CN102937691A - Intelligent mine cable partial discharge on-line monitoring and positioning device - Google Patents
Intelligent mine cable partial discharge on-line monitoring and positioning device Download PDFInfo
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- CN102937691A CN102937691A CN2012104419636A CN201210441963A CN102937691A CN 102937691 A CN102937691 A CN 102937691A CN 2012104419636 A CN2012104419636 A CN 2012104419636A CN 201210441963 A CN201210441963 A CN 201210441963A CN 102937691 A CN102937691 A CN 102937691A
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Abstract
The invention relates to an intelligent mine cable partial discharge on-line monitoring and positioning device which is mainly composed of a high-frequency current sensor, an impulse transmitting antenna, a high-frequency signal cable and a main monitoring machine. The intelligent mine cable partial discharge on-line monitoring and positioning device is respectively placed at the end of a cable ground wire in substation in two mining fields during field detection. The impulse transmitting antenna is connected with the main monitoring machine through the high-frequency signal cable, the main monitoring machine controls an impulse transmitting circuit to generate high-frequency impulse signals with changeable amplitude values and frequencies, and the high-frequency impulse signals are coupled to a detected cable through the impulse transmitting antenna. The high-frequency current sensor is connected with the main monitoring machine through the high-frequency signal cable, a coil detects and receives the high-frequency impulse signals in the cable, the main monitoring machine can immediately transmit a high-frequency impulse when the high-frequency impulse signals are detected, and an amplitude value and an frequency of the transmitted impulse are identical to those of a receiving impulse. By means of the process, accurate clock synchronization at two ends of the cable is finished, and the purpose of accurately positioning cable partial discharge points is achieved.
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
The insulation state monitoring of power cable, analysis and localization of fault are the important contents of mine electric power equipment Inspection in the mine, also are for guaranteeing the necessary monitoring means of mine safety.This year, urban distribution network administrative authority is by installing in short-term or for a long time the pulse current that ground wire is flow through in the High Frequency Current Sensor measurement at power cable ground wire place, the intensity of analysis shelf depreciation and frequency, monitoring power cable state of insulation are obtained preferably practice effect.But also exist some technical matterss not yet to solve, strong background noise disturbs when mainly containing on-line monitoring, and the high-frequency impulse velocity of propagation is estimated inaccurate, and attenuation factor was difficult to determine when high-frequency impulse was propagated, the poor effect that causes insulation state monitoring, it is often wrong that point location is put in office.On the other hand, these advanced detection techniques are not used in the middle of the safety detection of mine power equipment, can't promote the malfunction monitoring of power equipment in the mine and the technical merit of localization of fault.
For cable insulation status monitoring and localization of fault in the mine, the main difficulty that faces at present has following several aspect:
At first, the ground unrest interference problem: under the on-line monitoring environment, a lot of outside strong electromagnetic can be passed through grounded screen, grounding copper bar, the propagation of cable grounding alignment electrical network, and these strong jammings usually discharge signal than actual are large, signal to noise ratio (S/N ratio) when causing detecting is very low, and Partial discharge signal is difficult to extract.Also cause simultaneously the emitter false triggering of fault location system, the localization of fault difficulty strengthens, the localization of fault inefficiency.
Secondly, it also is the important problem that cable insulation state on_line monitoring and fault location system face that high-frequency impulse velocity of propagation in cable is difficult for accurate estimation.Currently achieved system, the velocity of propagation of using during localization of fault is generally got empirical value, and supposes that this velocity of propagation all remains unchanged in the various situations, and this often is not inconsistent with actual conditions, causes positioning error larger, and fault handling is wasted time and energy.
Therefore, design a kind of safe, portable, efficient cable insulation status monitoring and fault locator, solve the problem of mine cable partial discharge monitoring and location, guarantee the safe operation of mine power equipment, be 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, have the characteristics such as safe, portable, flexible and accurate, can solve to a great extent the problems such as current mining power cable state of insulation on-line monitoring and fault location system detection sensitivity are low, localization of fault efficient is not high, promote the technical merit of association area, remedied monitoring technology deficiency in actual applications.
A kind of mine cable partial discharge monitoring of the present invention and positioning intelligent device, mainly by High Frequency Current Sensor, the impulse ejection antenna, high frequency signal cable and monitoring main frame form, described High Frequency Current Sensor links to each other with the monitoring main frame by high frequency signal cable, described impulse ejection antenna links to each other with the 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 are installed respectively a described on-line monitoring and positioning intelligent device, described High Frequency Current Sensor and impulse ejection antenna are socketed in respectively on the cable grounding line of same working section substation, after the monitoring main frame captures local discharge signal, generate same frequency but the amplitude high-frequency impulse more much bigger than shelf depreciation gone out by the impulse ejection antenna transmission by pulse-generating circuit.
Described impulse output circuit mainly is made of with operational amplifier OP61 high speed electronic switch electronic switch K61, inductance L 61, inductance L 62, inductance L 63, capacitor C 61, capacitor C 62, capacitor C 63, capacitor C 64, resistance R 61, resistance R 62, resistance R 63; Described high speed electronic switch K61, inductance L 61, inductance L 62, inductance L 63, operational amplifier are connected in series successively, described resistance R 61 is connected to the in-phase input end of operational amplifier, described capacitor C 64 1 end ground connection, one end is connected to the inverting input of operational amplifier, described resistance R 63 1 end ground connection, one end is connected to the inverting input of operational amplifier, and resistance R 62 is connected between the in-phase input end and output terminal of operational amplifier; Node between described operational amplifier and the inductance L 63 is by resistance R 64 ground connection, described inductance L 63 and the flirtatious node of wringing out between the L62 pass through capacitor C 63 ground connection, node between described inductance L 62 and the inductance L 61 is by resistance capacitance C62 ground connection, and the node between described high speed electronic switch K61 and the inductance 61 is by capacitor C 61 ground connection.
It is per mille that described pulse-generating circuit resistance all adopts precision, and temperature coefficient floats resistance less than 10 * 10-6/ ℃ High Precision Low Temperature; Electric capacity adopts all that electric capacity is stable, temperature range is wide, and temperature is floated little COG capacitor; Operational amplifier adopts the high-precision meter operational amplifier, and its index should satisfy at least: offset voltage is that 5mV, open-loop gain 100dB, bias current 10pA, effective bandwidth are 100MHz.
Described impulse ejection antenna mainly is comprised of antenna casing, Archimedes's antenna, antenna discharge tube, differential resistance, antenna BNC connector, described Archimedian spiral antenna is positioned at antenna casing, the antenna BNC connector is drawn and be connected to the antenna excitation port from antenna casing, 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 the pcb board, and described pcb board uses the FR4 base material, and the Archimedian spiral antenna number of turn is no more than 10 circles, and the antenna equivalent capacity is no more than 100pF.
Described High Frequency Current Sensor is mainly by the sensor outer housing of pincer, magnetic core, coil, integrating resistor, passive bandpass filters, the sensor discharge tube, the sensor BNC connector forms, described coil winding is on magnetic core, described magnetic core is positioned at sensor outer housing, an end autobiography sensor shell of described coil is drawn and is connected with the sensor BNC connector by passive bandpass filters, be connected to sensor BNC connector two ends after described integrating resistor and the series connection of sensor discharge tube, and the node between integrating resistor and the sensor discharge tube links to each other with the input end of passive bandpass filters.
Described passive bandpass filters mainly is made of inductance L 41, inductance L 42, inductance L 43, inductance L 44, inductance L 45, capacitor C 41, capacitor C 42, capacitor C 43, capacitor C 44, capacitor C 45, capacitor C 46, capacitor C 47; The left end of described inductance L 41 is by capacitor C 41 ground connection; The left end of the right-hand member of described inductance L 41 and inductance L 42 is by capacitor C 42 ground connection; The left end of the right-hand member of described inductance L 42 and capacitor C 44 is by capacitor C 43 ground connection; The left end of the right-hand member of described capacitor C 44 and capacitor C 45 is by inductance L 43 ground connection, and the left end of the right-hand member of described capacitor C 45 and capacitor C 46 is by inductance L 44 ground connection, and the left end of the right-hand member of described capacitor C 46 and capacitor C 47 is by inductance L 45 ground connection.
Described high frequency signal cable be 45MHz with interior decay less than the 0.5dB/m single core coaxial cable.
Described burst transmissions circuit, analog input card, pulse amplifying circuit are enclosed in the 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 the epoxy resin material.
After adopting this design, the present invention has following advantage at least:
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, have guaranteed the security the when user of service operates this instrument;
When 2, using the present invention to carry out field monitoring, operating personnel place respectively a table apparatus at two working section substations.High Frequency Current Sensor and impulse ejection antenna are socketed on the cable grounding line simultaneously, by regulating monitoring main frame intellectual analysis software, the i.e. local discharge signal of detectable varying strength.After capturing local discharge signal, then amplitude and the frequency of the automatic identification signal of monitoring main frame send same frequency but the amplitude high-frequency impulse more much bigger than shelf depreciation by emitting antenna.The monitoring main frame at two ends all can receive this high-frequency impulse separately, thus can finish accurately to the time, then can accurately calculate the velocity of propagation of high-frequency impulse in cable.By calculating transponder pulse and exomonental difference in magnitude, the attenuation coefficient in the time of can accurately calculating the pulse edge cable transmission.Because the pulse amplitude of launching is all more much bigger than ground unrest and local discharge signal, therefore reduced the probability of both-end communication failure, can greatly improve the accuracy of localization of fault.After adopting above-mentioned strategy, personnel monitoring's efficient, the precision of shelf depreciation location and the reliability of state estimation all are greatly improved.
Description of drawings
The above only is that the present invention program summarizes, and in order more to clearly demonstrate technological means of the present invention, below in conjunction with accompanying drawing and embodiment the present invention is elaborated.
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 a kind of mine cable partial discharge monitoring of the present invention 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 used at the scene.
Embodiment
As shown in Figure 1, a kind of mine cable partial discharge monitoring and positioning intelligent device, mainly by 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 comprised of sensor outer housing 21, magnetic core 22, coil 23, integrating resistor 24, passive bandpass filters 25, sensor discharge tube 26, the sensor BNC connector 27 of pincer.Described coil 23 is wrapped in magnetic core 22 peripheries, described magnetic core 22 is arranged in the sensor outer housing 21, an end autobiography sensor shell of described coil is drawn and is connected with sensor BNC connector 27 by passive bandpass filters 25, be connected to sensor BNC connector two ends after described integrating resistor 24 and 26 series connection of sensor discharge tube, and the node between integrating resistor 24 and the sensor discharge tube 26 links to each other with the input end of passive bandpass filters 25.
As shown in Figure 3, described impulse ejection antenna 12 is mainly by 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 the pcb board, described pcb board uses the FR4 base material, the described Archimedian spiral antenna number of turn is no more than 10 circles, the antenna equivalent capacity is no more than 100pF, the antenna BNC connector is drawn and be connected to the antenna excitation port from antenna casing, is connected to antenna BNC connector two ends after described differential resistance and the series connection of antenna discharge tube.
Figure 4 shows that passive bandpass filters 25, mainly consisted of by inductance L 41, inductance L 42, inductance L 43, inductance L 44, inductance L 45, capacitor C 41, capacitor C 42, capacitor C 43, capacitor C 44, capacitor C 45, capacitor C 46, capacitor C 47.Described inductance L 41, inductance L 42, capacitor C 44, capacitor C 45, capacitor C 46, capacitor C 47 are connected in series successively; One end ground connection of described capacitor C 41, the other end links to each other with the input end of inductance L 41; One end ground connection of described capacitor C 42, the other end links to each other with node between inductance L 41 and the inductance L 42; One end ground connection of described capacitor C 43, the other end links to each other with node between inductance L 42 and the capacitor C 44; One end ground connection of described inductance L 43, the other end links to each other with node between capacitor C 44 and the capacitor C 45; One end ground connection of described inductance L 44, the other end links to each other with node between capacitor C 45 and the capacitor C 46; One end ground connection of inductance L 45, the other end links to each other with node between capacitor C 46 and the capacitor C 47.
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 links to each other with pulse-generating circuit and analog input card, described analog input card links to each other with pulse amplifying circuit, during use, impulse ejection antenna and High Frequency Current Sensor is installed on the cable grounding line, regulate the Intelligent Measurement software of industrial computer, the Partial discharge signal of detectable different amplitudes.After receiving Partial discharge signal, the monitoring device at two ends is respectively by monitoring main frame transponder pulse signal.Regulate exomonental amplitude by intelligence, can be so that this pulse amplitude be much higher than the neighbourhood noise in when monitoring, thus promote the synchronous accuracy of both-end.Calculate the mistiming that two transponder pulses arrive by industrial computer intellectual analysis software, but the final velocity of propagation of accurate Calculation pulse in cable.By calculating transponder pulse and exomonental difference in magnitude, whether the attenuation coefficient in the time of can accurately calculating the pulse edge cable transmission shelf depreciation occurs in the cable and locates shelf depreciation thereby can diagnose out.
Pulse-generating circuit 53 structures mainly are made of with operational amplifier OP61 high speed electronic switch electronic switch K61, inductance L 61, inductance L 62, inductance L 63, capacitor C 61, capacitor C 62, capacitor C 63, capacitor C 64, resistance R 61, resistance R 62, resistance R 63 as shown in Figure 6.Described high speed electronic switch electronic switch K61, inductance L 61, inductance L 62, inductance L 63 are connected in series successively, and be described, an end ground connection of capacitor C 61, and the other end is connected on the node between high speed electronic switch electronic switch K61 and the inductance L 61; One end ground connection of described capacitor C 62, the other end are connected on the node between inductance L 61 and the inductance L 62; One end ground connection of described capacitor C 63, the other end are connected on the node between inductance L 62 and the inductance L 63; One end of described inductance L 63 links to each other with inductance L 62, the other end is connected to the output terminal of operational amplifier OP61, resistance R 61 is connected to the in-phase input end of operational amplifier, one end of resistance R 62 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 capacitor C 64 and resistance R 63 is: an end ground connection, the other end is connected to the reverse input end of operational amplifier, one end ground connection of described resistance R 64, the other end are connected on the node between the output terminal of inductance L 63 and operational amplifier.
Sensor outer housing 21, antenna casing 31, host housing 56 all adopts epoxy resin insulation material.
The analysis software that comprises in the monitoring main frame, groundwork can be divided into two modules.But noise amplitude and frequency that first module intelligent decision Site Detection arrives according to on-the-spot noise level, are launched the high-frequency pulse signal of different amplitudes and frequency.Second module extracted transponder pulse and exomonental mistiming and transponder pulse and exomonental difference in magnitude.The field monitoring schematic diagram as shown in Figure 7, tested cable is the cable between cable 72 and the cable 73 among this figure, is formed by connecting by intermediate head by the multistage cable.Place cover device of the present invention at working section substation A, impulse ejection coil and High Frequency Current Sensor are installed on the cable grounding line 71 simultaneously.Also place cover device of the present invention at working section substation B, impulse ejection coil and High Frequency Current Sensor are installed on the cable grounding line 74 simultaneously.After the High Frequency Current Sensor at two ends receives pulse, can launch simultaneously the high-frequency pulse signal after amplitude and frequency are optimized through intelligent software.The high-frequency signal of two ends emission can be distinguished simultaneously by the collection of the monitoring main frame in each exploiting field and analysis.Mistiming according to measuring-signal can calculate the speed that the pulse edge cable is propagated, thereby can locate the trouble spot of local discharge signal.Simultaneously, because the pulse amplitude of launching is much bigger than background interference, avoided device by frequent false triggering.
As seen, the present invention is at the mine Test Field, with High Frequency Current Sensor and the associated working of impulse ejection antenna, by monitoring main frame intelligence software automatic decision and producing frequency and the high-frequency pulse signal of variable-magnitude, so that the monitoring device at two ends receives the pulse signal more much bigger than ground unrest, avoid two end devices by false triggering, improved the success ratio of monitoring.The monitoring device at working section substation two ends just can be by speed and the attenuation coefficient of software Obtaining Accurate high-frequency pulse signal along the cable propagation after accurately communicating by letter.Behind the velocity of propagation of having obtained high-frequency impulse and attenuation coefficient, just can accurately estimate the cable insulation fault degree and accurately locate the trouble spot, apparent, device of the present invention can improve monitoring effect and work efficiency.
The above; it only is preferred embodiment of the present invention; be not that the present invention is done any pro forma restriction, 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 (9)
1. a mine cable partial discharge monitoring and positioning intelligent device, it is characterized in that: mainly by High Frequency Current Sensor (11), impulse ejection antenna (12), high frequency signal cable (13) and monitoring main frame (14) form, described High Frequency Current Sensor (11) links to each other with monitoring main frame (14) by high frequency signal cable (13), described impulse ejection antenna (12) links to each other with the 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 are installed respectively a described on-line monitoring and positioning intelligent device, described High Frequency Current Sensor (11) and impulse ejection antenna (12) are socketed in respectively on the cable grounding line of same working section substation, after monitoring main frame (14) captures local discharge signal, generate same frequency but the amplitude high-frequency impulse more much bigger than shelf depreciation launched by impulse ejection antenna (12) by pulse-generating circuit.
2. a kind of mine cable partial discharge monitoring as claimed in claim 1 and positioning intelligent device, it is characterized in that: described pulse-generating circuit (53) is mainly by high speed electronic switch K61, inductance L 61, inductance L 62, inductance L 63, capacitor C 61, capacitor C 62, capacitor C 63, capacitor C 64, resistance R 61, resistance R 62, resistance R 63 consists of with operational amplifier OP61, described high speed electronic switch K61, inductance L 61, inductance L 62, inductance L 63, operational amplifier is connected in series successively, described resistance R 61 is connected to the in-phase input end of operational amplifier, described capacitor C 64 1 end ground connection, one end is connected to the inverting input of operational amplifier, described resistance R 63 1 end ground connection, one end is connected to the inverting input of operational amplifier, and resistance R 62 is connected between the in-phase input end and output terminal of operational amplifier; Node between described operational amplifier and the inductance L 63 is by resistance R 64 ground connection, node between described inductance L 63 and the inductance L 62 is by capacitor C 63 ground connection, node between described inductance L 62 and the inductance L 61 is by resistance capacitance C62 ground connection, and the node between described high speed electronic switch K61 and the inductance 61 is by capacitor C 61 ground connection.
3. a kind of mine cable partial discharge monitoring as claimed in claim 2 and positioning intelligent device, it is characterized in that: it is per mille that the resistance of described pulse-generating circuit all adopts precision, and temperature coefficient is less than 10 * 10
-6/ ℃ High Precision Low Temperature float resistance; Electric capacity adopts all that electric capacity is stable, temperature range is wide, and temperature is floated little COG capacitor; Operational amplifier adopts the high-precision meter operational amplifier, and its index should satisfy at least: offset voltage is that 5mV, open-loop gain 100dB, bias current 10pA, effective bandwidth are 100MHz.
4. a kind of mine cable partial discharge monitoring according to claim 1 and positioning intelligent device, it is characterized in that: the main sensor outer housing (21) by pincer of described High Frequency Current Sensor (12), 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 autobiography sensor shell of described coil is drawn and is connected with sensor BNC connector (27) by passive bandpass filters (25), be connected to sensor BNC connector two ends after described integrating resistor (24) and sensor discharge tube (26) series connection, and the node between integrating resistor (24) and the sensor discharge tube (26) links to each other with the input end of passive bandpass filters (25).
5. 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 (11) is mainly by 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 BNC connector (35) is drawn and be connected to the antenna excitation port from antenna casing, is connected to antenna BNC connector two ends after described differential resistance (34) and antenna discharge tube (33) series connection.
6. a kind of mine cable partial discharge monitoring as claimed in claim 5 and positioning intelligent device, it is characterized in that: described Archimedian spiral antenna coil is drawn on the pcb board, described pcb board uses the FR4 base material, the Archimedian spiral antenna number of turn is no more than 10 circles, and the antenna equivalent capacity is no more than 100pF.
7. a kind of mine cable partial discharge monitoring according to claim 1 and positioning intelligent device, it is characterized in that: described passive bandpass filters (25) mainly is made of inductance L 41, inductance L 42, inductance L 43, inductance L 44, inductance L 45, capacitor C 41, capacitor C 42, capacitor C 43, capacitor C 44, capacitor C 45, capacitor C 46, capacitor C 47; The left end of described inductance L 41 is by capacitor C 41 ground connection; The left end of the right-hand member of described inductance L 41 and inductance L 42 is by capacitor C 42 ground connection; The left end of the right-hand member of described inductance L 42 and capacitor C 44 is by capacitor C 43 ground connection; The left end of the right-hand member of described capacitor C 44 and capacitor C 45 is by inductance L 43 ground connection, and the left end of the right-hand member of described capacitor C 45 and capacitor C 46 is by inductance L 44 ground connection, and the left end of the right-hand member of described capacitor C 46 and capacitor C 47 is by inductance L 45 ground connection.
8. the described a kind of mine cable partial discharge monitoring of any one and positioning intelligent device according to claim 1-7, it is characterized in that: described pulse-generating circuit (53), pulse amplifying circuit (52) are enclosed in the host housing (56) with industrial computer (55), 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 the epoxy resin material.
9. the described a kind of mine cable partial discharge monitoring of any one and positioning intelligent device according to claim 1-7 is characterized in that: described high frequency signal cable be 45MHz with interior decay less than the 0.5dB/m single core coaxial cable.
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