CN210514584U - Zinc oxide arrester live-line tester - Google Patents
Zinc oxide arrester live-line tester Download PDFInfo
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- CN210514584U CN210514584U CN201921044038.3U CN201921044038U CN210514584U CN 210514584 U CN210514584 U CN 210514584U CN 201921044038 U CN201921044038 U CN 201921044038U CN 210514584 U CN210514584 U CN 210514584U
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- oxide arrester
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Abstract
The utility model provides a zinc oxide arrester live tester, through setting up instrumentation amplifier, on the one hand can carry out amplification treatment to current signal, can also filter the common mode interference in the current signal, and its magnification is adjustable, can be applicable to multiple application scene, and can filter most common mode interference; by arranging the protection circuit, the rear-stage circuit can be prevented from being burnt out by the impact of large current on the cable, and complete electrical isolation is realized, so that the safety and reliability are realized; by arranging the high-energy lithium ion battery, the lithium ion battery can be suitable for occasions without power supplies, and the application scene of the lithium ion battery is expanded.
Description
Technical Field
The utility model relates to an arrester detection area especially relates to a zinc oxide arrester live tester.
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. From the eighties of the last century, Metal Oxide Arresters (MOAs) gradually replaced SiC arresters, and due to the good volt-ampere characteristics of the metal oxide arresters, the protection level of main equipment in power production has a qualitative leap. With the popularization of MOA, the operation state of the MOA is more and more emphasized by the industry. If a zinc oxide arrester in an electric power system is aged, moistened or fails, electric power equipment can be damaged and even large faults are caused, a main test item of the zinc oxide arrester is resistive current, the conventional test method is regular maintenance, and the arrester cannot be fed back immediately and maintained in time when in problem due to maintenance time intervals. The existing arrester tester can not perform testing at any time or has large testing error, even if some instruments can perform live-line measurement, the measurement is performed when the instruments are mostly overhauled, and the change condition of the leakage current of the arrester can not be reflected in time. Current mainstream arrester tester full current measurement range is mostly 100 mu A ~ 10mA, and it is low to current sensitivity, consequently, for solving above-mentioned problem, the utility model provides a zinc oxide arrester live tester, its sensitivity that detects leakage current is high to built-in high energy lithium ion battery is fit for the no power occasion.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides an electrified tester of zinc oxide arrester, its sensitivity that detects leakage current is high to built-in high energy lithium ion battery is fit for the no power occasion.
The technical scheme of the utility model is realized like this: the utility model provides a zinc oxide arrester live tester, which comprises a power circuit, a voltage acquisition circuit, a current acquisition circuit, a wireless communication circuit and a processor with a built-in A/D converter, wherein the current acquisition circuit comprises a current transformer, an instrument amplifier and a protection circuit which are electrically connected in sequence;
the power supply circuit is respectively and electrically connected with the current transformer, the instrument amplifier, the voltage acquisition circuit and the processor, the voltage acquisition circuit is electrically connected with an A/D port of the processor, the wireless communication circuit is electrically connected with a communication port of the processor, and the output end of the protection circuit is electrically connected with the other A/D port of the processor.
On the basis of the technical scheme, the lithium ion battery also comprises a high-energy lithium ion battery;
the high-energy lithium ion battery is electrically connected with the current transformer, the instrument amplifier, the voltage acquisition circuit and the processor respectively.
Further preferably, the current transformer comprises a transformer T1, a voltage dependent resistor VR2 and a potentiometer W1;
the two ends of the voltage dependent resistor VR2 are respectively electrically connected with the two ends of the zinc oxide arrester in a one-to-one correspondence manner, the two input ends on the primary side of the mutual inductor T1 are respectively electrically connected with the two ends of the zinc oxide arrester in a one-to-one correspondence manner, the two input ends on the secondary side of the mutual inductor T1 are respectively electrically connected with the two wiring terminals of the potentiometer W1 in a one-to-one correspondence manner, and the two wiring terminals of the potentiometer W1 are respectively electrically connected with the differential input end of the instrument method device in.
Further preferably, the instrumentation amplifier comprises an amplifier AD620 and a potentiometer W3;
two connection terminals of the potentiometer W1 are electrically connected to the 2 nd pin and the 3 rd pin of the amplifier AD620 in a one-to-one correspondence manner, respectively, the 1 st pin of the amplifier AD620 is electrically connected to the 8 th pin of the amplifier AD620 through the potentiometer W4, and the 6 th pin of the amplifier AD620 is electrically connected to the input terminal of the protection circuit.
Further preferably, the protection circuit comprises a polarity capacitor C36, a capacitor C42, a diode D3, a voltage regulator tube Z2 and a resistor R26;
the 6 th pin of the amplifier AD620 is electrically connected with one end of a resistor R26, the cathode of a diode D3 and the cathode of a voltage regulator tube Z2 respectively, the other end of the resistor R26 is electrically connected with one end of a capacitor C42 and the A/D port of the processor respectively, the anode of a diode D3, the anode of the voltage regulator tube Z2 and the other end of the capacitor C42 are electrically connected with the cathode of a polar capacitor C36 respectively, and the anode of the polar capacitor C36 is electrically connected with the 4 th pin of the amplifier AD 620.
Further preferably, the processor is a dsPIC30F6015 chip;
the AN1 pin of the dsPIC30F6015 chip is electrically connected to the 6 th pin of the amplifier AD620 through a resistor R26.
On the basis of the above technical scheme, preferably, the voltage acquisition circuit comprises a voltage transformer, an amplifier and a filter which are electrically connected in sequence;
the output end of the filter is electrically connected with the 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 electrified tester of zinc oxide arrester has following beneficial effect for prior art:
(1) by arranging the instrument amplifier, on one hand, the current signal can be amplified, common mode interference in the current signal can be filtered, the amplification factor is adjustable, the instrument amplifier is suitable for various application scenes, and most common mode interference can be filtered;
(2) by arranging the protection circuit, the rear-stage circuit can be prevented from being burnt out by the impact of large current on the cable, and complete electrical isolation is realized, so that the safety and reliability are realized;
(3) by arranging the high-energy lithium ion battery, the lithium ion battery can be suitable for occasions without power supplies, and the application scene of the lithium ion battery is expanded.
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 zinc oxide arrester live tester of the present invention;
fig. 2 is a circuit diagram of a current collecting circuit in the zinc oxide arrester live tester 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 electrified tester of zinc oxide arrester, it includes power supply circuit, voltage acquisition circuit, current acquisition circuit, wireless communication circuit and the treater of built-in AD converter, current transformer, instrumentation amplifier, voltage acquisition circuit and treater electric connection, voltage acquisition circuit, current acquisition circuit respectively with the AD conversion mouth one-to-one electric connection of treater, the communication mouth electric connection of wireless communication circuit and treater. Since the lightning arrester usually uses three-phase power, three voltage and current acquisition circuits with the same structure are needed, and the structure of each voltage and current acquisition circuit is the same, so that only one of the voltage and current acquisition circuits is described herein.
In this embodiment, the current collecting circuit includes a current transformer, an instrumentation amplifier and a protection circuit electrically connected in sequence, and an output terminal of the protection circuit is electrically connected with an a/D port of the processor. The current transformer collects leakage current at two ends of the zinc oxide arrester, the instrument amplifier eliminates common-mode interference components in the leakage current and amplifies the leakage current, and the protection circuit comprises a voltage damage post-stage circuit output by the instrument amplifier. The specific circuit structure is as follows:
in the present embodiment, as shown in fig. 2, the current transformer includes a transformer T1, a varistor VR2, and a potentiometer W1; specifically, two ends of the voltage dependent resistor VR2 are electrically connected with two ends of the zinc oxide arrester in a one-to-one correspondence manner, two input ends on a primary side of the transformer T1 are electrically connected with two ends of the zinc oxide arrester in a one-to-one correspondence manner, two input ends on a secondary side of the transformer T1 are electrically connected with two wiring terminals of the potentiometer W1 in a one-to-one correspondence manner, and two wiring terminals of the potentiometer W1 are electrically connected with a differential input end of the instrument method device in a one-to-one correspondence manner. In the embodiment, the mutual inductor T1 adopts a small current mutual inductor with the model of KT0.02A/PJ-1.6V, can measure alternating current with the frequency of 25-50 KHz and the amplitude of 0-20 mA, outputs an alternating current signal with the amplitude of 0-100 mA, has the measurement precision of 0.5-1%, and has small signal distortion. When the current signal is adopted by the transformer T1, the current signal output by the secondary side of the transformer T1 is converted into a voltage signal by the potentiometer W1, and the voltage dependent resistor VR2 is used for suppressing an impact current and preventing a large current from burning out a post-stage circuit.
In the present embodiment, as shown, the instrumentation amplifier includes an amplifier AD620 and a potentiometer W3; specifically, two connection terminals of the potentiometer W1 are electrically connected to the 2 nd pin and the 3 rd pin of the amplifier AD620 in a one-to-one correspondence manner, the 1 st pin of the amplifier AD620 is electrically connected to the 8 th pin of the amplifier AD620 through the potentiometer W4, and the 6 th pin of the amplifier AD620 is electrically connected to the input terminal of the protection circuit. The amplifier AD620 has 8 external pins, wherein the 7 th pin and the 4 th pin are respectively connected to the positive and negative power supply electrodes, the potentiometer W4 is connected between the 1 st pin and the 8 th pin for adjusting the amplification gain, and the 5 th pin is a reference voltage input pin for adjusting the output zero point, which is adjusted by the potentiometer W3 in this embodiment.
In this embodiment, as shown in fig. 2, the protection circuit includes a polar capacitor C36, a capacitor C42, a diode D3, a voltage regulator tube Z2, and a resistor R26; specifically, the 6 th pin of the amplifier AD620 is electrically connected to one end of the resistor R26, the cathode of the diode D3, and the cathode of the voltage regulator tube Z2, the other end of the resistor R26 is electrically connected to one end of the capacitor C42 and the a/D port of the processor, the anode of the diode D3, the anode of the voltage regulator tube Z2, and the other end of the capacitor C42 are electrically connected to the cathode of the polarity capacitor C36, and the anode of the polarity capacitor C36 is electrically connected to the 4 th pin of the amplifier AD 620. The diode D3 and the stabilivolt Z2 constitute a clamping protection circuit to prevent the high current from burning out the post-stage circuit, and the resistor R26 and the capacitor C42 constitute a filter circuit to filter interference signals.
In this embodiment, the processor is a dsPIC30F6015 chip; the AN1 pin of the dsPIC30F6015 chip is electrically connected to the 6 th pin of the amplifier AD620 through a resistor R26.
And the voltage acquisition circuit acquires the voltage on the zinc oxide arrester and filters and amplifies the acquired signal. In this embodiment, the voltage acquisition circuit includes a voltage transformer, an amplifier, and a filter electrically connected in sequence; the output end of the filter is electrically connected with the A/D conversion port of the processor. Since the present embodiment does not relate to the improvement of the voltage acquisition circuit, and the voltage acquisition circuit is common knowledge in the art, the description thereof will not be repeated here.
The power supply circuit converts the mains supply into the voltage which can be used by the voltage acquisition circuit, the current acquisition circuit, the wireless communication circuit and the processor, and the power supply circuit is designed when being designed and belongs to common knowledge in the field and can be realized by the prior art, so that the description is omitted. In this embodiment, the power supply device further comprises a high-energy lithium ion battery, the high-energy lithium ion battery is electrically connected with the current transformer, the instrument amplifier, the voltage acquisition circuit and the processor respectively, the high-energy lithium ion battery has high current rate and excellent restarting performance, provides pulse current, is reliable in performance, wide in application temperature range, is suitable for occasions with different current rate requirements, and can be used in occasions without power supplies.
The temperature and humidity sensor is electrically connected with the I/O port of the processor, and the display and the printer are electrically connected with the processor.
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 (9)
1. The utility model provides an electrified tester of zinc oxide arrester, its includes power supply circuit, voltage acquisition circuit, current acquisition circuit, wireless communication circuit and the treater of built-in AD converter, its characterized in that: the current acquisition circuit comprises a current transformer, an instrument amplifier and a protection circuit which are electrically connected in sequence;
the power supply circuit is respectively and electrically connected with the current transformer, the instrument amplifier, the voltage acquisition circuit and the processor, the voltage acquisition circuit is electrically connected with an A/D port of the processor, the wireless communication circuit is electrically connected with a communication port of the processor, and the output end of the protection circuit is electrically connected with another A/D port of the processor.
2. The electrification tester for the zinc oxide arrester of claim 1, characterized in that: the lithium ion battery also comprises a high-energy lithium ion battery;
the high-energy lithium ion battery is electrically connected with the current transformer, the instrument amplifier, the voltage acquisition circuit and the processor respectively.
3. The electrification tester for the zinc oxide arrester of claim 2, characterized in that: the current transformer comprises a transformer T1, a voltage dependent resistor VR2 and a potentiometer W1;
the two ends of the piezoresistor VR2 are respectively electrically connected with the two ends of the zinc oxide arrester in a one-to-one correspondence manner, the two input ends on the primary side of the mutual inductor T1 are respectively electrically connected with the two ends of the zinc oxide arrester in a one-to-one correspondence manner, the two input ends on the secondary side of the mutual inductor T1 are respectively electrically connected with the two wiring terminals of the potentiometer W1 in a one-to-one correspondence manner, and the two wiring terminals of the potentiometer W1 are respectively electrically connected with the differential input end of the instrument method device in a one.
4. The electrification tester for the zinc oxide arrester of claim 3, characterized in that: the instrumentation amplifier comprises an amplifier AD620 and a potentiometer W3;
two connection terminals of the potentiometer W1 are respectively electrically connected with the 2 nd pin and the 3 rd pin of the amplifier AD620 in a one-to-one correspondence manner, the 1 st pin of the amplifier AD620 is electrically connected with the 8 th pin of the amplifier AD620 through the potentiometer W4, and the 6 th pin of the amplifier AD620 is electrically connected with the input end of the protection circuit.
5. The electrification tester for the zinc oxide arrester of claim 4, characterized in that: the protection circuit comprises a polar capacitor C36, a capacitor C42, a diode D3, a voltage regulator tube Z2 and a resistor R26;
the 6 th pin of the amplifier AD620 is electrically connected with one end of a resistor R26, the cathode of a diode D3 and the cathode of a voltage regulator tube Z2 respectively, the other end of the resistor R26 is electrically connected with one end of a capacitor C42 and the A/D port of the processor respectively, the anode of a diode D3, the anode of a voltage regulator tube Z2 and the other end of a capacitor C42 are electrically connected with the cathode of a polar capacitor C36 respectively, and the anode of a polar capacitor C36 is electrically connected with the 4 th pin of the amplifier AD 620.
6. The electrification tester for the zinc oxide arrester of claim 5, characterized in that: the processor is a dsPIC30F6015 chip;
the AN1 pin of the dsPIC30F6015 chip is electrically connected to the 6 th pin of the amplifier AD620 through a resistor R26.
7. The electrification tester for the zinc oxide arrester of claim 1, characterized in that: the voltage acquisition circuit comprises a voltage transformer, an amplifier and a filter which are electrically connected in sequence;
the output end of the filter is electrically connected with the A/D conversion port of the processor.
8. The electrification tester for the zinc oxide arrester of claim 1, characterized in that: the temperature and humidity sensor is electrically connected with the I/O port of the processor.
9. The electrification tester for the zinc oxide arrester of claim 1, characterized in that: 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 |
|---|---|---|---|
| CN201921044038.3U CN210514584U (en) | 2019-07-05 | 2019-07-05 | Zinc oxide arrester live-line tester |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921044038.3U CN210514584U (en) | 2019-07-05 | 2019-07-05 | Zinc oxide arrester live-line tester |
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| CN210514584U true CN210514584U (en) | 2020-05-12 |
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| CN201921044038.3U Active CN210514584U (en) | 2019-07-05 | 2019-07-05 | Zinc oxide arrester live-line tester |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112816806A (en) * | 2020-08-28 | 2021-05-18 | 苏州灵成电气有限公司 | Zinc oxide arrester test system and calibration method |
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- 2019-07-05 CN CN201921044038.3U patent/CN210514584U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112816806A (en) * | 2020-08-28 | 2021-05-18 | 苏州灵成电气有限公司 | Zinc oxide arrester test system and calibration method |
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