CN210514479U - Anti-interference zinc oxide arrester monitoring device - Google Patents
Anti-interference zinc oxide arrester monitoring device Download PDFInfo
- Publication number
- CN210514479U CN210514479U CN201921043359.1U CN201921043359U CN210514479U CN 210514479 U CN210514479 U CN 210514479U CN 201921043359 U CN201921043359 U CN 201921043359U CN 210514479 U CN210514479 U CN 210514479U
- Authority
- CN
- China
- Prior art keywords
- electrically connected
- resistor
- dual
- speed amplifier
- zinc oxide
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Measurement Of Current Or Voltage (AREA)
Abstract
The utility model provides an interference immunity zinc oxide arrester monitoring devices sets up electric connection's voltage extraction circuit, low pass filter, polarity conversion circuit in order in the voltage acquisition circuit, can acquire accurate voltage value through the voltage extraction circuit to set up current-limiting resistance, play the diode and the anti-interference electric capacity of guard action in the voltage extraction circuit, can filter the interference signal and the noise that the range is great at the front end; high-frequency interference and most higher harmonics are filtered by a low-pass filter, and the signal-to-noise ratio is improved; alternating current can be converted into square wave signals with peak values of 0-5V through the polarity conversion circuit, and an A/D conversion port of the processor can receive the square wave signals conveniently.
Description
Technical Field
The utility model relates to an arrester detection area especially relates to an interference immunity zinc oxide arrester monitoring devices.
Background
The zinc oxide arrester is an important primary device in power production in the power industry, is an important protection facility for a power supply line and power supply equipment, and has the main function of protecting other equipment from lightning overvoltage and system surge overvoltage in a transformer substation (a voltage boosting and reducing station) and a line. If a zinc oxide arrester in an electric power system is aged, moistened or failed, which may cause damage to electric power equipment and even cause large-scale faults, and the operating condition of the zinc oxide arrester can be analyzed and judged by the magnitude of the resistive current harmonic component of the zinc oxide arrester, in terms of hardware design, a current transformer and a voltage transformer are generally adopted to respectively extract the current and the voltage of the zinc oxide arrester, and the extracted signals are processed by signal conditioning, so that the acquisition of the current signals and the voltage signals is directly related to the result of final analysis, and the Chinese power science research institute in 1998 surveys the operating conditions of some online monitoring systems in a transformer substation, which shows that 35% of the problems are caused by inaccurate monitoring due to the fact that the acquired signals are easily affected by the external environment, the performance of monitoring devices is low, the anti-interference effect is poor and the like, consequently, for the interference immunity who improves the acquisition signal, the utility model provides an interference immunity zinc oxide arrester monitoring devices, its acquisition signal's interference immunity is strong, and the acquisition signal is accurate.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides an interference immunity zinc oxide arrester monitoring devices, its interference immunity of gathering the signal is strong, and the signal of gathering is accurate.
The technical scheme of the utility model is realized like this: the utility model provides an anti-interference zinc oxide arrester monitoring device, which comprises a voltage acquisition circuit, a current acquisition circuit, a wireless communication circuit and a processor with a built-in A/D converter, wherein the voltage acquisition circuit comprises a voltage extraction circuit, a low-pass filter and a polarity conversion circuit which are electrically connected in sequence;
the output end of the polarity conversion circuit is electrically connected with the A/D conversion port of the processor.
On the basis of the technical scheme, preferably, the voltage extraction circuit comprises a voltage transformer T1, a diode D2, a diode D3, resistors R18-R20, a capacitor C9, a capacitor C10 and a first AD8079 two-way high-speed amplifier;
one end of a resistor R18 is electrically connected with a cable where the zinc oxide arrester is located, the other end of the resistor R18 is electrically connected with one end of a primary side of a voltage transformer T1, the other end of the primary side of the voltage transformer T1 is grounded, one end of a secondary side of the voltage transformer T1 is electrically connected with a cathode of a diode D2, an anode of a diode D3 and a 2-pin of a first AD8079 two-way high-speed amplifier respectively, the other end of a secondary side of the voltage transformer T1 is electrically connected with an anode of a diode D2 and a cathode of a diode D3, a 1-pin of the first AD8079 two-way high-speed amplifier, one end of a resistor R19 and one end of a resistor R20 respectively, the other end of the resistor R19 is electrically connected with an 8-pin of the first AD8079 two-way high-speed amplifier through a capacitor C9, the other end of the resistor R20 is electrically connected with an 8-pin of the first AD8079 two-way, the 8 pins of the first AD8079 dual-path high-speed amplifier are electrically connected with the input end of the low-pass filter.
Further preferably, the low-pass filter comprises a resistor R21, a resistor R22, a capacitor C11 and a capacitor C12;
the 3 pins and the 4 pins of the first AD8079 dual-path high-speed amplifier are electrically connected with one end of a resistor R21 and one end of a capacitor C12, the other end of the capacitor C12 is grounded, the other end of the resistor R21 is electrically connected with the 8 pins of the first AD8079 dual-path high-speed amplifier through a resistor R22, the other end of the resistor R21 is electrically connected with the 5 pins and the 3 pins of the first AD8079 dual-path high-speed amplifier through a capacitor C11, and the 5 pins of the first AD8079 dual-path high-speed amplifier are electrically connected with the input end of the polarity conversion circuit.
Further preferably, the polarity conversion circuit comprises a second AD8079 two-way high-speed amplifier, resistors R23-R25 and a diode D4;
the 5 pins of the first AD8079 dual-path high-speed amplifier are electrically connected with the 1 pin of the second AD8079 dual-path high-speed amplifier through a resistor R23, the 8 pins of the second AD8079 dual-path high-speed amplifier are grounded through a resistor R24 and a resistor R25 which are electrically connected in sequence, the 8 pins of the second AD8079 dual-path high-speed amplifier are grounded through a diode D4 which is conducted reversely, and the 8 pins of the second AD8079 dual-path high-speed amplifier are electrically connected with an A/D conversion port of the processor.
Further preferably, the processor is a dsPIC30F6015 processor;
the AN1 pin of the dsPIC30F6015 processor is electrically connected to the 8 pin of a second AD8079 dual high speed amplifier.
On the basis of the above technical scheme, preferably, the current acquisition circuit comprises a current transformer, an I/V conversion circuit, a filter circuit and an amplification circuit which are electrically connected in sequence;
the current transformer is electrically connected with a cable where the zinc oxide arrester is located, and the output end of the amplifying circuit is electrically connected with an A/D conversion port of the processor.
On the basis of the technical scheme, preferably, the system further comprises a temperature and humidity sensor electrically connected with the I/O port of the processor.
On the basis of the above technical solution, preferably, the printer further includes a display and a printer electrically connected to the processor, respectively.
The utility model discloses an interference immunity zinc oxide arrester monitoring devices has following beneficial effect for prior art:
(1) the voltage acquisition circuit is internally provided with a voltage extraction circuit, a low-pass filter and a polarity conversion circuit which are electrically connected in sequence, so that an accurate voltage value can be acquired through the voltage extraction circuit, and the voltage extraction circuit is internally provided with a current-limiting resistor, a diode with a protection function and an anti-interference capacitor, so that interference signals and noises with large amplitude can be filtered at the front end; high-frequency interference and most higher harmonics are filtered by a low-pass filter, and the signal-to-noise ratio is improved; alternating current can be converted into square wave signals with peak values of 0-5V through the polarity conversion circuit, and an A/D conversion port of the processor can receive the square wave signals conveniently.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a structural diagram of the anti-interference zinc oxide arrester monitoring device of the utility model;
fig. 2 is a circuit diagram of a voltage acquisition circuit in the anti-interference zinc oxide arrester monitoring device of the utility model.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.
As shown in fig. 1, the utility model discloses an interference immunity zinc oxide arrester monitoring devices, it includes the treater of voltage acquisition circuit, current acquisition circuit, wireless communication circuit and built-in AD converter. The voltage acquisition circuit and the current acquisition circuit are electrically connected with the A/D conversion port of the processor respectively, and the wireless communication circuit is electrically connected with the communication port of the processor.
In this embodiment, the voltage acquisition circuit acquires phase voltages and phase voltages when the zinc oxide arrester operates, and the phase voltages can be extracted in a mode of a voltage transformer, but the extracted voltages are not applicable to subsequent circuits and need to be processed. In this embodiment, the voltage acquisition circuit includes a voltage extraction circuit, a low-pass filter, and a polarity conversion circuit electrically connected in sequence; the output end of the polarity conversion circuit is electrically connected with the A/D conversion port of the processor.
In the present embodiment, as shown in fig. 2, the voltage extraction circuit includes a voltage transformer T1, a diode D2, a diode D3, resistors R18-R20, a capacitor C9, a capacitor C10, and a first AD8079 two-way high-speed amplifier; specifically, one end of a resistor R18 is electrically connected to a cable where the zinc oxide arrester is located, the other end of the resistor R18 is electrically connected to one end of a primary side of a voltage transformer T1, the other end of the primary side of the voltage transformer T1 is grounded, one end of a secondary side of the voltage transformer T1 is electrically connected to a cathode of a diode D2, an anode of a diode D3, and a 2-pin of a first AD8079 dual-way high-speed amplifier, the other end of a secondary side of the voltage transformer T1 is electrically connected to an anode of a diode D2 and a cathode of a diode D3, a 1-pin of the first AD8079 dual-way high-speed amplifier, one end of a resistor R19, and one end of a resistor R20, the other end of the resistor R19 is electrically connected to an 8-pin of the first AD8079 dual-way high-speed amplifier through a capacitor C9, the other end of the resistor R20 is electrically connected to an 8-pin of the first AD8079 dual-way high, the 8 pins of the first AD8079 dual-path high-speed amplifier are electrically connected with the input end of the low-pass filter. The voltage transformer T1 needs to have higher precision, in this embodiment, a precision miniature voltage transformer HPT304 is selected, the maximum input current of the HPT304 is 10mA, the maximum input voltage of the primary side of the HPT304 is 1000V, the voltage of the input HPT304 can be set through the input voltage and the current limiting resistor R18, in this embodiment, the resistance value of the resistor R18 is 1K, so that the current passing through the HPT304 is 0-2 mA, the corresponding transformer output current is also 0-2 mA, the required voltage value can be obtained at the output end by adjusting the feedback resistor R19 and the resistor R20, in this embodiment, the resistance values of the resistor R19 and the resistor R20 are 10K, wherein the diode D2 and the diode D3 play a role in protection, the capacitor C9 is an anti-interference capacitor, and the capacitance value thereof is 1000P.
In this embodiment, since the voltage signal collected by the voltage transformer T1 may be affected by electromagnetic interference and higher harmonics from the outside, and some noise signals may be generated by the voltage transformer T1 or the first AD8079 dual-path high-speed amplifier itself, if such noise signals are too large, the signal to be measured may be annihilated in a serious condition, and therefore, a low-pass filter is provided to filter out high-frequency interference and most higher harmonics, and the signal-to-noise ratio thereof is improved. As shown in fig. 2, the low pass filter includes a resistor R21, a resistor R22, a capacitor C11, and a capacitor C12; specifically, the 3 pin and the 4 pin of the first AD8079 dual-path high-speed amplifier are electrically connected with one end of a resistor R21 and one end of a capacitor C12, the other end of the capacitor C12 is grounded, the other end of the resistor R21 is electrically connected with the 8 pin of the first AD8079 dual-path high-speed amplifier through a resistor R22, the other end of the resistor R21 is electrically connected with the 5 pin and the 3 pin of the first AD8079 dual-path high-speed amplifier through a capacitor C11, and the 5 pin of the first AD8079 dual-path high-speed amplifier is electrically connected with the input end of the polarity conversion circuit. Since the harmonic of 5 th order and above 5 th order needs to be filtered, 250Kz is the cut-off frequency of the low-pass filter, so that the resistance values of the resistor R21 and the resistor R22 are both 2K, and the capacitance values of the capacitor C11 and the capacitor C12 are both 0.33 uF. Since the performance of the low-pass filter is related to the performance of the selected operational amplifier, in this embodiment, the AD8079 dual-path high-speed amplifier is selected, and since the first AD8079 dual-path high-speed amplifier in the voltage extraction circuit only uses one of the two paths of amplifiers, the other end amplifier of the first AD8079 dual-path high-speed amplifier is selected in the low-pass filter to save cost and space. The AD8079 two-way high-speed amplifier has the characteristics of low temperature drift, low offset voltage, high precision, high gain, low power consumption and the like.
Since the voltage signal collected by the voltage transformer T1 is an ac signal with positive and negative components, and the voltage input range of the a/D conversion port built in the processor is 0-5V, it is necessary to perform polarity conversion when performing a/D conversion on the voltage signal, so that the voltage thereof is 0-5V. In the present embodiment, the polarity conversion circuit includes a second AD8079 two-way high-speed amplifier, resistors R23-R25, and a diode D4; specifically, the 5 pin of the first AD8079 dual-path high-speed amplifier is electrically connected with the 1 pin of the second AD8079 dual-path high-speed amplifier through a resistor R23, the 8 pin of the second AD8079 dual-path high-speed amplifier is grounded through a resistor R24 and a resistor R25 which are electrically connected in sequence, the 8 pin of the second AD8079 dual-path high-speed amplifier is grounded through a diode D4 which is conducted in the reverse direction, and the 8 pin of the second AD8079 dual-path high-speed amplifier is electrically connected with an a/D conversion port of the processor. Since the 1 pin of the second AD8079 dual-path high-speed amplifier has current and the 2 pin thereof is suspended, no current flows, the polarity inversion is realized by the current runaway of the two input ends, which is a standard feedback runaway phenomenon, and the diode D4 plays a role in voltage stabilization.
In this embodiment, the processor employs a dsPIC30F6015 processor; the AN1 pin of the dsPIC30F6015 processor is electrically connected to the 8 pin of a second AD8079 dual high speed amplifier.
And the current acquisition circuit acquires leakage current. In this embodiment, the current collecting circuit includes a current transformer, an I/V conversion circuit, a filter circuit, and an amplifying circuit, which are electrically connected in sequence; the current transformer is electrically connected with a cable where the zinc oxide arrester is located, and the output end of the amplifying circuit is electrically connected with an A/D conversion port of the processor. Since the structure of the current collection circuit is a common means in the art, and the present embodiment does not involve the improvement of the current collection circuit, the description thereof will not be repeated here.
Further preferably, the temperature and humidity sensor is electrically connected with the I/O port of the processor.
Further preferably, the system further comprises a display and a printer which are respectively electrically connected with the processor.
The working principle of the voltage acquisition of the embodiment is as follows: the primary side of a transformer T1 collects voltage on a cable where a zinc oxide arrester is located and outputs 0-2 mA current, the 0-2 mA current is output to a first AD8079 double-path high-speed amplifier for amplification, an amplified signal is output to a second path of input end of the first AD8079 double-path high-speed amplifier, a low-pass filter composed of the second path of input end of the first AD8079 double-path high-speed amplifier and a peripheral circuit filters out high-order harmonics, the voltage is converted into 0-5V unipolar voltage through a polarity conversion circuit, and the unipolar voltage is output to an A/D conversion port of a dsPIC30F6015 processor for A/D conversion.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The utility model provides an interference immunity zinc oxide arrester monitoring devices, its treater that includes voltage acquisition circuit, current acquisition circuit, wireless communication circuit and built-in AD converter which characterized in that: the voltage acquisition circuit comprises a voltage extraction circuit, a low-pass filter and a polarity conversion circuit which are electrically connected in sequence;
the output end of the polarity conversion circuit is electrically connected with an A/D conversion port of the processor.
2. The interference immunity zinc oxide arrester monitoring device of claim 1, wherein: the voltage extraction circuit comprises a voltage transformer T1, a diode D2, a diode D3, resistors R18-R20, a capacitor C9, a capacitor C10 and a first AD8079 two-way high-speed amplifier;
one end of the resistor R18 is electrically connected with a cable where the zinc oxide arrester is located, the other end of the resistor R18 is electrically connected with one end of the primary side of the voltage transformer T1, the other end of the primary side of the voltage transformer T1 is grounded, one end of the secondary side of the voltage transformer T1 is electrically connected with the cathode of the diode D2, the anode of the diode D3 and the 2-pin of the first AD8079 dual-way high-speed amplifier respectively, the other end of the secondary side of the voltage transformer T1 is electrically connected with the anode of the diode D2 and the cathode of the diode D3, the 1-pin of the first AD8079 dual-way high-speed amplifier, one end of the resistor R19 and one end of the resistor R20 respectively, the other end of the resistor R19 is electrically connected with the 8-pin of the first AD8079 dual-way high-speed amplifier through a capacitor C9, the other end of the resistor R20 is electrically connected with the 8-pin of the first AD8079 dual-way high, the 8 pins of the first AD8079 dual-path high-speed amplifier are electrically connected with the input end of the low-pass filter.
3. An interference immunity zinc oxide arrester monitoring device as claimed in claim 2, wherein: the low-pass filter comprises a resistor R21, a resistor R22, a capacitor C11 and a capacitor C12;
the 3 pins and the 4 pins of the first AD8079 dual-path high-speed amplifier are electrically connected with one end of a resistor R21 and one end of a capacitor C12, the other end of the capacitor C12 is grounded, the other end of the resistor R21 is electrically connected with the 8 pins of the first AD8079 dual-path high-speed amplifier through a resistor R22, the other end of the resistor R21 is electrically connected with the 5 pins and the 3 pins of the first AD8079 dual-path high-speed amplifier through a capacitor C11, and the 5 pins of the first AD8079 dual-path high-speed amplifier are electrically connected with the input end of the polarity conversion circuit.
4. An interference immunity zinc oxide arrester monitoring device as claimed in claim 3, wherein: the polarity conversion circuit comprises a second AD8079 two-way high-speed amplifier, resistors R23-R25 and a diode D4;
the 5 pins of the first AD8079 dual-path high-speed amplifier are electrically connected with the 1 pin of the second AD8079 dual-path high-speed amplifier through a resistor R23, the 8 pins of the second AD8079 dual-path high-speed amplifier are grounded through a resistor R24 and a resistor R25 which are electrically connected in sequence, the 8 pins of the second AD8079 dual-path high-speed amplifier are grounded through a diode D4 which is conducted reversely, and the 8 pins of the second AD8079 dual-path high-speed amplifier are electrically connected with an A/D conversion port of the processor.
5. An interference immunity zinc oxide arrester monitoring device as claimed in claim 4, wherein: the processor adopts a dsPIC30F6015 processor;
the AN1 pin of the dsPIC30F6015 processor is electrically connected to the 8 pin of a second AD8079 dual high speed amplifier.
6. The interference immunity zinc oxide arrester monitoring device of claim 1, wherein: the current acquisition circuit comprises a current transformer, an I/V conversion circuit, a filter circuit and an amplifying circuit which are electrically connected in sequence;
the current transformer is electrically connected with a cable where the zinc oxide arrester is located, and the output end of the amplifying circuit is electrically connected with the A/D conversion port of the processor.
7. The interference immunity zinc oxide arrester monitoring device of claim 1, wherein: the temperature and humidity sensor is electrically connected with the I/O port of the processor.
8. The interference immunity zinc oxide arrester monitoring device of claim 1, wherein: the printer also comprises a display and a printer which are respectively electrically connected with the processor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921043359.1U CN210514479U (en) | 2019-07-05 | 2019-07-05 | Anti-interference zinc oxide arrester monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921043359.1U CN210514479U (en) | 2019-07-05 | 2019-07-05 | Anti-interference zinc oxide arrester monitoring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210514479U true CN210514479U (en) | 2020-05-12 |
Family
ID=70581457
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921043359.1U Active CN210514479U (en) | 2019-07-05 | 2019-07-05 | Anti-interference zinc oxide arrester monitoring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210514479U (en) |
-
2019
- 2019-07-05 CN CN201921043359.1U patent/CN210514479U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109946506B (en) | Zero crossing detection system | |
| CN103368524A (en) | Signal conditioning circuit for remote monitoring system of distribution transformer | |
| CN210514479U (en) | Anti-interference zinc oxide arrester monitoring device | |
| CN209627339U (en) | A kind of noise suppression circuit and the test circuit including the noise suppression circuit | |
| CN202182911U (en) | Automatic gain regulating current detection circuit of low voltage soft starter | |
| CN209070002U (en) | A kind of high-precision bidirectional DC voltage isolation Acquisition Circuit | |
| CN215003927U (en) | Noise signal sensing device based on intelligent distribution transformation visual management and control platform | |
| CN202586351U (en) | Suppression device for power frequency interference signal of power transmission line | |
| CN202794285U (en) | Isolation processing circuit for small analog alternating current (AC) or direct current (DC) signals | |
| CN205786850U (en) | A kind of mains by harmonics signals collecting pretreatment circuit | |
| CN210514514U (en) | Small signal acquisition circuit applied to power distribution terminal | |
| CN205691660U (en) | A kind of power input to a machine counting circuit | |
| CN201535797U (en) | Isolation detection circuit for main loop current of induction cooker | |
| CN204559542U (en) | A kind of current-to-voltage converting circuit with inputting biased and active power filtering | |
| CN210514584U (en) | Zinc oxide arrester live-line tester | |
| CN210514359U (en) | Sensing detection circuit based on ultrasonic measurement wind speed and wind direction | |
| CN209281373U (en) | Direct current biasing for human body Collection equipment eliminates circuit | |
| CN210863874U (en) | Sampling circuit of contact isolation type ion generating device | |
| CN107192896A (en) | Measurement apparatus for High voltage power frequence electric field | |
| CN209625075U (en) | A kind of signal conditioning circuit applied to arrester circuit | |
| CN214750560U (en) | Transformer short-circuit impedance live detection device | |
| CN111736023A (en) | Big data information transmission system | |
| CN203275917U (en) | Signal conditioner of distribution transformer remote monitoring system | |
| CN205178466U (en) | Three -phase alternating current flows hardware overcurrent protect device | |
| CN109831181A (en) | A kind of noise suppression circuit and the test circuit including the noise suppression circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |