CN104459237A - Signal generator for cable recognition device - Google Patents
Signal generator for cable recognition device Download PDFInfo
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- CN104459237A CN104459237A CN201410784496.6A CN201410784496A CN104459237A CN 104459237 A CN104459237 A CN 104459237A CN 201410784496 A CN201410784496 A CN 201410784496A CN 104459237 A CN104459237 A CN 104459237A
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Abstract
The invention discloses a signal generator for a cable recognition device. The signal generator comprises a power module, a high-voltage transforming unit and a discharge control unit. The high-voltage transforming unit comprises an electronic pulse generating module, a voltage detecting circuit connected to the electronic pulse generating module in parallel, and a pulse capacitor. The discharge control unit comprises a time relay, a direct-current electromagnet and a mechanical periodic discharge switch connected to the output end of the pulse capacitor, wherein the time relay and the direct-current electromagnet are used for controlling the periodic discharge of a cable. A low-voltage direct-current power source provided by the power module passes through the discharge control unit and then enters the electronic pulse generating module, direct-current high voltages are directly output, the voltage detecting circuit is used for detecting the output values of the direct-current high voltages in real time, the output direct-current high voltages are used for charging the pulse capacitor and providing energy for discharge of the cable, and then discharge is conducted on the cable through the discharge control unit regularly. The signal generator has the advantages of being high in anti-interference performance and applicability, small in size and the like.
Description
Technical field
The present invention relates to a kind of signal generator for cable identification device, belong to cable recognition technology field.
Background technology
Along with urban economy is fast-developing and the raising of life of urban resident quality, the requirement of people to living environment and appearance of city is also more and more higher.Power cable is powered due to its safety, reliably, is conducive to the advantage such as beautifying city and factories and miness layout, cable is made to become a kind of trend of New Times new century, it produces brand-new realistic effect to beautifying urban environment and lifting city function, obtains and applies more and more widely.The fast development of urban economy, need for electricity also increases substantially, and makes cable rush to repair operation and cable and moves and change engineering and also get more and more.Change and rush to repair in operation moving, be often many different cross-sectional in cable duct or excavation region, the cable of different brackets lays side by side, needing to distinguish which bar is the cable that this task will be found, and this work is referred to as cable identification.According to the requirement of " electric power safety working regulation " 10.2.1.9 bar, cable identification work relates to the person and device security, and the reliability of identification result is extremely important, and necessary 100% accurately and reliably.
The classic method of cable identification checks drawing, and manual site examines, but the drawing of cable laying usually inadequate specification, detailed not, even lose damage, bury the change disappearance of environment and marker in addition underground, be difficult to find target cable.
The main cable identifier that relies on carries out cable identification at present.The identifier device of Present Domestic Wai Ge producer is with the typical case the most of SEBAKMT and BAUR company.Although most of identifier Realization of Product circuit structure and technical parameter all have difference, but its principle of work is roughly the same, mainly contain pulse polarity method (direction of current method, the most universal at present) and frequency induction method two kinds (mainly carrying out in conjunction with cable trace detection operation).Namely a signal is added with transmitter from target cable head end, this signal has the characteristic quantity with the power current voltage signal significant difference running cable, the time of launching as the size of the shape of sense of current, signal, amplitude, signal and cycle and duration etc., then detect the characteristic quantity of observation signal on each bar cable need differentiating place with receiver on request, thus determine this target cable.
Find in actual job, the most universal all kinds of cable identifiers of current use are meeting under the disturbed conditions such as strong induced electricity, usually cause judging or apply the situation that signal is more difficult, even damage identification instrument by accident, this moves to change to cable and brings great security risk with breakdown repair work.The analysis found that, domestic many cities and area due in order to easy construction or cable passage nervous, many mesolow cables and EHV XLPE power cable use same channels to lay, polycore cable and single core cable mixing are laid, and the objective environment of high water stage often causes cable sheath multipoint earthing in a part of cable passage, when have a power failure tested cable and same passage run cable lay in the same way longer or different cable grounding resistance difference larger, often cause and induce stronger induction current or voltage on power failure cable line; In addition; due to the revision of new edition design specifications, the sheath induced voltage of original single core cable, under the prerequisite having insulation protection, has brought up to 300V from 50V; while obtaining the advantage that cable length is elongated, intermediate head tails off, single-ended cable sheath induced voltage improves greatly.
The cable identifier of current use is in order to reach the safe and reliable performance taking into account small in volume, signal generator adopts middle low power, and the current signal amplitude added is by the impact of different cable grounding resistance, often cause the pulse signal that induced electricity severe jamming signal generator applies, after induced electricity reaches certain numerical value, the automatic protection act of superpotential of instrument, thus cause signal to apply difficulty, part home products is without over-voltage protection module, the fault that even occurring smolders burns out, this is also one of reason being unfavorable for that the current digital miniwatt cable identifier generally used cannot normally work, thus greatly have impact on cable repairing and road move the on-the-spot efficiency changing the work such as engineering.
And no matter be domestic or external import instrument, receiving instrument and probe are comparatively large, are not too applicable to the application of test site, as cable shaft ditch, narrow space, receiving instrument is transferred to other use comparatively difficult, is sometimes even difficult to instrument to carry into Jing Gou; The cable discharge of laying at present is comparatively tight, and the distance between cable and space are too little, cannot be placed in therebetween by probe or clamp, directly affects carrying out smoothly of test.
So it is reliable and stable that the uniqueness of cable differentiates to be badly in need of a kind of recognition performance, volume is little, lightweight, be convenient to receiving trap, particularly probe segment that tester carries with, and given volume will be applicable to the test request of close-packed arrays cable.
In view of this, the present inventor studies this, and develop a kind of signal generator for cable identification device specially, this case produces thus.
Summary of the invention
The object of this invention is to provide a kind of signal generator for cable identification device, the rugged surroundings such as strong induced electricity, AC-less power can be adapted to completely, and be easy to carry.
To achieve these goals, solution of the present invention is:
A kind of signal generator for cable identification device, comprise power module, high-voltage transformation unit and control of discharge unit, described high-voltage transformation unit comprises electronic impulse generation module, be connected in parallel on the voltage detecting circuit in electronic impulse generation module and pulsed capacitance, described control of discharge unit comprises the time relay, DC electromagnet for controlling to carry out cable periodic discharge, and is connected to the mechanical type periodic discharging switch of pulsed capacitance output terminal; The low-voltage dc power supply that described power module provides enters electronic impulse generation module after control of discharge unit, direct output high direct voltage, voltage detecting circuit detects high direct voltage output valve in real time, the high direct voltage exported is pulsed capacitance charging, the energy of cable discharge is provided, then by the timing of control of discharge unit, cable is discharged.
As preferably, described control of discharge unit comprises the mechanical type ground connection discharge switch being connected in parallel on pulsed capacitance two ends further, and when cable induction voltage to be identified exceeds gap breakdown voltage, ground connection discharge switch is breakdown, over the ground discharge prevention signal generator; When signal generator power-off or accident power-off, the action of ground connection discharge switch, pulsed capacitance shorted to earth, release store electrical energy, prevents signal generator from exporting charged.
As preferably, described control of discharge unit is primarily of 2 groups of time relays, 2 groups of DC electromagnets, 1 mechanical type periodic discharging switch, 1 mechanical type ground connection discharge switch, and moving electrode and stationary electrode are formed, in DC electromagnet, iron staff connects moving electrode, stationary electrode is connected to signal generator output terminal, DC electromagnet is connected with power module, the time relay controls the on/off of DC electromagnet, direct solenoid railway traction moving electrode, when DC electromagnet power supply disconnects, DC electromagnet is affected by gravity and falls, dynamic copper electrode contacts with quiet copper electrode, pulsed capacitance discharges to target cable impacting with high pressure, produce pulse current in the cable, pulse current is maximum reaches hundreds of ampere.When DC electromagnet power supply closes, DC electromagnet adhesive, copper electrode is moved in pull-up, and isolate with cable, isolation voltage reaches 5kV, completes single step of releasing electric process, and the time relay constantly repeats above-mentioned discharge process, forms periodic discharging.The make-and-break time of regulating time relay, the cycle of adjustable pulses generation, setting cycle be 6 seconds adjustable by 15 seconds.
As preferably, described power module comprises power supply adaptor, rechargeable battery and power switch, power supply adaptor to be 24VDC power supply by the 220VAC Power convert of input be rechargeable battery charging, rechargeable battery by power switch for control of discharge unit provides low-voltage dc power supply.Described rechargeable battery adopts polymer Li-ion rechargeable battery.
As preferably, described pulsed capacitance adopts the noninductive pulsed capacitance of high pressure, filled with oil, and overload capacity is strong, safe and reliable.
As preferably, described high-voltage transformation unit adopts 30KV silicon rubber insulation line to carry out the direct wiring of each circuit to connect.
Described electronic impulse generation module mainly adopts electronic type high frequency high voltage dc power source to convert voltage 24V the DC voltage of 3kV to, charges to storage capacitor.Its input voltage is DC24V, exports the negative polarity high pressure into direct current 3kV.
During above-mentioned signal generator work, be applied on target cable core by high-voltage transformation unit by impacting with high pressure signal, signal, along cable distribution to far-end, then flows back to signal generator through ground connection.In discriminating place, signal receiver utilizes a flexible Luo-coil measurement to flow through the current signal of each bar cable, then goes out target cable according to the characteristic differentiation of signal.
Compared with prior art, electric signal generator tool of the present invention has the following advantages:
1) electronic type pulse generating module can produce the direct current negative polarity high pressure of 3kV, the high direct voltage exported is impulse capacitor charging, the energy of cable discharge is provided, by the timing of mechanical type periodic discharging switch, cable is discharged, under solving strong induced electricity, pulse signal is difficult to the problem applied;
2) adopt high performance chargeable lithium cell to power, normally can work under most rugged environment, ensure the adaptability of instrument, solve the problem of on-the-spot AC-less power;
3) security is high, inside establishes control of discharge unit, can under the emergency circumstance or powering-off state direct short-circuit pulsed capacitance, ensure cable identification device without High voltage output; Simultaneously when cable induction voltage to be identified exceeds gap breakdown voltage, ground connection discharge switch is breakdown, over the ground discharge prevention instrument, and antijamming capability is strong; Casing and High voltage output place of working between add protection, ensure the safety of operating personnel;
4) electric signal generator overall appearance is generous, simple and practical, and when operating, wiring is easy, simple to operate, and stable performance is safe and reliable.
Below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is the cable identification device detected state figure of the present embodiment;
Fig. 2 is the signal generator theory diagram of the present embodiment;
Fig. 3 is the signal generator control of discharge unit electrical schematic diagram of the present embodiment.
Embodiment
As shown in Figure 1, a kind of cable identification device, comprises signal generator 1 and signal receiver 2, during work, impacting with high pressure signal is applied on target cable 3 core by signal generator 1, and signal propagates into far-end along cable 3, then flows back to signal generator 1 through ground connection.In discriminating place, signal receiver 2 utilizes a flexible Luo-coil 21 to measure the current signal flowing through each bar cable 3, then goes out target cable according to the characteristic differentiation of signal.
As shown in Figure 2, signal generator 1 for cable identification device comprises power module, high-voltage transformation unit and control of discharge unit 14, described power module comprises power supply adaptor 11, rechargeable battery 12 and power switch 13, the 220VAC Power convert of input is 24VDC power supply by power supply adaptor is that rechargeable battery 12 charges, rechargeable battery 12 by power switch 13 for control of discharge unit 14 provides low-voltage dc power supply.In the present embodiment, described rechargeable battery 12 adopts polymer Li-ion rechargeable battery, and direct current exports 24V, capacity reaches 20Ah, and moment, working current was at more than 40A, was equipped with high-performance electric source adapter 11, maximum charging current can reach 2.5A, and has constant-current charge and be full of automatic stop function.Described high-voltage transformation unit comprises electronic impulse generation module 15, is connected in parallel on the voltage detecting circuit 16 in electronic impulse generation module 15 and pulsed capacitance 17.The principle of work of signal generator 1 is: the low-voltage dc power supply that described power module provides enters electronic impulse generation module 15 after control of discharge unit, direct output high direct voltage, voltage detecting circuit 16 detects high direct voltage output valve in real time, the high direct voltage exported is that pulsed capacitance 17 charges, the energy of cable discharge is provided, then by the timing of control of discharge unit, cable is discharged.
Described control of discharge unit is primarily of very first time relay 1KT, second time relay 2KT, cable periodic discharging DC electromagnet 3YA1, ground connection electric discharge DC electromagnet 3YA2, be connected to the mechanical type periodic discharging switch S 1 of pulsed capacitance 17 output terminal, be connected in parallel on the mechanical type ground connection discharge switch S2 at pulsed capacitance 17 two ends, and moving electrode and stationary electrode are formed, in 2 DC electromagnets, iron staff connects moving electrode, stationary electrode is connected to signal generator output terminal, DC electromagnet is connected with power module, very first time relay 1KT, second time relay 2KT is timing relay, wherein, within 6 seconds to 15 seconds, (to the general delay time of the very first time relay 1KT fundamental purpose one be full of electricity in order to ensure storage capacitor, two is to form obvious period distances, convenient operation identification), in the present embodiment, very first time relay 1KT sets time delay 6 seconds, and the second time relay 2KT is set as 0.4 second.The on/off of Control DC electromagnet, direct solenoid railway traction moving electrode, when DC electromagnet power supply disconnects, DC electromagnet is affected by gravity and falls, dynamic copper electrode contacts with quiet copper electrode, pulsed capacitance 17 pairs of target cable impacting with high pressure electric discharges, produce pulse current in the cable, pulse current is maximum reaches hundreds of ampere.When DC electromagnet power supply closes, DC electromagnet adhesive, copper electrode is moved in pull-up, isolate with cable, isolation voltage reaches 5kV, completes single step of releasing electric process, as shown in Figure 3, the specific works principle of control of discharge unit is: after turning on the power switch 13, and DC electromagnet 3YA1,3YA2 power on pull-up, and two switches are in open mode; 2KT-1 is normally closed contact, very first time relay 1KT connects through contact 2KT-1, owing to being delayed, when after the time delays reaching 6s, very first time relay 1KT action, normally closed contact 1KT-1 opens, cable periodic discharging DC electromagnet 3YA1 power-off, and fall, pulsed capacitance 17 pairs of cable discharges; The normally opened contact 1KT-2 of very first time relay 1KT closes, second time relay 2KT is energized, after 0.4s, second time relay 2KT action, normally closed contact 2KT-1 action is opened, very first time relay 1KT power-off, normally closed contact 1KT-1 power-failure close, cable periodic discharging DC electromagnet 3YA1 powers on pull-up, and electronic impulse generation module 15 paired pulses electric capacity 17 charges, and normally opened contact 1KT-2 power-off is opened, time relay 2KT power-off, normally closed contact 2KT-1 closes, and time relay 1KT powers on, and new loop cycle starts.When signal generator power-off or accident power-off, ground connection electric discharge DC electromagnet 3YA2 power-off, ground connection discharge switch S2 action falls, pulsed capacitance 16 shorted to earth, release store electrical energy, prevents device and exports charged, when cable induction voltage to be identified exceeds gap breakdown voltage, S2 is breakdown for ground connection discharge switch, over the ground discharge prevention signal generator;
In the present embodiment, described pulsed capacitance 16 adopts the noninductive pulsed capacitance of high pressure, filled with oil, and overload capacity is strong, safe and reliable.High frequency high voltage dc power source output terminal is connected to 50k Ω resistance, is connected to the storage capacitor of 10 μ F/5kV, and during power frequency, capacitive reactance is about 318 Ω, when induced voltage in heart yearn is 300V, and the undercurrent 1A of generation, and DC pulse current can reach hundreds of ampere.And DC pulse voltage can reach 3kV, much larger than induced voltage, pulse can be easy to be applied on cable.
Described electronic impulse generation module 16 mainly adopts electronic type high frequency high voltage dc power source 24V DC voltage to be converted to the DC voltage of 3kV, charges to storage capacitor.The input voltage of electronic impulse generation module 16 is DC24V, exports the negative polarity high pressure into direct current 3kV.Described high-voltage transformation unit adopts 30KV silicon rubber insulation line to carry out the direct wiring connection of each circuit.
Above-described embodiment and graphic and non-limiting product form of the present invention and style, any person of an ordinary skill in the technical field, to its suitable change done or modification, all should be considered as not departing from patent category of the present invention.
Claims (7)
1. the signal generator for cable identification device, it is characterized in that: comprise power module, high-voltage transformation unit and control of discharge unit, described high-voltage transformation unit comprises electronic impulse generation module, be connected in parallel on the voltage detecting circuit in electronic impulse generation module and pulsed capacitance, described control of discharge unit comprises the time relay, DC electromagnet for controlling to carry out cable periodic discharge, and is connected to the mechanical type periodic discharging switch of pulsed capacitance output terminal; The low-voltage dc power supply that described power module provides enters electronic impulse generation module after control of discharge unit, direct output high direct voltage, voltage detecting circuit detects high direct voltage output valve in real time, the high direct voltage exported is pulsed capacitance charging, the energy of cable discharge is provided, then by the timing of control of discharge unit, cable is discharged.
2. a kind of signal generator for cable identification device as claimed in claim 1, is characterized in that: described control of discharge unit comprises the mechanical type ground connection discharge switch being connected in parallel on pulsed capacitance two ends further.
3. a kind of signal generator for cable identification device as claimed in claim 2, it is characterized in that: described control of discharge unit is primarily of 2 groups of time relays, 2 groups of DC electromagnets, 1 mechanical type periodic discharging switch, 1 mechanical type ground connection discharge switch, and moving electrode and stationary electrode are formed, in DC electromagnet, iron staff connects moving electrode, stationary electrode is connected to signal generator output terminal, DC electromagnet is connected with power module, the time relay controls the on/off of DC electromagnet, direct solenoid railway traction moving electrode, when DC electromagnet power supply disconnects, DC electromagnet is affected by gravity and falls, dynamic copper electrode contacts with quiet copper electrode, pulsed capacitance discharges to target cable impacting with high pressure, when DC electromagnet power supply closes, DC electromagnet adhesive, copper electrode is moved in pull-up, isolate with cable, complete single step of releasing electric process.
4. a kind of signal generator for cable identification device as claimed in claim 1, it is characterized in that: described power module comprises power supply adaptor, rechargeable battery and power switch, the 220VAC Power convert of input is 24VDC power supply by power supply adaptor is rechargeable battery charging, rechargeable battery is by power switch for control of discharge unit provides low-voltage dc power supply, and rechargeable battery adopts polymer Li-ion rechargeable battery.
5. a kind of signal generator for cable identification device as claimed in claim 1, is characterized in that: described pulsed capacitance adopts the noninductive pulsed capacitance of high pressure.
6. a kind of signal generator for cable identification device as claimed in claim 1, is characterized in that: described high-voltage transformation unit adopts 30KV silicon rubber insulation line to carry out the direct wiring of each circuit to connect.
7. a kind of signal generator for cable identification device as claimed in claim 1, it is characterized in that: described electronic impulse generation module mainly adopts electronic type high frequency high voltage dc power source to convert voltage 24V the DC voltage of 3kV to, its input voltage is DC24V, exports the negative polarity high pressure into direct current 3kV.
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| CN201410784496.6A CN104459237B (en) | 2014-12-16 | 2014-12-16 | A kind of signal generator for cable identification device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104914291A (en) * | 2015-06-01 | 2015-09-16 | 苏州市华安普电力工程有限公司 | Cable identification instrument device |
| CN110288812A (en) * | 2019-06-26 | 2019-09-27 | 深圳市联讯通讯技术有限公司 | A kind of hunting tool for cable |
| CN110531234A (en) * | 2019-09-26 | 2019-12-03 | 武汉三相电力科技有限公司 | A kind of identification extracting method of transmission line of electricity discharge pulse |
| CN111009884A (en) * | 2019-12-10 | 2020-04-14 | 中国工程物理研究院应用电子学研究所 | False breakdown response system and implementation method of pulse power device |
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