CN207832854U - A kind of driving source system for grounded screen detection - Google Patents
A kind of driving source system for grounded screen detection Download PDFInfo
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- CN207832854U CN207832854U CN201721640866.4U CN201721640866U CN207832854U CN 207832854 U CN207832854 U CN 207832854U CN 201721640866 U CN201721640866 U CN 201721640866U CN 207832854 U CN207832854 U CN 207832854U
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Abstract
The utility model is related to a kind of driving source systems for grounded screen detection, including power supply, function signal generator, power amplification circuit, impedance transformer and power frequency display unit；Wherein, function signal generator includes controlling to adjust circuit, signal generating circuit and amplification output stage; power amplification circuit includes input stage, pushes grade, output stage and protected level; protected level is connect with grade and output stage is pushed respectively; impedance transformer includes primary coil, secondary coil and iron core; iron core is the iron core of the nanocrystalline material of annular, and primary coil and secondary coil are wrapped on iron core.The utility model solves the problems, such as power amplifier and grounded screen load matched, it can adapt to different loads, realize the continuously adjustable of frequency and electric current, have sine wave and duty ratio two kinds of working methods of adjustable pulse signal, it can be according to measurement needs, by the selection of impedance transformer no-load voltage ratio, higher output voltage or exciting current signal are obtained.
Description
Technical field
The utility model is related to grounded screen detection technique fields, in particular to a kind of swashing for grounded screen detection
Encourage source system.
Background technology
Electric power pylon grounded screen plays a very important role in the safe operation of power Transmission, and ground connection performance is direct
It is related to the normal operation of transmission line of electricity, the grounded screen in China mostly uses greatly steel material making, more with the growth of service life
Rain and coastal area easily occur the corrosion or fracture of grounding grids, influence the ground connection performance of grounded screen.For this purpose, country works out
Relevant criterion, annual power department will carry out soil resistivity, impedance ground, surface potential, contact potential etc. and routinely examine
It looks into, it, sometimes will also be by being directly injected into excitation to grounded screen to judge whether the ground connection performance of grounded screen meets safety requirements
Electric current searches the breakpoint and heavy corrosion section of grounded screen by the measurement of earth's surface electromagnetic quantities.
It is detected with the engineering of diagnosis in practice in grounded screen, is required for a pumping signal, in order to easy to carry, current
Driving source mostly uses storage battery power supply, and output current is small, frequency range is narrow, carrying load ability is poor；And for needing larger current
The case where, some power supplys modulate amplifying technique (PWM) frequently with intermittent pulsed mode, some using pulse width,
A certain frequency is selected to obtain sine wave by filtering, the working frequency of this power supply is single, and it is negative not adapt to grounded screen complexity
The operating condition of load, in the diagnosis for measuring surface potential, Distribution of Magnetic Field, it is sometimes desirable to pulse excitation, it is sometimes desirable to sine wave
Excitation, and require the frequency of pumping signal that can adjust in a certain range, and because of the of different sizes of grounded screen, load has
Uncertain feature, only several ohm of zero, can reach more than ten ohm sometimes sometimes.
Utility model content
In order to solve the above technical problems, the utility model provides a kind of driving source system for grounded screen detection, have
Certain working band has several amperes to tens amperes of current output capability, can adapt to the uncertain of grounded screen load
Property feature；With the continuous work ability under multiple waveforms working method and high current working condition.
The technical solution adopted in the utility model is：A kind of driving source system for grounded screen detection is provided, including is supplied
Power supply, function signal generator, power amplification circuit, impedance transformer and power frequency display unit；The power supply
It is connected respectively with the function signal generator, power amplification circuit and power frequency display unit, the function signal occurs
Device, power amplification circuit, impedance transformer are sequentially connected, the impedance transformer also respectively with the power frequency display unit
It loads and connects with grounded screen；The function signal generator includes controlling to adjust circuit, signal generating circuit and amplification output stage,
The power amplification circuit includes input stage, pushes grade, output stage and protected level, the protected level respectively with the promotion grade and
The output stage connection, the impedance transformer include primary coil, secondary coil and iron core, and the iron core is the nanometer of annular
The iron core of brilliant material, the primary coil and the secondary coil are wrapped on the iron core.
Described in the utility model in the driving source system of grounded screen detection, the control and regulation circuit to include just
String signal controls to adjust circuit and pulse signal controls to adjust circuit, and the signal generating circuit includes sinusoidal signal generation circuit
And pulse signal generation circuit, the amplification output stage include sinusoidal signal amplification output stage and pulse signal amplification output stage.
In the driving source system described in the utility model detected for grounded screen, the primary coil and the power
Amplifying circuit connects, and is provided on the secondary coil for N number of tap with grounded screen load connection, N number of pumping
Head corresponds to different primary and secondary coil no-load voltage ratios respectively, wherein N is the integer more than or equal to 1.
In the driving source system described in the utility model detected for grounded screen, the winding wire diameter of the primary coil
For 2.0mm, the number of turns 160；Tap there are four being set altogether on the secondary coil, the winding wire diameter of the secondary coil is at first
It is 3.7mm at tap, at second tap be 2.0mm, at third tap and the 4th tap is 1.4mm, four pumpings
The number of turns at head is 80.
Described in the utility model in the driving source system of grounded screen detection, the thickness of the iron core be 75mm,
Internal diameter is 180mm, outer diameter 260mm.
Driving source system provided by the utility model for grounded screen detection passes through to existing linear power amplifier
It improves and the design of impedance transformer under conditions of ensureing enough current output capabilities, solves power and put in broad frequency band
The problem of big device is with grounded screen load matched, can adapt to different loads, realize continuously adjustable, the tool of frequency and electric current
Standby sine wave and duty ratio two kinds of working methods of adjustable pulse signal can pass through impedance transformer no-load voltage ratio according to needs are measured
Selection, obtain higher output voltage or exciting current signal, while the frequency of output signal and electric current have charactron in due course
It has been shown that, it is easy to use, it is widely used, a variety of need of Ground Network of Transmission Line with Renovation ground connection performance detection and fault diagnosis can be met
It wants.
Description of the drawings
Below in conjunction with accompanying drawings and embodiments, the utility model is described in further detail, in attached drawing：
Fig. 1 is the wire structural schematic diagram of the utility model embodiment；
Fig. 2 is impedance transformer and the equivalent circuit diagram of load；
Fig. 3 is impedance transformer magnetic core geometric parameter figure；
Fig. 4 is the electrical schematic diagram of impedance transformer.
Specific implementation mode
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only used to explain
The utility model is not used to limit the utility model.
As shown in Figure 1, the driving source system for grounded screen detection that the utility model embodiment provides, including power supply electricity
Source 1, function signal generator 2, power amplification circuit 3, impedance transformer 4 and power frequency display unit 5；Power supply 1 divides
Other and function signal generator 2, power amplification circuit 3 are connected with power frequency display unit 5, function signal generator 2, power
Amplifying circuit 3, impedance transformer 4 are sequentially connected, and impedance transformer 4 is also negative with power frequency display unit 5 and grounded screen respectively
Carry connection.Specifically, function signal generator 2 includes controlling to adjust circuit 21, signal generating circuit 22 and amplification output stage 23,
It includes that sinusoidal signal controls to adjust circuit 21 and pulse signal control and regulation circuit 21, signal generating circuit to control to adjust circuit 21
22 include sinusoidal signal generation circuit 22 and pulse signal generation circuit 22, and amplification output stage 23 includes sinusoidal signal amplification output
Grade 23 and pulse signal amplify output stage 23.Wherein, sinusoidal signal controls to adjust circuit 21 and is used to carry out signal for staff
Frequency is adjusted, and regulating command is sent in sinusoidal signal generation circuit 22；Sinusoidal signal generation circuit 22 is based on the frequency
Instruction generates the original sine signal of corresponding frequencies；Sinusoidal signal amplification output stage 23 is for being amplified original sine signal
Processing obtains the sine wave signal.As it can be seen that sinusoidal signal controls to adjust circuit 21, sinusoidal signal generation circuit 22 and sinusoidal letter
Number amplification output stage 23 for generate sine wave signal and carry out signal frequency adjusting；When carrying out signal frequency adjusting, should note
Meaning sinusoidal waveform cannot be distorted.Similarly, pulse signal controls to adjust circuit 21 and is used to carry out signal pulse width for staff
It adjusts, and regulating command is sent in pulse signal generation circuit 22；Pulse signal generation circuit 22 is based on the pulse width
Instruction generates the inceptive impulse signal of corresponding pulses width；Pulse signal, which amplifies output stage 23, to be used to carry out inceptive impulse signal
Enhanced processing obtains the pulse signal.As it can be seen that pulse signal controls to adjust circuit 21, pulse signal generation circuit 22 and pulse
Signal amplification output stage 23 is for generating pulse signal and carrying out signal pulse width adjusting.Power amplification circuit 3 includes input
Grade 31 pushes grade 32, output stage 33 and protected level 34, protected level 34 to be connect respectively with grade 32 and output stage 33 is pushed.Power is put
Big circuit 3 is mainly used for power amplification and the output driving current of signal.When carrying out grounding net defect diagnosis in embodiment, work(
The design principle of rate amplifying circuit 3 is：(1) working frequency is in the frequency band of 10Hz~50kHz；(2) output signal frequency and defeated
Going out electric current can easily continuously adjust；(3) under conditions of ensureing that output signal has enough driving currents, itself can be continuous
Work.For above-mentioned requirements, linear prower amplifier technology is used in the present embodiment, 3 circuit of power amplification circuit includes input stage
31, grade 32, output stage 33 and protected level 34, final stage output is pushed to form complementary push-pull parallel connection using 10 pairs of high power transistors
Output form, the model 2SC5200 and 2SA1943 of transistor.Specifically, input stage 31 is sent out for receiving from sinusoidal signal
Raw device and/or the primary pumping signal of pulse signal generator output, and it is sequentially sent to push grade 32, at output stage 33
Reason, and finally obtain sinusoidal excitation signal or pulse excitation signal；Wherein, the effect of input stage 31 is the null offset of suppression circuit
And temperature drift, and output voltage when keeping power amplification circuit 3 static is zero, to ensure circuit stability, reliable work；
It is that enough driving currents are provided for output stage 33 to push the effect of grade 32；The effect of output stage 33 is to provide signal work(to load
Rate；Protected level 34 is connect with grade 32 and output stage 33 is pushed respectively, and effect is that grade 32 and output stage 33 is being pushed to encourage primary
When signal is amplified processing, circuit is protected not to be burned out.In the prior art, for input stage 31, promotion grade 32, output stage
33 and 34 circuit of protected level operation principle and the more mature (bibliography of design method：The clear transistors low-frequency channels of Xie Yuan,
People's Telecon Publishing House, 1981:275-295), details are not described herein.Impedance transformer 4 include primary coil, secondary coil and
Iron core, iron core are the iron core of the nanocrystalline material of annular, and primary coil and secondary coil are wrapped on iron core.Primary coil and work(
Rate amplifying circuit 3 connects, and is provided on secondary coil for N number of tap with grounded screen load connection, N number of tap corresponds to respectively
Different primary and secondary coil no-load voltage ratios, the primary and secondary coil no-load voltage ratio refers to the number of turns of primary coil and the number of turns of secondary coil
Ratio；Wherein, N is the integer more than or equal to 1.
Below according to Circuit theory, impedance transformer 4 is designed.Because duty factor transistor output impedance is much smaller,
If the output current of power output stage 33 is a monochromatic wave, use a current source as its equivalent circuit, by impedance transformer 4
All parameters are converted into the primary value of converter, then impedance transformer 4 and the equivalent circuit of load are as shown in Figure 2.
In Fig. 2, C1For primary coil distribution capacity, C'2=C2/n2It is converted into primary value for secondary coil distribution capacity,
r1It is hindered for the copper of primary coil, r'2=n2r2It is converted into primary value, L for the resistance of secondary coil copper1For the leakage inductance of primary coil, L'2=
n2L2It is converted into primary value, L for secondary coil leakage inductance0To encourage inductance, R'L=n2RLIt is converted into primary for secondary load resistance
Value, n=N1/N2For the no-load voltage ratio of primary and secondary.In Mid Frequency, distribution capacity and excitation inductance are considered as open circuit, and leakage inductance is considered as short
Road, at this time the total impedance of power amplifier load be：
RO=r1+r'2+R'L (1)
The transfer efficiency of impedance transformer 4 is：
η in formulaTFor transfer efficiency, 0.9 is generally taken, no-load voltage ratio can be designed according to (2) formula.Low-frequency range, distribution capacity is still
It is considered as open circuit, leakage inductance is considered as short circuit, can be listed according to Circuit theory：
Lower frequency limit is taken as：
When load and lower frequency limit determine, inductance L is encouraged0It can be acquired by (4) formula.
4 magnetic core of impedance transformer uses circular nano crystalline substance iron core, as shown in figure 3, its saturation induction density Bs is more than
1.24T, Effective permeability is up to 105, empirically formula can calculate core section product, S=0.2PLfl(cm2), P in formulaLFor impedance
The power that converter 4 is exported to load, flFor lower frequency limit；Number of primary turnsl0To encourage inductance,
lcFor iron circuit average length, S accumulates for core cross section.
The electrical schematic diagram of impedance transformer 4 is as shown in figure 4, using four kinds of no-load voltage ratios 2:1、1:1、2:3 and 1:2 tap, with
Meet different measurement needs.In the present embodiment, the winding wire diameter of primary coil is 2.0mm (i.e. as shown in the figure), circle
Number is 160 (160T i.e. as shown in the figure), input current 30A；Tap there are four being set altogether on secondary coil, the winding of secondary coil
Line footpath is (i.e. as shown in the figure for 3.7mm at first tap), at second tap for 2.0mm (i.e. as shown in the figure), at third tap and the 4th tap for 1.4mm (i.e. as shown in the figure), the number of turns at four taps is equal
For 80 (80T i.e. as shown in the figure), output current 60A.The thickness of iron core is 75mm, internal diameter 180mm, outer diameter 260mm.Tool
Body, when selecting rheostatic as the impedance output end of first tap, primary and secondary coil no-load voltage ratio is 2:1；When selection second
When rheostatic as the impedance output end of a tap, primary and secondary coil no-load voltage ratio is 1:1；When select third tap as impedance
When rheostatic output end, primary and secondary coil no-load voltage ratio is 2:3；When select the 4th tap as the rheostatic output end of impedance
When, primary and secondary coil no-load voltage ratio is 1:2.
The armature winding (i.e. primary coil) of the output end connection impedance transformer 4 of power amplification circuit 3, according to measurement need
It wants, selects suitable secondary windings, that is, select the tap of suitable secondary coil as output end, export if necessary higher
Driving voltage signal, then select 2:3 or 1:2 primary and secondary coil no-load voltage ratio, exports higher exciting current signal if necessary,
Then select 2:1 or 1:1 primary and secondary coil no-load voltage ratio.Specifically, when measuring grounded screen electric potential signal, need to note to grounded screen
The pumping signal for entering high voltage-small current, then select 1:2 primary and secondary coil no-load voltage ratio is needed when measuring grounded screen magnetic field signal
The pumping signal that low-voltage, high-current is injected to grounded screen, then select 2:1 primary and secondary coil no-load voltage ratio.As it can be seen that in the present embodiment
In, by the design of primary coil, in broad frequency band, meet the load requirement of power amplifier；By making secondary coil adopt
It is exported with multi-tap, realizes using the method for changing primary and secondary coil no-load voltage ratio, according to the actual needs of measurement, promote output
Current or voltage, to obtain required pumping signal；The selection of magnetic core (i.e. iron core) material, can guarantee in working band, compared with
In the case of big operating current, there is preferable transfer efficiency.
The embodiments of the present invention are described above in association with attached drawing, but the utility model is not limited to
The specific implementation mode stated, the above mentioned embodiment is only schematical, rather than restrictive, this field it is common
Technical staff is not departing from the utility model aims and scope of the claimed protection situation under the enlightenment of the utility model
Under, many forms can be also made, these are belonged within the protection of the utility model.
Claims (5)
1. it is a kind of for grounded screen detection driving source system, which is characterized in that including power supply, function signal generator,
Power amplification circuit, impedance transformer and power frequency display unit；The power supply occurs with the function signal respectively
Device, power amplification circuit are connected with power frequency display unit, and the function signal generator, power amplification circuit, impedance become
Parallel operation is sequentially connected, and the impedance transformer is also connected with the power frequency display unit and grounded screen load respectively；It is described
Function signal generator includes controlling to adjust circuit, signal generating circuit and amplification output stage, the power amplification circuit to include
Input stage pushes grade, output stage and protected level, and the protected level is connect with the promotion grade and the output stage respectively, described
Impedance transformer includes primary coil, secondary coil and iron core, and the iron core is the iron core of the nanocrystalline material of annular, described first
Grade coil and the secondary coil are wrapped on the iron core.
2. the driving source system according to claim 1 for grounded screen detection, which is characterized in that the control and regulation electricity
Road includes that sinusoidal signal controls to adjust circuit and pulse signal control and regulation circuit, and the signal generating circuit includes sinusoidal signal
Circuit and pulse signal generation circuit occurs, the amplification output stage includes sinusoidal signal amplification output stage and pulse signal amplification
Output stage.
3. it is according to claim 1 for grounded screen detection driving source system, which is characterized in that the primary coil with
The power amplification circuit connects, and is provided on the secondary coil for N number of tap with grounded screen load connection, institute
It states N number of tap and corresponds to different primary and secondary coil no-load voltage ratios respectively, wherein N is the integer more than or equal to 1.
4. the driving source system according to claim 3 for grounded screen detection, which is characterized in that the primary coil
Winding wire diameter is 2.0mm, the number of turns 160；Tap there are four being set altogether on the secondary coil, the winding wire diameter of the secondary coil
It is 3.7mm at first tap, at second tap be 2.0mm, is at third tap and the 4th tap
1.4mm, the number of turns at four taps is 80.
5. the driving source system according to claim 1 for grounded screen detection, which is characterized in that the thickness of the iron core
For 75mm, internal diameter 180mm, outer diameter 260mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721640866.4U CN207832854U (en) | 2017-11-30 | 2017-11-30 | A kind of driving source system for grounded screen detection |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721640866.4U CN207832854U (en) | 2017-11-30 | 2017-11-30 | A kind of driving source system for grounded screen detection |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110531127A (en) * | 2019-07-23 | 2019-12-03 | 深圳市嘉兆鸿电子有限公司 | Power source |
| CN113030572A (en) * | 2021-02-26 | 2021-06-25 | 佛山市中研非晶科技股份有限公司 | Magnetic core impedance characteristic analysis method and magnetic core impedance test system applying same |
-
2017
- 2017-11-30 CN CN201721640866.4U patent/CN207832854U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110531127A (en) * | 2019-07-23 | 2019-12-03 | 深圳市嘉兆鸿电子有限公司 | Power source |
| CN110531127B (en) * | 2019-07-23 | 2021-08-27 | 深圳市嘉兆鸿电子有限公司 | Power source |
| CN113030572A (en) * | 2021-02-26 | 2021-06-25 | 佛山市中研非晶科技股份有限公司 | Magnetic core impedance characteristic analysis method and magnetic core impedance test system applying same |
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