CN103063368A - Monitoring system of sulfur hexafluoride (SF6) gas leakage - Google Patents
Monitoring system of sulfur hexafluoride (SF6) gas leakage Download PDFInfo
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Abstract
The invention discloses a monitoring system of sulfur hexafluoride (SF6) gas leakage. The monitoring system of the SF6 gas leakage comprises a host machine part, a remote terminal part and a signal transmission part, wherein the host machine part comprises a laser emission module, a gas signal reception module and a gas signal processing module. The remote terminal part comprises at least one remote terminal unit. Each remote terminal unit comprises a laser source, a laser detector and a gas measuring unit. The signal transmission part comprises a forward direction laser transmission module and a gas detection pass back module. Compared with the prior art, the monitoring system of the SF6 gas leakage can veritably monitor the leakage condition of the SF6 of the monitored point, automatic monitoring of the SF6 gas leakage is achieved, and the time of patrol and overhaul of workers on site are reduced.
Description
Technical field
The present invention relates to the detection field of electrical equipment, particularly a kind of detection system for detection of sulfur hexafluoride in the electrical equipment (SF6) Leakage Gas.
Background technology
SF6 is as the electric insulation medium of a new generation, have superpower insulating capacity and arc extinguishing ability, and has a noncombustibility, at first in isolating switch and combined electrical apparatus, use in the sixties in 20th century, enlarge in recent years and be applied to transformer, cable etc., the SF6 air insulating device comprises transformer, isolating switch, mutual inductor, the gas-insulating and fully-enclosed combined electrical apparatus of GIS(), become the main development direction of high-tension apparatus.
The analytical approach that is applied at present SF6 electrical equipment malfunction gas mainly contains vapor-phase chromatography, gas chromatography-mass spectrum is used in conjunction method, infra-red sepectrometry, electrochemical methods, chemical staining method etc.
Sonic method is the slow-footed characteristics that the velocity ratio of utilizing sound wave to propagate in SF6 gas is propagated in atmosphere, detects, and its sensitivity that detects the SF Leakage Gas is low; And be only suitable for leakage location, zonule, be not suitable for the large tracts of land on-line monitoring.Electrochemical gas sensor is the concentration that detects gas by detecting electric current, is that a kind of non-special-purpose SF6 detects usefulness, is not suitable for long-time on-line monitoring.The ultraviolet ionization method is to add certain material, utilizes SF6 gas absorption characteristic, detects the concentration of adsorbate, and its detection sensitivity is high, but owing to needing to add particular matter, is not suitable for on-line monitoring.The electron capture method is to utilize the electronegativity of SF6 gas, and namely the SF6 gas molecule characteristic that can catch the free movement electronics is measured the concentration of SF6 gas.This method highly sensitive; But the measuring equipment volume is large, is only suitable for the laboratory high precision and detects, and is not suitable for the large tracts of land on-line monitoring.Also has a kind of method of measuring the SF6 Leakage Gas by absorption spectrum.Because gas atom has fixing spectral absorption characteristics, therefore can measure by spectrographic technique.In this method, usually laser beam need to be transmitted in the gas, then the signal of receiving end is analyzed.Typical Representative is the laser imaging method, namely utilizes SF6 gas to the strong absorption characteristic of a certain infrared spectrum, and search coverage is carried out the qualitative detection that light spectrum image-forming is realized the SF Leakage Gas.This laser imaging method is highly sensitive, leaks the location but be only suitable for the zonule, is not suitable for the large tracts of land on-line monitoring.
Above method can only be monitored at needs the monitoring point Site Detection SF6 Leakage Gas of SF6 Leakage Gas mostly; Perhaps need the band detection gas of monitoring point is extracted in the closed container, closed container is taken back the laboratory measure.Because a plurality of electrical equipments usually are distributed in the larger geographic range, if need to monitor the SF6 Leakage Gas of a plurality of electrical equipments, traditional SF6 gas leak detection method all needs the staff to process to the scene, monitoring point at every turn.Therefore the work efficiency that detects in order to improve the SF6 Leakage Gas needs a kind ofly can need not the staff and patrol and examine to the scene, and the method that can be simultaneously the SF6 Leakage Gas of a plurality of diverse geographic locations be detected.
Summary of the invention
Above-mentioned shortcoming and deficiency in order to overcome prior art the object of the present invention is to provide a kind of SF6 Leakage Gas monitoring system, can carry out remote online monitoring to a plurality of monitoring points.
Purpose of the present invention is achieved through the following technical solutions:
A kind of SF6 Leakage Gas monitoring system comprises host machine part, remote terminal part and signal hop,
Described host machine part comprises laser emitting module, gas signal receiver module, gas signal processing module;
Described remote terminal partly comprises at least one remote-terminal unit; Each remote-terminal unit comprises lasing light emitter, laser detector and gas measurement unit;
Described signal hop comprises the gentle health check-up survey of forward Laser Transmission module signal return module;
Described laser emitting module is transferred to the laser of the specific wavelength of emission the lasing light emitter of remote-terminal unit by forward Laser Transmission module, lasing light emitter is sent to the laser of specific wavelength in the gas measurement unit, and the laser of specific wavelength is received by laser detector after passing gas measurement unit; Laser detector is converted to electric signal with the laser energy that detects, and is called gas detection signals; Gas detection signals is sent to the gas signal receiver module by gas detection signals passback module, and by the gas signal processing module gas detection signals is processed, and judges whether to exist the SF6 Leakage Gas;
Described specific wavelength is the peak absorbtivity wavelength of SF6 gas.
Further, described laser emitting module comprises laser instrument, focus set and laser couplers, and the laser that generates from laser instrument focuses on by focus set; Laser coupled after will focusing on by laser couplers again is in optical fiber.
Further, described laser emitting module also comprises power controller, is used for the laser power that the control laser instrument generates.
Described gas detection signals is sent to the gas signal receiver module by gas detection signals passback module, be specially: the gas detection signals from remote-terminal unit increases mark by the gas signal receiver module, be called and be with markd gas detection signals, the corresponding remote-terminal unit of each mark; The gas signal receiver module receives the electric signal of a plurality of remote-terminal units simultaneously, or receives respectively the gas detection signals of a plurality of remote-terminal units according to the time series mode.
Further, described gas signal processing module comprises
Signal pre-processing module is used for that gas detection signals is carried out filtering and processes;
Characteristic extracting module is used for gas detection signals after pretreatment is extracted characteristic;
The signal comparison module carries out feature relatively for the characteristic of the gas to be measured that will extract and pre-stored SF6 gas characteristic data.
Preferably, described gas measurement unit is a porose container, and lasing light emitter, laser detector are separately fixed at the two ends of porose container; Out laser is received by laser detector behind porose container from lasing light emitter, is the gas detection signals of gas to be measured;
The gas detection signals of described gas to be measured is sent to the gas signal receiver module by gas detection signals passback module, by the gas signal receiver module and increase mark, is sent to the gas signal processing module again.
Preferably, described gas measurement unit is full of the airtight container of reference gas, a porose container and a light-dividing device by one and forms; Described laser detector is comprised of the first laser detector and the second laser detector; Light-dividing device is fixed on an end of airtight container, porose container, and the first laser detector is fixed on the other end of airtight container, and the second laser detector is fixed on the other end of porose container; Lasing light emitter is fixed on a side of light-dividing device;
Out laser is divided into two bundle laser of identical wavelength through light-dividing device from lasing light emitter, is wherein a branch ofly received by the first laser detector behind airtight container, as the reference signal; Another bundle is received by the second laser detector behind porose container, is the gas detection signals of gas to be measured;
The gas detection signals of described reference signal and gas to be measured is sent to the gas signal receiver module by gas detection signals passback module, increases mark by the gas signal receiver module, is sent to the gas signal processing module again.
Described laser detector also is connected with the detection sensitivity adjusting gear, be used for to adjust the sensitivity of the laser energy that laser detector receives.
Described forward Laser Transmission module comprises optical fiber, optical splitter, and described optical splitter is linked into laser beam in the lasing light emitter of a plurality of remote-terminal units;
The mode that described optical splitter is linked into laser beam the lasing light emitter of a plurality of remote-terminal units accesses for simultaneously access or in the sequence mode.
Described forward Laser Transmission module also comprises the laser energy multiplying arrangement, and described laser energy multiplying arrangement is for increasing the energy from optical splitter laser beam out.
Compared with prior art, the present invention has the following advantages and beneficial effect:
1, the laser signal of SF6 Leakage Gas monitoring system of the present invention adopts the Optical Fiber Transmission mode, and laser signal directly is sent to the monitoring point, do not need the gas collecting in zone to be monitored or pump to other position, can monitor truly the SF6 leakage situation of monitored point, can realize the automatic monitoring of SF6 Leakage Gas situation, reduce staff's scene and maked an inspection tour the maintenance number of times.
2, SF6 Leakage Gas monitoring system of the present invention can adopt in the monitoring point single or a plurality of remote-terminal units that the laser energy signal is measured, and by the comparison process between a plurality of laser energy signals, can improve the stability that SF6 gas detects.
3, SF6 Leakage Gas monitoring system of the present invention is utilized SF6 gas absorption spectra characteristic, and (medium that the laser of 1050nm～1060nm) detects as SF6 gas, the accuracy that the SF6 Leakage Gas detects is improved significantly to adopt specific wavelength.
Description of drawings
Fig. 1 is the composition schematic diagram of the SF6 Leakage Gas monitoring system of embodiment 1.
Fig. 2 is the gas measurement unit schematic diagram of embodiment 1.
Fig. 3 is the gas measurement unit schematic diagram of embodiment 2.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
Embodiment 1
As shown in Figure 1, the SF6 Leakage Gas monitoring system of the present embodiment comprises host machine part, remote terminal part and signal hop.Described host machine part comprises laser emitting module, gas signal receiver module, gas signal processing module; Described remote terminal partly comprises at least one remote-terminal unit; Each remote-terminal unit comprises lasing light emitter, laser detector and gas measurement unit; Described signal hop comprises the gentle health check-up survey of forward Laser Transmission module signal return module.
Described laser emitting module is transferred to the laser of the specific wavelength of emission the lasing light emitter of remote-terminal unit by forward Laser Transmission module, lasing light emitter is sent to the laser of specific wavelength in the gas measurement unit, and the laser of specific wavelength is received by laser detector after passing gas measurement unit; Laser detector is converted to electric signal with the laser energy that detects, and is called gas detection signals; Gas detection signals is sent to the gas signal receiver module by gas detection signals passback module, and by the gas signal processing module gas detection signals is processed, and judges whether to exist the SF6 Leakage Gas.
1, host machine part
1.1 laser emitting module
Laser emitting module comprises laser instrument, focus set and laser couplers, and the laser that generates from laser instrument focuses on by focus set; Laser coupled after will focusing on by laser couplers again is in optical fiber.The laser of specific wavelength refers to the peak absorbtivity wavelength of SF6 gas, i.e. near laser the 1055nm.Specifically, the wavelength peak of the laser that emits exactly is near the laser the 1055nm, and for example wavelength coverage is the laser of 1050nm～1060nm.
1.2 gas signal receiver module
The gas signal receiver module can receive the SF6 gas detection signals by multiple diverse ways, and for example the wire transmission network receives signal or wireless-transmission network.Need a receiving trap, come the receiver gases detection signal such as network interface card, modulator-demodular unit etc.A receiving trap can receive the signal of a plurality of separate sources simultaneously.
The gas signal receiver module can receive the gas detection signals from a plurality of remote-terminal units.Increase mark such as the gas detection signals that receives from remote-terminal unit 1, remote-terminal unit 2 and remote-terminal unit N by the gas signal receiver module, the corresponding remote-terminal unit of each mark, be called and be with markd gas detection signals, for example the gas detection signals of remote-terminal unit 1, remote-terminal unit 2 and remote-terminal unit N is marked as respectively S1, S2 and SN.
The gas signal receiver module can receive the gas detection signals of a plurality of separate sources simultaneously, for example receives simultaneously S1, S2 and SN; Also can receive respectively according to the time series mode gas detection signals of separate sources, for example receive first S2, wait the S2 signal data to receive after, receive again S1, wait the S1 signal data to receive after, receive at last the signal data of SN.
Be with markd gas detection signals, for example S1, S2 and SN can be the laser energy signals of gas to be detected, also can be laser energy signal and the reference laser energy signals of gas to be detected.The laser energy signal is the numerical signal of the energy size that comprises of expression laser.The laser energy signal of gas to be detected is the energy size that comprises through the laser after the gas absorption to be detected.For example, the laser energy signal indication of the detection of the band among S1, S2 and SN gas is S1_test, S2_test and SN_test.
1.3 the gas signal processing module comprises signal pre-processing module, characteristic extracting module and signal comparison module.
1.3.1 signal pre-processing module is used for that gas detection signals is carried out filtering and processes the interfere information in the filtering gas detection signals.These interfere informations may be from the data movement in the signals transmission, or because the interference that other non-SF6 gases cause in the gas signal testing process, or because other interference in the gas signal testing process.By filtering interfering information, can improve the accuracy of detection of SF6 gas signal.
1.3.2 characteristic extracting module is used for gas detection signals after pretreatment is extracted characteristic; Characteristic signal includes but not limited to the peak value of signal intensity, signal duration, signal.After for example being labeled as the gas detection signals process filtering processing of S1, the S1_tes_filter that obtains is designated as F1_test through the feature that obtains after the feature extraction.Characteristic signal is represented as one group of data sequence, and for example, F1_test is one group of data sequence.
1.3.3 the signal comparison module carries out feature relatively for the characteristic of the gas to be measured that will extract and pre-stored SF6 gas characteristic data.The feature comparative approach includes but not limited to related coefficient comparative approach, absolute value difference comparative approach, poor quadratic sum comparative approach etc., any two groups of different pieces of information sequences are carried out similarity method relatively can be as the feature comparative approach.If result of calculation surpasses certain threshold value, judge that then the SF6 gas detection signals is similar to the SF6 gas signal, the SF6 Leakage Gas has appearred in corresponding monitoring point.
2, remote terminal part
Remote terminal partly comprises a plurality of remote-terminal units; Each remote-terminal unit comprises lasing light emitter, laser detector and gas measurement unit.As shown in Figure 2, the gas measurement unit in the present embodiment is a porose container 11, and extraneous gas can penetrate by the hole on the gas measurement unit.If when therefore there was SF6 gas the gas measurement unit outside, also there was SF6 gas the inside of gas detection cell.Lasing light emitter 12, laser detector 13 are separately fixed at the two ends of porose container 11.Lasing light emitter and laser detector are by accurate calibration, so that the laser of emission can be aligned in the center of laser detector by behind the gas measurement unit, laser detector can be converted to electric signal with laser energy as much as possible.The material of porose container can be glass, metal etc., can guarantee that SF6 gas can not absorbed or pass by this material to get final product.
Out laser is received by laser detector behind porose container from lasing light emitter, is the gas detection signals of gas to be measured; The gas detection signals of described gas to be measured is sent to the gas signal receiver module by gas detection signals passback module, by the gas signal receiver module and increase mark, is sent to the gas signal processing module again.
3, signal hop
The signal hop comprises the gentle health check-up survey of forward Laser Transmission module signal return module.
3.1 forward Laser Transmission module comprises optical fiber, optical splitter, is responsible for the specific wavelength that laser emitting module emits is delivered to the remote terminal part by optical fiber transmission.
Optical splitter is linked into laser beam in the lasing light emitter of a plurality of remote-terminal units.The laser of laser emitting module emission all is the laser of same specific wavelength with the laser that enters into lasing light emitter, and just laser energy exists different.Optical splitter can be linked into laser beam in a plurality of remote-terminal units simultaneously, also laser can be linked in a plurality of remote-terminal units in the sequence mode.
3.2 gas detection signals passback module is sender unit, the SF6 gas detection signals of being responsible for laser detector is transmitted is sent to host machine part.Can transmit the SF6 gas detection signals by multiple diverse ways, for example the wire transmission network receives signal or wireless-transmission network.Therefore need a dispensing device, such as network interface card, modulator-demodular unit etc., send the SF6 gas detection signals.
Embodiment 2
The present embodiment is except following feature, and all the other features and embodiment 1 are same.
The laser emitting module of the present embodiment also comprises power controller, is used for the laser power that the control laser instrument generates.According to different practical application scenes, need to use the laser of different capacity.For example, when there being a plurality of monitoring points to detect, and during monitoring point and Surveillance center distant, can adjust the laser power that controller increases the laser instrument emission.
The laser detector of the present embodiment also is connected with the detection sensitivity adjusting gear, be used for to adjust the sensitivity of the laser energy that laser detector receives.By the detection sensitivity adjusting gear is set, can adjust the sensitivity of the laser energy that laser detector receives.Because after laser passed through Optical Fiber Transmission, laser energy can be decayed, after the laser that therefore emits from same laser emitting module passed through the Optical Fiber Transmission of different distance, the laser energy that can be detected by laser detector was different.By the detector sensitivity adjusting gear is set, the laser of different laser energy can be adjusted to same levels by the laser energy signal that laser detector detects.
The forward Laser Transmission module of the present embodiment comprises optical fiber, optical splitter and laser energy multiplying arrangement, described luminous energy multiplying arrangement is for increasing the energy from optical splitter laser beam out, to guarantee that the laser that enters lasing light emitter has enough laser energies, laser amplification device has just increased the energy of laser, but does not change the wavelength of laser.
As shown in Figure 3, the gas measurement unit of the present embodiment is full of the airtight container 111 of reference gas, a porose container 112 and a light-dividing device 14 by one and forms; Described laser detector is comprised of laser detector 131 and laser detector 132; Light-dividing device 14 is fixed on an end of airtight container 111, porose container 112, and laser detector 131 is fixed on the other end of airtight container 111, and laser detector 132 is fixed on the other end of porose container 112; Lasing light emitter 12 is fixed on a side of light-dividing device 14.Out laser is divided into two bundle laser of identical wavelength through light-dividing device 14 from lasing light emitter 12, is wherein a branch ofly received by laser detector 131 behind airtight container 111, as the reference signal; Another bundle is received by laser detector 132 behind porose container 112, as the gas detection signals of gas to be measured.The gas detection signals of described reference signal and gas to be measured is sent to the gas signal receiver module by gas detection signals passback module, increases mark by the gas signal receiver module, is sent to the gas signal processing module again.For example, the reference laser energy signal among S1, S2 and the SN is masked as S1_ref, S2_ref and SN_ref, the gas detection signals of gas to be measured is masked as S1_test, S2_test and SN_test.
Because the laser detector in the present embodiment is reference signal detection when detecting gas detection signals to be measured, so gas detection signals passback module, signal pre-processing module, characteristic extracting module, signal comparison module need process gas detection signals and the reference signal of gas to be measured simultaneously.Wherein, characteristic extracting module also need be extracted the gas detection signals of gas to be detected and the difference of reference signal.A kind of method of calculated difference is that the gas detection signals of the gas to be measured of each monitoring point and reference signal are directly subtracted each other, and for example S1_ref and S1_test is subtracted each other, and obtains S1_diff.Other methods of calculating the difference of two groups of signals also are applicable to the present embodiment, do not do too much description at this.
Because do not have SF6 gas in the reference signal, when in the gas to be measured SF6 gas being arranged, significant difference can appear in the value of S1_ref and S1_test, thereby peak value can appear in S1_diff; When in the gas to be measured during without SF6 gas, the value of S1_ref and S1_test is very approaching, thereby S1_diff approaches and 0.By said method, can realize that the high precision of SF6 gas detects, thereby eliminate the inaccurate impact of accuracy of detection that laser power variation causes.
Above-described embodiment is the better embodiment of the present invention; but embodiments of the present invention are not limited by the examples; remote terminal partly also can adopt the form of single remote terminal as described; other any do not deviate from change, the modification done under Spirit Essence of the present invention and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (10)
1. a SF6 Leakage Gas monitoring system is characterized in that, comprises host machine part, remote terminal part and signal hop,
Described host machine part comprises laser emitting module, gas signal receiver module, gas signal processing module;
Described remote terminal partly comprises at least one remote-terminal unit; Each remote-terminal unit comprises lasing light emitter, laser detector and gas measurement unit;
Described signal hop comprises the gentle health check-up survey of forward Laser Transmission module signal return module;
Described laser emitting module is transferred to the laser of the specific wavelength of emission the lasing light emitter of remote-terminal unit by forward Laser Transmission module, lasing light emitter is sent to the laser of specific wavelength in the gas measurement unit, and the laser of specific wavelength is received by laser detector after passing gas measurement unit; Laser detector is converted to electric signal with the laser energy that detects, and is called gas detection signals; Gas detection signals is sent to the gas signal receiver module by gas detection signals passback module, and by the gas signal processing module gas detection signals is processed, and judges whether to exist the SF6 Leakage Gas;
Described specific wavelength is the peak absorbtivity wavelength of SF6 gas.
2. SF6 Leakage Gas monitoring system according to claim 1 is characterized in that, described laser emitting module comprises laser instrument, focus set and laser couplers, and the laser that generates from laser instrument focuses on by focus set; Laser coupled after will focusing on by laser couplers again is in optical fiber.
3. SF6 Leakage Gas monitoring system according to claim 2 is characterized in that, described laser emitting module also comprises power controller, is used for the laser power that the control laser instrument generates.
4. SF6 Leakage Gas monitoring system according to claim 1, it is characterized in that, described gas detection signals is sent to the gas signal receiver module by gas detection signals passback module, be specially: the gas detection signals from remote-terminal unit increases mark by the gas signal receiver module, be called and be with markd gas detection signals, the corresponding remote-terminal unit of each mark; The gas signal receiver module receives the electric signal of a plurality of remote-terminal units simultaneously, or receives respectively the gas detection signals of a plurality of remote-terminal units according to the time series mode.
5. SF6 Leakage Gas monitoring system according to claim 1 is characterized in that, described gas signal processing module comprises
Signal pre-processing module is used for that gas detection signals is carried out filtering and processes;
Characteristic extracting module is used for gas detection signals after pretreatment is extracted characteristic;
The signal comparison module carries out feature relatively for the characteristic of the gas to be measured that will extract and pre-stored SF6 gas characteristic data.
6. SF6 Leakage Gas monitoring system according to claim 1 is characterized in that, described gas measurement unit is a porose container, and lasing light emitter, laser detector are separately fixed at the two ends of porose container; Out laser is received by laser detector behind porose container from lasing light emitter, is the gas detection signals of gas to be measured;
The gas detection signals of described gas to be measured is sent to the gas signal receiver module by gas detection signals passback module, by the gas signal receiver module and increase mark, is sent to the gas signal processing module again.
7. SF6 Leakage Gas monitoring system according to claim 1 is characterized in that, described gas measurement unit is full of the airtight container of reference gas, a porose container and a light-dividing device by one and forms; Described laser detector is comprised of the first laser detector and the second laser detector; Light-dividing device is fixed on an end of airtight container, porose container, and the first laser detector is fixed on the other end of airtight container, and the second laser detector is fixed on the other end of porose container; Lasing light emitter is fixed on a side of light-dividing device;
Out laser is divided into two bundle laser of identical wavelength through light-dividing device from lasing light emitter, is wherein a branch ofly received by the first laser detector behind airtight container, as the reference signal; Another bundle is received by the second laser detector behind porose container, is the gas detection signals of gas to be measured;
The gas detection signals of described reference signal and gas to be measured is sent to the gas signal receiver module by gas detection signals passback module, increases mark by the gas signal receiver module, is sent to the gas signal processing module again.
8. SF6 Leakage Gas monitoring system according to claim 1 is characterized in that, described laser detector also is connected with the detection sensitivity adjusting gear, be used for to adjust the sensitivity of the laser energy that laser detector receives.
9. SF6 Leakage Gas monitoring system according to claim 1 is characterized in that, described forward Laser Transmission module comprises optical fiber, optical splitter, and described optical splitter is linked into laser beam in the lasing light emitter of a plurality of remote-terminal units;
The mode that described optical splitter is linked into laser beam the lasing light emitter of a plurality of remote-terminal units accesses for simultaneously access or in the sequence mode.
10. SF6 Leakage Gas monitoring system according to claim 9 is characterized in that, described forward Laser Transmission module also comprises the laser energy multiplying arrangement, and described laser energy multiplying arrangement is for increasing the energy from optical splitter laser beam out.
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| CN104198130A (en) * | 2014-09-19 | 2014-12-10 | 国家电网公司 | SF6 gas leakage detection method base on fractional laser-induced breakdown spectroscopy |
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