CN108872696A - A kind of leakage current circuit measuring high voltage iron tower tester - Google Patents
A kind of leakage current circuit measuring high voltage iron tower tester Download PDFInfo
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- CN108872696A CN108872696A CN201810019577.5A CN201810019577A CN108872696A CN 108872696 A CN108872696 A CN 108872696A CN 201810019577 A CN201810019577 A CN 201810019577A CN 108872696 A CN108872696 A CN 108872696A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a kind of leakage current circuits for measuring high voltage iron tower tester, including signal acquisition module, preposition analog filter block, signal gain module, control module, the signal acquisition module passes through preposition analog filter block connection signal gain module, the signal gain module link control module.The precision that the present invention measures leakage current is high, and structure is simple, not power consumption, the measurement being suitble under wave propagation condition.
Description
Technical field
The present invention relates to a kind of leakage current circuits for measuring high voltage iron tower tester.
Background technique
Influence of the electric power pylon route of operation due to environmental factors such as lightning stroke, filth, ice and snow, high temperature and the temperature difference, insulation
Son can by strong electrical field, lightning impulse current, power frequency arc electric current effect and generate leakage circuit.Furthermore with national economy
Development, electric power pylon line voltage distribution grade constantly improve, this also substantially increases electric power pylon route triggering leakage current
Probability.Existing steel tower leakage current measuring method generally uses the mode of electromagnetic induction, and this method principle is mature, it is applicable to have
The wide advantage of range, but low precision.
Summary of the invention
The purpose of the present invention is overcoming the shortcomings of in existing product, a kind of leakage electricity for measuring high voltage iron tower tester is provided
Current circuit.
In order to achieve the above object, the present invention is achieved by the following technical solutions：
A kind of leakage current circuit measuring high voltage iron tower tester, including signal acquisition module, preposition analog filtering mould
Block, signal gain module, control module, the signal acquisition module pass through preposition analog filter block connection signal gain mould
Block, the signal gain module link control module.
The signal acquisition module is the configured transmission wave impedance circuit model of high voltage iron tower.
Preposition analog filter block include capacitor C11, capacitor C15, capacitor C20, capacitor C18, capacitor C19, capacitor C22,
Capacitor C23, resistance R26, resistance R27, resistance R28, resistance R29, resistance R10, resistance R13, power supply VREF, the capacitor C19
Both ends connection signal acquisition module, one end of the capacitor C19 passes through one end of capacitor C18 connection resistance R10, the capacitor
The other end of C19 passes through one end of capacitor C22 connection resistance R28, and one end of the resistance R10 passes through resistance R26 connection resistance
One end of R27, one end of the resistance R27 connect power supply VREF, and the other end of the resistance R27 connects one end of resistance R28,
The resistance R26 and capacitor C11 is in parallel, and the resistance R27 and capacitor C23 is in parallel, and the other end of the resistance R10 passes through
The other end of capacitor C15 connection resistance R28, one end of the other end connection resistance R13 of the resistance R10, the resistance R13's
The other end passes through one end of capacitor C20 connection resistance R29, the other end of the other end connection resistance R28 of the resistance R29, institute
One end of the other end and resistance R29 of stating resistance R13 all connection signal gain modules.
Signal gain module includes instrument amplifier UA3, resistance R11, resistance R12, resistance R14, resistance R16, resistance
R17, resistance R18, resistance R77, the instrument amplifier UA3 2 pins and 3 pins all connect preposition analog filter block, institute
State 13 pins, 14 pins, 15 pins, 16 pins all link control modules of instrument amplifier UA3, the instrument amplifier UA3
9 pins by resistance R17 connection power supply VREF, the 11 pins connection earth signal GND of the instrument amplifier UA3, the instrument
10 pins of table amplifier UA3 pass through one end of resistance R14 connection resistance R11, and the other end of the resistance R11 connects earth signal
By resistance R12 connection power supply VREF, one end of the resistance R11 is also connected with instrument amplification for one end of GND, the resistance R11
7 pins of 6 pins of device UA3, the instrument amplifier UA3 pass through resistance R77 connection power supply VREF, the instrument amplifier
7 pins of UA3 also pass through resistance R16 connection earth signal GND, and 8 pins of the instrument amplifier UA3 are connected by resistance R18
11 pins of 7 pins of instrument amplifier UA3, the instrument amplifier UA3 connect earth signal GND.
The power supply VREF is 1.65V.
Control module includes system processor U4A, the model STM32F407V of the system processor U4A.
Beneficial effects of the present invention are as follows：The precision that the present invention measures leakage current is high, and structure is simple, not power consumption, is suitble to
Measurement under wave propagation condition.
Detailed description of the invention
Fig. 1 is system block diagram of the invention；
Fig. 2 is the circuit diagram of control module；
Fig. 3 is the circuit diagram of preposition analog filter block, signal gain module；
Fig. 4 is the circuit diagram of signal acquisition module.
Specific embodiment
Technical solution of the present invention is described further with reference to the accompanying drawings of the specification：
As shown in Figure 1, a kind of leakage current circuit for measuring high voltage iron tower tester, including it is signal acquisition module 4, preposition
Analog filter block 1, signal gain module 2, control module 3, the signal acquisition module 4 pass through preposition analog filter block 1
Connection signal gain module 2,2 link control module 3 of signal gain module.The signal acquisition module 4 is high voltage iron tower
Configured transmission wave impedance circuit model, the configured transmission wave impedance circuit model of high voltage iron tower as shown in Figure 4 is that signal is adopted
Collect module, in figure, ZTFor steel tower wave impedance, ZAFor steel tower cross-arm wave impedance, Zs is lightning conducter wave impedance, and Zc is conducting wire wave impedance.
Uin1、Uin2、Uin3For the input end signal of preposition analog filter block.
As shown in figure 3, preposition analog filter block 1 includes capacitor C11, capacitor C15, capacitor C20, capacitor C18, capacitor
C19, capacitor C22, capacitor C23, resistance R26, resistance R27, resistance R28, resistance R29, resistance R10, resistance R13, power supply VREF,
One end of the both ends connection signal acquisition module 4 of the capacitor C19, the capacitor C19 passes through capacitor C18 connection resistance R10's
One end, the other end of the capacitor C19 pass through one end of capacitor C22 connection resistance R28, and one end of the resistance R10 passes through electricity
One end of R26 connection resistance R27 is hindered, one end of the resistance R27 connects power supply VREF, the other end connection of the resistance R27
One end of resistance R28, the resistance R26 and capacitor C11 are in parallel, and the resistance R27 and capacitor C23 is in parallel, the resistance
The other end of R10 passes through the other end of capacitor C15 connection resistance R28, and the other end of the resistance R10 connects the one of resistance R13
End, the other end of the resistance R13 pass through one end of capacitor C20 connection resistance R29, and the other end of the resistance R29 connects electricity
Hinder the other end of R28, the other end of the resistance R13 and one end all connection signal gain modules 2 of resistance R29.Capacitor C19's
After the acquisition signal input at both ends, increased by being transmitted to signal by single order high-pass filtering and two rank low-pass filtering after C19 capacitor resonance
Beneficial module 2.
As shown in figure 3, signal gain module 2 includes instrument amplifier UA3, resistance R11, resistance R12, resistance R14, resistance
R16, resistance R17, resistance R18, resistance R77, the instrument amplifier UA3 2 pins and 3 pins all connect preposition analog filtering
Module 1,13 pins of the instrument amplifier UA3,14 pins, 15 pins, 16 pins all link control modules 3, the instrument
9 pins of amplifier UA3 connect earth signal by resistance R17 connection power supply VREF, 11 pins of the instrument amplifier UA3
10 pins of GND, the instrument amplifier UA3 pass through one end of resistance R14 connection resistance R11, the other end of the resistance R11
Earth signal GND is connected, by resistance R12 connection power supply VREF, one end of the resistance R11 also connects for one end of the resistance R11
6 pins of instrument amplifier UA3 are connect, 7 pins of the instrument amplifier UA3 pass through resistance R77 connection power supply VREF, the instrument
7 pins of table amplifier UA3 also pass through resistance R16 connection earth signal GND, and 8 pins of the instrument amplifier UA3 pass through resistance
11 pins of 7 pins of R18 connection instrument amplifier UA3, the instrument amplifier UA3 connect earth signal GND.AD_CS is piece
Signal is selected, low level is effective.Three combinations of namely 14,15,16 pin of AD_A0, AD_A1, AD_A2 constitute 8 different gains,
Respectively 1,2,4,8,16,32,64,28 times of gain, since data acquisition range is 0~3.3V, so signal is pulled upward to
3.3/2 namely 1.65V (VREF in figure).The amplifier carried after signal gain amplification by AD, according to configuration resistance
8 times of amplifications being fixed, are filtered into the signal for acquisition for small signals amplification
The power supply VREF is 1.65V.
As shown in Fig. 2, control module 3 includes system processor U4A, the model of the system processor U4A
STM32F407V.System processor carries the data acquisition interface of 12 precision, samples controllable adopt using timers trigger ADC
The sample time.Every time after one group of data of acquisition, obtained data progress fft algorithm is converted, according to the value that transformation obtains, meter
It calculates and the ingredient for analyzing signal frequency calculates value, and control gain according to value is obtained.
The precision that the present invention measures leakage current is high, and structure is simple, not power consumption, the measurement being suitble under wave propagation condition.
It should be noted that listed above is only a kind of specific embodiment of the invention.It is clear that the invention is not restricted to
Upper embodiment, can also be there are many deforming, in short, those skilled in the art can directly lead from present disclosure
Out or all deformations for associating, it is considered as protection scope of the present invention.
Claims (6)
1. a kind of leakage current circuit for measuring high voltage iron tower tester, which is characterized in that including signal acquisition module (4), preceding
Analog filter block (1), signal gain module (2), control module (3) are set, the signal acquisition module (4) passes through preposition simulation
Filter module (1) connection signal gain module (2), signal gain module (2) link control module (3).
2. a kind of leakage current circuit for measuring high voltage iron tower tester according to claim 1, which is characterized in that the letter
Number acquisition module (4) is the configured transmission wave impedance circuit model of high voltage iron tower.
3. a kind of leakage current circuit for measuring high voltage iron tower tester according to claim 1, which is characterized in that before described
Set analog filter block (1) include capacitor C11, capacitor C15, capacitor C20, capacitor C18, capacitor C19, capacitor C22, capacitor C23,
The both ends company of resistance R26, resistance R27, resistance R28, resistance R29, resistance R10, resistance R13, power supply VREF, the capacitor C19
It connects signal acquisition module (4), one end of the capacitor C19 passes through one end of capacitor C18 connection resistance R10, the capacitor C19's
The other end passes through one end of capacitor C22 connection resistance R28, and one end of the resistance R10 passes through resistance R26 connection resistance R27's
One end, one end of the resistance R27 connect power supply VREF, and one end of the other end connection resistance R28 of the resistance R27 is described
Resistance R26 is in parallel with capacitor C11, and the resistance R27 and capacitor C23 is in parallel, and the other end of the resistance R10 passes through capacitor
The other end of C15 connection resistance R28, one end of the other end connection resistance R13 of the resistance R10, the resistance R13's is another
End passes through one end of capacitor C20 connection resistance R29, the other end of the other end connection resistance R28 of the resistance R29, the electricity
Hinder the other end of R13 and one end all connection signal gain modules (2) of resistance R29.
4. a kind of leakage current circuit for measuring high voltage iron tower tester according to claim 3, which is characterized in that the letter
Number gain module (2) includes instrument amplifier UA3, resistance R11, resistance R12, resistance R14, resistance R16, resistance R17, resistance
R18, resistance R77, the instrument amplifier UA3 2 pins and 3 pins all connect preposition analog filter block (1), the instrument
13 pins of amplifier UA3,14 pins, 15 pins, 16 pins all link control modules (3), the 9 of the instrument amplifier UA3
Pin connects earth signal GND by resistance R17 connection power supply VREF, 11 pins of the instrument amplifier UA3, and the instrument is put
10 pins of big device UA3 pass through one end of resistance R14 connection resistance R11, and the other end of the resistance R11 connects earth signal GND,
By resistance R12 connection power supply VREF, one end of the resistance R11 is also connected with instrument amplifier UA3 for one end of the resistance R11
6 pins, 7 pins of the instrument amplifier UA3 are by resistance R77 connection power supply VREF, the 7 of the instrument amplifier UA3
8 pins that pin also passes through resistance R16 connection earth signal GND, the instrument amplifier UA3 are put by resistance R18 connection instrument
7 pins of big device UA3,11 pins of the instrument amplifier UA3 connect earth signal GND.
5. a kind of leakage current circuit for measuring high voltage iron tower tester according to claim 3, which is characterized in that the electricity
Source VREF is 1.65V.
6. a kind of leakage current circuit for measuring high voltage iron tower tester according to claim 1, which is characterized in that the control
Molding block (3) includes system processor U4A, the model STM32F407V of the system processor U4A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810019577.5A CN108872696A (en) | 2018-01-09 | 2018-01-09 | A kind of leakage current circuit measuring high voltage iron tower tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810019577.5A CN108872696A (en) | 2018-01-09 | 2018-01-09 | A kind of leakage current circuit measuring high voltage iron tower tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108872696A true CN108872696A (en) | 2018-11-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810019577.5A Pending CN108872696A (en) | 2018-01-09 | 2018-01-09 | A kind of leakage current circuit measuring high voltage iron tower tester |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1553206A (en) * | 2003-12-18 | 2004-12-08 | 西安交通大学 | Electric power apparatus external insulative leakage current on-line monitoring system in converting station |
| CN201269913Y (en) * | 2008-10-07 | 2009-07-08 | 江苏省电力公司东海县供电公司 | Leakage current test instrument for insulation lever |
| CN201489045U (en) * | 2009-09-02 | 2010-05-26 | 福建俊豪电子有限公司 | Leakage current detection device with controller |
| CN202794410U (en) * | 2012-07-11 | 2013-03-13 | 成都措普科技有限公司 | Monitoring system for leakage current of insulator |
| CN205506984U (en) * | 2016-02-22 | 2016-08-24 | 西京学院 | Power transmission line insulator leakage current on -line monitoring system |
| CN106093543A (en) * | 2016-06-07 | 2016-11-09 | 国网电力科学研究院武汉南瑞有限责任公司 | Direct current cables leakage current electrification detection system |
-
2018
- 2018-01-09 CN CN201810019577.5A patent/CN108872696A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1553206A (en) * | 2003-12-18 | 2004-12-08 | 西安交通大学 | Electric power apparatus external insulative leakage current on-line monitoring system in converting station |
| CN201269913Y (en) * | 2008-10-07 | 2009-07-08 | 江苏省电力公司东海县供电公司 | Leakage current test instrument for insulation lever |
| CN201489045U (en) * | 2009-09-02 | 2010-05-26 | 福建俊豪电子有限公司 | Leakage current detection device with controller |
| CN202794410U (en) * | 2012-07-11 | 2013-03-13 | 成都措普科技有限公司 | Monitoring system for leakage current of insulator |
| CN205506984U (en) * | 2016-02-22 | 2016-08-24 | 西京学院 | Power transmission line insulator leakage current on -line monitoring system |
| CN106093543A (en) * | 2016-06-07 | 2016-11-09 | 国网电力科学研究院武汉南瑞有限责任公司 | Direct current cables leakage current electrification detection system |
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Application publication date: 20181123 |