial Discharge Sources _S, Y _S, Z _S) promptly accomplished location to Partial Discharge Sources.

Be noted that above enumerate be merely specific embodiment of the present invention, obviously the invention is not restricted to above embodiment, many similar variations are arranged thereupon.If those skilled in the art all should belong to protection scope of the present invention from all distortion that content disclosed by the invention directly derives or associates.

Claims (5)

1. transformer station's local discharge signal on-line monitoring and localization method, it is used for the local discharge signal of the whole power equipments in the transformer station is carried out on-line monitoring and location, it is characterized in that, comprises the following steps:

(1) near the center in the area of space of transformer station an aerial array is set, adopts this aerial array to receive the electromagnetic wave signal in the transformer station, said aerial array comprises N antenna, N=1,2,3 ... M, n;

(2) gather the electromagnetic wave signal that each antenna receives;

After each electromagnetic wave signal that (3) will collect carries out filtering; Compare with a standard local discharge signal waveform; If it is close or identical with standard local discharge signal waveform through filtered electromagnetic wave signal; Then thinking has Partial Discharge Sources in this transformer station, and this Partial Discharge Sources is sent a local discharge signal;

(4) Partial Discharge Sources is positioned:, obtain the mistiming T of the local discharge signal that two different antennas receive through comparing the waveform of each electromagnetic wave signal _MnTo set up Partial Discharge Sources positioning equation group, obtain the volume coordinate (X of Partial Discharge Sources _S, Y _S, Z _S):

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, (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.

2. transformer station as claimed in claim 1 local discharge signal on-line monitoring and localization method; It is characterized in that; Behind the electromagnetic wave signal that each antenna of collection receives in the said step (2), the periodic jamming signals filtering that the monitoring band limits in each electromagnetic wave signal is outer.

3. according to claim 1 or claim 2 transformer station's local discharge signal on-line monitoring and localization method; It is characterized in that; Filtering in the said step (3) comprises filtering mobile phone undesired signal; The pulse signal that short haul connection undesired signal, rectifier switch device closed are sent when cut-offfing does not have the randomness signal and the white noise of rule.

4. transformer station as claimed in claim 1 local discharge signal on-line monitoring and localization method is characterized in that, each antenna in the said step (1) is a wideband omnidirectional antenna, and its frequency range is 0.2GHz-1.5GHz.

5. transformer station as claimed in claim 2 local discharge signal on-line monitoring and localization method; It is characterized in that; Said periodic jamming signals comprises electric system carrier communication and carrier current protection Communication Jamming signal, radio interference signal and satellite communication undesired signal.

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