CN104793132A - Disconnecting switch contact state detection device and method based on electric field sensor - Google Patents

Disconnecting switch contact state detection device and method based on electric field sensor Download PDF

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CN104793132A
CN104793132A CN201510190661.XA CN201510190661A CN104793132A CN 104793132 A CN104793132 A CN 104793132A CN 201510190661 A CN201510190661 A CN 201510190661A CN 104793132 A CN104793132 A CN 104793132A
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electric
module
sensor
voltage
signal
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CN104793132B (en
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黄新波
石杰
张�浩
郭剑锋
邓凸
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Xian Polytechnic University
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Xian Polytechnic University
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Abstract

The invention discloses a disconnecting switch contact state detection device based on an electric field sensor. The disconnecting switch contact state detection device comprises a DSP (digital signal processor) unit, a DSP resetting module, a DSP crystal oscillation module, a liquid crystal display module, a starting button, a shielding plate opening button, a prewarning module and a photocoupling isolating module are connected on the DSP unit respectively, the photocoupling isolating module is connected with an A/D conversion module and a signal conditioning module respectively, a self-adaptive amplifying module, an electric field signal extracting module and an electric field sensor are connected on the A/D conversion module sequentially, and a temperature and humidity sensor is connected on the signal conditioning module. The invention further discloses a detection method based on the detection device. Complete electric isolation is realized, and requirements on insulating performance in the field of power system detection are guaranteed effectively. Contact state of a disconnecting switch can be acquired and prewarned, and parameters like voltage and environment can be displayed.

Description

Based on disconnector contact condition pick-up unit and the detection method of electric-field sensor
Technical field
The invention belongs to power transmission and transforming equipment offline inspection technical field, relate to a kind of disconnector contact condition pick-up unit based on electric-field sensor, the invention still further relates to a kind of detection method based on above-mentioned detection device.
Background technology
Electric power transmission line and transformer station are in order to the electric power energy of generating plant is flowed to user, along with the continuous progress of technology, user improves day by day for the requirement of the quality of power supply, the quality of power supply includes voltage swing, frequency and waveform, and these impacts affecting that relative system phase shortage brings are unconspicuous.Open-phase operation will make a big impact to system, due to three-phase current unbalance, the indivedual winding of generator, transformer may be made larger by electric current, cause superheating phenomenon, according to statistics, in various work, agricultural production asynchronous motor fault, because power supply breaks phase, certain phase winding broken string and make motor more than half by accounting for of burning; The negative sequence component electric current that three-phase current unbalance produces, make generator unit stator winding produce negative revolving magnetic field, the alternating current induced in rotor windings, causes added losses; And with the magnetic field interaction that rotor windings produces, cause unit vibration; The zero-sequence current produced during open-phase operation, can produce interference etc. to contiguous communication line.Therefore electric system phase-deficient operation should cause the enough attention of vast work about electric power personnel, does not preferably allow this situation occur, and when that occurs, then needs to make System recover arrive normal operation as early as possible.
Disconnector uses maximum a kind of high-tension apparatuses in high-voltage switch electric appliance, substantially all with primary cut-out with the use of.The principles and structure of itself is fairly simple, but due to use amount large, functional reliability requires high, all larger on the impact of the design of transformer station, construction and safe operation.
May there are three kinds of states between the dynamic/static contact of disconnector, one is significantly there is Separation between two contacts, shows that now disconnector disconnects completely; Two is completely closed between two contacts, shows that now disconnector both sides are connected completely; Three is seem closed between two contacts actually to disconnect, and it is closed for being exactly disconnector now to the impression of staff, but in fact it disconnects, and namely can not be completed power supply to follow-up system.The third situation causes its harm to be maximum because staff is difficult to know the inside story, it causes phase shortage most important reason, cause loose contact mainly due to isolation switch contact burn or loosened screw or do not contact, thus causing a certain mutually for powering on.But at substation field, these loose contacts or situation about not contacting be can't see, thus the voltage condition of disconnector outgoing line side has no way of learning at substation field, therefore for field operator and patrol officer, be necessary to detect disconnector contact condition.
The present invention is based on the contact condition of disconnector outgoing line side voltage condition to disconnector to judge.After circuit breaking, for healthy phases, its voltage and current can raise accordingly, this dielectric level for equipment proposes test, also threat is constituted to personal security simultaneously, so the system open-phase operation time can not be oversize, it should be made as early as possible to recover normal.The present invention uses the outgoing line side voltage of electric-field sensor to disconnector to detect, as found system open-phase operation, then can process accordingly immediately, use electric-field sensor main advantage to be: one is realize complete heed contacted measure, ensure that safety during detection; Two is that electric-field sensor is cheap, the cost of saveall greatly.
Summary of the invention
The object of this invention is to provide a kind of disconnector contact condition pick-up unit based on electric-field sensor, scene can be carried out to the voltage condition of disconnector outgoing line side easily and obtain.
The present invention also aims to the detection method that a kind of disconnector contact condition based on electric-field sensor is provided.
The first technical scheme of the present invention is, based on the disconnector contact condition pick-up unit of electric-field sensor, comprise dsp processor unit, dsp processor unit is also connected to DSP reseting module, DSP crystal oscillator module, LCD MODULE, start button, barricade opens button, warning module, light-coupled isolation module, light-coupled isolation module is also connected to A/D modular converter, Signal-regulated kinase, A/D modular converter is also connected with self-adaptation amplification module in turn, electric field signal extraction module, electric-field sensor, Signal-regulated kinase is also connected with Temperature Humidity Sensor.
The feature of the first technical scheme of the present invention is also,
Dsp processor unit is also connected with SRAM memory module.
Dsp processor unit is also connected with communication module.
The second technical scheme of the present invention is, based on the disconnector contact condition detection method of electric-field sensor, specifically implements according to following steps:
Step 1, electric-field sensor are placed in immediately below disconnector outlet, electric-field sensor will sense the electric field signal that three-phase is superimposed, and the electric field signal sensed is converted into voltage signal by electric-field sensor, voltage signal is extracted by electric field signal extraction module, then self-adaptation amplification module is sent into, self-adaptation amplification module is amplified to the input voltage range of applicable A/D modular converter requirement signal, then send into A/D modular converter, send into dsp processor unit finally by light-coupled isolation module; Temperature Humidity Sensor by collect survey the humiture information of environment by after Signal-regulated kinase, send into dsp processor unit by light-coupled isolation module;
Step 2, dsp processor unit carry out fast fourier transform to the voltage signal of discretize, conversion draws magnitude of voltage, dsp processor unit can based on the discrimination principles of disconnector contact condition, simultaneously in conjunction with the voltage condition of different electric pressure, determine the contact condition of isolating isolation switch contact according to surveyed voltage swing; When being determined as phase shortage, carry out alert process, and on Liquid Crystal Module, show the information such as phase shortage, voltage and environmental parameter, press lower barricade simultaneously and open button and proceed separate qualification.
The feature of the second technical scheme of the present invention is also,
Sample frequency f in step 1 in A/D modular converter sarranged by following formula by dsp processor unit:
f s=f N/512
Wherein, f n=50Hz is power frequency, and 512 gather 512 points for each cycle.
In step 2, dsp processor unit carries out fast fourier transform to the voltage signal of discretize, specifically implements according to following steps:
The voltage signal discrete series obtained after A/D modular converter is x (n), 0≤n≤N-1, N is sampling number, and k is the number of times of harmonic wave, carries out discrete Fourier transform (DFT) process to x (n) sequence:
X ( k ) = DFT [ x ( n ) ] = Σ n = 0 N - 1 x ( n ) e - j 2 π N kn = Σ n = 0 N - 1 x ( n ) ( cos 2 πkn N + j sin - 2 πkn N ) ,
Therefore the real part of known signal and imaginary part are respectively:
The real part of voltage signal is: X UR ( k ) = Σ n = 0 N - 1 x ( n ) cos 2 πkn N ,
Imaginary part is: X UI ( k ) = Σ n = 0 N - 1 x ( n ) sin - 2 πkn N ,
Therefore the size of voltage signal is: U m = [ X UR ( k ) ] 2 + [ X UI ( k ) ] 2 .
In step 2, survey to by: electric-field sensor electric field signal to the discrimination principles of disconnector contact condition is three superimposed signals, when electric-field sensor is positioned over immediately below a certain phase conductor, due to all far away apart from three-phase conducting wire electrical distance, so electric-field sensor is very little for the response voltage gap of three-phase conducting wire, and phase place is also mutually differ 120 °, like this when disconnector normally closed, electric-field sensor will form a little voltage U 1; When a certain phase contact is not closed, remaining other two phase voltages synthesize voltage U 1 when a larger voltage U 2, U2 is obviously greater than normal; When certain two-phase contact is not closed, a remaining other phase voltage U3, voltage U 3 is more smaller than U2, voltage U 1 when U3 is greater than normal; And when three-phase contact is all closed, rear end does not just have electric field signal, to survey magnitude of voltage U4 almost nil, integrated U2>U3>U1>U4.
When being determined as phase shortage in step 2, separate authentication method is: be placed in below circuit by the disconnector contact condition pick-up unit based on electric-field sensor, open based on the disconnector contact condition pick-up unit both sides of the electric-field sensor two piece metal shielding boards parallel with wire, detect mutually a certain, the now in addition basic conductively-closed of electric field signal that produces of two-phase, measured signal is exactly the reflection to this phase voltage substantially, as when originally isolated switch contact does not contact, to survey magnitude of voltage be just zero substantially, and when isolation switch contact contact is good, survey magnitude of voltage and U3 is suitable.
The invention has the beneficial effects as follows: the disconnector contact condition pick-up unit that the present invention is based on electric-field sensor adopts dsp processor unit as processor, realize the collection to disconnector outgoing line side voltage signal, mainly A/D sampling, FFT process are carried out to voltage signal, then analyze according to discrimination principles.When the contact of a certain isolated switch is not closed, its outgoing line side does not just have voltage, now can carry out corresponding early warning process, be designed with LCDs simultaneously, the information such as voltage, humiture can be shown, make work about electric power personnel can get rid of disconnector problem fast like this, complete normal power supply, effectively can prevent the serious consequence that high-tension apparatus or consumer bring because of phase-deficient operation.
Accompanying drawing explanation
Fig. 1 is the structural representation of disconnector contact condition pick-up unit of the present invention;
Fig. 2 is the structural representation of electric-field sensor in the present invention.
In figure, 1. electric-field sensor, 2. electric field signal extraction module, 3. self-adaptation amplification module, 4.A/D modular converter, 5. light-coupled isolation module, 6. Temperature Humidity Sensor, 7. Signal-regulated kinase, 8.DSP reseting module, 9.DSP crystal oscillator module, 10.DSP processor unit, 11.SRAM memory module, 12. LCD MODULE, 13. start buttons, 14. barricades open button, 15. warning modules, 16. communication modules, 17. top crowns, 18. bottom crowns, 19. insulating mediums, 20. signal wires, 21. conducting wire fixing clips.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
The present invention is based on the disconnector contact condition pick-up unit of electric-field sensor, structure as shown in Figure 1, comprise dsp processor unit 10, dsp processor unit 10 is also connected to DSP reseting module 8, DSP crystal oscillator module 9, SRAM memory module 11, LCD MODULE 12, start button 13, barricade opens button 14, warning module 15, communication module 16, light-coupled isolation module 5, light-coupled isolation module 5 is also connected to A/D modular converter 4, Signal-regulated kinase 7, A/D modular converter 4 is also connected with self-adaptation amplification module 3 in turn, electric field signal extraction module 2, electric-field sensor 1, Signal-regulated kinase 7 is also connected with Temperature Humidity Sensor 6.
Wherein electric-field sensor 1 Main Function is monitored disconnector outgoing line side voltage.The sharpest edges of electric-field sensor 1 are selected to be cheap and easy for installation, as long as be placed in the electric field that disconnector outgoing line side voltage formed.Achieve electrical isolation completely between whole measuring system and primary equipment simultaneously, effectively ensure that the requirement of electric system for insulating property.In the present invention, electric-field sensor 1 is capacitive battery field sensor, structure as shown in Figure 2, comprise top crown 17 and bottom crown 18 and central filler insulating medium 19, the surface of electric-field sensor 1 is connected with conducting wire fixing clip 21, conducting wire fixing clip is drawn signal wire 20, voltage between upper and lower two-plate is drawn by signal wire 20, sends into the extraction that follow-up voltage signal extraction module carries out voltage.The principle of work of capacitive battery field sensor 1 is: top crown 17 and bottom crown 18 are placed in the power frequency electric field that disconnector outgoing line side voltage is formed, the positive and negative charge of power frequency change will be assembled respectively, due to the effect of these electric charges, with regard to coating-forming voltage between two-plate, just by someway this voltage being extracted.The equal and opposite in direction of two-plate up and down of electric-field sensor 1, form identical, its material adopts metallic iron, and its shape can be circular and square.Middle insulating medium adopts glass or other suitable materials.The signal wire that upper and lower two-plate is drawn adopts the cable carrying screen layer, and its inner core adopts copper material, and its resistance is little, conducts electricity very well, and well can carry out the transmission of signal.
Wherein electric field signal extraction module 2 mainly applies the principle of instrumentation amplifier, front end shunt capacitance is connected with electric-field sensor 1 signal out again, shunt capacitance just can get voltage signal, now the input resistance of instrumentation amplifier is chosen to be more than megaohm rank, just can extract voltage signal substantially exactly.
Wherein self-adaptation amplification module 3 adopts programmable gain amplifier PGA204, and feature is high, the digital control programmable-gain of precision.By program according to input voltage size automatic control signal enlargement factor, be divided into level Four enlargement factor, there is advantages such as controlling flexibly, the linearity is high, reliable and stable.
The ADS8505 that wherein A/D modular converter 4 adopts is main devices, and ADS8505 can meet the demand of apparatus of the present invention from sample rate, precision.
Wherein light-coupled isolation module 5 Main Function divides the numerical portion of whole circuit and simulation part to carry out insulation blocking, and system can select 6N137 chip, HCPL0630 chip etc. as the main devices of light-coupled isolation.
Wherein Temperature Humidity Sensor 6 selects Switzerland Sensirion company SHTxx series of products SHT11 as Temperature Humidity Sensor, and this sensor mainly includes a temperature-sensing element (device) and a humidity sensing element, can conveniently measure temperature and humidity.
Wherein DSP reseting module 8 Main Function be affect by factors such as external interference at dsp processor unit 10, program fleet carries out reset processing to system when causing equipment normally to work.System adopts CAT1832V-GT3 chip as watchdog circuit main control chip, carries out reset operation in addition by what configure that push-button unit can also be artificial to system.
Wherein DSP crystal oscillator module 9 provides clock for dsp system work, adopts the external crystal oscillator of 30M.
Wherein dsp processor unit 10 has selected the TMS320F28335 model of TI company, has the advantages such as speed is fast, precision is high, cost is low, power consumption is little, performance is good, peripheral hardware integrated level is high, memory space is large, well can realize the process to signal.
Wherein SRAM memory module 11 Main Function stores the intermediate data in dsp system operational process, and device adopts IS61LV51216 chip, has the advantage that speed is fast, need not coordinate memory refresh circuit, can improve overall work efficiency.
Wherein LCD MODULE 12 Main Function shows information such as voltage, frequency and environmental parameters, and device adopts 12864 dot matrix lcd modules.
Wherein warning module 15 Main Function is, when detecting that isolation switch contact closes complete, will remind field personnel, to properly settle problem, device adopts model to be that the audible-visual annunciator of YS-01 is as warning module 15.
Wherein communication module 16 mainly for by data upload to electrical network background monitoring center, with the high-tension apparatus running state analysis of carrying out under meeting intelligent grid overall background.Communication module can select the modes such as 3G, ZigBee, WiFi.
In the present invention, the discrimination principles of disconnector contact condition is: electric-field sensor 1 survey electric field signal is three superimposed signals, when electric-field sensor 1 is positioned over immediately below a certain phase conductor, due to all far away apart from three-phase conducting wire electrical distance, so electric-field sensor 1 is very little for the response voltage gap of three-phase conducting wire, and phase place is also mutually differ 120 °, like this when disconnector normally closed, electric-field sensor 1 will form a little voltage U 1; When a certain phase contact is not closed, remaining other two phase voltages synthesize voltage U 1 when a larger voltage U 2, U2 is obviously greater than normal; When certain two-phase contact is not closed, a remaining other phase voltage U3, voltage U 3 is more smaller than U2, voltage U 1 when U3 is greater than normal; And when three-phase contact is all closed, rear end does not just have electric field signal, to survey magnitude of voltage U4 almost nil, integrated U2>U3>U1>U4.
When a phase having been detected or two-phase isolation switch contact does not contact and when non-three phase (phase shortage) runs, separate authentication method is: be placed in below circuit by the disconnector contact condition pick-up unit based on electric-field sensor, open based on the disconnector contact condition pick-up unit both sides of the electric-field sensor two piece metal shielding boards parallel with wire, detect mutually a certain, the now in addition basic conductively-closed of electric field signal that produces of two-phase, measured signal is exactly the reflection to this phase voltage substantially, as when originally isolated switch contact does not contact, to survey magnitude of voltage be just zero substantially, and when isolation switch contact contact is good, survey magnitude of voltage and U3 is suitable.
The present invention is based on the disconnector contact condition detection method of electric-field sensor, specifically implement according to following steps:
Step 1, electric-field sensor 1 are placed in immediately below disconnector outlet, electric-field sensor 1 will sense the electric field signal that three-phase is superimposed, and the electric field signal sensed is converted into voltage signal by electric-field sensor 1, voltage signal is extracted by electric field signal extraction module 2, then self-adaptation amplification module 3 is sent into, self-adaptation amplification module 3 is amplified to signal the input voltage range that applicable A/D modular converter 4 requires, then send into A/D modular converter 4, send into dsp processor unit 10 finally by light-coupled isolation module 5; Temperature Humidity Sensor 6 by collect survey the humiture information of environment by after Signal-regulated kinase 7, send into dsp processor unit 10 by light-coupled isolation module 5;
Wherein, the sample frequency f in A/D modular converter 4 sarranged by following formula by dsp processor unit 10:
f s=f N/512 (1)
Wherein, f n=50Hz is power frequency, and 512 gather 512 points for each cycle.
The voltage signal of step 2, dsp processor unit 10 pairs of discretizes carries out fast fourier transform:
The voltage signal discrete series obtained after A/D modular converter 4 is x (n), 0≤n≤N-1, N is sampling number, and k is the number of times of harmonic wave, carries out discrete Fourier transform (DFT) process to x (n) sequence:
X ( k ) = DFT [ x ( n ) ] = Σ n = 0 N - 1 x ( n ) e - j 2 π N kn = Σ n = 0 N - 1 x ( n ) ( cos 2 πkn N + j sin - 2 πkn N ) - - - ( 2 )
Therefore the real part of known signal and imaginary part are respectively:
The real part of voltage signal is: X UR ( k ) = Σ n = 0 N - 1 x ( n ) cos 2 πkn N - - - ( 3 )
Imaginary part is: X UI ( k ) = Σ n = 0 N - 1 x ( n ) sin - 2 πkn N - - - ( 4 )
Therefore the size of voltage signal is: U m = [ X UR ( k ) ] 2 + [ X UI ( k ) ] 2 - - - ( 5 )
Conversion draws magnitude of voltage U m, dsp processor unit 10 based on the discrimination principles of disconnector contact condition, simultaneously in conjunction with the voltage condition of different electric pressure, can determine the contact condition of isolating isolation switch contact according to surveyed voltage swing, i.e. magnitude of voltage U mcompare with U1, U2, U3, U4; If 1. U mclose to U1, then disconnector normally closed, if 2. U mclose to U4, then disconnector three-phase contact does not all close, if 3. U mclose to U2, then a phase contact is had not close, if 4. U mclose to U3, then two-phase contact does not close; When being determined as phase shortage (lack a phase or two-phase namely 3., 4. two kinds of situations), carry out alert process, and on Liquid Crystal Module, show the information such as phase shortage, voltage and environmental parameter, press lower barricade to open button and proceed separate qualification: if record this phase voltage close to showing this isolated switch contact normally closed during U3 simultaneously, if this phase voltage close to zero time show that this isolated switch contact does not close.
As required, can by surveyed data upload to electrical network background monitoring center, to be used as quality of voltage analysis.
In the present invention, electric-field sensor 1 pair of disconnector outgoing line side voltage is adopted to detect, cheap, easy for installation, achieve electrical isolation completely between whole pick-up unit and primary equipment simultaneously, effectively ensure that the requirement of power system measuring field for insulating property.Monitoring terminal adopts dsp processor unit 10 as processor, make full use of the feature of the quick computing power of dsp processor unit 10, signal being carried out to collection while, digitized processing is carried out at scene, and calculate the parameter information such as voltage magnitude, effective value, can on-the-spot early warning be carried out, voltage and ambient parameter information can be shown simultaneously.

Claims (8)

1. based on the disconnector contact condition pick-up unit of electric-field sensor, it is characterized in that, comprise dsp processor unit (10), dsp processor unit (10) is also connected to DSP reseting module (8), DSP crystal oscillator module (9), LCD MODULE (12), start button (13), barricade opens button (14), warning module (15), light-coupled isolation module (5), light-coupled isolation module (5) is also connected to A/D modular converter (4), Signal-regulated kinase (7), A/D modular converter (4) is also connected with self-adaptation amplification module (3) in turn, electric field signal extraction module (2), electric-field sensor (1), Signal-regulated kinase (7) is also connected with Temperature Humidity Sensor (6).
2. the disconnector contact condition pick-up unit based on electric-field sensor according to claim 1, is characterized in that, described dsp processor unit (10) is also connected with SRAM memory module (11).
3. the disconnector contact condition pick-up unit based on electric-field sensor according to claim 1, is characterized in that, described dsp processor unit (10) is also connected with communication module (16).
4. based on the disconnector contact condition detection method of electric-field sensor, it is characterized in that, adopt the disconnector contact condition pick-up unit based on electric-field sensor, concrete structure is:
Comprise dsp processor unit (10), dsp processor unit (10) is also connected to DSP reseting module (8), DSP crystal oscillator module (9), LCD MODULE (12), start button (13), barricade opens button (14), warning module (15), light-coupled isolation module (5), light-coupled isolation module (5) is also connected to A/D modular converter (4), Signal-regulated kinase (7), A/D modular converter (4) is also connected with self-adaptation amplification module (3) in turn, electric field signal extraction module (2), electric-field sensor (1), Signal-regulated kinase (7) is also connected with Temperature Humidity Sensor (6),
Specifically implement according to following steps:
Step 1, electric-field sensor (1) is placed in immediately below disconnector outlet, electric-field sensor (1) will sense the electric field signal that three-phase is superimposed, and the electric field signal sensed is converted into voltage signal by electric-field sensor (1), voltage signal is extracted by electric field signal extraction module (2), then self-adaptation amplification module (3) is sent into, self-adaptation amplification module (3) is amplified to signal the input voltage range that applicable A/D modular converter (4) requires, then A/D modular converter (4) is sent into, dsp processor unit (10) is sent into finally by light-coupled isolation module (5), Temperature Humidity Sensor (6) by collect survey the humiture information of environment by after Signal-regulated kinase (7), by light-coupled isolation module (5) send into dsp processor unit (10),
Step 2, dsp processor unit (10) carry out fast fourier transform to the voltage signal of discretize, conversion draws magnitude of voltage, dsp processor unit (10) can based on the discrimination principles of disconnector contact condition, simultaneously in conjunction with the voltage condition of different electric pressure, determine the contact condition of isolating isolation switch contact according to surveyed voltage swing; When being determined as phase shortage, carry out alert process, and on Liquid Crystal Module, show the information such as phase shortage, voltage and environmental parameter, press lower barricade simultaneously and open button and proceed separate qualification.
5. the disconnector contact condition detection method based on electric-field sensor according to claim 4, is characterized in that, the sample frequency f in described step 1 in A/D modular converter (4) sarranged by following formula by dsp processor unit (10):
f s=f N/512
Wherein, f n=50Hz is power frequency, and 512 gather 512 points for each cycle.
6. the disconnector contact condition detection method based on electric-field sensor according to claim 4, it is characterized in that, in described step 2, dsp processor unit (10) carries out fast fourier transform to the voltage signal of discretize, specifically implements according to following steps:
The voltage signal discrete series obtained after A/D modular converter (4) is x (n), 0≤n≤N-1, N is sampling number, and k is the number of times of harmonic wave, carries out discrete Fourier transform (DFT) process to x (n) sequence:
X ( k ) = DFT [ x ( n ) ] = Σ n = 0 N - 1 x ( n ) e - j 2 π N kn = Σ n = 0 N - 1 x ( n ) ( cos 2 πkn N + j sin - 2 πkn N ) ,
Therefore the real part of known signal and imaginary part are respectively:
The real part of voltage signal is: X UR ( k ) = Σ n = 0 N - 1 x ( n ) cos 2 πkn N ,
Imaginary part is: X UI ( k ) = Σ n = 0 N - 1 x ( n ) sin - 2 πkn N ,
Therefore the size of voltage signal is: U m = [ X UR ( k ) ] 2 + [ X UI ( k ) ] 2 .
7. the disconnector contact condition detection method based on electric-field sensor according to claim 4, it is characterized in that, in described step 2, the discrimination principles of disconnector contact condition is: electric-field sensor (1) survey electric field signal is three superimposed signals, when electric-field sensor (1) is positioned over immediately below a certain phase conductor, due to all far away apart from three-phase conducting wire electrical distance, so electric-field sensor (1) is very little for the response voltage gap of three-phase conducting wire, and phase place is also mutually differ 120 °, like this when disconnector normally closed, electric-field sensor (1) will form a little voltage U 1, when a certain phase contact is not closed, remaining other two phase voltages synthesize voltage U 1 when a larger voltage U 2, U2 is obviously greater than normal, when certain two-phase contact is not closed, a remaining other phase voltage U3, voltage U 3 is more smaller than U2, voltage U 1 when U3 is greater than normal, and when three-phase contact is all closed, rear end does not just have electric field signal, to survey magnitude of voltage U4 almost nil, integrated U2>U3>U1>U4.
8. the disconnector contact condition detection method based on electric-field sensor according to claim 7, it is characterized in that, when being determined as phase shortage in described step 2, separate authentication method is: be placed in below circuit by the disconnector contact condition pick-up unit based on electric-field sensor, open based on the disconnector contact condition pick-up unit both sides of the electric-field sensor two piece metal shielding boards parallel with wire, detect mutually a certain, the now in addition basic conductively-closed of electric field signal that produces of two-phase, measured signal is exactly the reflection to this phase voltage substantially, as when originally isolated switch contact does not contact, to survey magnitude of voltage be just zero substantially, and when isolation switch contact contact is good, survey magnitude of voltage and U3 is suitable.
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CN105487007A (en) * 2016-01-11 2016-04-13 江苏省电力公司淮安供电公司 Vibration analysis-based disconnecting switch state monitoring system
CN107631863A (en) * 2017-08-21 2018-01-26 西安工程大学 Mechanical characteristic of high-voltage circuit breaker monitoring system and its monitoring method
CN110376253A (en) * 2019-07-26 2019-10-25 华中科技大学 A kind of humidity sensor, preparation method and wet sensitive type switch trigger

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