CN104808106A - Electrical equipment local discharge positioning method and system - Google Patents

Abstract

The invention relates to an electrical equipment local discharge positioning method and system. The method comprises the following steps of selecting one of a plurality of wireless sensors as a master clock and the other wireless sensors as slave clocks, and synchronizing the time of the master clock and the slave clocks; controlling the master clock to transmit a synchronous measurement instruction, and enabling the slave clocks to synchronously collecting ultrasonic signals generated in an electrical equipment measuring position at the same time with the master clock after receiving the synchronous measurement instruction; obtaining the head wave time of the ultrasonic signals in a wireless mode, which is recorded by a local discharge pulse time extracting module in every wireless sensor, selecting the shortest four head wave times, and according to the four head wave times and the positions of the corresponding wireless sensors determining the local discharge position of electrical equipment. By achieving ultrasonic collection and positioning through the wireless sensors, the electrical equipment local discharge positioning method is low in workload and high in safety.

Description

Power equipment partial discharge positioning method and system

Technical field

The present invention relates to shelf depreciation field of locating technology, particularly relate to a kind of power equipment partial discharge positioning method and system.

Background technology

Power equipment before because of insulation defect generation insulation breakdown, can produce shelf depreciation (putting hereinafter referred to as office).It is sign and the form of expression of Electric Power Equipment Insulation defect that office puts.Put row into power equipment office to detect, more early can find the insulation defect of its inside, to take appropriate measures, prevent it from further developing and cause the accident.

Power equipment is in defect emergence and development process, its deterioration state can be characterized and reflection by sound, the multiclass Physics eigenvector such as optical, electrical, hot, and power equipment detection method for local discharge conventional at present comprises the detection and location that the methods such as ultrasound examination, measurement of electric parameter and superfrequency electromagnetic wave can realize Partial Discharge Sources.The applicable elements of different sensors and detection method is subject to a definite limitation due to detecting physical quantities inherent characteristic, such as sonac detection office puts because ultrasonic propagation velocity is low, utilize digital method to carry out shelf depreciation location and can obtain higher positioning precision, be applicable to accurately locate among a small circle in tens centimetres.

But, what existing ultrasonic method Partial Discharge Detection was positioned at that Signal transmissions aspect mostly adopts is this wired connected mode of signal cable or optical fiber, this mode is unfavorable for the change (expansion or reduction) of system architecture, add the workload of on-the-spot test, and there are secure context misgivings.

Summary of the invention

Based on this, be necessary to provide a kind of lower workload and there is power equipment partial discharge positioning method and the system of higher-security.

A kind of power equipment partial discharge positioning method, comprises the following steps:

From some wireless sensers, select one as major clock, all the other wireless sensers as from clock, and to described major clock with carry out time synchronized from clock; Wherein, described wireless senser is distributed in the surrounding of power equipment measuring position, comprises the signal coupler, Signal-regulated kinase, the office that connect successively and puts burst length extraction module and wireless communication module;

Control described major clock and send synchro measure order to from clock, the described ultrasonic signal put synchronous acquisition power equipment measuring position at the same time and produce from clock with described major clock after receiving described synchro measure order;

The Mintrop wave moment that the ultrasonic signal of burst length extraction module record is put in office in each wireless senser is obtained by wireless form, and choose four Mintrop wave moment minimum in the described Mintrop wave moment, the position of power equipment shelf depreciation is determined according to the position of the wireless senser of four Mintrop wave moment and correspondence.

A kind of power equipment shelf depreciation positioning system, comprising:

Synchronization module, for selecting one as major clock from some wireless sensers, all the other wireless sensers as from clock, and to described major clock with carry out time synchronized from clock; Wherein, described wireless senser is distributed in the surrounding of power equipment measuring position, comprises the signal coupler, Signal-regulated kinase, the office that connect successively and puts burst length extraction module and wireless communication module;

Measurement module, sends synchro measure order for controlling described major clock to from clock, the described ultrasonic signal put synchronous acquisition power equipment measuring position at the same time and produce from clock with described major clock after receiving described synchro measure order;

Locating module, for being obtained the Mintrop wave moment that the ultrasonic signal of burst length extraction module record is put in office in each wireless senser by wireless form, and choose four Mintrop wave moment minimum in the described Mintrop wave moment, the position of power equipment shelf depreciation is determined according to the position of the wireless senser of four Mintrop wave moment and correspondence.

Above-mentioned power equipment partial discharge positioning method and system, by the wireless senser being deployed in power equipment measuring position surrounding is carried out time synchronized, thus improve the degree of accuracy measured, then control major clock and send synchro measure order to from clock, the ultrasonic signal that synchronous acquisition power equipment measuring position produces, following acquisition office is put four Mintrop wave moment minimum in the Mintrop wave moment of the ultrasonic signal of burst length extraction module record and is determined the position of power equipment shelf depreciation by the position of the wireless senser of four Mintrop wave moment and correspondence, due to employing is that wireless senser is to carry out ultrasound acquisition and location, wireless form is adopted in Signal transmissions, also more flexible in installation and unloading, simultaneously, there is less workload and higher security.

Accompanying drawing explanation

Fig. 1 is an embodiment power equipment partial discharge positioning method process flow diagram;

Fig. 2 is an embodiment wireless senser structural representation;

Fig. 3 is an embodiment wireless senser location partial discharge position schematic diagram;

Fig. 4 be an embodiment major clock with from synchronizing clock time schematic diagram;

Fig. 5 is an embodiment power equipment shelf depreciation positioning system structure schematic diagram.

Embodiment

Be described in detail below in conjunction with the embodiment of accompanying drawing to power equipment partial discharge positioning method of the present invention and system.

Refer to Fig. 1, Fig. 1 is an embodiment power equipment partial discharge positioning method process flow diagram.

A kind of power equipment partial discharge positioning method, comprises the following steps:

Step S101: select one as major clock from some wireless sensers, all the other wireless sensers as from clock, and to described major clock with carry out time synchronized from clock; Wherein, described wireless senser is distributed in the surrounding of power equipment measuring position, comprises the signal coupler, Signal-regulated kinase, the office that connect successively and puts burst length extraction module and wireless communication module;

In step S101, to described major clock with to carry out time synchronized from clock be to ensure that all wireless sensers are when gathering the ultrasonic signal that power equipment measuring position produces, clock between each wireless senser keeps higher degree of accuracy, thus improves the degree of accuracy measured.

In one embodiment, describedly can to comprise described major clock and the step of carrying out time synchronized from clock:

Control described major clock to from clock transmitting time synch command, wherein, described time synchronized order comprises the moment of transmitting time synch command, i.e. the first moment;

Receive the moment of described time synchronized order as the second moment from clock log, and send synch command return information in the 3rd moment to described major clock; Described major clock record receives the moment of synch command return information as the 4th moment, and is sent to from clock by described 4th moment;

According to described first moment, the second moment, the 3rd moment and the 4th moment calculate described major clock with from the communication delay of clock and clock offset times; The time from clock is calibrated according to described communication delay and clock offset times.

Major clock transmitting time synch command can be sent by the form of SYNC message, period, utilizes Follow_up information frame to be sent to from clock by the first moment simultaneously; Sending synch command return information from clock can by the form of Delay_Req message, and described 4th moment is sent to by major clock can by the form of Delay_Resp message from clock.

Further, in one embodiment, described according to described first moment, the second moment, the 3rd moment and the 4th moment calculate described major clock with can comprise from the communication delay of clock and the step of clock offset times:

The first relational expression of communication delay and clock offset times is calculated according to described first moment and the second moment;

The second relational expression of communication delay and clock offset times is calculated according to described 3rd moment and the 4th moment;

According to described first relational expression and the second relational expression calculate described major clock with from the communication delay of clock and clock offset times.

In one embodiment, described first relational expression is:

T _offset＝T ₂-T ₁-T _Delay，

Wherein, T ₁represented for the first moment, T ₂represented for the second moment, T _offsetrepresent clock offset times, T _delayrepresent communication delay;

Described second relational expression is:

T _Delay＝T ₄-T ₃+T _offset，

Wherein, T ₃represented for the 3rd moment, T ₄represented for the 4th moment.

In one embodiment, described according to described first relational expression and the second relational expression calculate described major clock with from the communication delay of clock and the step of clock offset times, calculate described major clock with from the communication delay of clock and the formula of clock offset times be:

$T_{\mathrm{offset}}=\frac{(T_2-T_1)-(T_4-T_3)}{2},$

Wherein, T ₁represented for the first moment, T ₂represented for the second moment, T ₃represented for the 3rd moment, T ₄represented for the 4th moment, T _offsetrepresent clock offset times;

wherein, T _delayrepresent communication delay.

Step S103: control described major clock and send synchro measure order to from clock, the described ultrasonic signal put synchronous acquisition power equipment measuring position at the same time and produce from clock with described major clock after receiving described synchro measure order;

In step s 103, the general position that shelf depreciation occurs can produce ultrasonic signal, and making major clock and gather from clock the ultrasonic signal that same position produces simultaneously can better for the position of follow-up location shelf depreciation provides foundation.

Step S105: obtain the Mintrop wave moment that the ultrasonic signal of burst length extraction module record is put in office in each wireless senser by wireless form, and choose four Mintrop wave moment minimum in the described Mintrop wave moment, the position of power equipment shelf depreciation is determined according to the position of the wireless senser of four Mintrop wave moment and correspondence.

In step S105, choosing four Mintrop wave moment minimum in the Mintrop wave moment is that to represent wireless senser nearest from source of ultrasound signal due to the minimum Mintrop wave moment, the ultrasonic signal obtained is also larger, adopt the reason of four to be want the place position that one, location is arranged in three dimensions, need to calculate in conjunction with the position of four reference point and the measuring position distance to reference point.

In one embodiment, the position of the described wireless senser according to four Mintrop wave moment and correspondence determines that the step of the position of power equipment shelf depreciation can comprise:

Select a conduct reference moment in four Mintrop wave moment, calculate all the other Mintrop wave moment and the mistiming with reference to the moment;

Obtain the volume coordinate of wireless senser position corresponding to four Mintrop wave moment; The volume coordinate of the position of shelf depreciation is obtained, according to the position of the volume coordinate determination power equipment shelf depreciation of the position of shelf depreciation according to described mistiming and spatial coordinates calculation.

In one embodiment, describedly obtain in the step of the volume coordinate of the position of shelf depreciation according to described mistiming and spatial coordinates calculation, the formula calculating the volume coordinate of the position of shelf depreciation is:

$\begin{array}{c}{t}_{12}=[\sqrt{{\left({x-x}_2\right)}^2+{\left({y-y}_2\right)}^2+{\left({z-z}_2\right)}^2}-\sqrt{{\left({x-x}_1\right)}^2+{\left({y-y}_1\right)}^2+{\left({z-z}_1\right)}^2}]/v\\ t_{13}=[\sqrt{{\left({x-x}_3\right)}^2+{\left({y-y}_3\right)}^2+{\left({z-z}_3\right)}^2}-\sqrt{{\left({x-x}_1\right)}^2+{\left({y-y}_1\right)}^2+{\left({z-z}_1\right)}^2}]/v\\ t_{14}=[\sqrt{{\left({x-x}_4\right)}^2+{\left({y-y}_4\right)}^2+{\left({z-z}_4\right)}^2}-\sqrt{{\left({x-x}_1\right)}^2+{\left({y-y}_1\right)}^2+{\left({z-z}_1\right)}^2}]/v\end{array},$

Wherein, x, y, z represents the volume coordinate of the position of shelf depreciation, x ₁, y ₁, z ₁represent the volume coordinate with reference to wireless senser position corresponding to moment, x ₂, y ₂, z ₂represent the volume coordinate of the wireless senser position that first Mintrop wave moment in its excess-three Mintrop wave moment is corresponding, x ₃, y ₃, z ₃represent the volume coordinate of the wireless senser position that second Mintrop wave moment in its excess-three Mintrop wave moment is corresponding, x ₄, y ₄, z ₄represent the volume coordinate of the wireless senser position that the 3rd the Mintrop wave moment in its excess-three Mintrop wave moment is corresponding, t ₁₂represent first Mintrop wave moment in its excess-three Mintrop wave moment and the mistiming with reference to the moment, t ₁₃represent second Mintrop wave moment in its excess-three Mintrop wave moment and the mistiming with reference to the moment, t ₁₄represent the 3rd the Mintrop wave moment in its excess-three Mintrop wave moment and the mistiming with reference to the moment, v represents ultrasonic velocity.

In one embodiment, described wireless senser can comprise: burst length extraction module and wireless communication module are put in the signal coupler connected successively, Signal-regulated kinase, office;

Described signal coupler, for the reception ultrasonic signal that is coupled, and is sent to described Signal-regulated kinase by described ultrasonic signal;

Described Signal-regulated kinase, for carrying out filtering to the described ultrasonic signal received and amplifying process, and is sent to described office by treated ultrasonic signal and puts burst length extraction module;

Burst length extraction module is put in described office, for recording the initial time of treated ultrasonic signal Mintrop wave;

Described wireless communication module, for carrying out radio communication and wireless synchronization between other wireless sensers.

Above-mentioned power equipment partial discharge positioning method, by the wireless senser being deployed in power equipment measuring position surrounding is carried out time synchronized, thus improve the degree of accuracy measured, then control major clock and send synchro measure order to from clock, the ultrasonic signal that synchronous acquisition power equipment measuring position produces, following acquisition office is put four Mintrop wave moment minimum in the Mintrop wave moment of the ultrasonic signal of burst length extraction module record and is determined the position of power equipment shelf depreciation by the position of the wireless senser of four Mintrop wave moment and correspondence, due to employing is that wireless senser is to carry out ultrasound acquisition and location, wireless form is adopted in Signal transmissions, there is less workload and higher security.And, the present invention intends adopting the method for wireless communication network and synchro measure to realize the detection and location of type local-discharge ultrasonic signal, by wireless network transmissions information between the wireless sensor node of collection ultrasonic signal, and realize the synchronous acquisition of multiple sampled point, synchronization accuracy, within 5us, utilizes the time of reception of multiple ultrasonic signal coupling mechanism difference to realize the location of shelf depreciation.Compared with the existing partial discharge detecting system based on wired mode, the quantity flexibility and changeability of the wireless senser adopted when the present invention measures, installation and dismounting, mobile in there is the incomparable dirigibility of existing system, and without the need to wiring, use safer.

In order to more detailed description power equipment partial discharge positioning method of the present invention, be described below in conjunction with embody rule example.

Sensor (i.e. wireless senser) node composition structure is put as shown in Figure 2 in wireless office, and wireless office puts sensor node and puts burst length extraction module, power module and wireless communication module by signal coupler, Signal-regulated kinase, office.The coupling that signal coupler realizes ultrasonic signal receives; Signal-regulated kinase comprises the unit such as filtering, amplification of ultrasonic signal; Office puts burst length extraction module and mainly carries out record to shelf depreciation ultrasonic signal wave head (i.e. ultrasonic signal Mintrop wave) initial time; Wireless communication module is for realizing radio communication between wireless senser and wireless synchronization.Because ultrasonic signal coupling mechanism, filtering, amplifying unit and signals collecting etc. have introduction at present on a lot of document, here repeat no more.

It is easy for installation that sensor is put in wireless office, and each sensor gets final product independent operating, also can form self-organizing radio sensor network and realize multi-channel detection.The wireless senser that equipment for different scales only need configure varying number can realize the covering completely of multiple interval or equipment, realizes by wireless synchronization the synchronous detection that sensor is put in owning administration, and system architecture is flexible, and extendability is extremely strong.

This embody rule example utilizes multiple wireless ultrasound sensor synchronously to detect the location realizing Partial Discharge Sources, simultaneously cardinal principle measures the mistiming that they receive the signal of same discharge source, realizes discharge signal accurately locate based on the analysis of discharge signal time-delay series and spatial analysis.Its principle schematic as shown in Figure 2.Basic skills based on many group signal time-of-arrival loactions is time delay or the mistiming that the ultrasonic signal produced by also measure local electric discharge propagates into the sensor of multiple diverse location, according to signal time delay and ultrasonic propagation velocity, utilize the method for interspace analytic geometry to calculate the position of Partial Discharge Sources, realize insulation defect location.Because ultrasound wave is decayed comparatively large in power equipment common used material medium, it is less that it measures effective range, but can realize the accurate location of insulation defect.

As shown in Figure 3, adopt time-of-arrival loaction to arrive time delay by the signal that the multiple sonac of process receives to position discharge source.Planar, the mistiming that discharge signal arrives two different sensors defines the hyperbolic curve that a pair is focus with this two sensors, if use multiple sensor, many curves will be formed, ideally, these curves can give same point mutually, and this point is Partial Discharge Sources.In two dimensional surface, utilize three sensors can form two pairs of hyperbolic curves to produce intersection point, then get rid of False Intersection Points by direction finding message, just can determine target location.To determine the target in space, because target degree of freedom is three, then at least need the position of four sensor determination targets.

Obtain ultrasonic signal to Mintrop wave moment of each sensor, and choose four Mintrop wave moment minimum in the described Mintrop wave moment, determine the position of power equipment shelf depreciation according to the position of the sensor of four Mintrop wave moment and correspondence.The local discharge signal S that i-th sensor measurement arrives _i(suppose with first sensor S with reference sensor ₁for reference sensor) the local discharge signal S that measures _ibetween relative signal time delay be t _1i=t _i-t ₁(i=2,3,4) are signal and arrive time delay.Calculated by following Nonlinear System of Equations:

$\begin{array}{c}{t}_{12}=[\sqrt{{\left({x-x}_2\right)}^2+{\left({y-y}_2\right)}^2+{\left({z-z}_2\right)}^2}-\sqrt{{\left({x-x}_1\right)}^2+{\left({y-y}_1\right)}^2+{\left({z-z}_1\right)}^2}]/v\\ t_{13}=[\sqrt{{\left({x-x}_3\right)}^2+{\left({y-y}_3\right)}^2+{\left({z-z}_3\right)}^2}-\sqrt{{\left({x-x}_1\right)}^2+{\left({y-y}_1\right)}^2+{\left({z-z}_1\right)}^2}]/v\\ t_{14}=[\sqrt{{\left({x-x}_4\right)}^2+{\left({y-y}_4\right)}^2+{\left({z-z}_4\right)}^2}-\sqrt{{\left({x-x}_1\right)}^2+{\left({y-y}_1\right)}^2+{\left({z-z}_1\right)}^2}]/v\end{array}---\left(1\right)$

Wherein, x, y, z represents the volume coordinate of the position of shelf depreciation, x ₁, y ₁, z ₁represent the volume coordinate with reference to sensing station corresponding to moment, x ₂, y ₂, z ₂represent the volume coordinate of the sensing station that first Mintrop wave moment in its excess-three Mintrop wave moment is corresponding, x ₃, y ₃, z ₃represent the volume coordinate of the sensing station that second Mintrop wave moment in its excess-three Mintrop wave moment is corresponding, x ₄, y ₄, z ₄represent the volume coordinate of the 3rd sensing station that the Mintrop wave moment is corresponding in its excess-three Mintrop wave moment, t ₁₂represent first Mintrop wave moment in its excess-three Mintrop wave moment and the mistiming with reference to the moment, t ₁₃represent second Mintrop wave moment in its excess-three Mintrop wave moment and the mistiming with reference to the moment, t ₁₄represent the 3rd the Mintrop wave moment in its excess-three Mintrop wave moment and the mistiming with reference to the moment, v represents ultrasonic velocity.

Bring in above-mentioned system of equations by record three relative signal time delays and each sensor accurate location, then solving equations can obtain the locus of discharge source.

According to above-mentioned Partial Discharge Detection positioning principle, the key affecting positioning precision is the synchro measure how realizing signal between sensor.Existing measuring equipment realizes synchronous main method to be had based on the time synchronized of GPS (GlobalPositioning System, GPS) and the time synchronized based on Ethernet.The more widely used GPS of being realizes time synchronized, and its PPS (Pulse Per Second, pulse per second (PPS)) clock accuracy can reach 200ns, can meet the needs of the synchronous observing and controlling of electric system.But GPS synchronously needs to complete in outdoor, search star at the scene more difficult, also likely because weather, fault and other factors cause PPS pulse to lose efficacy, and need independently antenna and receiver module, cost is higher, is difficult to large-scale application in scene simultaneously.Method for synchronizing time based on Ethernet is widely applied in the electric system of local, as the time synchronized of substation level and the time synchronized etc. of Ship Electrical Power System, the method utilizes network time synchronization agreement, as NTP (Network Time Protocol, NTP (Network Time Protocol))/SNTP (Simple Network Time Protocol, simple network agreement) and IEEE1588 agreement etc., each child node in the electric system of calibration local, make the time synchronized of itself and time synchronized server, thus reach the object of synchro measure, its time precision can reach submicrosecond level, synchro measure needs can be met.But this method generally needs Ethernet cable connects each node, and needs establishing time synchronization server in system.The synchronous method of current time also has BPL (the Broadband over power lines by national time service center, broadband over power line) long wave time service system high precision clock that is synchronous and that designed by CPLD (Complex Programmable Logic Device, CPLD) is synchronous etc.

The wireless synchronization method that this embody rule example proposes directly realizes synchro measure by the mode of radio communication.Directly communication delay is processed in the method, be algorithmically easy to realize, and can not hardware cost be increased.

As shown in Figure 4, each sensor node clock, adopt message synchronous, whole detection system has a sensor as major clock, and all the other are all from clock, defines four kinds of messages, is SYNC, Follow_up, Delay_Req and Delay_Resp respectively.Synchronously be divided into two stages: offset measurement stage and delay measurements stage.As shown in Figure 2.

In the offset measurement stage: major clock is periodic transmission SYNC message generally, generally within every 2 seconds, once the precise time t that SYNC sends measured by major clock ₁, and send to from clock at Follow_up information frame subsequently, the precise time t of SYNC is received from clock measurement ₂, like this, the time that truly sends of SYNC and true time of reception can be obtained when receiving Follow_up information frame from clock, and obtain expression formula:

T _offset＝T ₂-T ₁-T _Delay(2)

The delay measurements stage: after receiving SYNC information from clock, at t ₃moment sends latency request packets of information Delay_req to major clock, and major clock record receives the correct time t of Delay_req ₄, concurrent losing one's life makes Delay_resp by t ₄inform from clock.Now will know four timestamps from clock, and can following formula be obtained:

T _Delay＝T ₄-T ₃+T _offset(3)

And comprehensive (2), (3) formula can draw,

$T_{\mathrm{offset}}=\frac{(T_2-T_1)-(T_4-T_3)}{2}---\left(4\right)$

Wherein, T ₁represent t ₁, T ₂represent t ₂, T ₃represent t ₃, T ₄represent t ₄, T _offsetrepresent clock offset times;

$T_{\mathrm{Delay}}=\frac{(T_4-T_3)+(T_2-T_1)}{2}---\left(5\right)$

Wherein, T _delayrepresent communication delay,

Can find out by analyzing above computation process, clock skew can be calculated, communication delay line time of going forward side by side is synchronously based on an important hypothesis: anterior-posterior approach is symmetrical, namely message from major clock send to from clock with from sending to the communication delay of major clock identical from clock.As long as long as so in theory communication system meet this condition can to carry out the deadline with this algorithm synchronous.

Multiple wireless senser synchro measure local discharge signal realizes the performing step of discharge source location:

Analyzed by method for synchronizing time and local breakdown location actual needs, the main performing step of this embody rule example comprises:

The first step, measure start time, as the wireless senser 1 of major clock to other wireless senser transmitting time synch command (sync), in time synchronized order, comprise correct time t when wireless senser 1 sends sync ₁, other wireless sensers record the correct time t received when receiving sync ₂, other wireless sensers after receiving sync information, at t ₃moment sends synch command return information bag (Delay_req), and wireless senser 1 receives Delay_req order, records the time of reception t of other wireless sensers accurately ₄, therefore obtain as expression formula (2) above, (3)

Second step, according to formula (4), (5), wireless senser 1 just can calculate communication delay T _delay-nand the time deviation T between other wireless sensers and wireless senser 1 _offset-nbecause communication delay is random series, for guaranteeing to reach reliable degree of accuracy, said process is repeated 10 times by measuring system, ask for the net result of mean value as communication delay of communication delay, and utility command Delay_resp sends to other wireless sensers, after the clock of other wireless sensers calibration oneself, wireless senser 1 sends synchro measure order again, multiple wireless senser just can carry out synchronous acquisition at the same time, obtains the Mintrop wave moment of ultrasonic signal to each sensor of same discharge source generation.

3rd step, after the ultrasonic signal excited same discharge source carries out synchronous acquisition, after obtaining the moment of different sensors collection ultrasonic signal, utilize 4 sensor Received signal strength Mintrop wave moment from nearest (namely signal is maximum) of discharge source, the position of discharge source can be calculated based on formula (1).

Measuring and application:

The net synchronization capability of test synchro measure algorithm, method of testing is as follows, one pulse signal source is received simultaneously the signal gathering unit of 10 wireless sensers, the multiple sensor of above-mentioned steps is utilized synchronously to obtain the initial time calculating signal, compare the net synchronization capability between 10 wireless sensers with this, test statistics data are as shown in the table.

Table 1

As can be seen from the table, the multiple sensor synchronous error of detection system is less than 5 μ s, consider hyperacoustic velocity of propagation, theory orientation error is at grade, consider the issuable error such as the error of calculation and internal clock errors in signal Mintrop wave moment, actual location precision in centimetre-sized, can meet the requirement of power equipment shelf depreciation location completely.

Refer to Fig. 5, Fig. 5 is an embodiment power equipment shelf depreciation positioning system structure schematic diagram.

A kind of power equipment shelf depreciation positioning system, comprising:

Synchronization module 210, for selecting one as major clock from some wireless sensers, all the other wireless sensers as from clock, and to described major clock with carry out time synchronized from clock; Wherein, described wireless senser is distributed in the surrounding of power equipment measuring position, comprises the signal coupler, Signal-regulated kinase, the office that connect successively and puts burst length extraction module and wireless communication module;

Measurement module 230, sends synchro measure order for controlling described major clock to from clock, the described ultrasonic signal put synchronous acquisition power equipment measuring position at the same time and produce from clock with described major clock after receiving described synchro measure order;

Locating module 250, for being obtained the Mintrop wave moment that the ultrasonic signal of burst length extraction module record is put in office in each wireless senser by wireless form, and choose four Mintrop wave moment minimum in the described Mintrop wave moment, the position of power equipment shelf depreciation is determined according to the position of the wireless senser of four Mintrop wave moment and correspondence.

Above-mentioned power equipment shelf depreciation positioning system is intended adopting the mode of wireless communication network and synchro measure to realize the detection and location of type local-discharge ultrasonic signal, by wireless network transmissions information between the wireless sensor node of collection ultrasonic signal, and realize the synchronous acquisition of multiple sampled point, synchronization accuracy, within 5us, utilizes the time of reception of multiple ultrasonic signal coupling mechanism difference to realize the location of shelf depreciation.Compared with the existing partial discharge detecting system based on wired mode, quantity flexibility and changeability of the present invention, installation and dismounting, mobile in there is the incomparable dirigibility of existing system, and without the need to wiring, use safer.

In one embodiment, described synchronization module 210 performs and describedly can be further used for described major clock and the process of carrying out time synchronized from clock:

Control described major clock to from clock transmitting time synch command, wherein, described time synchronized order comprises the moment of transmitting time synch command, i.e. the first moment;

Receive the moment of described time synchronized order as the second moment from clock log, and send synch command return information in the 3rd moment to described major clock; Described major clock record receives the moment of synch command return information as the 4th moment, and is sent to from clock by described 4th moment;

According to described first moment, the second moment, the 3rd moment and the 4th moment calculate described major clock with from the communication delay of clock and clock offset times; The time from clock is calibrated according to described communication delay and clock offset times.

Major clock transmitting time synch command can be sent by the form of SYNC message, period, utilizes Follow_up information frame to be sent to from clock by the first moment simultaneously; Sending synch command return information from clock can by the form of Delay_Req message, and described 4th moment is sent to by major clock can by the form of Delay_Resp message from clock.

Further, described synchronization module 210 perform described according to described first moment, the second moment, the 3rd moment and the 4th moment calculate described major clock with can be further used for from the communication delay of clock and the process of clock offset times:

The first relational expression of communication delay and clock offset times is calculated according to described first moment and the second moment;

The second relational expression of communication delay and clock offset times is calculated according to described 3rd moment and the 4th moment;

According to described first relational expression and the second relational expression calculate described major clock with from the communication delay of clock and clock offset times.

In one embodiment, described first relational expression is:

T _offset＝T ₂-T ₁-T _Delay，

Wherein, T ₁represented for the first moment, T ₂represented for the second moment, T _offsetrepresent clock offset times, T _delayrepresent communication delay;

Described second relational expression is:

T _Delay＝T ₄-T ₃+T _offset，

Wherein, T ₃represented for the 3rd moment, T ₄represented for the 4th moment.

In one embodiment, according to described first relational expression and the second relational expression calculate described major clock with

From the communication delay of clock and the process of clock offset times, calculate described major clock with from time

The communication delay of clock and the formula of clock offset times are:

$T_{\mathrm{offset}}=\frac{(T_2-T_1)-(T_4-T_3)}{2},$

Wherein, T ₁represented for the first moment, T ₂represented for the second moment, T ₃represented for the 3rd moment, T ₄represented for the 4th moment, T _offsetrepresent clock offset times;

wherein, T _delayrepresent communication delay.

In one embodiment, the position that described locating module 250 performs the described wireless senser according to four Mintrop wave moment and correspondence determines that the process of the position of power equipment shelf depreciation is further used for:

Select a conduct reference moment in four Mintrop wave moment, calculate all the other Mintrop wave moment and the mistiming with reference to the moment;

Obtain the volume coordinate of wireless senser position corresponding to four Mintrop wave moment; The volume coordinate of the position of shelf depreciation is obtained, according to the position of the volume coordinate determination power equipment shelf depreciation of the position of shelf depreciation according to described mistiming and spatial coordinates calculation.

Further, in one embodiment, the formula calculating the volume coordinate of the position of shelf depreciation is:

$\begin{array}{c}{t}_{12}=[\sqrt{{\left({x-x}_2\right)}^2+{\left({y-y}_2\right)}^2+{\left({z-z}_2\right)}^2}-\sqrt{{\left({x-x}_1\right)}^2+{\left({y-y}_1\right)}^2+{\left({z-z}_1\right)}^2}]/v\\ t_{13}=[\sqrt{{\left({x-x}_3\right)}^2+{\left({y-y}_3\right)}^2+{\left({z-z}_3\right)}^2}-\sqrt{{\left({x-x}_1\right)}^2+{\left({y-y}_1\right)}^2+{\left({z-z}_1\right)}^2}]/v\\ t_{14}=[\sqrt{{\left({x-x}_4\right)}^2+{\left({y-y}_4\right)}^2+{\left({z-z}_4\right)}^2}-\sqrt{{\left({x-x}_1\right)}^2+{\left({y-y}_1\right)}^2+{\left({z-z}_1\right)}^2}]/v\end{array},$

Wherein, x, y, z represents the volume coordinate of the position of shelf depreciation, x ₁, y ₁, z ₁represent the volume coordinate with reference to wireless senser position corresponding to moment, x ₂, y ₂, z ₂represent the volume coordinate of the wireless senser position that first Mintrop wave moment in its excess-three Mintrop wave moment is corresponding, x ₃, y ₃, z ₃represent the volume coordinate of the wireless senser position that second Mintrop wave moment in its excess-three Mintrop wave moment is corresponding, x ₄, y ₄, z ₄represent the volume coordinate of the wireless senser position that the 3rd the Mintrop wave moment in its excess-three Mintrop wave moment is corresponding, t ₁₂represent first Mintrop wave moment in its excess-three Mintrop wave moment and the mistiming with reference to the moment, t ₁₃represent second Mintrop wave moment in its excess-three Mintrop wave moment and the mistiming with reference to the moment, t ₁₄represent the 3rd the Mintrop wave moment in its excess-three Mintrop wave moment and the mistiming with reference to the moment, v represents ultrasonic velocity.

In one embodiment, described wireless senser comprises: burst length extraction module and wireless communication module are put in the signal coupler connected successively, Signal-regulated kinase, office;

Described signal coupler, for the reception ultrasonic signal that is coupled, and is sent to described Signal-regulated kinase by described ultrasonic signal;

Described Signal-regulated kinase, for carrying out filtering to the described ultrasonic signal received and amplifying process, and is sent to described office by treated ultrasonic signal and puts burst length extraction module;

Burst length extraction module is put in described office, for recording the initial time of treated ultrasonic signal Mintrop wave;

Described wireless communication module, for carrying out radio communication and wireless synchronization between other wireless sensers.

Above-mentioned power equipment shelf depreciation positioning system, by the wireless senser being deployed in power equipment measuring position surrounding is carried out time synchronized, thus improve the degree of accuracy measured, then control major clock and send synchro measure order to from clock, the ultrasonic signal that synchronous acquisition power equipment measuring position produces, following acquisition office is put four Mintrop wave moment minimum in the Mintrop wave moment of the ultrasonic signal of burst length extraction module record and is determined the position of power equipment shelf depreciation by the position of the wireless senser of four Mintrop wave moment and correspondence, due to employing is that wireless senser is to carry out ultrasound acquisition and location, wireless form is adopted in Signal transmissions, there is less workload and higher security.

Each technical characteristic of the above embodiment can combine arbitrarily, for making description succinct, the all possible combination of each technical characteristic in above-described embodiment is not all described, but, as long as the combination of these technical characteristics does not exist contradiction, be all considered to be the scope that this instructions is recorded.

The above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be construed as limiting the scope of the patent.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.

Claims (10)

1. a power equipment partial discharge positioning method, is characterized in that, comprises the following steps:

From some wireless sensers, select one as major clock, all the other wireless sensers as from clock, and to described major clock with carry out time synchronized from clock; Wherein, described wireless senser is distributed in the surrounding of power equipment measuring position, comprises the signal coupler, Signal-regulated kinase, the office that connect successively and puts burst length extraction module and wireless communication module;

Control described major clock and send synchro measure order to from clock, the described ultrasonic signal put synchronous acquisition power equipment measuring position at the same time and produce from clock with described major clock after receiving described synchro measure order;

The Mintrop wave moment that the ultrasonic signal of burst length extraction module record is put in office in each wireless senser is obtained by wireless form, and choose four Mintrop wave moment minimum in the described Mintrop wave moment, the position of power equipment shelf depreciation is determined according to the position of the wireless senser of four Mintrop wave moment and correspondence.

2. power equipment partial discharge positioning method according to claim 1, is characterized in that, describedly comprises described major clock and the step of carrying out time synchronized from clock:

Control described major clock to from clock transmitting time synch command, wherein, described time synchronized order comprises the moment of transmitting time synch command, i.e. the first moment;

Receive the moment of described time synchronized order as the second moment from clock log, and send synch command return information in the 3rd moment to described major clock; Described major clock record receives the moment of synch command return information as the 4th moment, and is sent to from clock by described 4th moment;

According to described first moment, the second moment, the 3rd moment and the 4th moment calculate described major clock with from the communication delay of clock and clock offset times; The time from clock is calibrated according to described communication delay and clock offset times.

3. power equipment partial discharge positioning method according to claim 2, it is characterized in that, described according to described first moment, the second moment, the 3rd moment and the 4th moment calculate described major clock with comprise from the communication delay of clock and the step of clock offset times:

The first relational expression of communication delay and clock offset times is calculated according to described first moment and the second moment;

The second relational expression of communication delay and clock offset times is calculated according to described 3rd moment and the 4th moment;

According to described first relational expression and the second relational expression calculate described major clock with from the communication delay of clock and clock offset times.

4. power equipment partial discharge positioning method according to claim 3, is characterized in that, described first relational expression is:

T _offset＝T ₂-T ₁-T _Delay，

Wherein, T ₁represented for the first moment, T ₂represented for the second moment, T _offsetrepresent clock offset times, T _delayrepresent communication delay;

Described second relational expression is:

T _Delay＝T ₄-T ₃+T _offset，

Wherein, T ₃represented for the 3rd moment, T ₄represented for the 4th moment.

5. power equipment partial discharge positioning method according to claim 4, it is characterized in that, described according to described first relational expression and the second relational expression calculate described major clock with from the communication delay of clock and the step of clock offset times, calculate described major clock with from the communication delay of clock and the formula of clock offset times be:

$T_{\mathrm{offset}}=\frac{(T_2-T_1)-(T_4-T_3)}{2},$

Wherein, T ₁represented for the first moment, T ₂represented for the second moment, T ₃represented for the 3rd moment, T ₄represented for the 4th moment, T _offsetrepresent clock offset times;

wherein, T _delayrepresent communication delay.

6. power equipment partial discharge positioning method according to claim 1, is characterized in that, the position of the described wireless senser according to four Mintrop wave moment and correspondence determines that the step of the position of power equipment shelf depreciation comprises:

Select a conduct reference moment in four Mintrop wave moment, calculate all the other Mintrop wave moment and the mistiming with reference to the moment;

Obtain the volume coordinate of wireless senser position corresponding to four Mintrop wave moment; The volume coordinate of the position of shelf depreciation is obtained, according to the position of the volume coordinate determination power equipment shelf depreciation of the position of shelf depreciation according to described mistiming and spatial coordinates calculation.

7. power equipment partial discharge positioning method according to claim 6, it is characterized in that, describedly obtain in the step of the volume coordinate of the position of shelf depreciation according to described mistiming and spatial coordinates calculation, the formula calculating the volume coordinate of the position of shelf depreciation is:

$t_{12}=[\sqrt{{(x-x_2)}^2+{(y-y_2)}^2+{(z-z_2)}^2}-\sqrt{{(x-x_1)}^2+{(y-y_1)}^2+{(z-z_1)}^2}]/v$

$t_{13}=[\sqrt{{(x-x_3)}^2+{(y-y_3)}^2+{(z-z_3)}^2}-\sqrt{{(x-x_1)}^2+{(y-y_1)}^2+{(z-z_1)}^2}]/v$

$t_{14}=[\sqrt{{(x-x_4)}^2+{(y-y_4)}^2+{(z-z_4)}^2}-\sqrt{{(x-x_1)}^2+{(y-y_1)}^2+{(z-z_1)}^2}]/v,$

Wherein, x, y, z represents the volume coordinate of the position of shelf depreciation, x ₁, y ₁, z ₁represent the volume coordinate with reference to wireless senser position corresponding to moment, x ₂, y ₂, z ₂represent the volume coordinate of the wireless senser position that first Mintrop wave moment in its excess-three Mintrop wave moment is corresponding, x ₃, y ₃, z ₃represent the volume coordinate of the wireless senser position that second Mintrop wave moment in its excess-three Mintrop wave moment is corresponding, x ₄, y ₄, z ₄represent the volume coordinate of the wireless senser position that the 3rd the Mintrop wave moment in its excess-three Mintrop wave moment is corresponding, t ₁₂represent first Mintrop wave moment in its excess-three Mintrop wave moment and the mistiming with reference to the moment, t ₁₃represent second Mintrop wave moment in its excess-three Mintrop wave moment and the mistiming with reference to the moment, t ₁₄represent the 3rd the Mintrop wave moment in its excess-three Mintrop wave moment and the mistiming with reference to the moment, v represents ultrasonic velocity.

8. power equipment partial discharge positioning method according to claim 1, is characterized in that, described wireless senser comprises: burst length extraction module and wireless communication module are put in the signal coupler connected successively, Signal-regulated kinase, office;

Described signal coupler, for the reception ultrasonic signal that is coupled, and is sent to described Signal-regulated kinase by described ultrasonic signal;

Described Signal-regulated kinase, for carrying out filtering to the described ultrasonic signal received and amplifying process, and is sent to described office by treated ultrasonic signal and puts burst length extraction module;

Burst length extraction module is put in described office, for recording the initial time of treated ultrasonic signal Mintrop wave;

Described wireless communication module, for carrying out radio communication and wireless synchronization between other wireless sensers.

9. a power equipment shelf depreciation positioning system, is characterized in that, comprising:

Synchronization module, for selecting one as major clock from some wireless sensers, all the other wireless sensers as from clock, and to described major clock with carry out time synchronized from clock; Wherein, described wireless senser is distributed in the surrounding of power equipment measuring position, comprises the signal coupler, Signal-regulated kinase, the office that connect successively and puts burst length extraction module and wireless communication module;

Measurement module, sends synchro measure order for controlling described major clock to from clock, the described ultrasonic signal put synchronous acquisition power equipment measuring position at the same time and produce from clock with described major clock after receiving described synchro measure order;

Locating module, for being obtained the Mintrop wave moment that the ultrasonic signal of burst length extraction module record is put in office in each wireless senser by wireless form, and choose four Mintrop wave moment minimum in the described Mintrop wave moment, the position of power equipment shelf depreciation is determined according to the position of the wireless senser of four Mintrop wave moment and correspondence.

10. power equipment shelf depreciation positioning system according to claim 9, is characterized in that, described synchronization module execution is described to be further used for described major clock and the process of carrying out time synchronized from clock:

Control described major clock to from clock transmitting time synch command, wherein, described time synchronized order comprises the moment of transmitting time synch command, i.e. the first moment;

Receive the moment of described time synchronized order as the second moment from clock log, and send synch command return information in the 3rd moment to described major clock; Described major clock record receives the moment of synch command return information as the 4th moment, and is sent to from clock by described 4th moment;

According to described first moment, the second moment, the 3rd moment and the 4th moment calculate described major clock with from the communication delay of clock and clock offset times; The time from clock is calibrated according to described communication delay and clock offset times.