CN104459237B - A kind of signal generator for cable identification device - Google Patents
A kind of signal generator for cable identification device Download PDFInfo
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- CN104459237B CN104459237B CN201410784496.6A CN201410784496A CN104459237B CN 104459237 B CN104459237 B CN 104459237B CN 201410784496 A CN201410784496 A CN 201410784496A CN 104459237 B CN104459237 B CN 104459237B
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Abstract
The present invention discloses a kind of signal generator for cable identification device, including power module, high-voltage transformation unit and control of discharge unit, the high-voltage transformation unit includes electronic impulse and occurs module, it is connected in parallel on voltage detecting circuit and pulsed capacitance in electronic impulse generation module, the control of discharge unit includes the time relay, the DC electromagnet for being used to control to carry out cable periodic discharge, and is connected to the mechanical periodic discharging switch of pulsed capacitance output end；The low-voltage dc power supply that the power module is provided enters electronic impulse after control of discharge unit and occurs module, directly export high direct voltage, voltage detecting circuit detects high direct voltage output valve in real time, the high direct voltage of output charges for pulsed capacitance, the energy of cable discharge is provided, then cable discharged by the timing of control of discharge unit.Signal generator of the present invention, the features such as with anti-interference strong, strong applicability, small volume.
Description
Technical field
The present invention relates to a kind of signal generator for cable identification device, belong to cable identification technology field.
Background technology
With fast-developing and life of urban resident quality the raising of urban economy, people are to living environment and appearance of city
Requirement also more and more higher.Power cable is powered because its is safe and reliable, be conducive to the advantages of beautifying city and factories and miness are laid out,
Cable is set to turn into a kind of trend of New Times new century, it produces brand-new reality to beautifying urban environment and lifting city function
Effect, has obtained increasingly being widely applied.The fast development of urban economy, need for electricity is also increased substantially so that cable is robbed
Repair operation and cable moves that to change engineering also more and more.In moving and changing and rush to repair operation, cable duct or excavate is often many in region
Bar different cross-sectional, different grades of cable are laid side by side, it is necessary to which it is the cable to be found of this task, the work to distinguish which bar
Make to be referred to as cable identification.According to《Electric power safety working regulation》10.2.1.9 bar requirement, cable identification work be related to the person and
Equipment safety, the reliability of identification result is extremely important, it is necessary to which 100% accurately and reliably.
The conventional method of cable identification is verification drawing, and manual site is examined, but the drawing of cable laying is usually not enough advised
Model, not enough in detail, or even lose and damage, the change missing of environment and marker is buried in addition, it is difficult to find target cable.
Rely primarily on cable identifier to carry out cable identification at present.The discriminating instrument apparatus of current each producer both at home and abroad with
The typical case the most of SEBAKMT and BAUR companies.Although most of identifier products realize that circuit structure and technical parameter have not
Together, but its operation principle is roughly the same, mainly there is pulse polarity method（Sense of current method, is presently the most popularized）With frequency induction method
Two kinds（Carry out mainly in combination with cable trace detect operation）.A signal, the signal are added with transmitter from target cable head end
Characteristic quantity with the power current voltage signal significant difference with running cable, such as shape of sense of current, signal, amplitude
Size, the time and cycle and duration etc. of signal transmitting, each of place need to be differentiated by then being detected on request with receiver
The characteristic quantity of observation signal on bar cable, so as to determine the target cable.
Found in actual job, the most popular all kinds of cable identifiers of current use are meeting the interference feelings such as strong induced electricity
Under condition, frequently result in erroneous judgement or apply that signal is more difficult, even damaging identification instrument situation, this moves to change to cable and robbed with failure
Repair work and bring great security risk.The analysis found that, domestic many cities and area due to for easy construction or
Cable passage is nervous, and many mesolow cables are laid with EHV XLPE power cable using same channels, multicore cable and single electricity
Cable mixing is laid, and the objective environment of high water level often causes cable sheath multipoint earthing in a part of cable passage, is having a power failure
Tested cable and same passage run cable lay in the same direction longer or different cable grounding resistance difference it is larger in the case of, often make
Into inducing stronger induced-current or voltage on power failure cable run；Further, since the revision of new edition design specification, original
The sheath induced voltage of single-core cable has brought up to 300V on the premise of having insulation protection from 50V, is obtaining cable length
While the advantage that elongated, transition joint tails off, single-ended cable sheath induced voltage is greatly improved.
Currently used cable identifier is in order to reach the safe and reliable performance for taking into account small in volume, signal generator
Using middle low power, and the current signal amplitude added is influenceed by different cable grounding resistance, often results in induced electricity serious
The pulse signal that interference signal generator applies, induced electricity reaches after certain numerical value that the overvoltage automatic protection of instrument is acted, from
And it is difficult to cause signal to apply, part home products is without over-voltage protection module, or even the failure burnt out that occurred smoldering, this
Also be detrimental to currently widely used digital small-power cable identifier can not normal work the reason for one of so that significantly
It has impact on cable repairing and road move the live efficiency for changing the work such as engineering.
Moreover, either domestic or external import instrument, receiving instrument and pop one's head in it is larger, unsuitable test site
Using, such as cable shaft ditch, narrow space, receiving instrument is transferred to other use more difficult, even is difficult to instrument to be entrained into Jing Gou sometimes；Mesh
Before lay cable discharge it is more close, the distance between cable and space are too small, it is impossible to will probe or clamp be placed in therebetween, directly
Connect and have impact on being smoothed out for test.
So, the uniqueness of cable differentiates that to be badly in need of a kind of recognition performance reliable and stable, small volume, it is lightweight, be easy to test
The reception device that personnel carry with, particularly probe segment, given volume will be adapted to the test request of close-packed arrays cable.
In view of this, the present inventor is studied this, is specially developed a kind of signal for cable identification device and is sent out
Thus raw device, this case produces.
The content of the invention
It is an object of the invention to provide a kind of signal generator for cable identification device, strong sensing can be adapted to completely
The adverse circumstances such as electricity, AC-less power, and be easy to carry.
To achieve these goals, solution of the invention is：
A kind of signal generator for cable identification device, including power module, high-voltage transformation unit and control of discharge
Unit, the high-voltage transformation unit includes electronic impulse and occurs module, is connected in parallel on the voltage detecting in electronic impulse generation module
Circuit and pulsed capacitance, the control of discharge unit include be used for control to cable carry out periodic discharge the time relay,
DC electromagnet, and it is connected to the mechanical periodic discharging switch of pulsed capacitance output end；It is low that the power module is provided
Press dc source to enter electronic impulse after control of discharge unit and occur module, directly export high direct voltage, voltage detecting electricity
High direct voltage output valve is detected on road in real time, and the high direct voltage of output charges there is provided the energy of cable discharge for pulsed capacitance, then
Cable is discharged by the timing of control of discharge unit.
Preferably, the control of discharge unit further comprises the mechanical ground connection electric discharge for being connected in parallel on pulsed capacitance two ends
Switch, when cable induction voltage to be identified exceeds gap breakdown voltage, ground connection discharge switch is breakdown, and discharge prevention is believed over the ground
Number generator；When signal generator power-off or accident power-off, ground connection discharge switch action, pulsed capacitance shorted to earth,
Release storage electric energy, prevents that signal generator output is powered.
Preferably, the control of discharge unit is main by 2 groups of time relays, 2 groups of DC electromagnets, 1 it is mechanical
Periodic discharging switch, 1 mechanical ground connection discharge switch, and moving electrode and stationary electrode are constituted, and iron staff connects in DC electromagnet
Moving electrode is connect, stationary electrode is connected to signal generator output end, and DC electromagnet is connected with power module, time relay control
The on/off of DC electromagnet, direct solenoid railway traction moving electrode, when DC electromagnet power supply disconnects, DC electromagnet by
Gravity influence is fallen, and dynamic copper electrode is contacted with quiet copper electrode, and pulsed capacitance discharges target cable impacting with high pressure, produces in the cable
Raw pulse current, pulse current is maximum up to hundreds of amperes.When DC electromagnet power supply closes, DC electromagnet adhesive is drawn
Copper electrode is started, is isolated with cable, isolation voltage reaches 5kV, a discharge process is completed, the time relay constantly repeats above-mentioned put
Electric process, forms periodic discharging.The make-and-break time of regulating time relay, can adjust the cycle of pulses generation, sets the cycle as 6
Second is adjustable by 15 seconds.
Preferably, the power module includes power supply adaptor, rechargeable battery and power switch, power supply adaptor will be defeated
The 220VAC Power converts entered are that 24VDC power supplys are rechargeable battery charging, and rechargeable battery is control of discharge list by power switch
Member provides low-voltage dc power supply.The rechargeable battery uses polymer Li-ion rechargeable battery.
Preferably, the pulsed capacitance uses the noninductive pulsed capacitance of high pressure, internal oil-filled, overload capacity is strong, safely may be used
Lean on.
Connect preferably, the high-voltage transformation unit carries out the direct wiring of each circuit using 30KV silicon rubber insulations line
Connect.
The electronic impulse occurs module and voltage 24V mainly is converted into 3kV using electronic type high frequency high voltage dc power source
DC voltage, give storage capacitor charging.Its input voltage is DC24V, is output as direct current 3kV negative polarity high pressure.
During above-mentioned signal generator work, impacting with high pressure signal is applied to by target cable core by high-voltage transformation unit
On, then signal flows back to signal generator along cable distribution to distal end by ground connection.Differentiating place, signal receiver is utilized
The current signal of each bar cable is flowed through in one flexible Luo-coil measurement, then goes out target cable according to the characteristic differentiation of signal.
Compared with prior art, electric signal generator of the present invention has the following advantages that：
1) electronic type pulse generating module can produce 3kV direct current negative polarity high pressure, and the high direct voltage of output is pulse
Capacitor charging is discharged cable by the switch timing of mechanical periodic discharging, solved there is provided the energy of cable discharge
Under strong induced electricity, the problem of pulse signal is difficult to apply；
2) powered using high performance chargeable lithium cell, can under most rugged environments normal work, it is ensured that
The adaptability of instrument, the problem of solving live AC-less power；
3) it is safe, inside set control of discharge unit, can under the state of emergency or powering-off state direct short-circuit pulse electricity
Hold, it is ensured that cable identification device is 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, strong antijamming capability；Added in casing between High voltage output place of working
Protection, it is ensured that the safety of operating personnel；
4) electric signal generator overall appearance is generous, simple and practical, and in operation, wiring is easy, and simple to operate, performance is steady
It is fixed, it is safe and reliable.
The present invention is described in further detail below in conjunction with drawings and the specific embodiments.
Brief description of the drawings
Fig. 1 detects state diagram for the cable identification device 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, including signal generator 1 and signal receiver 2, during work, signal hair
Impacting with high pressure signal is applied on the core of target cable 3 by raw device 1, and signal travels to distal end along cable 3, then by ground connection stream
Return signal generator 1.Differentiating place, signal receiver 2 flows through each bar cable 3 using a measurement of flexible Luo-coil 21
Current signal, then goes out target cable according to the characteristic differentiation of signal.
As shown in Fig. 2 the signal generator 1 for cable identification device includes power module, high-voltage transformation unit and put
Electric control unit 14, the power module includes power supply adaptor 11, rechargeable battery 12 and power switch 13, and power supply adaptor will
The 220VAC Power converts of input are that 24VDC power supplys are that rechargeable battery 12 charges, and rechargeable battery 12 is to put by power switch 13
Electric control unit 14 provides low-voltage dc power supply.In the present embodiment, the rechargeable battery 12 is charged using polymer Li-ion
Battery, direct current output 24V, capacity reaches 20Ah, and moment operating current is equipped with high-performance electric source adapter 11 in more than 40A, maximum
Charging current is up to 2.5A, and with constant-current charge and full of automatic stop function.The high-voltage transformation unit is sent out including electronic impulse
Raw module 15, is connected in parallel on voltage detecting circuit 16 and pulsed capacitance 17 in electronic impulse generation module 15.Signal generator 1
Operation principle is：The low-voltage dc power supply that the power module is provided enters electronic impulse after control of discharge unit and occurs mould
Block 15, directly exports high direct voltage, and voltage detecting circuit 16 detects high direct voltage output valve in real time, and the high direct voltage of output is arteries and veins
Rush electric capacity 17 to charge there is provided the energy of cable discharge, then cable is discharged by the timing of control of discharge unit.
The control of discharge unit is main by very first time relay 1KT, and the second time relay 2KT, the cable cycle puts
Direct current electric magnet 3YA1, ground connection electric discharge DC electromagnet 3YA2, the mechanical cycle for being connected to the output end of pulsed capacitance 17 put
Electric switch S1, is connected in parallel on the mechanical ground connection discharge switch S2 at the two ends of pulsed capacitance 17, and moving electrode and stationary electrode are constituted, and 2
Iron staff connects moving electrode in individual DC electromagnet, and stationary electrode is connected to signal generator output end, DC electromagnet and power supply mould
Block is connected, and very first time relay 1KT, the second time relay 2KT is time-delay relay, wherein, very first time relay
The general delay times of 1KT 6 seconds to 15 seconds（Main purpose one is in order to ensure storage capacitor is fully charged；Two be obvious in order to be formed
Period distances, be easy to operation recognize）, in the present embodiment, very first time relay 1KT settings delay 6 seconds, the second time relay
Device 2KT is set as 0.4 second.The on/off of Control DC electromagnet, direct solenoid railway traction moving electrode, works as direct current
When magnet power supply disconnects, DC electromagnet, which is affected by gravity, to be fallen, and dynamic copper electrode is contacted with quiet copper electrode, and pulsed capacitance 17 is to mesh
The electric discharge of cable impacting with high pressure is marked, pulse current is produced in the cable, pulse current is maximum up to hundreds of amperes.Work as DC electromagnet
When power supply closes, copper electrode is moved in DC electromagnet adhesive, pull-up, is isolated with cable, and isolation voltage reaches 5kV, and completion is once discharged
Process, as shown in figure 3, the concrete operating principle of control of discharge unit is：After turning on the power switch 13, DC electromagnet
The upper electric pull-up of 3YA1,3YA2, two switches are in open mode；2KT-1 is normally-closed contact, and the very first time, relay 1KT was through contact
2KT-1 is connected, due to being delayed, after 6s time delayses are reached, very first time relay 1KT actions, normally-closed contact
1KT-1 is opened, cable periodic discharging DC electromagnet 3YA1 power-off, and is fallen, and pulsed capacitance 17 is to cable discharge；The very first time
Relay 1KT normally opened contact 1KT-2 closures, the second time relay 2KT is powered, after 0.4s, second time relay
2KT is acted, and normally-closed contact 2KT-1 actions are opened, very first time relay 1KT power-off, normally-closed contact 1KT-1 power-failure closes, electricity
Electric pull-up on cable periodic discharging DC electromagnet 3YA1, electronic impulse occurs module 15 and pulsed capacitance 17 is charged, normally opened contact
1KT-2 power-off is opened, time relay 2KT power-off, normally-closed contact 2KT-1 closures, electricity, new cycle on time relay 1KT
Circulation starts.When signal generator power-off or accident power-off, ground connection electric discharge DC electromagnet 3YA2 power-off, ground connection electric discharge
Switch S2 actions are fallen, the shorted to earth of pulsed capacitance 16, release storage electric energy, are prevented device and are exported powered, when electricity to be identified
When cable induced voltage exceeds gap breakdown voltage, ground connection discharge switch S2 is breakdown, over the ground discharge prevention signal generator；
In the present embodiment, the pulsed capacitance 16 uses the noninductive pulsed capacitance of high pressure, and internal oil-filled, overload capacity is strong,
It is safe and reliable.High frequency high voltage dc power source output is terminated with 50k Ω resistance, is connected to 10 μ F/5kV storage capacitor, during power frequency,
Capacitive reactance is about 318 Ω, and when induced voltage is 300V in cored wire, the electric current of generation is less than 1A, and DC pulse current is up to several
Hundred amperes.And pulse, much larger than induced voltage, readily can be applied on cable by DC pulse voltage up to 3kV.
The electronic impulse is occurred module 16 and is mainly changed 24V DC voltages using electronic type high frequency high voltage dc power source
Into 3kV DC voltage, storage capacitor charging is given.The input voltage that module 16 occurs for electronic impulse is DC24V, is output as direct current
3kV negative polarity high pressure.The high-voltage transformation unit carries out the direct wiring connection of each circuit using 30KV silicon rubber insulations line.
Above-described embodiment and schema and non-limiting product form of the invention and style, any art it is common
Appropriate change or modification that technical staff is done to it, all should be regarded as not departing from the patent category of the present invention.
Claims (5)
1. a kind of signal generator for cable identification device, it is characterised in that：Including power module, high-voltage transformation unit and
Control of discharge unit, the high-voltage transformation unit includes electronic impulse and occurs module, is connected in parallel on electronic impulse and occurs in module
Voltage detecting circuit and pulsed capacitance, the control of discharge unit include the time for being used to control to carry out cable periodic discharge
Relay, DC electromagnet, and it is connected to the mechanical periodic discharging switch of pulsed capacitance output end；The power module is carried
The low-voltage dc power supply of confession enters electronic impulse after control of discharge unit and occurs module, directly exports high direct voltage, voltage
Detection circuit detects high direct voltage output valve in real time, and there is provided the energy of cable discharge for pulsed capacitance charging for the high direct voltage of output
Amount, is then discharged cable by the timing of control of discharge unit；
The control of discharge unit further comprises the mechanical ground connection discharge switch for being connected in parallel on pulsed capacitance two ends；
The control of discharge unit is main by 2 groups of time relays, 2 groups of DC electromagnets, 1 mechanical periodic discharging switch, 1
Individual mechanical ground connection discharge switch, and moving electrode and stationary electrode are constituted, iron staff connection moving electrode, stationary electrode in DC electromagnet
Signal generator output end is connected to, DC electromagnet is connected with power module, the time relay controls the electricity of DC electromagnet
Source break-make, direct solenoid railway traction moving electrode, when DC electromagnet power supply disconnects, DC electromagnet, which is affected by gravity, to be fallen,
Moving electrode is contacted with stationary electrode, and pulsed capacitance discharges target cable impacting with high pressure, when DC electromagnet power supply closes, direct current
Electromagnetic actuation, pull-up moving electrode, isolates with cable, completes a discharge process.
2. a kind of signal generator for cable identification device as claimed in claim 1, it is characterised in that：The power supply mould
Block includes power supply adaptor, rechargeable battery and power switch, and the 220VAC Power converts of input are 24VDC electricity by power supply adaptor
Source is charged for rechargeable battery, and rechargeable battery provides low-voltage dc power supply, rechargeable battery by power switch for control of discharge unit
Using polymer Li-ion rechargeable battery.
3. a kind of signal generator for cable identification device as claimed in claim 1, it is characterised in that：The pulse electricity
Hold and use the noninductive pulsed capacitance of high pressure.
4. a kind of signal generator for cable identification device as claimed in claim 1, it is characterised in that：The high voltage variable
Unit is pressed to carry out the direct wiring connection of each circuit using 30KV silicon rubber insulations line.
5. a kind of signal generator for cable identification device as claimed in claim 1, it is characterised in that：The electronics arteries and veins
The DC voltage that voltage 24V is mainly converted into 3kV by module using electronic type high frequency high voltage dc power source occurs for punching, and it inputs electricity
Press as DC24V, be output as direct current 3kV negative polarity high pressure.
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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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| CN201410784496.6A CN104459237B (en) | 2014-12-16 | 2014-12-16 | A kind of signal generator for cable identification device |
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| CN104459237A CN104459237A (en) | 2015-03-25 |
| CN104459237B true CN104459237B (en) | 2017-11-07 |
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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 |
| CN110531234B (en) * | 2019-09-26 | 2021-06-04 | 武汉三相电力科技有限公司 | Method for identifying and extracting discharge pulse of power transmission line |
| CN111009884B (en) * | 2019-12-10 | 2021-09-21 | 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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| CN204269694U (en) * | 2014-12-16 | 2015-04-15 | 国家电网公司 | A kind of signal generator for cable identification device |
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| JP2000221228A (en) * | 1999-02-03 | 2000-08-11 | Nec Corp | Method and system for recognizing connection of connector |
| CN2826445Y (en) * | 2005-05-13 | 2006-10-11 | 魏玉生 | Intelligent line-checking machine |
| CN202886528U (en) * | 2012-11-12 | 2013-04-17 | 江苏省电力公司无锡供电公司 | Test device for identifying high-voltage cables |
| CN203587632U (en) * | 2013-11-27 | 2014-05-07 | 国家电网公司 | Switch device and cable identification device |
| CN203941198U (en) * | 2014-05-30 | 2014-11-12 | 咸亨国际（杭州）电气制造有限公司 | A kind of portable cable fault Positioning Power device |
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| CN204269694U (en) * | 2014-12-16 | 2015-04-15 | 国家电网公司 | A kind of signal generator for cable identification device |
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