CN102937691B - A kind of mine cable partial discharge monitoring and positioning intelligent device - Google Patents
A kind of mine cable partial discharge monitoring and positioning intelligent device Download PDFInfo
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- CN102937691B CN102937691B CN201210441963.6A CN201210441963A CN102937691B CN 102937691 B CN102937691 B CN 102937691B CN 201210441963 A CN201210441963 A CN 201210441963A CN 102937691 B CN102937691 B CN 102937691B
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Abstract
The present invention is a kind of mine cable partial discharge monitoring and positioning intelligent device, primarily of High Frequency Current Sensor, impulse ejection antenna, high frequency signal cable and monitoring main frame composition.During Site Detection, place set of device respectively at two working section substation cable grounding line ends.Impulse ejection antenna is connected with monitoring main frame with high frequency signal cable, and monitoring host computer control impulse ejection circuit produces the amplitude high-frequency pulse signal all variable with frequency, and passes through impulse ejection antenna-coupled in tested cable.High Frequency Current Sensor is connected with monitoring main frame by high frequency cable, this Coil Detector the high-frequency pulse signal received in cable, monitoring main frame can launch a high-frequency impulse immediately when high-frequency pulse signal being detected, the exomonental amplitude of institute is identical with received pulse with frequency.By said process, when completing accurate pair of cable two ends, reach the object of accurate positioning cable shelf depreciation point.
Description
Technical field
The present invention relates to mine power equipment state of insulation on-line monitoring technique and application thereof, particularly relate to non-intrusion type partial discharge monitoring and location correlative technology field when carrying out Condition assessment of insulation for mine cable.
Background technology
In mine power cable insulation state monitoring, to analyze with localization of fault be the important content of mine electric device maintenance, is also be the necessary monitoring means of guarantee mine safety.This year, urban distribution network administrative authority is by installing the pulse current that ground wire is flow through in High Frequency Current Sensor measurement in short-term or for a long time at power cable ground wire place, analyze intensity and frequency, the monitoring power cable state of insulation of shelf depreciation, obtain good practice effect.But also there is some technical matterss not yet to solve, strong background noise interference when mainly containing on-line monitoring, high-frequency impulse velocity of propagation is estimated inaccurate, and when high-frequency impulse is propagated, attenuation factor is difficult to determine, cause the poor effect of insulation state monitoring, it is often wrong that point location is put in office.On the other hand, the detection technique of these advanced persons is not used in the middle of the safety detection of mine power equipment, cannot promote the malfunction monitoring of power equipment and the technical merit of localization of fault in mine.
For cable insulation status monitoring and localization of fault in mine, the main difficulty faced at present has following several aspect:
First, ground unrest interference problem: under on-line monitoring environment, a lot of outside strong electromagnetic can pass through grounded screen, grounding copper bar, the propagation of cable grounding alignment electrical network, and the discharge signal of these strong jammings usually than actual is large, cause signal to noise ratio (S/N ratio) when detecting very low, Partial discharge signal is difficult to extract.Also cause the emitter false triggering of fault location system, localization of fault difficulty strengthens, localization of fault inefficiency simultaneously.
Secondly, high-frequency impulse in the cable velocity of propagation not easily accurately estimates it is also the important problem that cable insulation state on_line monitoring and fault location system face.Currently achieved system, the velocity of propagation used during localization of fault generally gets empirical value, and under supposing various situation, this velocity of propagation all remains unchanged, and this is not often inconsistent with actual conditions, and cause positioning error comparatively large, fault handling is wasted time and energy.
Therefore, a kind of safe, portable, efficient cable insulation status monitoring of design and fault locator, solve the problem of mine cable partial discharge monitoring and location, ensureing the safe operation of mine power equipment, is the study hotspot of current industry.
Summary of the invention
The invention provides a kind of mine cable partial discharge monitoring and positioning intelligent device, there is the features such as safe, portable, flexible and accurate, the problem such as can solve current mining power cable state of insulation on-line monitoring to a great extent and fault location system detection sensitivity is low, localization of fault efficiency is not high, improve the technical merit of association area, compensate for monitoring technology deficiency in actual applications.
A kind of mine cable partial discharge monitoring of the present invention and positioning intelligent device, primarily of High Frequency Current Sensor, impulse ejection antenna, high frequency signal cable and monitoring main frame composition, described High Frequency Current Sensor is connected with monitoring main frame by high frequency signal cable, described impulse ejection antenna is connected with monitoring main frame by high frequency signal cable, described monitoring main frame comprises pulse receiving circuit, analog input card, impulse ejection circuit and industrial computer, two working section substations install a described on-line monitoring and positioning intelligent device respectively, described High Frequency Current Sensor and impulse ejection antenna are socketed on the cable grounding line of same working section substation respectively, after monitoring main frame captures local discharge signal, same frequency is generated but the much bigger high-frequency impulse of Amplitude Ration shelf depreciation by pulse-generating circuit, gone out by impulse ejection antenna transmission.
Described impulse output circuit is formed primarily of high speed electronic switch electronic switch K61, inductance L 61, inductance L 62, inductance L 63, electric capacity C61, electric capacity C62, electric capacity C63, electric capacity C64, resistance R61, resistance R62, resistance R63 and operational amplifier OP61; Described high speed electronic switch K61, inductance L 61, inductance L 62, inductance L 63, operational amplifier are sequentially connected in series, described resistance R61 is connected to the in-phase input end of operational amplifier, described electric capacity C64 one end ground connection, one end is connected to the inverting input of operational amplifier, described resistance R63 one end ground connection, one end is connected to the inverting input of operational amplifier, and resistance R62 is connected between the in-phase input end of operational amplifier and output terminal; Node between described operational amplifier and inductance L 63 is by resistance R64 ground connection, described inductance L 63 and flirtatiously wring out node between L62 by electric capacity C63 ground connection, node between described inductance L 62 and inductance L 61 is by resistance capacitance C62 ground connection, and the node between described high speed electronic switch K61 and inductance 61 is by electric capacity C61 ground connection.
Described pulse-generating circuit resistance all adopts precision to be per mille, the High Precision Low Temperature drift resistance that temperature coefficient is less than 10 × 10-6/ DEG C; Electric capacity all adopts that electric capacity is stable, temperature range is wide, the COG capacitor that temperature drift is little; Operational amplifier adopts high-precision meter operational amplifier, and its index at least should meet: offset voltage is 5mV, open-loop gain 100dB, bias current 10pA, effective bandwidth are 100MHz.
Described impulse ejection antenna is primarily of antenna casing, Archimedes's antenna, antenna discharge tube, differential resistance, antenna BNC connector composition, described Archimedian spiral antenna is positioned at antenna casing, antenna excitation port is drawn from antenna casing and is connected to antenna BNC connector, is connected to antenna BNC connector two ends after described differential resistance and the series connection of antenna discharge tube.
Described Archimedian spiral antenna coil is drawn on pcb board, and described pcb board uses FR4 base material, and the Archimedian spiral antenna number of turn is no more than 10 circles, and antenna equivalent capacity is no more than 100pF.
Described High Frequency Current Sensor is primarily of the sensor outer housing of pincer, magnetic core, coil, integrating resistor, passive bandpass filters, sensor discharge tube, sensor BNC connector forms, described coil winding is on magnetic core, described magnetic core is positioned at sensor outer housing, an end sensor shell of described coil is drawn and is connected with sensor BNC connector by passive bandpass filters, sensor BNC connector two ends are connected to after described integrating resistor and the series connection of sensor discharge tube, and the node between integrating resistor and sensor discharge tube is connected with the input end of passive bandpass filters.
Described passive bandpass filters is formed primarily of inductance L 41, inductance L 42, inductance L 43, inductance L 44, inductance L 45, electric capacity C41, electric capacity C42, electric capacity C43, electric capacity C44, electric capacity C45, electric capacity C46, electric capacity C47; The left end of described inductance L 41 is by electric capacity C41 ground connection; The right-hand member of described inductance L 41 and the left end of inductance L 42 are by electric capacity C42 ground connection; The right-hand member of described inductance L 42 and the left end of electric capacity C44 are by electric capacity C43 ground connection; The right-hand member of described electric capacity C44 and the left end of electric capacity C45 are by inductance L 43 ground connection, and the right-hand member of described electric capacity C45 and the left end of electric capacity C46 are by inductance L 44 ground connection, and the right-hand member of described electric capacity C46 and the left end of electric capacity C47 are by inductance L 45 ground connection.
Described high frequency signal cable is that within 45MHz, decay is less than 0.5dB/m single core coaxial cable.
Described burst transmissions circuit, analog input card, pulse amplifying circuit is enclosed in host housing, and described host housing and described sensor outer housing and antenna casing periphery are provided with insulating material, and this insulating material all adopts epoxy resin material.
After adopting this design, the present invention at least tool has the following advantages:
1, receiving coil shell of the present invention, emitting antenna shell and host housing all have dielectric level and the flame proof requirement of mine field requirement, ensure that security when user of service operates this instrument;
When 2, using the present invention to carry out field monitoring, operating personnel, at two working section substations, place a table apparatus respectively.High Frequency Current Sensor and impulse ejection antenna are socketed on cable grounding line simultaneously, by regulating monitoring main frame intellectual analysis software, i.e. the local discharge signal of detectable varying strength.After capturing local discharge signal, the amplitude of monitoring main frame automatic identification signal and frequency, then send same frequency by emitting antenna but the much bigger high-frequency impulse of Amplitude Ration shelf depreciation.The monitoring main frame at two ends all can receive this high-frequency impulse separately, thus when can complete accurate pair, then accurately can calculate high-frequency impulse velocity of propagation in the cable.By calculating transponder pulse and exomonental difference in magnitude, pulse accurately can be calculated along attenuation coefficient during cable transmission.Due to launched pulse amplitude than ground unrest and local discharge signal all much bigger, because this reducing the probability of both-end communication failure, greatly can improve the accuracy of localization of fault.After adopting above-mentioned strategy, the precision of the efficiency of personnel monitoring, shelf depreciation location and the reliability of state estimation are all greatly improved.
Accompanying drawing explanation
The above is only that the present invention program summarizes, and in order to more clearly demonstrate technological means of the present invention, elaborates to the present invention below in conjunction with accompanying drawing and embodiment.
Fig. 1 is the composition schematic diagram of a kind of mine cable partial discharge monitoring of the present invention and positioning intelligent device.
Fig. 2 is the basic composition schematic diagram of a kind of mine cable partial discharge monitoring of the present invention and positioning intelligent device High Frequency Current Sensor.
Fig. 3 is the basic composition schematic diagram of a kind of mine cable partial discharge monitoring of the present invention and positioning intelligent device impulse ejection antenna.
Fig. 4 is the basic structure schematic diagram of the present invention's a kind of mine cable partial discharge monitoring and the passive bandwidth-limited circuit of positioning intelligent device.
Fig. 5 is the basic composition schematic diagram of a kind of mine cable partial discharge monitoring and positioning intelligent device main frame.
Fig. 6 is the basic composition schematic diagram of a kind of mine cable partial discharge monitoring and positioning intelligent device impulse ejection circuit.
Fig. 7 is the schematic diagram that a kind of mine cable partial discharge monitoring of the present invention and positioning intelligent device are applied at the scene.
Embodiment
As shown in Figure 1, a kind of mine cable partial discharge monitoring and positioning intelligent device, primarily of High Frequency Current Sensor 11, impulse ejection antenna 12, high frequency signal cable 13, monitoring main frame 14 form.
As shown in Figure 2, High Frequency Current Sensor 11 is made up of the sensor outer housing 21 of pincer, magnetic core 22, coil 23, integrating resistor 24, passive bandpass filters 25, sensor discharge tube 26, sensor BNC connector 27.It is peripheral that described coil 23 is wrapped in magnetic core 22, described magnetic core 22 is arranged in sensor outer housing 21, an end sensor shell of described coil is drawn and is connected with sensor BNC connector 27 by passive bandpass filters 25, described integrating resistor 24 and sensor discharge tube 26 are connected to sensor BNC connector two ends after connecting, and the node between integrating resistor 24 and sensor discharge tube 26 is connected with the input end of passive bandpass filters 25.
As shown in Figure 3, described impulse ejection antenna 12 is primarily of antenna casing 31, Archimedes's antenna 32, antenna discharge tube 33, differential resistance 34, antenna BNC connector 35 forms, described Archimedian spiral antenna is positioned at antenna casing, described Archimedian spiral antenna coil is drawn on pcb board, described pcb board uses FR4 base material, the described Archimedian spiral antenna number of turn is no more than 10 circles, antenna equivalent capacity is no more than 100pF, antenna excitation port is drawn from antenna casing and is connected to antenna BNC connector, antenna BNC connector two ends are connected to after described differential resistance and the series connection of antenna discharge tube.
Figure 4 shows that passive bandpass filters 25, form primarily of inductance L 41, inductance L 42, inductance L 43, inductance L 44, inductance L 45, electric capacity C41, electric capacity C42, electric capacity C43, electric capacity C44, electric capacity C45, electric capacity C46, electric capacity C47.Described inductance L 41, inductance L 42, electric capacity C44, electric capacity C45, electric capacity C46, electric capacity C47 are sequentially connected in series; One end ground connection of described electric capacity C41, the other end is connected with the input end of inductance L 41; One end ground connection of described electric capacity C42, the other end is connected with the node between inductance L 41 and inductance L 42; One end ground connection of described electric capacity C43, the other end is connected with the node between inductance L 42 and electric capacity C44; One end ground connection of described inductance L 43, the other end is connected with the node between electric capacity C44 and electric capacity C45; One end ground connection of described inductance L 44, the other end is connected with the node between electric capacity C45 and electric capacity C46; One end ground connection of inductance L 45, the other end is connected with the node between electric capacity C46 and electric capacity C47.
As shown in Figure 5, monitoring main frame 14 is by host B NC joint 51, pulse amplifying circuit 52, pulse-generating circuit 53, and analog input card 54, industrial computer 55, host housing 56 form.Monitoring main frame upper end BNC connector 51 is connected to the antenna BNC connector 35 of impulse ejection antenna by single core coaxial cable, monitoring main frame lower end BNC connector is connected to the BNC connector 27 of arteries and veins High Frequency Current Sensor by single core coaxial cable.
Described industrial computer is connected with pulse-generating circuit and analog input card, described analog input card is connected with pulse amplifying circuit, during use, impulse ejection antenna and High Frequency Current Sensor is arranged on cable grounding line, regulate the Intelligent Measurement software of industrial computer, the Partial discharge signal of detectable different amplitude.After receiving Partial discharge signal, the monitoring device at two ends is respectively by monitoring main frame transponder pulse signal.By the exomonental amplitude of Intelligent adjustment, neighbourhood noise when this pulse amplitude can be made to be much higher than monitoring, thus promote the synchronous accuracy of both-end.The mistiming of two transponder pulses arrival is calculated by industrial computer intellectual analysis software, finally can accurate Calculation pulse velocity of propagation in the cable.By calculating transponder pulse and exomonental difference in magnitude, accurately can calculate pulse along attenuation coefficient during cable transmission, thus can diagnose out in cable whether shelf depreciation and location shelf depreciation occur.
Pulse-generating circuit 53 structure as shown in Figure 6, is formed primarily of high speed electronic switch electronic switch K61, inductance L 61, inductance L 62, inductance L 63, electric capacity C61, electric capacity C62, electric capacity C63, electric capacity C64, resistance R61, resistance R62, resistance R63 and operational amplifier OP61.Described high speed electronic switch electronic switch K61, inductance L 61, inductance L 62, inductance L 63 are sequentially connected in series, described in, one end ground connection of electric capacity C61, the other end is connected on the node between high speed electronic switch electronic switch K61 and inductance L 61; One end ground connection of described electric capacity C62, the other end is connected on the node between inductance L 61 and inductance L 62; One end ground connection of described electric capacity C63, the other end is connected on the node between inductance L 62 and inductance L 63; One end of described inductance L 63 is connected with inductance L 62, the other end is connected to the output terminal of operational amplifier OP61, resistance R61 is connected to the in-phase input end of operational amplifier, one end of resistance R62 is connected to the in-phase input end of operational amplifier, the other end is connected to the output terminal of operational amplifier, the annexation of described electric capacity C64 and resistance R63 is: one end ground connection, the other end is connected to the reverse input end of operational amplifier, one end ground connection of described resistance R64, the other end is connected on the node between inductance L 63 and the output terminal of operational amplifier.
Sensor outer housing 21, antenna casing 31, host housing 56 all adopts epoxy resin insulation material.
The analysis software comprised in monitoring main frame, groundwork can be divided into two modules.First module can the noise amplitude that arrives of intelligent decision Site Detection and frequency, according to on-the-spot noise level, launches the high-frequency pulse signal of different amplitude and frequency.Second module extracts transponder pulse and exomonental mistiming and transponder pulse and exomonental difference in magnitude.As shown in Figure 7, in this figure, tested cable is the cable between cable 72 and cable 73 to field monitoring schematic diagram, is formed by connecting by intermediate head by multistage cable.Place a set of device of the present invention at working section substation A, impulse ejection coil and High Frequency Current Sensor are installed on cable grounding line 71 simultaneously.Also place a set of device of the present invention at working section substation B, impulse ejection coil and High Frequency Current Sensor are installed on cable grounding line 74 simultaneously.After the High Frequency Current Sensor at two ends receives pulse, amplitude and the high-frequency pulse signal of frequency after intelligent software is optimized can be launched simultaneously.The two ends high-frequency signals launched can be analyzed by the monitoring main frame collection in each exploiting field respectively simultaneously.The speed of pulse along cable distribution can be calculated according to the mistiming of measuring-signal, thus the trouble spot of local discharge signal can be located.Meanwhile, because launched pulse amplitude is much bigger compared with background interference, avoid device by frequent false triggering.
Visible, the present invention is at mine Test Field, by High Frequency Current Sensor and the associated working of impulse ejection antenna, produce the high-frequency pulse signal of frequency and variable-magnitude by monitoring main frame intelligent software automatic decision, the monitoring device at two ends is made to receive the pulse signal more much bigger than ground unrest, avoid two end devices by false triggering, improve the success ratio of monitoring.The monitoring device at working section substation two ends after accurate communication, just by software Obtaining Accurate high-frequency pulse signal along the speed of cable distribution and attenuation coefficient.When after the velocity of propagation obtaining high-frequency impulse and attenuation coefficient, just accurately can estimate cable insulation fault degree and accurate fault point, obviously, device of the present invention can improve monitoring effect and work efficiency.
The above; it is only preferred embodiment of the present invention; not do any pro forma restriction to the present invention, those skilled in the art utilize the technology contents of above-mentioned announcement to make a little simple modification, equivalent variations or modification, all drop in protection scope of the present invention.
Claims (7)
1. a mine cable partial discharge monitoring and positioning intelligent device, it is characterized in that: primarily of High Frequency Current Sensor (11), impulse ejection antenna (12), high frequency signal cable (13) and monitoring main frame (14) composition, described High Frequency Current Sensor (11) is connected with monitoring main frame (14) by high frequency signal cable (13), described impulse ejection antenna (12) is connected with monitoring main frame by high frequency signal cable (13), described monitoring main frame comprises pulse amplifying circuit (52), analog input card (54), pulse-generating circuit (53) and industrial computer (55), two working section substations install a described on-line monitoring and positioning intelligent device respectively, described High Frequency Current Sensor (11) and impulse ejection antenna (12) are socketed on the cable grounding line of same working section substation respectively, after monitoring main frame (14) captures local discharge signal, generate same frequency but the much bigger high-frequency impulse of Amplitude Ration shelf depreciation by pulse-generating circuit, launched by impulse ejection antenna (12),
Described pulse-generating circuit (53) is primarily of high speed electronic switch K61, inductance L 61, inductance L 62, inductance L 63, electric capacity C61, electric capacity C62, electric capacity C63, electric capacity C64, resistance R61, resistance R62, resistance R63 and operational amplifier OP61 is formed, described high speed electronic switch K61, inductance L 61, inductance L 62, inductance L 63, operational amplifier is sequentially connected in series, described resistance R61 is connected to the in-phase input end of operational amplifier, described electric capacity C64 one end ground connection, one end is connected to the inverting input of operational amplifier, described resistance R63 one end ground connection, one end is connected to the inverting input of operational amplifier, resistance R62 is connected between the in-phase input end of operational amplifier and output terminal, node between described operational amplifier and inductance L 63 is by resistance R64 ground connection, node between described inductance L 63 and inductance L 62 is by electric capacity C63 ground connection, node between described inductance L 62 and inductance L 61 is by electric capacity C62 ground connection, and the node between described high speed electronic switch K61 and inductance L 61 is by electric capacity C61 ground connection,
Described High Frequency Current Sensor (12) is primarily of the sensor outer housing (21) of pincer, magnetic core (22), coil (23), integrating resistor (24), passive bandpass filters (25), sensor discharge tube (26), sensor BNC connector (27) forms, described coil winding is on magnetic core, described magnetic core is positioned at shell, an end sensor shell of described coil is drawn and is passed through passive bandpass filters (25) and is connected with sensor BNC connector (27), sensor BNC connector two ends are connected to after described integrating resistor (24) and sensor discharge tube (26) series connection, and the node between integrating resistor (24) and sensor discharge tube (26) is connected with the input end of passive bandpass filters (25).
2. a kind of mine cable partial discharge monitoring as claimed in claim 1 and positioning intelligent device, is characterized in that: the resistance of described pulse-generating circuit all adopts the High Precision Low Temperature drift resistance that precision is per mille, temperature coefficient is less than 10 × 10-6/ DEG C; Electric capacity all adopts the COG capacitor that electric capacity is stablized, temperature range is wide, temperature drift is little; Operational amplifier adopts high-precision meter operational amplifier, and its index at least should meet: offset voltage is 5mV, open-loop gain 100dB, bias current 10pA, effective bandwidth are 100MHz.
3. a kind of mine cable partial discharge monitoring according to claim 1 and positioning intelligent device, it is characterized in that: described impulse ejection antenna (12) is primarily of antenna casing (31), Archimedian spiral antenna (32), antenna discharge tube (33), differential resistance (34), antenna BNC connector (35) forms, described Archimedian spiral antenna is positioned at antenna casing, antenna excitation port is drawn from antenna casing and is connected to antenna BNC connector (35), antenna BNC connector two ends are connected to after described differential resistance (34) and antenna discharge tube (33) series connection.
4. a kind of mine cable partial discharge monitoring as claimed in claim 3 and positioning intelligent device, it is characterized in that: described Archimedian spiral antenna coil is drawn on pcb board, described pcb board uses FR4 base material, the Archimedian spiral antenna number of turn is no more than 10 circles, and antenna equivalent capacity is no more than 100pF.
5. a kind of mine cable partial discharge monitoring according to claim 1 and positioning intelligent device, is characterized in that: described passive bandpass filters (25) is formed primarily of inductance L 41, inductance L 42, inductance L 43, inductance L 44, inductance L 45, electric capacity C41, electric capacity C42, electric capacity C43, electric capacity C44, electric capacity C45, electric capacity C46, electric capacity C47; The left end of described inductance L 41 is by electric capacity C41 ground connection; The right-hand member of described inductance L 41 and the left end of inductance L 42 are by electric capacity C42 ground connection; The right-hand member of described inductance L 42 and the left end of electric capacity C44 are by electric capacity C43 ground connection; The right-hand member of described electric capacity C44 and the left end of electric capacity C45 are by inductance L 43 ground connection, and the right-hand member of described electric capacity C45 and the left end of electric capacity C46 are by inductance L 44 ground connection, and the right-hand member of described electric capacity C46 and the left end of electric capacity C47 are by inductance L 45 ground connection.
6. according to a kind of mine cable partial discharge monitoring in claim 1-5 described in any one and positioning intelligent device, it is characterized in that: described pulse-generating circuit (53), pulse amplifying circuit (52) and industrial computer (55) are enclosed in host housing (56), described host housing (56) and described sensor outer housing (21) are provided with insulating material with antenna casing (31) periphery, and this insulating material all adopts epoxy resin material.
7. according to a kind of mine cable partial discharge monitoring in claim 1-5 described in any one and positioning intelligent device, it is characterized in that: described high frequency signal cable is that within 45MHz, decay is less than 0.5dB/m single core coaxial cable.
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| XLPE电力电缆中局部放电检测及定位技术的研究现状;郭灿新等;《高压电器》;20090630;第45卷(第3期);正文第59页右栏倒数第1-2段，第60页左栏第1段，图11 * |
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Application publication date: 20130220 Assignee: Shandong Ronglida Mining Electrical Appliance Equipment Co.,Ltd. Assignor: Xi'an Jiaotong University Contract record no.: 2013370000102 Denomination of invention: Intelligent mine cable partial discharge on-line monitoring and positioning device License type: Exclusive License Record date: 20130503 |
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